1 | //===-- Implementation of sigsetjmp ---------------------------------------===// |
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 | #include "src/setjmp/sigsetjmp.h" |
10 | #include "hdr/offsetof_macros.h" |
11 | #include "src/__support/common.h" |
12 | #include "src/__support/macros/config.h" |
13 | #include "src/setjmp/setjmp_impl.h" |
14 | #include "src/setjmp/sigsetjmp_epilogue.h" |
15 | |
16 | #if !defined(LIBC_TARGET_ARCH_IS_X86) |
17 | #error "Invalid file include" |
18 | #endif |
19 | namespace LIBC_NAMESPACE_DECL { |
20 | #ifdef __i386__ |
21 | [[gnu::naked]] |
22 | LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf buf)) { |
23 | asm(R"( |
24 | mov 8(%%esp), %%ecx |
25 | jecxz .Lnosave |
26 | |
27 | mov 4(%%esp), %%eax |
28 | pop %c[retaddr](%%eax) |
29 | mov %%ebx, %c[extra](%%eax) |
30 | mov %%eax, %%ebx |
31 | call %P[setjmp] |
32 | push %c[retaddr](%%ebx) |
33 | mov %%ebx,4(%%esp) |
34 | mov %%eax,8(%%esp) |
35 | mov %c[extra](%%ebx), %%ebx |
36 | jmp %P[epilogue] |
37 | |
38 | .Lnosave: |
39 | jmp %P[setjmp])" ::[retaddr] "i" (offsetof(__jmp_buf, sig_retaddr)), |
40 | [extra] "i" (offsetof(__jmp_buf, sig_extra)), [setjmp] "X" (setjmp), |
41 | [epilogue] "X" (sigsetjmp_epilogue) |
42 | : "eax" , "ebx" , "ecx" ); |
43 | } |
44 | #endif |
45 | [[gnu::naked]] |
46 | LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf, int)) { |
47 | asm(R"( |
48 | test %%esi, %%esi |
49 | jz .Lnosave |
50 | |
51 | pop %c[retaddr](%%rdi) |
52 | mov %%rbx, %c[extra](%%rdi) |
53 | mov %%rdi, %%rbx |
54 | call %P[setjmp] |
55 | push %c[retaddr](%%rbx) |
56 | mov %%rbx, %%rdi |
57 | mov %%eax, %%esi |
58 | mov %c[extra](%%rdi), %%rbx |
59 | jmp %P[epilogue] |
60 | |
61 | .Lnosave: |
62 | jmp %P[setjmp])" ::[retaddr] "i" (offsetof(__jmp_buf, sig_retaddr)), |
63 | [extra] "i" (offsetof(__jmp_buf, sig_extra)), [setjmp] "X" (setjmp), |
64 | [epilogue] "X" (sigsetjmp_epilogue) |
65 | : "rax" , "rbx" ); |
66 | } |
67 | |
68 | } // namespace LIBC_NAMESPACE_DECL |
69 | |