[PATCH] linux-user/riscv: fix up struct target_ucontext definition

[LIU Zhiwei <zhiwei_liu@c-sky.com>]

As struct target_ucontext will be transfered to signal handler, it
must keep pace with struct ucontext_t defined in Linux kernel.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
---
 linux-user/riscv/signal.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/linux-user/riscv/signal.c b/linux-user/riscv/signal.c
index 83ecc6f799..67a95dbc7b 100644
--- a/linux-user/riscv/signal.c
+++ b/linux-user/riscv/signal.c
@@ -40,8 +40,9 @@ struct target_ucontext {
     unsigned long uc_flags;
     struct target_ucontext *uc_link;
     target_stack_t uc_stack;
-    struct target_sigcontext uc_mcontext;
     target_sigset_t uc_sigmask;
+    uint8_t   __unused[1024 / 8 - sizeof(target_sigset_t)];
+    struct target_sigcontext uc_mcontext QEMU_ALIGNED(16);
 };
 
 struct target_rt_sigframe {
-- 
2.23.0