Sweden-Number/loader/signal.c

153 lines
3.5 KiB
C

#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <syscall.h>
#include <signal.h>
#include <errno.h>
#ifdef linux
#include <linux/sched.h>
#include <asm/system.h>
#endif
#include <wine.h>
char * cstack[4096];
struct sigaction segv_act;
#ifdef linux
extern void ___sig_restore();
extern void ___masksig_restore();
#endif
/* Similar to the sigaction function in libc, except it leaves alone the
restorer field */
static int
wine_sigaction(int sig,struct sigaction * new, struct sigaction * old)
{
__asm__("int $0x80":"=a" (sig)
:"0" (SYS_sigaction),"b" (sig),"c" (new),"d" (old));
if (sig>=0)
return 0;
errno = -sig;
return -1;
}
#ifdef linux
static void win_fault(int signal, struct sigcontext_struct context){
struct sigcontext_struct *scp = &context;
#else
static void win_fault(int signal, int code, struct sigcontext *scp){
#endif
unsigned char * instr;
unsigned char intno;
unsigned int * dump;
int i;
/* First take care of a few preliminaries */
#ifdef linux
if(signal != SIGSEGV) exit(1);
if((scp->sc_cs & 7) != 7){
#endif
#ifdef __NetBSD__
/* set_es(0x27); set_ds(0x27); */
if(signal != SIGBUS) exit(1);
if(scp->sc_cs == 0x1f){
#endif
fprintf(stderr,
"Segmentation fault in Wine program (%x:%x)."
" Please debug\n",
scp->sc_cs, scp->sc_eip);
goto oops;
};
/* Now take a look at the actual instruction where the program
bombed */
instr = (char *) ((scp->sc_cs << 16) | (scp->sc_eip & 0xffff));
if(*instr != 0xcd) {
fprintf(stderr,
"Unexpected Windows program segfault"
" - opcode = %x\n", *instr);
#if 0
return;
#else
goto oops;
#endif
};
instr++;
intno = *instr;
switch(intno){
case 0x21:
if(!do_int21(scp)) goto oops;
break;
case 0x11:
scp->sc_eax = 0x00000000; /* get equipment list: we haven't */
break; /* got anything */
case 0x12:
scp->sc_eax = 640L; /* get base mem size */
break;
case 0x1A:
if(!do_int1A(scp)) goto oops;
break;
default:
fprintf(stderr,"Unexpected Windows interrupt %x\n", intno);
goto oops;
};
/* OK, done handling the interrupt */
scp->sc_eip += 2; /* Bypass the int instruction */
return;
oops:
fprintf(stderr,"In win_fault %x:%x\n", scp->sc_cs, scp->sc_eip);
#ifdef linux
wine_debug(scp); /* Enter our debugger */
#else
fprintf(stderr,"Stack: %x:%x\n", scp->sc_ss, scp->sc_esp);
dump = (int*) scp;
for(i=0; i<22; i++)
{
fprintf(stderr," %8.8x", *dump++);
if ((i % 8) == 7)
fprintf(stderr,"\n");
}
fprintf(stderr,"\n");
exit(1);
#endif
}
int
init_wine_signals(){
#ifdef linux
segv_act.sa_handler = (__sighandler_t) win_fault;
/* Point to the top of the stack, minus 4 just in case, and make
it aligned */
segv_act.sa_restorer =
(void (*)()) (((unsigned int)(cstack) + sizeof(cstack) - 4) & ~3);
wine_sigaction(SIGSEGV, &segv_act, NULL);
#endif
#ifdef __NetBSD__
struct sigstack ss;
sigset_t sig_mask;
ss.ss_sp = (char *) (((unsigned int)(cstack) + sizeof(cstack) - 4) & ~3);
ss.ss_onstack = 0;
if (sigstack(&ss, NULL) < 0) {
perror("sigstack");
exit(1);
}
sigemptyset(&sig_mask);
segv_act.sa_handler = (__sighandler_t) win_fault;
segv_act.sa_flags = SA_ONSTACK;
segv_act.sa_mask = sig_mask;
if (sigaction(SIGBUS, &segv_act, NULL) < 0) {
perror("sigaction");
exit(1);
}
#endif
}