| 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 | |
|---|
