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1/* -*- mode: asm -*-
2 *
3 * linux/arch/m68k/kernel/entry.S
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file README.legal in the main directory of this archive
9 * for more details.
10 *
11 * Linux/m68k support by Hamish Macdonald
12 *
13 * 68060 fixes by Jesper Skov
14 *
15 */
16
17/*
18 * entry.S contains the system-call and fault low-level handling routines.
19 * This also contains the timer-interrupt handler, as well as all interrupts
20 * and faults that can result in a task-switch.
21 *
22 * NOTE: This code handles signal-recognition, which happens every time
23 * after a timer-interrupt and after each system call.
24 *
25 */
26
27/*
28 * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
29 * all pointers that used to be 'current' are now entry
30 * number 0 in the 'current_set' list.
31 *
32 * 6/05/00 RZ: addedd writeback completion after return from sighandler
33 * for 68040
34 */
35
36#include <linux/linkage.h>
37#include <asm/errno.h>
38#include <asm/setup.h>
39#include <asm/segment.h>
40#include <asm/traps.h>
41#include <asm/unistd.h>
42#include <asm/asm-offsets.h>
43#include <asm/entry.h>
44
45.globl system_call, buserr, trap, resume
46.globl sys_call_table
47.globl __sys_fork, __sys_clone, __sys_vfork
48.globl bad_interrupt
49.globl auto_irqhandler_fixup
50.globl user_irqvec_fixup
51
52.text
53ENTRY(__sys_fork)
54 SAVE_SWITCH_STACK
55 jbsr sys_fork
56 lea %sp@(24),%sp
57 rts
58
59ENTRY(__sys_clone)
60 SAVE_SWITCH_STACK
61 pea %sp@(SWITCH_STACK_SIZE)
62 jbsr m68k_clone
63 lea %sp@(28),%sp
64 rts
65
66ENTRY(__sys_vfork)
67 SAVE_SWITCH_STACK
68 jbsr sys_vfork
69 lea %sp@(24),%sp
70 rts
71
72ENTRY(__sys_clone3)
73 SAVE_SWITCH_STACK
74 pea %sp@(SWITCH_STACK_SIZE)
75 jbsr m68k_clone3
76 lea %sp@(28),%sp
77 rts
78
79ENTRY(sys_sigreturn)
80 SAVE_SWITCH_STACK
81 movel %sp,%sp@- | switch_stack pointer
82 pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
83 jbsr do_sigreturn
84 addql #8,%sp
85 RESTORE_SWITCH_STACK
86 rts
87
88ENTRY(sys_rt_sigreturn)
89 SAVE_SWITCH_STACK
90 movel %sp,%sp@- | switch_stack pointer
91 pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
92 jbsr do_rt_sigreturn
93 addql #8,%sp
94 RESTORE_SWITCH_STACK
95 rts
96
97ENTRY(buserr)
98 SAVE_ALL_INT
99 GET_CURRENT(%d0)
100 movel %sp,%sp@- | stack frame pointer argument
101 jbsr buserr_c
102 addql #4,%sp
103 jra ret_from_exception
104
105ENTRY(trap)
106 SAVE_ALL_INT
107 GET_CURRENT(%d0)
108 movel %sp,%sp@- | stack frame pointer argument
109 jbsr trap_c
110 addql #4,%sp
111 jra ret_from_exception
112
113 | After a fork we jump here directly from resume,
114 | so that %d1 contains the previous task
115 | schedule_tail now used regardless of CONFIG_SMP
116ENTRY(ret_from_fork)
117 movel %d1,%sp@-
118 jsr schedule_tail
119 addql #4,%sp
120 jra ret_from_exception
121
122ENTRY(ret_from_kernel_thread)
123 | a3 contains the kernel thread payload, d7 - its argument
124 movel %d1,%sp@-
125 jsr schedule_tail
126 movel %d7,(%sp)
127 jsr %a3@
128 addql #4,%sp
129 jra ret_from_exception
130
131#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
132
133#ifdef TRAP_DBG_INTERRUPT
