1/* Save current context.
2   Copyright (C) 2008-2021 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 *ucp)
24
25  Saves the machine context in UCP such that when it is activated,
26  it appears as if __getcontext() returned again.
27
28  This implementation is intended to be used for *synchronous* context
29  switches only.  Therefore, it does not have to save anything
30  other than the PRESERVED state.  */
31
32
33ENTRY(__getcontext)
34	save	%sp, -112, %sp
35	st	%g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PSR]
36
37	/* In reality, we only use the GREG_PC value when setting
38	   or swapping contexts.  But we fill in NPC for completeness.  */
39	add	%i7, 8, %o0
40	st	%o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_PC]
41	add	%o0, 4, %o0
42	st	%o0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_NPC]
43
44	rd	%y, %o1
45	st	%o1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_Y]
46
47	st	%g1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G1]
48	st	%g2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G2]
49	st	%g3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G3]
50	st	%g4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G4]
51	st	%g5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G5]
52	st	%g6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G6]
53	st	%g7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_G7]
54
55	mov	SIG_BLOCK, %o0
56	clr	%o1
57	add	%i0, UC_SIGMASK, %o2
58	mov	8, %o3
59	mov	__NR_rt_sigprocmask, %g1
60	ta	0x10
61
62	/* Zero, success, return value.  */
63	st	%g0, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O0]
64	st	%i1, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O1]
65	st	%i2, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O2]
66	st	%i3, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O3]
67	st	%i4, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O4]
68	st	%i5, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O5]
69	st	%i6, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O6]
70	st	%i7, [%i0 + UC_MCONTEXT + MC_GREGS + GREG_O7]
71
72	st	%g0, [%i0 + UC_MCONTEXT + MC_GWINS]
73
74	/* Do not save FPU state, it is volatile across calls.  */
75	stb	%g0, [%i0 + UC_MCONTEXT + MC_FPREGS + FPU_EN]
76
77	st	%g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_ID]
78	st	%g0, [%i0 + UC_MCONTEXT + MC_XRS + XRS_PTR]
79	jmpl	%i7 + 8, %g0
80	 restore %g0, %g0, %o0
81END(__getcontext)
82
83weak_alias (__getcontext, getcontext)
84