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// 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.
#include "runtime.h"
extern int32 debug;
static int8 spmark[] = "\xa7\xf1\xd9\x2a\x82\xc8\xd8\xfe";
extern uint8 end;
void
traceback(uint8 *pc, uint8 *sp, void* r15)
{
int32 spoff;
int8* spp;
uint8* callpc;
int32 counter;
int32 i;
int8* name;
G g;
Stktop *stktop;
// store local copy of per-process data block that we can write as we unwind
mcpy((byte*)&g, (byte*)r15, sizeof(G));
// if the PC is zero, it's probably due to a nil function pointer.
// pop the failed frame.
if(pc == nil) {
pc = ((uint8**)sp)[0];
sp += 8;
}
counter = 0;
name = "panic";
for(;;){
callpc = pc;
if((uint8*)retfromnewstack == pc) {
// call site is retfromnewstack(); pop to earlier stack block to get true caller
stktop = (Stktop*)g.stackbase;
g.stackbase = stktop->oldbase;
g.stackguard = stktop->oldguard;
sp = stktop->oldsp;
pc = ((uint8**)sp)[1];
sp += 16; // two irrelevant calls on stack - morestack, plus the call morestack made
continue;
}
/* find SP offset by stepping back through instructions to SP offset marker */
while(pc > (uint8*)0x1000+sizeof spmark-1) {
if(pc >= &end)
return;
for(spp = spmark; *spp != '\0' && *pc++ == (uint8)*spp++; )
;
if(*spp == '\0'){
spoff = *pc++;
spoff += *pc++ << 8;
spoff += *pc++ << 16;
name = (int8*)pc;
sp += spoff + 8;
break;
}
}
if(counter++ > 100){
prints("stack trace terminated\n");
break;
}
if((pc = ((uint8**)sp)[-1]) <= (uint8*)0x1000)
break;
/* print this frame */
prints("0x");
sys·printpointer(callpc);
prints("?zi\n");
prints("\t");
prints(name);
prints("(");
for(i = 0; i < 3; i++){
if(i != 0)
prints(", ");
sys·printint(((uint32*)sp)[i]);
}
prints(", ...)\n");
prints("\t");
prints(name);
prints("(");
for(i = 0; i < 3; i++){
if(i != 0)
prints(", ");
prints("0x");
sys·printpointer(((void**)sp)[i]);
}
prints(", ...)\n");
}
}
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