diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/kernel/entry-armv.S |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/arm/kernel/entry-armv.S')
-rw-r--r-- | arch/arm/kernel/entry-armv.S | 745 |
1 files changed, 745 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S new file mode 100644 index 000000000000..bb27c317d94b --- /dev/null +++ b/arch/arm/kernel/entry-armv.S | |||
@@ -0,0 +1,745 @@ | |||
1 | /* | ||
2 | * linux/arch/arm/kernel/entry-armv.S | ||
3 | * | ||
4 | * Copyright (C) 1996,1997,1998 Russell King. | ||
5 | * ARM700 fix by Matthew Godbolt (linux-user@willothewisp.demon.co.uk) | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * Low-level vector interface routines | ||
12 | * | ||
13 | * Note: there is a StrongARM bug in the STMIA rn, {regs}^ instruction that causes | ||
14 | * it to save wrong values... Be aware! | ||
15 | */ | ||
16 | #include <linux/config.h> | ||
17 | #include <linux/init.h> | ||
18 | |||
19 | #include <asm/thread_info.h> | ||
20 | #include <asm/glue.h> | ||
21 | #include <asm/ptrace.h> | ||
22 | #include <asm/vfpmacros.h> | ||
23 | |||
24 | #include "entry-header.S" | ||
25 | |||
26 | /* | ||
27 | * Invalid mode handlers | ||
28 | */ | ||
29 | .macro inv_entry, sym, reason | ||
30 | sub sp, sp, #S_FRAME_SIZE @ Allocate frame size in one go | ||
31 | stmia sp, {r0 - lr} @ Save XXX r0 - lr | ||
32 | ldr r4, .LC\sym | ||
33 | mov r1, #\reason | ||
34 | .endm | ||
35 | |||
36 | __pabt_invalid: | ||
37 | inv_entry abt, BAD_PREFETCH | ||
38 | b 1f | ||
39 | |||
40 | __dabt_invalid: | ||
41 | inv_entry abt, BAD_DATA | ||
42 | b 1f | ||
43 | |||
44 | __irq_invalid: | ||
45 | inv_entry irq, BAD_IRQ | ||
46 | b 1f | ||
47 | |||
48 | __und_invalid: | ||
49 | inv_entry und, BAD_UNDEFINSTR | ||
50 | |||
51 | 1: zero_fp | ||
52 | ldmia r4, {r5 - r7} @ Get XXX pc, cpsr, old_r0 | ||
53 | add r4, sp, #S_PC | ||
54 | stmia r4, {r5 - r7} @ Save XXX pc, cpsr, old_r0 | ||
55 | mov r0, sp | ||
56 | and r2, r6, #31 @ int mode | ||
57 | b bad_mode | ||
58 | |||
59 | /* | ||
60 | * SVC mode handlers | ||
61 | */ | ||
62 | .macro svc_entry, sym | ||
63 | sub sp, sp, #S_FRAME_SIZE | ||
64 | stmia sp, {r0 - r12} @ save r0 - r12 | ||
65 | ldr r2, .LC\sym | ||
66 | add r0, sp, #S_FRAME_SIZE | ||
67 | ldmia r2, {r2 - r4} @ get pc, cpsr | ||
68 | add r5, sp, #S_SP | ||
69 | mov r1, lr | ||
70 | |||
71 | @ | ||
72 | @ We are now ready to fill in the remaining blanks on the stack: | ||
73 | @ | ||
74 | @ r0 - sp_svc | ||
75 | @ r1 - lr_svc | ||
76 | @ r2 - lr_<exception>, already fixed up for correct return/restart | ||
77 | @ r3 - spsr_<exception> | ||
78 | @ r4 - orig_r0 (see pt_regs definition in ptrace.h) | ||
79 | @ | ||
80 | stmia r5, {r0 - r4} | ||
81 | .endm | ||
82 | |||
83 | .align 5 | ||
84 | __dabt_svc: | ||
85 | svc_entry abt | ||
86 | |||
87 | @ | ||
88 | @ get ready to re-enable interrupts if appropriate | ||
89 | @ | ||
90 | mrs r9, cpsr | ||
91 | tst r3, #PSR_I_BIT | ||
92 | biceq r9, r9, #PSR_I_BIT | ||
93 | |||
94 | @ | ||
