254 lines
6.3 KiB
C
254 lines
6.3 KiB
C
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#ifndef _SIGNAL_H
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#define _SIGNAL_H
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#include <stdc_common.h>
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typedef long sig_atomic_t; // there are no "asynchronous interrupts"
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#define SIG_DFL ((void *)0)
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#define SIG_IGN _sig_ign
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#define SIG_ERR ((void *)-1)
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typedef void (*_Sighandler)(int);
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struct sigaction {
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void (*sa_handler)(int);
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#define sa_sigaction sa_handler
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unsigned long sa_flags;
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void (*sa_restorer)(void);
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unsigned long sa_mask;
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};
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unsigned char _signal_restorer[] = {
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0x48,0xb8,15,0,0,0,0,0,0,0, // mov rax, 15 (sigreturn)
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0x0f,0x05 // syscall
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};
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#define _SIGNAL_HANDLERS 0xfff000
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#define _LE64(x) (x)&0xff, ((x)>> 8)&0xff, ((x)>>16)&0xff, ((x)>>24)&0xff, \
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((x)>>32)&0xff, ((x)>>40)&0xff, ((x)>>48)&0xff, (x)>>56
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// we need to do this weird indirection because linux has a different
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// calling convention from us.
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unsigned char _signal_handler[] = {
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// signal # passed in rdi
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0x48,0x89,0xf8, // mov rax, rdi (signal #)
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0x50, // push rax
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0x50, // push rax (allocate space for return value)
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0x48,0xb8,_LE64(_SIGNAL_HANDLERS), // mov rax, _SIGNAL_HANDLERS
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0x48,0x89,0xc3, // mov rbx, rax
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0x48,0x89,0xf8, // mov rax, rdi (signal #)
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0x48,0xc1,0xe0,0x03, // shl rax, 3
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0x48,0x01,0xd8, // add rax, rbx
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0x48,0x89,0xc3, // mov rbx, rax
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0x48,0x8b,0x03, // mov rax, [rbx]
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0xff,0xd0, // call rax
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0x48,0x81,0xc4,16,0,0,0, // add rsp, 16
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0xc3 // ret
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};
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#define _SA_RESTORER 0x04000000
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#define SA_SIGINFO 4
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#define SA_RESETHAND 0x80000000
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int __sigaction(int signum, const struct sigaction *act, struct sigaction *oldact) {
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return __syscall(13, signum, act, oldact, 8, 0, 0);
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}
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void sigemptyset(unsigned long *set) {
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*set = 0;
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}
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void _sig_ign(int signal) {
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return;
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}
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static unsigned long _sig_mask = 0;
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_Sighandler signal(int sig, _Sighandler func) {
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void **handlers = _SIGNAL_HANDLERS;
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_Sighandler ret = handlers[sig];
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if (func == SIG_IGN) {
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func = _sig_ign;
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}
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handlers[sig] = func;
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if (func == SIG_DFL) {
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_sig_mask &= ~(1ul << (sig-1));
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} else {
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_sig_mask |= 1ul << (sig-1);
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}
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struct sigaction act = {0};
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act.sa_handler = func == SIG_DFL ? SIG_DFL : (void*)_signal_handler;
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act.sa_mask = _sig_mask;
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act.sa_flags = _SA_RESTORER;
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act.sa_restorer = _signal_restorer;
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__sigaction(sig, &act, NULL);
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return ret;
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}
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int raise(int signal) {
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return kill(getpid(), signal);
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}
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#define FPE_INTDIV 1
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#define FPE_FLTDIV 3
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#define __SI_MAX_SIZE 128
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#if __WORDSIZE == 64
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# define __SI_PAD_SIZE ((__SI_MAX_SIZE / sizeof (int)) - 4)
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#else
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# define __SI_PAD_SIZE ((__SI_MAX_SIZE / sizeof (int)) - 3)
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#endif
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#ifndef __SI_ALIGNMENT
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# define __SI_ALIGNMENT /* nothing */
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#endif
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#ifndef __SI_BAND_TYPE
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# define __SI_BAND_TYPE long int
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#endif
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#ifndef __SI_CLOCK_T
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# define __SI_CLOCK_T __clock_t
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#endif
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#ifndef __SI_ERRNO_THEN_CODE
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# define __SI_ERRNO_THEN_CODE 1
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#endif
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#ifndef __SI_HAVE_SIGSYS
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# define __SI_HAVE_SIGSYS 1
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#endif
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#ifndef __SI_SIGFAULT_ADDL
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# define __SI_SIGFAULT_ADDL /* nothing */
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#endif
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typedef int __pid_t;
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typedef unsigned __uid_t;
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union __sigval
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{
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int __sival_int;
