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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/boot/compressed/head.S
3 *
4 * Copyright (C) 1996-2002 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/config.h>
11#include <linux/linkage.h>
12
13/*
14 * Debugging stuff
15 *
16 * Note that these macros must not contain any code which is not
17 * 100% relocatable. Any attempt to do so will result in a crash.
18 * Please select one of the following when turning on debugging.
19 */
20#ifdef DEBUG
Russell King5cd0c342005-05-03 12:18:46 +010021
Russell King5cd0c342005-05-03 12:18:46 +010022#if defined(CONFIG_DEBUG_ICEDCC)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 .macro loadsp, rb
24 .endm
Russell King224b5be2005-11-16 14:59:51 +000025 .macro writeb, ch, rb
Russell King5cd0c342005-05-03 12:18:46 +010026 mcr p14, 0, \ch, c0, c1, 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 .endm
Russell King5cd0c342005-05-03 12:18:46 +010028#else
Russell King224b5be2005-11-16 14:59:51 +000029
30#include <asm/arch/debug-macro.S>
31
Russell King5cd0c342005-05-03 12:18:46 +010032 .macro writeb, ch, rb
33 senduart \ch, \rb
34 .endm
35
Russell King224b5be2005-11-16 14:59:51 +000036#if defined(CONFIG_ARCH_SA1100)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 .macro loadsp, rb
38 mov \rb, #0x80000000 @ physical base address
Russell King224b5be2005-11-16 14:59:51 +000039#ifdef CONFIG_DEBUG_LL_SER3
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 add \rb, \rb, #0x00050000 @ Ser3
Russell King224b5be2005-11-16 14:59:51 +000041#else
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 add \rb, \rb, #0x00010000 @ Ser1
Russell King224b5be2005-11-16 14:59:51 +000043#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#elif defined(CONFIG_ARCH_IOP331)
46 .macro loadsp, rb
47 mov \rb, #0xff000000
48 orr \rb, \rb, #0x00ff0000
49 orr \rb, \rb, #0x0000f700 @ location of the UART
50 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#elif defined(CONFIG_ARCH_S3C2410)
Russell King5cd0c342005-05-03 12:18:46 +010052 .macro loadsp, rb
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 mov \rb, #0x50000000
54 add \rb, \rb, #0x4000 * CONFIG_S3C2410_LOWLEVEL_UART_PORT
55 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#else
Russell King224b5be2005-11-16 14:59:51 +000057 .macro loadsp, rb
58 addruart \rb
59 .endm
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#endif
61#endif
Russell King5cd0c342005-05-03 12:18:46 +010062#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 .macro kputc,val
65 mov r0, \val
66 bl putc
67 .endm
68
69 .macro kphex,val,len
70 mov r0, \val
71 mov r1, #\len
72 bl phex
73 .endm
74
75 .macro debug_reloc_start
76#ifdef DEBUG
77 kputc #'\n'
78 kphex r6, 8 /* processor id */
79 kputc #':'
80 kphex r7, 8 /* architecture id */
81 kputc #':'
82 mrc p15, 0, r0, c1, c0
83 kphex r0, 8 /* control reg */
84 kputc #'\n'
85 kphex r5, 8 /* decompressed kernel start */
86 kputc #'-'
Russell Kingf4619022006-01-12 17:17:57 +000087 kphex r9, 8 /* decompressed kernel end */
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 kputc #'>'
89 kphex r4, 8 /* kernel execution address */
90 kputc #'\n'
91#endif
92 .endm
93
94 .macro debug_reloc_end
95#ifdef DEBUG
96 kphex r5, 8 /* end of kernel */
97 kputc #'\n'
98 mov r0, r4
99 bl memdump /* dump 256 bytes at start of kernel */
100#endif
101 .endm
102
103 .section ".start", #alloc, #execinstr
104/*
105 * sort out different calling conventions
106 */
107 .align
108start:
109 .type start,#function
110 .rept 8
111 mov r0, r0
112 .endr
113
114 b 1f
115 .word 0x016f2818 @ Magic numbers to help the loader
116 .word start @ absolute load/run zImage address
117 .word _edata @ zImage end address
1181: mov r7, r1 @ save architecture ID
Russell Kingf4619022006-01-12 17:17:57 +0000119 mov r8, r2 @ save atags pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121#ifndef __ARM_ARCH_2__
122 /*
123 * Booting from Angel - need to enter SVC mode and disable
124 * FIQs/IRQs (numeric definitions from angel arm.h source).
