The C6X port

This adds support for the TI C6X family of processors.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Bernd Schmidt <bernds@codesourcery.com>

1 files changed, 97 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/c6x/clone.S b/libc/sysdeps/linux/c6x/clone.S
new file mode 100644
index 000000000..8d9da4b49
--- /dev/null
+++ b/libc/sysdeps/linux/c6x/clone.S
@@ -0,0 +1,97 @@
+ ;
+ ; 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
+ ;
+
+	; int _clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg);
+
+#include <asm/errno.h>
+#include <sys/syscall.h>
+
+	.global __clone
+	.global	clone
+	.global	__errno_location
+
+ ;Currently supports only
+ ;int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg)
+ ;
+ ;Requires update for supporting
+ ; int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
+ ;	    int *parent_tidptr, struct user_desc *newtls, int *child_pidptr)
+
+__clone:
+	; index 1 points to the forth argument and is to be moved to B6
+	LDW .D2T2	*+B15[1],B5
+	NOP     4
+	OR .D2X	B4,A4,B2	; sanity check arguments, no NULL function or stack pointers
+||	MV .S2	B4,B9
+||	MV .D1	A4,A9		; backup fn and child_stack pointers
+
+  [!B2]	B .S2	__syscall_error
+||[!B2] MVK .S1	EINVAL,A4
+	NOP	4
+
+	MV .D1	A6,A4		; get flags as arg0, arg1 is the new stack
+||	AND .D2	~7,B4,B4
+
+	; do the system call
+||	MVK .S2	120,B0		; __NR_clone
+||	MV .L2  B5,B6
+0:
+#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
+	NOP
+#else
+	SWE
+#endif
+
+	MV .D2	B9,B4		; restore child stack
+
+||	CMPEQ .L1	0,A4,A2
+||	CMPLT .L2X	A4,0,B2
+
+   [B2]	B .S2	__syscall_error	; if syscall < 0, it is an error
+	NOP	5
+   [A2] B .S2X	A9		; branch to function
+|| [A2] MV .D1X	B6,A4		; set arg (B6 is preserved by syscall)
+  [!A2] B .S2	B3		; otherwise (syscall result > 0) returns directly
+   [A2]	ADDKPC .S2	__return_thread,B3, 4
+
+__return_thread:
+	b	.s2	HIDDEN_JUMPTARGET(_exit)
+	nop	5
+
+__syscall_error:
+	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
+
+.set clone, __clone