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527f2f9057
* Create a branch for some evul shell experiments. svn path=/branches/shell-experiments/; revision=61927
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
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* Dwarf address ranges parsing code.
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*/
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#include <precomp.h>
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#define NDEBUG
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#include <debug.h>
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int
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dwarfaddrtounit(Dwarf *d, ulong addr, ulong *unit)
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{
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DwarfBuf b;
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int segsize, i;
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ulong len, id, off, base, size;
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uchar *start, *end;
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memset(&b, 0, sizeof b);
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b.d = d;
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b.p = d->aranges.data;
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b.ep = b.p + d->aranges.len;
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while(b.p < b.ep){
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start = b.p;
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len = dwarfget4(&b);
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if (!len) { b.ep = b.p - 4; return -1; }
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if((id = dwarfget2(&b)) != 2){
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if(b.p == nil){
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underflow:
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werrstr("buffer underflow reading address ranges header");
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}else
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werrstr("bad dwarf version 0x%x in address ranges header", id);
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return -1;
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}
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off = dwarfget4(&b);
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b.addrsize = dwarfget1(&b);
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if(d->addrsize == 0)
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d->addrsize = b.addrsize;
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segsize = dwarfget1(&b);
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USED(segsize); /* what am i supposed to do with this? */
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if(b.p == nil)
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goto underflow;
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if((i = (b.p-start) % (2*b.addrsize)) != 0)
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b.p += 2*b.addrsize - i;
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end = start+4+len;
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while(b.p!=nil && b.p<end){
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base = dwarfgetaddr(&b);
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size = dwarfgetaddr(&b);
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if (!size) continue;
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if(b.p == nil)
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goto underflow;
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if(base <= addr && addr < base+size){
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*unit = off;
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return 0;
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}
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}
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if(b.p == nil)
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goto underflow;
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b.p = end;
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}
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werrstr("address 0x%lux is not listed in dwarf debugging symbols", addr);
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return -1;
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}
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