[Qemu-ppc] [PATCH 5/8] PPC: Add support for MSR_CM

[Alexander Graf]

The BookE variant of MSR_SF is MSR_CM. Implement everything it takes in TCG to
support running 64bit code with MSR_CM set.

Signed-off-by: Alexander Graf <address@hidden>
---
 target-ppc/cpu.h         |    9 +++++++++
 target-ppc/excp_helper.c |    9 +++++----
 target-ppc/mem_helper.c  |    2 +-
 target-ppc/translate.c   |    2 +-
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 12200ab..7a77fff 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -2212,6 +2212,15 @@ static inline uint32_t booke206_tlbnps(CPUPPCState *env, 
const int tlbn)
 
 #endif
 
+static inline bool msr_is_64bit(CPUPPCState *env, target_ulong msr)
+{
+    if (env->mmu_model == POWERPC_MMU_BOOKE206) {
+        return msr & (1ULL << MSR_CM);
+    }
+
+    return msr & (1ULL << MSR_SF);
+}
+
 extern void (*cpu_ppc_hypercall)(CPUPPCState *);
 
 static inline bool cpu_has_work(CPUPPCState *env)
diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c
index c7762b9..1a593f6 100644
--- a/target-ppc/excp_helper.c
+++ b/target-ppc/excp_helper.c
@@ -608,10 +608,11 @@ static inline void powerpc_excp(CPUPPCState *env, int 
excp_model, int excp)
     vector |= env->excp_prefix;
 #if defined(TARGET_PPC64)
     if (excp_model == POWERPC_EXCP_BOOKE) {
-        if (!msr_icm) {
-            vector = (uint32_t)vector;
-        } else {
+        if (env->spr[SPR_BOOKE_EPCR] & EPCR_ICM) {
+            /* Cat.64-bit: EPCR.ICM is copied to MSR.CM */
             new_msr |= (target_ulong)1 << MSR_CM;
+        } else {
+            vector = (uint32_t)vector;
         }
     } else {
         if (!msr_isf && !(env->mmu_model & POWERPC_MMU_64)) {
@@ -803,7 +804,7 @@ static inline void do_rfi(CPUPPCState *env, target_ulong 
nip, target_ulong msr,
                           target_ulong msrm, int keep_msrh)
 {
 #if defined(TARGET_PPC64)
-    if (msr & (1ULL << MSR_SF)) {
+    if (msr_is_64bit(env, msr)) {
         nip = (uint64_t)nip;
         msr &= (uint64_t)msrm;
     } else {
diff --git a/target-ppc/mem_helper.c b/target-ppc/mem_helper.c
index ebcd7b2..5b5f1bd 100644
--- a/target-ppc/mem_helper.c
+++ b/target-ppc/mem_helper.c
@@ -35,7 +35,7 @@ static inline target_ulong addr_add(CPUPPCState *env, 
target_ulong addr,
                                     target_long arg)
 {
 #if defined(TARGET_PPC64)
-    if (!msr_sf) {
+    if (!msr_is_64bit(env, env->msr)) {
         return (uint32_t)(addr + arg);
     } else
 #endif
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 9103fd5..73ee74b 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -9626,7 +9626,7 @@ static inline void 
gen_intermediate_code_internal(CPUPPCState *env,
     ctx.access_type = -1;
     ctx.le_mode = env->hflags & (1 << MSR_LE) ? 1 : 0;
 #if defined(TARGET_PPC64)
-    ctx.sf_mode = msr_sf;
+    ctx.sf_mode = msr_is_64bit(env, env->msr);
     ctx.has_cfar = !!(env->flags & POWERPC_FLAG_CFAR);
 #endif
     ctx.fpu_enabled = msr_fp;
-- 
1.6.0.2