/* * Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved. * Copyright (c) 2016, 2024 SAP SE. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "asm/macroAssembler.inline.hpp" #include "code/debugInfoRec.hpp" #include "code/vtableStubs.hpp" #include "code/compiledIC.hpp" #include "compiler/oopMap.hpp" #include "gc/shared/barrierSetAssembler.hpp" #include "gc/shared/gcLocker.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/interp_masm.hpp" #include "memory/resourceArea.hpp" #include "nativeInst_s390.hpp" #include "oops/klass.inline.hpp" #include "prims/methodHandles.hpp" #include "registerSaver_s390.hpp" #include "runtime/jniHandles.hpp" #include "runtime/safepointMechanism.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/signature.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/timerTrace.hpp" #include "runtime/vframeArray.hpp" #include "utilities/align.hpp" #include "utilities/macros.hpp" #include "vmreg_s390.inline.hpp" #ifdef COMPILER1 #include "c1/c1_Runtime1.hpp" #endif #ifdef COMPILER2 #include "opto/ad.hpp" #include "opto/runtime.hpp" #endif #ifdef PRODUCT #define __ masm-> #else #define __ (Verbose ? (masm->block_comment(FILE_AND_LINE),masm):masm)-> #endif #define BLOCK_COMMENT(str) __ block_comment(str) #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") #define RegisterSaver_LiveIntReg(regname) \ { RegisterSaver::int_reg, regname->encoding(), regname->as_VMReg() } #define RegisterSaver_LiveFloatReg(regname) \ { RegisterSaver::float_reg, regname->encoding(), regname->as_VMReg() } // Registers which are not saved/restored, but still they have got a frame slot. // Used to get same frame size for RegisterSaver_LiveRegs and RegisterSaver_LiveRegsWithoutR2 #define RegisterSaver_ExcludedIntReg(regname) \ { RegisterSaver::excluded_reg, regname->encoding(), regname->as_VMReg() } // Registers which are not saved/restored, but still they have got a frame slot. // Used to get same frame size for RegisterSaver_LiveRegs and RegisterSaver_LiveRegsWithoutR2. #define RegisterSaver_ExcludedFloatReg(regname) \ { RegisterSaver::excluded_reg, regname->encoding(), regname->as_VMReg() } #define RegisterSaver_LiveVReg(regname) \ { RegisterSaver::v_reg, regname->encoding(), regname->as_VMReg() } static const RegisterSaver::LiveRegType RegisterSaver_LiveRegs[] = { // Live registers which get spilled to the stack. Register positions // in this array correspond directly to the stack layout. // // live float registers: // RegisterSaver_LiveFloatReg(Z_F0 ), // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1) RegisterSaver_LiveFloatReg(Z_F2 ), RegisterSaver_LiveFloatReg(Z_F3 ), RegisterSaver_LiveFloatReg(Z_F4 ), RegisterSaver_LiveFloatReg(Z_F5 ), RegisterSaver_LiveFloatReg(Z_F6 ), RegisterSaver_LiveFloatReg(Z_F7 ), RegisterSaver_LiveFloatReg(Z_F8 ), RegisterSaver_LiveFloatReg(Z_F9 ), RegisterSaver_LiveFloatReg(Z_F10), RegisterSaver_LiveFloatReg(Z_F11), RegisterSaver_LiveFloatReg(Z_F12), RegisterSaver_LiveFloatReg(Z_F13), RegisterSaver_LiveFloatReg(Z_F14), RegisterSaver_LiveFloatReg(Z_F15), // // RegisterSaver_ExcludedIntReg(Z_R0), // scratch // RegisterSaver_ExcludedIntReg(Z_R1), // scratch RegisterSaver_LiveIntReg(Z_R2 ), RegisterSaver_LiveIntReg(Z_R3 ), RegisterSaver_LiveIntReg(Z_R4 ), RegisterSaver_LiveIntReg(Z_R5 ), RegisterSaver_LiveIntReg(Z_R6 ), RegisterSaver_LiveIntReg(Z_R7 ), RegisterSaver_LiveIntReg(Z_R8 ), RegisterSaver_LiveIntReg(Z_R9 ), RegisterSaver_LiveIntReg(Z_R10), RegisterSaver_LiveIntReg(Z_R11), RegisterSaver_LiveIntReg(Z_R12), RegisterSaver_LiveIntReg(Z_R13), // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.) // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer }; static const RegisterSaver::LiveRegType RegisterSaver_LiveIntRegs[] = { // Live registers which get spilled to the stack. Register positions // in this array correspond directly to the stack layout. // // live float registers: All excluded, but still they get a stack slot to get same frame size. // RegisterSaver_ExcludedFloatReg(Z_F0 ), // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1) RegisterSaver_ExcludedFloatReg(Z_F2 ), RegisterSaver_ExcludedFloatReg(Z_F3 ), RegisterSaver_ExcludedFloatReg(Z_F4 ), RegisterSaver_ExcludedFloatReg(Z_F5 ), RegisterSaver_ExcludedFloatReg(Z_F6 ), RegisterSaver_ExcludedFloatReg(Z_F7 ), RegisterSaver_ExcludedFloatReg(Z_F8 ), RegisterSaver_ExcludedFloatReg(Z_F9 ), RegisterSaver_ExcludedFloatReg(Z_F10), RegisterSaver_ExcludedFloatReg(Z_F11), RegisterSaver_ExcludedFloatReg(Z_F12), RegisterSaver_ExcludedFloatReg(Z_F13), RegisterSaver_ExcludedFloatReg(Z_F14), RegisterSaver_ExcludedFloatReg(Z_F15), // // RegisterSaver_ExcludedIntReg(Z_R0), // scratch // RegisterSaver_ExcludedIntReg(Z_R1), // scratch RegisterSaver_LiveIntReg(Z_R2 ), RegisterSaver_LiveIntReg(Z_R3 ), RegisterSaver_LiveIntReg(Z_R4 ), RegisterSaver_LiveIntReg(Z_R5 ), RegisterSaver_LiveIntReg(Z_R6 ), RegisterSaver_LiveIntReg(Z_R7 ), RegisterSaver_LiveIntReg(Z_R8 ), RegisterSaver_LiveIntReg(Z_R9 ), RegisterSaver_LiveIntReg(Z_R10), RegisterSaver_LiveIntReg(Z_R11), RegisterSaver_LiveIntReg(Z_R12), RegisterSaver_LiveIntReg(Z_R13), // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.) // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer }; static const RegisterSaver::LiveRegType RegisterSaver_LiveRegsWithoutR2[] = { // Live registers which get spilled to the stack. Register positions // in this array correspond directly to the stack layout. // // live float registers: // RegisterSaver_LiveFloatReg(Z_F0 ), // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1) RegisterSaver_LiveFloatReg(Z_F2 ), RegisterSaver_LiveFloatReg(Z_F3 ), RegisterSaver_LiveFloatReg(Z_F4 ), RegisterSaver_LiveFloatReg(Z_F5 ), RegisterSaver_LiveFloatReg(Z_F6 ), RegisterSaver_LiveFloatReg(Z_F7 ), RegisterSaver_LiveFloatReg(Z_F8 ), RegisterSaver_LiveFloatReg(Z_F9 ), RegisterSaver_LiveFloatReg(Z_F10), RegisterSaver_LiveFloatReg(Z_F11), RegisterSaver_LiveFloatReg(Z_F12), RegisterSaver_LiveFloatReg(Z_F13), RegisterSaver_LiveFloatReg(Z_F14), RegisterSaver_LiveFloatReg(Z_F15), // // RegisterSaver_ExcludedIntReg(Z_R0), // scratch // RegisterSaver_ExcludedIntReg(Z_R1), // scratch RegisterSaver_ExcludedIntReg(Z_R2), // Omit saving R2. RegisterSaver_LiveIntReg(Z_R3 ), RegisterSaver_LiveIntReg(Z_R4 ), RegisterSaver_LiveIntReg(Z_R5 ), RegisterSaver_LiveIntReg(Z_R6 ), RegisterSaver_LiveIntReg(Z_R7 ), RegisterSaver_LiveIntReg(Z_R8 ), RegisterSaver_LiveIntReg(Z_R9 ), RegisterSaver_LiveIntReg(Z_R10), RegisterSaver_LiveIntReg(Z_R11), RegisterSaver_LiveIntReg(Z_R12), RegisterSaver_LiveIntReg(Z_R13), // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.) // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer }; // Live argument registers which get spilled to the stack. static const RegisterSaver::LiveRegType RegisterSaver_LiveArgRegs[] = { RegisterSaver_LiveFloatReg(Z_FARG1), RegisterSaver_LiveFloatReg(Z_FARG2), RegisterSaver_LiveFloatReg(Z_FARG3), RegisterSaver_LiveFloatReg(Z_FARG4), RegisterSaver_LiveIntReg(Z_ARG1), RegisterSaver_LiveIntReg(Z_ARG2), RegisterSaver_LiveIntReg(Z_ARG3), RegisterSaver_LiveIntReg(Z_ARG4), RegisterSaver_LiveIntReg(Z_ARG5) }; static const RegisterSaver::LiveRegType RegisterSaver_LiveVolatileRegs[] = { // Live registers which get spilled to the stack. Register positions // in this array correspond directly to the stack layout. // // live float registers: // RegisterSaver_LiveFloatReg(Z_F0 ), // RegisterSaver_ExcludedFloatReg(Z_F1 ), // scratch (Z_fscratch_1) RegisterSaver_LiveFloatReg(Z_F2 ), RegisterSaver_LiveFloatReg(Z_F3 ), RegisterSaver_LiveFloatReg(Z_F4 ), RegisterSaver_LiveFloatReg(Z_F5 ), RegisterSaver_LiveFloatReg(Z_F6 ), RegisterSaver_LiveFloatReg(Z_F7 ), // RegisterSaver_LiveFloatReg(Z_F8 ), // non-volatile // RegisterSaver_LiveFloatReg(Z_F9 ), // non-volatile // RegisterSaver_LiveFloatReg(Z_F10), // non-volatile // RegisterSaver_LiveFloatReg(Z_F11), // non-volatile // RegisterSaver_LiveFloatReg(Z_F12), // non-volatile // RegisterSaver_LiveFloatReg(Z_F13), // non-volatile // RegisterSaver_LiveFloatReg(Z_F14), // non-volatile // RegisterSaver_LiveFloatReg(Z_F15), // non-volatile // // RegisterSaver_ExcludedIntReg(Z_R0), // scratch // RegisterSaver_ExcludedIntReg(Z_R1), // scratch RegisterSaver_LiveIntReg(Z_R2 ), RegisterSaver_LiveIntReg(Z_R3 ), RegisterSaver_LiveIntReg(Z_R4 ), RegisterSaver_LiveIntReg(Z_R5 ), // RegisterSaver_LiveIntReg(Z_R6 ), // non-volatile // RegisterSaver_LiveIntReg(Z_R7 ), // non-volatile // RegisterSaver_LiveIntReg(Z_R8 ), // non-volatile // RegisterSaver_LiveIntReg(Z_R9 ), // non-volatile // RegisterSaver_LiveIntReg(Z_R10), // non-volatile // RegisterSaver_LiveIntReg(Z_R11), // non-volatile // RegisterSaver_LiveIntReg(Z_R12), // non-volatile // RegisterSaver_LiveIntReg(Z_R13), // non-volatile // RegisterSaver_ExcludedIntReg(Z_R14), // return pc (Saved in caller frame.) // RegisterSaver_ExcludedIntReg(Z_R15) // stack pointer }; static const RegisterSaver::LiveRegType RegisterSaver_LiveVRegs[] = { // live vector registers (optional, only these are used by C2): RegisterSaver_LiveVReg( Z_V16 ), RegisterSaver_LiveVReg( Z_V17 ), RegisterSaver_LiveVReg( Z_V18 ), RegisterSaver_LiveVReg( Z_V19 ), RegisterSaver_LiveVReg( Z_V20 ), RegisterSaver_LiveVReg( Z_V21 ), RegisterSaver_LiveVReg( Z_V22 ), RegisterSaver_LiveVReg( Z_V23 ), RegisterSaver_LiveVReg( Z_V24 ), RegisterSaver_LiveVReg( Z_V25 ), RegisterSaver_LiveVReg( Z_V26 ), RegisterSaver_LiveVReg( Z_V27 ), RegisterSaver_LiveVReg( Z_V28 ), RegisterSaver_LiveVReg( Z_V29 ), RegisterSaver_LiveVReg( Z_V30 ), RegisterSaver_LiveVReg( Z_V31 ) }; int RegisterSaver::live_reg_save_size(RegisterSet reg_set) { int reg_space = -1; switch (reg_set) { case all_registers: reg_space = sizeof(RegisterSaver_LiveRegs); break; case all_registers_except_r2: reg_space = sizeof(RegisterSaver_LiveRegsWithoutR2); break; case all_integer_registers: reg_space = sizeof(RegisterSaver_LiveIntRegs); break; case all_volatile_registers: reg_space = sizeof(RegisterSaver_LiveVolatileRegs); break; case arg_registers: reg_space = sizeof(RegisterSaver_LiveArgRegs); break; default: ShouldNotReachHere(); } return (reg_space / sizeof(RegisterSaver::LiveRegType)) * reg_size; } int RegisterSaver::calculate_vregstosave_num() { return (sizeof(RegisterSaver_LiveVRegs) / sizeof(RegisterSaver::LiveRegType)); } int RegisterSaver::live_reg_frame_size(RegisterSet reg_set, bool save_vectors) { const int vregstosave_num = save_vectors ? calculate_vregstosave_num() : 0; return live_reg_save_size(reg_set) + vregstosave_num * v_reg_size + frame::z_abi_160_size; } // return_pc: Specify the register that should be stored as the return pc in the current frame. OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, RegisterSet reg_set, Register return_pc, bool save_vectors) { // Record volatile registers as callee-save values in an OopMap so // their save locations will be propagated to the caller frame's // RegisterMap during StackFrameStream construction (needed for // deoptimization; see compiledVFrame::create_stack_value). // Calculate frame size. const int frame_size_in_bytes = live_reg_frame_size(reg_set, save_vectors); const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); const int vregstosave_num = save_vectors ? calculate_vregstosave_num() : 0; const int register_save_offset = frame_size_in_bytes - (live_reg_save_size(reg_set) + vregstosave_num * v_reg_size); // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words. OopMap* map = new OopMap(frame_size_in_slots, 0); int regstosave_num = 0; const RegisterSaver::LiveRegType* live_regs = nullptr; switch (reg_set) { case all_registers: regstosave_num = sizeof(RegisterSaver_LiveRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveRegs; break; case all_registers_except_r2: regstosave_num = sizeof(RegisterSaver_LiveRegsWithoutR2)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveRegsWithoutR2; break; case all_integer_registers: regstosave_num = sizeof(RegisterSaver_LiveIntRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveIntRegs; break; case all_volatile_registers: regstosave_num = sizeof(RegisterSaver_LiveVolatileRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveVolatileRegs; break; case arg_registers: regstosave_num = sizeof(RegisterSaver_LiveArgRegs)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveArgRegs; break; default: ShouldNotReachHere(); } // Save return pc in old frame. __ save_return_pc(return_pc); // Push a new frame (includes stack linkage). // Use return_pc as scratch for push_frame. Z_R0_scratch (the default) and Z_R1_scratch are // illegally used to pass parameters by RangeCheckStub::emit_code(). __ push_frame(frame_size_in_bytes, return_pc); // We have to restore return_pc right away. // Nobody else will. Furthermore, return_pc isn't necessarily the default (Z_R14). // Nobody else knows which register we saved. __ z_lg(return_pc, _z_common_abi(return_pc) + frame_size_in_bytes, Z_SP); // Register save area in new frame starts above z_abi_160 area. int offset = register_save_offset; Register first = noreg; Register last = noreg; int first_offset = -1; bool float_spilled = false; for (int i = 0; i < regstosave_num; i++, offset += reg_size) { int reg_num = live_regs[i].reg_num; int reg_type = live_regs[i].reg_type; switch (reg_type) { case RegisterSaver::int_reg: { Register reg = as_Register(reg_num); if (last != reg->predecessor()) { if (first != noreg) { __ z_stmg(first, last, first_offset, Z_SP); } first = reg; first_offset = offset; DEBUG_ONLY(float_spilled = false); } last = reg; assert(last != Z_R0, "r0 would require special treatment"); assert(!float_spilled, "for simplicity, do not mix up ints and floats in RegisterSaver_LiveRegs[]"); break; } case