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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
72af70cf | 2 | /* |
1da177e4 LT |
3 | * linux/arch/cris/entry.S |
4 | * | |
5 | * Copyright (C) 2000, 2001, 2002 Axis Communications AB | |
6 | * | |
7 | * Authors: Bjorn Wesen (bjornw@axis.com) | |
1da177e4 LT |
8 | */ |
9 | ||
10 | /* | |
11 | * entry.S contains the system-call and fault low-level handling routines. | |
12 | * | |
13 | * NOTE: This code handles signal-recognition, which happens every time | |
14 | * after a timer-interrupt and after each system call. | |
15 | * | |
16 | * Stack layout in 'ret_from_system_call': | |
bb1d2a94 JN |
17 | * ptrace needs to have all regs on the stack. |
18 | * if the order here is changed, it needs to be | |
1da177e4 LT |
19 | * updated in fork.c:copy_process, signal.c:do_signal, |
20 | * ptrace.c and ptrace.h | |
21 | * | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/linkage.h> |
25 | #include <linux/sys.h> | |
26 | #include <asm/unistd.h> | |
556dcee7 | 27 | #include <arch/sv_addr_ag.h> |
1da177e4 LT |
28 | #include <asm/errno.h> |
29 | #include <asm/thread_info.h> | |
5a077369 | 30 | #include <asm/asm-offsets.h> |
1da177e4 LT |
31 | #include <asm/page.h> |
32 | #include <asm/pgtable.h> | |
33 | ||
34 | ;; functions exported from this file | |
bb1d2a94 | 35 | |
1da177e4 LT |
36 | .globl system_call |
37 | .globl ret_from_intr | |
38 | .globl ret_from_fork | |
69b58a67 | 39 | .globl ret_from_kernel_thread |
1da177e4 LT |
40 | .globl resume |
41 | .globl multiple_interrupt | |
42 | .globl hwbreakpoint | |
43 | .globl IRQ1_interrupt | |
44 | .globl spurious_interrupt | |
45 | .globl hw_bp_trigs | |
46 | .globl mmu_bus_fault | |
47 | .globl do_sigtrap | |
48 | .globl gdb_handle_breakpoint | |
49 | .globl sys_call_table | |
bb1d2a94 | 50 | |
1da177e4 | 51 | ;; below are various parts of system_call which are not in the fast-path |
bb1d2a94 JN |
52 | |
53 | #ifdef CONFIG_PREEMPT | |
1da177e4 LT |
54 | ; Check if preemptive kernel scheduling should be done |
55 | _resume_kernel: | |
7cf32cad | 56 | di |
1da177e4 LT |
57 | ; Load current task struct |
58 | movs.w -8192, $r0 ; THREAD_SIZE = 8192 | |
59 | and.d $sp, $r0 | |
60 | move.d [$r0+TI_preempt_count], $r10 ; Preemption disabled? | |
61 | bne _Rexit | |
62 | nop | |
63 | _need_resched: | |
64 | move.d [$r0+TI_flags], $r10 | |
65 | btstq TIF_NEED_RESCHED, $r10 ; Check if need_resched is set | |
66 | bpl _Rexit | |
67 | nop | |
68 | ; Ok, lets's do some preemptive kernel scheduling | |
7cf32cad | 69 | jsr preempt_schedule_irq |
1da177e4 LT |
70 | ; Load new task struct |
71 | movs.w -8192, $r0 ; THREAD_SIZE = 8192 | |
72 | and.d $sp, $r0 | |
73 | ; One more time (with new task) | |
74 | ba _need_resched | |
75 | nop | |
76 | #else | |
77 | #define _resume_kernel _Rexit | |
bb1d2a94 | 78 | #endif |
1da177e4 LT |
79 | |
80 | ; Called at exit from fork. schedule_tail must be called to drop | |
81 | ; spinlock if CONFIG_PREEMPT | |
82 | ret_from_fork: | |
83 | jsr schedule_tail | |
84 | ba ret_from_sys_call | |
85 | nop | |
69b58a67 AV |
86 | |
87 | ret_from_kernel_thread: | |
88 | jsr schedule_tail | |
89 | move.d $r2, $r10 ; argument is here | |
90 | jsr $r1 ; call the payload | |
1703a219 AV |
91 | moveq 0, $r9 ; no syscall restarts, TYVM... |
92 | ba ret_from_sys_call | |
69b58a67 | 93 | |
1da177e4 | 94 | ret_from_intr: |
bb1d2a94 | 95 | ;; check for resched if preemptive kernel or if we're going back to user-mode |
1da177e4 LT |
96 | ;; this test matches the user_regs(regs) macro |
97 | ;; we cannot simply test $dccr, because that does not necessarily | |
98 | ;; reflect what mode we'll return into. | |
bb1d2a94 | 99 | |
1da177e4 LT |
100 | move.d [$sp + PT_dccr], $r0; regs->dccr |
101 | btstq 8, $r0 ; U-flag | |
102 | bpl _resume_kernel | |
bb1d2a94 JN |
103 | ; Note that di below is in delay slot |
104 | ||
1da177e4 LT |
105 | _resume_userspace: |
106 | di ; so need_resched and sigpending don't change | |
107 | ||
108 | movs.w -8192, $r0 ; THREAD_SIZE == 8192 | |
109 | and.d $sp, $r0 | |
110 | ||
111 | move.d [$r0+TI_flags], $r10 ; current->work | |
112 | and.d _TIF_WORK_MASK, $r10 ; is there any work to be done on return | |
113 | bne _work_pending | |
114 | nop | |
115 | ba _Rexit | |
116 | nop | |
bb1d2a94 | 117 | |
1da177e4 LT |
118 | ;; The system_call is called by a BREAK instruction, which works like |
119 | ;; an interrupt call but it stores the return PC in BRP instead of IRP. | |
120 | ;; Since we dont really want to have two epilogues (one for system calls | |
121 | ;; and one for interrupts) we push the contents of BRP instead of IRP in the | |
122 | ;; system call prologue, to make it look like an ordinary interrupt on the | |
