2cfebf2bce
Possible RETS Register Corruption when Subroutine Is under 5 Cycles in Duration Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
107 lines
2.1 KiB
ArmAsm
107 lines
2.1 KiB
ArmAsm
/*
|
|
* File: arch/blackfin/kernel/entry.S
|
|
* Based on:
|
|
* Author:
|
|
*
|
|
* Created:
|
|
* Description:
|
|
*
|
|
* Modified:
|
|
* Copyright 2004-2006 Analog Devices Inc.
|
|
*
|
|
* Bugs: Enter bugs at http://blackfin.uclinux.org/
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see the file COPYING, or write
|
|
* to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#include <asm/mach-common/context.S>
|
|
|
|
#ifdef CONFIG_EXCPT_IRQ_SYSC_L1
|
|
.section .l1.text
|
|
#else
|
|
.text
|
|
#endif
|
|
|
|
ENTRY(_ret_from_fork)
|
|
SP += -12;
|
|
call _schedule_tail;
|
|
SP += 12;
|
|
r0 = [sp + PT_IPEND];
|
|
cc = bittst(r0,1);
|
|
if cc jump .Lin_kernel;
|
|
RESTORE_CONTEXT
|
|
rti;
|
|
.Lin_kernel:
|
|
bitclr(r0,1);
|
|
[sp + PT_IPEND] = r0;
|
|
/* do a 'fake' RTI by jumping to [RETI]
|
|
* to avoid clearing supervisor mode in child
|
|
*/
|
|
r0 = [sp + PT_PC];
|
|
[sp + PT_P0] = r0;
|
|
|
|
RESTORE_ALL_SYS
|
|
jump (p0);
|
|
ENDPROC(_ret_from_fork)
|
|
|
|
ENTRY(_sys_fork)
|
|
r0 = -EINVAL;
|
|
#if (ANOMALY_05000371)
|
|
nop;
|
|
nop;
|
|
nop;
|
|
#endif
|
|
rts;
|
|
ENDPROC(_sys_fork)
|
|
|
|
ENTRY(_sys_vfork)
|
|
r0 = sp;
|
|
r0 += 24;
|
|
[--sp] = rets;
|
|
SP += -12;
|
|
call _bfin_vfork;
|
|
SP += 12;
|
|
rets = [sp++];
|
|
rts;
|
|
ENDPROC(_sys_vfork)
|
|
|
|
ENTRY(_sys_clone)
|
|
r0 = sp;
|
|
r0 += 24;
|
|
[--sp] = rets;
|
|
SP += -12;
|
|
call _bfin_clone;
|
|
SP += 12;
|
|
rets = [sp++];
|
|
rts;
|
|
ENDPROC(_sys_clone)
|
|
|
|
ENTRY(_sys_rt_sigreturn)
|
|
r0 = sp;
|
|
r0 += 24;
|
|
[--sp] = rets;
|
|
SP += -12;
|
|
call _do_rt_sigreturn;
|
|
SP += 12;
|
|
rets = [sp++];
|
|
rts;
|
|
ENDPROC(_sys_rt_sigreturn)
|