125 * We only do this if we were in user mode on entry.
126 */
127 mrs r2, cpsr @ get current mode
128 tst r2, #3 @ not user?
129 bne not_angel
130 mov r0, #0x17 @ angel_SWIreason_EnterSVC
131 swi 0x123456 @ angel_SWI_ARM
132not_angel:
133 mrs r2, cpsr @ turn off interrupts to
134 orr r2, r2, #0xc0 @ prevent angel from running
135 msr cpsr_c, r2
136#else
137 teqp pc, #0x0c000003 @ turn off interrupts
138#endif
139
140 /*
141 * Note that some cache flushing and other stuff may
142 * be needed here - is there an Angel SWI call for this?
143 */
144
145 /*
146 * some architecture specific code can be inserted
Russell Kingf4619022006-01-12 17:17:57 +0000147 * by the linker here, but it should preserve r7, r8, and r9.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 */
149
150 .text
151 adr r0, LC0
152 ldmia r0, {r1, r2, r3, r4, r5, r6, ip, sp}
153 subs r0, r0, r1 @ calculate the delta offset
154
155 @ if delta is zero, we are
156 beq not_relocated @ running at the address we
157 @ were linked at.
158
159 /*
160 * We're running at a different address. We need to fix
161 * up various pointers:
162 * r5 - zImage base address
163 * r6 - GOT start
164 * ip - GOT end
165 */
166 add r5, r5, r0
167 add r6, r6, r0
168 add ip, ip, r0
169
170#ifndef CONFIG_ZBOOT_ROM
171 /*
172 * If we're running fully PIC === CONFIG_ZBOOT_ROM = n,
173 * we need to fix up pointers into the BSS region.
174 * r2 - BSS start
175 * r3 - BSS end
176 * sp - stack pointer
177 */
178 add r2, r2, r0
179 add r3, r3, r0
180 add sp, sp, r0
181
182 /*
183 * Relocate all entries in the GOT table.
184 */
1851: ldr r1, [r6, #0] @ relocate entries in the GOT
186 add r1, r1, r0 @ table. This fixes up the
187 str r1, [r6], #4 @ C references.
188 cmp r6, ip
189 blo 1b
190#else
191
192 /*
193 * Relocate entries in the GOT table. We only relocate
194 * the entries that are outside the (relocated) BSS region.
195 */
1961: ldr r1, [r6, #0] @ relocate entries in the GOT
197 cmp r1, r2 @ entry < bss_start ||
198 cmphs r3, r1 @ _end < entry
199 addlo r1, r1, r0 @ table. This fixes up the
200 str r1, [r6], #4 @ C references.
201 cmp r6, ip
202 blo 1b
203#endif
204
205not_relocated: mov r0, #0
2061: str r0, [r2], #4 @ clear bss
207 str r0, [r2], #4
208 str r0, [r2], #4
209 str r0, [r2], #4
210 cmp r2, r3
211 blo 1b
212
213 /*
214 * The C runtime environment should now be setup
215 * sufficiently. Turn the cache on, set up some
216 * pointers, and start decompressing.
217 */
218 bl cache_on
219
220 mov r1, sp @ malloc space above stack
221 add r2, sp, #0x10000 @ 64k max
222
223/*
224 * Check to see if we will overwrite ourselves.
