From 7ad59731c0e823466edd36ade5d59e18cc86120d Mon Sep 17 00:00:00 2001
From: Joel Dice <joel.dice@gmail.com>
Date: Mon, 28 Feb 2011 16:48:58 -0700
Subject: [PATCH] reserve register 2 for system use on Linux/PowerPC

The SYSV ABI specifies that it be reserved.  In practice, it is used
for thread-local storage.
---
 src/powerpc.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/powerpc.cpp b/src/powerpc.cpp
index 8a246e0aa1..e75fcc3791 100644
--- a/src/powerpc.cpp
+++ b/src/powerpc.cpp
@@ -2096,6 +2096,10 @@ class MyArchitecture: public Assembler::Architecture {
     case 0: // r0 has special meaning in addi and other instructions
     case StackRegister:
     case ThreadRegister:
+#ifndef __APPLE__
+      // r2 is reserved for system uses on SYSV
+    case 2:
+#endif
       return true;
 
     default: