| 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 | |