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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
//===-- Implementation of sigsetjmp ---------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "src/setjmp/sigsetjmp.h"
#include "hdr/offsetof_macros.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/setjmp/setjmp_impl.h"
#include "src/setjmp/sigsetjmp_epilogue.h"
#if !defined(LIBC_TARGET_ARCH_IS_X86)
#error "Invalid file include"
#endif
namespace LIBC_NAMESPACE_DECL {
#ifdef __i386__
[[gnu::naked]]
LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf buf)) {
asm(R"(
mov 8(%%esp), %%ecx
jecxz .Lnosave
mov 4(%%esp), %%eax
pop %c[retaddr](%%eax)
mov %%ebx, %c[extra](%%eax)
mov %%eax, %%ebx
call %P[setjmp]
push %c[retaddr](%%ebx)
mov %%ebx,4(%%esp)
mov %%eax,8(%%esp)
mov %c[extra](%%ebx), %%ebx
jmp %P[epilogue]
.Lnosave:
jmp %P[setjmp])" ::[retaddr] "i"(offsetof(__jmp_buf, sig_retaddr)),
[extra] "i"(offsetof(__jmp_buf, sig_extra)), [setjmp] "X"(setjmp),
[epilogue] "X"(sigsetjmp_epilogue)
: "eax", "ebx", "ecx");
}
#else
[[gnu::naked]]
LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf, int)) {
asm(R"(
test %%esi, %%esi
jz .Lnosave
pop %c[retaddr](%%rdi)
mov %%rbx, %c[extra](%%rdi)
mov %%rdi, %%rbx
call %P[setjmp]
push %c[retaddr](%%rbx)
mov %%rbx, %%rdi
mov %%eax, %%esi
mov %c[extra](%%rdi), %%rbx
jmp %P[epilogue]
.Lnosave:
jmp %P[setjmp])" ::[retaddr] "i"(offsetof(__jmp_buf, sig_retaddr)),
[extra] "i"(offsetof(__jmp_buf, sig_extra)), [setjmp] "X"(setjmp),
[epilogue] "X"(sigsetjmp_epilogue)
: "rax", "rbx");
}
#endif
} // namespace LIBC_NAMESPACE_DECL
|
