1/* Install given context.
2   Copyright (C) 2012-2021 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <sysdep.h>
20
21#include "ucontext_i.h"
22
23ENTRY(__setcontext)
24	/* Load address of the context data structure.  */
25	move.l	4(%sp), %a0
26
27	/* Get the current signal mask.  Note that we preserve D2/D3 in case
28	   the system call fails and we return from the function with an
29	   error.  */
30	move.l	%d3, -(%sp)
31	cfi_adjust_cfa_offset (4)
32	cfi_rel_offset (%d3, 0)
33	move.l	%d2, -(%sp)
34	cfi_adjust_cfa_offset (4)
35	cfi_rel_offset (%d2, 0)
36	clr.l	%d3
37	lea	oSIGMASK(%a0), %a1
38	move.l	%a1, %d2
39	move.l	#SIG_SETMASK, %d1
40	move.l	#__NR_sigprocmask, %d0
41	trap	#0
42	cmp.l	#-4095, %d0		/* Check %d0 for error.  */
43	jcs	0f
44	move.l	(%sp)+, %d2
45	cfi_adjust_cfa_offset (-4)
46	cfi_restore (d2)
47	move.l	(%sp)+, %d3
48	cfi_adjust_cfa_offset (-4)
49	cfi_restore (d3)
50	jra	SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
51
520:	/* Load the new stack pointer.  */
53	move.l	oSP(%a0), %sp
54	cfi_def_cfa (%a0, 0)
55	cfi_offset (%d2, oGREGS+2*4)
56	cfi_offset (%d3, oGREGS+3*4)
57	cfi_offset (%d4, oGREGS+4*4)
58	cfi_offset (%d5, oGREGS+5*4)
59	cfi_offset (%d6, oGREGS+6*4)
60	cfi_offset (%d7, oGREGS+7*4)
61	cfi_offset (%a2, oGREGS+10*4)
62	cfi_offset (%a3, oGREGS+11*4)
63	cfi_offset (%a4, oGREGS+12*4)
64	cfi_offset (%a5, oGREGS+13*4)
65	cfi_offset (%a6, oGREGS+14*4)
66	cfi_offset (%fp2, oFP2+0*12)
67	cfi_offset (%fp3, oFP2+1*12)
68	cfi_offset (%fp4, oFP2+2*12)
69	cfi_offset (%fp5, oFP2+3*12)
70	cfi_offset (%fp6, oFP2+4*12)
71	cfi_offset (%fp7, oFP2+5*12)
72	cfi_offset (%pc, oPC)
73
74	/* Load the values of all the preserved registers (except SP).  */
75	movem.l	oGREGS+2*4(%a0), %d2-%d7
76	movem.l	oGREGS+10*4(%a0), %a2-%a6
77	fmovem.l oFPREGS(%a0), %fpsr/%fpcr/%fpiar
78	fmovem.x oFP2(%a0), %fp2-%fp7
79	clr.l	%d0
80
81	/* Fetch the address to return to.  */
82	movl	oPC(%a0), %a1
83
84	/* End FDE here, we fall into another context.  */
85	cfi_endproc
86	cfi_startproc
87	cfi_register (%pc, %a1)
88
89	jmp	(%a1)
90
91	cfi_offset (%pc, -4)
92PSEUDO_END(__setcontext)
93
94weak_alias (__setcontext, setcontext)
95