134
135.globl dbginterrupt
136ENTRY(dbginterrupt)
137 SAVE_ALL_INT
138 GET_CURRENT(%d0)
139 movel %sp,%sp@- /* stack frame pointer argument */
140 jsr dbginterrupt_c
141 addql #4,%sp
142 jra ret_from_exception
143#endif
144
145ENTRY(reschedule)
146 /* save top of frame */
147 pea %sp@
148 jbsr set_esp0
149 addql #4,%sp
150 pea ret_from_exception
151 jmp schedule
152
153ENTRY(ret_from_user_signal)
154 moveq #__NR_sigreturn,%d0
155 trap #0
156
157ENTRY(ret_from_user_rt_signal)
158 movel #__NR_rt_sigreturn,%d0
159 trap #0
160
161#else
162
163do_trace_entry:
164 movel #-ENOSYS,%sp@(PT_OFF_D0)| needed for strace
165 subql #4,%sp
166 SAVE_SWITCH_STACK
167 jbsr syscall_trace
168 RESTORE_SWITCH_STACK
169 addql #4,%sp
170 movel %sp@(PT_OFF_ORIG_D0),%d0
171 cmpl #NR_syscalls,%d0
172 jcs syscall
173badsys:
174 movel #-ENOSYS,%sp@(PT_OFF_D0)
175 jra ret_from_syscall
176
177do_trace_exit:
178 subql #4,%sp
179 SAVE_SWITCH_STACK
180 jbsr syscall_trace
181 RESTORE_SWITCH_STACK
182 addql #4,%sp
183 jra .Lret_from_exception
184
185ENTRY(ret_from_signal)
186 movel %curptr@(TASK_STACK),%a1
187 tstb %a1@(TINFO_FLAGS+2)
188 jge 1f
189 jbsr syscall_trace
1901: RESTORE_SWITCH_STACK
191 addql #4,%sp
192/* on 68040 complete pending writebacks if any */
193#ifdef CONFIG_M68040
194 bfextu %sp@(PT_OFF_FORMATVEC){#0,#4},%d0
195 subql #7,%d0 | bus error frame ?
196 jbne 1f
197 movel %sp,%sp@-
198 jbsr berr_040cleanup
199 addql #4,%sp
2001:
201#endif
202 jra .Lret_from_exception
203
204ENTRY(system_call)
205 SAVE_ALL_SYS
206
207 GET_CURRENT(%d1)
208 movel %d1,%a1
209
210 | save top of frame
211 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
212
213 | syscall trace?
214 tstb %a1@(TINFO_FLAGS+2)
215 jmi do_trace_entry
216 cmpl #NR_syscalls,%d0
217 jcc badsys
218syscall:
219 jbsr @(sys_call_table,%d0:l:4)@(0)
220 movel %d0,%sp@(PT_OFF_D0) | save the return value
221ret_from_syscall:
222 |oriw #0x0700,%sr
223 movel %curptr@(TASK_STACK),%a1
224 movew %a1@(TINFO_FLAGS+2),%d0
225 jne syscall_exit_work
2261: RESTORE_ALL
227
228syscall_exit_work:
229 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
230 bnes 1b | if so, skip resched, signals
231 lslw #1,%d0
232 jcs do_trace_exit
233 jmi do_delayed_trace
234 lslw #8,%d0
235 jne do_signal_return
236 pea resume_userspace
237 jra schedule
238
239
240ENTRY(ret_from_exception)
241.Lret_from_exception:
242 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
243 bnes 1f | if so, skip resched, signals
244 | only allow interrupts when we are really the last one on the
245 | kernel stack, otherwise stack overflow can occur during
246 | heavy interrupt load
247 andw #ALLOWINT,%sr
248
249resume_userspace:
250 movel %curptr@(TASK_STACK),%a1
251 moveb %a1@(TINFO_FLAGS+3),%d0
252 jne exit_work
2531: RESTORE_ALL
254
255exit_work:
256 | save top of frame
257 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
258 lslb #1,%d0
259 jne do_signal_return
260 pea resume_userspace
261 jra schedule
262
263
264do_signal_return:
265 |andw #ALLOWINT,%sr
266 subql #4,%sp | dummy return address
267 SAVE_SWITCH_STACK
268 pea %sp@(SWITCH_STACK_SIZE)
269 bsrl do_notify_resume
270 addql #4,%sp
271 RESTORE_SWITCH_STACK
