use clone syscall for vfork

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Bernd Schmidt <bernds@codesourcery.com>

libc/sysdeps/linux/c6x/_vfork.S

@@ -1,55 +1,66 @@
- ;
- ; Port of uClibc for TMS320C6000 DSP architecture
- ; Copyright (C) 2004 Texas Instruments Incorporated
- ; Author of TMS320C6000 port: Aurelien Jacquiot
- ;
- ; This program is free software; you can redistribute it and/or modify it
- ; under the terms of the GNU Library General Public License as published by
- ; the Free Software Foundation; either version 2 of the License, or (at your
- ; option) any later version.
- ;
- ; This program is distributed in the hope that it will be useful, but WITHOUT
- ; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
- ; for more details.
- ;
- ; You should have received a copy of the GNU Library General Public License
- ; along with this program; if not, write to the Free Software Foundation,
- ; Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- ;
+/*
+ * Port of uClibc for TMS320C6000 DSP architecture
+ * Copyright (C) 2004, 2011 Texas Instruments Incorporated
+ * Author of TMS320C6000 port: Aurelien Jacquiot
+ *
+ *   Use clone syscall: Mark Salter <msalter@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#define __ASSEMBLY__
 
-;	.import __errno_location
-	.global __vfork
+#include <asm/errno.h>
+#include <sys/syscall.h>
+#include <linux/sched.h>
+#include <asm/signal.h>
 
+#define CLONE_FLAGS (CLONE_VFORK | CLONE_VM | SIGCHLD)
+	
+	.global __vfork
 __vfork:
-	MVK .S2	190,B0          ; __NR_vfork
+	MVK	.S2	SYS_clone,B0
+ ||	MVKL	.S1	CLONE_FLAGS,A4
+	MVKH	.S1	CLONE_FLAGS,A4
+ ||	MVK	.L2	0,B4
 #ifndef	_TMS320C6400_PLUS
-	MVC .S2     CSR,B2
-	CLR .S2     B2,0,0,B1
-	MVC .S2     B1,CSR
-	MVC .S2     IFR,B1
-	SET .S2     B1,6,6,B1
-	MVC .S2     B1,ISR
-	MVC .S2     B2,CSR
+	MVC	.S2	CSR,B2
+	CLR	.S2	B2,0,0,B1
+	MVC	.S2	B1,CSR
+	MVC	.S2	IFR,B1
+	SET	.S2	B1,6,6,B1
+	MVC	.S2	B1,ISR
+	MVC	.S2	B2,CSR
 	NOP
 #else
 	SWE
 #endif
 
-	MVK .S2	-4096,B4
-	CMPGTU .L2X	B4,A4,B2	; check error
- [B2]	BNOP .S2	B3,5
+	MVK	.S2	-4096,B4
+	CMPGTU	.L2X	B4,A4,B2	; check error
+  [B2]	BNOP	.S2	B3,5
 
-	NEG .S1	A4,A4
-	STW .D2T1	A4,*B15--[2]
-	STW .D2T2	B3,*+B15[1]
-	CALLP .S2	__errno_location,B3
-	LDW .D2T2	*+B15[1],B3
-	LDW .D2T1	*++B15[2],A5
+	NEG	.S1	A4,A4
+	STW	.D2T1	A4,*B15--[2]
+	STW	.D2T2	B3,*+B15[1]
+	CALLP	.S2	__errno_location,B3
+	LDW	.D2T2	*+B15[1],B3
+	LDW	.D2T1	*++B15[2],A5
 	NOP	3
-	BNOP .S2	B3,3
-	STW .D1T1	A5,*A4
-	MVK .L1	-1,A4
+	BNOP	.S2	B3,3
+	STW	.D1T1	A5,*A4
+	MVK	.L1	-1,A4
 
 weak_alias(__vfork,vfork)
 libc_hidden_weak(vfork)