123 | ;; stackframe. | |
124 | ;; | |
125 | ;; Since we can't have system calls inside interrupts, it should not matter | |
126 | ;; that we don't stack IRP. | |
bb1d2a94 | 127 | ;; |
1da177e4 LT |
128 | ;; In r9 we have the wanted syscall number. Arguments come in r10,r11,r12,r13,mof,srp |
129 | ;; | |
130 | ;; This function looks on the _surface_ like spaghetti programming, but it's | |
131 | ;; really designed so that the fast-path does not force cache-loading of non-used | |
132 | ;; instructions. Only the non-common cases cause the outlined code to run.. | |
133 | ||
134 | system_call: | |
135 | ;; stack-frame similar to the irq heads, which is reversed in ret_from_sys_call | |
136 | move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame | |
137 | push $srp | |
138 | push $dccr | |
139 | push $mof | |
140 | subq 14*4, $sp ; make room for r0-r13 | |
141 | movem $r13, [$sp] ; push r0-r13 | |
142 | push $r10 ; push orig_r10 | |
143 | clear.d [$sp=$sp-4] ; frametype == 0, normal stackframe | |
bb1d2a94 | 144 | |
1da177e4 LT |
145 | movs.w -ENOSYS, $r0 |
146 | move.d $r0, [$sp+PT_r10] ; put the default return value in r10 in the frame | |
147 | ||
148 | ;; check if this process is syscall-traced | |
149 | ||
150 | movs.w -8192, $r0 ; THREAD_SIZE == 8192 | |
151 | and.d $sp, $r0 | |
bb1d2a94 | 152 | |
1da177e4 LT |
153 | move.d [$r0+TI_flags], $r0 |
154 | btstq TIF_SYSCALL_TRACE, $r0 | |
155 | bmi _syscall_trace_entry | |
bb1d2a94 | 156 | nop |
1da177e4 | 157 | |
bb1d2a94 | 158 | _syscall_traced: |
1da177e4 LT |
159 | |
160 | ;; check for sanity in the requested syscall number | |
bb1d2a94 JN |
161 | |
162 | cmpu.w NR_syscalls, $r9 | |
1da177e4 LT |
163 | bcc ret_from_sys_call |
164 | lslq 2, $r9 ; multiply by 4, in the delay slot | |
165 | ||
166 | ;; as a bonus 7th parameter, we give the location on the stack | |
167 | ;; of the register structure itself. some syscalls need this. | |
168 | ||
169 | push $sp | |
bb1d2a94 | 170 | |
1da177e4 | 171 | ;; the parameter carrying registers r10, r11, r12 and 13 are intact. |
bb1d2a94 | 172 | ;; the fifth and sixth parameters (if any) was in mof and srp |
1da177e4 LT |
173 | ;; respectively, and we need to put them on the stack. |
174 | ||
175 | push $srp | |
176 | push $mof | |
bb1d2a94 | 177 | |
1da177e4 LT |
178 | jsr [$r9+sys_call_table] ; actually do the system call |
179 | addq 3*4, $sp ; pop the mof, srp and regs parameters | |
180 | move.d $r10, [$sp+PT_r10] ; save the return value | |
181 | ||
182 | moveq 1, $r9 ; "parameter" to ret_from_sys_call to show it was a sys call | |
bb1d2a94 | 183 | |
1da177e4 | 184 | ;; fall through into ret_from_sys_call to return |
bb1d2a94 | 185 | |
1da177e4 LT |
186 | ret_from_sys_call: |
187 | ;; r9 is a parameter - if >=1 we came from a syscall, if 0, from an irq | |
bb1d2a94 | 188 | |
1da177e4 LT |
189 | ;; get the current task-struct pointer (see top for defs) |
190 | ||
bb1d2a94 | 191 | movs.w -8192, $r0 ; THREAD_SIZE == 8192 |
1da177e4 LT |
192 | and.d $sp, $r0 |
193 | ||
194 | di ; make sure need_resched and sigpending don't change | |
195 | move.d [$r0+TI_flags],$r1 | |
196 | and.d _TIF_ALLWORK_MASK, $r1 | |
197 | bne _syscall_exit_work | |
198 | nop | |
199 | ||
200 | _Rexit: | |
201 | ;; this epilogue MUST match the prologues in multiple_interrupt, irq.h and ptregs.h | |
202 | pop $r10 ; frametype | |
203 | bne _RBFexit ; was not CRIS_FRAME_NORMAL, handle otherwise | |
204 | addq 4, $sp ; skip orig_r10, in delayslot | |
205 | movem [$sp+], $r13 ; registers r0-r13 | |
bb1d2a94 | 206 | pop $mof ; multiply overflow register |
1da177e4 LT |
207 | pop $dccr ; condition codes |
208 | pop $srp ; subroutine return pointer | |
209 | ;; now we have a 4-word SBFS frame which we do not want to restore | |
210 | ;; using RBF since it was not stacked with SBFS. instead we would like to | |
211 | ;; just get the PC value to restart it with, and skip the rest of | |
212 | ;; the frame. | |
213 | ;; Also notice that it's important to use instructions here that | |
214 | ;; keep the interrupts disabled (since we've already popped DCCR) | |
215 | move [$sp=$sp+16], $p8; pop the SBFS frame from the sp | |
216 | jmpu [$sp-16] ; return through the irp field in the sbfs frame | |
217 | ||
218 | _RBFexit: | |
219 | movem [$sp+], $r13 ; registers r0-r13, in delay slot | |
bb1d2a94 | 220 | pop $mof ; multiply overflow register |
1da177e4 LT |
221 | pop $dccr ; condition codes |
222 | pop $srp ; subroutine return pointer | |
223 | rbf [$sp+] ; return by popping the CPU status | |
224 | ||
225 | ;; We get here after doing a syscall if extra work might need to be done | |
226 | ;; perform syscall exit tracing if needed | |
bb1d2a94 | 227 | |