95 | @ Call the processor-specific abort handler: | ||
96 | @ | ||
97 | @ r2 - aborted context pc | ||
98 | @ r3 - aborted context cpsr | ||
99 | @ | ||
100 | @ The abort handler must return the aborted address in r0, and | ||
101 | @ the fault status register in r1. r9 must be preserved. | ||
102 | @ | ||
103 | #ifdef MULTI_ABORT | ||
104 | ldr r4, .LCprocfns | ||
105 | mov lr, pc | ||
106 | ldr pc, [r4] | ||
107 | #else | ||
108 | bl CPU_ABORT_HANDLER | ||
109 | #endif | ||
110 | |||
111 | @ | ||
112 | @ set desired IRQ state, then call main handler | ||
113 | @ | ||
114 | msr cpsr_c, r9 | ||
115 | mov r2, sp | ||
116 | bl do_DataAbort | ||
117 | |||
118 | @ | ||
119 | @ IRQs off again before pulling preserved data off the stack | ||
120 | @ | ||
121 | disable_irq r0 | ||
122 | |||
123 | @ | ||
124 | @ restore SPSR and restart the instruction | ||
125 | @ | ||
126 | ldr r0, [sp, #S_PSR] | ||
127 | msr spsr_cxsf, r0 | ||
128 | ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr | ||
129 | |||
130 | .align 5 | ||
131 | __irq_svc: | ||
132 | svc_entry irq | ||
133 | #ifdef CONFIG_PREEMPT | ||
134 | get_thread_info r8 | ||
135 | ldr r9, [r8, #TI_PREEMPT] @ get preempt count | ||
136 | add r7, r9, #1 @ increment it | ||
137 | str r7, [r8, #TI_PREEMPT] | ||
138 | #endif | ||
139 | 1: get_irqnr_and_base r0, r6, r5, lr | ||
140 | movne r1, sp | ||
141 | @ | ||
142 | @ routine called with r0 = irq number, r1 = struct pt_regs * | ||
143 | @ | ||
144 | adrne lr, 1b | ||
145 | bne asm_do_IRQ | ||
146 | #ifdef CONFIG_PREEMPT | ||
147 | ldr r0, [r8, #TI_FLAGS] @ get flags | ||
148 | tst r0, #_TIF_NEED_RESCHED | ||
149 | blne svc_preempt | ||
150 | preempt_return: | ||
151 | ldr r0, [r8, #TI_PREEMPT] @ read preempt value | ||
152 | teq r0, r7 | ||
153 | str r9, [r8, #TI_PREEMPT] @ restore preempt count | ||
154 | strne r0, [r0, -r0] @ bug() | ||
155 | #endif | ||
156 | ldr r0, [sp, #S_PSR] @ irqs are already disabled | ||
157 | msr spsr_cxsf, r0 | ||
158 | ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr | ||
159 | |||
160 | .ltorg | ||
161 | |||
162 | #ifdef CONFIG_PREEMPT | ||
163 | svc_preempt: | ||
164 | teq r9, #0 @ was preempt count = 0 | ||
165 | ldreq r6, .LCirq_stat | ||
166 | movne pc, lr @ no | ||
167 | ldr r0, [r6, #4] @ local_irq_count | ||
168 | ldr r1, [r6, #8] @ local_bh_count | ||
169 | adds r0, r0, r1 | ||
170 | movne pc, lr | ||
171 | mov r7, #0 @ preempt_schedule_irq | ||
172 | str r7, [r8, #TI_PREEMPT] @ expects preempt_count == 0 | ||
173 | 1: bl preempt_schedule_irq @ irq en/disable is done inside | ||
174 | ldr r0, [r8, #TI_FLAGS] @ get new tasks TI_FLAGS | ||
175 | tst r0, #_TIF_NEED_RESCHED | ||
176 | beq preempt_return @ go again | ||
177 | b 1b | ||
178 | #endif | ||
179 | |||
180 | .align 5 | ||
181 | __und_svc: | ||
182 | svc_entry und | ||
183 | |||
184 | @ | ||
185 | @ call emulation code, which returns using r9 if it has emulated | ||
186 | @ the instruction, or the more conventional lr if we are to treat | ||