RegisterSaver::excluded_reg: // Not saved/restored, but with dedicated slot. continue; // Continue with next loop iteration. case RegisterSaver::float_reg: { FloatRegister freg = as_FloatRegister(reg_num); __ z_std(freg, offset, Z_SP); DEBUG_ONLY(float_spilled = true); break; } default: ShouldNotReachHere(); break; } // Second set_callee_saved is really a waste but we'll keep things as they were for now map->set_callee_saved(VMRegImpl::stack2reg(offset >> 2), live_regs[i].vmreg); map->set_callee_saved(VMRegImpl::stack2reg((offset + half_reg_size) >> 2), live_regs[i].vmreg->next()); } assert(first != noreg, "Should spill at least one int reg."); __ z_stmg(first, last, first_offset, Z_SP); for (int i = 0; i < vregstosave_num; i++, offset += v_reg_size) { int reg_num = RegisterSaver_LiveVRegs[i].reg_num; __ z_vst(as_VectorRegister(reg_num), Address(Z_SP, offset)); map->set_callee_saved(VMRegImpl::stack2reg(offset>>2), RegisterSaver_LiveVRegs[i].vmreg); map->set_callee_saved(VMRegImpl::stack2reg((offset + half_reg_size ) >> 2), RegisterSaver_LiveVRegs[i].vmreg->next()); map->set_callee_saved(VMRegImpl::stack2reg((offset + (half_reg_size * 2)) >> 2), RegisterSaver_LiveVRegs[i].vmreg->next(2)); map->set_callee_saved(VMRegImpl::stack2reg((offset + (half_reg_size * 3)) >> 2), RegisterSaver_LiveVRegs[i].vmreg->next(3)); } assert(offset == frame_size_in_bytes, "consistency check"); // And we're done. return map; } // Generate the OopMap (again, regs where saved before). OopMap* RegisterSaver::generate_oop_map(MacroAssembler* masm, RegisterSet reg_set) { // Calculate frame size. const int frame_size_in_bytes = live_reg_frame_size(reg_set); const int frame_size_in_slots = frame_size_in_bytes / sizeof(jint); const int register_save_offset = frame_size_in_bytes - live_reg_save_size(reg_set); // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words. OopMap* map = new OopMap(frame_size_in_slots, 0); int regstosave_num = 0; const RegisterSaver::LiveRegType* live_regs = nullptr; switch (reg_set) { case all_registers: regstosave_num = sizeof(RegisterSaver_LiveRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveRegs; break; case all_registers_except_r2: regstosave_num = sizeof(RegisterSaver_LiveRegsWithoutR2)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveRegsWithoutR2; break; case all_integer_registers: regstosave_num = sizeof(RegisterSaver_LiveIntRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveIntRegs; break; case all_volatile_registers: regstosave_num = sizeof(RegisterSaver_LiveVolatileRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveVolatileRegs; break; case arg_registers: regstosave_num = sizeof(RegisterSaver_LiveArgRegs)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveArgRegs; break; default: ShouldNotReachHere(); } // Register save area in new frame starts above z_abi_160 area. int offset = register_save_offset; for (int i = 0; i < regstosave_num; i++) { if (live_regs[i].reg_type < RegisterSaver::excluded_reg) { map->set_callee_saved(VMRegImpl::stack2reg(offset>>2), live_regs[i].vmreg); map->set_callee_saved(VMRegImpl::stack2reg((offset + half_reg_size)>>2), live_regs[i].vmreg->next()); } offset += reg_size; } #ifdef ASSERT assert(offset == frame_size_in_bytes, "consistency check"); #endif return map; } // Pop the current frame and restore all the registers that we saved. void RegisterSaver::restore_live_registers(MacroAssembler* masm, RegisterSet reg_set, bool save_vectors) { int offset; const int vregstosave_num = save_vectors ? calculate_vregstosave_num() : 0; const int register_save_offset = live_reg_frame_size(reg_set, save_vectors) - (live_reg_save_size(reg_set) + vregstosave_num * v_reg_size); Register first = noreg; Register last = noreg; int first_offset = -1; bool float_spilled = false; int regstosave_num = 0; const RegisterSaver::LiveRegType* live_regs = nullptr; switch (reg_set) { case all_registers: regstosave_num = sizeof(RegisterSaver_LiveRegs)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveRegs; break; case all_registers_except_r2: regstosave_num = sizeof(RegisterSaver_LiveRegsWithoutR2)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveRegsWithoutR2; break; case all_integer_registers: regstosave_num = sizeof(RegisterSaver_LiveIntRegs)/sizeof(RegisterSaver::LiveRegType); live_regs = RegisterSaver_LiveIntRegs; break; case all_volatile_registers: regstosave_num = sizeof(RegisterSaver_LiveVolatileRegs)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveVolatileRegs; break; case arg_registers: regstosave_num = sizeof(RegisterSaver_LiveArgRegs)/sizeof(RegisterSaver::LiveRegType);; live_regs = RegisterSaver_LiveArgRegs; break; default: ShouldNotReachHere(); } // Restore all registers (ints and floats). // Register save area in new frame starts above z_abi_160 area. offset = register_save_offset; for (int i = 0; i < regstosave_num; i++, offset += reg_size) { int reg_num = live_regs[i].reg_num; int reg_type = live_regs[i].reg_type; switch (reg_type) { case RegisterSaver::excluded_reg: continue; // Continue with next loop iteration. case RegisterSaver::int_reg: { Register reg = as_Register(reg_num); if (last != reg->predecessor()) { if (first != noreg) { __ z_lmg(first, last, first_offset, Z_SP); } first = reg; first_offset = offset; DEBUG_ONLY(float_spilled = false); } last = reg; assert(last != Z_R0, "r0 would require special treatment"); assert(!float_spilled, "for simplicity, do not mix up ints and floats in RegisterSaver_LiveRegs[]"); break; } case RegisterSaver::float_reg: { FloatRegister freg = as_FloatRegister(reg_num); __ z_ld(freg, offset, Z_SP); DEBUG_ONLY(float_spilled = true); break; } default: ShouldNotReachHere(); } } assert(first != noreg, "Should spill at least one int reg."); __ z_lmg(first, last, first_offset, Z_SP); for (int i = 0; i < vregstosave_num; i++, offset += v_reg_size) { int reg_num = RegisterSaver_LiveVRegs[i].reg_num; __ z_vl(as_VectorRegister(reg_num), Address(Z_SP, offset)); } // Pop the frame. __ pop_frame(); // Restore the flags. __ restore_return_pc(); } // Pop the current frame and restore the registers that might be holding a result. void RegisterSaver::restore_result_registers(MacroAssembler* masm) { const int regstosave_num = sizeof(RegisterSaver_LiveRegs) / sizeof(RegisterSaver::LiveRegType); const int register_save_offset = live_reg_frame_size(all_registers) - live_reg_save_size(all_registers); // Restore all result registers (ints and floats). int offset = register_save_offset; for (int i = 0; i < regstosave_num; i++, offset += reg_size) { int reg_num = RegisterSaver_LiveRegs[i].reg_num; int reg_type = RegisterSaver_LiveRegs[i].reg_type; switch (reg_type) { case RegisterSaver::excluded_reg: continue; // Continue with next loop iteration. case RegisterSaver::int_reg: { if (as_Register(reg_num) == Z_RET) { // int result_reg __ z_lg(as_Register(reg_num), offset, Z_SP); } break; } case RegisterSaver::float_reg: { if (as_FloatRegister(reg_num) == Z_FRET) { // float result_reg __ z_ld(as_FloatRegister(reg_num), offset, Z_SP); } break; } default: ShouldNotReachHere(); } } assert(offset == live_reg_frame_size(all_registers), "consistency check"); } // --------------------------------------------------------------------------- void SharedRuntime::save_native_result(MacroAssembler * masm, BasicType ret_type, int frame_slots) { Address memaddr(Z_SP, frame_slots * VMRegImpl::stack_slot_size); switch (ret_type) { case T_BOOLEAN: // Save shorter types as int. Do we need sign extension at restore?? case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: __ reg2mem_opt(Z_RET, memaddr, false); break; case T_OBJECT: // Save pointer types as long. case T_ARRAY: case T_ADDRESS: case T_VOID: case T_LONG: __ reg2mem_opt(Z_RET, memaddr); break; case T_FLOAT: __ freg2mem_opt(Z_FRET, memaddr, false); break; case T_DOUBLE: __ freg2mem_opt(Z_FRET, memaddr); break; default: ShouldNotReachHere(); break; } } void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) { Address memaddr(Z_SP, frame_slots * VMRegImpl::stack_slot_size); switch (ret_type) { case T_BOOLEAN: // Restore shorter types as int. Do we need sign extension at restore?? case T_BYTE: case T_CHAR: case T_SHORT: case T_INT: __ mem2reg_opt(Z_RET, memaddr, false); break; case T_OBJECT: // Restore pointer types as long. case T_ARRAY: case T_ADDRESS: case T_VOID: case T_LONG: __ mem2reg_opt(Z_RET, memaddr); break; case T_FLOAT: __ mem2freg_opt(Z_FRET, memaddr, false); break; case T_DOUBLE: __ mem2freg_opt(Z_FRET, memaddr); break; default: ShouldNotReachHere(); break; } } // --------------------------------------------------------------------------- // Read the array of BasicTypes from a signature, and compute where the // arguments should go. Values in the VMRegPair regs array refer to 4-byte // quantities. Values less than VMRegImpl::stack0 are registers, those above // refer to 4-byte stack slots. All stack slots are based off of the stack pointer // as framesizes are fixed. // VMRegImpl::stack0 refers to the first slot 0(sp). // VMRegImpl::stack0+1 refers to the memory word 4-byes higher. Registers // up to Register::number_of_registers are the 64-bit integer registers. // Note: the INPUTS in sig_bt are in units of Java argument words, which are // either 32-bit or 64-bit depending on the build. The OUTPUTS are in 32-bit // units regardless of build. // The Java calling convention is a "shifted" version of the C ABI. // By skipping the first C ABI register we can call non-static jni methods // with small numbers of arguments without having to shuffle the arguments // at all. Since we control the java ABI we ought to at least get some // advantage out of it. int SharedRuntime::java_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed) { // c2c calling conventions for compiled-compiled calls. // An int/float occupies 1 slot here. const int inc_stk_for_intfloat = 1; // 1 slots for ints and floats. const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles. const VMReg z_iarg_reg[5] = { Z_R2->as_VMReg(), Z_R3->as_VMReg(), Z_R4->as_VMReg(), Z_R5->as_VMReg(), Z_R6->as_VMReg() }; const VMReg z_farg_reg[4] = { Z_F0->as_VMReg(), Z_F2->as_VMReg(), Z_F4->as_VMReg(), Z_F6->as_VMReg() }; const int z_num_iarg_registers = sizeof(z_iarg_reg) / sizeof(z_iarg_reg[0]); const int z_num_farg_registers = sizeof(z_farg_reg) / sizeof(z_farg_reg[0]); assert(Register::number_of_arg_registers == z_num_iarg_registers, "iarg reg count mismatch"); assert(FloatRegister::number_of_arg_registers == z_num_farg_registers, "farg reg count mismatch"); int i; int stk = 0; int ireg = 0; int freg = 0; for (int i = 0; i < total_args_passed; ++i) { switch (sig_bt[i]) { case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: if (ireg < z_num_iarg_registers) { // Put int/ptr in register. regs[i].set1(z_iarg_reg[ireg]); ++ireg; } else { // Put int/ptr on stack. regs[i].set1(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_intfloat; } break; case T_LONG: assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half"); if (ireg < z_num_iarg_registers) { // Put long in register. regs[i].set2(z_iarg_reg[ireg]); ++ireg; } else { // Put long on stack and align to 2 slots. if (stk & 0x1) { ++stk; } regs[i].set2(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_longdouble; } break; case T_OBJECT: case T_ARRAY: case T_ADDRESS: if (ireg < z_num_iarg_registers) { // Put ptr in register. regs[i].set2(z_iarg_reg[ireg]); ++ireg; } else { // Put ptr on stack and align to 2 slots, because // "64-bit pointers record oop-ishness on 2 aligned adjacent // registers." (see OopFlow::build_oop_map). if (stk & 0x1) { ++stk; } regs[i].set2(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_longdouble; } break; case T_FLOAT: if (freg < z_num_farg_registers) { // Put float in register. regs[i].set1(z_farg_reg[freg]); ++freg; } else { // Put float on stack. regs[i].set1(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_intfloat; } break; case T_DOUBLE: assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half"); if (freg < z_num_farg_registers) { // Put double in register. regs[i].set2(z_farg_reg[freg]); ++freg; } else { // Put double on stack and align to 2 slots. if (stk & 0x1) { ++stk; } regs[i].set2(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_longdouble; } break; case T_VOID: assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half"); // Do not count halves. regs[i].set_bad(); break; default: ShouldNotReachHere(); } } return stk; } int SharedRuntime::c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed) { // Calling conventions for C runtime calls and calls to JNI native methods. const VMReg z_iarg_reg[5] = { Z_R2->as_VMReg(), Z_R3->as_VMReg(), Z_R4->as_VMReg(), Z_R5->as_VMReg(), Z_R6->as_VMReg() }; const VMReg z_farg_reg[4] = { Z_F0->as_VMReg(), Z_F2->as_VMReg(), Z_F4->as_VMReg(), Z_F6->as_VMReg() }; const int z_num_iarg_registers = sizeof(z_iarg_reg) / sizeof(z_iarg_reg[0]); const int z_num_farg_registers = sizeof(z_farg_reg) / sizeof(z_farg_reg[0]); // Check calling conventions consistency. assert(Register::number_of_arg_registers == z_num_iarg_registers, "iarg reg count mismatch"); assert(FloatRegister::number_of_arg_registers == z_num_farg_registers, "farg reg count mismatch"); // Avoid passing C arguments in the wrong stack slots. // 'Stk' counts stack slots. Due to alignment, 32 bit values occupy // 2 such slots, like 64 bit values do. const int inc_stk_for_intfloat = 2; // 2 slots for ints and floats. const int inc_stk_for_longdouble = 2; // 2 slots for longs and doubles. int i; // Leave room for C-compatible ABI int stk = (frame::z_abi_160_size - frame::z_jit_out_preserve_size) / VMRegImpl::stack_slot_size; int freg = 0; int ireg = 0; // We put the