void
runtime·dopanic(int32 unused)
{
static bool didothers;
if(g->sig != 0)
runtime·printf("[signal %x code=%p addr=%p pc=%p]\n",
g->sig, g->sigcode0, g->sigcode1, g->sigpc);
if(runtime·gotraceback()){
if(g != m->g0) {
runtime·printf("\n");
runtime·goroutineheader(g);
runtime·traceback(runtime·getcallerpc(&unused), runtime·getcallersp(&unused), 0, g);
}
if(!didothers) {
didothers = true;
runtime·tracebackothers(g);
}
}
runtime·unlock(&paniclk);
if(runtime·xadd(&runtime·panicking, -1) != 0) {
// Some other m is panicking too.
// Let it print what it needs to print.
// Wait forever without chewing up cpu.
// It will exit when it's done.
static Lock deadlock;
runtime·lock(&deadlock);
runtime·lock(&deadlock);
}
runtime·exit(2);
}
// lastcontinuehandler is reached, because runtime cannot handle
// current exception. lastcontinuehandler will print crash info and exit.
uint32
runtime·lastcontinuehandler(ExceptionRecord *info, Context *r, G *gp)
{
bool crash;
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
runtime·printf("Exception %x %p %p %p\n", info->ExceptionCode,
(uintptr)info->ExceptionInformation[0], (uintptr)info->ExceptionInformation[1], (uintptr)r->Eip);
runtime·printf("PC=%x\n", r->Eip);
if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = g->m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback(&crash)){
runtime·traceback(r->Eip, r->Esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
if(crash)
runtime·crash();
runtime·exit(2);
return 0; // not reached
}
uint32
runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
{
uintptr *sp;
switch(info->ExceptionCode) {
case EXCEPTION_BREAKPOINT:
r->Eip--; // because 8l generates 2 bytes for INT3
return 1;
}
if(gp != nil && runtime·issigpanic(info->ExceptionCode)) {
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = info->ExceptionCode;
gp->sigcode0 = info->ExceptionInformation[0];
gp->sigcode1 = info->ExceptionInformation[1];
gp->sigpc = r->Eip;
// Only push runtime·sigpanic if r->eip != 0.
// If r->eip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(r->Eip != 0) {
sp = (uintptr*)r->Esp;
*--sp = r->Eip;
r->Esp = (uintptr)sp;
}
r->Eip = (uintptr)runtime·sigpanic;
return 0;
}
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
runtime·printf("Exception %x %p %p\n", info->ExceptionCode,
info->ExceptionInformation[0], info->ExceptionInformation[1]);
runtime·printf("PC=%x\n", r->Eip);
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->Eip, (void*)r->Esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
return 0;
}
void
sighandler(int32 sig, Siginfo *info, void *context)
{
Ucontext *uc;
Mcontext *mc;
Regs *r;
if(sigtab[sig].flags & SigQueue) {
if(sigsend(sig) || (sigtab[sig].flags & SigIgnore))
return;
exit(2); // SIGINT, SIGTERM, etc
}
if(panicking) // traceback already printed
exit(2);
panicking = 1;
if(sig < 0 || sig >= NSIG){
printf("Signal %d\n", sig);
}else{
printf("%s\n", sigtab[sig].name);
}
uc = context;
mc = uc->uc_mcontext;
r = &mc->ss;
printf("Faulting address: %p\n", info->si_addr);
printf("pc: %X\n", r->rip);
printf("\n");
if(gotraceback()){
traceback((void*)r->rip, (void*)r->rsp, (void*)r->r15);
tracebackothers((void*)r->r15);
dumpregs(r);
}
breakpoint();
exit(2);
}
void
sighandler(int32 sig, Siginfo* info, void* context)
{
Ucontext *uc;
Mcontext *mc;
if(sigtab[sig].flags & SigQueue) {
if(sigsend(sig) || (sigtab[sig].flags & SigIgnore))
return;
exit(2); // SIGINT, SIGTERM, etc
}
if(panicking) // traceback already printed
exit(2);
panicking = 1;
uc = context;
mc = &uc->uc_mcontext;
if(sig < 0 || sig >= NSIG)
printf("Signal %d\n", sig);
else
printf("%s\n", sigtab[sig].name);
printf("Faulting address: %p\n", info->si_addr);
printf("PC=%X\n", mc->mc_eip);
printf("\n");
if(gotraceback()){
traceback((void*)mc->mc_eip, (void*)mc->mc_esp, m->curg);
tracebackothers(m->curg);
dumpregs(mc);
}
breakpoint();
exit(2);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Sigcontext *r;
SigTab *t;
uc = context;
r = &uc->uc_mcontext;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->arm_pc, (uint8*)r->arm_sp, (uint8*)r->arm_lr, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->si_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil)
goto Throw;
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = r->fault_address;
gp->sigpc = r->arm_pc;
// If this is a leaf function, we do smash LR,
// but we're not going back there anyway.