187 | @ this as a real undefined instruction | ||
188 | @ | ||
189 | @ r0 - instruction | ||
190 | @ | ||
191 | ldr r0, [r2, #-4] | ||
192 | adr r9, 1f | ||
193 | bl call_fpe | ||
194 | |||
195 | mov r0, sp @ struct pt_regs *regs | ||
196 | bl do_undefinstr | ||
197 | |||
198 | @ | ||
199 | @ IRQs off again before pulling preserved data off the stack | ||
200 | @ | ||
201 | 1: disable_irq r0 | ||
202 | |||
203 | @ | ||
204 | @ restore SPSR and restart the instruction | ||
205 | @ | ||
206 | ldr lr, [sp, #S_PSR] @ Get SVC cpsr | ||
207 | msr spsr_cxsf, lr | ||
208 | ldmia sp, {r0 - pc}^ @ Restore SVC registers | ||
209 | |||
210 | .align 5 | ||
211 | __pabt_svc: | ||
212 | svc_entry abt | ||
213 | |||
214 | @ | ||
215 | @ re-enable interrupts if appropriate | ||
216 | @ | ||
217 | mrs r9, cpsr | ||
218 | tst r3, #PSR_I_BIT | ||
219 | biceq r9, r9, #PSR_I_BIT | ||
220 | msr cpsr_c, r9 | ||
221 | |||
222 | @ | ||
223 | @ set args, then call main handler | ||
224 | @ | ||
225 | @ r0 - address of faulting instruction | ||
226 | @ r1 - pointer to registers on stack | ||
227 | @ | ||
228 | mov r0, r2 @ address (pc) | ||
229 | mov r1, sp @ regs | ||
230 | bl do_PrefetchAbort @ call abort handler | ||
231 | |||
232 | @ | ||
233 | @ IRQs off again before pulling preserved data off the stack | ||
234 | @ | ||
235 | disable_irq r0 | ||
236 | |||
237 | @ | ||
238 | @ restore SPSR and restart the instruction | ||
239 | @ | ||
240 | ldr r0, [sp, #S_PSR] | ||
241 | msr spsr_cxsf, r0 | ||
242 | ldmia sp, {r0 - pc}^ @ load r0 - pc, cpsr | ||
243 | |||
244 | .align 5 | ||
245 | .LCirq: | ||
246 | .word __temp_irq | ||
247 | .LCund: | ||
248 | .word __temp_und | ||
249 | .LCabt: | ||
250 | .word __temp_abt | ||
251 | #ifdef MULTI_ABORT | ||
252 | .LCprocfns: | ||
253 | .word processor | ||
254 | #endif | ||
255 | .LCfp: | ||
256 | .word fp_enter | ||
257 | #ifdef CONFIG_PREEMPT | ||
258 | .LCirq_stat: | ||
259 | .word irq_stat | ||
260 | #endif | ||
261 | |||
262 | /* | ||
263 | * User mode handlers | ||
264 | */ | ||
265 | .macro usr_entry, sym | ||
266 | sub sp, sp, #S_FRAME_SIZE @ Allocate frame size in one go | ||
267 | stmia sp, {r0 - r12} @ save r0 - r12 | ||
268 | ldr r7, .LC\sym | ||
269 | add r5, sp, #S_PC | ||
270 | ldmia r7, {r2 - r4} @ Get USR pc, cpsr | ||
271 | |||
272 | @ | ||
273 | @ We are now ready to fill in the remaining blanks on the stack: | ||
274 | @ | ||
275 | @ r2 - lr_<exception>, already fixed up for correct return/restart | ||
276 | @ r3 - spsr_<exception> | ||
277 | @ r4 - orig_r0 (see pt_regs definition in ptrace.h) | ||
278 | @ | ||
279 | @ Also, separately save sp_usr and lr_usr | ||
280 | @ | ||
281 | stmia r5, {r2 - r4} | ||
282 | stmdb r5, {sp, lr}^ | ||
283 | |||
284 | @ | ||
285 | @ Enable the alignment trap while in kernel mode | ||
286 | @ | ||
287 | alignment_trap r7, r0, __temp_\sym | ||
288 | |||
289 | @ | ||
290 | @ Clear FP to mark the first stack frame | ||
291 | @ | ||
292 | zero_fp | ||
293 | .endm | ||
294 | |||
295 | .align 5 | ||
296 | __dabt_usr: | ||