first 5 arguments into registers and the rest on the // stack. Float arguments are already in their argument registers // due to c2c calling conventions (see calling_convention). for (int i = 0; i < total_args_passed; ++i) { switch (sig_bt[i]) { case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: // Fall through, handle as long. case T_LONG: case T_OBJECT: case T_ARRAY: case T_ADDRESS: case T_METADATA: // Oops are already boxed if required (JNI). if (ireg < z_num_iarg_registers) { regs[i].set2(z_iarg_reg[ireg]); ++ireg; } else { regs[i].set2(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_longdouble; } break; case T_FLOAT: if (freg < z_num_farg_registers) { regs[i].set1(z_farg_reg[freg]); ++freg; } else { regs[i].set1(VMRegImpl::stack2reg(stk+1)); stk += inc_stk_for_intfloat; } break; case T_DOUBLE: assert((i + 1) < total_args_passed && sig_bt[i+1] == T_VOID, "expecting half"); if (freg < z_num_farg_registers) { regs[i].set2(z_farg_reg[freg]); ++freg; } else { // Put double on stack. regs[i].set2(VMRegImpl::stack2reg(stk)); stk += inc_stk_for_longdouble; } break; case T_VOID: // Do not count halves. regs[i].set_bad(); break; default: ShouldNotReachHere(); } } return align_up(stk, 2); } int SharedRuntime::vector_calling_convention(VMRegPair *regs, uint num_bits, uint total_args_passed) { Unimplemented(); return 0; } //////////////////////////////////////////////////////////////////////// // // Argument shufflers // //////////////////////////////////////////////////////////////////////// //---------------------------------------------------------------------- // The java_calling_convention describes stack locations as ideal slots on // a frame with no abi restrictions. Since we must observe abi restrictions // (like the placement of the register window) the slots must be biased by // the following value. //---------------------------------------------------------------------- static int reg2slot(VMReg r) { return r->reg2stack() + SharedRuntime::out_preserve_stack_slots(); } static int reg2offset(VMReg r) { return reg2slot(r) * VMRegImpl::stack_slot_size; } static void verify_oop_args(MacroAssembler *masm, int total_args_passed, const BasicType *sig_bt, const VMRegPair *regs) { if (!VerifyOops) { return; } for (int i = 0; i < total_args_passed; i++) { if (is_reference_type(sig_bt[i])) { VMReg r = regs[i].first(); assert(r->is_valid(), "bad oop arg"); if (r->is_stack()) { __ z_lg(Z_R0_scratch, Address(Z_SP, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize)); __ verify_oop(Z_R0_scratch, FILE_AND_LINE); } else { __ verify_oop(r->as_Register(), FILE_AND_LINE); } } } } static void gen_special_dispatch(MacroAssembler *masm, int total_args_passed, vmIntrinsics::ID special_dispatch, const BasicType *sig_bt, const VMRegPair *regs) { verify_oop_args(masm, total_args_passed, sig_bt, regs); // Now write the args into the outgoing interpreter space. bool has_receiver = false; Register receiver_reg = noreg; int member_arg_pos = -1; Register member_reg = noreg; int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(special_dispatch); if (ref_kind != 0) { member_arg_pos = total_args_passed - 1; // trailing MemberName argument member_reg = Z_R9; // Known to be free at this point. has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind); } else if (special_dispatch == vmIntrinsics::_linkToNative) { member_arg_pos = total_args_passed - 1; // trailing NativeEntryPoint argument member_reg = Z_R9; // known to be free at this point } else { guarantee(special_dispatch == vmIntrinsics::_invokeBasic, "special_dispatch=%d", vmIntrinsics::as_int(special_dispatch)); has_receiver = true; } if (member_reg != noreg) { // Load the member_arg into register, if necessary. assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob"); assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object"); VMReg r = regs[member_arg_pos].first(); assert(r->is_valid(), "bad member arg"); if (r->is_stack()) { __ z_lg(member_reg, Address(Z_SP, reg2offset(r))); } else { // No data motion is needed. member_reg = r->as_Register(); } } if (has_receiver) { // Make sure the receiver is loaded into a register. assert(total_args_passed > 0, "oob"); assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object"); VMReg r = regs[0].first(); assert(r->is_valid(), "bad receiver arg"); if (r->is_stack()) { // Porting note: This assumes that compiled calling conventions always // pass the receiver oop in a register. If this is not true on some // platform, pick a temp and load the receiver from stack. assert(false, "receiver always in a register"); receiver_reg = Z_R13; // Known to be free at this point. __ z_lg(receiver_reg, Address(Z_SP, reg2offset(r))); } else { // No data motion is needed. receiver_reg = r->as_Register(); } } // Figure out which address we are really jumping to: MethodHandles::generate_method_handle_dispatch(masm, special_dispatch, receiver_reg, member_reg, /*for_compiler_entry:*/ true); } //////////////////////////////////////////////////////////////////////// // // Argument shufflers // //////////////////////////////////////////////////////////////////////// // Is the size of a vector size (in bytes) bigger than a size saved by default? // 8 bytes registers are saved by default on z/Architecture. bool SharedRuntime::is_wide_vector(int size) { // Note, MaxVectorSize == 8/16 on this platform. assert(size <= (SuperwordUseVX ? 16 : 8), "%d bytes vectors are not supported", size); return size > 8; } //---------------------------------------------------------------------- // An oop arg. Must pass a handle not the oop itself //---------------------------------------------------------------------- static void object_move(MacroAssembler *masm, OopMap *map, int oop_handle_offset, int framesize_in_slots, VMRegPair src, VMRegPair dst, bool is_receiver, int *receiver_offset) { int frame_offset = framesize_in_slots*VMRegImpl::stack_slot_size; assert(!is_receiver || (is_receiver && (*receiver_offset == -1)), "only one receiving object per call, please."); // Must pass a handle. First figure out the location we use as a handle. if (src.first()->is_stack()) { // Oop is already on the stack, put handle on stack or in register // If handle will be on the stack, use temp reg to calculate it. Register rHandle = dst.first()->is_stack() ? Z_R1 : dst.first()->as_Register(); Label skip; int slot_in_older_frame = reg2slot(src.first()); guarantee(!is_receiver, "expecting receiver in register"); map->set_oop(VMRegImpl::stack2reg(slot_in_older_frame + framesize_in_slots)); __ add2reg(rHandle, reg2offset(src.first())+frame_offset, Z_SP); __ load_and_test_long(Z_R0, Address(rHandle)); __ z_brne(skip); // Use a null handle if oop is null. __ clear_reg(rHandle, true, false); __ bind(skip); // Copy handle to the right place (register or stack). if (dst.first()->is_stack()) { __ z_stg(rHandle, reg2offset(dst.first()), Z_SP); } // else // nothing to do. rHandle uses the correct register } else { // Oop is passed in an input register. We must flush it to the stack. const Register rOop = src.first()->as_Register(); const Register rHandle = dst.first()->is_stack() ? Z_R1 : dst.first()->as_Register(); int oop_slot = (rOop->encoding()-Z_ARG1->encoding()) * VMRegImpl::slots_per_word + oop_handle_offset; int oop_slot_offset = oop_slot*VMRegImpl::stack_slot_size; NearLabel skip; if (is_receiver) { *receiver_offset = oop_slot_offset; } map->set_oop(VMRegImpl::stack2reg(oop_slot)); // Flush Oop to stack, calculate handle. __ z_stg(rOop, oop_slot_offset, Z_SP); __ add2reg(rHandle, oop_slot_offset, Z_SP); // If Oop is null, use a null handle. __ compare64_and_branch(rOop, (RegisterOrConstant)0L, Assembler::bcondNotEqual, skip); __ clear_reg(rHandle, true, false); __ bind(skip); // Copy handle to the right place (register or stack). if (dst.first()->is_stack()) { __ z_stg(rHandle, reg2offset(dst.first()), Z_SP); } // else // nothing to do here, since rHandle = dst.first()->as_Register in this case. } } //---------------------------------------------------------------------- // A float arg. May have to do float reg to int reg conversion //---------------------------------------------------------------------- static void float_move(MacroAssembler *masm, VMRegPair src, VMRegPair dst, int framesize_in_slots, int workspace_slot_offset) { int frame_offset = framesize_in_slots * VMRegImpl::stack_slot_size; int workspace_offset = workspace_slot_offset * VMRegImpl::stack_slot_size; // We do not accept an argument in a VMRegPair to be spread over two slots, // no matter what physical location (reg or stack) the slots may have. // We just check for the unaccepted slot to be invalid. assert(!src.second()->is_valid(), "float in arg spread over two slots"); assert(!dst.second()->is_valid(), "float out arg spread over two slots"); if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack -> stack. The easiest of the bunch. __ z_mvc(Address(Z_SP, reg2offset(dst.first())), Address(Z_SP, reg2offset(src.first()) + frame_offset), sizeof(float)); } else { // stack to reg Address memaddr(Z_SP, reg2offset(src.first()) + frame_offset); if (dst.first()->is_Register()) { __ mem2reg_opt(dst.first()->as_Register(), memaddr, false); } else { __ mem2freg_opt(dst.first()->as_FloatRegister(), memaddr, false); } } } else if (src.first()->is_Register()) { if (dst.first()->is_stack()) { // gpr -> stack __ reg2mem_opt(src.first()->as_Register(), Address(Z_SP, reg2offset(dst.first()), false )); } else { if (dst.first()->is_Register()) { // gpr -> gpr __ move_reg_if_needed(dst.first()->as_Register(), T_INT, src.first()->as_Register(), T_INT); } else { if (VM_Version::has_FPSupportEnhancements()) { // gpr -> fpr. Exploit z10 capability of direct transfer. __ z_ldgr(dst.first()->as_FloatRegister(), src.first()->as_Register()); } else { // gpr -> fpr. Use work space on stack to transfer data. Address stackaddr(Z_SP, workspace_offset); __ reg2mem_opt(src.first()->as_Register(), stackaddr, false); __ mem2freg_opt(dst.first()->as_FloatRegister(), stackaddr, false); } } } } else { if (dst.first()->is_stack()) { // fpr -> stack __ freg2mem_opt(src.first()->as_FloatRegister(), Address(Z_SP, reg2offset(dst.first())), false); } else { if (dst.first()->is_Register()) { if (VM_Version::has_FPSupportEnhancements()) { // fpr -> gpr. __ z_lgdr(dst.first()->as_Register(), src.first()->as_FloatRegister()); } else { // fpr -> gpr. Use work space on stack to transfer data. Address stackaddr(Z_SP, workspace_offset); __ freg2mem_opt(src.first()->as_FloatRegister(), stackaddr, false); __ mem2reg_opt(dst.first()->as_Register(), stackaddr, false); } } else { // fpr -> fpr __ move_freg_if_needed(dst.first()->as_FloatRegister(), T_FLOAT, src.first()->as_FloatRegister(), T_FLOAT); } } } } //---------------------------------------------------------------------- // A double arg. May have to do double reg to long reg conversion //---------------------------------------------------------------------- static void double_move(MacroAssembler *masm, VMRegPair src, VMRegPair dst, int framesize_in_slots, int workspace_slot_offset) { int frame_offset = framesize_in_slots*VMRegImpl::stack_slot_size; int workspace_offset = workspace_slot_offset*VMRegImpl::stack_slot_size; // Since src is always a java calling convention we know that the // src pair is always either all registers or all stack (and aligned?) if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack -> stack. The easiest of the bunch. __ z_mvc(Address(Z_SP, reg2offset(dst.first())), Address(Z_SP, reg2offset(src.first()) + frame_offset), sizeof(double)); } else { // stack to reg Address stackaddr(Z_SP, reg2offset(src.first()) + frame_offset); if (dst.first()->is_Register()) { __ mem2reg_opt(dst.first()->as_Register(), stackaddr); } else { __ mem2freg_opt(dst.first()->as_FloatRegister(), stackaddr); } } } else if (src.first()->is_Register()) { if (dst.first()->is_stack()) { // gpr -> stack __ reg2mem_opt(src.first()->as_Register(), Address(Z_SP, reg2offset(dst.first()))); } else { if (dst.first()->is_Register()) { // gpr -> gpr __ move_reg_if_needed(dst.first()->as_Register(), T_LONG, src.first()->as_Register(), T_LONG); } else { if (VM_Version::has_FPSupportEnhancements()) { // gpr -> fpr. Exploit z10 capability of direct transfer. __ z_ldgr(dst.first()->as_FloatRegister(), src.first()->as_Register()); } else { // gpr -> fpr. Use work space on stack to transfer data. Address stackaddr(Z_SP, workspace_offset); __ reg2mem_opt(src.first()->as_Register(), stackaddr); __ mem2freg_opt(dst.first()->as_FloatRegister(), stackaddr); } } } } else { if (dst.first()->is_stack()) { // fpr -> stack __ freg2mem_opt(src.first()->as_FloatRegister(), Address(Z_SP, reg2offset(dst.first()))); } else { if (dst.first()->is_Register()) { if (VM_Version::has_FPSupportEnhancements()) { // fpr -> gpr. Exploit z10 capability of direct transfer. __ z_lgdr(dst.first()->as_Register(), src.first()->as_FloatRegister()); } else { // fpr -> gpr. Use work space on stack to transfer data. Address stackaddr(Z_SP, workspace_offset); __ freg2mem_opt(src.first()->as_FloatRegister(), stackaddr); __ mem2reg_opt(dst.first()->as_Register(), stackaddr); } } else { // fpr -> fpr // In theory these overlap but the ordering is such that this is likely a nop. __ move_freg_if_needed(dst.first()->as_FloatRegister(), T_DOUBLE, src.first()->as_FloatRegister(), T_DOUBLE); } } } } //---------------------------------------------------------------------- // A long arg. //---------------------------------------------------------------------- static void long_move(MacroAssembler *masm, VMRegPair src, VMRegPair dst, int framesize_in_slots) { int frame_offset = framesize_in_slots*VMRegImpl::stack_slot_size; if (src.first()->is_stack()) { if (dst.first()->is_stack()) { // stack -> stack. The easiest of the bunch. __ z_mvc(Address(Z_SP, reg2offset(dst.first())), Address(Z_SP, reg2offset(src.first()) + frame_offset), sizeof(long)); } else { // stack to reg assert(dst.first()->is_Register(), "long dst value must be in GPR"); __ mem2reg_opt(dst.first()->as_Register(), Address(Z_SP, reg2offset(src.first()) + frame_offset)); } } else { // reg to reg assert(src.first()->is_Register(), "long src value must be in GPR"); if (dst.first()->is_stack()) { // reg -> stack __ reg2mem_opt(src.first()->as_Register(), Address(Z_SP, reg2offset(dst.first()))); } else { // reg -> reg assert(dst.first()->is_Register(), "long dst value must be in GPR"); __ move_reg_if_needed(dst.first()->as_Register(), T_LONG, src.first()->as_Register(), T_LONG); } } } //---------------------------------------------------------------------- // A int-like arg. //---------------------------------------------------------------------- // On z/Architecture we will store integer like items to the stack as 64 bit // items, according to the z/Architecture ABI, even though Java would only store // 32 bits for a parameter. // We do sign extension for all base types. That is ok since the only // unsigned base type is T_CHAR, and T_CHAR uses only 16 bits of an int. // Sign extension 32->64 bit will thus not affect the value. //---------------------------------------------------------------------- static void move32_64(MacroAssembler *masm, VMRegPair src, VMRegPair dst, int framesize_in_slots) { int frame_offset = framesize_in_slots * VMRegImpl::stack_slot_size; if (src.first()->is_stack()) { Address memaddr(Z_SP, reg2offset(src.first()) + frame_offset); if (dst.first()->is_stack()) { // stack -> stack. MVC not possible due to sign extension. Address firstaddr(Z_SP, reg2offset(dst.first())); __ mem2reg_signed_opt(Z_R0_scratch, memaddr); __ reg2mem_opt(Z_R0_scratch, firstaddr); } else { // stack -> reg, sign extended __ mem2reg_signed_opt(dst.first()->as_Register(), memaddr); } } else { if (dst.first()->is_stack()) { // reg -> stack, sign extended Address firstaddr(Z_SP, reg2offset(dst.first())); __ z_lgfr(src.first()->as_Register(), src.first()->as_Register()); __ reg2mem_opt(src.first()->as_Register(), firstaddr); } else { // reg -> reg, sign extended __ z_lgfr(dst.first()->as_Register(), src.first()->as_Register()); } } } //---------------------------------------------------------------------- // Wrap a JNI call. //---------------------------------------------------------------------- #undef USE_RESIZE_FRAME nmethod *SharedRuntime::generate_native_wrapper(MacroAssembler *masm, const methodHandle& method, int compile_id, BasicType *in_sig_bt, VMRegPair *in_regs, BasicType ret_type) { int total_in_args = method->size_of_parameters(); if (method->is_method_handle_intrinsic()) { vmIntrinsics::ID iid = method->intrinsic_id(); intptr_t start = (intptr_t) __ pc(); int vep_offset = ((intptr_t) __ pc()) - start; gen_special_dispatch(masm, total_in_args, method->intrinsic_id(), in_sig_bt, in_regs); int frame_complete = ((intptr_t)__ pc()) - start; // Not complete, period. __ flush(); int stack_slots = SharedRuntime::out_preserve_stack_slots(); // No out slots at all, actually. return nmethod::new_native_nmethod(method, compile_id, masm->code(), vep_offset, frame_complete, stack_slots / VMRegImpl::slots_per_word, in_ByteSize(-1), in_ByteSize(-1), (OopMapSet *) nullptr); } /////////////////////////////////////////////////////////////////////// // // Precalculations before generating any code // /////////////////////////////////////////////////////////////////////// address native_func = method->native_function(); assert(native_func != nullptr, "must have function"); //--------------------------------------------------------------------- // We have received a description of where all the java args are located // on entry to the wrapper. We need to convert these args to where // the jni function will expect them. To figure out where they go // we convert the java signature to a C signature by inserting // the hidden arguments as arg[0] and possibly arg[1] (static method). // // The first hidden argument arg[0] is a pointer to the JNI environment. // It is generated for every call. // The second argument arg[1] to the JNI call, which is hidden for static // methods, is the boxed lock object. For static calls, the lock object // is the static method itself. The oop is constructed here. for instance // calls, the lock is performed on the object itself, the pointer of // which is passed as the first visible argument. //--------------------------------------------------------------------- // Additionally, on z/Architecture we must convert integers // to longs in the C signature. We do this in advance in order to have // no trouble with indexes into the bt-arrays. // So convert the signature and registers now, and adjust the total number // of in-arguments accordingly. bool method_is_static = method->is_static(); int total_c_args = total_in_args + (method_is_static ? 2 : 1); BasicType *out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args); VMRegPair *out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args); // Create the signature for the C call: // 1) add the JNIEnv* // 2) add the class if the method is static // 3) copy the rest of the incoming signature (shifted by the number of // hidden arguments) int argc = 0; out_sig_bt[argc++] = T_ADDRESS; if (method->is_static()) { out_sig_bt[argc++] = T_OBJECT; } for (int i = 0; i < total_in_args; i++) { out_sig_bt[argc++] = in_sig_bt[i]; } /////////////////////////////////////////////////////////////////////// // Now figure out where the args must be stored and how much stack space // they require (neglecting out_preserve_stack_slots but providing space // for storing the first five register arguments). // It's weird, see int_stk_helper. /////////////////////////////////////////////////////////////////////// //--------------------------------------------------------------------- // Compute framesize for the wrapper. // // - We need to handlize all oops passed in registers. // - We must create space for them here that is disjoint from the save area. // - We always just allocate 5 words for storing down these object. // This allows us to simply record the base and use the Ireg number to // decide which slot to use. // - Note that the reg number used to index the stack slot is the inbound // number, not the outbound number. // - We must shuffle args to match the native convention, // and to include var-args space. //--------------------------------------------------------------------- //--------------------------------------------------------------------- // Calculate the total number of stack slots we will need: // - 1) abi requirements // - 2) outgoing args // - 3) space for inbound oop handle area // - 4) space for handlizing a klass if static method // - 5) space for a lock if synchronized method // - 6) workspace (save rtn value, int<->float reg moves, ...) // - 7) filler slots for alignment //--------------------------------------------------------------------- // Here is how the space we have allocated will look like. // Since we use resize_frame, we do not create a new stack frame, // but just extend the one we got with our own data area. // // If an offset or pointer name points to a separator line, it is // assumed that addressing with offset 0 selects storage starting // at the first byte above the separator line. // // // ... ... // | caller's frame | // FP-> |---------------------| // | filler slots, if any| // 7| #slots == mult of 2 | // |---------------------| // | work space | // 6| 2 slots = 8 bytes | // |---------------------| // 5| lock box (if sync) | // |---------------------| <- lock_slot_offset // 4| klass (if static) | // |---------------------| <- klass_slot_offset // 3| oopHandle area | // | | // | | // |---------------------| <- oop_handle_offset // 2| outbound memory | // ... ... // | based arguments | // |---------------------| // | vararg | // ... ... // | area | // |---------------------| <- out_arg_slot_offset // 1| out_preserved_slots | // ... ... // | (z_abi spec) | // SP-> |---------------------| <- FP_slot_offset (back chain) // ... ... // //--------------------------------------------------------------------- // *_slot_offset indicates offset from SP in #stack slots // *_offset indicates offset from SP in #bytes int stack_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args) + // 1+2 SharedRuntime::out_preserve_stack_slots(); // see c_calling_convention // Now the space for the inbound oop handle area. int total_save_slots = Register::number_of_arg_registers * VMRegImpl::slots_per_word; int oop_handle_slot_offset = stack_slots; stack_slots += total_save_slots; // 3) int klass_slot_offset = 0; int klass_offset = -1; if (method_is_static) { // 4) klass_slot_offset = stack_slots; klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size; stack_slots += VMRegImpl::slots_per_word; } int lock_slot_offset = 0; int lock_offset = -1; if (method->is_synchronized()) { // 5) lock_slot_offset = stack_slots; lock_offset = lock_slot_offset * VMRegImpl::stack_slot_size; stack_slots += VMRegImpl::slots_per_word; } int workspace_slot_offset= stack_slots; // 6) stack_slots += 2; // Now compute actual number of stack words we need. // Round to align stack properly. stack_slots = align_up(stack_slots, // 7) frame::alignment_in_bytes / VMRegImpl::stack_slot_size); int frame_size_in_bytes = stack_slots * VMRegImpl::stack_slot_size; /////////////////////////////////////////////////////////////////////// // Now we can start generating code /////////////////////////////////////////////////////////////////////// unsigned int wrapper_CodeStart = __ offset(); unsigned int wrapper_UEPStart; unsigned int wrapper_VEPStart; unsigned int wrapper_FrameDone; unsigned int wrapper_CRegsSet; Label handle_pending_exception; //--------------------------------------------------------------------- // Unverified entry point (UEP) //--------------------------------------------------------------------- // check ic: object class <-> cached class if (!method_is_static) { wrapper_UEPStart = __ ic_check(CodeEntryAlignment /* end_alignment */); } //--------------------------------------------------------------------- // Verified entry point (VEP) //--------------------------------------------------------------------- wrapper_VEPStart = __ offset(); if (method->needs_clinit_barrier()) { assert(VM_Version::supports_fast_class_init_checks(), "sanity"); Label L_skip_barrier; Register klass = Z_R1_scratch; // Notify OOP recorder (don't need the relocation) AddressLiteral md = __ constant_metadata_address(method->method_holder()); __ load_const_optimized(klass, md.value()); __ clinit_barrier(klass, Z_thread, &L_skip_barrier /*L_fast_path*/); __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub()); __ z_br(klass); __ bind(L_skip_barrier); } __ save_return_pc(); __ generate_stack_overflow_check(frame_size_in_bytes); // Check before creating frame. #ifndef USE_RESIZE_FRAME __ push_frame(frame_size_in_bytes); // Create a new frame for the wrapper. #else __ resize_frame(-frame_size_in_bytes, Z_R0_scratch); // No new frame for the wrapper. // Just resize the existing one. #endif BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler(); bs->nmethod_entry_barrier(masm); wrapper_FrameDone = __ offset(); // Native nmethod wrappers never take possession of the oop arguments. // So the caller will gc the arguments. // The only thing we need an oopMap for is if the call is static. // // An OopMap for lock (and class if static), and one for the VM call itself OopMapSet *oop_maps = new OopMapSet(); OopMap *map = new OopMap(stack_slots * 2, 0 /* arg_slots*/); ////////////////////////////////////////////////////////////////////// // // The Grand Shuffle // ////////////////////////////////////////////////////////////////////// // // We immediately shuffle the arguments so that for any vm call we have // to make from here on out (sync slow path, jvmti, etc.) we will have // captured the oops from our caller and have a valid oopMap for them. // //-------------------------------------------------------------------- // Natives require 1 or 2 extra arguments over the normal ones: the JNIEnv* // (derived from JavaThread* which is in Z_thread) and, if static, // the class mirror instead of a receiver. This pretty much guarantees that // register layout will not match. We ignore these extra arguments during // the shuffle. The shuffle is described by the two calling convention // vectors we have in our possession. We simply walk the java vector to // get the source locations and the c vector to get the destinations. // // This is a trick. We double the stack slots so we can claim // the oops in the caller's frame. Since we are sure to have // more args than the caller doubling is enough to make // sure we can capture all the incoming oop args from the caller. //-------------------------------------------------------------------- // Record sp-based slot for receiver on stack for non-static methods. int receiver_offset = -1; //-------------------------------------------------------------------- // We move the arguments backwards because the floating point registers // destination will always be to a register with a greater or equal // register number or the stack. // jix is the index of the incoming Java arguments. // cix is the index of the outgoing C arguments. //-------------------------------------------------------------------- #ifdef ASSERT bool reg_destroyed[Register::number_of_registers]; bool