[Qemu-devel] [PATCH V2 3/3] target-arm: Fix VFP register byte order in GDB remote

[Fabien Chouteau <chouteau@adacore.com>]

>From GDB Remote Serial Protocol doc:

"The bytes with the register are transmitted in target byte order."

Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
---
 target-arm/helper.c |   23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index e97e1a5..1ba25e1 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -16,18 +16,22 @@ static int vfp_gdb_get_reg(CPUARMState *env, uint8_t *buf, int reg)
 {
     int nregs;
 
-    /* VFP data registers are always little-endian.  */
     nregs = arm_feature(env, ARM_FEATURE_VFP3) ? 32 : 16;
     if (reg < nregs) {
-        stfq_le_p(buf, env->vfp.regs[reg]);
+        stfq_p(buf, env->vfp.regs[reg]);
         return 8;
     }
     if (arm_feature(env, ARM_FEATURE_NEON)) {
         /* Aliases for Q regs.  */
         nregs += 16;
         if (reg < nregs) {
-            stfq_le_p(buf, env->vfp.regs[(reg - 32) * 2]);
-            stfq_le_p(buf + 8, env->vfp.regs[(reg - 32) * 2 + 1]);
+#ifdef TARGET_WORDS_BIGENDIAN
+            stfq_p(buf, env->vfp.regs[(reg - 32) * 2 + 1]);
+            stfq_p(buf + 8, env->vfp.regs[(reg - 32) * 2]);
+#else
+            stfq_p(buf, env->vfp.regs[(reg - 32) * 2]);
+            stfq_p(buf + 8, env->vfp.regs[(reg - 32) * 2 + 1]);
+#endif  /* TARGET_WORDS_BIGENDIAN */
             return 16;
         }
     }
@@ -45,14 +49,19 @@ static int vfp_gdb_set_reg(CPUARMState *env, uint8_t *buf, int reg)
 
     nregs = arm_feature(env, ARM_FEATURE_VFP3) ? 32 : 16;
     if (reg < nregs) {
-        env->vfp.regs[reg] = ldfq_le_p(buf);
+        env->vfp.regs[reg] = ldfq_p(buf);
         return 8;
     }
     if (arm_feature(env, ARM_FEATURE_NEON)) {
         nregs += 16;
         if (reg < nregs) {
-            env->vfp.regs[(reg - 32) * 2] = ldfq_le_p(buf);
-            env->vfp.regs[(reg - 32) * 2 + 1] = ldfq_le_p(buf + 8);
+#ifdef TARGET_WORDS_BIGENDIAN
+            env->vfp.regs[(reg - 32) * 2 + 1] = ldfq_p(buf);
+            env->vfp.regs[(reg - 32) * 2] = ldfq_p(buf + 8);
+#else
+            env->vfp.regs[(reg - 32) * 2] = ldfq_p(buf);
+            env->vfp.regs[(reg - 32) * 2 + 1] = ldfq_p(buf + 8);
+#endif  /* TARGET_WORDS_BIGENDIAN */
             return 16;
         }
     }
-- 
1.7.9.5