272 addql #4,%sp
273 jbra resume_userspace
274
275do_delayed_trace:
276 bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR
277 pea 1 | send SIGTRAP
278 movel %curptr,%sp@-
279 pea LSIGTRAP
280 jbsr send_sig
281 addql #8,%sp
282 addql #4,%sp
283 jbra resume_userspace
284
285
286/* This is the main interrupt handler for autovector interrupts */
287
288ENTRY(auto_inthandler)
289 SAVE_ALL_INT
290 GET_CURRENT(%d0)
291 | put exception # in d0
292 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
293 subw #VEC_SPUR,%d0
294
295 movel %sp,%sp@-
296 movel %d0,%sp@- | put vector # on stack
297auto_irqhandler_fixup = . + 2
298 jsr do_IRQ | process the IRQ
299 addql #8,%sp | pop parameters off stack
300 jra ret_from_exception
301
302/* Handler for user defined interrupt vectors */
303
304ENTRY(user_inthandler)
305 SAVE_ALL_INT
306 GET_CURRENT(%d0)
307 | put exception # in d0
308 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
309user_irqvec_fixup = . + 2
310 subw #VEC_USER,%d0
311
312 movel %sp,%sp@-
313 movel %d0,%sp@- | put vector # on stack
314 jsr do_IRQ | process the IRQ
315 addql #8,%sp | pop parameters off stack
316 jra ret_from_exception
317
318/* Handler for uninitialized and spurious interrupts */
319
320ENTRY(bad_inthandler)
321 SAVE_ALL_INT
322 GET_CURRENT(%d0)
323
324 movel %sp,%sp@-
325 jsr handle_badint
326 addql #4,%sp
327 jra ret_from_exception
328
329resume:
330 /*
331 * Beware - when entering resume, prev (the current task) is
332 * in a0, next (the new task) is in a1,so don't change these
333 * registers until their contents are no longer needed.
334 */
335
336 /* save sr */
337 movew %sr,%a0@(TASK_THREAD+THREAD_SR)
338
339 /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
340 movec %sfc,%d0
341 movew %d0,%a0@(TASK_THREAD+THREAD_FS)
342
343 /* save usp */
344 /* it is better to use a movel here instead of a movew 8*) */
345 movec %usp,%d0
346 movel %d0,%a0@(TASK_THREAD+THREAD_USP)
347
348 /* save non-scratch registers on stack */
349 SAVE_SWITCH_STACK
350
351 /* save current kernel stack pointer */
352 movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
353
354 /* save floating point context */
355#ifndef CONFIG_M68KFPU_EMU_ONLY
356#ifdef CONFIG_M68KFPU_EMU
357 tstl m68k_fputype
358 jeq 3f
359#endif
360 fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
361
362#if defined(CONFIG_M68060)
363#if !defined(CPU_M68060_ONLY)
364 btst #3,m68k_cputype+3
365 beqs 1f
366#endif
367 /* The 060 FPU keeps status in bits 15-8 of the first longword */
368 tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
369 jeq 3f
370#if !defined(CPU_M68060_ONLY)
371 jra 2f
372#endif
373#endif /* CONFIG_M68060 */
374#if !defined(CPU_M68060_ONLY)
3751: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
376 jeq 3f
377#endif
3782: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
379 fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
3803:
381#endif /* CONFIG_M68KFPU_EMU_ONLY */
382 /* Return previous task in %d1 */
383 movel %curptr,%d1
384
385 /* switch to new task (a1 contains new task) */
386 movel %a1,%curptr
387
388 /* restore floating point context */
389#ifndef CONFIG_M68KFPU_EMU_ONLY
