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93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <bits/stdint.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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//
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// /!\ This structure is accessed inside setjmp.S, keep both files in sync!
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//
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struct __jmp_buf {
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#if defined(__x86_64__)
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uint64_t rbx;
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uint64_t r12;
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uint64_t r13;
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uint64_t r14;
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uint64_t r15;
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uint64_t rbp;
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uint64_t rsp;
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uint64_t rip;
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#elif defined(__aarch64__)
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// FIXME: This is likely incorrect.
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uint64_t regs[22];
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#elif defined(__riscv) && __riscv_xlen == 64
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uint64_t s[12];
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uint64_t fs[12];
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uint64_t sp;
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uint64_t ra;
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#else
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# error "Unknown architecture"
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#endif
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int did_save_signal_mask;
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sigset_t saved_signal_mask;
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};
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typedef struct __jmp_buf jmp_buf[1];
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typedef struct __jmp_buf sigjmp_buf[1];
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/**
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* Since setjmp.h may be included by ports written in C, we need to guard this.
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*/
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#ifdef __cplusplus
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# if defined(__x86_64__)
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static_assert(sizeof(struct __jmp_buf) == 72, "struct __jmp_buf unsynchronized with x86_64/setjmp.S");
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# elif defined(__aarch64__)
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static_assert(sizeof(struct __jmp_buf) == 184, "struct __jmp_buf unsynchronized with aarch64/setjmp.S");
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# elif defined(__riscv) && __riscv_xlen == 64
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static_assert(sizeof(struct __jmp_buf) == 216, "struct __jmp_buf unsynchronized with riscv64/setjmp.S");
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# else
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# error "Unknown architecture"
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# endif
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#endif
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/**
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* Calling conventions mandates that sigsetjmp() cannot call setjmp(),
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* otherwise the restored calling environment will not be the original caller's
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* but sigsetjmp()'s and we'll return to the wrong call site on siglongjmp().
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*
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* The setjmp(), sigsetjmp() and longjmp() functions have to be implemented in
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* assembly because they touch the call stack and registers in non-portable
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* ways. However, we *can* implement siglongjmp() as a standard C function.
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*/
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int setjmp(jmp_buf);
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__attribute__((noreturn)) void longjmp(jmp_buf, int val);
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int sigsetjmp(sigjmp_buf, int savesigs);
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__attribute__((noreturn)) void siglongjmp(sigjmp_buf, int val);
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/**
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* _setjmp() and _longjmp() are specified as behaving the exactly the same as
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* setjmp() and longjmp(), except they are not supposed to modify the signal mask.
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*
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* Our implementations already follow this restriction, so we just map them directly
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* to the same functions.
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*
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* https://pubs.opengroup.org/onlinepubs/9699969599/functions/_setjmp.html
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*/
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int _setjmp(jmp_buf);
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__attribute__((noreturn)) void _longjmp(jmp_buf, int val);
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__END_DECLS
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