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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-exception6//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 requires22// 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 going25// 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 the28// stack pointer when compiling a C function.29// Hence we have to write this function in assembly.30 31.section .text32.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_STARTPROC38 addi x11, x0, 039 tail ASM_WRAPPER_NAME(sigsetjmp)40 CFI_ENDPROC41ASM_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_STARTPROC47 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_double62 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_soft75#else76# error "Unsupported case"77#endif78 // We always have the second argument to __sigjmp_save (savemask) set, since79 // the _setjmp function above has set it for us as `false`.80 // This function is defined in hwasan_interceptors.cc81 tail __sigjmp_save82 CFI_ENDPROC83ASM_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#endif90 91// We do not need executable stack.92NO_EXEC_STACK_DIRECTIVE93