diff options
| -rw-r--r-- | arch/ia64/kernel/unwind.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c index d494ff647ca..2776a074c6f 100644 --- a/arch/ia64/kernel/unwind.c +++ b/arch/ia64/kernel/unwind.c @@ -1943,23 +1943,30 @@ EXPORT_SYMBOL(unw_unwind); int unw_unwind_to_user (struct unw_frame_info *info) { - unsigned long ip, sp; + unsigned long ip, sp, pr = 0; while (unw_unwind(info) >= 0) { - if (unw_get_rp(info, &ip) < 0) { - unw_get_ip(info, &ip); - UNW_DPRINT(0, "unwind.%s: failed to read return pointer (ip=0x%lx)\n", - __FUNCTION__, ip); - return -1; - } unw_get_sp(info, &sp); - if (sp >= (unsigned long)info->task + IA64_STK_OFFSET) + if ((long)((unsigned long)info->task + IA64_STK_OFFSET - sp) + < IA64_PT_REGS_SIZE) { + UNW_DPRINT(0, "unwind.%s: ran off the top of the kernel stack\n", + __FUNCTION__); break; - if (ip < FIXADDR_USER_END) + } + if (unw_is_intr_frame(info) && + (pr & (1UL << PRED_USER_STACK))) return 0; + if (unw_get_pr (info, &pr) < 0) { + unw_get_rp(info, &ip); + UNW_DPRINT(0, "unwind.%s: failed to read " + "predicate register (ip=0x%lx)\n", + __FUNCTION__, ip); + return -1; + } } unw_get_ip(info, &ip); - UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n", __FUNCTION__, ip); + UNW_DPRINT(0, "unwind.%s: failed to unwind to user-level (ip=0x%lx)\n", + __FUNCTION__, ip); return -1; } EXPORT_SYMBOL(unw_unwind_to_user); |