1da177e4 LT |
228 | _syscall_exit_work: |
229 | ;; $r0 contains current at this point and irq's are disabled | |
230 | ||
231 | move.d [$r0+TI_flags], $r1 | |
232 | btstq TIF_SYSCALL_TRACE, $r1 | |
233 | bpl _work_pending | |
234 | nop | |
bb1d2a94 | 235 | |
1da177e4 LT |
236 | ei |
237 | ||
238 | move.d $r9, $r1 ; preserve r9 | |
239 | jsr do_syscall_trace | |
240 | move.d $r1, $r9 | |
bb1d2a94 | 241 | |
1da177e4 LT |
242 | ba _resume_userspace |
243 | nop | |
bb1d2a94 | 244 | |
1da177e4 LT |
245 | _work_pending: |
246 | move.d [$r0+TI_flags], $r1 | |
247 | btstq TIF_NEED_RESCHED, $r1 | |
248 | bpl _work_notifysig ; was neither trace nor sched, must be signal/notify | |
249 | nop | |
bb1d2a94 | 250 | |
1da177e4 LT |
251 | _work_resched: |
252 | move.d $r9, $r1 ; preserve r9 | |
253 | jsr schedule | |
254 | move.d $r1, $r9 | |
255 | di | |
256 | ||
257 | move.d [$r0+TI_flags], $r1 | |
258 | and.d _TIF_WORK_MASK, $r1; ignore the syscall trace counter | |
259 | beq _Rexit | |
260 | nop | |
261 | btstq TIF_NEED_RESCHED, $r1 | |
262 | bmi _work_resched ; current->work.need_resched | |
263 | nop | |
264 | ||
265 | _work_notifysig: | |
266 | ;; deal with pending signals and notify-resume requests | |
267 | ||
268 | move.d $r9, $r10 ; do_notify_resume syscall/irq param | |
7b275523 JN |
269 | move.d $sp, $r11 ; the regs param |
270 | move.d $r1, $r12 ; the thread_info_flags parameter | |
1da177e4 | 271 | jsr do_notify_resume |
bb1d2a94 | 272 | |
1da177e4 LT |
273 | ba _Rexit |
274 | nop | |
275 | ||
276 | ;; We get here as a sidetrack when we've entered a syscall with the | |
277 | ;; trace-bit set. We need to call do_syscall_trace and then continue | |
278 | ;; with the call. | |
bb1d2a94 | 279 | |
1da177e4 LT |
280 | _syscall_trace_entry: |
281 | ;; PT_r10 in the frame contains -ENOSYS as required, at this point | |
bb1d2a94 | 282 | |
1da177e4 LT |
283 | jsr do_syscall_trace |
284 | ||
285 | ;; now re-enter the syscall code to do the syscall itself | |
286 | ;; we need to restore $r9 here to contain the wanted syscall, and | |
287 | ;; the other parameter-bearing registers | |
288 | ||
289 | move.d [$sp+PT_r9], $r9 | |
290 | move.d [$sp+PT_orig_r10], $r10 ; PT_r10 is already filled with -ENOSYS. | |
291 | move.d [$sp+PT_r11], $r11 | |
292 | move.d [$sp+PT_r12], $r12 | |
293 | move.d [$sp+PT_r13], $r13 | |
294 | move [$sp+PT_mof], $mof | |
295 | move [$sp+PT_srp], $srp | |
bb1d2a94 | 296 | |
1da177e4 LT |
297 | ba _syscall_traced |
298 | nop | |
bb1d2a94 | 299 | |
1da177e4 LT |
300 | ;; resume performs the actual task-switching, by switching stack pointers |
301 | ;; input arguments: r10 = prev, r11 = next, r12 = thread offset in task struct | |
302 | ;; returns old current in r10 | |
303 | ;; | |
304 | ;; TODO: see the i386 version. The switch_to which calls resume in our version | |
305 | ;; could really be an inline asm of this. | |
306 | ||
bb1d2a94 JN |
307 | resume: |
308 | push $srp ; we keep the old/new PC on the stack | |
1da177e4 LT |
309 | add.d $r12, $r10 ; r10 = current tasks tss |
310 | move $dccr, [$r10+THREAD_dccr]; save irq enable state | |
311 | di | |
312 | ||
313 | move $usp, [$r10+ THREAD_usp] ; save user-mode stackpointer | |
bb1d2a94 | 314 | |
1da177e4 LT |
315 | ;; See copy_thread for the reason why register R9 is saved. |
316 | subq 10*4, $sp | |
317 | movem $r9, [$sp] ; save non-scratch registers and R9. | |
bb1d2a94 | 318 | |
1da177e4 LT |
319 | move.d $sp, [$r10+THREAD_ksp] ; save the kernel stack pointer for the old task |
320 | move.d $sp, $r10 ; return last running task in r10 | |
321 | and.d -8192, $r10 ; get thread_info from stackpointer | |
bb1d2a94 | 322 | move.d [$r10+TI_task], $r10 ; get task |
1da177e4 LT |
323 | add.d $r12, $r11 ; find the new tasks tss |
324 | move.d [$r11+THREAD_ksp], $sp ; switch into the new stackframe by restoring kernel sp | |
325 | ||
326 | movem [$sp+], $r9 ; restore non-scratch registers and R9. | |
327 | ||
328 | move [$r11+THREAD_usp], $usp ; restore user-mode stackpointer | |
bb1d2a94 | 329 | |
1da177e4 LT |
330 | move [$r11+THREAD_dccr], $dccr ; restore irq enable status |
331 | jump [$sp+] ; restore PC | |
332 | ||
333 | ;; This is the MMU bus fault handler. | |
334 | ;; It needs to stack the CPU status and overall is different | |
335 | ;; from the other interrupt handlers. | |
336 | ||
337 | mmu_bus_fault: | |
338 | ;; For refills we try to do a quick page table lookup. If it is | |
339 | ;; a real fault we let the mm subsystem handle it. | |
340 | ||
341 | ;; the first longword in the sbfs frame was the interrupted PC | |
342 | ;; which fits nicely with the "IRP" slot in pt_regs normally used to | |
343 | ;; contain the return address. used by Oops to print kernel errors. | |