// Don't bother smashing if r->arm_pc is 0,
// which is probably a call to a nil func: the
// old link register is more useful in the stack trace.
if(r->arm_pc != 0)
r->arm_lr = r->arm_pc;
// In case we are panicking from external C code
r->arm_r10 = (uintptr)gp;
r->arm_r9 = (uintptr)m;
r->arm_pc = (uintptr)runtime·sigpanic;
return;
}
if(info->si_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%x\n", r->arm_pc);
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->arm_pc, (void*)r->arm_sp, (void*)r->arm_lr, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(r);
}
// breakpoint();
runtime·exit(2);
}
int32
runtime·sighandler(void *v, int8 *note, G *gp)
{
uintptr *sp;
SigTab *t;
bool crash;
Ureg *ureg;
intgo len, n;
int32 sig, flags;
ureg = (Ureg*)v;
// The kernel will never pass us a nil note or ureg so we probably
// made a mistake somewhere in runtime·sigtramp.
if(ureg == nil || note == nil) {
runtime·printf("sighandler: ureg %p note %p\n", ureg, note);
goto Throw;
}
// Check that the note is no more than ERRMAX bytes (including
// the trailing NUL). We should never receive a longer note.
len = runtime·findnull((byte*)note);
if(len > ERRMAX-1) {
runtime·printf("sighandler: note is longer than ERRMAX\n");
goto Throw;
}
// See if the note matches one of the patterns in runtime·sigtab.
// Notes that do not match any pattern can be handled at a higher
// level by the program but will otherwise be ignored.
flags = SigNotify;
for(sig = 0; sig < nelem(runtime·sigtab); sig++) {
t = &runtime·sigtab[sig];
n = runtime·findnull((byte*)t->name);
if(len < n)
continue;
if(runtime·strncmp((byte*)note, (byte*)t->name, n) == 0) {
flags = t->flags;
break;
}
}
if(flags & SigGoExit)
runtime·exits(note+9); // Strip "go: exit " prefix.
if(flags & SigPanic) {
// Copy the error string from sigtramp's stack into m->notesig so
// we can reliably access it from the panic routines.
runtime·memmove(g->m->notesig, note, len+1);
gp->sig = sig;
gp->sigpc = ureg->ip;
// Only push runtime·sigpanic if PC != 0.
//
// If PC == 0, probably panicked because of a call to a nil func.
// Not pushing that onto SP will make the trace look like a call
// to runtime·sigpanic instead. (Otherwise the trace will end at
// runtime·sigpanic and we won't get to see who faulted).
if(ureg->ip != 0) {
sp = (uintptr*)ureg->sp;
*--sp = ureg->ip;
ureg->sp = (uint64)sp;
}
ureg->ip = (uintptr)runtime·sigpanic;
return NCONT;
}
if(flags & SigNotify) {
// TODO(ality): See if os/signal wants it.
//if(runtime·sigsend(...))
