+++ /dev/null
-/*
- * 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
-
-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_enter
- 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_leave
-
-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%8),%a2@(TI_FLAGS+(31-TIF_SYSCALL_TRACE)/8)
- 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
-1:
- move %a2@(TI_FLAGS),%d1 /* thread_info->flags */
- 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)
- bsrw do_signal
- addql #4,%sp
- RESTORE_SWITCH_STACK
- addql #4,%sp
- jra 1b
-
-/*
- * This is the main interrupt handler, responsible for calling process_int()
- */
-inthandler1:
- SAVE_ALL
- movew %sp@(PT_OFF_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #65,%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_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #66,%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_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #67,%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_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #68,%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_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #69,%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_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #70,%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_FORMATVEC), %d0
- and #0x3ff, %d0
-
- movel %sp,%sp@-
- movel #71,%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_FORMATVEC), %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
-1:
- moveb %sp@(PT_OFF_SR), %d0
- and #7, %d0
- jhi 2b
-
- /* check if we need to do software interrupts */
- 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
-
git.samba.org / sfrench / cifs-2.6.git / blobdiff