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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_accessors_t *a = unw_get_accessors (as);
unw_word_t dyn_list_addr, addr, next_addr, gen1, gen2; unw_word_t dyn_list_addr, addr, next_addr, gen1, gen2;
unw_word_t start_ip, end_ip;
unw_dyn_info_t di; unw_dyn_info_t di;
int32_t pad;
int ret; int ret;
ret = (*a->get_dyn_info_list_addr) (as, &dyn_list_addr, arg); if ((*a->get_dyn_info_list_addr) (as, &dyn_list_addr, arg) < 0)
if (ret < 0) return -UNW_ENOINFO;
return ret;
do do
{ {
addr = dyn_list_addr; addr = dyn_list_addr;
if ((ret = fetchw (as, a, &addr, &gen1, arg)) < 0 ret = -UNW_ENOINFO;
|| (ret = fetchw (as, a, &addr, &next_addr, arg)) < 0)
if (fetchw (as, a, &addr, &gen1, arg) < 0
|| fetchw (as, a, &addr, &next_addr, arg) < 0)
return ret; return ret;
for (addr = next_addr; addr != 0; addr = next_addr) for (addr = next_addr; addr != 0; addr = next_addr)
{ {
if ((ret = fetchw (as, a, &addr, &next_addr, arg)) < 0 if (fetchw (as, a, &addr, &next_addr, arg) < 0)
|| (ret = fetchw (as, a, &addr, &start_ip, arg)) < 0 goto recheck; /* only fail if generation # didn't change */
|| (ret = fetchw (as, a, &addr, &end_ip, arg)) < 0)
return ret; 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 (ip >= di.start_ip && ip < di.end_ip)
{ {
if ((ret = fetchw (as, a, &addr, &di.gp, arg)) < 0 if (fetchw (as, a, &addr, &di.gp, arg) < 0
|| (ret = fetch32 (as, a, &addr, &di.format, arg)) < 0 || fetch32 (as, a, &addr, &di.format, arg) < 0)
|| (ret = fetch32 (as, a, &addr, &pad, arg)) < 0) goto recheck; /* only fail if generation # didn't change */
return ret;
if (need_unwind_info) addr += 4; /* skip over padding */
if ((ret = intern_dyn_info (as, a, &addr, &di, arg)) < 0)
return ret;
ret = unwi_extract_dynamic_proc_info (as, ip, pi, &di, if (need_unwind_info
need_unwind_info, arg); && intern_dyn_info (as, a, &addr, &di, arg) < 0)
if (ret < 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); 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 /* Re-check generation number to ensure the data we have is
underneath us: */ consistent. */
recheck:
addr = dyn_list_addr; addr = dyn_list_addr;
if ((ret = fetchw (as, a, &addr, &gen2, arg)) < 0) if (fetchw (as, a, &addr, &gen2, arg) < 0)
return ret; return ret;
} }
while (gen1 != gen2); while (gen1 != gen2);
*genp = gen1; *genp = gen1;
return 0; return ret;
} }
HIDDEN void HIDDEN void