StackTrace-x86.cc

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00001 /*
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00006  * 
00007  * Intel Open Source License 
00008  * 
00009  * Copyright (c) 2005 Intel Corporation. All rights reserved. 
00010  * 
00011  * Redistribution and use in source and binary forms, with or without
00012  * modification, are permitted provided that the following conditions are
00013  * met:
00014  * 
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00018  *   Redistributions in binary form must reproduce the above copyright
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00020  *   documentation and/or other materials provided with the distribution.
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00024  *   this software without specific prior written permission.
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00038 
00039 #if defined(__i386__)
00040 
00041 #include "FatalSignals.h"
00042 
00043 #if defined(__linux__)
00044 #include <asm/sigcontext.h>
00045 struct sigframe
00046 {
00047         char *pretcode;
00048         int sig;
00049         struct sigcontext sc;
00050         struct _fpstate fpstate;
00051 };
00052 #endif
00053 
00054 // Generally, this function just follows the frame pointer and looks
00055 // at the return address (i.e. the next one on the stack).
00056 //
00057 // Things get a little funky in the frame for the signal handler
00058 // (identified by the parameter sighandler_frame), where we need to
00059 // look into the place where the kernel stored the faulting address.
00060 size_t
00061 StackTrace::get_trace(void* stack[], size_t size, u_int sighandler_frame)
00062 {
00063     void **fp;
00064 
00065     asm volatile("movl %%ebp,%0" : "=r" (fp));
00066 
00067     stack[0] = 0; // fake frame for this this fn, just use 0
00068     size_t frame = 1;
00069     while (frame < size) {
00070         if (*(fp + 1) == 0 || *fp == 0)
00071             break;
00072         
00073         if (sighandler_frame != 0 && frame == sighandler_frame) {
00074 #if defined(__linux__) 
00075             struct sigframe* sf = (struct sigframe*)(fp+1);
00076             struct sigcontext* scxt = &(sf->sc);
00077             stack[frame] = (void*) scxt->eip;
00078 #else
00079             stack[frame] = *(fp + 1);
00080 #endif 
00081         } else {
00082             stack[frame] = *(fp + 1);
00083         }
00084         
00085         fp = (void **)(*fp);
00086         ++frame;
00087     }
00088 
00089     return frame;
00090 }
00091 
00092 #endif /* __i386__ */

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