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1/* Copyright (C) 2012-2019 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 <http://www.gnu.org/licenses/>. */
17
18/* ??? Needs more rearrangement for the LDM to handle thumb mode. */
19#define NO_THUMB
20#include <sysdep.h>
21#include <rtld-global-offsets.h>
22
23#include "ucontext_i.h"
24
25 .syntax unified
26 .text
27
28/* int setcontext (const ucontext_t *ucp) */
29
30ENTRY(__setcontext)
31 mov r4, r0
32 add r0, r0, #UCONTEXT_REGSPACE
33
34 /* Restore the VFP registers. Copied from arm/__longjmp.S. */
35#ifdef PIC
36 ldr r2, 1f
37 ldr r1, .Lrtld_global_ro
380: add r2, pc, r2
39 ldr r2, [r2, r1]
40 ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
41#else
42 ldr r2, .Lhwcap
43 ldr r2, [r2, #0]
44#endif
45
46#ifdef __SOFTFP__
47 tst r2, #HWCAP_ARM_VFP
48 beq .Lno_vfp_sc
49#endif
50
51 /* Following instruction is vldmia r0!, {d8-d15}. */
52 ldc p11, cr8, [r0], #64
53 /* Restore the floating-point status register. */
54 ldr r1, [r0], #4
55 /* Following instruction is fmxr fpscr, r1. */
56 mcr p10, 7, r1, cr1, cr0, 0
57.Lno_vfp_sc:
58 tst r2, #HWCAP_ARM_IWMMXT
59 beq .Lno_iwmmxt_sc
60
61 /* Restore the call-preserved iWMMXt registers. */
62 /* Following instructions are wldrd wr10, [r0], #8 (etc.) */
63 ldcl p1, cr10, [r0], #8
64 ldcl p1, cr11, [r0], #8
65 ldcl p1, cr12, [r0], #8
66 ldcl p1, cr13, [r0], #8
67 ldcl p1, cr14, [r0], #8
68 ldcl p1, cr15, [r0], #8
69.Lno_iwmmxt_sc:
70
71 /* Now bring back the signal status. */
72 mov r0, #SIG_SETMASK
73 add r1, r4, #UCONTEXT_SIGMASK
74 mov r2, #0
75 bl PLTJMP(__sigprocmask)
76
77 /* Loading r0-r3 makes makecontext easier. */
78 add r14, r4, #MCONTEXT_ARM_R0
79 ldmia r14, {r0-r12}
80 ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
81 add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
82 ldmia r14, {r14, pc}
83
84END(setcontext)
85weak_alias(__setcontext, setcontext)
86
87 /* Called when a makecontext() context returns. Start the
88 context in R4 or fall through to exit(). */
89 /* Unwind descriptors are looked up based on PC - 2, so we have to
90 make sure to mark the instruction preceding the __startcontext
91 label as .cantunwind. */
92 .fnstart
93 .cantunwind
94 nop
95ENTRY(__startcontext)
96 movs r0, r4
97 bne PLTJMP(__setcontext)
98
99 @ New context was 0 - exit
100 b PLTJMP(HIDDEN_JUMPTARGET(exit))
101 .fnend
102END(__startcontext)
103
104#ifdef PIC
1051: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
106.Lrtld_global_ro:
107 .long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
108#else
109.Lhwcap:
110 .long C_SYMBOL_NAME(_dl_hwcap)
111#endif
112

Warning: That file was not part of the compilation database. It may have many parsing errors.