344 | sbfs [$sp=$sp-16] ; push the internal CPU status | |
345 | push $dccr | |
346 | di | |
347 | subq 2*4, $sp | |
348 | movem $r1, [$sp] | |
349 | move.d [R_MMU_CAUSE], $r1 | |
350 | ;; ETRAX 100LX TR89 bugfix: if the second half of an unaligned | |
351 | ;; write causes a MMU-fault, it will not be restarted correctly. | |
352 | ;; This could happen if a write crosses a page-boundary and the | |
353 | ;; second page is not yet COW'ed or even loaded. The workaround | |
354 | ;; is to clear the unaligned bit in the CPU status record, so | |
355 | ;; that the CPU will rerun both the first and second halves of | |
356 | ;; the instruction. This will not have any sideeffects unless | |
357 | ;; the first half goes to any device or memory that can't be | |
358 | ;; written twice, and which is mapped through the MMU. | |
359 | ;; | |
360 | ;; We only need to do this for writes. | |
361 | btstq 8, $r1 ; Write access? | |
362 | bpl 1f | |
363 | nop | |
364 | move.d [$sp+16], $r0 ; Clear unaligned bit in csrinstr | |
365 | and.d ~(1<<5), $r0 | |
366 | move.d $r0, [$sp+16] | |
367 | 1: btstq 12, $r1 ; Refill? | |
368 | bpl 2f | |
7cf32cad | 369 | lsrq 24, $r1 ; Get PGD index (bit 24-31) |
dd17c8f7 | 370 | move.d [current_pgd], $r0 ; PGD for the current process |
1da177e4 LT |
371 | move.d [$r0+$r1.d], $r0 ; Get PMD |
372 | beq 2f | |
373 | nop | |
374 | and.w PAGE_MASK, $r0 ; Remove PMD flags | |
375 | move.d [R_MMU_CAUSE], $r1 | |
376 | lsrq PAGE_SHIFT, $r1 | |
7cf32cad | 377 | and.d 0x7ff, $r1 ; Get PTE index into PGD (bit 13-23) |
1da177e4 LT |
378 | move.d [$r0+$r1.d], $r1 ; Get PTE |
379 | beq 2f | |
380 | nop | |
381 | ;; Store in TLB | |
382 | move.d $r1, [R_TLB_LO] | |
383 | ;; Return | |
384 | movem [$sp+], $r1 | |
385 | pop $dccr | |
386 | rbf [$sp+] ; return by popping the CPU status | |
387 | ||
388 | 2: ; PMD or PTE missing, let the mm subsystem fix it up. | |
389 | movem [$sp+], $r1 | |
390 | pop $dccr | |
391 | ||
392 | ; Ok, not that easy, pass it on to the mm subsystem | |
393 | ; The MMU status record is now on the stack | |
394 | push $srp ; make a stackframe similar to pt_regs | |
395 | push $dccr | |
396 | push $mof | |
397 | di | |
398 | subq 14*4, $sp | |
399 | movem $r13, [$sp] | |
400 | push $r10 ; dummy orig_r10 | |
401 | moveq 1, $r10 | |
402 | push $r10 ; frametype == 1, BUSFAULT frame type | |
403 | ||
404 | move.d $sp, $r10 ; pt_regs argument to handle_mmu_bus_fault | |
bb1d2a94 | 405 | |
1da177e4 LT |
406 | jsr handle_mmu_bus_fault ; in arch/cris/arch-v10/mm/fault.c |
407 | ||
408 | ;; now we need to return through the normal path, we cannot just | |
409 | ;; do the RBFexit since we might have killed off the running | |
410 | ;; process due to a SEGV, scheduled due to a page blocking or | |
411 | ;; whatever. | |
412 | ||
413 | moveq 0, $r9 ; busfault is equivalent to an irq | |
bb1d2a94 | 414 | |
1da177e4 LT |
415 | ba ret_from_intr |
416 | nop | |
bb1d2a94 | 417 | |
1da177e4 LT |
418 | ;; special handlers for breakpoint and NMI |
419 | hwbreakpoint: | |
420 | push $dccr | |
421 | di | |
422 | push $r10 | |
423 | push $r11 | |
424 | move.d [hw_bp_trig_ptr],$r10 | |
425 | move $brp,$r11 | |
426 | move.d $r11,[$r10+] | |
427 | move.d $r10,[hw_bp_trig_ptr] | |
428 | 1: pop $r11 | |
429 | pop $r10 | |
430 | pop $dccr | |
431 | retb | |
432 | nop | |
bb1d2a94 | 433 | |
1da177e4 | 434 | IRQ1_interrupt: |
1da177e4 LT |
435 | ;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!! |
436 | move $brp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame | |
437 | push $srp | |
438 | push $dccr | |
439 | push $mof | |
440 | di | |
441 | subq 14*4, $sp | |
442 | movem $r13, [$sp] | |
443 | push $r10 ; push orig_r10 | |
444 | clear.d [$sp=$sp-4] ; frametype == 0, normal frame | |
445 | ||
7b275523 JN |
446 | ;; If there is a glitch on the NMI pin shorter than ~100ns |
447 | ;; (i.e. non-active by the time we get here) then the nmi_pin bit | |
448 | ;; in R_IRQ_MASK0_RD will already be cleared. The watchdog_nmi bit | |
449 | ;; is cleared by us however (when feeding the watchdog), which is why | |
450 | ;; we use that bit to determine what brought us here. | |
451 | ||
7cf32cad | 452 | move.d [R_IRQ_MASK0_RD], $r1 ; External NMI or watchdog? |
7b275523 JN |
453 | and.d (1<<30), $r1 |
454 | bne wdog | |
7cf32cad MS |
455 | move.d $sp, $r10 |
456 | jsr handle_nmi | |
457 | setf m ; Enable NMI again | |
7b275523 | 458 | ba _Rexit ; Return the standard way |
7cf32cad MS |
459 | nop |
460 | wdog: | |
e269a869 | 461 | #if defined(CONFIG_ETRAX_WATCHDOG) |
1da177e4 LT |
462 | ;; Check if we're waiting for reset to happen, as signalled by |
463 | ;; hard_reset_now setting cause_of_death to a magic value. If so, just | |