297 | usr_entry abt | ||
298 | |||
299 | @ | ||
300 | @ Call the processor-specific abort handler: | ||
301 | @ | ||
302 | @ r2 - aborted context pc | ||
303 | @ r3 - aborted context cpsr | ||
304 | @ | ||
305 | @ The abort handler must return the aborted address in r0, and | ||
306 | @ the fault status register in r1. | ||
307 | @ | ||
308 | #ifdef MULTI_ABORT | ||
309 | ldr r4, .LCprocfns | ||
310 | mov lr, pc | ||
311 | ldr pc, [r4] | ||
312 | #else | ||
313 | bl CPU_ABORT_HANDLER | ||
314 | #endif | ||
315 | |||
316 | @ | ||
317 | @ IRQs on, then call the main handler | ||
318 | @ | ||
319 | enable_irq r2 | ||
320 | mov r2, sp | ||
321 | adr lr, ret_from_exception | ||
322 | b do_DataAbort | ||
323 | |||
324 | .align 5 | ||
325 | __irq_usr: | ||
326 | usr_entry irq | ||
327 | |||
328 | #ifdef CONFIG_PREEMPT | ||
329 | get_thread_info r8 | ||
330 | ldr r9, [r8, #TI_PREEMPT] @ get preempt count | ||
331 | add r7, r9, #1 @ increment it | ||
332 | str r7, [r8, #TI_PREEMPT] | ||
333 | #endif | ||
334 | 1: get_irqnr_and_base r0, r6, r5, lr | ||
335 | movne r1, sp | ||
336 | adrne lr, 1b | ||
337 | @ | ||
338 | @ routine called with r0 = irq number, r1 = struct pt_regs * | ||
339 | @ | ||
340 | bne asm_do_IRQ | ||
341 | #ifdef CONFIG_PREEMPT | ||
342 | ldr r0, [r8, #TI_PREEMPT] | ||
343 | teq r0, r7 | ||
344 | str r9, [r8, #TI_PREEMPT] | ||
345 | strne r0, [r0, -r0] | ||
346 | mov tsk, r8 | ||
347 | #else | ||
348 | get_thread_info tsk | ||
349 | #endif | ||
350 | mov why, #0 | ||
351 | b ret_to_user | ||
352 | |||
353 | .ltorg | ||
354 | |||
355 | .align 5 | ||
356 | __und_usr: | ||
357 | usr_entry und | ||
358 | |||
359 | tst r3, #PSR_T_BIT @ Thumb mode? | ||
360 | bne fpundefinstr @ ignore FP | ||
361 | sub r4, r2, #4 | ||
362 | |||
363 | @ | ||
364 | @ fall through to the emulation code, which returns using r9 if | ||
365 | @ it has emulated the instruction, or the more conventional lr | ||
366 | @ if we are to treat this as a real undefined instruction | ||
367 | @ | ||
368 | @ r0 - instruction | ||
369 | @ | ||
370 | 1: ldrt r0, [r4] | ||
371 | adr r9, ret_from_exception | ||
372 | adr lr, fpundefinstr | ||
373 | @ | ||
374 | @ fallthrough to call_fpe | ||
375 | @ | ||
376 | |||
377 | /* | ||
378 | * The out of line fixup for the ldrt above. | ||
379 | */ | ||
380 | .section .fixup, "ax" | ||
381 | 2: mov pc, r9 | ||
382 | .previous | ||
383 | .section __ex_table,"a" | ||
384 | .long 1b, 2b | ||
385 | .previous | ||
386 | |||
387 | /* | ||
388 | * Check whether the instruction is a co-processor instruction. | ||
389 | * If yes, we need to call the relevant co-processor handler. | ||
390 | * | ||
391 | * Note that we don't do a full check here for the co-processor | ||
392 | * instructions; all instructions with bit 27 set are well | ||
393 | * defined. The only instructions that should fault are the | ||
394 | * co-processor instructions. However, we have to watch out | ||
395 | * for the ARM6/ARM7 SWI bug. | ||
396 | * | ||
397 | * Emulators may wish to make use of the following registers: | ||
