242 lines
6.3 KiB
ArmAsm
242 lines
6.3 KiB
ArmAsm
/*
|
|
* linux/arch/m68knommu/platform/5307/entry.S
|
|
*
|
|
* Copyright (C) 1999-2007, Greg Ungerer (gerg@snapgear.com)
|
|
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
|
|
* Kenneth Albanowski <kjahds@kjahds.com>,
|
|
* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
|
|
* Copyright (C) 2004-2006 Macq Electronique SA. (www.macqel.com)
|
|
*
|
|
* Based on:
|
|
*
|
|
* linux/arch/m68k/kernel/entry.S
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file README.legal in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Linux/m68k support by Hamish Macdonald
|
|
*
|
|
* 68060 fixes by Jesper Skov
|
|
* ColdFire support by Greg Ungerer (gerg@snapgear.com)
|
|
* 5307 fixes by David W. Miller
|
|
* linux 2.4 support David McCullough <davidm@snapgear.com>
|
|
* Bug, speed and maintainability fixes by Philippe De Muyter <phdm@macqel.be>
|
|
*/
|
|
|
|
#include <linux/sys.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/entry.h>
|
|
|
|
.bss
|
|
|
|
sw_ksp:
|
|
.long 0
|
|
|
|
sw_usp:
|
|
.long 0
|
|
|
|
.text
|
|
|
|
.globl system_call
|
|
.globl resume
|
|
.globl ret_from_exception
|
|
.globl ret_from_signal
|
|
.globl sys_call_table
|
|
.globl ret_from_interrupt
|
|
.globl inthandler
|
|
.globl fasthandler
|
|
|
|
enosys:
|
|
mov.l #sys_ni_syscall,%d3
|
|
bra 1f
|
|
|
|
ENTRY(system_call)
|
|
SAVE_ALL
|
|
move #0x2000,%sr /* enable intrs again */
|
|
|
|
cmpl #NR_syscalls,%d0
|
|
jcc enosys
|
|
lea sys_call_table,%a0
|
|
lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */
|
|
movel %a0@(%d0),%d3
|
|
jeq enosys
|
|
|
|
1:
|
|
movel %sp,%d2 /* get thread_info pointer */
|
|
andl #-THREAD_SIZE,%d2 /* at start of kernel stack */
|
|
movel %d2,%a0
|
|
movel %a0@,%a1 /* save top of frame */
|
|
movel %sp,%a1@(TASK_THREAD+THREAD_ESP0)
|
|
btst #(TIF_SYSCALL_TRACE%8),%a0@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
|
|
bnes 1f
|
|
|
|
movel %d3,%a0
|
|
jbsr %a0@
|
|
movel %d0,%sp@(PT_OFF_D0) /* save the return value */
|
|
jra ret_from_exception
|
|
1:
|
|
movel #-ENOSYS,%d2 /* strace needs -ENOSYS in PT_OFF_D0 */
|
|
movel %d2,PT_OFF_D0(%sp) /* on syscall entry */
|
|
subql #4,%sp
|
|
SAVE_SWITCH_STACK
|
|
jbsr syscall_trace
|
|
RESTORE_SWITCH_STACK
|
|
addql #4,%sp
|
|
movel %d3,%a0
|
|
jbsr %a0@
|
|
movel %d0,%sp@(PT_OFF_D0) /* save the return value */
|
|
subql #4,%sp /* dummy return address */
|
|
SAVE_SWITCH_STACK
|
|
jbsr syscall_trace
|
|
|
|
ret_from_signal:
|
|
RESTORE_SWITCH_STACK
|
|
addql #4,%sp
|
|
|
|
ret_from_exception:
|
|
move #0x2700,%sr /* disable intrs */
|
|
btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel */
|
|
jeq Luser_return /* if so, skip resched, signals */
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
movel %sp,%d1 /* get thread_info pointer */
|
|
andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
|
|
movel %d1,%a0
|
|
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
|
|
andl #_TIF_NEED_RESCHED,%d1
|
|
jeq Lkernel_return
|
|
|
|
movel %a0@(TI_PREEMPTCOUNT),%d1
|
|
cmpl #0,%d1
|
|
jne Lkernel_return
|
|
|
|
pea Lkernel_return
|
|
jmp preempt_schedule_irq /* preempt the kernel */
|
|
#endif
|
|
|
|
Lkernel_return:
|
|
moveml %sp@,%d1-%d5/%a0-%a2
|
|
lea %sp@(32),%sp /* space for 8 regs */
|
|
movel %sp@+,%d0
|
|
addql #4,%sp /* orig d0 */
|
|
addl %sp@+,%sp /* stk adj */
|
|
rte
|
|
|
|
Luser_return:
|
|
movel %sp,%d1 /* get thread_info pointer */
|
|
