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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/compiler-rt/lib/hwasan/hwasan_setjmp_riscv64.S
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//===-- hwasan_setjmp_riscv64.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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// setjmp interceptor for risc-v.

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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(__riscv) && (__riscv_xlen == 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 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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.section .text

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.file "hwasan_setjmp_riscv64.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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  addi x11, x0, 0

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  tail ASM_WRAPPER_NAME(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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  CFI_STARTPROC

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  sd    ra,   0<<3(x10)

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  sd    s0,   1<<3(x10)

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  sd    s1,   2<<3(x10)

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  sd    s2,   3<<3(x10)

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  sd    s3,   4<<3(x10)

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  sd    s4,   5<<3(x10)

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  sd    s5,   6<<3(x10)

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  sd    s6,   7<<3(x10)

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  sd    s7,   8<<3(x10)

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  sd    s8,   9<<3(x10)

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  sd    s9,   10<<3(x10)

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  sd    s10,  11<<3(x10)

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  sd    s11,  12<<3(x10)

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  sd    sp,   13<<3(x10)

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#if __riscv_float_abi_double

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  fsd   fs0,  14<<3(x10)

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  fsd   fs1,  15<<3(x10)

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  fsd   fs2,  16<<3(x10)

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  fsd   fs3,  17<<3(x10)

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  fsd   fs4,  18<<3(x10)

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  fsd   fs5,  19<<3(x10)

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  fsd   fs6,  20<<3(x10)

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  fsd   fs7,  21<<3(x10)

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  fsd   fs8,  22<<3(x10)

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  fsd   fs9,  23<<3(x10)

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  fsd   fs10, 24<<3(x10)

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  fsd   fs11, 25<<3(x10)

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#elif __riscv_float_abi_soft

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#else

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# error "Unsupported case"

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#endif

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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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  tail __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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