| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build darwin dragonfly freebsd linux nacl netbsd openbsd |
| |
| package runtime |
| |
| import "unsafe" |
| |
| func dumpregs(c *sigctxt) { |
| print("trap ", hex(c.trap()), "\n") |
| print("error ", hex(c.error()), "\n") |
| print("oldmask ", hex(c.oldmask()), "\n") |
| print("r0 ", hex(c.r0()), "\n") |
| print("r1 ", hex(c.r1()), "\n") |
| print("r2 ", hex(c.r2()), "\n") |
| print("r3 ", hex(c.r3()), "\n") |
| print("r4 ", hex(c.r4()), "\n") |
| print("r5 ", hex(c.r5()), "\n") |
| print("r6 ", hex(c.r6()), "\n") |
| print("r7 ", hex(c.r7()), "\n") |
| print("r8 ", hex(c.r8()), "\n") |
| print("r9 ", hex(c.r9()), "\n") |
| print("r10 ", hex(c.r10()), "\n") |
| print("fp ", hex(c.fp()), "\n") |
| print("ip ", hex(c.ip()), "\n") |
| print("sp ", hex(c.sp()), "\n") |
| print("lr ", hex(c.lr()), "\n") |
| print("pc ", hex(c.pc()), "\n") |
| print("cpsr ", hex(c.cpsr()), "\n") |
| print("fault ", hex(c.fault()), "\n") |
| } |
| |
| func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) { |
| _g_ := getg() |
| c := &sigctxt{info, ctxt} |
| |
| if sig == _SIGPROF { |
| sigprof((*byte)(unsafe.Pointer(uintptr(c.pc()))), (*byte)(unsafe.Pointer(uintptr(c.sp()))), (*byte)(unsafe.Pointer(uintptr(c.lr()))), gp, _g_.m) |
| return |
| } |
| |
| flags := int32(_SigThrow) |
| if sig < uint32(len(sigtable)) { |
| flags = sigtable[sig].flags |
| } |
| if c.sigcode() != _SI_USER && flags&_SigPanic != 0 { |
| // 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 = uintptr(c.sigcode()) |
| gp.sigcode1 = uintptr(c.fault()) |
| gp.sigpc = uintptr(c.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. |
| sp := c.sp() - 4 |
| c.set_sp(sp) |
| *(*uint32)(unsafe.Pointer(uintptr(sp))) = c.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 gp.sigpc != 0 { |
| c.set_lr(uint32(gp.sigpc)) |
| } |
| |
| // In case we are panicking from external C code |
| c.set_r10(uint32(uintptr(unsafe.Pointer(gp)))) |
| c.set_pc(uint32(funcPC(sigpanic))) |
| return |
| } |
| |
| if c.sigcode() == _SI_USER || flags&_SigNotify != 0 { |
| if sigsend(sig) { |
| return |
| } |
| } |
| |
| if flags&_SigKill != 0 { |
| exit(2) |
| } |
| |
| if flags&_SigThrow == 0 { |
| return |
| } |
| |
| _g_.m.throwing = 1 |
| _g_.m.caughtsig = gp |
| startpanic() |
| |
| if sig < uint32(len(sigtable)) { |
| print(sigtable[sig].name, "\n") |
| } else { |
| print("Signal ", sig, "\n") |
| } |
| |
| print("PC=", hex(c.pc()), "\n") |
| if _g_.m.lockedg != nil && _g_.m.ncgo > 0 && gp == _g_.m.g0 { |
| print("signal arrived during cgo execution\n") |
| gp = _g_.m.lockedg |
| } |
| print("\n") |
| |
| var docrash bool |
| if gotraceback(&docrash) > 0 { |
| goroutineheader(gp) |
| tracebacktrap(uintptr(c.pc()), uintptr(c.sp()), uintptr(c.lr()), gp) |
| tracebackothers(gp) |
| print("\n") |
| dumpregs(c) |
| } |
| |
| if docrash { |
| crash() |
| } |
| |
| exit(2) |
| } |