1//===-- hwasan_setjmp_riscv64.S -------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file is a part of HWAddressSanitizer. 10// setjmp interceptor for risc-v. 11// HWAddressSanitizer runtime. 12//===----------------------------------------------------------------------===// 13 14#include "sanitizer_common/sanitizer_asm.h" 15#include "builtins/assembly.h" 16 17#if HWASAN_WITH_INTERCEPTORS && defined(__riscv) && (__riscv_xlen == 64) 18#include "sanitizer_common/sanitizer_platform.h" 19 20// We want to save the context of the calling function. 21// That requires 22// 1) No modification of the link register by this function. 23// 2) No modification of the stack pointer by this function. 24// 3) (no modification of any other saved register, but that's not really going 25// to occur, and hence isn't as much of a worry). 26// 27// There's essentially no way to ensure that the compiler will not modify the 28// stack pointer when compiling a C function. 29// Hence we have to write this function in assembly. 30 31.section .text 32.file "hwasan_setjmp_riscv64.S" 33 34.global ASM_WRAPPER_NAME(setjmp) 35ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(setjmp)) 36ASM_WRAPPER_NAME(setjmp): 37 CFI_STARTPROC 38 addi x11, x0, 0 39 tail ASM_WRAPPER_NAME(sigsetjmp) 40 CFI_ENDPROC 41ASM_SIZE(ASM_WRAPPER_NAME(setjmp)) 42 43.global ASM_WRAPPER_NAME(sigsetjmp) 44ASM_TYPE_FUNCTION(ASM_WRAPPER_NAME(sigsetjmp)) 45ASM_WRAPPER_NAME(sigsetjmp): 46 CFI_STARTPROC 47 sd ra, 0<<3(x10) 48 sd s0, 1<<3(x10) 49 sd s1, 2<<3(x10) 50 sd s2, 3<<3(x10) 51 sd s3, 4<<3(x10) 52 sd s4, 5<<3(x10) 53 sd s5, 6<<3(x10) 54 sd s6, 7<<3(x10) 55 sd s7, 8<<3(x10) 56 sd s8, 9<<3(x10) 57 sd s9, 10<<3(x10) 58 sd s10, 11<<3(x10) 59 sd s11, 12<<3(x10) 60 sd sp, 13<<3(x10) 61#if __riscv_float_abi_double 62 fsd fs0, 14<<3(x10) 63 fsd fs1, 15<<3(x10) 64 fsd fs2, 16<<3(x10) 65 fsd fs3, 17<<3(x10) 66 fsd fs4, 18<<3(x10) 67 fsd fs5, 19<<3(x10) 68 fsd fs6, 20<<3(x10) 69 fsd fs7, 21<<3(x10) 70 fsd fs8, 22<<3(x10) 71 fsd fs9, 23<<3(x10) 72 fsd fs10, 24<<3(x10) 73 fsd fs11, 25<<3(x10) 74#elif __riscv_float_abi_soft 75#else 76# error "Unsupported case" 77#endif 78 // We always have the second argument to __sigjmp_save (savemask) set, since 79 // the _setjmp function above has set it for us as `false`. 80 // This function is defined in hwasan_interceptors.cc 81 tail __sigjmp_save 82 CFI_ENDPROC 83ASM_SIZE(ASM_WRAPPER_NAME(sigsetjmp)) 84 85ASM_INTERCEPTOR_TRAMPOLINE(sigsetjmp) 86ASM_TRAMPOLINE_ALIAS(__sigsetjmp, sigsetjmp) 87ASM_INTERCEPTOR_TRAMPOLINE(setjmp) 88ASM_TRAMPOLINE_ALIAS(_setjmp, setjmp) 89#endif 90 91// We do not need executable stack. 92NO_EXEC_STACK_DIRECTIVE 93