225 * r4 = final kernel address
226 * r5 = start of this image
227 * r2 = end of malloc space (and therefore this image)
228 * We basically want:
229 * r4 >= r2 -> OK
230 * r4 + image length <= r5 -> OK
231 */
232 cmp r4, r2
233 bhs wont_overwrite
234 add r0, r4, #4096*1024 @ 4MB largest kernel size
235 cmp r0, r5
236 bls wont_overwrite
237
238 mov r5, r2 @ decompress after malloc space
239 mov r0, r5
240 mov r3, r7
241 bl decompress_kernel
242
243 add r0, r0, #127
244 bic r0, r0, #127 @ align the kernel length
245/*
246 * r0 = decompressed kernel length
247 * r1-r3 = unused
248 * r4 = kernel execution address
249 * r5 = decompressed kernel start
250 * r6 = processor ID
251 * r7 = architecture ID
Russell Kingf4619022006-01-12 17:17:57 +0000252 * r8 = atags pointer
253 * r9-r14 = corrupted
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 */
255 add r1, r5, r0 @ end of decompressed kernel
256 adr r2, reloc_start
257 ldr r3, LC1
258 add r3, r2, r3
Russell Kingf4619022006-01-12 17:17:57 +00002591: ldmia r2!, {r9 - r14} @ copy relocation code
260 stmia r1!, {r9 - r14}
261 ldmia r2!, {r9 - r14}
262 stmia r1!, {r9 - r14}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 cmp r2, r3
264 blo 1b
265
266 bl cache_clean_flush
267 add pc, r5, r0 @ call relocation code
268
269/*
270 * We're not in danger of overwriting ourselves. Do this the simple way.
271 *
272 * r4 = kernel execution address
273 * r7 = architecture ID
274 */
275wont_overwrite: mov r0, r4
276 mov r3, r7
277 bl decompress_kernel
278 b call_kernel
279
280 .type LC0, #object
281LC0: .word LC0 @ r1
282 .word __bss_start @ r2
283 .word _end @ r3
284 .word zreladdr @ r4
285 .word _start @ r5
286 .word _got_start @ r6
287 .word _got_end @ ip
288 .word user_stack+4096 @ sp
289LC1: .word reloc_end - reloc_start
290 .size LC0, . - LC0
291
292#ifdef CONFIG_ARCH_RPC
293 .globl params
294params: ldr r0, =params_phys
295 mov pc, lr
296 .ltorg
297 .align
298#endif
299
300/*
301 * Turn on the cache. We need to setup some page tables so that we
302 * can have both the I and D caches on.
303 *
304 * We place the page tables 16k down from the kernel execution address,
305 * and we hope that nothing else is using it. If we're using it, we
306 * will go pop!
307 *
308 * On entry,
309 * r4 = kernel execution address
310 * r6 = processor ID
311 * r7 = architecture number
Russell Kingf4619022006-01-12 17:17:57 +0000312 * r8 = atags pointer
313 * r9 = run-time address of "start" (???)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 * On exit,
Russell Kingf4619022006-01-12 17:17:57 +0000315 * r1, r2, r3, r9, r10, r12 corrupted
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 * This routine must preserve:
Russell Kingf4619022006-01-12 17:17:57 +0000317 * r4, r5, r6, r7, r8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 */
319 .align 5
320cache_on: mov r3, #8 @ cache_on function
321 b call_cache_fn
322
323__setup_mmu: sub r3, r4, #16384 @ Page directory size
324 bic r3, r3, #0xff @ Align the pointer
325 bic r3, r3, #0x3f00
326/*
327 * Initialise the page tables, turning on the cacheable and bufferable
328 * bits for the RAM area only.
329 */
330 mov r0, r3
Russell Kingf4619022006-01-12 17:17:57 +0000331 mov r9, r0, lsr #18
332 mov r9, r9, lsl #18 @ start of RAM
333 add r10, r9, #0x10000000 @ a reasonable RAM size
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 mov r1, #0x12
335 orr r1, r1, #3 << 10
336 add r2, r3, #16384
3371: cmp r1, r8 @ if virt > start of RAM
338 orrhs r1, r1, #0x0c @ set cacheable, bufferable
Russell Kingf4619022006-01-12 17:17:57 +0000339 cmp r1, r10 @ if virt > end of RAM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 bichs r1, r1, #0x0c @ clear cacheable, bufferable
341 str r1, [r0], #4 @ 1:1 mapping
342 add r1, r1, #1048576
343 teq r0, r2
344 bne 1b
345/*
346 * If ever we are running from Flash, then we surely want the cache
347 * to be enabled also for our execution instance... We map 2MB of it
348 * so there is no map overlap problem for up to 1 MB compressed kernel.
