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From: Helge Deller <>
To: Laurent Vivier <>,
Cc: Richard Henderson <>
Subject: [PATCH v3] linux-user: Adjust child_tidptr on set_tid_address() syscall
Date: Sat, 28 May 2022 12:52:10 +0200	[thread overview]
Message-ID: <YpH+2sw1PCRqx/te@p100> (raw)

Keep track of the new child tidptr given by a set_tid_address() syscall.

Do not call the host set_tid_address() syscall because we are emulating
the behaviour of writing to child_tidptr in the exit() path.

Signed-off-by: Helge Deller<>
Reviewed-by: Richard Henderson <>

- Respin of the patch because the v2 version was mungled in-between the
  mail of the v1 version. Now it's possible to get correct patch with b4
- Rephrased commit message
- Added Richard's Reviewed-by
- was mungled in v1 mail thread

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f55cdebee5..1166e9f014 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
-#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
-_syscall1(int,set_tid_address,int *,tidptr)
 #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(CPUArchState *cpu_env, int num, abi_long arg1,

-#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());
+    }

     case TARGET_NR_tkill:

             reply	other threads:[~2022-05-28 10:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-28 10:52 Helge Deller [this message]
2022-06-21 18:26 ` [PATCH v3] linux-user: Adjust child_tidptr on set_tid_address() syscall Laurent Vivier
2022-06-21 18:33 ` Laurent Vivier

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