// return NCONT;
}
if(flags & SigKill)
goto Exit;
if(!(flags & SigThrow))
return NCONT;
Throw:
g->m->throwing = 1;
g->m->caughtsig = gp;
runtime·startpanic();
runtime·printf("%s\n", note);
runtime·printf("PC=%X\n", ureg->ip);
runtime·printf("\n");
if(runtime·gotraceback(&crash)) {
runtime·goroutineheader(gp);
runtime·traceback(ureg->ip, ureg->sp, 0, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(ureg);
}
if(crash)
runtime·crash();
Exit:
runtime·goexitsall(note);
runtime·exits(note);
return NDFLT; // not reached
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Sigcontext *r;
uintptr *sp;
SigTab *t;
uc = context;
r = &uc->uc_mcontext;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->eip, (uint8*)r->esp, nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->si_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil)
goto Throw;
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = ((uintptr*)info)[3];
gp->sigpc = r->eip;
// Only push runtime·sigpanic if r->eip != 0.
// If r->eip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(r->eip != 0) {
sp = (uintptr*)r->esp;
*--sp = r->eip;
r->esp = (uintptr)sp;
}
r->eip = (uintptr)runtime·sigpanic;
return;
}
if(info->si_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
runtime·startpanic();
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%X\n", r->eip);
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->eip, (void*)r->esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Mcontext *mc;
Sigcontext *r;
uintptr *sp;
uc = context;
mc = &uc->uc_mcontext;
r = (Sigcontext*)mc; // same layout, more conveient names
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->rip, (uint8*)r->rsp, nil, gp);
return;
}
if(gp != nil && (runtime·sigtab[sig].flags & SigPanic)) {
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = ((uintptr*)info)[2];
gp->sigpc = r->rip;
// Only push runtime·sigpanic if r->rip != 0.
// If r->rip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(r->rip != 0) {
sp = (uintptr*)r->rsp;
*--sp = r->rip;
r->rsp = (uintptr)sp;
}
r->rip = (uintptr)runtime·sigpanic;
return;
}
if(runtime·sigtab[sig].flags & SigQueue) {
if(runtime·sigsend(sig) || (runtime·sigtab[sig].flags & SigIgnore))
return;
runtime·exit(2); // SIGINT, SIGTERM, etc
}
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%X\n", r->rip);
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->rip, (void*)r->rsp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
int32
runtime·sighandler(void *v, int8 *s, G *gp)
{
bool crash;
Ureg *ureg;
uintptr *sp;
SigTab *sig, *nsig;
intgo len, i;
if(!s)
return NCONT;
len = runtime·findnull((byte*)s);
if(len <= 4 || runtime·mcmp((byte*)s, (byte*)"sys:", 4) != 0)
return NDFLT;
nsig = nil;
sig = runtime·sigtab;
for(i=0; i < NSIG; i++) {
if(runtime·strstr((byte*)s, (byte*)sig->name)) {
nsig = sig;
break;
}
sig++;
}
if(nsig == nil)
return NDFLT;
ureg = v;
if(nsig->flags & SigPanic) {
if(gp == nil || m->notesig == 0)
goto Throw;
// Copy the error string from sigtramp's stack into m->notesig so
// we can reliably access it from the panic routines. We can't use
// runtime·memmove here since it will use SSE instructions for big
// copies. The Plan 9 kernel doesn't allow floating point in note
// handlers.
//
// TODO(ality): revert back to memmove when the kernel is fixed.
if(len >= ERRMAX)
len = ERRMAX-1;
for(i = 0; i < len; i++)
m->notesig[i] = s[i];
m->notesig[i] = '\0';
gp->sig = i;
gp->sigpc = ureg->pc;
// Only push runtime·sigpanic if ureg->pc != 0.
// If ureg->pc == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(ureg->pc != 0) {
sp = (uintptr*)ureg->sp;
*--sp = ureg->pc;
ureg->sp = (uint32)sp;
}
ureg->pc = (uintptr)runtime·sigpanic;
return NCONT;
}
if(!(nsig->flags & SigThrow))
return NDFLT;
Throw:
m->throwing = 1;
m->caughtsig = gp;
runtime·startpanic();
runtime·printf("%s\n", s);
runtime·printf("PC=%X\n", ureg->pc);
runtime·printf("\n");
if(runtime·gotraceback(&crash)) {
runtime·traceback(ureg->pc, ureg->sp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(ureg);
}
if(crash)
runtime·crash();
runtime·goexitsall("");
runtime·exits(s);
return 0;
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
{
uintptr *sp;
SigTab *t;
bool crash;
if(sig == SIGPROF) {
runtime·sigprof((byte*)SIG_RIP(info, ctxt), (byte*)SIG_RSP(info, ctxt), nil, gp, g->m);
return;
}
#ifdef GOOS_darwin
// x86-64 has 48-bit virtual addresses. The top 16 bits must echo bit 47.
