mirror of
https://github.com/golang/go
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105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "runtime.h"
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extern int32 debug;
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static int8 spmark[] = "\xa7\xf1\xd9\x2a\x82\xc8\xd8\xfe";
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//typedef struct U U;
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//struct U {
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// uint8* stackguard;
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// uint8* stackbase;
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// uint8* istackguard;
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// uint8* istackbase;
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//};
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typedef struct Stktop Stktop;
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struct Stktop {
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uint8* oldbase;
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uint8* oldsp;
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uint8* magic;
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uint8* oldguard;
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};
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extern void _morestack();
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extern void _endmorestack();
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void
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traceback(uint8 *pc, uint8 *sp, void* r15)
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{
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int32 spoff;
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int8* spp;
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uint8* callpc;
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int32 counter;
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int32 i;
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int8* name;
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U u;
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Stktop *stktop;
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// store local copy of per-process data block that we can write as we unwind
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mcpy((byte*)&u, (byte*)r15, sizeof(U));
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counter = 0;
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name = "panic";
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for(;;){
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callpc = pc;
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if((uint8*)_morestack < pc && pc < (uint8*)_endmorestack) {
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// call site in _morestack(); pop to earlier stack block to get true caller
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stktop = (Stktop*)u.stackbase;
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u.stackbase = stktop->oldbase;
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u.stackguard = stktop->oldguard;
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sp = stktop->oldsp;
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pc = ((uint8**)sp)[1];
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sp += 16; // two irrelevant calls on stack - morestack, plus the call morestack made
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continue;
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}
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/* find SP offset by stepping back through instructions to SP offset marker */
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while(pc > (uint8*)0x1000+sizeof spmark-1) {
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for(spp = spmark; *spp != '\0' && *pc++ == (uint8)*spp++; )
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;
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if(*spp == '\0'){
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spoff = *pc++;
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spoff += *pc++ << 8;
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spoff += *pc++ << 16;
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name = (int8*)pc;
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sp += spoff + 8;
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break;
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}
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}
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if(counter++ > 100){
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prints("stack trace terminated\n");
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break;
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}
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if((pc = ((uint8**)sp)[-1]) <= (uint8*)0x1000)
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break;
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/* print this frame */
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prints("0x");
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sys·printpointer(callpc);
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prints("?zi\n");
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prints("\t");
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prints(name);
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prints("(");
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for(i = 0; i < 3; i++){
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if(i != 0)
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prints(", ");
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sys·printint(((uint32*)sp)[i]);
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}
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prints(", ...)\n");
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prints("\t");
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prints(name);
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prints("(");
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for(i = 0; i < 3; i++){
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if(i != 0)
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prints(", ");
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prints("0x");
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sys·printpointer(((void**)sp)[i]);
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}
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prints(", ...)\n");
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/* print pc for next frame */
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}
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}
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