398 | * r0 = instruction opcode. | ||
399 | * r2 = PC+4 | ||
400 | * r10 = this threads thread_info structure. | ||
401 | */ | ||
402 | call_fpe: | ||
403 | tst r0, #0x08000000 @ only CDP/CPRT/LDC/STC have bit 27 | ||
404 | #if defined(CONFIG_CPU_ARM610) || defined(CONFIG_CPU_ARM710) | ||
405 | and r8, r0, #0x0f000000 @ mask out op-code bits | ||
406 | teqne r8, #0x0f000000 @ SWI (ARM6/7 bug)? | ||
407 | #endif | ||
408 | moveq pc, lr | ||
409 | get_thread_info r10 @ get current thread | ||
410 | and r8, r0, #0x00000f00 @ mask out CP number | ||
411 | mov r7, #1 | ||
412 | add r6, r10, #TI_USED_CP | ||
413 | strb r7, [r6, r8, lsr #8] @ set appropriate used_cp[] | ||
414 | #ifdef CONFIG_IWMMXT | ||
415 | @ Test if we need to give access to iWMMXt coprocessors | ||
416 | ldr r5, [r10, #TI_FLAGS] | ||
417 | rsbs r7, r8, #(1 << 8) @ CP 0 or 1 only | ||
418 | movcss r7, r5, lsr #(TIF_USING_IWMMXT + 1) | ||
419 | bcs iwmmxt_task_enable | ||
420 | #endif | ||
421 | enable_irq r7 | ||
422 | add pc, pc, r8, lsr #6 | ||
423 | mov r0, r0 | ||
424 | |||
425 | mov pc, lr @ CP#0 | ||
426 | b do_fpe @ CP#1 (FPE) | ||
427 | b do_fpe @ CP#2 (FPE) | ||
428 | mov pc, lr @ CP#3 | ||
429 | mov pc, lr @ CP#4 | ||
430 | mov pc, lr @ CP#5 | ||
431 | mov pc, lr @ CP#6 | ||
432 | mov pc, lr @ CP#7 | ||
433 | mov pc, lr @ CP#8 | ||
434 | mov pc, lr @ CP#9 | ||
435 | #ifdef CONFIG_VFP | ||
436 | b do_vfp @ CP#10 (VFP) | ||
437 | b do_vfp @ CP#11 (VFP) | ||
438 | #else | ||
439 | mov pc, lr @ CP#10 (VFP) | ||
440 | mov pc, lr @ CP#11 (VFP) | ||
441 | #endif | ||
442 | mov pc, lr @ CP#12 | ||
443 | mov pc, lr @ CP#13 | ||
444 | mov pc, lr @ CP#14 (Debug) | ||
445 | mov pc, lr @ CP#15 (Control) | ||
446 | |||
447 | do_fpe: | ||
448 | ldr r4, .LCfp | ||
449 | add r10, r10, #TI_FPSTATE @ r10 = workspace | ||
450 | ldr pc, [r4] @ Call FP module USR entry point | ||
451 | |||
452 | /* | ||
453 | * The FP module is called with these registers set: | ||
454 | * r0 = instruction | ||
455 | * r2 = PC+4 | ||
456 | * r9 = normal "successful" return address | ||
457 | * r10 = FP workspace | ||
458 | * lr = unrecognised FP instruction return address | ||
459 | */ | ||
460 | |||
461 | .data | ||
462 | ENTRY(fp_enter) | ||
463 | .word fpundefinstr | ||
464 | .text | ||
465 | |||
466 | fpundefinstr: | ||
467 | mov r0, sp | ||
468 | adr lr, ret_from_exception | ||
469 | b do_undefinstr | ||
470 | |||
471 | .align 5 | ||
472 | __pabt_usr: | ||
473 | usr_entry abt | ||
474 | |||
475 | enable_irq r0 @ Enable interrupts | ||
476 | mov r0, r2 @ address (pc) | ||
477 | mov r1, sp @ regs | ||
478 | bl do_PrefetchAbort @ call abort handler | ||
479 | /* fall through */ | ||
480 | /* | ||
481 | * This is the return code to user mode for abort handlers | ||
482 | */ | ||
483 | ENTRY(ret_from_exception) | ||
484 | get_thread_info tsk | ||
485 | mov why, #0 | ||
486 | b ret_to_user | ||
487 | |||
488 | /* | ||
489 | * Register switch for ARMv3 and ARMv4 processors | ||
