[PULL 4/9] linux-user: Add open_tree() syscall

[Laurent Vivier <laurent@vivier.eu>]

From: Thomas Weißschuh <thomas@t-8ch.de>

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20230424153429.276788-2-thomas@t-8ch.de>
[lv: move declaration at the beginning of the block]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/syscall.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fccc46e609c6..95da74ab1234 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -9196,6 +9196,33 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
             return ret;
         }
 #endif
+#ifdef TARGET_NR_open_tree
+    case TARGET_NR_open_tree:
+        {
+            void *p2;
+            int host_flags;
+
+            if (!arg2) {
+                return -TARGET_EFAULT;
+            }
+
+            p2 = lock_user_string(arg2);
+            if (!p2) {
+                return -TARGET_EFAULT;
+            }
+
+            host_flags = arg3 & ~TARGET_O_CLOEXEC;
+            if (arg3 & TARGET_O_CLOEXEC) {
+                host_flags |= O_CLOEXEC;
+            }
+
+            ret = get_errno(open_tree(arg1, p2, host_flags));
+
+            unlock_user(p2, arg2, 0);
+
+            return ret;
+        }
+#endif
 #ifdef TARGET_NR_stime /* not on alpha */
     case TARGET_NR_stime:
         {
-- 
2.40.1