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Sweden-Number/loader/signal.c

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/*
* Wine signal handling
*
* Copyright 1995 Alexandre Julliard
*/
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <setjmp.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYSCALL_H
# include <syscall.h>
#else
# ifdef HAVE_SYS_SYSCALL_H
# include <sys/syscall.h>
# endif
#endif
#include "winsock.h"
#include "global.h"
#include "options.h"
#include "debugger.h"
#include "miscemu.h"
#include "dosexe.h"
#include "thread.h"
#include "debug.h"
void (*fnWINE_Debugger)(int,SIGCONTEXT*) = NULL;
void (*ctx_debug_call)(int sig,CONTEXT*ctx)=NULL;
BOOL (*fnINSTR_EmulateInstruction)(SIGCONTEXT*ctx)=NULL;
#ifdef __i386__
/* i386 specific faults */
static const char * const SIGNAL_traps[] =
{
"Division by zero exception", /* 0 */
"Debug exception", /* 1 */
"NMI interrupt", /* 2 */
"Breakpoint exception", /* 3 */
"Overflow exception", /* 4 */
"Bound range exception", /* 5 */
"Invalid opcode exception", /* 6 */
"Device not available exception", /* 7 */
"Double fault exception", /* 8 */
"Coprocessor segment overrun", /* 9 */
"Invalid TSS exception", /* 10 */
"Segment not present exception", /* 11 */
"Stack fault", /* 12 */
"General protection fault", /* 13 */
"Page fault", /* 14 */
"Unknown exception", /* 15 */
"Floating point exception", /* 16 */
"Alignment check exception", /* 17 */
"Machine check exception" /* 18 */
};
#define NB_TRAPS (sizeof(SIGNAL_traps) / sizeof(SIGNAL_traps[0]))
#endif
/* Linux sigaction function */
#if defined(linux) && defined(__i386__)
/* This is the sigaction structure from the Linux 2.1.20 kernel. */
#undef sa_handler
struct kernel_sigaction
{
void (*sa_handler)();
unsigned long sa_mask;
unsigned long sa_flags;
void (*sa_restorer)();
};
/* Similar to the sigaction function in libc, except it leaves alone the
restorer field, which is used to specify the signal stack address */
static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
struct kernel_sigaction *old )
{
#ifdef __PIC__
__asm__ __volatile__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (sig)
: "0" (SYS_sigaction),
"r" (sig),
"c" (new),
"d" (old) );
#else
__asm__ __volatile__( "int $0x80"
: "=a" (sig)
: "0" (SYS_sigaction),
"b" (sig),
"c" (new),
"d" (old) );
#endif /* __PIC__ */
if (sig>=0)
return 0;
errno = -sig;
return -1;
}
#endif /* linux && __i386__ */
/* Signal stack */
static char SIGNAL_Stack[16384];
static sigset_t async_signal_set;
/**********************************************************************
* SIGNAL_child
*
* wait4 terminated child processes
*/
static HANDLER_DEF(SIGNAL_child)
{
HANDLER_INIT();
#ifdef HAVE_WAIT4
wait4( 0, NULL, WNOHANG, NULL);
#elif defined (HAVE_WAITPID)
/* I am sort-of guessing that this is the same as the wait4 call. */
waitpid (0, NULL, WNOHANG);
#else
wait(NULL);
#endif
}
/**********************************************************************
* SIGNAL_SetHandler
*/
void SIGNAL_SetHandler( int sig, void (*func)(), int flags )
{
int ret;
#if defined(linux) && defined(__i386__)
struct kernel_sigaction sig_act;
sig_act.sa_handler = func;
sig_act.sa_flags = SA_RESTART | (flags) ? SA_NOMASK : 0;
sig_act.sa_mask = 0;
/* Point to the top of the stack, minus 4 just in case, and make
it aligned */
sig_act.sa_restorer =
(void (*)())((int)(SIGNAL_Stack + sizeof(SIGNAL_Stack) - 4) & ~3);
ret = wine_sigaction( sig, &sig_act, NULL );
#else /* linux && __i386__ */
struct sigaction sig_act;
sig_act.sa_handler = func;
sigemptyset( &sig_act.sa_mask );
# if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
sig_act.sa_flags = SA_ONSTACK;
# elif defined (__svr4__) || defined(_SCO_DS)
sig_act.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
# elif defined(__EMX__)
sig_act.sa_flags = 0; /* FIXME: EMX has only SA_ACK and SA_SYSV */
# else
sig_act.sa_flags = 0;
# endif
ret = sigaction( sig, &sig_act, NULL );
#endif /* linux && __i386__ */
if (ret < 0)
{
perror( "sigaction" );
exit(1);
}
}
extern void stop_wait(int a);
extern void WINSOCK_sigio(int a);
extern void ASYNC_sigio(int a);
/**********************************************************************
* SIGNAL_MaskAsyncEvents
*/
void SIGNAL_MaskAsyncEvents( BOOL flag )
{
sigprocmask( (flag) ? SIG_BLOCK : SIG_UNBLOCK , &async_signal_set, NULL);
}
extern void SIGNAL_SetHandler( int sig, void (*func)(), int flags );
/**********************************************************************
* SIGNAL_break
*
* Handle Ctrl-C and such
*/
static HANDLER_DEF(SIGNAL_break)
{
HANDLER_INIT();
if (Options.debug && fnWINE_Debugger)
fnWINE_Debugger( signal, HANDLER_CONTEXT ); /* Enter our debugger */
else exit(0);
}
/**********************************************************************
* SIGNAL_trap
*
* SIGTRAP handler.
