blob: 64107e6d490b70bd13fca616f20e84da69102030 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// REQUIRES: linux && target={{aarch64-.+}}
// Basic test for float registers number are accepted.
#include <dlfcn.h>
#include <stdlib.h>
#include <string.h>
#include <unwind.h>
_Unwind_Reason_Code frame_handler(struct _Unwind_Context *ctx, void *arg) {
(void)arg;
Dl_info info = {0, 0, 0, 0};
// Unwind util the main is reached, above frames depend on the platform and
// architecture.
if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(ctx)), &info) &&
info.dli_sname && !strcmp("main", info.dli_sname))
_Exit(0);
return _URC_NO_REASON;
}
__attribute__((noinline)) void foo() {
// Provide some CFI directives that instructs the unwinder where given
// float register is.
#if defined(__aarch64__)
// DWARF register number for V0-V31 registers are 64-95.
// Previous value of V0 is saved at offset 0 from CFA.
asm volatile(".cfi_offset 64, 0");
// From now on the previous value of register can't be restored anymore.
asm volatile(".cfi_undefined 65");
asm volatile(".cfi_undefined 95");
// Previous value of V2 is in V30.
asm volatile(".cfi_register 66, 94");
#endif
_Unwind_Backtrace(frame_handler, NULL);
}
int main() {
foo();
return -2;
}
|