// The hardware delivers a different kind of fault for a malformed address
// than it does for an attempt to access a valid but unmapped address.
// OS X 10.9.2 mishandles the malformed address case, making it look like
// a user-generated signal (like someone ran kill -SEGV ourpid).
// We pass user-generated signals to os/signal, or else ignore them.
// Doing that here - and returning to the faulting code - results in an
// infinite loop. It appears the best we can do is rewrite what the kernel
// delivers into something more like the truth. The address used below
// has very little chance of being the one that caused the fault, but it is
// malformed, it is clearly not a real pointer, and if it does get printed
// in real life, people will probably search for it and find this code.
// There are no Google hits for b01dfacedebac1e or 0xb01dfacedebac1e
// as I type this comment.
if(sig == SIGSEGV && SIG_CODE0(info, ctxt) == SI_USER) {
SIG_CODE0(info, ctxt) = SI_USER+1;
info->si_addr = (void*)(uintptr)0xb01dfacedebac1eULL;
}
#endif
t = &runtime·sigtab[sig];
if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = SIG_CODE0(info, ctxt);
gp->sigcode1 = SIG_CODE1(info, ctxt);
gp->sigpc = SIG_RIP(info, ctxt);
#ifdef GOOS_darwin
// Work around Leopard bug that doesn't set FPE_INTDIV.
// Look at instruction to see if it is a divide.
// Not necessary in Snow Leopard (si_code will be != 0).
if(sig == SIGFPE && gp->sigcode0 == 0) {
byte *pc;
pc = (byte*)gp->sigpc;
if((pc[0]&0xF0) == 0x40) // 64-bit REX prefix
pc++;
else if(pc[0] == 0x66) // 16-bit instruction prefix
pc++;
if(pc[0] == 0xF6 || pc[0] == 0xF7)
gp->sigcode0 = FPE_INTDIV;
}
#endif
// Only push runtime·sigpanic if rip != 0.
// If rip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(SIG_RIP(info, ctxt) != 0) {
sp = (uintptr*)SIG_RSP(info, ctxt);
if(sizeof(uintreg) > sizeof(uintptr))
*--sp = 0;
*--sp = SIG_RIP(info, ctxt);
SIG_RSP(info, ctxt) = (uintptr)sp;
}
SIG_RIP(info, ctxt) = (uintptr)runtime·sigpanic;
return;
}
if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
g->m->throwing = 1;
g->m->caughtsig = gp;
runtime·startpanic();
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%X\n", SIG_RIP(info, ctxt));
if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = g->m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback(&crash)){
runtime·goroutineheader(gp);
runtime·traceback(SIG_RIP(info, ctxt), SIG_RSP(info, ctxt), 0, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(info, ctxt);
}
if(crash)
runtime·crash();
runtime·exit(2);
}
int32
runtime·sighandler(void *v, int8 *s, G *gp)
{
Ureg *ureg;
uintptr *sp;
SigTab *sig, *nsig;
int32 len, i;
if(!s)
return NCONT;
len = runtime·findnull((byte*)s);
if(len <= 4 || runtime·mcmp((byte*)s, (byte*)"sys:", 4) != 0)
return NDFLT;
nsig = nil;
sig = runtime·sigtab;
for(i=0; i < NSIG; i++) {
if(runtime·strstr((byte*)s, (byte*)sig->name)) {
nsig = sig;
break;
}
sig++;
}
if(nsig == nil)
return NDFLT;
ureg = v;
if(nsig->flags & SigPanic) {
if(gp == nil || m->notesig == 0)
goto Throw;
// Save error string from sigtramp's stack,
// into gsignal->sigcode0, so we can reliably
// access it from the panic routines.
if(len > ERRMAX)
len = ERRMAX;
runtime·memmove((void*)m->notesig, (void*)s, len);
gp->sig = i;
gp->sigpc = ureg->pc;
// Only push runtime·sigpanic if ureg->pc != 0.
