tile: make the prolog of clone() more conformant
diff mbox

Message ID 201410021559.s92FxQG8020870@farm-0002.internal.tilera.com
State New
Headers show

Commit Message

Chris Metcalf Sept. 25, 2014, 8:53 p.m. UTC
With this change we properly set up the frame first, and tear
it down last, doing argument checking only when the frame is set up.
---
 sysdeps/unix/sysv/linux/tile/clone.S | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

2014-10-02  Chris Metcalf  <cmetcalf@tilera.com>

	* sysdeps/unix/sysv/linux/tile/clone.S (__clone): Fix code
	to set up frame more cleanly.

Patch
diff mbox

diff --git a/sysdeps/unix/sysv/linux/tile/clone.S b/sysdeps/unix/sysv/linux/tile/clone.S
index f48dba523c7c..0e109f849e95 100644
--- a/sysdeps/unix/sysv/linux/tile/clone.S
+++ b/sysdeps/unix/sysv/linux/tile/clone.S
@@ -41,10 +41,6 @@ 
 
 	.text
 ENTRY (__clone)
-	/* sanity check arguments */
-	BEQZ r0, .Linvalid
-	BEQZ r1, .Linvalid
-
 	/* Create a stack frame so we can pass callee-saves to new task. */
 	{
 	 move r10, sp
@@ -71,6 +67,10 @@  ENTRY (__clone)
 	ST r11, r32
 	cfi_offset (r32, FRAME_R32 - FRAME_SIZE)
 
+	/* sanity check arguments */
+	BEQZ r0, .Linvalid
+	BEQZ r1, .Linvalid
+
 	/* Make sure child stack is properly aligned, and set up the
 	   top frame so that we can call out of it immediately in the
 	   child.  Setting it up here means we fault in the parent if
@@ -120,6 +120,7 @@  ENTRY (__clone)
 	swint1
 	BEQZ r0, .Lthread_start  /* If in child task.  */
 
+.Ldone:
 	/* Restore the callee-saved registers and return. */
 	ADDLI_PTR lr, sp, FRAME_SIZE
 	{
@@ -149,7 +150,7 @@  ENTRY (__clone)
 .Linvalid:
 	{
 	 movei r1, EINVAL
-	 j SYSCALL_ERROR_NAME
+	 j .Ldone
 	}
 
 /* This function expects to receive: