2.5-18.1

1 files changed, 145 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/sh/makecontext.S b/sysdeps/unix/sysv/linux/sh/makecontext.S
new file mode 100644
index 0000000000..877d78d396
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sh/makecontext.S
@@ -0,0 +1,145 @@
+/* Create new context.
+   Copyright (C) 2005 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.  */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* void __makecontext (struct ucontext *ucp, void (*func)(), int argc, ...);
+  __makecontext sets up a stack and registers for context to run a given
+  function.  The registers are set up like this:
+    r4-r7: parameters 1 to 4
+    r8	 : uc_link from ucontext structure
+    pc	 : (*func) pointer
+    pr	 : address of exitcode
+    r15	 : stack pointer for func.  */
+
+	.text
+	.align	5
+ENTRY(__makecontext)
+	mov	#4, r3
+	mov.l	@(oSS_SP,r4), r1
+	mov.l	@(oSS_SIZE,r4), r2
+	add	r1, r2
+	cmp/gt	r6, r3
+	bf/s	1f
+	 shlr2	r2
+	sub	r6, r2
+	add	r3, r2
+1:
+	shll2	r2
+	mov	#oR15, r0
+	mov.l	@(oLINK,r4), r1
+	mov.l	r2, @(r0,r4)
+	mov.l	r1, @(oR8,r4)
+	mov	#oPC, r0
+	mov.l	r5, @(r0,r4)
+
+	cmp/pl	r6
+	bf/s	.L1
+	 dt	r6
+	mov.l	r7, @(oR4,r4)
+	cmp/pl	r6
+	bf/s	.L1
+	 dt	r6
+	mov.l	@(0,r15), r1
+	mov.l	r1, @(oR5,r4)
+	cmp/pl	r6
+	bf/s	.L1
+	 dt	r6
+	mov.l	@(4,r15), r1
+	mov.l	r1, @(oR6,r4)
+	cmp/pl	r6
+	bf/s	.L1
+	 dt	r6
+	mov.l	@(8,r15), r1
+	mov.l	r1, @(oR7,r4)
+	mov	#12,r0
+.L0:
+	cmp/pl	r6
+	bf/s	.L1
+	 dt	r6
+	mov.l	@(r0,r15), r1
+	mov.l	r1, @r2
+	add	#4, r0
+	bra	.L0
+	 add	#4, r2
+.L1:
+#ifdef PIC
+	mova	.Lexitcode, r0
+#else
+	mov.l	.L2, r0
+#endif
+	add	#oPR, r4
+	rts
+	 mov.l	r0, @r4
+#ifndef PIC
+	.align	2
+.L2:
+	.long	.Lexitcode
+#endif
+	cfi_endproc
+
+	.align	5
+.Lexitcode:
+	tst	r8, r8
+	bt/s	2f
+	 mov	r8, r4
+#ifdef PIC
+	mova	.Lgot, r0
+	mov.l	.Lgot, r12
+	add	r0, r12
+	mov.l	.L3, r1
+	bsrf	r1
+.LPCS0:
+	 nop
+#else
+	mov.l	.L3, r1
+	jsr	@r1
+	 nop
+#endif
+2:
+	mov.l	.L4, r1
+#ifdef PIC
+	add	r12, r1
+#endif
+	jsr	@r1
+	 mov	r0, r4
+0:
+	bra	0b
+	 nop
+
+	.align	2
+#ifdef PIC
+.Lgot:
+	.long	_GLOBAL_OFFSET_TABLE_
+.L3:
+	.long	__setcontext@PLT-(.LPCS0+2-(.))
+.L4:
+	.long	HIDDEN_JUMPTARGET(exit)@GOTOFF
+#else
+.L3:
+	.long	__setcontext
+.L4:
+	.long	HIDDEN_JUMPTARGET(exit)
+#endif
+	cfi_startproc
+PSEUDO_END(__makecontext)
+
+weak_alias (__makecontext, makecontext)