464 | ;; get stuck until reset happens. | |
465 | .comm cause_of_death, 4 ;; Don't declare this anywhere. | |
466 | move.d [cause_of_death], $r10 | |
467 | cmp.d 0xbedead, $r10 | |
468 | _killed_by_death: | |
469 | beq _killed_by_death | |
470 | nop | |
471 | ||
472 | ;; We'll see this in ksymoops dumps. | |
473 | Watchdog_bite: | |
474 | ||
475 | #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY | |
476 | ;; We just restart the watchdog here to be sure we dont get | |
477 | ;; hit while printing the watchdogmsg below | |
478 | ;; This restart is compatible with the rest of the C-code, so | |
479 | ;; the C-code can keep restarting the watchdog after this point. | |
480 | ;; The non-NICE_DOGGY code below though, disables the possibility | |
481 | ;; to restart since it changes the watchdog key, to avoid any | |
482 | ;; buggy loops etc. keeping the watchdog alive after this. | |
483 | jsr reset_watchdog | |
484 | #else | |
485 | ||
486 | ;; We need to extend the 3.3ms after the NMI at watchdog bite, so we have | |
487 | ;; time for an oops-dump over a 115k2 serial wire. Another 100ms should do. | |
488 | ||
489 | ;; Change the watchdog key to an arbitrary 3-bit value and restart the | |
490 | ;; watchdog. | |
491 | #define WD_INIT 2 | |
492 | moveq IO_FIELD (R_WATCHDOG, key, WD_INIT), $r10 | |
493 | move.d R_WATCHDOG, $r11 | |
494 | ||
495 | move.d $r10, [$r11] | |
496 | moveq IO_FIELD (R_WATCHDOG, key, \ | |
497 | IO_EXTRACT (R_WATCHDOG, key, \ | |
498 | IO_MASK (R_WATCHDOG, key)) \ | |
499 | ^ WD_INIT) \ | |
500 | | IO_STATE (R_WATCHDOG, enable, start), $r10 | |
501 | move.d $r10, [$r11] | |
502 | ||
503 | #endif | |
bb1d2a94 | 504 | |
1da177e4 LT |
505 | ;; Note that we don't do "setf m" here (or after two necessary NOPs), |
506 | ;; since *not* doing that saves us from re-entrancy checks. We don't want | |
507 | ;; to get here again due to possible subsequent NMIs; we want the watchdog | |
508 | ;; to reset us. | |
509 | ||
510 | move.d _watchdogmsg,$r10 | |
511 | jsr printk | |
512 | ||
513 | move.d $sp, $r10 | |
514 | jsr watchdog_bite_hook | |
515 | ||
516 | ;; This nop is here so we see the "Watchdog_bite" label in ksymoops dumps | |
517 | ;; rather than "spurious_interrupt". | |
518 | nop | |
519 | ;; At this point we drop down into spurious_interrupt, which will do a | |
520 | ;; hard reset. | |
521 | ||
522 | .section .rodata,"a" | |
523 | _watchdogmsg: | |
524 | .ascii "Oops: bitten by watchdog\n\0" | |
525 | .previous | |
526 | ||
e269a869 | 527 | #endif /* CONFIG_ETRAX_WATCHDOG */ |
1da177e4 | 528 | |
bb1d2a94 | 529 | spurious_interrupt: |
1da177e4 LT |
530 | di |
531 | jump hard_reset_now | |
532 | ||
533 | ;; this handles the case when multiple interrupts arrive at the same time | |
534 | ;; we jump to the first set interrupt bit in a priority fashion | |
535 | ;; the hardware will call the unserved interrupts after the handler finishes | |
bb1d2a94 | 536 | |
1da177e4 LT |
537 | multiple_interrupt: |
538 | ;; this prologue MUST match the one in irq.h and the struct in ptregs.h!!! | |
539 | move $irp,[$sp=$sp-16]; instruction pointer and room for a fake SBFS frame | |
540 | push $srp | |
541 | push $dccr | |
542 | push $mof | |
543 | di | |
544 | subq 14*4, $sp | |
545 | movem $r13, [$sp] | |
546 | push $r10 ; push orig_r10 | |
547 | clear.d [$sp=$sp-4] ; frametype == 0, normal frame | |
6d3d4be4 | 548 | |
7b275523 JN |
549 | move.d $sp, $r10 |
550 | jsr do_multiple_IRQ | |
6d3d4be4 | 551 | |
1da177e4 LT |
552 | jump ret_from_intr |
553 | ||
554 | do_sigtrap: | |
bb1d2a94 | 555 | ;; |
1da177e4 LT |
556 | ;; SIGTRAP the process that executed the break instruction. |
557 | ;; Make a frame that Rexit in entry.S expects. | |
558 | ;; | |
559 | move $brp, [$sp=$sp-16] ; Push BRP while faking a cpu status record. | |
560 | push $srp ; Push subroutine return pointer. | |
561 | push $dccr ; Push condition codes. | |
562 | push $mof ; Push multiply overflow reg. | |
563 | di ; Need to disable irq's at this point. | |
564 | subq 14*4, $sp ; Make room for r0-r13. | |
565 | movem $r13, [$sp] ; Push the r0-r13 registers. | |
566 | push $r10 ; Push orig_r10. | |
567 | clear.d [$sp=$sp-4] ; Frametype - this is a normal stackframe. | |
568 | ||
569 | movs.w -8192,$r9 ; THREAD_SIZE == 8192 | |
570 | and.d $sp, $r9 | |
571 | move.d [$r9+TI_task], $r10 | |
bb1d2a94 | 572 | move.d [$r10+TASK_pid], $r10 ; current->pid as arg1. |
1da177e4 | 573 | moveq 5, $r11 ; SIGTRAP as arg2. |
bb1d2a94 | 574 | jsr sys_kill |
1da177e4 LT |
575 | jump ret_from_intr ; Use the return routine for interrupts. |
576 | ||
bb1d2a94 | 577 | gdb_handle_breakpoint: |
1da177e4 LT |
578 | push $dccr |
579 | push $r0 | |
580 | #ifdef CONFIG_ETRAX_KGDB | |
