mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-23 08:00:20 +00:00
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <bits/stdint.h>
|
|
#include <signal.h>
|
|
#include <stdbool.h>
|
|
#include <sys/cdefs.h>
|
|
#include <sys/types.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
//
|
|
// /!\ This structure is accessed inside setjmp.S, keep both files in sync!
|
|
//
|
|
|
|
struct __jmp_buf {
|
|
#ifdef __i386__
|
|
uint32_t ebx;
|
|
uint32_t esi;
|
|
uint32_t edi;
|
|
uint32_t ebp;
|
|
uint32_t esp;
|
|
uint32_t eip;
|
|
#elif defined(__x86_64__)
|
|
uint64_t rbx;
|
|
uint64_t r12;
|
|
uint64_t r13;
|
|
uint64_t r14;
|
|
uint64_t r15;
|
|
uint64_t rbp;
|
|
uint64_t rsp;
|
|
uint64_t rip;
|
|
#elif defined(__aarch64__)
|
|
// FIXME: This is likely incorrect.
|
|
uint64_t regs[22];
|
|
#else
|
|
# error
|
|
#endif
|
|
int did_save_signal_mask;
|
|
sigset_t saved_signal_mask;
|
|
};
|
|
|
|
typedef struct __jmp_buf jmp_buf[1];
|
|
typedef struct __jmp_buf sigjmp_buf[1];
|
|
|
|
/**
|
|
* Since setjmp.h may be included by ports written in C, we need to guard this.
|
|
*/
|
|
#ifdef __cplusplus
|
|
# ifdef __i386__
|
|
static_assert(sizeof(struct __jmp_buf) == 32, "struct __jmp_buf unsynchronized with i386/setjmp.S");
|
|
# elif defined(__x86_64__)
|
|
static_assert(sizeof(struct __jmp_buf) == 72, "struct __jmp_buf unsynchronized with x86_64/setjmp.S");
|
|
# elif defined(__aarch64__)
|
|
static_assert(sizeof(struct __jmp_buf) == 184, "struct __jmp_buf unsynchronized with aarch64/setjmp.S");
|
|
# else
|
|
# error
|
|
# endif
|
|
#endif
|
|
|
|
/**
|
|
* Calling conventions mandates that sigsetjmp() cannot call setjmp(),
|
|
* otherwise the restored calling environment will not be the original caller's
|
|
* but sigsetjmp()'s and we'll return to the wrong call site on siglongjmp().
|
|
*
|
|
* The setjmp(), sigsetjmp() and longjmp() functions have to be implemented in
|
|
* assembly because they touch the call stack and registers in non-portable
|
|
* ways. However, we *can* implement siglongjmp() as a standard C function.
|
|
*/
|
|
|
|
int setjmp(jmp_buf);
|
|
__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
|