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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] - Blame information for rev 12

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Line No. Rev Author Line
1 12 alfik 
/*
2 
 *  linux/arch/m68knommu/platform/68328/entry.S
3 
 *
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 *  Copyright (C) 1991, 1992  Linus Torvalds
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 *
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 * This file is subject to the terms and conditions of the GNU General Public
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 * License.  See the file README.legal in the main directory of this archive
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 * for more details.
9 
 *
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 * Linux/m68k support by Hamish Macdonald
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 */
12 
 
13 
#include
14 
#include
15 
#include
16 
#include
17 
#include
18 
#include
19 
#include
20 
#include
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#include
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#include
23 
 
24 
.text
25 
 
26 
.globl system_call
27 
.globl resume
28 
.globl ret_from_exception
29 
.globl ret_from_signal
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.globl sys_call_table
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.globl ret_from_interrupt
32 
.globl bad_interrupt
33 
.globl inthandler1
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.globl inthandler2
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.globl inthandler3
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.globl inthandler4
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.globl inthandler5
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.globl inthandler6
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.globl inthandler7
40 
 
41 
.globl trap3
42 
.globl trap4
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.globl trap5
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.globl trap6
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.globl trap7
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.globl trap8
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.globl trap9
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.globl trap10
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50 
trap3:
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        move.b #0x33, (0xE0000000)
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        jmp trap
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trap4:
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        move.b #0x34, (0xE0000000)
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        jmp trap
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trap5:
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        move.b #0x35, (0xE0000000)
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        jmp trap
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trap6:
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        move.b #0x36, (0xE0000000)
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        jmp trap
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trap7:
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        move.b #0x37, (0xE0000000)
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        jmp trap
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trap8:
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        move.b #0x38, (0xE0000000)
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        jmp trap
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trap9:
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        move.b #0x39, (0xE0000000)
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        jmp trap
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trap10:
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        move.b #0x3A, (0xE0000000)
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        jmp trap
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badsys:
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        movel   #-ENOSYS,%sp@(PT_OFF_D0)
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        jra     ret_from_exception
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79 
do_trace:
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        movel   #-ENOSYS,%sp@(PT_OFF_D0)        /* needed for strace*/
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        subql   #4,%sp
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        SAVE_SWITCH_STACK
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        jbsr    syscall_trace
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        RESTORE_SWITCH_STACK
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        addql   #4,%sp
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        movel   %sp@(PT_OFF_ORIG_D0),%d1
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        movel   #-ENOSYS,%d0
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        cmpl    #NR_syscalls,%d1
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        jcc     1f
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        lsl     #2,%d1
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        lea     sys_call_table, %a0
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        jbsr    %a0@(%d1)
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94 
1:      movel   %d0,%sp@(PT_OFF_D0)             /* save the return value */
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        subql   #4,%sp                  /* dummy return address */
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        SAVE_SWITCH_STACK
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        jbsr    syscall_trace
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99 
ret_from_signal:
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        RESTORE_SWITCH_STACK
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        addql   #4,%sp
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        jra     ret_from_exception
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104 
ENTRY(system_call)
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        SAVE_ALL
106 
 
107 
        /* save top of frame*/
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        pea     %sp@
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        jbsr    set_esp0
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        addql   #4,%sp
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112 
        movel   %sp@(PT_OFF_ORIG_D0),%d0
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        movel   %sp,%d1                 /* get thread_info pointer */
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        andl    #-THREAD_SIZE,%d1
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        movel   %d1,%a2
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        btst    #TIF_SYSCALL_TRACE,%a2@(TI_FLAGS)
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        jne     do_trace
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        cmpl    #NR_syscalls,%d0
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        jcc     badsys
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        lsl     #2,%d0
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        lea     sys_call_table,%a0
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        movel   %a0@(%d0), %a0
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        jbsr    %a0@
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        movel   %d0,%sp@(PT_OFF_D0)             /* save the return value*/
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ret_from_exception:
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        btst    #5,%sp@(PT_OFF_SR)              /* check if returning to kernel*/
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        jeq     Luser_return            /* if so, skip resched, signals*/
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Lkernel_return:
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        RESTORE_ALL
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Luser_return:
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        /* only allow interrupts when we are really the last one on the*/
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        /* kernel stack, otherwise stack overflow can occur during*/
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        /* heavy interrupt load*/
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        andw    #ALLOWINT,%sr
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        movel   %sp,%d1                 /* get thread_info pointer */
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        andl    #-THREAD_SIZE,%d1
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        movel   %d1,%a2
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        move    %a2@(TI_FLAGS),%d1      /* thread_info->flags */
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        andl    #_TIF_WORK_MASK,%d1
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        jne     Lwork_to_do
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        RESTORE_ALL
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148 
Lwork_to_do:
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        movel   %a2@(TI_FLAGS),%d1      /* thread_info->flags */
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        btst    #TIF_NEED_RESCHED,%d1
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        jne     reschedule
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153 
Lsignal_return:
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        subql   #4,%sp                  /* dummy return address*/
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        SAVE_SWITCH_STACK
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        pea     %sp@(SWITCH_STACK_SIZE)
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        clrl    %sp@-
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        bsrw    do_signal
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        addql   #8,%sp
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        RESTORE_SWITCH_STACK
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        addql   #4,%sp
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Lreturn:
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        RESTORE_ALL
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165 
/*
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 * This is the main interrupt handler, responsible for calling process_int()
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 */
168 
inthandler1:
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        SAVE_ALL
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        movew   %sp@(PT_OFF_VECTOR), %d0
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        and     #0x3ff, %d0
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        movel   %sp,%sp@-
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        movel   #1,%sp@-                /*  put vector # on stack*/
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        jbsr    process_int             /*  process the IRQ*/
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3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
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179 
inthandler2:
180 
        SAVE_ALL
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        movew   %sp@(PT_OFF_VECTOR), %d0
182 
        and     #0x3ff, %d0
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184 
        movel   %sp,%sp@-
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        movel   #2,%sp@-                /*  put vector # on stack*/
186 
        jbsr    process_int             /*  process the IRQ*/
187 
3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
189 
 