349 * If the execution is in RAM then we would only be duplicating the above.
350 */
351 mov r1, #0x1e
352 orr r1, r1, #3 << 10
353 mov r2, pc, lsr #20
354 orr r1, r1, r2, lsl #20
355 add r0, r3, r2, lsl #2
356 str r1, [r0], #4
357 add r1, r1, #1048576
358 str r1, [r0]
359 mov pc, lr
360
361__armv4_cache_on:
362 mov r12, lr
363 bl __setup_mmu
364 mov r0, #0
365 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
366 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
367 mrc p15, 0, r0, c1, c0, 0 @ read control reg
368 orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
369 orr r0, r0, #0x0030
370 bl __common_cache_on
371 mov r0, #0
372 mcr p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
373 mov pc, r12
374
375__arm6_cache_on:
376 mov r12, lr
377 bl __setup_mmu
378 mov r0, #0
379 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
380 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
381 mov r0, #0x30
382 bl __common_cache_on
383 mov r0, #0
384 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
385 mov pc, r12
386
387__common_cache_on:
388#ifndef DEBUG
389 orr r0, r0, #0x000d @ Write buffer, mmu
390#endif
391 mov r1, #-1
392 mcr p15, 0, r3, c2, c0, 0 @ load page table pointer
393 mcr p15, 0, r1, c3, c0, 0 @ load domain access control
394 mcr p15, 0, r0, c1, c0, 0 @ load control register
395 mov pc, lr
396
397/*
398 * All code following this line is relocatable. It is relocated by
399 * the above code to the end of the decompressed kernel image and
400 * executed there. During this time, we have no stacks.
401 *
402 * r0 = decompressed kernel length
403 * r1-r3 = unused
404 * r4 = kernel execution address
405 * r5 = decompressed kernel start
406 * r6 = processor ID
407 * r7 = architecture ID
Russell Kingf4619022006-01-12 17:17:57 +0000408 * r8 = atags pointer
409 * r9-r14 = corrupted
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 */
411 .align 5
Russell Kingf4619022006-01-12 17:17:57 +0000412reloc_start: add r9, r5, r0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 debug_reloc_start
414 mov r1, r4
4151:
416 .rept 4
Russell Kingf4619022006-01-12 17:17:57 +0000417 ldmia r5!, {r0, r2, r3, r10 - r14} @ relocate kernel
418 stmia r1!, {r0, r2, r3, r10 - r14}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 .endr
420
Russell Kingf4619022006-01-12 17:17:57 +0000421 cmp r5, r9
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 blo 1b
423 debug_reloc_end
424
425call_kernel: bl cache_clean_flush
426 bl cache_off
Russell Kingf4619022006-01-12 17:17:57 +0000427 mov r0, #0 @ must be zero
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 mov r1, r7 @ restore architecture number
Russell Kingf4619022006-01-12 17:17:57 +0000429 mov r2, r8 @ restore atags pointer
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 mov pc, r4 @ call kernel
431
432/*
433 * Here follow the relocatable cache support functions for the
434 * various processors. This is a generic hook for locating an
435 * entry and jumping to an instruction at the specified offset
436 * from the start of the block. Please note this is all position
437 * independent code.
438 *
439 * r1 = corrupted
440 * r2 = corrupted
441 * r3 = block offset
442 * r6 = corrupted
443 * r12 = corrupted
444 */
445
446call_cache_fn: adr r12, proc_types
447 mrc p15, 0, r6, c0, c0 @ get processor ID
4481: ldr r1, [r12, #0] @ get value
449 ldr r2, [r12, #4] @ get mask
450 eor r1, r1, r6 @ (real ^ match)
451 tst r1, r2 @ & mask
452 addeq pc, r12, r3 @ call cache function
453 add r12, r12, #4*5
454 b 1b
455
456/*
457 * Table for cache operations. This is basically:
458 * - CPU ID match
459 * - CPU ID mask
460 * - 'cache on' method instruction
461 * - 'cache off' method instruction
462 * - 'cache flush' method instruction
463 *
464 * We match an entry using: ((real_id ^ match) & mask) == 0
465 *
466 * Writethrough caches generally only need 'on' and 'off'
467 * methods. Writeback caches _must_ have the flush method
468 * defined.