freg_destroyed[FloatRegister::number_of_registers]; for (int r = 0; r < Register::number_of_registers; r++) { reg_destroyed[r] = false; } for (int f = 0; f < FloatRegister::number_of_registers; f++) { freg_destroyed[f] = false; } #endif // ASSERT for (int jix = total_in_args - 1, cix = total_c_args - 1; jix >= 0; jix--, cix--) { #ifdef ASSERT if (in_regs[jix].first()->is_Register()) { assert(!reg_destroyed[in_regs[jix].first()->as_Register()->encoding()], "ack!"); } else { if (in_regs[jix].first()->is_FloatRegister()) { assert(!freg_destroyed[in_regs[jix].first()->as_FloatRegister()->encoding()], "ack!"); } } if (out_regs[cix].first()->is_Register()) { reg_destroyed[out_regs[cix].first()->as_Register()->encoding()] = true; } else { if (out_regs[cix].first()->is_FloatRegister()) { freg_destroyed[out_regs[cix].first()->as_FloatRegister()->encoding()] = true; } } #endif // ASSERT switch (in_sig_bt[jix]) { // Due to casting, small integers should only occur in pairs with type T_LONG. case T_BOOLEAN: case T_CHAR: case T_BYTE: case T_SHORT: case T_INT: // Move int and do sign extension. move32_64(masm, in_regs[jix], out_regs[cix], stack_slots); break; case T_LONG : long_move(masm, in_regs[jix], out_regs[cix], stack_slots); break; case T_ARRAY: case T_OBJECT: object_move(masm, map, oop_handle_slot_offset, stack_slots, in_regs[jix], out_regs[cix], ((jix == 0) && (!method_is_static)), &receiver_offset); break; case T_VOID: break; case T_FLOAT: float_move(masm, in_regs[jix], out_regs[cix], stack_slots, workspace_slot_offset); break; case T_DOUBLE: assert(jix+1 < total_in_args && in_sig_bt[jix+1] == T_VOID && out_sig_bt[cix+1] == T_VOID, "bad arg list"); double_move(masm, in_regs[jix], out_regs[cix], stack_slots, workspace_slot_offset); break; case T_ADDRESS: assert(false, "found T_ADDRESS in java args"); break; default: ShouldNotReachHere(); } } //-------------------------------------------------------------------- // Pre-load a static method's oop into ARG2. // Used both by locking code and the normal JNI call code. //-------------------------------------------------------------------- if (method_is_static) { __ set_oop_constant(JNIHandles::make_local(method->method_holder()->java_mirror()), Z_ARG2); // Now handlize the static class mirror in ARG2. It's known not-null. __ z_stg(Z_ARG2, klass_offset, Z_SP); map->set_oop(VMRegImpl::stack2reg(klass_slot_offset)); __ add2reg(Z_ARG2, klass_offset, Z_SP); } // Get JNIEnv* which is first argument to native. __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread); ////////////////////////////////////////////////////////////////////// // We have all of the arguments setup at this point. // We MUST NOT touch any outgoing regs from this point on. // So if we must call out we must push a new frame. ////////////////////////////////////////////////////////////////////// // Calc the current pc into Z_R10 and into wrapper_CRegsSet. // Both values represent the same position. __ get_PC(Z_R10); // PC into register wrapper_CRegsSet = __ offset(); // and into into variable. // Z_R10 now has the pc loaded that we will use when we finally call to native. // We use the same pc/oopMap repeatedly when we call out. oop_maps->add_gc_map((int)(wrapper_CRegsSet-wrapper_CodeStart), map); // Lock a synchronized method. if (method->is_synchronized()) { // ATTENTION: args and Z_R10 must be preserved. Register r_oop = Z_R11; Register r_box = Z_R12; Register r_tmp1 = Z_R13; Register r_tmp2 = Z_R7; Label done; // Load the oop for the object or class. R_carg2_classorobject contains // either the handlized oop from the incoming arguments or the handlized // class mirror (if the method is static). __ z_lg(r_oop, 0, Z_ARG2); lock_offset = (lock_slot_offset * VMRegImpl::stack_slot_size); // Get the lock box slot's address. __ add2reg(r_box, lock_offset, Z_SP); // Try fastpath for locking. // Fast_lock kills r_temp_1, r_temp_2. __ compiler_fast_lock_object(r_oop, r_box, r_tmp1, r_tmp2); __ z_bre(done); //------------------------------------------------------------------------- // None of the above fast optimizations worked so we have to get into the // slow case of monitor enter. Inline a special case of call_VM that // disallows any pending_exception. //------------------------------------------------------------------------- Register oldSP = Z_R11; __ z_lgr(oldSP, Z_SP); RegisterSaver::save_live_registers(masm, RegisterSaver::arg_registers); // Prepare arguments for call. __ z_lg(Z_ARG1, 0, Z_ARG2); // Ynboxed class mirror or unboxed object. __ add2reg(Z_ARG2, lock_offset, oldSP); __ z_lgr(Z_ARG3, Z_thread); __ set_last_Java_frame(oldSP, Z_R10 /* gc map pc */); // Do the call. __ load_const_optimized(Z_R1_scratch, CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C)); __ call(Z_R1_scratch); __ reset_last_Java_frame(); RegisterSaver::restore_live_registers(masm, RegisterSaver::arg_registers); #ifdef ASSERT { Label L; __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset())); __ z_bre(L); __ stop("no pending exception allowed on exit from IR::monitorenter"); __ bind(L); } #endif __ bind(done); } // lock for synchronized methods ////////////////////////////////////////////////////////////////////// // Finally just about ready to make the JNI call. ////////////////////////////////////////////////////////////////////// // Use that pc we placed in Z_R10 a while back as the current frame anchor. __ set_last_Java_frame(Z_SP, Z_R10); // Transition from _thread_in_Java to _thread_in_native. __ set_thread_state(_thread_in_native); ////////////////////////////////////////////////////////////////////// // This is the JNI call. ////////////////////////////////////////////////////////////////////// __ call_c(native_func); ////////////////////////////////////////////////////////////////////// // We have survived the call once we reach here. ////////////////////////////////////////////////////////////////////// //-------------------------------------------------------------------- // Unpack native results. //-------------------------------------------------------------------- // For int-types, we do any needed sign-extension required. // Care must be taken that the return value (in Z_ARG1 = Z_RET = Z_R2 // or in Z_FARG0 = Z_FRET = Z_F0) will survive any VM calls for // blocking or unlocking. // An OOP result (handle) is done specially in the slow-path code. //-------------------------------------------------------------------- switch (ret_type) { case T_VOID: break; // Nothing to do! case T_FLOAT: break; // Got it where we want it (unless slow-path) case T_DOUBLE: break; // Got it where we want it (unless slow-path) case T_LONG: break; // Got it where we want it (unless slow-path) case T_OBJECT: break; // Really a handle. // Cannot de-handlize until after reclaiming jvm_lock. case T_ARRAY: break; case T_BOOLEAN: // 0 -> false(0); !0 -> true(1) __ z_lngfr(Z_RET, Z_RET); // Force sign bit on except for zero. __ z_srlg(Z_RET, Z_RET, 63); // Shift sign bit into least significant pos. break; case T_BYTE: __ z_lgbr(Z_RET, Z_RET); break; // sign extension case T_CHAR: __ z_llghr(Z_RET, Z_RET); break; // unsigned result case T_SHORT: __ z_lghr(Z_RET, Z_RET); break; // sign extension case T_INT: __ z_lgfr(Z_RET, Z_RET); break; // sign-extend for beauty. default: ShouldNotReachHere(); break; } // Switch thread to "native transition" state before reading the synchronization state. // This additional state is necessary because reading and testing the synchronization // state is not atomic w.r.t. GC, as this scenario demonstrates: // - Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted. // - VM thread changes sync state to synchronizing and suspends threads for GC. // - Thread A is resumed to finish this native method, but doesn't block here since it // didn't see any synchronization in progress, and escapes. // Transition from _thread_in_native to _thread_in_native_trans. __ set_thread_state(_thread_in_native_trans); // Safepoint synchronization //-------------------------------------------------------------------- // Must we block? //-------------------------------------------------------------------- // Block, if necessary, before resuming in _thread_in_Java state. // In order for GC to work, don't clear the last_Java_sp until after blocking. //-------------------------------------------------------------------- { Label no_block, sync; save_native_result(masm, ret_type, workspace_slot_offset); // Make Z_R2 available as work reg. // Force this write out before the read below. if (!UseSystemMemoryBarrier) { __ z_fence(); } __ safepoint_poll(sync, Z_R1); __ load_and_test_int(Z_R0, Address(Z_thread, JavaThread::suspend_flags_offset())); __ z_bre(no_block); // Block. Save any potential method result value before the operation and // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this // lets us share the oopMap we used when we went native rather than create // a distinct one for this pc. // __ bind(sync); __ z_acquire(); address entry_point = CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans); __ call_VM_leaf(entry_point, Z_thread); __ bind(no_block); restore_native_result(masm, ret_type, workspace_slot_offset); } //-------------------------------------------------------------------- // Thread state is thread_in_native_trans. Any safepoint blocking has // already happened so we can now change state to _thread_in_Java. //-------------------------------------------------------------------- // Transition from _thread_in_native_trans to _thread_in_Java. __ set_thread_state(_thread_in_Java); //-------------------------------------------------------------------- // Reguard any pages if necessary. // Protect native result from being destroyed. //-------------------------------------------------------------------- Label no_reguard; __ z_cli(Address(Z_thread, JavaThread::stack_guard_state_offset() + in_ByteSize(sizeof(StackOverflow::StackGuardState) - 1)), StackOverflow::stack_guard_yellow_reserved_disabled); __ z_bre(no_reguard); save_native_result(masm, ret_type, workspace_slot_offset); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages), Z_method); restore_native_result(masm, ret_type, workspace_slot_offset); __ bind(no_reguard); // Synchronized methods (slow path only) // No pending exceptions for now. //-------------------------------------------------------------------- // Handle possibly pending exception (will unlock if necessary). // Native result is, if any is live, in Z_FRES or Z_RES. //-------------------------------------------------------------------- // Unlock //-------------------------------------------------------------------- if (method->is_synchronized()) { const Register r_oop = Z_R11; const Register r_box = Z_R12; const Register r_tmp1 = Z_R13; const Register r_tmp2 = Z_R7; Label done; // Get unboxed oop of class mirror or object ... int offset = method_is_static ? klass_offset : receiver_offset; assert(offset != -1, ""); __ z_lg(r_oop, offset, Z_SP); // ... and address of lock object box. __ add2reg(r_box, lock_offset, Z_SP); // Try fastpath for unlocking. // Fast_unlock kills r_tmp1, r_tmp2. __ compiler_fast_unlock_object(r_oop, r_box, r_tmp1, r_tmp2); __ z_bre(done); // Slow path for unlocking. // Save and restore any potential method result value around the unlocking operation. const Register R_exc = Z_R11; save_native_result(masm, ret_type, workspace_slot_offset); // Must save pending exception around the slow-path VM call. Since it's a // leaf call, the pending exception (if any) can be kept in a register. __ z_lg(R_exc, Address(Z_thread, Thread::pending_exception_offset())); assert(R_exc->is_nonvolatile(), "exception register must be non-volatile"); // Must clear pending-exception before re-entering the VM. Since this is // a leaf call, pending-exception-oop can be safely kept in a register. __ clear_mem(Address(Z_thread, Thread::pending_exception_offset()), sizeof(intptr_t)); // Inline a special case of call_VM that disallows any pending_exception. // Get locked oop from the handle we passed to jni. __ z_lg(Z_ARG1, offset, Z_SP); __ add2reg(Z_ARG2, lock_offset, Z_SP); __ z_lgr(Z_ARG3, Z_thread); __ load_const_optimized(Z_R1_scratch, CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C)); __ call(Z_R1_scratch); #ifdef ASSERT { Label L; __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset())); __ z_bre(L); __ stop("no pending exception allowed on exit from IR::monitorexit"); __ bind(L); } #endif // Check_forward_pending_exception jump to forward_exception if any pending // exception is set. The forward_exception routine expects to see the // exception in pending_exception and not in a register. Kind of clumsy, // since all folks who branch to forward_exception must have tested // pending_exception first and hence have it in a register already. __ z_stg(R_exc, Address(Z_thread, Thread::pending_exception_offset())); restore_native_result(masm, ret_type, workspace_slot_offset); __ z_bru(done); __ z_illtrap(0x66); __ bind(done); } //-------------------------------------------------------------------- // Clear "last Java frame" SP and PC. //-------------------------------------------------------------------- __ reset_last_Java_frame(); // Unpack oop result, e.g. JNIHandles::resolve result. if (is_reference_type(ret_type)) { __ resolve_jobject(Z_RET, /* tmp1 */ Z_R13, /* tmp2 */ Z_R7); } if (CheckJNICalls) { // clear_pending_jni_exception_check __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop)); } // Reset handle block. __ z_lg(Z_R1_scratch, Address(Z_thread, JavaThread::active_handles_offset())); __ clear_mem(Address(Z_R1_scratch, JNIHandleBlock::top_offset()), 4); // Check for pending