/* Save current context.

   Copyright (C) 2008-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by David S. Miller <davem@davemloft.net>, 2008.

   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)

  Saves the machine context in UCP such that when it is activated,

  it appears as if __getcontext() returned again.

  This implementation is intended to be used for *synchronous* context

  switches only.  Therefore, it does not have to save anything

  other than the PRESERVED state.  */

ENTRY(__getcontext)

	save	%sp, -112, %sp

	st	%g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR]

	/* In reality, we only use the GREG_PC value when setting

	   or swapping contexts.  But we fill in NPC for completeness.  */

	add	%i7, 8, %o0

	st	%o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC]

	add	%o0, 4, %o0

	st	%o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC]

	rd	%y, %o1

	st	%o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y]

	st	%g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1]

	st	%g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2]

	st	%g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3]

	st	%g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4]

	st	%g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5]

	st	%g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6]

	st	%g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7]

	mov	SIG_BLOCK, %o0

	clr	%o1

	add	%i0, UC_SIGMASK, %o2

	mov	8, %o3

	mov	__NR_rt_sigprocmask, %g1

	ta	0x10

	/* Zero, success, return value.  */

	st	%g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0]

	st	%i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1]

	st	%i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2]

	st	%i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3]

	st	%i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4]

	st	%i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5]

	st	%i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6]

	st	%i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7]

	st	%g0, [%i0 + UC_MCONTEXT + MC_GWINS]

	/* Do not save FPU state, it is volatile across calls.  */

	stb	%g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN]

	st	%g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID]

	st	%g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR]

	jmpl	%i7 + 8, %g0

	 restore %g0, %g0, %o0

END(__getcontext)

weak_alias (__getcontext, getcontext)