// If ureg->pc == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(ureg->pc != 0) {
sp = (uintptr*)ureg->sp;
*--sp = ureg->pc;
ureg->sp = (uint32)sp;
}
ureg->pc = (uintptr)runtime·sigpanic;
return NCONT;
}
if(!(nsig->flags & SigThrow))
return NDFLT;
Throw:
runtime·startpanic();
runtime·printf("%s\n", s);
runtime·printf("PC=%X\n", ureg->pc);
runtime·printf("\n");
if(runtime·gotraceback()) {
runtime·traceback((void*)ureg->pc, (void*)ureg->sp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(ureg);
}
runtime·goexitsall("");
runtime·exits(s);
return 0;
}
// Called by sigtramp from Windows VEH handler.
// Return value signals whether the exception has been handled (-1)
// or should be made available to other handlers in the chain (0).
uint32
runtime·sighandler(ExceptionRecord *info, Context *r, G *gp)
{
bool crash;
uintptr *sp;
extern byte text[], etext[];
if(info->ExceptionCode == DBG_PRINTEXCEPTION_C) {
// This exception is intended to be caught by debuggers.
// There is a not-very-informational message like
// "Invalid parameter passed to C runtime function"
// sitting at info->ExceptionInformation[0] (a wchar_t*),
// with length info->ExceptionInformation[1].
// The default behavior is to ignore this exception,
// but somehow returning 0 here (meaning keep going)
// makes the program crash instead. Maybe Windows has no
// other handler registered? In any event, ignore it.
return -1;
}
// Only handle exception if executing instructions in Go binary
// (not Windows library code).
if(r->Rip < (uint64)text || (uint64)etext < r->Rip)
return 0;
switch(info->ExceptionCode) {
case EXCEPTION_BREAKPOINT:
// It is unclear whether this is needed, unclear whether it
// would work, and unclear how to test it. Leave out for now.
// This only handles breakpoint instructions written in the
// assembly sources, not breakpoints set by a debugger, and
// there are very few of the former.
break;
}
if(gp != nil && runtime·issigpanic(info->ExceptionCode)) {
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = info->ExceptionCode;
gp->sigcode0 = info->ExceptionInformation[0];
gp->sigcode1 = info->ExceptionInformation[1];
gp->sigpc = r->Rip;
// Only push runtime·sigpanic if r->rip != 0.
// If r->rip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(r->Rip != 0) {
sp = (uintptr*)r->Rsp;
*--sp = r->Rip;
r->Rsp = (uintptr)sp;
}
r->Rip = (uintptr)runtime·sigpanic;
return -1;
}
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
runtime·printf("Exception %x %p %p %p\n", info->ExceptionCode,
info->ExceptionInformation[0], info->ExceptionInformation[1], r->Rip);
runtime·printf("PC=%X\n", r->Rip);
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback(&crash)){
runtime·traceback(r->Rip, r->Rsp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
if(crash)
runtime·crash();
runtime·exit(2);
return -1; // not reached
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
UcontextT *uc = context;
McontextT *mc = &uc->uc_mcontext;
uintptr *sp;
SigTab *t;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)mc->__gregs[REG_EIP],
(uint8*)mc->__gregs[REG_UESP], nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// Make it look like a call to the signal func.
// We need to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->_code;
gp->sigcode1 = *(uintptr*)&info->_reason[0]; /* _addr */
gp->sigpc = mc->__gregs[REG_EIP];
// Only push runtime·sigpanic if __gregs[REG_EIP] != 0.
