/* Save current context.

   Copyright (C) 2001-2018 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 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, see

   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>

#include "ucontext_i.h"

ENTRY(__getcontext)

	/* Load address of the context data structure.  */

	movl	4(%esp), %eax

	/* Return value of getcontext.  EAX is the only register whose

	   value is not preserved.  */

	movl	$0, oEAX(%eax)

	/* Save the 32-bit register values and the return address.  */

	movl	%ecx, oECX(%eax)

	movl	%edx, oEDX(%eax)

	movl	%edi, oEDI(%eax)

	movl	%esi, oESI(%eax)

	movl	%ebp, oEBP(%eax)

	movl	(%esp), %ecx

	movl	%ecx, oEIP(%eax)

	leal	4(%esp), %ecx		/* Exclude the return address.  */

	movl	%ecx, oESP(%eax)

	movl	%ebx, oEBX(%eax)

	/* Save the FS segment register.  We don't touch the GS register

	   since it is used for threads.  */

	xorl	%edx, %edx

	movw	%fs, %dx

	movl	%edx, oFS(%eax)

	/* We have separate floating-point register content memory on the

	   stack.  We use the __fpregs_mem block in the context.  Set the

	   links up correctly.  */

	leal	oFPREGSMEM(%eax), %ecx

	movl	%ecx, oFPREGS(%eax)

	/* Save the floating-point context.  */

	fnstenv	(%ecx)

	/* And load it right back since the processor changes the mask.

	   Intel thought this opcode to be used in interrupt handlers which

	   would block all exceptions.  */

	fldenv	(%ecx)

	/* Save the current signal mask.  */

	pushl	%ebx

	cfi_adjust_cfa_offset (4)

	cfi_rel_offset (ebx, 0)

	leal	oSIGMASK(%eax), %edx

	xorl	%ecx, %ecx

	movl	$SIG_BLOCK, %ebx

	movl	$__NR_sigprocmask, %eax

	ENTER_KERNEL

	popl	%ebx

	cfi_adjust_cfa_offset (-4)

	cfi_restore (ebx)

	cmpl	$-4095, %eax		/* Check %eax for error.  */

	jae	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */

	/* All done, return 0 for success.  */

	xorl	%eax, %eax

	ret

PSEUDO_END(__getcontext)

weak_alias (__getcontext, getcontext)