| //===-- hwasan_setjmp_riscv64.S -------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is a part of HWAddressSanitizer. |
| // setjmp interceptor for risc-v. |
| // HWAddressSanitizer runtime. |
| //===----------------------------------------------------------------------===// |
| |
| #include "sanitizer_common/sanitizer_asm.h" |
| #include "builtins/assembly.h" |
| |
| #if HWASAN_WITH_INTERCEPTORS && defined(__riscv) && (__riscv_xlen == 64) |
| #include "sanitizer_common/sanitizer_platform.h" |
| |
| // We want to save the context of the calling function. |
| // That requires |
| // 1) No modification of the link register by this function. |
| // 2) No modification of the stack pointer by this function. |
| // 3) (no modification of any other saved register, but that's not really going |
| // to occur, and hence isn't as much of a worry). |
| // |
| // There's essentially no way to ensure that the compiler will not modify the |
| // stack pointer when compiling a C function. |
| // Hence we have to write this function in assembly. |
| |
| .section .text |
| .file "hwasan_setjmp_riscv64.S" |
| |
| .global ASM_WRAPPER_NAME(setjmp) |
| ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(setjmp)) |
| ASM_WRAPPER_NAME(setjmp): |
| CFI_STARTPROC |
| addi x11, x0, 0 |
| tail ASM_WRAPPER_NAME(sigsetjmp) |
| CFI_ENDPROC |
| ASM_SIZE(ASM_WRAPPER_NAME(setjmp)) |
| |
| .global ASM_WRAPPER_NAME(sigsetjmp) |
| ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(sigsetjmp)) |
| ASM_WRAPPER_NAME(sigsetjmp): |
| CFI_STARTPROC |
| sd ra, 0<<3(x10) |
| sd s0, 1<<3(x10) |
| sd s1, 2<<3(x10) |
| sd s2, 3<<3(x10) |
| sd s3, 4<<3(x10) |
| sd s4, 5<<3(x10) |
| sd s5, 6<<3(x10) |
| sd s6, 7<<3(x10) |
| sd s7, 8<<3(x10) |
| sd s8, 9<<3(x10) |
| sd s9, 10<<3(x10) |
| sd s10, 11<<3(x10) |
| sd s11, 12<<3(x10) |
| sd sp, 13<<3(x10) |
| #if __riscv_float_abi_double |
| fsd fs0, 14<<3(x10) |
| fsd fs1, 15<<3(x10) |
| fsd fs2, 16<<3(x10) |
| fsd fs3, 17<<3(x10) |
| fsd fs4, 18<<3(x10) |
| fsd fs5, 19<<3(x10) |
| fsd fs6, 20<<3(x10) |
| fsd fs7, 21<<3(x10) |
| fsd fs8, 22<<3(x10) |
| fsd fs9, 23<<3(x10) |
| fsd fs10, 24<<3(x10) |
| fsd fs11, 25<<3(x10) |
| #elif __riscv_float_abi_soft |
| #else |
| # error "Unsupported case" |
| #endif |
| // We always have the second argument to __sigjmp_save (savemask) set, since |
| // the _setjmp function above has set it for us as `false`. |
| // This function is defined in hwasan_interceptors.cc |
| tail __sigjmp_save |
| CFI_ENDPROC |
| ASM_SIZE(ASM_WRAPPER_NAME(sigsetjmp)) |
| |
| ASM_INTERCEPTOR_TRAMPOLINE(sigsetjmp) |
| ASM_TRAMPOLINE_ALIAS(__sigsetjmp, sigsetjmp) |
| ASM_INTERCEPTOR_TRAMPOLINE(setjmp) |
| ASM_TRAMPOLINE_ALIAS(_setjmp, setjmp) |
| #endif |
| |
| // We do not need executable stack. |
| NO_EXEC_STACK_DIRECTIVE |