// If __gregs[REG_EIP] == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will make the
// trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic
// and we won't get to see who faulted.)
if(mc->__gregs[REG_EIP] != 0) {
sp = (uintptr*)mc->__gregs[REG_UESP];
*--sp = mc->__gregs[REG_EIP];
mc->__gregs[REG_UESP] = (uintptr)sp;
}
mc->__gregs[REG_EIP] = (uintptr)runtime·sigpanic;
return;
}
if(info->_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
runtime·startpanic();
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%X\n", mc->__gregs[REG_EIP]);
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)mc->__gregs[REG_EIP],
(void*)mc->__gregs[REG_UESP], 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(mc);
}
runtime·exit(2);
}
void
sighandler(int32 sig, Siginfo *info, void *context)
{
Ucontext *uc;
Mcontext *mc;
Regs *r;
G *gp;
uintptr *sp;
byte *pc;
uc = context;
mc = uc->uc_mcontext;
r = &mc->ss;
if((gp = m->curg) != nil && (sigtab[sig].flags & SigPanic)) {
// Work around Leopard bug that doesn't set FPE_INTDIV.
// Look at instruction to see if it is a divide.
// Not necessary in Snow Leopard (si_code will be != 0).
if(sig == SIGFPE && info->si_code == 0) {
pc = (byte*)r->rip;
if((pc[0]&0xF0) == 0x40) // 64-bit REX prefix
pc++;
if(pc[0] == 0xF7)
info->si_code = FPE_INTDIV;
}
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = (uintptr)info->si_addr;
// Only push sigpanic if r->rip != 0.
// If r->rip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to sigpanic instead.
// (Otherwise the trace will end at sigpanic and we
// won't get to see who faulted.)
if(r->rip != 0) {
sp = (uintptr*)r->rsp;
*--sp = r->rip;
r->rsp = (uintptr)sp;
}
r->rip = (uintptr)sigpanic;
return;
}
if(sigtab[sig].flags & SigQueue) {
if(sigsend(sig) || (sigtab[sig].flags & SigIgnore))
return;
exit(2); // SIGINT, SIGTERM, etc
}
if(panicking) // traceback already printed
exit(2);
panicking = 1;
if(sig < 0 || sig >= NSIG){
printf("Signal %d\n", sig);
}else{
printf("%s\n", sigtab[sig].name);
}
printf("pc: %X\n", r->rip);
printf("\n");
if(gotraceback()){
traceback((void*)r->rip, (void*)r->rsp, 0, (void*)r->r15);
tracebackothers((void*)r->r15);
dumpregs(r);
}
breakpoint();
exit(2);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
{
uintptr *sp;
SigTab *t;
bool crash;
if(sig == SIGPROF) {
if(gp != m->g0 && gp != m->gsignal)
runtime·sigprof((byte*)SIG_RIP(info, ctxt), (byte*)SIG_RSP(info, ctxt), nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = SIG_CODE0(info, ctxt);
gp->sigcode1 = SIG_CODE1(info, ctxt);
gp->sigpc = SIG_RIP(info, ctxt);
#ifdef GOOS_darwin
// Work around Leopard bug that doesn't set FPE_INTDIV.
// Look at instruction to see if it is a divide.
// Not necessary in Snow Leopard (si_code will be != 0).
if(sig == SIGFPE && gp->sigcode0 == 0) {
byte *pc;
pc = (byte*)gp->sigpc;
if((pc[0]&0xF0) == 0x40) // 64-bit REX prefix
pc++;
else if(pc[0] == 0x66) // 16-bit instruction prefix
pc++;
if(pc[0] == 0xF6 || pc[0] == 0xF7)
gp->sigcode0 = FPE_INTDIV;
}
#endif
// Only push runtime·sigpanic if rip != 0.
// If rip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(SIG_RIP(info, ctxt) != 0) {
sp = (uintptr*)SIG_RSP(info, ctxt);
*--sp = SIG_RIP(info, ctxt);
SIG_RSP(info, ctxt) = (uintptr)sp;
}
SIG_RIP(info, ctxt) = (uintptr)runtime·sigpanic;
return;
}
if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
m->throwing = 1;
m->caughtsig = gp;
runtime·startpanic();
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%X\n", SIG_RIP(info, ctxt));
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback(&crash)){
runtime·traceback(SIG_RIP(info, ctxt), SIG_RSP(info, ctxt), 0, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(info, ctxt);
}
if(crash)
runtime·crash();
runtime·exit(2);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Mcontext32 *mc;
Regs32 *r;
uintptr *sp;
byte *pc;
SigTab *t;
uc = context;
mc = uc->uc_mcontext;
r = &mc->ss;
if(sig == SIGPROF) {
if(gp != m->g0 && gp != m->gsignal)
runtime·sigprof((uint8*)r->eip, (uint8*)r->esp, nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->si_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// Work around Leopard bug that doesn't set FPE_INTDIV.
