Update.

2001-04-07  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/i386/getcontext.S: New file.
	* sysdeps/unix/sysv/linux/i386/setcontext.S: New file.
	* sysdeps/unix/sysv/linux/i386/makecontext.S: New file.
	* sysdeps/unix/sysv/linux/i386/swapcontext.S: New file.
	* sysdeps/unix/sysv/linux/i386/ucontext_i.h: New file.
	* sysdeps/unix/sysv/linux/i386/Dist: Add ucontext_i.h.

1 files changed, 96 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/i386/setcontext.S b/sysdeps/unix/sysv/linux/i386/setcontext.S
new file mode 100644
index 0000000000..cd4b1bfe8a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/i386/setcontext.S
@@ -0,0 +1,96 @@
+/* Install given context.
+   Copyright (C) 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
+
+   The GNU C Library 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.
+
+   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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  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"
+
+
+ENTRY(__setcontext)
+	/* Load address of the context data structure.  */
+	movl	4(%esp), %eax
+
+	/* Get the current signal mask.  Note that we preserve EBX in case
+	   the system call fails and we return from the function with an
+	   error.  */
+	pushl	%ebx
+	xorl	%edx, %edx
+	leal	oSIGMASK(%eax), %ecx
+	movl	$SIG_SETMASK, %ebx
+	movl	$__NR_sigprocmask, %eax
+	int	$0x80
+	popl	%ebx
+	cmpl	$-4095, %eax		/* Check %eax for error.  */
+	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
+
+	/* EAX was modified, reload it.  */
+	movl	4(%esp), %eax
+
+	/* Restore the floating-point context.  Not the registers, only the
+	   rest.  */
+	movl	oFPREGS(%eax), %ecx
+	fldenv	(%ecx)
+
+	/* Restore the FS and GS segment registers.  */
+	movl	oGS(%eax), %edx
+	movl	oFS(%eax), %ecx
+	movw	%dx, %gs
+	movw	%cx, %fs
+
+	/* Load the new stack pointer.  */
+	movl	oESP(%eax), %ecx
+	/* Make room for 8 registers and the return address.  We will load
+	   the values from the stack.  */
+	subl	$36, %ecx
+
+	/* Move the values of all the 32-bit registers (except ESP) on
+	   the stack.  This happens in the form the 'popa' instruction
+	   expects it.  Before this block put the address of the code
+	   to execute.  */
+	movl	oEDI(%eax), %ebx
+	movl	oESI(%eax), %edx
+	movl	oEBP(%eax), %esi
+	movl	oEBX(%eax), %edi
+	movl	%ebx, (%ecx)
+	movl	%edx, 4(%ecx)
+	movl	%esi, 8(%ecx)
+	movl	%edi, 16(%ecx)
+	movl	oEDX(%eax), %ebx
+	movl	oECX(%eax), %edx
+	movl	oEAX(%eax), %esi
+	movl	oEIP(%eax), %edi
+	movl	%ebx, 20(%ecx)
+	movl	%edx, 24(%ecx)
+	movl	%esi, 28(%ecx)
+	movl	%edi, 32(%ecx)
+
+	/* Set the new stack address.  The stack points now to the block
+	   we put the register content in.  */
+	movl	%ecx, %esp
+	/* Restore the register content.  */
+	popa
+	/* The following 'ret' will pop the addres of the code and jump
+	   to it.  */
+
+L(pseudo_end):
+	ret
+PSEUDO_END(__setcontext)
+
+weak_alias(__setcontext, setcontext)