github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/pkg/runtime/signal_arm.c (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build darwin freebsd linux netbsd openbsd
     6  
     7  #include "runtime.h"
     8  #include "defs_GOOS_GOARCH.h"
     9  #include "os_GOOS.h"
    10  #include "signal_GOOS_GOARCH.h"
    11  #include "signals_GOOS.h"
    12  
    13  void
    14  runtime·dumpregs(Siginfo *info, void *ctxt)
    15  {
    16  	USED(info);
    17  	USED(ctxt);
    18  
    19  	runtime·printf("trap    %x\n", SIG_TRAP(info, ctxt));
    20  	runtime·printf("error   %x\n", SIG_ERROR(info, ctxt));
    21  	runtime·printf("oldmask %x\n", SIG_OLDMASK(info, ctxt));
    22  	runtime·printf("r0      %x\n", SIG_R0(info, ctxt));
    23  	runtime·printf("r1      %x\n", SIG_R1(info, ctxt));
    24  	runtime·printf("r2      %x\n", SIG_R2(info, ctxt));
    25  	runtime·printf("r3      %x\n", SIG_R3(info, ctxt));
    26  	runtime·printf("r4      %x\n", SIG_R4(info, ctxt));
    27  	runtime·printf("r5      %x\n", SIG_R5(info, ctxt));
    28  	runtime·printf("r6      %x\n", SIG_R6(info, ctxt));
    29  	runtime·printf("r7      %x\n", SIG_R7(info, ctxt));
    30  	runtime·printf("r8      %x\n", SIG_R8(info, ctxt));
    31  	runtime·printf("r9      %x\n", SIG_R9(info, ctxt));
    32  	runtime·printf("r10     %x\n", SIG_R10(info, ctxt));
    33  	runtime·printf("fp      %x\n", SIG_FP(info, ctxt));
    34  	runtime·printf("ip      %x\n", SIG_IP(info, ctxt));
    35  	runtime·printf("sp      %x\n", SIG_SP(info, ctxt));
    36  	runtime·printf("lr      %x\n", SIG_LR(info, ctxt));
    37  	runtime·printf("pc      %x\n", SIG_PC(info, ctxt));
    38  	runtime·printf("cpsr    %x\n", SIG_CPSR(info, ctxt));
    39  	runtime·printf("fault   %x\n", SIG_FAULT(info, ctxt));
    40  }
    41  
    42  void
    43  runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
    44  {
    45  	SigTab *t;
    46  	bool crash;
    47  
    48  	if(sig == SIGPROF) {
    49  		if(gp != m->g0 && gp != m->gsignal)
    50  			runtime·sigprof((uint8*)SIG_PC(info, ctxt), (uint8*)SIG_SP(info, ctxt), (uint8*)SIG_LR(info, ctxt), gp);
    51  		return;
    52  	}
    53  
    54  	t = &runtime·sigtab[sig];
    55  	if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
    56  		if(gp == nil || gp == m->g0)
    57  			goto Throw;
    58  
    59  		// Make it look like a call to the signal func.
    60  		// Have to pass arguments out of band since
    61  		// augmenting the stack frame would break
    62  		// the unwinding code.
    63  		gp->sig = sig;
    64  		gp->sigcode0 = SIG_CODE0(info, ctxt);
    65  		gp->sigcode1 = SIG_FAULT(info, ctxt);
    66  		gp->sigpc = SIG_PC(info, ctxt);
    67  
    68  		// We arrange lr, and pc to pretend the panicking
    69  		// function calls sigpanic directly.
    70  		// Always save LR to stack so that panics in leaf
    71  		// functions are correctly handled. This smashes
    72  		// the stack frame but we're not going back there
    73  		// anyway.
    74  		SIG_SP(info, ctxt) -= 4;
    75  		*(uint32*)SIG_SP(info, ctxt) = SIG_LR(info, ctxt);
    76  		// Don't bother saving PC if it's zero, which is
    77  		// probably a call to a nil func: the old link register
    78  		// is more useful in the stack trace.
    79  		if(gp->sigpc != 0)
    80  			SIG_LR(info, ctxt) = gp->sigpc;
    81  		// In case we are panicking from external C code
    82  		SIG_R10(info, ctxt) = (uintptr)gp;
    83  		SIG_R9(info, ctxt) = (uintptr)m;
    84  		SIG_PC(info, ctxt) = (uintptr)runtime·sigpanic;
    85  		return;
    86  	}
    87  
    88  	if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
    89  		if(runtime·sigsend(sig))
    90  			return;
    91  	if(t->flags & SigKill)
    92  		runtime·exit(2);
    93  	if(!(t->flags & SigThrow))
    94  		return;
    95  
    96  Throw:
    97  	if(runtime·panicking)	// traceback already printed
    98  		runtime·exit(2);
    99  	runtime·panicking = 1;
   100  
   101  	if(sig < 0 || sig >= NSIG)
   102  		runtime·printf("Signal %d\n", sig);
   103  	else
   104  		runtime·printf("%s\n", runtime·sigtab[sig].name);
   105  
   106  	runtime·printf("PC=%x\n", SIG_PC(info, ctxt));
   107  	if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
   108  		runtime·printf("signal arrived during cgo execution\n");
   109  		gp = m->lockedg;
   110  	}
   111  	runtime·printf("\n");
   112  
   113  	if(runtime·gotraceback(&crash)){
   114  		runtime·traceback((void*)SIG_PC(info, ctxt), (void*)SIG_SP(info, ctxt), (void*)SIG_LR(info, ctxt), gp);
   115  		runtime·tracebackothers(gp);
   116  		runtime·printf("\n");
   117  		runtime·dumpregs(info, ctxt);
   118  	}
   119  	
   120  	if(crash)
   121  		runtime·crash();
   122  
   123  	runtime·exit(2);
   124  }