Re: [Libunwind-devel] arm: issue of reading SP register

[MyungJoo Ham]

From 43aeb2fe60ad3c93a2d550ecdc8490ab286319be Mon Sep 17 00:00:00 2001
From: MyungJoo Ham <address@hidden>
Date: Thu, 25 Feb 2016 10:24:12 +0900
Subject: [PATCH] arm: fix reading SP register read

Partially reverting 0f9937485 while keeping
the part that disallowing writing to SP.

Signed-off-by: MyungJoo Ham <address@hidden>
---
 src/arm/Gregs.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/arm/Gregs.c b/src/arm/Gregs.c
index 688771f..0cc5552 100644
--- a/src/arm/Gregs.c
+++ b/src/arm/Gregs.c
@@ -51,6 +51,10 @@ tdep_access_reg (struct cursor *c, unw_regnum_t reg, 
unw_word_t *valp,
       break;
 
     case UNW_ARM_R13:
+      if (write)
+        return -UNW_EREADONLYREG;
+      loc = c->dwarf.loc[reg - UNW_ARM_R0];
+      break;
     case UNW_ARM_CFA:
       if (write)
         return -UNW_EREADONLYREG;
-- 
1.9.1