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/*
* Dwarf address ranges parsing code.
*/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include "elf.h"
#include "dwarf.h"
int
dwarfaddrtounit(Dwarf *d, ulong addr, ulong *unit)
{
DwarfBuf b;
int segsize, i;
ulong len, id, off, base, size;
uchar *start, *end;
memset(&b, 0, sizeof b);
b.d = d;
b.p = d->aranges.data;
b.ep = b.p + d->aranges.len;
while(b.p < b.ep){
start = b.p;
len = dwarfget4(&b);
if((id = dwarfget2(&b)) != 2){
if(b.p == nil){
underflow:
werrstr("buffer underflow reading address ranges header");
}else
werrstr("bad dwarf version 0x%lux in address ranges header", id);
return -1;
}
off = dwarfget4(&b);
b.addrsize = dwarfget1(&b);
if(d->addrsize == 0)
d->addrsize = b.addrsize;
segsize = dwarfget1(&b);
USED(segsize); /* what am i supposed to do with this? */
if(b.p == nil)
goto underflow;
if((i = (b.p-start) % (2*b.addrsize)) != 0)
b.p += 2*b.addrsize - i;
end = start+4+len;
while(b.p!=nil && b.p<end){
base = dwarfgetaddr(&b);
size = dwarfgetaddr(&b);
if(b.p == nil)
goto underflow;
if(base <= addr && addr < base+size){
*unit = off;
return 0;
}
}
if(b.p == nil)
goto underflow;
b.p = end;
}
werrstr("address 0x%lux is not listed in dwarf debugging symbols", addr);
return -1;
}
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