| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. |
| |
| 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" |
| |
| /* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ |
| |
| .text |
| ENTRY (__swapcontext) |
| FEEDBACK_ENTER(__swapcontext) |
| /* Set up a frame and save r0 and r1. */ |
| { |
| ST sp, lr |
| ADDI_PTR r11, sp, -(3 * REGSIZE) |
| move r10, sp |
| } |
| ADDI_PTR sp, sp, -(4 * REGSIZE) |
| cfi_def_cfa_offset (4 * REGSIZE) |
| cfi_offset (lr, 0) |
| { |
| ST r11, r10 |
| ADDI_PTR r10, sp, (2 * REGSIZE) |
| } |
| { |
| ST r10, r0 |
| ADDI_PTR r10, sp, (3 * REGSIZE) |
| } |
| ST r10, r1 |
| |
| /* Save the current context. */ |
| jal __getcontext |
| |
| /* Tear down the frame and restore r0, r1, and lr. */ |
| { |
| BNEZ r0, .Lerror |
| ADDI_PTR r1, sp, 3 * REGSIZE |
| } |
| { |
| LD r1, r1 |
| ADDI_PTR r0, sp, 2 * REGSIZE |
| } |
| { |
| LD r0, r0 |
| ADDI_PTR sp, sp, 4 * REGSIZE |
| } |
| cfi_def_cfa_offset (0) |
| { |
| LD lr, sp |
| ADDLI_PTR r10, r0, UC_REG(54) |
| } |
| |
| /* Update the stored sp and lr. */ |
| { |
| ST r10, sp |
| ADDLI_PTR r10, r0, UC_REG(55) |
| } |
| ST r10, lr |
| |
| /* Tail-call setcontext to finish up. */ |
| { |
| move r0, r1 |
| j __setcontext |
| } |
| |
| .Lerror: |
| ADDI_PTR sp, sp, 4 * REGSIZE |
| cfi_def_cfa_offset (0) |
| LD lr, sp |
| jrp lr |
| END (__swapcontext) |
| |
| weak_alias (__swapcontext, swapcontext) |
