[PULL 18/26] target/ppc: powerpc_excp: Set alternate SRRs directly

["Cédric Le Goater" <clg@kaod.org>]

From: Fabiano Rosas <farosas@linux.ibm.com>

There are currently only two interrupts that use alternate SRRs, so
let them write to them directly during the setup code.

No functional change intended.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20211229165751.3774248-2-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/excp_helper.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index e3380722c5c4..c7efbdc3051b 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -370,7 +370,7 @@ static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
     CPUState *cs = CPU(cpu);
     CPUPPCState *env = &cpu->env;
     target_ulong msr, new_msr, vector;
-    int srr0, srr1, asrr0, asrr1, lev = -1;
+    int srr0, srr1, lev = -1;
 
     qemu_log_mask(CPU_LOG_INT, "Raise exception at " TARGET_FMT_lx
                   " => %s (%d) error=%02x\n", env->nip, powerpc_excp_name(excp),
@@ -392,8 +392,6 @@ static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
     /* target registers */
     srr0 = SPR_SRR0;
     srr1 = SPR_SRR1;
-    asrr0 = -1;
-    asrr1 = -1;
 
     /*
      * check for special resume at 0x100 from doze/nap/sleep/winkle on
@@ -483,8 +481,9 @@ static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
             /* FIXME: choose one or the other based on CPU type */
             srr0 = SPR_BOOKE_MCSRR0;
             srr1 = SPR_BOOKE_MCSRR1;
-            asrr0 = SPR_BOOKE_CSRR0;
-            asrr1 = SPR_BOOKE_CSRR1;
+
+            env->spr[SPR_BOOKE_CSRR0] = env->nip;
+            env->spr[SPR_BOOKE_CSRR1] = msr;
             break;
         default:
             break;
@@ -643,8 +642,10 @@ static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
             /* FIXME: choose one or the other based on CPU type */
             srr0 = SPR_BOOKE_DSRR0;
             srr1 = SPR_BOOKE_DSRR1;
-            asrr0 = SPR_BOOKE_CSRR0;
-            asrr1 = SPR_BOOKE_CSRR1;
+
+            env->spr[SPR_BOOKE_CSRR0] = env->nip;
+            env->spr[SPR_BOOKE_CSRR1] = msr;
+
             /* DBSR already modified by caller */
         } else {
             cpu_abort(cs, "Debug exception triggered on unsupported model\n");
@@ -911,14 +912,6 @@ static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
 
     vector |= env->excp_prefix;
 
-    /* If any alternate SRR register are defined, duplicate saved values */
-    if (asrr0 != -1) {
-        env->spr[asrr0] = env->nip;
-    }
-    if (asrr1 != -1) {
-        env->spr[asrr1] = msr;
-    }
-
 #if defined(TARGET_PPC64)
     if (excp_model == POWERPC_EXCP_BOOKE) {
         if (env->spr[SPR_BOOKE_EPCR] & EPCR_ICM) {
-- 
2.31.1