andl #-THREAD_SIZE,%d1 /* at base of kernel stack */
|
|
movel %d1,%a0
|
|
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
|
|
andl #_TIF_WORK_MASK,%d1
|
|
jne Lwork_to_do /* still work to do */
|
|
|
|
Lreturn:
|
|
move #0x2700,%sr /* disable intrs */
|
|
movel sw_usp,%a0 /* get usp */
|
|
movel %sp@(PT_OFF_PC),%a0@- /* copy exception program counter */
|
|
movel %sp@(PT_OFF_FORMATVEC),%a0@- /* copy exception format/vector/sr */
|
|
moveml %sp@,%d1-%d5/%a0-%a2
|
|
lea %sp@(32),%sp /* space for 8 regs */
|
|
movel %sp@+,%d0
|
|
addql #4,%sp /* orig d0 */
|
|
addl %sp@+,%sp /* stk adj */
|
|
addql #8,%sp /* remove exception */
|
|
movel %sp,sw_ksp /* save ksp */
|
|
subql #8,sw_usp /* set exception */
|
|
movel sw_usp,%sp /* restore usp */
|
|
rte
|
|
|
|
Lwork_to_do:
|
|
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
|
|
move #0x2000,%sr /* enable intrs again */
|
|
btst #TIF_NEED_RESCHED,%d1
|
|
jne reschedule
|
|
|
|
/* GERG: do we need something here for TRACEing?? */
|
|
|
|
Lsignal_return:
|
|
subql #4,%sp /* dummy return address */
|
|
SAVE_SWITCH_STACK
|
|
pea %sp@(SWITCH_STACK_SIZE)
|
|
clrl %sp@-
|
|
jsr do_signal
|
|
addql #8,%sp
|
|
RESTORE_SWITCH_STACK
|
|
addql #4,%sp
|
|
jmp Lreturn
|
|
|
|
/*
|
|
* This is the generic interrupt handler (for all hardware interrupt
|
|
* sources). Calls upto high level code to do all the work.
|
|
*/
|
|
ENTRY(inthandler)
|
|
SAVE_ALL
|
|
moveq #-1,%d0
|
|
movel %d0,%sp@(PT_OFF_ORIG_D0)
|
|
|
|
movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */
|
|
andl #0x03fc,%d0 /* mask out vector only */
|
|
|
|
movel %sp,%sp@- /* push regs arg */
|
|
lsrl #2,%d0 /* calculate real vector # */
|
|
movel %d0,%sp@- /* push vector number */
|
|
jbsr do_IRQ /* call high level irq handler */
|
|
lea %sp@(8),%sp /* pop args off stack */
|
|
|
|
bra ret_from_interrupt /* this was fallthrough */
|
|
|
|
/*
|
|
* This is the fast interrupt handler (for certain hardware interrupt
|
|
* sources). Unlike the normal interrupt handler it just uses the
|
|
* current stack (doesn't care if it is user or kernel). It also
|
|
* doesn't bother doing the bottom half handlers.
|
|
*/
|
|
ENTRY(fasthandler)
|
|
SAVE_LOCAL
|
|
|
|
movew %sp@(PT_OFF_FORMATVEC),%d0
|
|
andl #0x03fc,%d0 /* mask out vector only */
|
|
|
|
movel %sp,%sp@- /* push regs arg */
|
|
lsrl #2,%d0 /* calculate real vector # */
|
|
movel %d0,%sp@- /* push vector number */
|
|
jbsr do_IRQ /* call high level irq handler */
|
|
lea %sp@(8),%sp /* pop args off stack */
|
|
|
|
RESTORE_LOCAL
|
|
|
|
ENTRY(ret_from_interrupt)
|
|
/* the fasthandler is confusing me, haven't seen any user */
|
|
jmp ret_from_exception
|
|
|
|
/*
|
|
* Beware - when entering resume, prev (the current task) is
|
|
* in a0, next (the new task) is in a1,so don't change these
|
|
* registers until their contents are no longer needed.
|
|
* This is always called in supervisor mode, so don't bother to save
|
|
* and restore sr; user's process sr is actually in the stack.
|
|
*/
|
|
ENTRY(resume)
|
|
movel %a0, %d1 /* get prev thread in d1 */
|
|
|
|
movel sw_usp,%d0 /* save usp */
|
|
movel %d0,%a0@(TASK_THREAD+THREAD_USP)
|
|
|
|
SAVE_SWITCH_STACK
|
|
movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */
|
|
movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */
|
|
RESTORE_SWITCH_STACK
|
|
|
|
movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore thread user stack */
|
|
movel %a0, sw_usp
|
|
rts
|