mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
73 lines
1.8 KiB
ArmAsm
73 lines
1.8 KiB
ArmAsm
/* Swap to new context.
|
|
Copyright (C) 2008-2025 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
#include "ucontext_i.h"
|
|
|
|
.text
|
|
ENTRY(__swapcontext)
|
|
|
|
/* Copy rp to ret0 (r28). */
|
|
copy %rp,%ret0
|
|
|
|
/* Create a frame. */
|
|
ldo 64(%sp),%sp
|
|
.cfi_def_cfa_offset -64
|
|
|
|
/* Save the current machine context to oucp. */
|
|
bl __getcontext,%rp
|
|
|
|
/* Copy oucp to register ret1 (r29). __getcontext saves and
|
|
restores it on a normal return. It is restored from oR29
|
|
on reactivation. */
|
|
copy %r26,%ret1
|
|
|
|
/* Pop frame. */
|
|
ldo -64(%sp),%sp
|
|
.cfi_def_cfa_offset 0
|
|
|
|
/* Load return pointer from oR28. */
|
|
ldw oR28(%ret1),%rp
|
|
|
|
/* Return if error. */
|
|
or,= %r0,%ret0,%r0
|
|
bv,n %r0(%rp)
|
|
|
|
/* Load sc_sar flag. */
|
|
ldb oSAR(%ret1),%r20
|
|
|
|
/* Return if oucp context has been reactivated. */
|
|
or,= %r0,%r20,%r0
|
|
bv,n %r0(%rp)
|
|
|
|
/* Mark sc_sar flag. */
|
|
ldi 1,%r20
|
|
stb %r20,oSAR(%ret1)
|
|
|
|
/* Activate the machine context in ucp. */
|
|
bl __setcontext,%rp
|
|
ldw oR25(%ret1),%r26
|
|
|
|
/* Load return pointer. */
|
|
ldw oR28(%ret1),%rp
|
|
bv,n %r0(%rp)
|
|
|
|
END(__swapcontext)
|
|
|
|
weak_alias (__swapcontext, swapcontext)
|