190 
inthandler3:
191 
        SAVE_ALL
192 
        movew   %sp@(PT_OFF_VECTOR), %d0
193 
        and     #0x3ff, %d0
194 
 
195 
        movel   %sp,%sp@-
196 
        movel   #3,%sp@-                /*  put vector # on stack*/
197 
        jbsr    process_int             /*  process the IRQ*/
198 
3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
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201 
inthandler4:
202 
        SAVE_ALL
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        movew   %sp@(PT_OFF_VECTOR), %d0
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        and     #0x3ff, %d0
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206 
        movel   %sp,%sp@-
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        movel   #4,%sp@-                /*  put vector # on stack*/
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        jbsr    process_int             /*  process the IRQ*/
209 
3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
211 
 
212 
inthandler5:
213 
        SAVE_ALL
214 
        movew   %sp@(PT_OFF_VECTOR), %d0
215 
        and     #0x3ff, %d0
216 
 
217 
        movel   %sp,%sp@-
218 
        movel   #5,%sp@-                /*  put vector # on stack*/
219 
        jbsr    process_int             /*  process the IRQ*/
220 
3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
222 
 
223 
inthandler6:
224 
        SAVE_ALL
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        movew   %sp@(PT_OFF_VECTOR), %d0
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        and     #0x3ff, %d0
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228 
        movel   %sp,%sp@-
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        movel   #6,%sp@-                /*  put vector # on stack*/
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        jbsr    process_int             /*  process the IRQ*/
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3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
233 
 
234 
inthandler7:
235 
        SAVE_ALL
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        movew   %sp@(PT_OFF_VECTOR), %d0
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        and     #0x3ff, %d0
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239 
        movel   %sp,%sp@-
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        movel   #7,%sp@-                /*  put vector # on stack*/
241 
        jbsr    process_int             /*  process the IRQ*/
242 
3:      addql   #8,%sp                  /*  pop parameters off stack*/
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        bra     ret_from_interrupt
244 
 
245 
inthandler:
246 
        SAVE_ALL
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        movew   %sp@(PT_OFF_VECTOR), %d0
248 
        and     #0x3ff, %d0
249 
 
250 
        movel   %sp,%sp@-
251 
        movel   %d0,%sp@-               /*  put vector # on stack*/
252 
        jbsr    process_int             /*  process the IRQ*/
253 
3:      addql   #8,%sp                  /*  pop parameters off stack*/
254 
        bra     ret_from_interrupt
255 
 
256 
ret_from_interrupt:
257 
        /*jeq   1f*/
258 
2:
259 
        RESTORE_ALL
260 
 
261 
        /*ALIGN*/
262 
1:
263 
        moveb   %sp@(PT_OFF_SR), %d0
264 
        and     #7, %d0
265 
        jhi     2b
266 
 
267 
        /* check if we need to do software interrupts */
268 
        /*tst.l irq_stat+CPUSTAT_SOFTIRQ_PENDING*/
269 
        jeq     ret_from_exception
270 
 
271 
        pea     ret_from_exception
272 
        jra     do_softirq
273 
 
274 
 
275 
/*
276 
 * Handler for uninitialized and spurious interrupts.
277 
 */
278 
ENTRY(bad_interrupt)
279 
        addql   #1,num_spurious
280 
        rte
281 
 
282 
/*
283 
 * Beware - when entering resume, prev (the current task) is
284 
 * in a0, next (the new task) is in a1,so don't change these
285 
 * registers until their contents are no longer needed.
286 
 */
287 
ENTRY(resume)
288 
        movel   %a0,%d1                         /* save prev thread in d1 */
289 
        movew   %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */
290 
        movel   %usp,%a2                        /* save usp */
291 
        movel   %a2,%a0@(TASK_THREAD+THREAD_USP)
292 
 
293 
        SAVE_SWITCH_STACK
294 
        movel   %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */
295 
        movel   %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */
296 
        RESTORE_SWITCH_STACK
297 
 
298 
        movel   %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */
299 
        movel   %a0,%usp
300 
        movew   %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */
301 
        rts
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