1/* Copyright (C) 2012-2021 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#include <sysdep.h>
19#include <rtld-global-offsets.h>
20
21#include "ucontext_i.h"
22
23	.syntax unified
24	.text
25
26/* int getcontext (ucontext_t *ucp) */
27
28ENTRY(__getcontext)
29	/* No need to save r0-r3, d0-d7, or d16-d31.  */
30	add	r1, r0, #MCONTEXT_ARM_R4
31	stmia   r1, {r4-r11}
32
33	/* Save R13 separately as Thumb can't STM it.  */
34	str     r13, [r0, #MCONTEXT_ARM_SP]
35	str     r14, [r0, #MCONTEXT_ARM_LR]
36	/* Return to LR */
37	str     r14, [r0, #MCONTEXT_ARM_PC]
38	/* Return zero */
39	mov     r2, #0
40	str     r2, [r0, #MCONTEXT_ARM_R0]
41
42	/* Save ucontext_t * across the next call.  */
43	mov	r4, r0
44
45	/* __sigprocmask(SIG_BLOCK, NULL, &(ucontext->uc_sigmask)) */
46	mov     r0, #SIG_BLOCK
47	mov     r1, #0
48	add     r2, r4, #UCONTEXT_SIGMASK
49	bl      PLTJMP(__sigprocmask)
50
51	/* Store FP regs.  Much of the FP code is copied from arm/setjmp.S.  */
52
53#ifdef SHARED
54	ldr     r2, 1f
55	ldr     r1, .Lrtld_global_ro
560:      add     r2, pc, r2
57	ldr     r2, [r2, r1]
58	ldr     r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
59#else
60	ldr     r2, .Lhwcap
61	ldr     r2, [r2, #0]
62#endif
63
64	add	r0, r4, #UCONTEXT_REGSPACE
65
66#ifdef __SOFTFP__
67	tst     r2, #HWCAP_ARM_VFP
68	beq     .Lno_vfp
69#endif
70
71	/* Store the VFP registers.
72	   Don't use VFP instructions directly because this code
73	   is used in non-VFP multilibs.  */
74	/* Following instruction is vstmia r0!, {d8-d15}.  */
75	stc     p11, cr8, [r0], #64
76	/* Store the floating-point status register.  */
77	/* Following instruction is vmrs r1, fpscr.  */
78	mrc     p10, 7, r1, cr1, cr0, 0
79	str     r1, [r0], #4
80.Lno_vfp:
81
82	tst     r2, #HWCAP_ARM_IWMMXT
83	beq     .Lno_iwmmxt
84
85	/* Save the call-preserved iWMMXt registers.  */
86	/* Following instructions are wstrd wr10, [r0], #8 (etc.)  */
87	stcl    p1, cr10, [r0], #8
88	stcl    p1, cr11, [r0], #8
89	stcl    p1, cr12, [r0], #8
90	stcl    p1, cr13, [r0], #8
91	stcl    p1, cr14, [r0], #8
92	stcl    p1, cr15, [r0], #8
93.Lno_iwmmxt:
94
95	/* Restore the clobbered R4 and LR.  */
96	ldr	r14, [r4, #MCONTEXT_ARM_LR]
97	ldr	r4, [r4, #MCONTEXT_ARM_R4]
98
99	mov	r0, #0
100
101	DO_RET(r14)
102
103END(__getcontext)
104
105#ifdef SHARED
1061:      .long   _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
107.Lrtld_global_ro:
108	.long   C_SYMBOL_NAME(_rtld_global_ro)(GOT)
109#else
110.Lhwcap:
111	.long   C_SYMBOL_NAME(_dl_hwcap)
112#endif
113
114
115weak_alias(__getcontext, getcontext)
116