| /* Copyright (C) 2012-2014 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) |
