/* Save current context.
   Copyright (C) 2015-2017 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, see
   <http://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include "ucontext_i.h"

/* int getcontext (ucontext_t *ucp)

   Returns 0 on success -1 and errno on failure.
 */
	.text
ENTRY(__getcontext)
	stw	r16, (UCONTEXT_MCONTEXT + 16*4)(r4)
	stw	r17, (UCONTEXT_MCONTEXT + 17*4)(r4)
	stw	r18, (UCONTEXT_MCONTEXT + 18*4)(r4)
	stw	r19, (UCONTEXT_MCONTEXT + 19*4)(r4)
	stw	r20, (UCONTEXT_MCONTEXT + 20*4)(r4)
	stw	r21, (UCONTEXT_MCONTEXT + 21*4)(r4)
	stw	r22, (UCONTEXT_MCONTEXT + 22*4)(r4)
	stw	ra,  (UCONTEXT_MCONTEXT + 24*4)(r4)
	stw	fp,  (UCONTEXT_MCONTEXT + 25*4)(r4)
	stw	gp,  (UCONTEXT_MCONTEXT + 26*4)(r4)
	/* Store return address at place for EA.  */
	stw	ra,  (UCONTEXT_MCONTEXT + 28*4)(r4)
	stw	sp,  (UCONTEXT_MCONTEXT + 29*4)(r4)
	/* Store zero for return success.  */
	stw	zero, (UCONTEXT_MCONTEXT + 2*4)(r4)

	/* Store value "1" at uc_flags to recognize as getcontext created.  */
	movi	r2, 1
	stw	r2, UCONTEXT_FLAGS(r4)

	/* Store MCONTEXT_VERSION at first word of mcontext_t.  */
	movi	r2, MCONTEXT_VERSION
	stw	r2, UCONTEXT_MCONTEXT(r4)

	/* Get signal mask.  */
	/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
	movi	r7, _NSIG8
	addi	r6, r4, UCONTEXT_SIGMASK
	mov	r5, zero
	movi	r4, SIG_BLOCK
	movi	r2, SYS_ify (rt_sigprocmask)
	trap
	bne	r7, zero, SYSCALL_ERROR_LABEL

	mov	r2, zero
	ret

PSEUDO_END(__getcontext)
weak_alias(__getcontext, getcontext)
