derek.holloway
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103 lines
2.9 KiB
ArmAsm
103 lines
2.9 KiB
ArmAsm
//===-- hwasan_setjmp_aarch64.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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// This file is a part of HWAddressSanitizer.
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//
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// HWAddressSanitizer runtime.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_asm.h"
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#include "builtins/assembly.h"
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#if HWASAN_WITH_INTERCEPTORS && defined(__aarch64__)
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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 link register 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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TEXT_SECTION
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.file "hwasan_setjmp_aarch64.S"
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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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BTI_C
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mov x1, #0
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b ASM_WRAPPER_NAME(sigsetjmp)
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CFI_ENDPROC
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ASM_SIZE(ASM_WRAPPER_NAME(setjmp))
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ASM_INTERCEPTOR_TRAMPOLINE(setjmp)
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#if SANITIZER_ANDROID
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// Bionic also defines a function `setjmp` that calls `sigsetjmp` saving the
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// current signal.
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.global ASM_WRAPPER_NAME(setjmp_bionic)
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ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(setjmp_bionic))
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ASM_WRAPPER_NAME(setjmp_bionic):
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CFI_STARTPROC
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BTI_C
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mov x1, #1
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b ASM_WRAPPER_NAME(sigsetjmp)
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CFI_ENDPROC
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ASM_SIZE(ASM_WRAPPER_NAME(setjmp_bionic))
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ASM_INTERCEPTOR_TRAMPOLINE(setjmp_bionic)
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#endif
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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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CFI_STARTPROC
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BTI_C
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stp x19, x20, [x0, #0<<3]
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stp x21, x22, [x0, #2<<3]
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stp x23, x24, [x0, #4<<3]
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stp x25, x26, [x0, #6<<3]
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stp x27, x28, [x0, #8<<3]
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stp x29, x30, [x0, #10<<3]
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stp d8, d9, [x0, #14<<3]
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stp d10, d11, [x0, #16<<3]
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stp d12, d13, [x0, #18<<3]
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stp d14, d15, [x0, #20<<3]
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mov x2, sp
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str x2, [x0, #13<<3]
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// We always have the second argument to __sigjmp_save (savemask) set, since
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// the _setjmp function above has set it for us as `false`.
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// This function is defined in hwasan_interceptors.cc
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b __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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#if SANITIZER_ANDROID
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ASM_TRAMPOLINE_ALIAS(sigsetjmp, sigsetjmp)
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ASM_TRAMPOLINE_ALIAS(setjmp, setjmp_bionic)
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#else
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ASM_TRAMPOLINE_ALIAS(__sigsetjmp, sigsetjmp)
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#endif
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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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GNU_PROPERTY_BTI_PAC_GCS
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