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Inline access to initial register values as it's known to be safe.

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Lassi Tuura 2011-05-06 20:19:36 -07:00 committed by Arun Sharma
parent 36511d3d1f
commit 5c2cade264
1 changed files with 4 additions and 8 deletions
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12
src/x86_64/Gtrace.c
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@ -412,16 +412,12 @@ tdep_trace (unw_cursor_t *cursor, void **buffer, int *size)
/* Tell core dwarf routines to call back to us. */
d->stash_frames = 1;
/* Determine initial register values. */
/* Determine initial register values. These are direct access safe
because we know they come from the initial machine context. */
rip = d->ip;
rsp = cfa = d->cfa;
if (unlikely((ret = dwarf_get (d, d->loc[UNW_X86_64_RBP], &rbp)) < 0))
{
Debug (1, "returning %d, rbp value not found\n", ret);
*size = 0;
d->stash_frames = 0;
return ret;
}
ACCESS_MEM_FAST(ret, 0, d, DWARF_GET_LOC(d->loc[UNW_X86_64_RBP]), rbp);
assert(ret == 0);
/* Get frame cache. */
if (unlikely(! (cache = trace_cache_get())))