derek.holloway
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81 lines
2.2 KiB
ArmAsm
81 lines
2.2 KiB
ArmAsm
//===-- hwasan_setjmp_x86_64.S --------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// setjmp interceptor for x86_64.
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//
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_asm.h"
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#if HWASAN_WITH_INTERCEPTORS && defined(__x86_64__)
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#include "sanitizer_common/sanitizer_platform.h"
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// We want to save the context of the calling function.
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// That requires
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// 1) No modification of the return address by this function.
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// 2) No modification of the stack pointer by this function.
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// 3) (no modification of any other saved register, but that's not really going
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// to occur, and hence isn't as much of a worry).
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//
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// There's essentially no way to ensure that the compiler will not modify the
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// stack pointer when compiling a C function.
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// Hence we have to write this function in assembly.
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//
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// TODO: Handle Intel CET.
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.section .text
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.file "hwasan_setjmp_x86_64.S"
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.att_syntax
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.global ASM_WRAPPER_NAME(setjmp)
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ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(setjmp))
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ASM_WRAPPER_NAME(setjmp):
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CFI_STARTPROC
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_CET_ENDBR
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xorl %esi, %esi
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jmp .Linterceptor_sigsetjmp
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CFI_ENDPROC
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ASM_SIZE(ASM_WRAPPER_NAME(setjmp))
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.global ASM_WRAPPER_NAME(sigsetjmp)
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ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(sigsetjmp))
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ASM_WRAPPER_NAME(sigsetjmp):
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.Linterceptor_sigsetjmp:
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CFI_STARTPROC
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_CET_ENDBR
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// Save callee save registers.
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mov %rbx, (0*8)(%rdi)
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mov %rbp, (1*8)(%rdi)
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mov %r12, (2*8)(%rdi)
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mov %r13, (3*8)(%rdi)
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mov %r14, (4*8)(%rdi)
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mov %r15, (5*8)(%rdi)
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// Save SP as it was in caller's frame.
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lea 8(%rsp), %rdx
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mov %rdx, (6*8)(%rdi)
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// Save return address.
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mov (%rsp), %rax
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mov %rax, (7*8)(%rdi)
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jmp __sigjmp_save
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CFI_ENDPROC
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ASM_SIZE(ASM_WRAPPER_NAME(sigsetjmp))
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ASM_INTERCEPTOR_TRAMPOLINE(sigsetjmp)
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ASM_TRAMPOLINE_ALIAS(__sigsetjmp, sigsetjmp)
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ASM_INTERCEPTOR_TRAMPOLINE(setjmp)
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ASM_TRAMPOLINE_ALIAS(_setjmp, setjmp)
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#endif
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// We do not need executable stack.
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NO_EXEC_STACK_DIRECTIVE
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