From 2fbf4cece7771b8f85c1b400cb4298cbc34b6c1d Mon Sep 17 00:00:00 2001
From: "hp.com!davidm" <hp.com!davidm>
Date: Wed, 26 Feb 2003 08:33:57 +0000
Subject: [PATCH] (_UPT_access_reg): Allow reading of r0 (UNW_IA64_GR+0) to
 support ".save rp, r0" 	idiom.

(Logical change 1.55)
---
 src/_UPT_access_reg.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/_UPT_access_reg.c b/src/_UPT_access_reg.c
index d15ec672..b656f8b2 100644
--- a/src/_UPT_access_reg.c
+++ b/src/_UPT_access_reg.c
@@ -71,6 +71,12 @@ _UPT_access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val,
   else
     switch (reg)
       {
+      case UNW_IA64_GR + 0:
+	if (write)
+	  return -UNW_EBADREG;
+	*val = 0;
+	return 0;
+
       case UNW_REG_IP:
 	{
 	  unsigned long ip, psr;