*/
static HANDLER_DEF(SIGNAL_trap)
{
HANDLER_INIT();
if (fnWINE_Debugger)
fnWINE_Debugger( signal, HANDLER_CONTEXT ); /* Enter our debugger */
}
/**********************************************************************
* SIGNAL_fault
*
* Segfault handler.
*/
static HANDLER_DEF(SIGNAL_fault)
{
const char *fault = "Segmentation fault";
HANDLER_INIT();
#ifdef __i386__
#if defined(TRAP_sig) && defined(CR2_sig)
if (TRAP_sig(HANDLER_CONTEXT) == 0x0e
&& VIRTUAL_HandleFault( (LPVOID)CR2_sig(HANDLER_CONTEXT) ))
return;
#endif
#if defined(TRAP_sig)
/* We don't do alignment checks */
/* FIXME: if we get SEHs, pass the fault through them first? */
if (TRAP_sig(HANDLER_CONTEXT) == 0x11) {
if (EFL_sig(HANDLER_CONTEXT) & 0x00040000) {
/* Disable AC flag, return */
EFL_sig(HANDLER_CONTEXT) &= ~0x00040000;
return;
}
}
#endif
if (fnINSTR_EmulateInstruction &&
fnINSTR_EmulateInstruction( HANDLER_CONTEXT )
)
return;
#ifdef TRAP_sig
if (TRAP_sig( HANDLER_CONTEXT ) < NB_TRAPS)
fault = SIGNAL_traps[TRAP_sig( HANDLER_CONTEXT )];
#endif
if (IS_SELECTOR_SYSTEM(CS_sig(HANDLER_CONTEXT)))
{
MSG("%s in 32-bit code (0x%08lx).\n", fault, EIP_sig(HANDLER_CONTEXT));
}
else
{
MSG("%s in 16-bit code (%04x:%04lx).\n", fault,
(WORD)CS_sig(HANDLER_CONTEXT), EIP_sig(HANDLER_CONTEXT) );
}
#ifdef CR2_sig
MSG("Fault address is 0x%08lx\n",CR2_sig(HANDLER_CONTEXT));
#endif
#endif
if (fnWINE_Debugger)
fnWINE_Debugger( signal, HANDLER_CONTEXT );
else {
MSG("stopping pid %d due to unhandled %s.\n",getpid(),fault);
kill(getpid(),SIGSTOP);
}
}
/**********************************************************************
* SIGNAL_InitHandlers
*/
void SIGNAL_InitHandlers(void)
{
SIGNAL_SetHandler( SIGINT, (void (*)())SIGNAL_break, 1);
SIGNAL_SetHandler( SIGSEGV, (void (*)())SIGNAL_fault, 1);
SIGNAL_SetHandler( SIGILL, (void (*)())SIGNAL_fault, 1);
SIGNAL_SetHandler( SIGFPE, (void (*)())SIGNAL_fault, 1);
SIGNAL_SetHandler( SIGTRAP, (void (*)())SIGNAL_trap, 1); /* debugger */
SIGNAL_SetHandler( SIGHUP, (void (*)())SIGNAL_trap, 1); /* forced break*/
#ifdef SIGBUS
SIGNAL_SetHandler( SIGBUS, (void (*)())SIGNAL_fault, 1);
#endif
return;
}
/**********************************************************************
* SIGNAL_Init
*/
BOOL SIGNAL_Init(void)
{
#ifdef HAVE_WORKING_SIGALTSTACK
struct sigaltstack ss;
ss.ss_sp = SIGNAL_Stack;
ss.ss_size = sizeof(SIGNAL_Stack);
ss.ss_flags = 0;
if (sigaltstack(&ss, NULL) < 0)
{
perror("sigaltstack");
return FALSE;
}
#endif /* HAVE_SIGALTSTACK */
sigemptyset(&async_signal_set);
SIGNAL_SetHandler( SIGCHLD, (void (*)())SIGNAL_child, 1);
#ifdef CONFIG_IPC
sigaddset(&async_signal_set, SIGUSR2);
SIGNAL_SetHandler( SIGUSR2, (void (*)())stop_wait, 1); /* For IPC */
#endif
#ifdef SIGIO
sigaddset(&async_signal_set, SIGIO);
/* SIGNAL_SetHandler( SIGIO, (void (*)())WINSOCK_sigio, 0); */
SIGNAL_SetHandler( SIGIO, (void (*)())ASYNC_sigio, 0);
#endif
sigaddset(&async_signal_set, SIGALRM);
/* ignore SIGPIPE so that WINSOCK can get a EPIPE error instead */
signal (SIGPIPE, SIG_IGN);
SIGNAL_InitHandlers();
return TRUE;
}
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