libsanitizer/hwasan/hwasan_registers.h

   1 //===-- hwasan_registers.h --------------------------------------*- C++ -*-===//
   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 describes the register state retrieved by hwasan when error reporting.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef HWASAN_REGISTERS_H
  14 #define HWASAN_REGISTERS_H
  15
  16 #include "sanitizer_common/sanitizer_common.h"
  17 #include "sanitizer_common/sanitizer_platform.h"
  18
  19 #if defined(__aarch64__)
  20
  21 #  define CAN_GET_REGISTERS 1
  22
  23 struct Registers {
  24   uptr x[32];
  25 };
  26
  27 __attribute__((always_inline, unused)) static Registers GetRegisters() {
  28   Registers regs;
  29   __asm__ volatile(
  30       "stp x0, x1, [%1, #(8 * 0)]\n"
  31       "stp x2, x3, [%1, #(8 * 2)]\n"
  32       "stp x4, x5, [%1, #(8 * 4)]\n"
  33       "stp x6, x7, [%1, #(8 * 6)]\n"
  34       "stp x8, x9, [%1, #(8 * 8)]\n"
  35       "stp x10, x11, [%1, #(8 * 10)]\n"
  36       "stp x12, x13, [%1, #(8 * 12)]\n"
  37       "stp x14, x15, [%1, #(8 * 14)]\n"
  38       "stp x16, x17, [%1, #(8 * 16)]\n"
  39       "stp x18, x19, [%1, #(8 * 18)]\n"
  40       "stp x20, x21, [%1, #(8 * 20)]\n"
  41       "stp x22, x23, [%1, #(8 * 22)]\n"
  42       "stp x24, x25, [%1, #(8 * 24)]\n"
  43       "stp x26, x27, [%1, #(8 * 26)]\n"
  44       "stp x28, x29, [%1, #(8 * 28)]\n"
  45       : "=m"(regs)
  46       : "r"(regs.x));
  47   regs.x[30] = reinterpret_cast<uintptr_t>(__builtin_return_address(0));
  48   regs.x[31] = reinterpret_cast<uintptr_t>(__builtin_frame_address(0));
  49   return regs;
  50 }
  51
  52 #else
  53 #  define CAN_GET_REGISTERS 0
  54 #endif
  55
  56 #endif  // HWASAN_REGISTERS_H