exceptions. __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset())); __ z_brne(handle_pending_exception); ////////////////////////////////////////////////////////////////////// // Return ////////////////////////////////////////////////////////////////////// #ifndef USE_RESIZE_FRAME __ pop_frame(); // Pop wrapper frame. #else __ resize_frame(frame_size_in_bytes, Z_R0_scratch); // Revert stack extension. #endif __ restore_return_pc(); // This is the way back to the caller. __ z_br(Z_R14); ////////////////////////////////////////////////////////////////////// // Out-of-line calls to the runtime. ////////////////////////////////////////////////////////////////////// //--------------------------------------------------------------------- // Handler for pending exceptions (out-of-line). //--------------------------------------------------------------------- // Since this is a native call, we know the proper exception handler // is the empty function. We just pop this frame and then jump to // forward_exception_entry. Z_R14 will contain the native caller's // return PC. __ bind(handle_pending_exception); __ pop_frame(); __ load_const_optimized(Z_R1_scratch, StubRoutines::forward_exception_entry()); __ restore_return_pc(); __ z_br(Z_R1_scratch); __ flush(); ////////////////////////////////////////////////////////////////////// // end of code generation ////////////////////////////////////////////////////////////////////// nmethod *nm = nmethod::new_native_nmethod(method, compile_id, masm->code(), (int)(wrapper_VEPStart-wrapper_CodeStart), (int)(wrapper_FrameDone-wrapper_CodeStart), stack_slots / VMRegImpl::slots_per_word, (method_is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)), in_ByteSize(lock_offset), oop_maps); return nm; } static address gen_c2i_adapter(MacroAssembler *masm, int comp_args_on_stack, const GrowableArray* sig, const VMRegPair *regs, Label &skip_fixup) { // Before we get into the guts of the C2I adapter, see if we should be here // at all. We've come from compiled code and are attempting to jump to the // interpreter, which means the caller made a static call to get here // (vcalls always get a compiled target if there is one). Check for a // compiled target. If there is one, we need to patch the caller's call. // These two defs MUST MATCH code in gen_i2c2i_adapter! const Register ientry = Z_R11; const Register code = Z_R11; address c2i_entrypoint; Label patch_callsite; // Regular (verified) c2i entry point. c2i_entrypoint = __ pc(); // Call patching needed? __ load_and_test_long(Z_R0_scratch, method_(code)); __ z_lg(ientry, method_(interpreter_entry)); // Preload interpreter entry (also if patching). __ z_brne(patch_callsite); // Patch required if code isn't null (compiled target exists). __ bind(skip_fixup); // Return point from patch_callsite. // Since all args are passed on the stack, total_args_passed*wordSize is the // space we need. We need ABI scratch area but we use the caller's since // it has already been allocated. int total_args_passed = sig->length(); const int abi_scratch = frame::z_top_ijava_frame_abi_size; int extraspace = align_up(total_args_passed, 2)*wordSize + abi_scratch; Register sender_SP = Z_R10; Register value = Z_R12; // Remember the senderSP so we can pop the interpreter arguments off of the stack. // In addition, template interpreter expects initial_caller_sp in Z_R10. __ z_lgr(sender_SP, Z_SP); // This should always fit in 14 bit immediate. __ resize_frame(-extraspace, Z_R0_scratch); // We use the caller's ABI scratch area (out_preserved_stack_slots) for the initial // args. This essentially moves the callers ABI scratch area from the top to the // bottom of the arg area. int st_off = extraspace - wordSize; // Now write the args into the outgoing interpreter space. for (int i = 0; i < total_args_passed; i++) { BasicType bt = sig->at(i)._bt; VMReg r_1 = regs[i].first(); VMReg r_2 = regs[i].second(); if (!r_1->is_valid()) { assert(!r_2->is_valid(), ""); continue; } if (r_1->is_stack()) { // The calling convention produces OptoRegs that ignore the preserve area (abi scratch). // We must account for it here. int ld_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; if (!r_2->is_valid()) { __ z_mvc(Address(Z_SP, st_off), Address(sender_SP, ld_off), sizeof(void*)); } else { // longs are given 2 64-bit slots in the interpreter, // but the data is passed in only 1 slot. if (bt == T_LONG || bt == T_DOUBLE) { #ifdef ASSERT __ clear_mem(Address(Z_SP, st_off), sizeof(void *)); #endif st_off -= wordSize; } __ z_mvc(Address(Z_SP, st_off), Address(sender_SP, ld_off), sizeof(void*)); } } else { if (r_1->is_Register()) { if (!r_2->is_valid()) { __ z_st(r_1->as_Register(), st_off, Z_SP); } else { // longs are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. if (bt == T_LONG || bt == T_DOUBLE) { #ifdef ASSERT __ clear_mem(Address(Z_SP, st_off), sizeof(void *)); #endif st_off -= wordSize; } __ z_stg(r_1->as_Register(), st_off, Z_SP); } } else { assert(r_1->is_FloatRegister(), ""); if (!r_2->is_valid()) { __ z_ste(r_1->as_FloatRegister(), st_off, Z_SP); } else { // In 64bit, doubles are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. // One of these should get known junk... #ifdef ASSERT __ z_lzdr(Z_F1); __ z_std(Z_F1, st_off, Z_SP); #endif st_off-=wordSize; __ z_std(r_1->as_FloatRegister(), st_off, Z_SP); } } } st_off -= wordSize; } // Jump to the interpreter just as if interpreter was doing it. __ add2reg(Z_esp, st_off, Z_SP); // Frame_manager expects initial_caller_sp (= SP without resize by c2i) in Z_R10. __ z_br(ientry); // Prevent illegal entry to out-of-line code. __ z_illtrap(0x22); // Generate out-of-line runtime call to patch caller, // then continue as interpreted. // IF you lose the race you go interpreted. // We don't see any possible endless c2i -> i2c -> c2i ... // transitions no matter how rare. __ bind(patch_callsite); RegisterSaver::save_live_registers(masm, RegisterSaver::arg_registers); __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite), Z_method, Z_R14); RegisterSaver::restore_live_registers(masm, RegisterSaver::arg_registers); __ z_bru(skip_fixup); // end of out-of-line code return c2i_entrypoint; } // On entry, the following registers are set // // Z_thread r8 - JavaThread* // Z_method r9 - callee's method (method to be invoked) // Z_esp r7 - operand (or expression) stack pointer of caller. one slot above last arg. // Z_SP r15 - SP prepared by call stub such that caller's outgoing args are near top // void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm, int comp_args_on_stack, const GrowableArray* sig, const VMRegPair *regs) { const Register value = Z_R12; const Register ld_ptr= Z_esp; int total_args_passed = sig->length(); int ld_offset = total_args_passed * wordSize; // Cut-out for having no stack args. if (comp_args_on_stack) { // Sig words on the stack are greater than VMRegImpl::stack0. Those in // registers are below. By subtracting stack0, we either get a negative // number (all values in registers) or the maximum stack slot accessed. // Convert VMRegImpl (4 byte) stack slots to words. int comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord; // Round up to miminum stack alignment, in wordSize comp_words_on_stack = align_up(comp_words_on_stack, 2); __ resize_frame(-comp_words_on_stack*wordSize, Z_R0_scratch); } // Now generate the shuffle code. Pick up all register args and move the // rest through register value=Z_R12. for (int i = 0; i < total_args_passed; i++) { BasicType bt = sig->at(i)._bt; if (bt == T_VOID) { assert(i > 0 && (sig->at(i - 1)._bt == T_LONG || sig->at(i - 1)._bt == T_DOUBLE), "missing half"); continue; } // Pick up 0, 1 or 2 words from ld_ptr. assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), "scrambled load targets?"); VMReg r_1 = regs[i].first(); VMReg r_2 = regs[i].second(); if (!r_1->is_valid()) { assert(!r_2->is_valid(), ""); continue; } if (r_1->is_FloatRegister()) { if (!r_2->is_valid()) { __ z_le(r_1->as_FloatRegister(), ld_offset, ld_ptr); ld_offset-=wordSize; } else { // Skip the unused interpreter slot. __ z_ld(r_1->as_FloatRegister(), ld_offset - wordSize, ld_ptr); ld_offset -= 2 * wordSize; } } else { if (r_1->is_stack()) { // Must do a memory to memory move. int st_off = (r_1->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size; if (!r_2->is_valid()) { __ z_mvc(Address(Z_SP, st_off), Address(ld_ptr, ld_offset), sizeof(void*)); } else { // In 64bit, longs are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. if (bt == T_LONG || bt == T_DOUBLE) { ld_offset -= wordSize; } __ z_mvc(Address(Z_SP, st_off), Address(ld_ptr, ld_offset), sizeof(void*)); } } else { if (!r_2->is_valid()) { // Not sure we need to do this but it shouldn't hurt. if (is_reference_type(bt) || bt == T_ADDRESS) { __ z_lg(r_1->as_Register(), ld_offset, ld_ptr); } else { __ z_l(r_1->as_Register(), ld_offset, ld_ptr); } } else { // In 64bit, longs are given 2 64-bit slots in the interpreter, but the // data is passed in only 1 slot. if (bt == T_LONG || bt == T_DOUBLE) { ld_offset -= wordSize; } __ z_lg(r_1->as_Register(), ld_offset, ld_ptr); } } ld_offset -= wordSize; } } // Jump to the compiled code just as if compiled code was doing it. // load target address from method: __ z_lg(Z_R1_scratch, Address(Z_method, Method::from_compiled_offset())); // Store method into thread->callee_target. // 6243940: We might end up in handle_wrong_method if // the callee is deoptimized as we race thru here. If that // happens we don't want to take a safepoint because the // caller frame will look interpreted and arguments are now // "compiled" so it is much better to make this transition // invisible to the stack walking code. Unfortunately, if // we try and find the callee by normal means a safepoint // is possible. So we stash the desired callee in the thread // and the vm will find it there should this case occur. __ z_stg(Z_method, thread_(callee_target)); __ z_br(Z_R1_scratch); } void SharedRuntime::generate_i2c2i_adapters(MacroAssembler* masm, int comp_args_on_stack, const GrowableArray* sig, const VMRegPair* regs, const GrowableArray* sig_cc, const VMRegPair* regs_cc, const GrowableArray* sig_cc_ro, const VMRegPair* regs_cc_ro, address entry_address[AdapterBlob::ENTRY_COUNT], AdapterBlob*& new_adapter, bool allocate_code_blob) { __ align(CodeEntryAlignment); entry_address[AdapterBlob::I2C] = __ pc(); gen_i2c_adapter(masm, comp_args_on_stack, sig, regs); Label skip_fixup; { Label ic_miss; // Out-of-line call to ic_miss handler. __ call_ic_miss_handler(ic_miss, 0x11, 0, Z_R1_scratch); // Unverified Entry Point UEP __ align(CodeEntryAlignment); entry_address[AdapterBlob::C2I_Unverified] = __ pc(); __ ic_check(2); __ z_lg(Z_method, Address(Z_inline_cache, CompiledICData::speculated_method_offset())); // This def MUST MATCH code in gen_c2i_adapter! const Register code = Z_R11; __ load_and_test_long(Z_R0, method_(code)); __ z_brne(ic_miss); // Cache miss: call runtime to handle this. // Fallthru to VEP. Duplicate LTG, but saved taken branch. } entry_address[AdapterBlob::C2I] = __ pc(); // Class initialization barrier for static methods entry_address[AdapterBlob::C2I_No_Clinit_Check] = nullptr; assert(VM_Version::supports_fast_class_init_checks(), "sanity"); Label L_skip_barrier; // Bypass the barrier for non-static methods __ testbit_ushort(Address(Z_method, Method::access_flags_offset()), JVM_ACC_STATIC_BIT); __ z_bfalse(L_skip_barrier); // non-static Register klass = Z_R11; __ load_method_holder(klass, Z_method); __ clinit_barrier(klass, Z_thread, &L_skip_barrier /*L_fast_path*/); __ load_const_optimized(klass, SharedRuntime::get_handle_wrong_method_stub()); __ z_br(klass); __ bind(L_skip_barrier); entry_address[AdapterBlob::C2I_No_Clinit_Check] = __ pc(); gen_c2i_adapter(masm, comp_args_on_stack, sig, regs, skip_fixup); return; } // This function returns the adjust size (in number of words) to a c2i adapter // activation for use during deoptimization. // // Actually only compiled frames need to be adjusted, but it // doesn't harm to adjust entry and interpreter frames, too. // int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) { assert(callee_locals >= callee_parameters, "test and remove; got more parms than locals"); // Handle the abi adjustment here instead of doing it in push_skeleton_frames. return (callee_locals - callee_parameters) * Interpreter::stackElementWords + frame::z_parent_ijava_frame_abi_size / BytesPerWord; } uint SharedRuntime::in_preserve_stack_slots() { return frame::jit_in_preserve_size_in_4_byte_units; } uint SharedRuntime::out_preserve_stack_slots() { return frame::z_jit_out_preserve_size/VMRegImpl::stack_slot_size; } VMReg SharedRuntime::thread_register() { Unimplemented(); return nullptr; } // // Frame generation for deopt and uncommon trap blobs. // static void push_skeleton_frame(MacroAssembler* masm, /* Unchanged */ Register frame_sizes_reg, Register pcs_reg, /* Invalidate */ Register frame_size_reg, Register pc_reg) { BLOCK_COMMENT(" push_skeleton_frame {"); __ z_lg(pc_reg, 0, pcs_reg); __ z_lg(frame_size_reg, 0, frame_sizes_reg); __ z_stg(pc_reg, _z_abi(return_pc), Z_SP); Register fp = pc_reg; __ push_frame(frame_size_reg, fp); #ifdef ASSERT // The magic is required for successful walking skeletal frames. __ load_const_optimized(frame_size_reg/*tmp*/, frame::z_istate_magic_number); __ z_stg(frame_size_reg, _z_ijava_state_neg(magic), fp); // Fill other slots that are supposedly not necessary with eye catchers. __ load_const_optimized(frame_size_reg/*use as tmp*/, 0xdeadbad1); __ z_stg(frame_size_reg, _z_ijava_state_neg(top_frame_sp), fp); // The sender_sp of the bottom frame is set before pushing it. // The sender_sp of non bottom frames is their caller's top_frame_sp, which // is unknown here. Luckily it is not needed before filling the frame in // layout_activation(), we assert this by setting an eye catcher (see // comments on sender_sp in frame_s390.hpp). __ z_stg(frame_size_reg, _z_ijava_state_neg(sender_sp), Z_SP); #endif // ASSERT BLOCK_COMMENT(" } push_skeleton_frame"); } // Loop through the UnrollBlock info and create new frames. static void push_skeleton_frames(MacroAssembler* masm, bool deopt, /* read */ Register unroll_block_reg, /* invalidate */ Register frame_sizes_reg, Register number_of_frames_reg, Register pcs_reg, Register tmp1, Register tmp2) { BLOCK_COMMENT("push_skeleton_frames {"); // _number_of_frames is of type int (deoptimization.hpp). __ z_lgf(number_of_frames_reg, Address(unroll_block_reg, Deoptimization::UnrollBlock::number_of_frames_offset())); __ z_lg(pcs_reg, Address(unroll_block_reg, Deoptimization::UnrollBlock::frame_pcs_offset())); __ z_lg(frame_sizes_reg, Address(unroll_block_reg, Deoptimization::UnrollBlock::frame_sizes_offset())); // stack: (caller_of_deoptee, ...). // If caller_of_deoptee is a compiled frame, then we extend it to make // room for the callee's locals and the frame::z_parent_ijava_frame_abi. // See also Deoptimization::last_frame_adjust() above. // Note: entry and interpreted frames are adjusted, too. But this doesn't harm. __ z_lgf(Z_R1_scratch, Address(unroll_block_reg, Deoptimization::UnrollBlock::caller_adjustment_offset())); __ z_lgr(tmp1, Z_SP); // Save the sender sp before extending the frame. __ resize_frame_sub(Z_R1_scratch, tmp2/*tmp*/); // The oldest skeletal frame requires a valid sender_sp to make it walkable // (it is required to find the original pc of caller_of_deoptee if it is marked // for deoptimization - see nmethod::orig_pc_addr()). __ z_stg(tmp1, _z_ijava_state_neg(sender_sp), Z_SP); // Now push the new interpreter frames. Label loop, loop_entry; // Make sure that there is at least one entry in the array. DEBUG_ONLY(__ z_ltgr(number_of_frames_reg, number_of_frames_reg)); __ asm_assert(Assembler::bcondNotZero, "array_size must be > 0", 0x205); __ z_bru(loop_entry); __ bind(loop); __ add2reg(frame_sizes_reg, wordSize); __ add2reg(pcs_reg, wordSize); __ bind(loop_entry); // Allocate a new frame, fill in the pc. push_skeleton_frame(masm, frame_sizes_reg, pcs_reg, tmp1, tmp2); __ z_aghi(number_of_frames_reg, -1); // Emit AGHI, because it sets the condition code __ z_brne(loop); // Set the top frame's return pc. __ add2reg(pcs_reg, wordSize); __ z_lg(Z_R0_scratch, 0, pcs_reg); __ z_stg(Z_R0_scratch, _z_abi(return_pc), Z_SP); BLOCK_COMMENT("} push_skeleton_frames"); } //------------------------------generate_deopt_blob---------------------------- void SharedRuntime::generate_deopt_blob() { // Allocate space for the code. ResourceMark rm; // Setup code generation tools. const char* name = SharedRuntime::stub_name(StubId::shared_deopt_id); CodeBuffer buffer(name, 2048, 1024); InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer); Label exec_mode_initialized; OopMap* map = nullptr; OopMapSet *oop_maps = new OopMapSet(); unsigned int start_off = __ offset(); Label cont; // -------------------------------------------------------------------------- // Normal entry (non-exception case) // // We have been called from the deopt handler of the deoptee. // Z_R14 points to the entry point of the deopt handler. // The return_pc has been stored in the frame of the deoptee and // will replace the address of the deopt_handler in the call // to Deoptimization::fetch_unroll_info below. const Register exec_mode_reg = Z_tmp_1; // stack: (deoptee, caller of deoptee, ...) // pushes an "unpack" frame // R14 contains the return address pointing into the deoptimized // nmethod that was valid just before the nmethod was deoptimized. // save R14 into the deoptee frame. the `fetch_unroll_info' // procedure called below will read it from there. map = RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers); // note the entry point. __ load_const_optimized(exec_mode_reg, Deoptimization::Unpack_deopt); __ z_bru(exec_mode_initialized); #ifndef COMPILER1 int reexecute_offset = 1; // odd offset will produce odd pc, which triggers an hardware trap #else // -------------------------------------------------------------------------- // Reexecute entry // - Z_R14 = Deopt Handler in nmethod int reexecute_offset = __ offset() - start_off; // No need to update map as each call to save_live_registers will produce identical oopmap (void) RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers); __ load_const_optimized(exec_mode_reg, Deoptimization::Unpack_reexecute); __ z_bru(exec_mode_initialized); #endif // -------------------------------------------------------------------------- // Exception entry. We reached here via a branch. Registers on entry: // - Z_EXC_OOP (Z_ARG1) = exception oop // - Z_EXC_PC (Z_ARG2) = the exception pc. int exception_offset = __ offset() - start_off; // all registers are dead at this entry point, except for Z_EXC_OOP, and // Z_EXC_PC which contain the exception oop and exception pc // respectively. Set them in TLS and fall thru to the // unpack_with_exception_in_tls entry point. // Store exception oop and pc in thread (location known to GC). // Need this since the call to "fetch_unroll_info()" may safepoint. __ z_stg(Z_EXC_OOP, Address(Z_thread, JavaThread::exception_oop_offset())); __ z_stg(Z_EXC_PC, Address(Z_thread, JavaThread::exception_pc_offset())); // fall through int exception_in_tls_offset = __ offset() - start_off; // new implementation because exception oop is now passed in JavaThread // Prolog for exception case // All registers must be preserved because they might be used by LinearScan // Exceptiop oop and throwing PC are passed in JavaThread // load throwing pc from JavaThread and us it as the return address of the current frame. __ z_lg(Z_R1_scratch, Address(Z_thread, JavaThread::exception_pc_offset())); // Save everything in sight. (void) RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers, Z_R1_scratch); // Now it is safe to overwrite any register // Clear the exception pc field in JavaThread __ clear_mem(Address(Z_thread, JavaThread::exception_pc_offset()), 8); // Deopt during an exception. Save exec mode for unpack_frames. __ load_const_optimized(exec_mode_reg, Deoptimization::Unpack_exception); #ifdef ASSERT // verify that there is really an exception oop in JavaThread __ z_lg(Z_ARG1, Address(Z_thread, JavaThread::exception_oop_offset())); __ MacroAssembler::verify_oop(Z_ARG1, FILE_AND_LINE); // verify that there is no pending exception __ asm_assert_mem8_is_zero(in_bytes(Thread::pending_exception_offset()), Z_thread, "must not have pending exception here", __LINE__); #endif // -------------------------------------------------------------------------- // At this point, the live registers are saved and // the exec_mode_reg has been set up correctly. __ bind(exec_mode_initialized); // stack: ("unpack" frame, deoptee, caller_of_deoptee, ...). const Register unroll_block_reg = Z_tmp_2; // we need to set `last_Java_frame' because `fetch_unroll_info' will // call `last_Java_frame()'. however we can't block and no gc will // occur so we don't need an oopmap. the value of the pc in the // frame is not particularly important. it just needs to identify the blob. // Don't set last_Java_pc anymore here (is implicitly null then). // the correct PC is retrieved in pd_last_frame() in that case. __ set_last_Java_frame(/*sp*/Z_SP, noreg); // With EscapeAnalysis turned on, this call may safepoint // despite it's marked as "leaf call"! __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info), Z_thread, exec_mode_reg); // Set an oopmap for the call site this describes all our saved volatile registers int oop_map_offs = __ offset(); oop_maps->add_gc_map(oop_map_offs, map); __ reset_last_Java_frame(); // save the return value. __ z_lgr(unroll_block_reg, Z_RET); // restore the return registers that have been saved // (among other registers) by save_live_registers(...). RegisterSaver::restore_result_registers(masm); // reload the exec mode from the UnrollBlock (it might have changed) __ z_llgf(exec_mode_reg, Address(unroll_block_reg, Deoptimization::UnrollBlock::unpack_kind_offset())); // In excp_deopt_mode, restore and clear exception oop which we // stored in the thread during exception entry above. The exception // oop will be the return value of this stub. NearLabel skip_restore_excp; __ compare64_and_branch(exec_mode_reg, Deoptimization::Unpack_exception, Assembler::bcondNotEqual, skip_restore_excp); __ z_lg(Z_RET, thread_(exception_oop)); __ clear_mem(thread_(exception_oop), 8); __ bind(skip_restore_excp); // remove the "unpack" frame __ pop_frame(); // stack: (deoptee, caller of deoptee, ...). // pop the deoptee's frame __ pop_frame(); // stack: (caller_of_deoptee, ...). // loop through the `UnrollBlock' info and create interpreter frames. push_skeleton_frames(masm, true/*deopt*/, unroll_block_reg, Z_tmp_3, Z_tmp_4, Z_ARG5, Z_ARG4, Z_ARG3); // stack: (skeletal interpreter frame, ..., optional skeletal // interpreter frame, caller of deoptee, ...). // push an "unpack" frame taking care of float / int return values. __ push_frame(RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers)); // stack: (unpack frame, skeletal interpreter frame, ..., optional // skeletal interpreter frame, caller of deoptee, ...). // spill live volatile registers since we'll do a call. __ z_stg(Z_RET, offset_of(frame::z_abi_160_spill, spill[0]), Z_SP); __ z_std(Z_FRET, offset_of(frame::z_abi_160_spill, spill[1]), Z_SP); // let the unpacker layout information in the skeletal frames just allocated. __ get_PC(Z_RET, oop_map_offs - __ offset()); __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_RET); __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), Z_thread/*thread*/, exec_mode_reg/*exec_mode*/); __ reset_last_Java_frame(); // restore the volatiles saved above. __ z_lg(Z_RET, offset_of(frame::z_abi_160_spill, spill[0]), Z_SP); __ z_ld(Z_FRET, offset_of(frame::z_abi_160_spill, spill[1]), Z_SP); // pop the "unpack" frame. __ pop_frame(); __ restore_return_pc(); // stack: (top interpreter frame, ..., optional interpreter frame, // caller of deoptee, ...). __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // restore frame pointer __ restore_bcp(); __ restore_locals(); __ restore_esp(); // return to the interpreter entry point. __ z_br(Z_R14); // Make sure all code is generated masm->flush(); _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers)/wordSize); _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset); } #ifdef COMPILER2 //------------------------------generate_uncommon_trap_blob-------------------- UncommonTrapBlob* OptoRuntime::generate_uncommon_trap_blob() { // Allocate space for the code ResourceMark rm; // Setup code generation tools const char* name = OptoRuntime::stub_name(StubId::c2_uncommon_trap_id); CodeBuffer buffer(name, 2048, 1024); if (buffer.blob() == nullptr) { return nullptr; } InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer); Register unroll_block_reg = Z_tmp_1; Register klass_index_reg = Z_ARG2; Register unc_trap_reg = Z_ARG2; // stack: (deoptee, caller_of_deoptee, ...). // push a dummy "unpack" frame and call // `Deoptimization::uncommon_trap' to pack the compiled frame into a // vframe array and return the `UnrollBlock' information. // save R14 to compiled frame. __ save_return_pc(); // push the "unpack_frame". __ push_frame_abi160(0); // stack: (unpack frame, deoptee, caller_of_deoptee, ...). // set the "unpack" frame as last_Java_frame. // `Deoptimization::uncommon_trap' expects it and considers its // sender frame as the deoptee frame. __ get_PC(Z_R1_scratch); __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_R1_scratch); __ z_lgr(klass_index_reg, Z_ARG1); // passed implicitly as ARG2 __ z_lghi(Z_ARG3, Deoptimization::Unpack_uncommon_trap); // passed implicitly as ARG3 BLOCK_COMMENT("call Deoptimization::uncommon_trap()"); __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap), Z_thread); __ reset_last_Java_frame(); // pop the "unpack" frame __ pop_frame(); // stack: (deoptee, caller_of_deoptee, ...). // save the return value. __ z_lgr(unroll_block_reg, Z_RET); // pop the deoptee frame. __ pop_frame(); // stack: (caller_of_deoptee, ...). #ifdef ASSERT assert(Immediate::is_uimm8(Deoptimization::Unpack_LIMIT), "Code not fit for larger immediates"); assert(Immediate::is_uimm8(Deoptimization::Unpack_uncommon_trap), "Code not fit for larger immediates"); const int unpack_kind_byte_offset = in_bytes(Deoptimization::UnrollBlock::unpack_kind_offset()) #ifndef VM_LITTLE_ENDIAN + 3 #endif ; if (Displacement::is_shortDisp(unpack_kind_byte_offset)) { __ z_cli(unpack_kind_byte_offset, unroll_block_reg, Deoptimization::Unpack_uncommon_trap); } else { __ z_cliy(unpack_kind_byte_offset, unroll_block_reg, Deoptimization::Unpack_uncommon_trap); } __ asm_assert(Assembler::bcondEqual, "OptoRuntime::generate_deopt_blob: expected Unpack_uncommon_trap", 0); #endif __ zap_from_to(Z_SP, Z_SP, Z_R0_scratch, Z_R1, 500, -1); // allocate new interpreter frame(s) and possibly resize the caller's frame // (no more adapters !) push_skeleton_frames(masm, false/*deopt*/, unroll_block_reg, Z_tmp_2, Z_tmp_3, Z_tmp_4, Z_ARG5, Z_ARG4); // stack: (skeletal interpreter frame, ..., optional skeletal // interpreter frame, (resized) caller of deoptee, ...). // push a dummy "unpack" frame taking care of float return values. // call `Deoptimization::unpack_frames' to layout information in the // interpreter frames just created // push the "unpack" frame const unsigned int framesize_in_bytes = __ push_frame_abi160(0); // stack: (unpack frame, skeletal interpreter frame, ..., optional // skeletal interpreter frame, (resized) caller of deoptee, ...). // set the "unpack" frame as last_Java_frame __ get_PC(Z_R1_scratch); __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_R1_scratch); // indicate it is the uncommon trap case BLOCK_COMMENT("call Deoptimization::Unpack_uncommon_trap()"); __ load_const_optimized(unc_trap_reg, Deoptimization::Unpack_uncommon_trap); // let the unpacker layout information in the skeletal frames just allocated. __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), Z_thread); __ reset_last_Java_frame(); // pop the "unpack" frame __ pop_frame(); // restore LR from top interpreter frame __ restore_return_pc(); // stack: (top interpreter frame, ..., optional interpreter frame, // (resized) caller of deoptee, ...). __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // restore frame pointer __ restore_bcp(); __ restore_locals(); __ restore_esp(); // return to the interpreter entry point __ z_br(Z_R14); masm->flush(); return UncommonTrapBlob::create(&buffer, nullptr, framesize_in_bytes/wordSize); } #endif // COMPILER2 //------------------------------generate_handler_blob------ // // Generate a special Compile2Runtime blob that saves all registers, // and setup oopmap. SafepointBlob* SharedRuntime::generate_handler_blob(StubId id, address call_ptr) { assert(StubRoutines::forward_exception_entry() != nullptr, "must be generated before"); assert(is_polling_page_id(id), "expected a polling page stub id"); ResourceMark rm; OopMapSet *oop_maps = new OopMapSet(); OopMap* map; // Allocate space for the code. Setup code generation tools. const char* name = SharedRuntime::stub_name(id); CodeBuffer buffer(name, 2048, 1024); MacroAssembler* masm = new MacroAssembler(&buffer); unsigned int start_off = __ offset(); address call_pc = nullptr; int frame_size_in_bytes; bool cause_return = (id == StubId::shared_polling_page_return_handler_id); // Make room for return address (or push it again) if (!cause_return) { __ z_lg(Z_R14, Address(Z_thread, JavaThread::saved_exception_pc_offset())); } bool save_vectors = (id == StubId::shared_polling_page_vectors_safepoint_handler_id); // Save registers, fpu state, and flags map = RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers, Z_R14, save_vectors); if (!cause_return) { // Keep a copy of the return pc to detect if it gets modified. __ z_lgr(Z_R6, Z_R14); } // The following is basically a call_VM. However, we need the precise // address of the call in order to generate an oopmap. Hence, we do all the // work ourselves. __ set_last_Java_frame(Z_SP, noreg); // call into the runtime to handle the safepoint poll __ call_VM_leaf(call_ptr, Z_thread); // Set an oopmap for the call site. This oopmap will map all // oop-registers and debug-info registers as callee-saved. This // will allow deoptimization at this safepoint to find all possible // debug-info recordings, as well as let GC find all oops. oop_maps->add_gc_map((int)(__ offset()-start_off), map); Label noException; __ reset_last_Java_frame(); __ load_and_test_long(Z_R1, thread_(pending_exception)); __ z_bre(noException); // Pending exception case, used (sporadically) by // api/java_lang/Thread.State/index#ThreadState et al. RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers, save_vectors); // Jump to forward_exception_entry, with the issuing PC in Z_R14 // so it looks like the original nmethod called forward_exception_entry. __ load_const_optimized(Z_R1_scratch, StubRoutines::forward_exception_entry()); __ z_br(Z_R1_scratch); // No exception case __ bind(noException); if (!cause_return) { Label no_adjust; // If our stashed return pc was modified by the runtime we avoid touching it const int offset_of_return_pc = _z_common_abi(return_pc) + RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers, save_vectors); __ z_cg(Z_R6, offset_of_return_pc, Z_SP); __ z_brne(no_adjust); // Adjust return pc forward to step over the safepoint poll instruction __ instr_size(Z_R1_scratch, Z_R6); __ z_agr(Z_R6, Z_R1_scratch); __ z_stg(Z_R6, offset_of_return_pc, Z_SP); __ bind(no_adjust); } // Normal exit, restore registers and exit. RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers, save_vectors); __ z_br(Z_R14); // Make sure all code is generated masm->flush(); // Fill-out other meta info return SafepointBlob::create(&buffer, oop_maps, RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers, save_vectors)/wordSize); } // // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss // // Generate a stub that calls into vm to find out the proper destination // of a Java call. All the argument registers are live at this point // but since this is generic code we don't know what they are and the caller // must do any gc of the args. // RuntimeStub* SharedRuntime::generate_resolve_blob(StubId id, address destination) { assert (StubRoutines::forward_exception_entry() != nullptr, "must be generated before"); assert(is_resolve_id(id), "expected a resolve stub id"); // allocate space for the code ResourceMark rm; const char* name = SharedRuntime::stub_name(id); CodeBuffer buffer(name, 1000, 512); MacroAssembler* masm = new MacroAssembler(&buffer); OopMapSet *oop_maps = new OopMapSet(); OopMap* map = nullptr; unsigned int start_off = __ offset(); map = RegisterSaver::save_live_registers(masm, RegisterSaver::all_registers); // We must save a PC from within the stub as return PC // C code doesn't store the LR where we expect the PC, // so we would run into trouble upon stack walking. __ get_PC(Z_R1_scratch); unsigned int frame_complete = __ offset(); __ set_last_Java_frame(/*sp*/Z_SP, Z_R1_scratch); __ call_VM_leaf(destination, Z_thread, Z_method); // Set an oopmap for the call site. // We need this not only for callee-saved registers, but also for volatile // registers that the compiler might be keeping live across a safepoint. oop_maps->add_gc_map((int)(frame_complete-start_off), map); // clear last_Java_sp __ reset_last_Java_frame(); // check for pending exceptions Label pending; __ load_and_test_long(Z_R0, Address(Z_thread, Thread::pending_exception_offset())); __ z_brne(pending); __ z_lgr(Z_R1_scratch, Z_R2); // r1 is neither saved nor restored, r2 contains the continuation. RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers); // get the returned method __ get_vm_result_metadata(Z_method); // We are back to the original state on entry and ready to go. __ z_br(Z_R1_scratch); // Pending exception after the safepoint __ bind(pending); RegisterSaver::restore_live_registers(masm, RegisterSaver::all_registers); // exception pending => remove activation and forward to exception handler __ z_lgr(Z_R2, Z_R0); // pending_exception __ clear_mem(Address(Z_thread, JavaThread::vm_result_oop_offset()), sizeof(jlong)); __ load_const_optimized(Z_R1_scratch, StubRoutines::forward_exception_entry()); __ z_br(Z_R1_scratch); // ------------- // make sure all code is generated masm->flush(); // return the blob // frame_size_words or bytes?? return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, RegisterSaver::live_reg_frame_size(RegisterSaver::all_registers)/wordSize, oop_maps, true); } // Continuation point for throwing of implicit exceptions that are // not handled in the current activation. Fabricates an exception // oop and initiates normal exception dispatching in this // frame. Only callee-saved registers are preserved (through the // normal RegisterMap handling). If the compiler // needs all registers to be preserved between the fault point and // the exception handler then it must assume responsibility for that // in AbstractCompiler::continuation_for_implicit_null_exception or // continuation_for_implicit_division_by_zero_exception. All other // implicit exceptions (e.g., NullPointerException or // AbstractMethodError on entry) are either at call sites or // otherwise assume that stack unwinding will be initiated, so // caller saved registers were assumed volatile in the compiler. // Note that we generate only this stub into a RuntimeStub, because // it needs to be properly traversed and ignored during GC, so we // change the meaning of the "__" macro within this method. // Note: the routine set_pc_not_at_call_for_caller in // SharedRuntime.cpp requires that this code be generated into a // RuntimeStub. RuntimeStub* SharedRuntime::generate_throw_exception(StubId id, address runtime_entry) { assert(is_throw_id(id), "expected a throw stub id"); const char* name = SharedRuntime::stub_name(id); int insts_size = 256; int locs_size = 0; ResourceMark rm; const char* timer_msg = "SharedRuntime generate_throw_exception"; TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime)); CodeBuffer code(name, insts_size, locs_size); MacroAssembler* masm = new MacroAssembler(&code); int framesize_in_bytes; address start = __ pc(); __ save_return_pc(); framesize_in_bytes = __ push_frame_abi160(0); address frame_complete_pc = __ pc(); // Note that we always have a runtime stub frame on the top of stack at this point. __ get_PC(Z_R1); __ set_last_Java_frame(/*sp*/Z_SP, /*pc*/Z_R1); // Do the call. BLOCK_COMMENT("call runtime_entry"); __ call_VM_leaf(runtime_entry, Z_thread); __ reset_last_Java_frame(); #ifdef ASSERT // Make sure that this code is only executed if there is a pending exception. { Label L; __ z_lg(Z_R0, in_bytes(Thread::pending_exception_offset()), Z_thread); __ z_ltgr(Z_R0, Z_R0); __ z_brne(L); __ stop("SharedRuntime::throw_exception: no pending exception"); __ bind(L); } #endif __ pop_frame(); __ restore_return_pc(); __ load_const_optimized(Z_R1, StubRoutines::forward_exception_entry()); __ z_br(Z_R1); RuntimeStub* stub = RuntimeStub::new_runtime_stub(name, &code, frame_complete_pc - start, framesize_in_bytes/wordSize, nullptr /*oop_maps*/, false); return stub; } //------------------------------Montgomery multiplication------------------------ // // Subtract 0:b from carry:a. Return carry. static unsigned long sub(unsigned long a[], unsigned long b[], unsigned long carry, long len) { unsigned long i, c = 8 * (unsigned long)(len - 1); __asm__ __volatile__ ( "SLGR %[i], %[i] \n" // initialize to 0 and pre-set carry "LGHI 0, 8 \n" // index increment (for BRXLG) "LGR 1, %[c] \n" // index limit (for BRXLG) "0: \n" "LG %[c], 0(%[i],%[a]) \n" "SLBG %[c], 0(%[i],%[b]) \n" // subtract with borrow "STG %[c], 0(%[i],%[a]) \n" "BRXLG %[i], 0, 0b \n" // while ((i+=8) 0) { d--; unsigned long s_val = *s; // Swap words in a longword on little endian machines. #ifdef VM_LITTLE_ENDIAN Unimplemented(); #endif *d = s_val; s++; } } void SharedRuntime::montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints, jint len, jlong inv, jint *m_ints) { len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls. assert(len % 2 == 0, "array length in montgomery_multiply must be even"); int longwords = len/2; // Make very sure we don't use so much space that the stack might // overflow. 512 jints corresponds to an 16384-bit integer and // will use here a total of 8k bytes of stack space. int divisor = sizeof(unsigned long) * 4; guarantee(longwords <= 8192 / divisor, "must be"); int total_allocation = longwords * sizeof (unsigned long) * 4; unsigned long *scratch = (unsigned long *)alloca(total_allocation); // Local scratch arrays unsigned long *a = scratch + 0 * longwords, *b = scratch + 1 * longwords, *n = scratch + 2 * longwords, *m = scratch + 3 * longwords; reverse_words((unsigned long *)a_ints, a, longwords); reverse_words((unsigned long *)b_ints, b, longwords); reverse_words((unsigned long *)n_ints, n, longwords); ::montgomery_multiply(a, b, n, m, (unsigned long)inv, longwords); reverse_words(m, (unsigned long *)m_ints, longwords); } void SharedRuntime::montgomery_square(jint *a_ints, jint *n_ints, jint len, jlong inv, jint *m_ints) { len = len & 0x7fffFFFF; // C2 does not respect int to long conversion for stub calls. assert(len % 2 == 0, "array length in montgomery_square must be even"); int longwords = len/2; // Make very sure we don't use so much space that the stack might // overflow. 512 jints corresponds to an 16384-bit integer and // will use here a total of 6k bytes of stack space. int divisor = sizeof(unsigned long) * 3; guarantee(longwords <= (8192 / divisor), "must be"); int total_allocation = longwords * sizeof (unsigned long) * 3; unsigned long *scratch = (unsigned long *)alloca(total_allocation); // Local scratch arrays unsigned long *a = scratch + 0 * longwords, *n = scratch + 1 * longwords, *m = scratch + 2 * longwords; reverse_words((unsigned long *)a_ints, a, longwords); reverse_words((unsigned long *)n_ints, n, longwords); if (len >= MONTGOMERY_SQUARING_THRESHOLD) { ::montgomery_square(a, n, m, (unsigned long)inv, longwords); } else { ::montgomery_multiply(a, a, n, m, (unsigned long)inv, longwords); } reverse_words(m, (unsigned long *)m_ints, longwords); } extern "C" int SpinPause() { return 0; } #if INCLUDE_JFR RuntimeStub* SharedRuntime::generate_jfr_write_checkpoint() { if (!Continuations::enabled()) return nullptr; Unimplemented(); return nullptr; } RuntimeStub* SharedRuntime::generate_jfr_return_lease() { if (!Continuations::enabled()) return nullptr; Unimplemented(); return nullptr; } #endif // INCLUDE_JFR const uint SharedRuntime::java_return_convention_max_int = Argument::n_int_register_parameters_j; const uint SharedRuntime::java_return_convention_max_float = Argument::n_float_register_parameters_j; int SharedRuntime::java_return_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed) { Unimplemented(); return 0; } BufferedInlineTypeBlob* SharedRuntime::generate_buffered_inline_type_adapter(const InlineKlass* vk) { Unimplemented(); return nullptr; }