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/* 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)
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