bb1d2a94 | 581 | move $dccr, $r0 ; U-flag not affected by previous insns. |
1da177e4 | 582 | btstq 8, $r0 ; Test the U-flag. |
bb1d2a94 JN |
583 | bmi _ugdb_handle_breakpoint ; Go to user mode debugging. |
584 | nop ; Empty delay slot (cannot pop r0 here). | |
1da177e4 | 585 | pop $r0 ; Restore r0. |
bb1d2a94 | 586 | ba kgdb_handle_breakpoint ; Go to kernel debugging. |
1da177e4 LT |
587 | pop $dccr ; Restore dccr in delay slot. |
588 | #endif | |
bb1d2a94 JN |
589 | |
590 | _ugdb_handle_breakpoint: | |
1da177e4 LT |
591 | move $brp, $r0 ; Use r0 temporarily for calculation. |
592 | subq 2, $r0 ; Set to address of previous instruction. | |
593 | move $r0, $brp | |
bb1d2a94 JN |
594 | pop $r0 ; Restore r0. |
595 | ba do_sigtrap ; SIGTRAP the offending process. | |
1da177e4 | 596 | pop $dccr ; Restore dccr in delay slot. |
6d3d4be4 | 597 | |
1da177e4 LT |
598 | .data |
599 | ||
600 | hw_bp_trigs: | |
601 | .space 64*4 | |
602 | hw_bp_trig_ptr: | |
603 | .dword hw_bp_trigs | |
604 | ||
605 | .section .rodata,"a" | |
bb1d2a94 | 606 | sys_call_table: |
1da177e4 LT |
607 | .long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */ |
608 | .long sys_exit | |
609 | .long sys_fork | |
610 | .long sys_read | |
611 | .long sys_write | |
612 | .long sys_open /* 5 */ | |
613 | .long sys_close | |
614 | .long sys_waitpid | |
615 | .long sys_creat | |
616 | .long sys_link | |
617 | .long sys_unlink /* 10 */ | |
618 | .long sys_execve | |
619 | .long sys_chdir | |
620 | .long sys_time | |
621 | .long sys_mknod | |
622 | .long sys_chmod /* 15 */ | |
623 | .long sys_lchown16 | |
624 | .long sys_ni_syscall /* old break syscall holder */ | |
625 | .long sys_stat | |
626 | .long sys_lseek | |
627 | .long sys_getpid /* 20 */ | |
628 | .long sys_mount | |
629 | .long sys_oldumount | |
630 | .long sys_setuid16 | |
631 | .long sys_getuid16 | |
632 | .long sys_stime /* 25 */ | |
633 | .long sys_ptrace | |
634 | .long sys_alarm | |
635 | .long sys_fstat | |
636 | .long sys_pause | |
637 | .long sys_utime /* 30 */ | |
638 | .long sys_ni_syscall /* old stty syscall holder */ | |
639 | .long sys_ni_syscall /* old gtty syscall holder */ | |
640 | .long sys_access | |
641 | .long sys_nice | |
642 | .long sys_ni_syscall /* 35 old ftime syscall holder */ | |
643 | .long sys_sync | |
644 | .long sys_kill | |
645 | .long sys_rename | |
646 | .long sys_mkdir | |
647 | .long sys_rmdir /* 40 */ | |
648 | .long sys_dup | |
649 | .long sys_pipe | |
650 | .long sys_times | |
651 | .long sys_ni_syscall /* old prof syscall holder */ | |
652 | .long sys_brk /* 45 */ | |
653 | .long sys_setgid16 | |
654 | .long sys_getgid16 | |
655 | .long sys_signal | |
656 | .long sys_geteuid16 | |
657 | .long sys_getegid16 /* 50 */ | |
658 | .long sys_acct | |
659 | .long sys_umount /* recycled never used phys( */ | |
660 | .long sys_ni_syscall /* old lock syscall holder */ | |
661 | .long sys_ioctl | |
662 | .long sys_fcntl /* 55 */ | |
663 | .long sys_ni_syscall /* old mpx syscall holder */ | |
664 | .long sys_setpgid | |
665 | .long sys_ni_syscall /* old ulimit syscall holder */ | |
666 | .long sys_ni_syscall /* old sys_olduname holder */ | |
667 | .long sys_umask /* 60 */ | |
668 | .long sys_chroot | |
669 | .long sys_ustat | |
670 | .long sys_dup2 | |
671 | .long sys_getppid | |
672 | .long sys_getpgrp /* 65 */ | |
673 | .long sys_setsid | |
674 | .long sys_sigaction | |
675 | .long sys_sgetmask | |
676 | .long sys_ssetmask | |
677 | .long sys_setreuid16 /* 70 */ | |
678 | .long sys_setregid16 | |
679 | .long sys_sigsuspend | |
680 | .long sys_sigpending | |
681 | .long sys_sethostname | |
682 | .long sys_setrlimit /* 75 */ | |
683 | .long sys_old_getrlimit | |
684 | .long sys_getrusage | |
685 | .long sys_gettimeofday | |
686 | .long sys_settimeofday | |
687 | .long sys_getgroups16 /* 80 */ | |
688 | .long sys_setgroups16 | |
689 | .long sys_select /* was old_select in Linux/E100 */ | |
690 | .long sys_symlink | |
691 | .long sys_lstat | |
692 | .long sys_readlink /* 85 */ | |
693 | .long sys_uselib | |
694 | .long sys_swapon | |
695 | .long sys_reboot | |
e55380ed | 696 | .long sys_old_readdir |
a4679373 | 697 | .long sys_old_mmap /* 90 */ |
1da177e4 LT |
698 | .long sys_munmap |
699 | .long sys_truncate | |
700 | .long sys_ftruncate | |
701 | .long sys_fchmod | |
702 | .long sys_fchown16 /* 95 */ | |
703 | .long sys_getpriority | |
704 | .long sys_setpriority | |
705 | .long sys_ni_syscall /* old profil syscall holder */ | |
706 | .long sys_statfs | |
707 | .long sys_fstatfs /* 100 */ | |
708 | .long sys_ni_syscall /* sys_ioperm in i386 */ | |
709 | .long sys_socketcall | |
710 | .long sys_syslog | |
711 | .long sys_setitimer | |
712 | .long sys_getitimer /* 105 */ | |
