From: Peter Maydell <peter.maydell@linaro.org>
Date: Fri, 19 Nov 2010 15:36:47 +0000 (+0000)
Subject: ARM: enable XScale/iWMMXT in linux-user mode
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3a807decfa5245d3eb50c9301e73fc5da4a484e1;p=qemu.git

ARM: enable XScale/iWMMXT in linux-user mode

In linux-user mode, the XScale/iWMMXT coprocessors must be enabled
at reset so that we can run code that uses these instructions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 996d40d185..94aef393e2 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -203,7 +203,13 @@ void cpu_reset(CPUARMState *env)
         cpu_reset_model_id(env, id);
 #if defined (CONFIG_USER_ONLY)
     env->uncached_cpsr = ARM_CPU_MODE_USR;
+    /* For user mode we must enable access to coprocessors */
     env->vfp.xregs[ARM_VFP_FPEXC] = 1 << 30;
+    if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
+        env->cp15.c15_cpar = 3;
+    } else if (arm_feature(env, ARM_FEATURE_XSCALE)) {
+        env->cp15.c15_cpar = 1;
+    }
 #else
     /* SVC mode with interrupts disabled.  */
     env->uncached_cpsr = ARM_CPU_MODE_SVC | CPSR_A | CPSR_F | CPSR_I;