490 | * r0 = previous task_struct, r1 = previous thread_info, r2 = next thread_info | ||
491 | * previous and next are guaranteed not to be the same. | ||
492 | */ | ||
493 | ENTRY(__switch_to) | ||
494 | add ip, r1, #TI_CPU_SAVE | ||
495 | ldr r3, [r2, #TI_TP_VALUE] | ||
496 | stmia ip!, {r4 - sl, fp, sp, lr} @ Store most regs on stack | ||
497 | ldr r6, [r2, #TI_CPU_DOMAIN]! | ||
498 | #if defined(CONFIG_CPU_XSCALE) && !defined(CONFIG_IWMMXT) | ||
499 | mra r4, r5, acc0 | ||
500 | stmia ip, {r4, r5} | ||
501 | #endif | ||
502 | mov r4, #0xffff0fff | ||
503 | str r3, [r4, #-3] @ Set TLS ptr | ||
504 | mcr p15, 0, r6, c3, c0, 0 @ Set domain register | ||
505 | #ifdef CONFIG_VFP | ||
506 | @ Always disable VFP so we can lazily save/restore the old | ||
507 | @ state. This occurs in the context of the previous thread. | ||
508 | VFPFMRX r4, FPEXC | ||
509 | bic r4, r4, #FPEXC_ENABLE | ||
510 | VFPFMXR FPEXC, r4 | ||
511 | #endif | ||
512 | #if defined(CONFIG_IWMMXT) | ||
513 | bl iwmmxt_task_switch | ||
514 | #elif defined(CONFIG_CPU_XSCALE) | ||
515 | add r4, r2, #40 @ cpu_context_save->extra | ||
516 | ldmib r4, {r4, r5} | ||
517 | mar acc0, r4, r5 | ||
518 | #endif | ||
519 | ldmib r2, {r4 - sl, fp, sp, pc} @ Load all regs saved previously | ||
520 | |||
521 | __INIT | ||
522 | /* | ||
523 | * Vector stubs. | ||
524 | * | ||
525 | * This code is copied to 0x200 or 0xffff0200 so we can use branches in the | ||
526 | * vectors, rather than ldr's. | ||
527 | * | ||
528 | * Common stub entry macro: | ||
529 | * Enter in IRQ mode, spsr = SVC/USR CPSR, lr = SVC/USR PC | ||
530 | */ | ||
531 | .macro vector_stub, name, sym, correction=0 | ||
532 | .align 5 | ||
533 | |||
534 | vector_\name: | ||
535 | ldr r13, .LCs\sym | ||
536 | .if \correction | ||
537 | sub lr, lr, #\correction | ||
538 | .endif | ||
539 | str lr, [r13] @ save lr_IRQ | ||
540 | mrs lr, spsr | ||
541 | str lr, [r13, #4] @ save spsr_IRQ | ||
542 | @ | ||
543 | @ now branch to the relevant MODE handling routine | ||
544 | @ | ||
545 | mrs r13, cpsr | ||
546 | bic r13, r13, #MODE_MASK | ||
547 | orr r13, r13, #MODE_SVC | ||
548 | msr spsr_cxsf, r13 @ switch to SVC_32 mode | ||
549 | |||
550 | and lr, lr, #15 | ||
551 | ldr lr, [pc, lr, lsl #2] | ||
552 | movs pc, lr @ Changes mode and branches | ||
553 | .endm | ||
554 | |||
555 | __stubs_start: | ||
556 | /* | ||
557 | * Interrupt dispatcher | ||
558 | */ | ||
559 | vector_stub irq, irq, 4 | ||
560 | |||
561 | .long __irq_usr @ 0 (USR_26 / USR_32) | ||
562 | .long __irq_invalid @ 1 (FIQ_26 / FIQ_32) | ||
563 | .long __irq_invalid @ 2 (IRQ_26 / IRQ_32) | ||
564 | .long __irq_svc @ 3 (SVC_26 / SVC_32) | ||
565 | .long __irq_invalid @ 4 | ||
566 | .long __irq_invalid @ 5 | ||
567 | .long __irq_invalid @ 6 | ||
568 | .long __irq_invalid @ 7 | ||
569 | .long __irq_invalid @ 8 | ||
570 | .long __irq_invalid @ 9 | ||
571 | .long __irq_invalid @ a | ||
572 | .long __irq_invalid @ b | ||
573 | .long __irq_invalid @ c | ||
574 | .long __irq_invalid @ d | ||
575 | .long __irq_invalid @ e | ||
