1/* Save current context.
2   Copyright (C) 2005-2021 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
23/*  int __getcontext (ucontext_t *uc);  */
24
25	.text
26	.align  5
27ENTRY(__getcontext)
28
29	/* Return value of getcontext.  R0 is the only register whose
30	   value is not preserved.  */
31	mov	#0, r0
32	mov.l	r0, @(oR0,r4)
33	mov.l	r1, @(oR1,r4)
34	mov.l	r2, @(oR2,r4)
35	mov.l	r3, @(oR3,r4)
36	mov.l	r4, @(oR4,r4)
37	mov.l	r5, @(oR5,r4)
38	mov.l	r6, @(oR6,r4)
39	mov.l	r7, @(oR7,r4)
40	mov	r4, r0
41	add	#(oMACL+4), r0
42	sts.l	macl, @-r0
43	sts.l	mach, @-r0
44	stc.l	gbr, @-r0
45
46	/* Save T flag to SR.  */
47	movt	r1
48	mov.l	r1, @-r0
49	sts.l	pr, @-r0
50
51	/* The return address of getcontext is the restart pc.  */
52	sts.l	pr, @-r0
53
54	mov.l	r15, @-r0
55	mov.l	r14, @-r0
56	mov.l	r13, @-r0
57	mov.l	r12, @-r0
58	mov.l	r11, @-r0
59	mov.l	r10, @-r0
60	mov.l	r9, @-r0
61	mov.l	r8, @-r0
62
63	/* sigprocmask (SIG_BLOCK, NULL, &uc->uc_sigmask).  */
64	mov	r4, r6
65	add	#oSIGMASK, r6
66	mov	#SIG_BLOCK, r4
67	mov	#0, r5
68	mov	#+SYS_ify(sigprocmask), r3
69	trapa	#0x13
70	mov     r0, r1
71	mov	#-12, r2
72	shad	r2, r1
73	not	r1, r1			// r1=0 means r0 = -1 to -4095
74	tst	r1, r1			// i.e. error in linux
75	bf	.Lgetcontext_end
76.Lsyscall_error:
77	SYSCALL_ERROR_HANDLER
78.Lgetcontext_end:
79	/* All done, return 0 for success.  */
80	mov	#0, r0
81.Lpseudo_end:
82	rts
83	 nop
84
85PSEUDO_END(__getcontext)
86
87weak_alias (__getcontext, getcontext)
88