1 /* Copyright (C) 2012-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
18 /* ??? Needs more rearrangement for the LDM to handle thumb mode. */
21 #include <rtld-global-offsets.h>
23 #include "ucontext_i.h"
28 /* int setcontext (const ucontext_t *ucp) */
32 add r0, r0, #UCONTEXT_REGSPACE
34 /* Restore the VFP registers. Copied from arm/__longjmp.S. */
37 ldr r1, .Lrtld_global_ro
40 ldr r2, [r2, #RTLD_GLOBAL_RO_DL_HWCAP_OFFSET]
47 tst r2, #HWCAP_ARM_VFP
51 /* Following instruction is vldmia r0!, {d8-d15}. */
52 ldc p11, cr8, [r0], #64
53 /* Restore the floating-point status register. */
55 /* Following instruction is fmxr fpscr, r1. */
56 mcr p10, 7, r1, cr1, cr0, 0
58 tst r2, #HWCAP_ARM_IWMMXT
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
71 /* Now bring back the signal status. */
73 add r1, r4, #UCONTEXT_SIGMASK
75 bl PLTJMP(__sigprocmask)
77 /* Loading r0-r3 makes makecontext easier. */
78 add r14, r4, #MCONTEXT_ARM_R0
80 ldr r13, [r14, #(MCONTEXT_ARM_SP - MCONTEXT_ARM_R0)]
81 add r14, r14, #(MCONTEXT_ARM_LR - MCONTEXT_ARM_R0)
85 weak_alias(__setcontext, setcontext)
87 /* Called when a makecontext() context returns. Start the
88 context in R4 or fall through to exit(). */
91 bne PLTJMP(__setcontext)
93 @ New context was 0 - exit
94 b PLTJMP(HIDDEN_JUMPTARGET(_exit))
98 1: .long _GLOBAL_OFFSET_TABLE_ - 0b - PC_OFS
100 .long C_SYMBOL_NAME(_rtld_global_ro)(GOT)
103 .long C_SYMBOL_NAME(_dl_hwcap)