469 */
470 .type proc_types,#object
471proc_types:
472 .word 0x41560600 @ ARM6/610
473 .word 0xffffffe0
474 b __arm6_cache_off @ works, but slow
475 b __arm6_cache_off
476 mov pc, lr
477@ b __arm6_cache_on @ untested
478@ b __arm6_cache_off
479@ b __armv3_cache_flush
480
481 .word 0x00000000 @ old ARM ID
482 .word 0x0000f000
483 mov pc, lr
484 mov pc, lr
485 mov pc, lr
486
487 .word 0x41007000 @ ARM7/710
488 .word 0xfff8fe00
489 b __arm7_cache_off
490 b __arm7_cache_off
491 mov pc, lr
492
493 .word 0x41807200 @ ARM720T (writethrough)
494 .word 0xffffff00
495 b __armv4_cache_on
496 b __armv4_cache_off
497 mov pc, lr
498
499 .word 0x00007000 @ ARM7 IDs
500 .word 0x0000f000
501 mov pc, lr
502 mov pc, lr
503 mov pc, lr
504
505 @ Everything from here on will be the new ID system.
506
507 .word 0x4401a100 @ sa110 / sa1100
508 .word 0xffffffe0
509 b __armv4_cache_on
510 b __armv4_cache_off
511 b __armv4_cache_flush
512
513 .word 0x6901b110 @ sa1110
514 .word 0xfffffff0
515 b __armv4_cache_on
516 b __armv4_cache_off
517 b __armv4_cache_flush
518
519 @ These match on the architecture ID
520
521 .word 0x00020000 @ ARMv4T
522 .word 0x000f0000
523 b __armv4_cache_on
524 b __armv4_cache_off
525 b __armv4_cache_flush
526
527 .word 0x00050000 @ ARMv5TE
528 .word 0x000f0000
529 b __armv4_cache_on
530 b __armv4_cache_off
531 b __armv4_cache_flush
532
533 .word 0x00060000 @ ARMv5TEJ
534 .word 0x000f0000
535 b __armv4_cache_on
536 b __armv4_cache_off
537 b __armv4_cache_flush
538
539 .word 0x00070000 @ ARMv6
540 .word 0x000f0000
541 b __armv4_cache_on
542 b __armv4_cache_off
543 b __armv6_cache_flush
544
545 .word 0 @ unrecognised type
546 .word 0
547 mov pc, lr
548 mov pc, lr
549 mov pc, lr
550
551 .size proc_types, . - proc_types
552
553/*
554 * Turn off the Cache and MMU. ARMv3 does not support
555 * reading the control register, but ARMv4 does.
556 *
557 * On entry, r6 = processor ID
558 * On exit, r0, r1, r2, r3, r12 corrupted
559 * This routine must preserve: r4, r6, r7
560 */
561 .align 5
562cache_off: mov r3, #12 @ cache_off function
563 b call_cache_fn
564
565__armv4_cache_off:
566 mrc p15, 0, r0, c1, c0
567 bic r0, r0, #0x000d
568 mcr p15, 0, r0, c1, c0 @ turn MMU and cache off
569 mov r0, #0
570 mcr p15, 0, r0, c7, c7 @ invalidate whole cache v4
571 mcr p15, 0, r0, c8, c7 @ invalidate whole TLB v4
572 mov pc, lr
573
574__arm6_cache_off:
575 mov r0, #0x00000030 @ ARM6 control reg.
576 b __armv3_cache_off
577
578__arm7_cache_off:
579 mov r0, #0x00000070 @ ARM7 control reg.
580 b __armv3_cache_off
581
582__armv3_cache_off:
583 mcr p15, 0, r0, c1, c0, 0 @ turn MMU and cache off
584 mov r0, #0
585 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
586 mcr p15, 0, r0, c5, c0, 0 @ invalidate whole TLB v3
587 mov pc, lr
588
589/*
590 * Clean and flush the cache to maintain consistency.