390#ifdef CONFIG_M68KFPU_EMU
391 tstl m68k_fputype
392 jeq 4f
393#endif
394#if defined(CONFIG_M68060)
395#if !defined(CPU_M68060_ONLY)
396 btst #3,m68k_cputype+3
397 beqs 1f
398#endif
399 /* The 060 FPU keeps status in bits 15-8 of the first longword */
400 tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
401 jeq 3f
402#if !defined(CPU_M68060_ONLY)
403 jra 2f
404#endif
405#endif /* CONFIG_M68060 */
406#if !defined(CPU_M68060_ONLY)
4071: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
408 jeq 3f
409#endif
4102: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
411 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
4123: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
4134:
414#endif /* CONFIG_M68KFPU_EMU_ONLY */
415
416 /* restore the kernel stack pointer */
417 movel %a1@(TASK_THREAD+THREAD_KSP),%sp
418
419 /* restore non-scratch registers */
420 RESTORE_SWITCH_STACK
421
422 /* restore user stack pointer */
423 movel %a1@(TASK_THREAD+THREAD_USP),%a0
424 movel %a0,%usp
425
426 /* restore fs (sfc,%dfc) */
427 movew %a1@(TASK_THREAD+THREAD_FS),%a0
428 movec %a0,%sfc
429 movec %a0,%dfc
430
431 /* restore status register */
432 movew %a1@(TASK_THREAD+THREAD_SR),%sr
433
434 rts
435
436#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
1/* -*- mode: asm -*-
2 *
3 * linux/arch/m68k/kernel/entry.S
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file README.legal in the main directory of this archive
9 * for more details.
10 *
11 * Linux/m68k support by Hamish Macdonald
12 *
13 * 68060 fixes by Jesper Skov
14 *
15 */
16
17/*
18 * entry.S contains the system-call and fault low-level handling routines.
19 * This also contains the timer-interrupt handler, as well as all interrupts
20 * and faults that can result in a task-switch.
21 *
22 * NOTE: This code handles signal-recognition, which happens every time
23 * after a timer-interrupt and after each system call.
24 *
25 */
26
27/*
28 * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
29 * all pointers that used to be 'current' are now entry
30 * number 0 in the 'current_set' list.
31 *
32 * 6/05/00 RZ: addedd writeback completion after return from sighandler
33 * for 68040
34 */
35
36#include <linux/linkage.h>
37#include <asm/errno.h>
38#include <asm/setup.h>
39#include <asm/traps.h>
40#include <asm/unistd.h>
41#include <asm/asm-offsets.h>
42#include <asm/entry.h>
43
44.globl system_call, buserr, trap, resume
45.globl sys_call_table
46.globl __sys_fork, __sys_clone, __sys_vfork
47.globl bad_interrupt
48.globl auto_irqhandler_fixup
49.globl user_irqvec_fixup
50
51.text
52ENTRY(__sys_fork)
53 SAVE_SWITCH_STACK
54 jbsr sys_fork
55 lea %sp@(24),%sp
56 rts
57
58ENTRY(__sys_clone)
59 SAVE_SWITCH_STACK
60 pea %sp@(SWITCH_STACK_SIZE)
61 jbsr m68k_clone
62 lea %sp@(28),%sp
63 rts
64
65ENTRY(__sys_vfork)
66 SAVE_SWITCH_STACK
67 jbsr sys_vfork
68 lea %sp@(24),%sp
69 rts
70
71ENTRY(__sys_clone3)
72 SAVE_SWITCH_STACK
73 pea %sp@(SWITCH_STACK_SIZE)
74 jbsr m68k_clone3
75 lea %sp@(28),%sp
76 rts
77
78ENTRY(sys_sigreturn)
79 SAVE_SWITCH_STACK
80 movel %sp,%a1 | switch_stack pointer
81 lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
