/* Install given context.
   Copyright (C) 2012-2024 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
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>

#include "ucontext_i.h"

ENTRY(__setcontext)
	/* Load address of the context data structure.  */
	move.l	4(%sp), %a0

	/* Get the current signal mask.  Note that we preserve D2/D3 in case
	   the system call fails and we return from the function with an
	   error.  */
	move.l	%d3, -(%sp)
	cfi_adjust_cfa_offset (4)
	cfi_rel_offset (%d3, 0)
	move.l	%d2, -(%sp)
	cfi_adjust_cfa_offset (4)
	cfi_rel_offset (%d2, 0)
	clr.l	%d3
	lea	oSIGMASK(%a0), %a1
	move.l	%a1, %d2
	move.l	#SIG_SETMASK, %d1
	move.l	#__NR_sigprocmask, %d0
	trap	#0
	cmp.l	#-4095, %d0		/* Check %d0 for error.  */
	jcs	0f
	move.l	(%sp)+, %d2
	cfi_adjust_cfa_offset (-4)
	cfi_restore (d2)
	move.l	(%sp)+, %d3
	cfi_adjust_cfa_offset (-4)
	cfi_restore (d3)
	jra	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */

0:	/* Load the new stack pointer.  */
	move.l	oSP(%a0), %sp
	cfi_def_cfa (%a0, 0)
	cfi_offset (%d2, oGREGS+2*4)
	cfi_offset (%d3, oGREGS+3*4)
	cfi_offset (%d4, oGREGS+4*4)
	cfi_offset (%d5, oGREGS+5*4)
	cfi_offset (%d6, oGREGS+6*4)
	cfi_offset (%d7, oGREGS+7*4)
	cfi_offset (%a2, oGREGS+10*4)
	cfi_offset (%a3, oGREGS+11*4)
	cfi_offset (%a4, oGREGS+12*4)
	cfi_offset (%a5, oGREGS+13*4)
	cfi_offset (%a6, oGREGS+14*4)
	cfi_offset (%fp2, oFP2+0*12)
	cfi_offset (%fp3, oFP2+1*12)
	cfi_offset (%fp4, oFP2+2*12)
	cfi_offset (%fp5, oFP2+3*12)
	cfi_offset (%fp6, oFP2+4*12)
	cfi_offset (%fp7, oFP2+5*12)
	cfi_offset (%pc, oPC)

	/* Load the values of all the preserved registers (except SP).  */
	movem.l	oGREGS+2*4(%a0), %d2-%d7
	movem.l	oGREGS+10*4(%a0), %a2-%a6
	fmovem.l oFPREGS(%a0), %fpsr/%fpcr/%fpiar
	fmovem.x oFP2(%a0), %fp2-%fp7
	clr.l	%d0

	/* Fetch the address to return to.  */
	movl	oPC(%a0), %a1

	/* End FDE here, we fall into another context.  */
	cfi_endproc
	cfi_startproc
	cfi_register (%pc, %a1)

	jmp	(%a1)

	cfi_offset (%pc, -4)
PSEUDO_END(__setcontext)

weak_alias (__setcontext, setcontext)