591 *
592 * On entry,
593 * r6 = processor ID
594 * On exit,
595 * r1, r2, r3, r11, r12 corrupted
596 * This routine must preserve:
597 * r0, r4, r5, r6, r7
598 */
599 .align 5
600cache_clean_flush:
601 mov r3, #16
602 b call_cache_fn
603
604__armv6_cache_flush:
605 mov r1, #0
606 mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D
607 mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
608 mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
609 mcr p15, 0, r1, c7, c10, 4 @ drain WB
610 mov pc, lr
611
612__armv4_cache_flush:
613 mov r2, #64*1024 @ default: 32K dcache size (*2)
614 mov r11, #32 @ default: 32 byte line size
615 mrc p15, 0, r3, c0, c0, 1 @ read cache type
616 teq r3, r6 @ cache ID register present?
617 beq no_cache_id
618 mov r1, r3, lsr #18
619 and r1, r1, #7
620 mov r2, #1024
621 mov r2, r2, lsl r1 @ base dcache size *2
622 tst r3, #1 << 14 @ test M bit
623 addne r2, r2, r2, lsr #1 @ +1/2 size if M == 1
624 mov r3, r3, lsr #12
625 and r3, r3, #3
626 mov r11, #8
627 mov r11, r11, lsl r3 @ cache line size in bytes
628no_cache_id:
629 bic r1, pc, #63 @ align to longest cache line
630 add r2, r1, r2
6311: ldr r3, [r1], r11 @ s/w flush D cache
632 teq r1, r2
633 bne 1b
634
635 mcr p15, 0, r1, c7, c5, 0 @ flush I cache
636 mcr p15, 0, r1, c7, c6, 0 @ flush D cache
637 mcr p15, 0, r1, c7, c10, 4 @ drain WB
638 mov pc, lr
639
640__armv3_cache_flush:
641 mov r1, #0
642 mcr p15, 0, r0, c7, c0, 0 @ invalidate whole cache v3
643 mov pc, lr
644
645/*
646 * Various debugging routines for printing hex characters and
647 * memory, which again must be relocatable.
648 */
649#ifdef DEBUG
650 .type phexbuf,#object
651phexbuf: .space 12
652 .size phexbuf, . - phexbuf
653
654phex: adr r3, phexbuf
655 mov r2, #0
656 strb r2, [r3, r1]
6571: subs r1, r1, #1
658 movmi r0, r3
659 bmi puts
660 and r2, r0, #15
661 mov r0, r0, lsr #4
662 cmp r2, #10
663 addge r2, r2, #7
664 add r2, r2, #'0'
665 strb r2, [r3, r1]
666 b 1b
667
668puts: loadsp r3
6691: ldrb r2, [r0], #1
670 teq r2, #0
671 moveq pc, lr
Russell King5cd0c342005-05-03 12:18:46 +01006722: writeb r2, r3
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 mov r1, #0x00020000
6743: subs r1, r1, #1
675 bne 3b
676 teq r2, #'\n'
677 moveq r2, #'\r'
678 beq 2b
679 teq r0, #0
680 bne 1b
681 mov pc, lr
682putc:
683 mov r2, r0
684 mov r0, #0
685 loadsp r3
686 b 2b
687
688memdump: mov r12, r0
689 mov r10, lr
690 mov r11, #0
6912: mov r0, r11, lsl #2
692 add r0, r0, r12
693 mov r1, #8
694 bl phex
695 mov r0, #':'
696 bl putc
6971: mov r0, #' '
698 bl putc
699 ldr r0, [r12, r11, lsl #2]
700 mov r1, #8
701 bl phex
702 and r0, r11, #7
703 teq r0, #3
704 moveq r0, #' '
705 bleq putc
706 and r0, r11, #7
707 add r11, r11, #1
708 teq r0, #7
709 bne 1b
710 mov r0, #'\n'
711 bl putc
712 cmp r11, #64
713 blt 2b
714 mov pc, r10
715#endif
716
717reloc_end:
718
719 .align
720 .section ".stack", "w"
721user_stack: .space 4096