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- /* Copyright (C) 2012 Free Software Foundation, Inc.
- 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)
- /* 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)
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