// Go special registers. We inject sigpanic0 (instead of sigpanic),
	// which takes care of that.
	if shouldPushSigpanic(gp, pc, *(*uintptr)(unsafe.Pointer(sp))) {
		c.pushCall(abi.FuncPCABI0(sigpanic0), pc)
	} else {
		// Not safe to push the call. Just clobber the frame.
		c.set_rip(uint64(abi.FuncPCABI0(sigpanic0)))
	}
}

func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#include "textflag.h"

#ifndef GOARCH_amd64
TEXT ·sigpanic0(SB),NOSPLIT,$0-0
	JMP	·sigpanic<ABIInternal>(SB)
#endif

// See map.go comment on the need for this routine.
TEXT ·mapinitnoop<ABIInternal>(SB),NOSPLIT,$0-0

			flags = t.flags
			break
		}
	}
	if flags&_SigPanic != 0 && gp.throwsplit {
		// We can't safely sigpanic because it may grow the
		// stack. Abort in the signal handler instead.
		flags = (flags &^ _SigPanic) | _SigThrow
	}
	if flags&_SigGoExit != 0 {
		exits((*byte)(add(unsafe.Pointer(note), 9))) // Strip "go: exit " prefix.
	}
	if flags&_SigPanic != 0 {
		// Copy the error string from sigtramp's stack into m->notesig so

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

// This program will crash.
// We want to test unwinding from sigpanic into C code (without a C symbolizer).

/*
#cgo CFLAGS: -O0

char *pnil;

static int f1(void) {
	*pnil = 0;
	return 0;
}
*/
import "C"

func init() {

	if shouldPushSigpanic(gp, pc, uintptr(c.link())) {
		// Make it look the like faulting PC called sigpanic.
		c.set_link(uint64(pc))
	}

	// In case we are panicking from external C code
	sigpanicPC := uint64(abi.FuncPCABIInternal(sigpanic))
	c.set_r28(sigpanicPC >> 32 << 32) // RSB register
	c.set_r30(uint64(uintptr(unsafe.Pointer(gp))))
	c.set_pc(sigpanicPC)
}

func (c *sigctxt) pushCall(targetPC, resumePC uintptr) {

	{_SigPanic, "sys: trap: fault read"},  // SIGRFAULT
	{_SigPanic, "sys: trap: fault write"}, // SIGWFAULT

	// We can also recover from math errors.
	{_SigPanic, "sys: trap: divide error"}, // SIGINTDIV
	{_SigPanic, "sys: fp:"},                // SIGFLOAT

	// All other traps are normally handled as if they were marked SigThrow.
	// We mark them SigPanic here so that debug.SetPanicOnFault will work.

	// function sigpanic was called from the PC that faulted. It has
	// to be sigpanic, as the stack unwinding code in traceback.go
	// looks explicitly for it.
	//
	// To do this we call into runtime·setsigsegv, which sets the
	// appropriate state inside the g object. We give it the faulting
	// PC on the stack, then put it in the LR before calling sigpanic.

	// Build a 32-byte stack frame for us for this call.

	// Frame pointer unwinding won't visit the sigpanic frame, since
	// sigpanic will save the same frame pointer before calling into a panic
	// function.
	*(*uint64)(unsafe.Pointer(uintptr(sp - goarch.PtrSize))) = c.r29()

	pc := gp.sigpc

	if shouldPushSigpanic(gp, pc, uintptr(c.lr())) {
		// Make it look the like faulting PC called sigpanic.
		c.set_lr(uint64(pc))
	}

func (c *sigctxt) fault() uintptr { return uintptr(c.sigaddr()) }

// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
	// We arrange link, and pc to pretend the panicking
	// function calls sigpanic directly.
	// Always save LINK to stack so that panics in leaf
	// functions are correctly handled. This smashes

func (c *sigctxt) siglr() uintptr { return uintptr(c.lr()) }

// preparePanic sets up the stack to look like a call to sigpanic.
func (c *sigctxt) preparePanic(sig uint32, gp *g) {
	// 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