// Look at instruction to see if it is a divide.
// Not necessary in Snow Leopard (si_code will be != 0).
if(sig == SIGFPE && info->si_code == 0) {
pc = (byte*)r->eip;
if(pc[0] == 0x66) // 16-bit instruction prefix
pc++;
if(pc[0] == 0xF6 || pc[0] == 0xF7)
info->si_code = FPE_INTDIV;
}
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = (uintptr)info->si_addr;
gp->sigpc = r->eip;
// Only push runtime·sigpanic if r->eip != 0.
// If r->eip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(r->eip != 0) {
sp = (uintptr*)r->esp;
*--sp = r->eip;
r->esp = (uintptr)sp;
}
r->eip = (uintptr)runtime·sigpanic;
return;
}
if(info->si_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
runtime·startpanic();
if(sig < 0 || sig >= NSIG){
runtime·printf("Signal %d\n", sig);
}else{
runtime·printf("%s\n", runtime·sigtab[sig].name);
}
runtime·printf("PC=%x\n", r->eip);
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->eip, (void*)r->esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Sigcontext *r;
SigTab *t;
uc = context;
r = &uc->uc_mcontext;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->arm_pc, (uint8*)r->arm_sp, (uint8*)r->arm_lr, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->si_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = r->fault_address;
gp->sigpc = r->arm_pc;
// We arrange lr, and pc to pretend the panicking
// function calls sigpanic directly.
// Always save LR to stack so that panics in leaf
// functions are correctly handled. This smashes
// the stack frame but we're not going back there
// anyway.
r->arm_sp -= 4;
*(uint32 *)r->arm_sp = r->arm_lr;
// Don't bother saving PC if it's zero, which is
// probably a call to a nil func: the old link register
// is more useful in the stack trace.
if(r->arm_pc != 0)
r->arm_lr = r->arm_pc;
// In case we are panicking from external C code
r->arm_r10 = (uintptr)gp;
r->arm_r9 = (uintptr)m;
r->arm_pc = (uintptr)runtime·sigpanic;
return;
}
if(info->si_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%x\n", r->arm_pc);
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback()) {
runtime·traceback((void*)r->arm_pc, (void*)r->arm_sp, (void*)r->arm_lr, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(r);
}
// breakpoint();
runtime·exit(2);
}
void
sighandler(int32 sig, Siginfo* info, void* context)
{
Ucontext *uc;
Mcontext *r;
G *gp;
uintptr *sp;
uc = context;
r = &uc->uc_mcontext;
if((gp = m->curg) != nil && (sigtab[sig].flags & SigPanic)) {
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = info->si_code;
gp->sigcode1 = (uintptr)info->si_addr;
// Only push sigpanic if r->mc_rip != 0.
// If r->mc_rip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to sigpanic instead.
// (Otherwise the trace will end at sigpanic and we
// won't get to see who faulted.)
if(r->mc_rip != 0) {
sp = (uintptr*)r->mc_rsp;
*--sp = r->mc_rip;
r->mc_rsp = (uintptr)sp;
}
r->mc_rip = (uintptr)sigpanic;
return;
}
if(sigtab[sig].flags & SigQueue) {
if(sigsend(sig) || (sigtab[sig].flags & SigIgnore))
return;
exit(2); // SIGINT, SIGTERM, etc
}
if(panicking) // traceback already printed
exit(2);
panicking = 1;
if(sig < 0 || sig >= NSIG)
printf("Signal %d\n", sig);
else
printf("%s\n", sigtab[sig].name);
printf("PC=%X\n", r->mc_rip);
printf("\n");
if(gotraceback()){
traceback((void*)r->mc_rip, (void*)r->mc_rsp, 0, (void*)r->mc_r15);
tracebackothers((void*)r->mc_r15);
dumpregs(r);
}
breakpoint();
exit(2);
}
