| /* Set current context. |
| |
| Copyright (C) 2009-2014 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" |
| #include "ucontext-internal.h" |
| |
| /* int setcontext (const ucontext_t *ucp) */ |
| |
| .text |
| |
| ENTRY(__setcontext) |
| |
| /* Create a signal frame on the stack: |
| |
| fp |
| lr |
| ... |
| sp-> rt_sigframe |
| */ |
| |
| stp x29, x30, [sp, -16]! |
| cfi_adjust_cfa_offset (16) |
| cfi_rel_offset (x29, 0) |
| cfi_rel_offset (x30, 8) |
| |
| mov x29, sp |
| cfi_def_cfa_register (x29) |
| |
| /* Allocate space for the sigcontext. */ |
| mov w3, #((RT_SIGFRAME_SIZE + SP_ALIGN_SIZE) & SP_ALIGN_MASK) |
| sub sp, sp, x3 |
| |
| /* Compute the base address of the ucontext structure. */ |
| add x1, sp, #RT_SIGFRAME_UCONTEXT |
| |
| /* Only ucontext is required in the frame, *copy* it in. */ |
| |
| #if UCONTEXT_SIZE % 16 |
| #error The implementation of setcontext.S assumes sizeof(ucontext_t) % 16 == 0 |
| #endif |
| |
| mov x2, #UCONTEXT_SIZE / 16 |
| 0: |
| ldp x3, x4, [x0], #16 |
| stp x3, x4, [x1], #16 |
| sub x2, x2, 1 |
| cbnz x2, 0b |
| |
| /* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe. */ |
| mov x8, SYS_ify (rt_sigreturn) |
| svc 0 |
| |
| /* Ooops we failed. Recover the stack */ |
| |
| mov sp, x29 |
| cfi_def_cfa_register (sp) |
| |
| ldp x29, x30, [sp], 16 |
| cfi_adjust_cfa_offset (16) |
| cfi_restore (x29) |
| cfi_restore (x30) |
| b C_SYMBOL_NAME(__syscall_error) |
| |
| PSEUDO_END (__setcontext) |
| weak_alias (__setcontext, setcontext) |
| |
| ENTRY(__startcontext) |
| mov x0, x19 |
| cbnz x0, __setcontext |
| 1: b HIDDEN_JUMPTARGET(_exit) |
| END(__startcontext) |
