[Qemu-devel] [PATCH 31/48] mmu-hash32: Remove odd pointer usage from BAT code

[David Gibson <david@gibson.dropbear.id.au>]

In the code for handling BATs, the hash32_bat_size_prot() and
hash32_bat_601_size_prot() functions are passed the BAT contents by
reference (pointer) for no clear reason, since they only need the values
within.

This patch removes this odd usage, and uses the resulting change to clean
up the caller slightly.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 target-ppc/mmu-hash32.c |   47 ++++++++++++++++++++++++-----------------------
 1 file changed, 24 insertions(+), 23 deletions(-)

diff --git a/target-ppc/mmu-hash32.c b/target-ppc/mmu-hash32.c
index 53e86de..b7f6e8f 100644
--- a/target-ppc/mmu-hash32.c
+++ b/target-ppc/mmu-hash32.c
@@ -115,19 +115,19 @@ static int ppc_hash32_check_prot(int prot, int rwx)
 
 /* Perform BAT hit & translation */
 static void hash32_bat_size_prot(CPUPPCState *env, target_ulong *blp,
-                                 int *validp, int *protp, target_ulong *BATu,
-                                 target_ulong *BATl)
+                                 int *validp, int *protp,
+                                 target_ulong batu, target_ulong batl)
 {
     target_ulong bl;
     int pp, valid, prot;
 
-    bl = (*BATu & BATU32_BL) << 15;
+    bl = (batu & BATU32_BL) << 15;
     valid = 0;
     prot = 0;
-    if (((msr_pr == 0) && (*BATu & BATU32_VS)) ||
-        ((msr_pr != 0) && (*BATu & BATU32_VP))) {
+    if (((msr_pr == 0) && (batu & BATU32_VS)) ||
+        ((msr_pr != 0) && (batu & BATU32_VP))) {
         valid = 1;
-        pp = *BATl & BATL32_PP;
+        pp = batl & BATL32_PP;
         if (pp != 0) {
             prot = PAGE_READ | PAGE_EXEC;
             if (pp == 0x2) {
@@ -142,22 +142,22 @@ static void hash32_bat_size_prot(CPUPPCState *env, target_ulong *blp,
 
 static void hash32_bat_601_size_prot(CPUPPCState *env, target_ulong *blp,
                                      int *validp, int *protp,
-                                     target_ulong *BATu, target_ulong *BATl)
+                                     target_ulong batu, target_ulong batl)
 {
     target_ulong bl;
     int key, pp, valid, prot;
 
-    bl = (*BATl & BATL32_601_BL) << 17;
+    bl = (batl & BATL32_601_BL) << 17;
     LOG_BATS("b %02x ==> bl " TARGET_FMT_lx " msk " TARGET_FMT_lx "\n",
-             (uint8_t)(*BATl & BATL32_601_BL), bl, ~bl);
+             (uint8_t)(batl & BATL32_601_BL), bl, ~bl);
     prot = 0;
-    valid = !!(*BATl & BATL32_601_V);
+    valid = !!(batl & BATL32_601_V);
     if (valid) {
-        pp = *BATu & BATU32_601_PP;
+        pp = batu & BATU32_601_PP;
         if (msr_pr == 0) {
-            key = !!(*BATu & BATU32_601_KS);
+            key = !!(batu & BATU32_601_KS);
         } else {
-            key = !!(*BATu & BATU32_601_KP);
+            key = !!(batu & BATU32_601_KP);
         }
         prot = ppc_hash32_pp_check(key, pp, 0);
     }
@@ -169,7 +169,7 @@ static void hash32_bat_601_size_prot(CPUPPCState *env, target_ulong *blp,
 static int ppc_hash32_get_bat(CPUPPCState *env, struct mmu_ctx_hash32 *ctx,
                               target_ulong virtual, int rwx)
 {
-    target_ulong *BATlt, *BATut, *BATu, *BATl;
+    target_ulong *BATlt, *BATut;
     target_ulong BEPIl, BEPIu, bl;
     int i, valid, prot;
     int ret = -1;
@@ -184,25 +184,26 @@ static int ppc_hash32_get_bat(CPUPPCState *env, struct mmu_ctx_hash32 *ctx,
         BATut = env->DBAT[0];
     }
     for (i = 0; i < env->nb_BATs; i++) {
-        BATu = &BATut[i];
-        BATl = &BATlt[i];
-        BEPIu = *BATu & BATU32_BEPIU;
-        BEPIl = *BATu & BATU32_BEPIL;
+        target_ulong batu = BATut[i];
+        target_ulong batl = BATlt[i];
+
+        BEPIu = batu & BATU32_BEPIU;
+        BEPIl = batu & BATU32_BEPIL;
         if (unlikely(env->mmu_model == POWERPC_MMU_601)) {
-            hash32_bat_601_size_prot(env, &bl, &valid, &prot, BATu, BATl);
+            hash32_bat_601_size_prot(env, &bl, &valid, &prot, batu, batl);
         } else {
-            hash32_bat_size_prot(env, &bl, &valid, &prot, BATu, BATl);
+            hash32_bat_size_prot(env, &bl, &valid, &prot, batu, batl);
         }
         LOG_BATS("%s: %cBAT%d v " TARGET_FMT_lx " BATu " TARGET_FMT_lx
                  " BATl " TARGET_FMT_lx "\n", __func__,
-                 type == ACCESS_CODE ? 'I' : 'D', i, virtual, *BATu, *BATl);
+                 type == ACCESS_CODE ? 'I' : 'D', i, virtual, batu, batl);
         if ((virtual & BATU32_BEPIU) == BEPIu &&
             ((virtual & BATU32_BEPIL) & ~bl) == BEPIl) {
             /* BAT matches */
             if (valid != 0) {
                 /* Get physical address */
-                ctx->raddr = (*BATl & BATL32_BRPNU) |
-                    ((virtual & BATU32_BEPIL & bl) | (*BATl & BATL32_BRPNL)) |
+                ctx->raddr = (batl & BATL32_BRPNU) |
+                    ((virtual & BATU32_BEPIL & bl) | (batl & BATL32_BRPNL)) |
                     (virtual & 0x0001F000);
                 /* Compute access rights */
                 ctx->prot = prot;
-- 
1.7.10.4