82 lea %sp@(-84),%sp | leave a gap
83 movel %a1,%sp@-
84 movel %a0,%sp@-
85 jbsr do_sigreturn
86 jra 1f | shared with rt_sigreturn()
87
88ENTRY(sys_rt_sigreturn)
89 SAVE_SWITCH_STACK
90 movel %sp,%a1 | switch_stack pointer
91 lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
92 lea %sp@(-84),%sp | leave a gap
93 movel %a1,%sp@-
94 movel %a0,%sp@-
95 | stack contents:
96 | [original pt_regs address] [original switch_stack address]
97 | [gap] [switch_stack] [pt_regs] [exception frame]
98 jbsr do_rt_sigreturn
99
1001:
101 | stack contents now:
102 | [original pt_regs address] [original switch_stack address]
103 | [unused part of the gap] [moved switch_stack] [moved pt_regs]
104 | [replacement exception frame]
105 | return value of do_{rt_,}sigreturn() points to moved switch_stack.
106
107 movel %d0,%sp | discard the leftover junk
108 RESTORE_SWITCH_STACK
109 | stack contents now is just [syscall return address] [pt_regs] [frame]
110 | return pt_regs.d0
111 movel %sp@(PT_OFF_D0+4),%d0
112 rts
113
114ENTRY(buserr)
115 SAVE_ALL_INT
116 GET_CURRENT(%d0)
117 movel %sp,%sp@- | stack frame pointer argument
118 jbsr buserr_c
119 addql #4,%sp
120 jra ret_from_exception
121
122ENTRY(trap)
123 SAVE_ALL_INT
124 GET_CURRENT(%d0)
125 movel %sp,%sp@- | stack frame pointer argument
126 jbsr trap_c
127 addql #4,%sp
128 jra ret_from_exception
129
130 | After a fork we jump here directly from resume,
131 | so that %d1 contains the previous task
132 | schedule_tail now used regardless of CONFIG_SMP
133ENTRY(ret_from_fork)
134 movel %d1,%sp@-
135 jsr schedule_tail
136 addql #4,%sp
137 jra ret_from_exception
138
139ENTRY(ret_from_kernel_thread)
140 | a3 contains the kernel thread payload, d7 - its argument
141 movel %d1,%sp@-
142 jsr schedule_tail
143 movel %d7,(%sp)
144 jsr %a3@
145 addql #4,%sp
146 jra ret_from_exception
147
148#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
149
150#ifdef TRAP_DBG_INTERRUPT
151
152.globl dbginterrupt
153ENTRY(dbginterrupt)
154 SAVE_ALL_INT
155 GET_CURRENT(%d0)
156 movel %sp,%sp@- /* stack frame pointer argument */
157 jsr dbginterrupt_c
158 addql #4,%sp
159 jra ret_from_exception
160#endif
161
162ENTRY(reschedule)
163 /* save top of frame */
164 pea %sp@
165 jbsr set_esp0
166 addql #4,%sp
167 pea ret_from_exception
168 jmp schedule
169
170ENTRY(ret_from_user_signal)
171 moveq #__NR_sigreturn,%d0
172 trap #0
173
174ENTRY(ret_from_user_rt_signal)
175 movel #__NR_rt_sigreturn,%d0
176 trap #0
177
178#else
179
180do_trace_entry:
181 movel #-ENOSYS,%sp@(PT_OFF_D0)| needed for strace
182 subql #4,%sp
183 SAVE_SWITCH_STACK
184 jbsr syscall_trace_enter
185 RESTORE_SWITCH_STACK
186 addql #4,%sp
187 movel %sp@(PT_OFF_ORIG_D0),%d0
188 cmpl #NR_syscalls,%d0
189 jcs syscall
190badsys:
191 movel #-ENOSYS,%sp@(PT_OFF_D0)
192 jra ret_from_syscall
193
194do_trace_exit:
195 subql #4,%sp
196 SAVE_SWITCH_STACK
197 jbsr syscall_trace_leave
198 RESTORE_SWITCH_STACK
199 addql #4,%sp
200 jra .Lret_from_exception
201
202ENTRY(system_call)
203 SAVE_ALL_SYS
204
205 GET_CURRENT(%d1)
206 movel %d1,%a1
207
208 | save top of frame
209 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
210
211 | syscall trace?
