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| author | Keith Owens <kaos@sgi.com> | 2005-07-21 23:41:00 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-07-27 14:18:08 -0700 |
| commit | b833961bd30eec201b9a94eec36aa7ac96f9c9c0 (patch) | |
| tree | 2ae8efad5995f7f23564304fd5027bea026ac65e /arch/ia64/kernel | |
| parent | d108919b2b5c064946c9bd30cbd4761d491cddb0 (diff) | |
| download | op-kernel-dev-b833961bd30eec201b9a94eec36aa7ac96f9c9c0.zip op-kernel-dev-b833961bd30eec201b9a94eec36aa7ac96f9c9c0.tar.gz | |
[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/kernel')
| -rw-r--r-- | arch/ia64/kernel/unwind.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c index 2776a07..3288be4 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); |
