2015-01-02 16:28:19 +00:00
|
|
|
/* Copyright (C) 2012-2015 Free Software Foundation, Inc.
|
2012-03-05 22:58:13 +00:00
|
|
|
This file is part of the GNU C Library.
|
|
|
|
|
|
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
|
|
|
modify it under the terms of the GNU Lesser General Public
|
|
|
|
|
License as published by the Free Software Foundation; either
|
|
|
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
|
|
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
|
Lesser General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
|
|
|
License along with the GNU C Library; if not, see
|
|
|
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
|
|
|
|
#include <sysdep.h>
|
|
|
|
|
|
|
|
|
|
#include "ucontext_i.h"
|
|
|
|
|
|
|
|
|
|
.syntax unified
|
|
|
|
|
.text
|
|
|
|
|
|
|
|
|
|
/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
|
|
|
|
|
|
|
|
|
|
ENTRY(swapcontext)
|
|
|
|
|
|
|
|
|
|
/* Have getcontext() do most of the work then fix up
|
|
|
|
|
LR afterwards. Save R3 to keep the stack aligned. */
|
|
|
|
|
push {r0,r1,r3,r14}
|
|
|
|
|
cfi_adjust_cfa_offset (16)
|
|
|
|
|
cfi_rel_offset (r0,0)
|
|
|
|
|
cfi_rel_offset (r1,4)
|
|
|
|
|
cfi_rel_offset (r3,8)
|
|
|
|
|
cfi_rel_offset (r14,12)
|
|
|
|
|
|
|
|
|
|
bl __getcontext
|
|
|
|
|
mov r4, r0
|
|
|
|
|
|
|
|
|
|
pop {r0,r1,r3,r14}
|
|
|
|
|
cfi_adjust_cfa_offset (-16)
|
|
|
|
|
cfi_restore (r0)
|
|
|
|
|
cfi_restore (r1)
|
|
|
|
|
cfi_restore (r3)
|
|
|
|
|
cfi_restore (r14)
|
|
|
|
|
|
|
|
|
|
/* Exit if getcontext() failed. */
|
|
|
|
|
cmp r4, #0
|
|
|
|
|
itt ne
|
|
|
|
|
movne r0, r4
|
|
|
|
|
RETINSTR(ne, r14)
|
2013-06-05 20:26:40 +00:00
|
|
|
|
2012-03-05 22:58:13 +00:00
|
|
|
/* Fix up LR and the PC. */
|
|
|
|
|
str r13,[r0, #MCONTEXT_ARM_SP]
|
|
|
|
|
str r14,[r0, #MCONTEXT_ARM_LR]
|
|
|
|
|
str r14,[r0, #MCONTEXT_ARM_PC]
|
|
|
|
|
|
|
|
|
|
/* And swap using swapcontext(). */
|
|
|
|
|
mov r0, r1
|
|
|
|
|
b __setcontext
|
|
|
|
|
|
|
|
|
|
END(swapcontext)
|
