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authorKeith Owens <kaos@sgi.com>2005-07-21 23:41:00 -0700
committerTony Luck <tony.luck@intel.com>2005-07-27 14:18:08 -0700
commitb833961bd30eec201b9a94eec36aa7ac96f9c9c0 (patch)
tree2ae8efad5995f7f23564304fd5027bea026ac65e /arch/ia64
parentd108919b2b5c064946c9bd30cbd4761d491cddb0 (diff)
[IA64] unwind.c uses wrong unat from switch_stack
unwind.c can read the wrong unat bits from switch_stack. sw->caller_unat is the value of ar.unat when the task was blocked. sw->ar_unat is the value of ar.unat after doing st8.spill for r4-7. IOW, ar_unat is caller_unat with 4 bits changed. unw_access_gr() uses sw->ar_unat for r4-7 (correct), but it also uses sw->ar_unat for other scratch registers (incorrect). sw->ar_unat should only be used for r4-7, everything else should use sw->caller_unat, unless modified by unwind info. Using sw->ar_unat risks picking up the 4 bits that were overwritten when r4-7 were saved. Also this line is wrong unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_UNAT); and should be unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_PFS); Signed-off-by: Keith Owens <kaos@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64')
-rw-r--r--arch/ia64/kernel/unwind.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c
index 2776a074c6f..3288be47bc7 100644
--- a/arch/ia64/kernel/unwind.c
+++ b/arch/ia64/kernel/unwind.c
@@ -362,7 +362,7 @@ unw_access_gr (struct unw_frame_info *info, int regnum, unsigned long *val, char
if (info->pri_unat_loc)
nat_addr = info->pri_unat_loc;
else
- nat_addr = &info->sw->ar_unat;
+ nat_addr = &info->sw->caller_unat;
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
}
} else {
@@ -524,7 +524,7 @@ unw_access_ar (struct unw_frame_info *info, int regnum, unsigned long *val, int
case UNW_AR_UNAT:
addr = info->unat_loc;
if (!addr)
- addr = &info->sw->ar_unat;
+ addr = &info->sw->caller_unat;
break;
case UNW_AR_LC:
@@ -1775,7 +1775,7 @@ run_script (struct unw_script *script, struct unw_frame_info *state)
case UNW_INSN_SETNAT_MEMSTK:
if (!state->pri_unat_loc)
- state->pri_unat_loc = &state->sw->ar_unat;
+ state->pri_unat_loc = &state->sw->caller_unat;
/* register off. is a multiple of 8, so the least 3 bits (type) are 0 */
s[dst+1] = ((unsigned long) state->pri_unat_loc - s[dst]) | UNW_NAT_MEMSTK;
break;
@@ -2243,11 +2243,11 @@ unw_init (void)
if (8*sizeof(unw_hash_index_t) < UNW_LOG_HASH_SIZE)
unw_hash_index_t_is_too_narrow();
- unw.sw_off[unw.preg_index[UNW_REG_PRI_UNAT_GR]] = SW(AR_UNAT);
+ unw.sw_off[unw.preg_index[UNW_REG_PRI_UNAT_GR]] = SW(CALLER_UNAT);
unw.sw_off[unw.preg_index[UNW_REG_BSPSTORE]] = SW(AR_BSPSTORE);
- unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_UNAT);
+ unw.sw_off[unw.preg_index[UNW_REG_PFS]] = SW(AR_PFS);
unw.sw_off[unw.preg_index[UNW_REG_RP]] = SW(B0);
- unw.sw_off[unw.preg_index[UNW_REG_UNAT]] = SW(AR_UNAT);
+ unw.sw_off[unw.preg_index[UNW_REG_UNAT]] = SW(CALLER_UNAT);
unw.sw_off[unw.preg_index[UNW_REG_PR]] = SW(PR);
unw.sw_off[unw.preg_index[UNW_REG_LC]] = SW(AR_LC);
unw.sw_off[unw.preg_index[UNW_REG_FPSR]] = SW(AR_FPSR);