1 | //===-- Implementation of longjmp -----------------------------------------===// |
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/longjmp.h" |
10 | #include "include/llvm-libc-macros/offsetof-macro.h" |
11 | #include "src/__support/common.h" |
12 | #include "src/__support/macros/config.h" |
13 | |
14 | #if !defined(LIBC_TARGET_ARCH_IS_X86) |
15 | #error "Invalid file include" |
16 | #endif |
17 | |
18 | namespace LIBC_NAMESPACE_DECL { |
19 | |
20 | #ifdef __i386__ |
21 | [[gnu::naked]] |
22 | LLVM_LIBC_FUNCTION(void, longjmp, (jmp_buf, int)) { |
23 | asm(R"( |
24 | mov 0x4(%%esp), %%ecx |
25 | mov 0x8(%%esp), %%eax |
26 | cmpl $0x1, %%eax |
27 | adcl $0x0, %%eax |
28 | |
29 | mov %c[ebx](%%ecx), %%ebx |
30 | mov %c[esi](%%ecx), %%esi |
31 | mov %c[edi](%%ecx), %%edi |
32 | mov %c[ebp](%%ecx), %%ebp |
33 | mov %c[esp](%%ecx), %%esp |
34 | |
35 | jmp *%c[eip](%%ecx) |
36 | )" ::[ebx] "i" (offsetof(__jmp_buf, ebx)), |
37 | [esi] "i" (offsetof(__jmp_buf, esi)), [edi] "i" (offsetof(__jmp_buf, edi)), |
38 | [ebp] "i" (offsetof(__jmp_buf, ebp)), [esp] "i" (offsetof(__jmp_buf, esp)), |
39 | [eip] "i" (offsetof(__jmp_buf, eip))); |
40 | } |
41 | #else |
42 | [[gnu::naked]] |
43 | LLVM_LIBC_FUNCTION(void, longjmp, (jmp_buf, int)) { |
44 | asm(R"( |
45 | cmpl $0x1, %%esi |
46 | adcl $0x0, %%esi |
47 | movq %%rsi, %%rax |
48 | |
49 | movq %c[rbx](%%rdi), %%rbx |
50 | movq %c[rbp](%%rdi), %%rbp |
51 | movq %c[r12](%%rdi), %%r12 |
52 | movq %c[r13](%%rdi), %%r13 |
53 | movq %c[r14](%%rdi), %%r14 |
54 | movq %c[r15](%%rdi), %%r15 |
55 | movq %c[rsp](%%rdi), %%rsp |
56 | jmpq *%c[rip](%%rdi) |
57 | )" ::[rbx] "i" (offsetof(__jmp_buf, rbx)), |
58 | [rbp] "i" (offsetof(__jmp_buf, rbp)), [r12] "i" (offsetof(__jmp_buf, r12)), |
59 | [r13] "i" (offsetof(__jmp_buf, r13)), [r14] "i" (offsetof(__jmp_buf, r14)), |
60 | [r15] "i" (offsetof(__jmp_buf, r15)), [rsp] "i" (offsetof(__jmp_buf, rsp)), |
61 | [rip] "i" (offsetof(__jmp_buf, rip))); |
62 | } |
63 | #endif |
64 | |
65 | } // namespace LIBC_NAMESPACE_DECL |
66 | |