From: Greg Kurz <gkurz@linux.vnet.ibm.com>
Date: Fri, 15 Jan 2016 16:00:31 +0100
Subject: [PATCH] target-ppc: gdbstub: introduce avr_need_swap()

This helper will be used to support Altivec registers in little-endian guests.
This patch does not change functionnality.

Note: I had to put the helper some lines away from the gdb_*_avr_reg()
routines to get a more readable patch.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
(cherry picked from commit 87601e2d5c22d9c1fef0e09978d377f46336c1db)
---
 target-ppc/translate_init.c | 37 +++++++++++++++++++++++--------------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 51fa03c..c1d2db6 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -8754,6 +8754,15 @@ static void dump_ppc_insns (CPUPPCState *env)
 }
 #endif
 
+static bool avr_need_swap(CPUPPCState *env)
+{
+#ifdef HOST_WORDS_BIGENDIAN
+    return false;
+#else
+    return true;
+#endif
+}
+
 static int gdb_get_float_reg(CPUPPCState *env, uint8_t *mem_buf, int n)
 {
     if (n < 32) {
@@ -8787,13 +8796,13 @@ static int gdb_set_float_reg(CPUPPCState *env, uint8_t *mem_buf, int n)
 static int gdb_get_avr_reg(CPUPPCState *env, uint8_t *mem_buf, int n)
 {
     if (n < 32) {
-#ifdef HOST_WORDS_BIGENDIAN
-        stq_p(mem_buf, env->avr[n].u64[0]);
-        stq_p(mem_buf+8, env->avr[n].u64[1]);
-#else
-        stq_p(mem_buf, env->avr[n].u64[1]);
-        stq_p(mem_buf+8, env->avr[n].u64[0]);
-#endif
+        if (!avr_need_swap(env)) {
+            stq_p(mem_buf, env->avr[n].u64[0]);
+            stq_p(mem_buf+8, env->avr[n].u64[1]);
+        } else {
+            stq_p(mem_buf, env->avr[n].u64[1]);
+            stq_p(mem_buf+8, env->avr[n].u64[0]);
+        }
         return 16;
     }
     if (n == 32) {
@@ -8810,13 +8819,13 @@ static int gdb_get_avr_reg(CPUPPCState *env, uint8_t *mem_buf, int n)
 static int gdb_set_avr_reg(CPUPPCState *env, uint8_t *mem_buf, int n)
 {
     if (n < 32) {
-#ifdef HOST_WORDS_BIGENDIAN
-        env->avr[n].u64[0] = ldq_p(mem_buf);
-        env->avr[n].u64[1] = ldq_p(mem_buf+8);
-#else
-        env->avr[n].u64[1] = ldq_p(mem_buf);
-        env->avr[n].u64[0] = ldq_p(mem_buf+8);
-#endif
+        if (!avr_need_swap(env)) {
+            env->avr[n].u64[0] = ldq_p(mem_buf);
+            env->avr[n].u64[1] = ldq_p(mem_buf+8);
+        } else {
+            env->avr[n].u64[1] = ldq_p(mem_buf);
+            env->avr[n].u64[0] = ldq_p(mem_buf+8);
+        }
         return 16;
     }
     if (n == 32) {