target/ppc: Introduce ppc_env_is_little_endian() helper

Centralize endianness check on MSR via a common helper.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20260202210106.93257-10-philmd@linaro.org>

target/ppc/cpu_init.c

@@ -7364,7 +7364,7 @@ static bool ppc_cpu_is_big_endian(CPUState *cs)
 {
     cpu_synchronize_state(cs);
 
-    return !FIELD_EX64(cpu_env(cs)->msr, MSR, LE);
+    return !ppc_env_is_little_endian(cpu_env(cs));
 }
 
 static bool ppc_get_irq_stats(InterruptStatsProvider *obj,
@@ -7456,11 +7456,8 @@ static void ppc_disas_set_info(CPUState *cs, disassemble_info *info)
 {
     CPUPPCState *env = cpu_env(cs);
 
-    if ((env->msr >> MSR_LE) & 1) {
-        info->endian = BFD_ENDIAN_LITTLE;
-    } else {
-        info->endian = BFD_ENDIAN_BIG;
-    }
+    info->endian = ppc_env_is_little_endian(env) ? BFD_ENDIAN_LITTLE
+                                                 : BFD_ENDIAN_BIG;
     info->mach = env->bfd_mach;
     if (!env->bfd_mach) {
 #ifdef TARGET_PPC64

target/ppc/gdbstub.c

@@ -84,7 +84,7 @@ static int ppc_gdb_register_len(int n)
 void ppc_maybe_bswap_register(CPUPPCState *env, uint8_t *mem_buf, int len)
 {
 #ifndef CONFIG_USER_ONLY
-    if (!FIELD_EX64(env->msr, MSR, LE)) {
+    if (!ppc_env_is_little_endian(env)) {
         /* do nothing */
     } else if (len == 4) {
         bswap32s((uint32_t *)mem_buf);

target/ppc/internal.h

@@ -24,6 +24,11 @@
 #include "exec/page-protection.h"
 #include "accel/tcg/tb-cpu-state.h"
 
+static inline bool ppc_env_is_little_endian(const CPUPPCState *env)
+{
+    return FIELD_EX64(env->msr, MSR, LE);
+}
+
 /**
  * ppc_data_endian_env:
  * @env: the cpu context

target/ppc/mem_helper.c

@@ -420,7 +420,7 @@ target_ulong helper_lscbx(CPUPPCState *env, target_ulong addr, uint32_t reg,
         int adjust = HI_IDX * (n_elems - 1);                    \
         int sh = sizeof(r->element[0]) >> 1;                    \
         int index = (addr & 0xf) >> sh;                         \
-        bool byteswap = FIELD_EX64(env->msr, MSR, LE);          \
+        bool byteswap = ppc_env_is_little_endian(env);          \
                                                                 \
         if (byteswap) {                                         \
             index = n_elems - index - 1;                        \
@@ -446,7 +446,7 @@ LVE(LVEWX, cpu_ldl_be_data_ra, bswap32, u32)
         int adjust = HI_IDX * (n_elems - 1);                            \
         int sh = sizeof(r->element[0]) >> 1;                            \
         int index = (addr & 0xf) >> sh;                                 \
-        bool byteswap = FIELD_EX64(env->msr, MSR, LE);                  \
+        bool byteswap = ppc_env_is_little_endian(env);                  \
                                                                         \
         if (byteswap) {                                                 \
             index = n_elems - index - 1;                                \
@@ -479,7 +479,7 @@ void helper_##name(CPUPPCState *env, target_ulong addr,                 \
     t.s128 = int128_zero();                                             \
     if (nb) {                                                           \
         nb = (nb >= 16) ? 16 : nb;                                      \
-        if (FIELD_EX64(env->msr, MSR, LE) && !lj) {                     \
+        if (ppc_env_is_little_endian(env) && !lj) {                     \
             for (i = 16; i > 16 - nb; i--) {                            \
                 t.VsrB(i - 1) = cpu_ldub_data_ra(env, addr, GETPC());   \
                 addr = addr_add(env, addr, 1);                          \
@@ -510,7 +510,7 @@ void helper_##name(CPUPPCState *env, target_ulong addr,           \
     }                                                             \
                                                                   \
     nb = (nb >= 16) ? 16 : nb;                                    \
-    if (FIELD_EX64(env->msr, MSR, LE) && !lj) {                   \
+    if (ppc_env_is_little_endian(env) && !lj) {                   \
         for (i = 16; i > 16 - nb; i--) {                          \
             cpu_stb_data_ra(env, addr, xt->VsrB(i - 1), GETPC()); \
             addr = addr_add(env, addr, 1);                        \