github.com/spotify/syslog-redirector-golang@v0.0.0-20140320174030-4859f03d829a/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 dragonfly 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  		runtime·sigprof((uint8*)SIG_PC(info, ctxt), (uint8*)SIG_SP(info, ctxt), (uint8*)SIG_LR(info, ctxt), gp);
    50  		return;
    51  	}
    52  
    53  	t = &runtime·sigtab[sig];
    54  	if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
    55  		if(gp == nil || gp == m->g0)
    56  			goto Throw;
    57  
    58  		// Make it look like a call to the signal func.
    59  		// Have to pass arguments out of band since
    60  		// augmenting the stack frame would break
    61  		// the unwinding code.
    62  		gp->sig = sig;
    63  		gp->sigcode0 = SIG_CODE0(info, ctxt);
    64  		gp->sigcode1 = SIG_FAULT(info, ctxt);
    65  		gp->sigpc = SIG_PC(info, ctxt);
    66  
    67  		// We arrange lr, and pc to pretend the panicking
    68  		// function calls sigpanic directly.
    69  		// Always save LR to stack so that panics in leaf
    70  		// functions are correctly handled. This smashes
    71  		// the stack frame but we're not going back there
    72  		// anyway.
    73  		SIG_SP(info, ctxt) -= 4;
    74  		*(uint32*)SIG_SP(info, ctxt) = SIG_LR(info, ctxt);
    75  		// Don't bother saving PC if it's zero, which is
    76  		// probably a call to a nil func: the old link register
    77  		// is more useful in the stack trace.
    78  		if(gp->sigpc != 0)
    79  			SIG_LR(info, ctxt) = gp->sigpc;
    80  		// In case we are panicking from external C code
    81  		SIG_R10(info, ctxt) = (uintptr)gp;
    82  		SIG_R9(info, ctxt) = (uintptr)m;
    83  		SIG_PC(info, ctxt) = (uintptr)runtime·sigpanic;
    84  		return;
    85  	}
    86  
    87  	if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
    88  		if(runtime·sigsend(sig))
    89  			return;
    90  	if(t->flags & SigKill)
    91  		runtime·exit(2);
    92  	if(!(t->flags & SigThrow))
    93  		return;
    94  
    95  Throw:
    96  	m->throwing = 1;
    97  	m->caughtsig = gp;
    98  	if(runtime·panicking)	// traceback already printed
    99  		runtime·exit(2);
   100  	runtime·panicking = 1;
   101  
   102  	if(sig < 0 || sig >= NSIG)
   103  		runtime·printf("Signal %d\n", sig);
   104  	else
   105  		runtime·printf("%s\n", runtime·sigtab[sig].name);
   106  
   107  	runtime·printf("PC=%x\n", SIG_PC(info, ctxt));
   108  	if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
   109  		runtime·printf("signal arrived during cgo execution\n");
   110  		gp = m->lockedg;
   111  	}
   112  	runtime·printf("\n");
   113  
   114  	if(runtime·gotraceback(&crash)){
   115  		runtime·traceback(SIG_PC(info, ctxt), SIG_SP(info, ctxt), SIG_LR(info, ctxt), gp);
   116  		runtime·tracebackothers(gp);
   117  		runtime·printf("\n");
   118  		runtime·dumpregs(info, ctxt);
   119  	}
   120  	
   121  	if(crash)
   122  		runtime·crash();
   123  
   124  	runtime·exit(2);
   125  }