I think the previous patch was wrong, since we just emulate writing to
child_tidptr. Below is updated RFC patch.
---
[PATCH] linux-user: Adjust child_tidptr on set_tid_address()
Keep track of the new child tidptr given by a set_tid_address() syscall.
Signed-off-by: Helge Deller
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f65045efe6..9114c611a0 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -320,9 +320,6 @@ _syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
#ifdef __NR_exit_group
_syscall1(int,exit_group,int,error_code)
#endif
-#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
-_syscall1(int,set_tid_address,int *,tidptr)
-#endif
#if defined(__NR_futex)
_syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
const struct timespec *,timeout,int *,uaddr2,int,val3)
@@ -12200,9 +12197,14 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
}
#endif
-#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
+#if defined(TARGET_NR_set_tid_address)
case TARGET_NR_set_tid_address:
-return get_errno(set_tid_address((int *)g2h(cpu, arg1)));
+{
+TaskState *ts = cpu->opaque;
+ts->child_tidptr = arg1;
+/* do not call host set_tid_address() syscall, instead return tid() */
+return get_errno(sys_gettid());
+}
#endif
case TARGET_NR_tkill:
