[PATCH v3 16/21] target/ppc: Remove msr_ep macro

[Víctor Colombo]

msr_ep macro hides the usage of env->msr, which is a bad behavior
Substitute it with FIELD_EX64 calls that explicitly use env->msr
as a parameter.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>

---

v3: Fix the difference check to use a xor
    fix incorrect "FIELD_EX64(env->msr, ..." -> "FIELD_EX64(value, ..."
Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
---
 target/ppc/cpu.h         | 2 +-
 target/ppc/helper_regs.c | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index ff52eef304..9683e6a359 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -363,6 +363,7 @@ FIELD(MSR, EE, MSR_EE, 1)
 FIELD(MSR, PR, MSR_PR, 1)
 FIELD(MSR, FP, MSR_FP, 1)
 FIELD(MSR, ME, MSR_ME, 1)
+FIELD(MSR, EP, MSR_EP, 1)
 FIELD(MSR, IR, MSR_IR, 1)
 FIELD(MSR, DR, MSR_DR, 1)
 FIELD(MSR, DS, MSR_DS, 1)
@@ -485,7 +486,6 @@ FIELD(MSR, LE, MSR_LE, 1)
 #endif
 #define msr_fe0  ((env->msr >> MSR_FE0)  & 1)
 #define msr_fe1  ((env->msr >> MSR_FE1)  & 1)
-#define msr_ep   ((env->msr >> MSR_EP)   & 1)
 #define msr_ts   ((env->msr >> MSR_TS1)  & 3)
 
 #define DBCR0_ICMP (1 << 27)
diff --git a/target/ppc/helper_regs.c b/target/ppc/helper_regs.c
index 555ea73dc1..27f0c0968c 100644
--- a/target/ppc/helper_regs.c
+++ b/target/ppc/helper_regs.c
@@ -240,8 +240,8 @@ int hreg_store_msr(CPUPPCState *env, target_ulong value, 
int alter_hv)
         /* Swap temporary saved registers with GPRs */
         hreg_swap_gpr_tgpr(env);
     }
-    if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
-        env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
+    if (unlikely((value ^ env->msr) & R_MSR_EP_MASK)) {
+        env->excp_prefix = FIELD_EX64(value, MSR, EP) * 0xFFF00000;
     }
     /*
      * If PR=1 then EE, IR and DR must be 1
-- 
2.25.1