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[/] [ao68000/] [trunk/] [tests/] [soc_for_linux_on_terasic_de2_70/] [software/] [linux-2.6.33.1-ao68000/] [arch/] [m68knommu/] [platform/] [ao68000/] [entry.S] - Rev 12
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/*
* linux/arch/m68knommu/platform/68328/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
*/
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/traps.h>
#include <asm/asm-offsets.h>
#include <asm/entry.h>
.text
.globl system_call
.globl resume
.globl ret_from_exception
.globl ret_from_signal
.globl sys_call_table
.globl ret_from_interrupt
.globl bad_interrupt
.globl inthandler1
.globl inthandler2
.globl inthandler3
.globl inthandler4
.globl inthandler5
.globl inthandler6
.globl inthandler7
.globl trap3
.globl trap4
.globl trap5
.globl trap6
.globl trap7
.globl trap8
.globl trap9
.globl trap10
trap3:
move.b #0x33, (0xE0000000)
jmp trap
trap4:
move.b #0x34, (0xE0000000)
jmp trap
trap5:
move.b #0x35, (0xE0000000)
jmp trap
trap6:
move.b #0x36, (0xE0000000)
jmp trap
trap7:
move.b #0x37, (0xE0000000)
jmp trap
trap8:
move.b #0x38, (0xE0000000)
jmp trap
trap9:
move.b #0x39, (0xE0000000)
jmp trap
trap10:
move.b #0x3A, (0xE0000000)
jmp trap
badsys:
movel #-ENOSYS,%sp@(PT_OFF_D0)
jra ret_from_exception
do_trace:
movel #-ENOSYS,%sp@(PT_OFF_D0) /* needed for strace*/
subql #4,%sp
SAVE_SWITCH_STACK
jbsr syscall_trace
RESTORE_SWITCH_STACK
addql #4,%sp
movel %sp@(PT_OFF_ORIG_D0),%d1
movel #-ENOSYS,%d0
cmpl #NR_syscalls,%d1
jcc 1f
lsl #2,%d1
lea sys_call_table, %a0
jbsr %a0@(%d1)
1: 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
jra ret_from_exception
ENTRY(system_call)
SAVE_ALL
/* save top of frame*/
pea %sp@
jbsr set_esp0
addql #4,%sp
movel %sp@(PT_OFF_ORIG_D0),%d0
movel %sp,%d1 /* get thread_info pointer */
andl #-THREAD_SIZE,%d1
movel %d1,%a2
btst #TIF_SYSCALL_TRACE,%a2@(TI_FLAGS)
jne do_trace
cmpl #NR_syscalls,%d0
jcc badsys
lsl #2,%d0
lea sys_call_table,%a0
movel %a0@(%d0), %a0
jbsr %a0@
movel %d0,%sp@(PT_OFF_D0) /* save the return value*/
ret_from_exception:
btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel*/
jeq Luser_return /* if so, skip resched, signals*/
Lkernel_return:
RESTORE_ALL
Luser_return:
/* only allow interrupts when we are really the last one on the*/
/* kernel stack, otherwise stack overflow can occur during*/
/* heavy interrupt load*/
andw #ALLOWINT,%sr
movel %sp,%d1 /* get thread_info pointer */
andl #-THREAD_SIZE,%d1
movel %d1,%a2
move %a2@(TI_FLAGS),%d1 /* thread_info->flags */
andl #_TIF_WORK_MASK,%d1
jne Lwork_to_do
RESTORE_ALL
Lwork_to_do:
movel %a2@(TI_FLAGS),%d1 /* thread_info->flags */
btst #TIF_NEED_RESCHED,%d1
jne reschedule
Lsignal_return:
subql #4,%sp /* dummy return address*/
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
clrl %sp@-
bsrw do_signal
addql #8,%sp
RESTORE_SWITCH_STACK
addql #4,%sp
Lreturn:
RESTORE_ALL
/*
* This is the main interrupt handler, responsible for calling process_int()
*/
inthandler1:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #1,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler2:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #2,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler3:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #3,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler4:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #4,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler5:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #5,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler6:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #6,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler7:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel #7,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
inthandler:
SAVE_ALL
movew %sp@(PT_OFF_VECTOR), %d0
and #0x3ff, %d0
movel %sp,%sp@-
movel %d0,%sp@- /* put vector # on stack*/
jbsr process_int /* process the IRQ*/
3: addql #8,%sp /* pop parameters off stack*/
bra ret_from_interrupt
ret_from_interrupt:
/*jeq 1f*/
2:
RESTORE_ALL
/*ALIGN*/
1:
moveb %sp@(PT_OFF_SR), %d0
and #7, %d0
jhi 2b
/* check if we need to do software interrupts */
/*tst.l irq_stat+CPUSTAT_SOFTIRQ_PENDING*/
jeq ret_from_exception
pea ret_from_exception
jra do_softirq
/*
* Handler for uninitialized and spurious interrupts.
*/
ENTRY(bad_interrupt)
addql #1,num_spurious
rte
/*
* 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.
*/
ENTRY(resume)
movel %a0,%d1 /* save prev thread in d1 */
movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */
movel %usp,%a2 /* save usp */
movel %a2,%a0@(TASK_THREAD+THREAD_USP)
SAVE_SWITCH_STACK
movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */
movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */
RESTORE_SWITCH_STACK
movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */
movel %a0,%usp
movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */
rts