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void *__sival_ptr;
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};
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typedef union __sigval __sigval_t;
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typedef long __clock_t;
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typedef struct
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{
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int si_signo; /* Signal number. */
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#if __SI_ERRNO_THEN_CODE
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int si_errno; /* If non-zero, an errno value associated with
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this signal, as defined in <errno.h>. */
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int si_code; /* Signal code. */
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#else
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int si_code;
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int si_errno;
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#endif
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#if __WORDSIZE == 64
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int __pad0; /* Explicit padding. */
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#endif
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union
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{
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int _pad[__SI_PAD_SIZE];
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/* kill(). */
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struct
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{
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__pid_t si_pid; /* Sending process ID. */
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__uid_t si_uid; /* Real user ID of sending process. */
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} _kill;
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/* POSIX.1b timers. */
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struct
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{
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int si_tid; /* Timer ID. */
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int si_overrun; /* Overrun count. */
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__sigval_t si_sigval; /* Signal value. */
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} _timer;
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/* POSIX.1b signals. */
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struct
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{
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__pid_t si_pid; /* Sending process ID. */
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__uid_t si_uid; /* Real user ID of sending process. */
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__sigval_t si_sigval; /* Signal value. */
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} _rt;
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/* SIGCHLD. */
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struct
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{
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__pid_t si_pid; /* Which child. */
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__uid_t si_uid; /* Real user ID of sending process. */
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int si_status; /* Exit value or signal. */
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__SI_CLOCK_T si_utime;
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__SI_CLOCK_T si_stime;
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} _sigchld;
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/* SIGILL, SIGFPE, SIGSEGV, SIGBUS. */
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struct
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{
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void *si_addr; /* Faulting insn/memory ref. */
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__SI_SIGFAULT_ADDL
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short int si_addr_lsb; /* Valid LSB of the reported address. */
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union
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{
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/* used when si_code=SEGV_BNDERR */
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struct
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{
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void *_lower;
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void *_upper;
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} _addr_bnd;
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/* used when si_code=SEGV_PKUERR */
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uint32_t _pkey;
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} _bounds;
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} _sigfault;
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/* SIGPOLL. */
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struct
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{
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__SI_BAND_TYPE si_band; /* Band event for SIGPOLL. */
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int si_fd;
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} _sigpoll;
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/* SIGSYS. */
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#if __SI_HAVE_SIGSYS
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struct
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{
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void *_call_addr; /* Calling user insn. */
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int _syscall; /* Triggering system call number. */
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unsigned int _arch; /* AUDIT_ARCH_* of syscall. */
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} _sigsys;
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#endif
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} _sifields;
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} siginfo_t __SI_ALIGNMENT;
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/* X/Open requires some more fields with fixed names. */
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#define si_pid _sifields._kill.si_pid
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#define si_uid _sifields._kill.si_uid
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#define si_timerid _sifields._timer.si_tid
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#define si_overrun _sifields._timer.si_overrun
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#define si_status _sifields._sigchld.si_status
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#define si_utime _sifields._sigchld.si_utime
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#define si_stime _sifields._sigchld.si_stime
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#define si_value _sifields._rt.si_sigval
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#define si_int _sifields._rt.si_sigval.sival_int
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#define si_ptr _sifields._rt.si_sigval.sival_ptr
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#define si_addr _sifields._sigfault.si_addr
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#define si_addr_lsb _sifields._sigfault.si_addr_lsb
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#define si_lower _sifields._sigfault._bounds._addr_bnd._lower
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#define si_upper _sifields._sigfault._bounds._addr_bnd._upper
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#define si_pkey _sifields._sigfault._bounds._pkey
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#define si_band _sifields._sigpoll.si_band
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#define si_fd _sifields._sigpoll.si_fd
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#if __SI_HAVE_SIGSYS
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# define si_call_addr _sifields._sigsys._call_addr
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# define si_syscall _sifields._sigsys._syscall
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# define si_arch _sifields._sigsys._arch
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#endif
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#endif // _SIGNAL_H
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