212 tstb %a1@(TINFO_FLAGS+2)
213 jmi do_trace_entry
214 cmpl #NR_syscalls,%d0
215 jcc badsys
216syscall:
217 jbsr @(sys_call_table,%d0:l:4)@(0)
218 movel %d0,%sp@(PT_OFF_D0) | save the return value
219ret_from_syscall:
220 |oriw #0x0700,%sr
221 movel %curptr@(TASK_STACK),%a1
222 movew %a1@(TINFO_FLAGS+2),%d0
223 jne syscall_exit_work
2241: RESTORE_ALL
225
226syscall_exit_work:
227 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
228 bnes 1b | if so, skip resched, signals
229 lslw #1,%d0
230 jcs do_trace_exit
231 jmi do_delayed_trace
232 lslw #8,%d0
233 jne do_signal_return
234 pea resume_userspace
235 jra schedule
236
237
238ENTRY(ret_from_exception)
239.Lret_from_exception:
240 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
241 bnes 1f | if so, skip resched, signals
242 | only allow interrupts when we are really the last one on the
243 | kernel stack, otherwise stack overflow can occur during
244 | heavy interrupt load
245 andw #ALLOWINT,%sr
246
247resume_userspace:
248 movel %curptr@(TASK_STACK),%a1
249 moveb %a1@(TINFO_FLAGS+3),%d0
250 jne exit_work
2511: RESTORE_ALL
252
253exit_work:
254 | save top of frame
255 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
256 lslb #1,%d0
257 jne do_signal_return
258 pea resume_userspace
259 jra schedule
260
261
262do_signal_return:
263 |andw #ALLOWINT,%sr
264 subql #4,%sp | dummy return address
265 SAVE_SWITCH_STACK
266 pea %sp@(SWITCH_STACK_SIZE)
267 bsrl do_notify_resume
268 addql #4,%sp
269 RESTORE_SWITCH_STACK
270 addql #4,%sp
271 jbra resume_userspace
272
273do_delayed_trace:
274 bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR
275 pea 1 | send SIGTRAP
276 movel %curptr,%sp@-
277 pea LSIGTRAP
278 jbsr send_sig
279 addql #8,%sp
280 addql #4,%sp
281 jbra resume_userspace
282
283
284/* This is the main interrupt handler for autovector interrupts */
285
286ENTRY(auto_inthandler)
287 SAVE_ALL_INT
288 GET_CURRENT(%d0)
289 | put exception # in d0
290 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
291 subw #VEC_SPUR,%d0
292
293 movel %sp,%sp@-
294 movel %d0,%sp@- | put vector # on stack
295auto_irqhandler_fixup = . + 2
296 jsr do_IRQ | process the IRQ
297 addql #8,%sp | pop parameters off stack
298 jra ret_from_exception
299
300/* Handler for user defined interrupt vectors */
301
302ENTRY(user_inthandler)
303 SAVE_ALL_INT
304 GET_CURRENT(%d0)
305 | put exception # in d0
306 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
307user_irqvec_fixup = . + 2
308 subw #VEC_USER,%d0
309
310 movel %sp,%sp@-
311 movel %d0,%sp@- | put vector # on stack
312 jsr do_IRQ | process the IRQ
313 addql #8,%sp | pop parameters off stack
314 jra ret_from_exception
315
316/* Handler for uninitialized and spurious interrupts */
317
318ENTRY(bad_inthandler)
319 SAVE_ALL_INT
320 GET_CURRENT(%d0)
321
322 movel %sp,%sp@-
323 jsr handle_badint
324 addql #4,%sp
325 jra ret_from_exception
326
327resume:
328 /*
329 * Beware - when entering resume, prev (the current task) is
330 * in a0, next (the new task) is in a1,so don't change these
331 * registers until their contents are no longer needed.
