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
57