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Diffstat (limited to 'deps/v8/src/heap/base/asm/x64/push_registers_asm.cc')
-rw-r--r-- | deps/v8/src/heap/base/asm/x64/push_registers_asm.cc | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc b/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc new file mode 100644 index 0000000000..1781a5816a --- /dev/null +++ b/deps/v8/src/heap/base/asm/x64/push_registers_asm.cc @@ -0,0 +1,106 @@ +// Copyright 2020 the V8 project authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// Push all callee-saved registers to get them on the stack for conservative +// stack scanning. +// +// We cannot rely on clang generating the function and right symbol mangling +// as `__attribute__((naked))` does not prevent clang from generating TSAN +// function entry stubs (`__tsan_func_entry`). Even with +// `__attribute__((no_sanitize_thread)` annotation clang generates the entry +// stub. +// See https://bugs.llvm.org/show_bug.cgi?id=45400. + +// Do not depend on V8_TARGET_OS_* defines as some embedders may override the +// GN toolchain (e.g. ChromeOS) and not provide them. +// _WIN64 Defined as 1 when the compilation target is 64-bit ARM or x64. +// Otherwise, undefined. +#ifdef _WIN64 + +// We maintain 16-byte alignment at calls. There is an 8-byte return address +// on the stack and we push 232 bytes which maintains 16-byte stack alignment +// at the call. +// Source: https://docs.microsoft.com/en-us/cpp/build/x64-calling-convention +asm(".globl PushAllRegistersAndIterateStack \n" + "PushAllRegistersAndIterateStack: \n" + // rbp is callee-saved. Maintain proper frame pointer for debugging. + " push %rbp \n" + " mov %rsp, %rbp \n" + // Dummy for alignment. + " push $0xCDCDCD \n" + " push %rsi \n" + " push %rdi \n" + " push %rbx \n" + " push %r12 \n" + " push %r13 \n" + " push %r14 \n" + " push %r15 \n" + " sub $160, %rsp \n" + // Use aligned instrs as we are certain that the stack is properly aligned. + " movdqa %xmm6, 144(%rsp) \n" + " movdqa %xmm7, 128(%rsp) \n" + " movdqa %xmm8, 112(%rsp) \n" + " movdqa %xmm9, 96(%rsp) \n" + " movdqa %xmm10, 80(%rsp) \n" + " movdqa %xmm11, 64(%rsp) \n" + " movdqa %xmm12, 48(%rsp) \n" + " movdqa %xmm13, 32(%rsp) \n" + " movdqa %xmm14, 16(%rsp) \n" + " movdqa %xmm15, (%rsp) \n" + // Pass 1st parameter (rcx) unchanged (Stack*). + // Pass 2nd parameter (rdx) unchanged (StackVisitor*). + // Save 3rd parameter (r8; IterateStackCallback) + " mov %r8, %r9 \n" + // Pass 3rd parameter as rsp (stack pointer). + " mov %rsp, %r8 \n" + // Call the callback. + " call *%r9 \n" + // Pop the callee-saved registers. + " add $224, %rsp \n" + // Restore rbp as it was used as frame pointer. + " pop %rbp \n" + " ret \n"); + +#else // !_WIN64 + +// We maintain 16-byte alignment at calls. There is an 8-byte return address +// on the stack and we push 56 bytes which maintains 16-byte stack alignment +// at the call. +// Source: https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf +asm( +#ifdef __APPLE__ + ".globl _PushAllRegistersAndIterateStack \n" + ".private_extern _PushAllRegistersAndIterateStack \n" + "_PushAllRegistersAndIterateStack: \n" +#else // !__APPLE__ + ".globl PushAllRegistersAndIterateStack \n" + ".type PushAllRegistersAndIterateStack, %function \n" + ".hidden PushAllRegistersAndIterateStack \n" + "PushAllRegistersAndIterateStack: \n" +#endif // !__APPLE__ + // rbp is callee-saved. Maintain proper frame pointer for debugging. + " push %rbp \n" + " mov %rsp, %rbp \n" + // Dummy for alignment. + " push $0xCDCDCD \n" + " push %rbx \n" + " push %r12 \n" + " push %r13 \n" + " push %r14 \n" + " push %r15 \n" + // Pass 1st parameter (rdi) unchanged (Stack*). + // Pass 2nd parameter (rsi) unchanged (StackVisitor*). + // Save 3rd parameter (rdx; IterateStackCallback) + " mov %rdx, %r8 \n" + // Pass 3rd parameter as rsp (stack pointer). + " mov %rsp, %rdx \n" + // Call the callback. + " call *%r8 \n" + // Pop the callee-saved registers. + " add $48, %rsp \n" + // Restore rbp as it was used as frame pointer. + " pop %rbp \n" + " ret \n"); + +#endif // !_WIN64 |