332 */
333
334 /* save sr */
335 movew %sr,%a0@(TASK_THREAD+THREAD_SR)
336
337 /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
338 movec %sfc,%d0
339 movew %d0,%a0@(TASK_THREAD+THREAD_FC)
340
341 /* save usp */
342 /* it is better to use a movel here instead of a movew 8*) */
343 movec %usp,%d0
344 movel %d0,%a0@(TASK_THREAD+THREAD_USP)
345
346 /* save non-scratch registers on stack */
347 SAVE_SWITCH_STACK
348
349 /* save current kernel stack pointer */
350 movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
351
352 /* save floating point context */
353#ifndef CONFIG_M68KFPU_EMU_ONLY
354#ifdef CONFIG_M68KFPU_EMU
355 tstl m68k_fputype
356 jeq 3f
357#endif
358 fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
359
360#if defined(CONFIG_M68060)
361#if !defined(CPU_M68060_ONLY)
362 btst #3,m68k_cputype+3
363 beqs 1f
364#endif
365 /* The 060 FPU keeps status in bits 15-8 of the first longword */
366 tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
367 jeq 3f
368#if !defined(CPU_M68060_ONLY)
369 jra 2f
370#endif
371#endif /* CONFIG_M68060 */
372#if !defined(CPU_M68060_ONLY)
3731: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
374 jeq 3f
375#endif
3762: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
377 fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
3783:
379#endif /* CONFIG_M68KFPU_EMU_ONLY */
380 /* Return previous task in %d1 */
381 movel %curptr,%d1
382
383 /* switch to new task (a1 contains new task) */
384 movel %a1,%curptr
385
386 /* restore floating point context */
387#ifndef CONFIG_M68KFPU_EMU_ONLY
388#ifdef CONFIG_M68KFPU_EMU
389 tstl m68k_fputype
390 jeq 4f
391#endif
392#if defined(CONFIG_M68060)
393#if !defined(CPU_M68060_ONLY)
394 btst #3,m68k_cputype+3
395 beqs 1f
396#endif
397 /* The 060 FPU keeps status in bits 15-8 of the first longword */
398 tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
399 jeq 3f
400#if !defined(CPU_M68060_ONLY)
401 jra 2f
402#endif
403#endif /* CONFIG_M68060 */
404#if !defined(CPU_M68060_ONLY)
4051: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
406 jeq 3f
407#endif
4082: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
409 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
4103: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
4114:
412#endif /* CONFIG_M68KFPU_EMU_ONLY */
413
414 /* restore the kernel stack pointer */
415 movel %a1@(TASK_THREAD+THREAD_KSP),%sp
416
417 /* restore non-scratch registers */
418 RESTORE_SWITCH_STACK
419
420 /* restore user stack pointer */
421 movel %a1@(TASK_THREAD+THREAD_USP),%a0
422 movel %a0,%usp
423
424 /* restore fs (sfc,%dfc) */
425 movew %a1@(TASK_THREAD+THREAD_FC),%a0
426 movec %a0,%sfc
427 movec %a0,%dfc
428
429 /* restore status register */
430 movew %a1@(TASK_THREAD+THREAD_SR),%sr
431
432 rts
433
434#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */