[Qemu-devel] [PATCH] linux-user/syscall.c: Handle SH4's exceptional alignment for p{read, write}64

[James Clarke]

Fixes: https://bugs.launchpad.net/qemu/+bug/1716767
Signed-off-by: James Clarke <address@hidden>
---
 linux-user/syscall.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 9b6364a266..24d6a81c21 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -10495,20 +10495,32 @@ abi_long do_syscall(void *cpu_env, int num, abi_long 
arg1,
 #endif
 #ifdef TARGET_NR_pread64
     case TARGET_NR_pread64:
+#if defined(TARGET_SH4)
+        /* SH4 doesn't align register pairs, except for p{read,write}64 */
+        arg4 = arg5;
+        arg5 = arg6;
+#else
         if (regpairs_aligned(cpu_env)) {
             arg4 = arg5;
             arg5 = arg6;
         }
+#endif
         if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
             goto efault;
         ret = get_errno(pread64(arg1, p, arg3, target_offset64(arg4, arg5)));
         unlock_user(p, arg2, ret);
         break;
     case TARGET_NR_pwrite64:
+#if defined(TARGET_SH4)
+        /* SH4 doesn't align register pairs, except for p{read,write}64 */
+        arg4 = arg5;
+        arg5 = arg6;
+#else
         if (regpairs_aligned(cpu_env)) {
             arg4 = arg5;
             arg5 = arg6;
         }
+#endif
         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
             goto efault;
         ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));
--
2.13.2