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[libc] implement aarch64 sigsetjmp (#136706)

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- **[libc][aarch64] implement sigsetjmp**

On top of https://github.com/llvm/llvm-project/pull/136072
See also https://github.com/llvm/llvm-project/issues/137055 for remarks
on naked attributes.

```c++
//===-- Implementation of setjmp ------------------------------------------===//
//
// 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"

namespace LIBC_NAMESPACE_DECL {
[[gnu::naked]]
LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf, int)) {
  asm(R"(
      cbz w1, %c[setjmp]
      str x30, [x0, %c[retaddr]]
      str x19, [x0, %c[extra]]
      mov x19, x0
      bl %c[setjmp]
      mov w1, w0
      mov x0, x19
      ldr x30, [x0, %c[retaddr]]
      ldr x19, [x0, %c[extra]]
      b %c[epilogue])" ::[retaddr] "i"(offsetof(__jmp_buf, sig_retaddr)),
      [extra] "i"(offsetof(__jmp_buf, sig_extra)), [setjmp] "i"(setjmp),
      [epilogue] "i"(sigsetjmp_epilogue)
      : "x0", "x1", "x19", "x30");
}
} // namespace LIBC_NAMESPACE_DECL
```
This commit is contained in:
Schrodinger ZHU Yifan 2025-04-29 16:37:25 -04:00 committed by GitHub
parent 1a6b0413e0
commit 9ebaa9d483
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
4 changed files with 53 additions and 1 deletions
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2
libc/config/linux/aarch64/entrypoints.txt
View File

@ -933,6 +933,8 @@ if(LLVM_LIBC_FULL_BUILD)
# setjmp.h entrypoints
libc.src.setjmp.longjmp
libc.src.setjmp.setjmp
libc.src.setjmp.siglongjmp
libc.src.setjmp.sigsetjmp
# stdio.h entrypoints
libc.src.stdio.clearerr

2
libc/include/llvm-libc-types/jmp_buf.h
View File

@ -12,7 +12,7 @@
// TODO: implement sigjmp_buf related functions for other architectures
// Issue: https://github.com/llvm/llvm-project/issues/136358
#if defined(__linux__)
#if defined(__i386__) || defined(__x86_64__)
#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
#define __LIBC_HAS_SIGJMP_BUF
#endif
#endif

14
libc/src/setjmp/aarch64/CMakeLists.txt
View File

@ -26,3 +26,17 @@ add_entrypoint_object(
libc.hdr.types.jmp_buf
${setjmp_config_options}
)
add_entrypoint_object(
sigsetjmp
SRCS
sigsetjmp.cpp
HDRS
../sigsetjmp.h
DEPENDS
libc.hdr.types.jmp_buf
libc.hdr.types.sigset_t
libc.hdr.offsetof_macros
libc.src.setjmp.sigsetjmp_epilogue
libc.src.setjmp.setjmp
)

36
libc/src/setjmp/aarch64/sigsetjmp.cpp Normal file
View File

@ -0,0 +1,36 @@
//===-- 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"
namespace LIBC_NAMESPACE_DECL {
[[gnu::naked]]
LLVM_LIBC_FUNCTION(int, sigsetjmp, (sigjmp_buf, int)) {
asm(R"(
cbz w1, %c[setjmp]
str x30, [x0, %c[retaddr]]
str x19, [x0, %c[extra]]
mov x19, x0
bl %c[setjmp]
mov w1, w0
mov x0, x19
ldr x30, [x0, %c[retaddr]]
ldr x19, [x0, %c[extra]]
b %c[epilogue])" ::[retaddr] "i"(offsetof(__jmp_buf, sig_retaddr)),
[extra] "i"(offsetof(__jmp_buf, sig_extra)), [setjmp] "i"(setjmp),
[epilogue] "i"(sigsetjmp_epilogue)
: "x0", "x1", "x19", "x30");
}
} // namespace LIBC_NAMESPACE_DECL