From: Gabe Black <gblack@eecs.umich.edu>
Date: Sun, 15 Nov 2009 08:23:14 +0000 (-0800)
Subject: ARM: Make the exception return form of ldm restore CPSR.
X-Git-Tag: stable_2012_02_02~1575^2~64
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9127ee5ac8913eacfc62967bd4b275a1845d8a9b;p=gem5.git

ARM: Make the exception return form of ldm restore CPSR.
---

diff --git a/src/arch/arm/isa/formats/macromem.isa b/src/arch/arm/isa/formats/macromem.isa
index ad27b5a56..068b48199 100644
--- a/src/arch/arm/isa/formats/macromem.isa
+++ b/src/arch/arm/isa/formats/macromem.isa
@@ -210,6 +210,7 @@ inline %(class_name)s::%(class_name)s(ExtMachInst machInst)
     microOps[0] = new MicroAddiUop(machInst, INTREG_UREG0, RN, 0);
 
     unsigned reg = 0;
+    bool forceUser = machInst.puswl.psruser;
     for (int i = 1; i < ones + 1; i++) {
         // Find the next register.
         while (!bits(regs, reg))
@@ -217,13 +218,19 @@ inline %(class_name)s::%(class_name)s(ExtMachInst machInst)
         replaceBits(regs, reg, 0);
 
         unsigned regIdx = reg;
-        if (machInst.puswl.psruser) {
+        if (forceUser) {
             regIdx = intRegForceUser(regIdx);
         }
 
         if (machInst.puswl.loadOp) {
-            microOps[i] =
-                new MicroLdrUop(machInst, regIdx, INTREG_UREG0, addr);
+            if (reg == INTREG_PC && forceUser) {
+                // This must be the exception return form of ldm.
+                microOps[i] =
+                    new MicroLdrRetUop(machInst, regIdx, INTREG_UREG0, addr);
+            } else {
+                microOps[i] =
+                    new MicroLdrUop(machInst, regIdx, INTREG_UREG0, addr);
+            }
         } else {
             microOps[i] =
                 new MicroStrUop(machInst, regIdx, INTREG_UREG0, addr);