713 | .long sys_newstat | |
714 | .long sys_newlstat | |
715 | .long sys_newfstat | |
716 | .long sys_ni_syscall /* old sys_uname holder */ | |
bb1d2a94 | 717 | .long sys_ni_syscall /* 110 */ /* sys_iopl in i386 */ |
1da177e4 LT |
718 | .long sys_vhangup |
719 | .long sys_ni_syscall /* old "idle" system call */ | |
720 | .long sys_ni_syscall /* vm86old in i386 */ | |
721 | .long sys_wait4 | |
722 | .long sys_swapoff /* 115 */ | |
723 | .long sys_sysinfo | |
724 | .long sys_ipc | |
725 | .long sys_fsync | |
726 | .long sys_sigreturn | |
727 | .long sys_clone /* 120 */ | |
728 | .long sys_setdomainname | |
729 | .long sys_newuname | |
730 | .long sys_ni_syscall /* sys_modify_ldt */ | |
731 | .long sys_adjtimex | |
732 | .long sys_mprotect /* 125 */ | |
733 | .long sys_sigprocmask | |
bb1d2a94 | 734 | .long sys_ni_syscall /* old "create_module" */ |
1da177e4 LT |
735 | .long sys_init_module |
736 | .long sys_delete_module | |
737 | .long sys_ni_syscall /* 130: old "get_kernel_syms" */ | |
738 | .long sys_quotactl | |
739 | .long sys_getpgid | |
740 | .long sys_fchdir | |
741 | .long sys_bdflush | |
742 | .long sys_sysfs /* 135 */ | |
743 | .long sys_personality | |
744 | .long sys_ni_syscall /* for afs_syscall */ | |
745 | .long sys_setfsuid16 | |
746 | .long sys_setfsgid16 | |
747 | .long sys_llseek /* 140 */ | |
748 | .long sys_getdents | |
749 | .long sys_select | |
750 | .long sys_flock | |
751 | .long sys_msync | |
752 | .long sys_readv /* 145 */ | |
753 | .long sys_writev | |
754 | .long sys_getsid | |
755 | .long sys_fdatasync | |
756 | .long sys_sysctl | |
757 | .long sys_mlock /* 150 */ | |
758 | .long sys_munlock | |
759 | .long sys_mlockall | |
760 | .long sys_munlockall | |
761 | .long sys_sched_setparam | |
762 | .long sys_sched_getparam /* 155 */ | |
763 | .long sys_sched_setscheduler | |
764 | .long sys_sched_getscheduler | |
765 | .long sys_sched_yield | |
766 | .long sys_sched_get_priority_max | |
767 | .long sys_sched_get_priority_min /* 160 */ | |
768 | .long sys_sched_rr_get_interval | |
769 | .long sys_nanosleep | |
770 | .long sys_mremap | |
771 | .long sys_setresuid16 | |
772 | .long sys_getresuid16 /* 165 */ | |
773 | .long sys_ni_syscall /* sys_vm86 */ | |
774 | .long sys_ni_syscall /* Old sys_query_module */ | |
775 | .long sys_poll | |
f5b94099 | 776 | .long sys_ni_syscall /* old nfsservctl */ |
1da177e4 LT |
777 | .long sys_setresgid16 /* 170 */ |
778 | .long sys_getresgid16 | |
779 | .long sys_prctl | |
780 | .long sys_rt_sigreturn | |
781 | .long sys_rt_sigaction | |
782 | .long sys_rt_sigprocmask /* 175 */ | |
783 | .long sys_rt_sigpending | |
784 | .long sys_rt_sigtimedwait | |
785 | .long sys_rt_sigqueueinfo | |
786 | .long sys_rt_sigsuspend | |
787 | .long sys_pread64 /* 180 */ | |
788 | .long sys_pwrite64 | |
789 | .long sys_chown16 | |
790 | .long sys_getcwd | |
791 | .long sys_capget | |
792 | .long sys_capset /* 185 */ | |
793 | .long sys_sigaltstack | |
794 | .long sys_sendfile | |
795 | .long sys_ni_syscall /* streams1 */ | |
796 | .long sys_ni_syscall /* streams2 */ | |
797 | .long sys_vfork /* 190 */ | |
798 | .long sys_getrlimit | |
bb1d2a94 | 799 | .long sys_mmap2 /* mmap_pgoff */ |
1da177e4 LT |
800 | .long sys_truncate64 |
801 | .long sys_ftruncate64 | |
802 | .long sys_stat64 /* 195 */ | |
803 | .long sys_lstat64 | |
804 | .long sys_fstat64 | |
805 | .long sys_lchown | |
806 | .long sys_getuid | |
807 | .long sys_getgid /* 200 */ | |
808 | .long sys_geteuid | |
809 | .long sys_getegid | |
810 | .long sys_setreuid | |
811 | .long sys_setregid | |
812 | .long sys_getgroups /* 205 */ | |
813 | .long sys_setgroups | |
814 | .long sys_fchown | |
815 | .long sys_setresuid | |
816 | .long sys_getresuid | |
817 | .long sys_setresgid /* 210 */ | |
818 | .long sys_getresgid | |
819 | .long sys_chown | |
820 | .long sys_setuid | |
821 | .long sys_setgid | |
822 | .long sys_setfsuid /* 215 */ | |
823 | .long sys_setfsgid | |
824 | .long sys_pivot_root | |
825 | .long sys_mincore | |
826 | .long sys_madvise | |
827 | .long sys_getdents64 /* 220 */ | |
828 | .long sys_fcntl64 | |
829 | .long sys_ni_syscall /* reserved for TUX */ | |
830 | .long sys_ni_syscall | |
831 | .long sys_gettid | |
832 | .long sys_readahead /* 225 */ | |
833 | .long sys_setxattr | |
834 | .long sys_lsetxattr | |
835 | .long sys_fsetxattr | |
836 | .long sys_getxattr | |
837 | .long sys_lgetxattr /* 230 */ | |
838 | .long sys_fgetxattr | |
839 | .long sys_listxattr | |
840 | .long sys_llistxattr | |
841 | .long sys_flistxattr | |
842 | .long sys_removexattr /* 235 */ | |
843 | .long sys_lremovexattr | |
844 | .long sys_fremovexattr | |
845 | .long sys_tkill | |
846 | .long sys_sendfile64 | |
847 | .long sys_futex /* 240 */ | |
848 | .long sys_sched_setaffinity | |
849 | .long sys_sched_getaffinity | |
850 | .long sys_ni_syscall /* sys_set_thread_area */ | |
851 | .long sys_ni_syscall /* sys_get_thread_area */ | |
852 | .long sys_io_setup /* 245 */ | |
853 | .long sys_io_destroy | |
854 | .long sys_io_getevents | |
855 | .long sys_io_submit | |
856 | .long sys_io_cancel | |
857 | .long sys_fadvise64 /* 250 */ | |
858 | .long sys_ni_syscall | |
859 | .long sys_exit_group | |
860 | .long sys_lookup_dcookie | |
861 | .long sys_epoll_create | |
862 | .long sys_epoll_ctl /* 255 */ | |
863 | .long sys_epoll_wait | |
864 | .long sys_remap_file_pages | |
bb1d2a94 JN |
865 | .long sys_set_tid_address |
866 | .long sys_timer_create | |
867 | .long sys_timer_settime /* 260 */ | |
868 | .long sys_timer_gettime | |
869 | .long sys_timer_getoverrun | |
870 | .long sys_timer_delete | |
871 | .long sys_clock_settime | |
872 | .long sys_clock_gettime /* 265 */ | |
873 | .long sys_clock_getres | |
874 | .long sys_clock_nanosleep | |
1da177e4 | 875 | .long sys_statfs64 |
bb1d2a94 JN |
876 | .long sys_fstatfs64 |
877 | .long sys_tgkill /* 270 */ | |
1da177e4 | 878 | .long sys_utimes |
bb1d2a94 | 879 | .long sys_fadvise64_64 |
1da177e4 LT |
880 | .long sys_ni_syscall /* sys_vserver */ |
881 | .long sys_ni_syscall /* sys_mbind */ | |
882 | .long sys_ni_syscall /* 275 sys_get_mempolicy */ | |
883 | .long sys_ni_syscall /* sys_set_mempolicy */ | |
884 | .long sys_mq_open | |
885 | .long sys_mq_unlink | |
886 | .long sys_mq_timedsend | |
887 | .long sys_mq_timedreceive /* 280 */ | |
888 | .long sys_mq_notify | |
889 | .long sys_mq_getsetattr | |
bb1d2a94 | 890 | .long sys_ni_syscall |
1da177e4 | 891 | .long sys_waitid |
7cf32cad MS |
892 | .long sys_ni_syscall /* 285 */ /* available */ |
893 | .long sys_add_key | |
894 | .long sys_request_key | |
895 | .long sys_keyctl | |
0c3537ff JN |
896 | .long sys_ioprio_set |
897 | .long sys_ioprio_get /* 290 */ | |
898 | .long sys_inotify_init | |
899 | .long sys_inotify_add_watch | |
900 | .long sys_inotify_rm_watch | |
901 | .long sys_migrate_pages | |
902 | .long sys_openat /* 295 */ | |
903 | .long sys_mkdirat | |
904 | .long sys_mknodat | |
905 | .long sys_fchownat | |
906 | .long sys_futimesat | |
907 | .long sys_fstatat64 /* 300 */ | |
908 | .long sys_unlinkat | |
909 | .long sys_renameat | |
910 | .long sys_linkat | |
911 | .long sys_symlinkat | |
912 | .long sys_readlinkat /* 305 */ | |
913 | .long sys_fchmodat | |
914 | .long sys_faccessat | |
915 | .long sys_pselect6 | |
916 | .long sys_ppoll | |
917 | .long sys_unshare /* 310 */ | |
918 | .long sys_set_robust_list | |
919 | .long sys_get_robust_list | |
920 | .long sys_splice | |
921 | .long sys_sync_file_range | |
922 | .long sys_tee /* 315 */ | |
923 | .long sys_vmsplice | |
924 | .long sys_move_pages | |
925 | .long sys_getcpu | |
926 | .long sys_epoll_pwait | |
927 | .long sys_utimensat /* 320 */ | |
928 | .long sys_signalfd | |
7800029d | 929 | .long sys_timerfd_create |
0c3537ff JN |
930 | .long sys_eventfd |
931 | .long sys_fallocate | |
7800029d JN |
932 | .long sys_timerfd_settime /* 325 */ |
933 | .long sys_timerfd_gettime | |
6d3d4be4 JN |
934 | .long sys_signalfd4 |
935 | .long sys_eventfd2 | |
936 | .long sys_epoll_create1 | |
937 | .long sys_dup3 /* 330 */ | |
938 | .long sys_pipe2 | |
939 | .long sys_inotify_init1 | |
940 | .long sys_preadv | |
941 | .long sys_pwritev | |
7b21fddd | 942 | .long sys_setns /* 335 */ |
bb1d2a94 JN |
943 | .long sys_name_to_handle_at |
944 | .long sys_open_by_handle_at | |
945 | .long sys_rt_tgsigqueueinfo | |
946 | .long sys_perf_event_open | |
947 | .long sys_recvmmsg /* 340 */ | |
948 | .long sys_accept4 | |
949 | .long sys_fanotify_init | |
950 | .long sys_fanotify_mark | |
951 | .long sys_prlimit64 | |
952 | .long sys_clock_adjtime /* 345 */ | |
953 | .long sys_syncfs | |
954 | .long sys_sendmmsg | |
955 | .long sys_process_vm_readv | |
956 | .long sys_process_vm_writev | |
957 | .long sys_kcmp /* 350 */ | |
958 | .long sys_finit_module | |
ee59843c CG |
959 | .long sys_sched_setattr |
960 | .long sys_sched_getattr | |
961 | .long sys_renameat2 | |
962 | .long sys_seccomp /* 355 */ | |
963 | .long sys_getrandom | |
964 | .long sys_memfd_create | |
965 | .long sys_bpf | |
966 | .long sys_execveat | |
1da177e4 LT |
967 | |
968 | /* | |
969 | * NOTE!! This doesn't have to be exact - we just have | |
970 | * to make sure we have _enough_ of the "sys_ni_syscall" | |
971 | * entries. Don't panic if you notice that this hasn't | |
972 | * been shrunk every time we add a new system call. | |
973 | */ | |
974 | ||
975 | .rept NR_syscalls-(.-sys_call_table)/4 | |
976 | .long sys_ni_syscall | |
977 | .endr | |
bb1d2a94 | 978 |