From 9a9dcce8e8f235bddcbb89bf6010577686b4627b Mon Sep 17 00:00:00 2001
From: Eric Botcazou <ebotcazou@adacore.com>
Date: Sat, 31 Mar 2012 16:24:04 +0000
Subject: [PATCH] unwind-ia64.c (uw_install_context): Manually save LC if it
hasn't been previously saved.
* config/ia64/unwind-ia64.c (uw_install_context): Manually save LC
if it hasn't been previously saved.
From-SVN: r186045
---
libgcc/ChangeLog | 5 +++++
libgcc/config/ia64/unwind-ia64.c | 12 ++++++++++++
2 files changed, 17 insertions(+)
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index f44f52ea1bac..0adcc5ac1dba 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-03-31 Eric Botcazou <ebotcazou@adacore.com>
+
+ * config/ia64/unwind-ia64.c (uw_install_context): Manually save LC
+ if it hasn't been previously saved.
+
2012-03-29 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/linux-unwind.h (x86_64_fallback_frame_state): Define
diff --git a/libgcc/config/ia64/unwind-ia64.c b/libgcc/config/ia64/unwind-ia64.c
index 10cf1363b1bd..2bb9100a4995 100644
--- a/libgcc/config/ia64/unwind-ia64.c
+++ b/libgcc/config/ia64/unwind-ia64.c
@@ -2169,8 +2169,20 @@ uw_install_context (struct _Unwind_Context *current __attribute__((unused)),
struct _Unwind_Context *target)
{
unw_word ireg_buf[4], ireg_nat = 0, ireg_pr = 0;
+ unw_word saved_lc;
int i;
+ /* ??? LC is a fixed register so the call to __builtin_unwind_init in
+ uw_init_context doesn't cause it to be saved. In case it isn't in
+ the user frames either, we need to manually do so here, lest it be
+ clobbered by the loop just below. */
+ if (target->lc_loc == NULL)
+ {
+ register unw_word lc asm ("ar.lc");
+ saved_lc = lc;
+ target->lc_loc = &saved_lc;
+ }
+
/* Copy integer register data from the target context to a
temporary buffer. Do this so that we can frob AR.UNAT
to get the NaT bits for these registers set properly. */
--
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