576 | .long __irq_invalid @ f | ||
577 | |||
578 | /* | ||
579 | * Data abort dispatcher | ||
580 | * Enter in ABT mode, spsr = USR CPSR, lr = USR PC | ||
581 | */ | ||
582 | vector_stub dabt, abt, 8 | ||
583 | |||
584 | .long __dabt_usr @ 0 (USR_26 / USR_32) | ||
585 | .long __dabt_invalid @ 1 (FIQ_26 / FIQ_32) | ||
586 | .long __dabt_invalid @ 2 (IRQ_26 / IRQ_32) | ||
587 | .long __dabt_svc @ 3 (SVC_26 / SVC_32) | ||
588 | .long __dabt_invalid @ 4 | ||
589 | .long __dabt_invalid @ 5 | ||
590 | .long __dabt_invalid @ 6 | ||
591 | .long __dabt_invalid @ 7 | ||
592 | .long __dabt_invalid @ 8 | ||
593 | .long __dabt_invalid @ 9 | ||
594 | .long __dabt_invalid @ a | ||
595 | .long __dabt_invalid @ b | ||
596 | .long __dabt_invalid @ c | ||
597 | .long __dabt_invalid @ d | ||
598 | .long __dabt_invalid @ e | ||
599 | .long __dabt_invalid @ f | ||
600 | |||
601 | /* | ||
602 | * Prefetch abort dispatcher | ||
603 | * Enter in ABT mode, spsr = USR CPSR, lr = USR PC | ||
604 | */ | ||
605 | vector_stub pabt, abt, 4 | ||
606 | |||
607 | .long __pabt_usr @ 0 (USR_26 / USR_32) | ||
608 | .long __pabt_invalid @ 1 (FIQ_26 / FIQ_32) | ||
609 | .long __pabt_invalid @ 2 (IRQ_26 / IRQ_32) | ||
610 | .long __pabt_svc @ 3 (SVC_26 / SVC_32) | ||
611 | .long __pabt_invalid @ 4 | ||
612 | .long __pabt_invalid @ 5 | ||
613 | .long __pabt_invalid @ 6 | ||
614 | .long __pabt_invalid @ 7 | ||
615 | .long __pabt_invalid @ 8 | ||
616 | .long __pabt_invalid @ 9 | ||
617 | .long __pabt_invalid @ a | ||
618 | .long __pabt_invalid @ b | ||
619 | .long __pabt_invalid @ c | ||
620 | .long __pabt_invalid @ d | ||
621 | .long __pabt_invalid @ e | ||
622 | .long __pabt_invalid @ f | ||
623 | |||
624 | /* | ||
625 | * Undef instr entry dispatcher | ||
626 | * Enter in UND mode, spsr = SVC/USR CPSR, lr = SVC/USR PC | ||
627 | */ | ||
628 | vector_stub und, und | ||
629 | |||
630 | .long __und_usr @ 0 (USR_26 / USR_32) | ||
631 | .long __und_invalid @ 1 (FIQ_26 / FIQ_32) | ||
632 | .long __und_invalid @ 2 (IRQ_26 / IRQ_32) | ||
633 | .long __und_svc @ 3 (SVC_26 / SVC_32) | ||
634 | .long __und_invalid @ 4 | ||
635 | .long __und_invalid @ 5 | ||
636 | .long __und_invalid @ 6 | ||
637 | .long __und_invalid @ 7 | ||
638 | .long __und_invalid @ 8 | ||
639 | .long __und_invalid @ 9 | ||
640 | .long __und_invalid @ a | ||
641 | .long __und_invalid @ b | ||
642 | .long __und_invalid @ c | ||
643 | .long __und_invalid @ d | ||
644 | .long __und_invalid @ e | ||
645 | .long __und_invalid @ f | ||
646 | |||
647 | .align 5 | ||
648 | |||
649 | /*============================================================================= | ||
650 | * Undefined FIQs | ||
651 | *----------------------------------------------------------------------------- | ||
652 | * Enter in FIQ mode, spsr = ANY CPSR, lr = ANY PC | ||
653 | * MUST PRESERVE SVC SPSR, but need to switch to SVC mode to show our msg. | ||
654 | * Basically to switch modes, we *HAVE* to clobber one register... brain | ||
