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(unwi_dyn_remote_find_proc_info): If anything goes wrong, return -UNW_ENOINFO.

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Skip over "prev_addr".  Read start/end-IP directly into the "di" structure,
	not into temporary variables.  Skip padding by directly adjusting the
	address (don't bother fetching padding values; that only slows things down).
	Return 0 only if we really did find dynamic unwind info.

(Logical change 1.55)
This commit is contained in:
hp.com!davidm 2003-02-26 08:33:57 +00:00
parent 95a55361c8
commit 1fc6f4e6b3
1 changed files with 32 additions and 27 deletions
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59
src/dyn-remote.c
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@ -190,61 +190,66 @@ unwi_dyn_remote_find_proc_info (unw_addr_space_t as, unw_word_t ip,
{
unw_accessors_t *a = unw_get_accessors (as);
unw_word_t dyn_list_addr, addr, next_addr, gen1, gen2;
unw_word_t start_ip, end_ip;
unw_dyn_info_t di;
int32_t pad;
int ret;
ret = (*a->get_dyn_info_list_addr) (as, &dyn_list_addr, arg);
if (ret < 0)
return ret;
if ((*a->get_dyn_info_list_addr) (as, &dyn_list_addr, arg) < 0)
return -UNW_ENOINFO;
do
{
addr = dyn_list_addr;
if ((ret = fetchw (as, a, &addr, &gen1, arg)) < 0
|| (ret = fetchw (as, a, &addr, &next_addr, arg)) < 0)
ret = -UNW_ENOINFO;
if (fetchw (as, a, &addr, &gen1, arg) < 0
|| fetchw (as, a, &addr, &next_addr, arg) < 0)
return ret;
for (addr = next_addr; addr != 0; addr = next_addr)
{
if ((ret = fetchw (as, a, &addr, &next_addr, arg)) < 0
|| (ret = fetchw (as, a, &addr, &start_ip, arg)) < 0
|| (ret = fetchw (as, a, &addr, &end_ip, arg)) < 0)
return ret;
if (fetchw (as, a, &addr, &next_addr, arg) < 0)
goto recheck; /* only fail if generation # didn't change */
addr += WSIZE; /* skip over prev_addr */
if (fetchw (as, a, &addr, &di.start_ip, arg) < 0
|| fetchw (as, a, &addr, &di.end_ip, arg) < 0)
goto recheck; /* only fail if generation # didn't change */
if (ip >= di.start_ip && ip < di.end_ip)
{
if ((ret = fetchw (as, a, &addr, &di.gp, arg)) < 0
|| (ret = fetch32 (as, a, &addr, &di.format, arg)) < 0
|| (ret = fetch32 (as, a, &addr, &pad, arg)) < 0)
return ret;
if (fetchw (as, a, &addr, &di.gp, arg) < 0
|| fetch32 (as, a, &addr, &di.format, arg) < 0)
goto recheck; /* only fail if generation # didn't change */
if (need_unwind_info)
if ((ret = intern_dyn_info (as, a, &addr, &di, arg)) < 0)
return ret;
addr += 4; /* skip over padding */
ret = unwi_extract_dynamic_proc_info (as, ip, pi, &di,
need_unwind_info, arg);
if (ret < 0)
if (need_unwind_info
&& intern_dyn_info (as, a, &addr, &di, arg) < 0)
goto recheck; /* only fail if generation # didn't change */
if (unwi_extract_dynamic_proc_info (as, ip, pi, &di,
need_unwind_info, arg) < 0)
{
free_dyn_info (&di);
return ret;
goto recheck; /* only fail if generation # didn't change */
}
return 0;
ret = 0; /* OK, found it */
break;
}
}
/* Recheck generation number to ensure things didn't change
underneath us: */
/* Re-check generation number to ensure the data we have is
consistent. */
recheck:
addr = dyn_list_addr;
if ((ret = fetchw (as, a, &addr, &gen2, arg)) < 0)
if (fetchw (as, a, &addr, &gen2, arg) < 0)
return ret;
}
while (gen1 != gen2);
*genp = gen1;
return 0;
return ret;
}
HIDDEN void