mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
90 lines
2.2 KiB
ArmAsm
90 lines
2.2 KiB
ArmAsm
/* Set current context.
|
|
|
|
Copyright (C) 2009-2013 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)
|