From 3fc6ba17b7a9919dd01a1c47853a4944fc990079 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 1 Mar 2002 21:09:56 +0000
Subject: Patch from M. R. Brown <mrbrown@0xd6.org> to fix pthread support for
 SH, and fix vfork

---
 libc/sysdeps/linux/sh/clone.S | 137 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 libc/sysdeps/linux/sh/clone.S

(limited to 'libc/sysdeps/linux/sh/clone.S')

diff --git a/libc/sysdeps/linux/sh/clone.S b/libc/sysdeps/linux/sh/clone.S
new file mode 100644
index 000000000..95ae6647c
--- /dev/null
+++ b/libc/sysdeps/linux/sh/clone.S
@@ -0,0 +1,137 @@
+/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <asm/unistd.h>
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
+
+        .text
+.extern __syscall_error
+
+ENTRY(__clone)
+	/* sanity check arguments.  */
+	tst	r4, r4
+	bf/s	1f
+	 tst	r5, r5
+	bf/s	1f
+	 mov.l	.L1, r1
+#ifdef SHARED
+	mov.l	r12, @-r15
+	sts.l	pr, @-r15
+        mov.l	.LG, r12
+	mova	.LG, r0
+	add	r0, r12
+	mova	.L1, r0
+	add	r0, r1
+	jsr	@r1
+	 mov	#-EINVAL, r4
+	lds.l	@r15+, pr
+	rts
+	 mov.l	@r15+, r12
+#else
+	jmp	@r1
+	 mov	#-EINVAL, r4
+#endif
+	.align	2
+.L1:
+	.long	PLTJMP(C_SYMBOL_NAME(__syscall_error))
+1:
+	/* insert the args onto the new stack */
+	mov.l	r7, @-r5
+	/* save the function pointer as the 0th element */
+	mov.l	r4, @-r5
+
+	/* do the system call */
+	mov	r6, r4
+	mov	#+__NR_clone, r3
+	trapa	#0x12
+	mov     r0, r1
+	mov	#-12, r2
+	shad	r2, r1
+	not	r1, r1			// r1=0 means r0 = -1 to -4095
+	tst	r1, r1			// i.e. error in linux
+	bf	2f
+	mov.l	.L2, r1
+#ifdef SHARED
+	mov	r0, r4
+	mov.l	r12, @-r15
+	sts.l	pr, @-r15
+        mov.l	.LG, r12
+	mova	.LG, r0
+	add	r0, r12
+	mova	.L2, r0
+	add	r0, r1
+	jsr	@r1
+	 nop
+	lds.l	@r15+, pr
+	rts
+	 mov.l	@r15+, r12
+#else
+	jmp	@r1
+	 mov	r0, r4
+#endif
+	.align	2
+.L2:
+	.long	PLTJMP(C_SYMBOL_NAME(__syscall_error))
+
+2:
+	tst	r0, r0
+	bt	3f
+	rts
+	 nop
+3:
+	/* thread starts */
+	mov.l	@r15, r1
+	jsr	@r1
+	 mov.l	@(4,r15), r4
+
+	/* we are done, passing the return value through r0  */
+	mov.l	.L3, r1
+#ifdef SHARED
+	mov.l	r12, @-r15
+	sts.l	pr, @-r15
+	mov	r0, r4
+	mova	.LG, r0
+	mov.l	.LG, r12
+	add	r0, r12
+	mova	.L3, r0
+	add	r0, r1
+	jsr	@r1
+	 nop
+	lds.l	@r15+, pr
+	rts
+	 mov.l	@r15+, r12
+#else
+	jmp	@r1
+	 mov	r0, r4
+#endif
+	.align	2
+.LG:
+	.long	_GLOBAL_OFFSET_TABLE_
+.L3:
+	.long	PLTJMP(C_SYMBOL_NAME(_exit))
+	END(__clone)
+
+.globl  clone;
+    clone = __clone
-- 
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