1/* Save current context.  OpenRISC version.
2   Copyright (C) 2022 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#include "ucontext_i.h"
21
22/* int getcontext (ucontext_t *ucp)
23
24   Returns 0 on success -1 and errno on failure.
25 */
26	.text
27ENTRY(__getcontext)
28	/* Store r1, the stack pointer.  */
29	l.sw	(UCONTEXT_MCONTEXT +  1*4)(r3), r1
30	/* Store r2, the frame pointer.  */
31	l.sw	(UCONTEXT_MCONTEXT +  2*4)(r3), r2
32	/* Store r9, the link register.  */
33	l.sw	(UCONTEXT_MCONTEXT +  9*4)(r3), r9
34	/* Store r9 to reg[11] too, as we need two links for makecontext.  */
35	l.sw	(UCONTEXT_MCONTEXT + 11*4)(r3), r9
36	/* Store r10, the TLS register.  */
37	l.sw	(UCONTEXT_MCONTEXT + 10*4)(r3), r10
38	/* Store r14-r30 even, callee saved registers.  */
39	l.sw	(UCONTEXT_MCONTEXT + 14*4)(r3), r14
40	l.sw	(UCONTEXT_MCONTEXT + 16*4)(r3), r16
41	l.sw	(UCONTEXT_MCONTEXT + 18*4)(r3), r18
42	l.sw	(UCONTEXT_MCONTEXT + 20*4)(r3), r20
43	l.sw	(UCONTEXT_MCONTEXT + 22*4)(r3), r22
44	l.sw	(UCONTEXT_MCONTEXT + 24*4)(r3), r24
45	l.sw	(UCONTEXT_MCONTEXT + 26*4)(r3), r26
46	l.sw	(UCONTEXT_MCONTEXT + 28*4)(r3), r28
47	l.sw	(UCONTEXT_MCONTEXT + 30*4)(r3), r30
48
49	/* Get signal mask.  */
50	/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */
51	l.ori	r6, r0, _NSIG8
52	l.addi	r5, r3, UCONTEXT_SIGMASK
53	l.ori	r4, r0, 0
54	l.ori	r3, r0, SIG_BLOCK
55	l.ori	r11, r0, SYS_ify (rt_sigprocmask)
56	/* Do the syscall.  */
57	l.sys	1
58	 l.nop
59
60	/* if -4096 < ret < 0 holds, it's an error */
61	l.sfgeui r11, 0xf001
62	l.bf	1f
63	 l.nop
64
65	l.jr	r9
66	 l.ori r11, r0, 0
67
681:	l.j	__syscall_error
69	 l.ori	r3, r11, 0
70
71END(__getcontext)
72weak_alias(__getcontext, getcontext)
73