[Qemu-devel] [PATCH 2/2] linux-user: register align p{read, write}64

[Alexander Graf <agraf@suse.de>]

pread64 and pwrite64 pass 64bit parameters which for some architectures need
to be aligned to special argument pairs, creating a gap argument.

Handle this special case the same way we handle it in other places of the code.

Reported-by: Alex Barcelo <abarcelo@ac.upc.edu>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
 linux-user/syscall.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 8cd56f2..7992b1b 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7423,12 +7423,20 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #endif
 #ifdef TARGET_NR_pread64
     case TARGET_NR_pread64:
+        if (regpairs_aligned(cpu_env)) {
+            arg4 = arg5;
+            arg5 = arg6;
+        }
         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 (regpairs_aligned(cpu_env)) {
+            arg4 = arg5;
+            arg5 = arg6;
+        }
         if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
             goto efault;
         ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));
-- 
1.6.0.2