655 | * damage alert! I don't think that we can execute any code in here in any | ||
656 | * other mode than FIQ... Ok you can switch to another mode, but you can't | ||
657 | * get out of that mode without clobbering one register. | ||
658 | */ | ||
659 | vector_fiq: | ||
660 | disable_fiq | ||
661 | subs pc, lr, #4 | ||
662 | |||
663 | /*============================================================================= | ||
664 | * Address exception handler | ||
665 | *----------------------------------------------------------------------------- | ||
666 | * These aren't too critical. | ||
667 | * (they're not supposed to happen, and won't happen in 32-bit data mode). | ||
668 | */ | ||
669 | |||
670 | vector_addrexcptn: | ||
671 | b vector_addrexcptn | ||
672 | |||
673 | /* | ||
674 | * We group all the following data together to optimise | ||
675 | * for CPUs with separate I & D caches. | ||
676 | */ | ||
677 | .align 5 | ||
678 | |||
679 | .LCvswi: | ||
680 | .word vector_swi | ||
681 | |||
682 | .LCsirq: | ||
683 | .word __temp_irq | ||
684 | .LCsund: | ||
685 | .word __temp_und | ||
686 | .LCsabt: | ||
687 | .word __temp_abt | ||
688 | |||
689 | __stubs_end: | ||
690 | |||
691 | .equ __real_stubs_start, .LCvectors + 0x200 | ||
692 | |||
693 | .LCvectors: | ||
694 | swi SYS_ERROR0 | ||
695 | b __real_stubs_start + (vector_und - __stubs_start) | ||
696 | ldr pc, __real_stubs_start + (.LCvswi - __stubs_start) | ||
697 | b __real_stubs_start + (vector_pabt - __stubs_start) | ||
698 | b __real_stubs_start + (vector_dabt - __stubs_start) | ||
699 | b __real_stubs_start + (vector_addrexcptn - __stubs_start) | ||
700 | b __real_stubs_start + (vector_irq - __stubs_start) | ||
701 | b __real_stubs_start + (vector_fiq - __stubs_start) | ||
702 | |||
703 | ENTRY(__trap_init) | ||
704 | stmfd sp!, {r4 - r6, lr} | ||
705 | |||
706 | mov r0, #0xff000000 | ||
707 | orr r0, r0, #0x00ff0000 @ high vectors position | ||
708 | adr r1, .LCvectors @ set up the vectors | ||
709 | ldmia r1, {r1, r2, r3, r4, r5, r6, ip, lr} | ||
710 | stmia r0, {r1, r2, r3, r4, r5, r6, ip, lr} | ||
711 | |||
712 | add r2, r0, #0x200 | ||
713 | adr r0, __stubs_start @ copy stubs to 0x200 | ||
714 | adr r1, __stubs_end | ||
715 | 1: ldr r3, [r0], #4 | ||
716 | str r3, [r2], #4 | ||
717 | cmp r0, r1 | ||
718 | blt 1b | ||
719 | LOADREGS(fd, sp!, {r4 - r6, pc}) | ||
720 | |||
721 | .data | ||
722 | |||
723 | /* | ||
724 | * Do not reorder these, and do not insert extra data between... | ||
725 | */ | ||
726 | |||
727 | __temp_irq: | ||
728 | .word 0 @ saved lr_irq | ||
729 | .word 0 @ saved spsr_irq | ||
730 | .word -1 @ old_r0 | ||
731 | __temp_und: | ||
732 | .word 0 @ Saved lr_und | ||
733 | .word 0 @ Saved spsr_und | ||
734 | .word -1 @ old_r0 | ||
735 | __temp_abt: | ||
736 | .word 0 @ Saved lr_abt | ||
737 | .word 0 @ Saved spsr_abt | ||
738 | .word -1 @ old_r0 | ||
739 | |||
740 | .globl cr_alignment | ||
741 | .globl cr_no_alignment | ||
742 | cr_alignment: | ||
743 | .space 4 | ||
744 | cr_no_alignment: | ||
745 | .space 4 | ||