diff options
| author | Brian Gianforcaro <bgianf@serenityos.org> | 2021-12-24 03:28:06 -0800 |
|---|---|---|
| committer | Brian Gianforcaro <b.gianfo@gmail.com> | 2021-12-24 05:26:21 -0800 |
| commit | 49749e279aeab4a3da0e6e94333aaa8125ecb1a4 (patch) | |
| tree | 70016656030ca8b3a27abfbaa4ff5364b3f3fb1a /Userland/Libraries/LibC | |
| parent | eefe471dce7cd7563fa83f20dd774ef1d6a5168a (diff) | |
| download | serenity-49749e279aeab4a3da0e6e94333aaa8125ecb1a4.zip | |
LibC: Implement _setjmp and _longjmp
These are aliases to `setjmp()` and `longjmp()` on our system,
as our implementations don't modify the signal mask.
This is required for the syzkaller executor process.
Diffstat (limited to 'Userland/Libraries/LibC')
| -rw-r--r-- | Userland/Libraries/LibC/arch/i386/setjmp.S | 4 | ||||
| -rw-r--r-- | Userland/Libraries/LibC/setjmp.h | 12 |
2 files changed, 16 insertions, 0 deletions
diff --git a/Userland/Libraries/LibC/arch/i386/setjmp.S b/Userland/Libraries/LibC/arch/i386/setjmp.S index 27c934f80e..dff0361ca4 100644 --- a/Userland/Libraries/LibC/arch/i386/setjmp.S +++ b/Userland/Libraries/LibC/arch/i386/setjmp.S @@ -14,7 +14,9 @@ mov (%esp), %ebx ret +.global _setjmp .global setjmp +_setjmp: setjmp: xor %eax, %eax // Grab val argument (hardcoded to zero) jmp .Lsigset_common @@ -57,7 +59,9 @@ sigsetjmp: xor %eax, %eax ret +.global _longjmp .global longjmp +_longjmp: longjmp: mov 4(%esp), %ecx // Grab jmp_buf argument mov 8(%esp), %eax // Grab val argument diff --git a/Userland/Libraries/LibC/setjmp.h b/Userland/Libraries/LibC/setjmp.h index f55eba523b..2c998b4237 100644 --- a/Userland/Libraries/LibC/setjmp.h +++ b/Userland/Libraries/LibC/setjmp.h @@ -79,4 +79,16 @@ __attribute__((noreturn)) void longjmp(jmp_buf, int val); int sigsetjmp(sigjmp_buf, int savesigs); __attribute__((noreturn)) void siglongjmp(sigjmp_buf, int val); +/** + * _setjmp() and _longjmp() are specified as behaving the exactly the same as + * setjmp() and longjmp(), except they are not supposed to modify the signal mask. + * + * Our implementations already follow this restriction, so we just map them directly + * to the same functions. + * + * https://pubs.opengroup.org/onlinepubs/9699969599/functions/_setjmp.html + */ +int _setjmp(jmp_buf); +__attribute__((noreturn)) void _longjmp(jmp_buf, int val); + __END_DECLS |