Commit | Line | Data |
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c4df4bc1 MS |
1 | /* |
2 | * Exception handling for Microblaze | |
3 | * | |
4 | * Rewriten interrupt handling | |
5 | * | |
6 | * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> | |
7 | * Copyright (C) 2008-2009 PetaLogix | |
8 | * | |
9 | * uClinux customisation (C) 2005 John Williams | |
10 | * | |
11 | * MMU code derived from arch/ppc/kernel/head_4xx.S: | |
12 | * Copyright (C) 1995-1996 Gary Thomas <gdt@linuxppc.org> | |
13 | * Initial PowerPC version. | |
14 | * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> | |
15 | * Rewritten for PReP | |
16 | * Copyright (C) 1996 Paul Mackerras <paulus@cs.anu.edu.au> | |
17 | * Low-level exception handers, MMU support, and rewrite. | |
18 | * Copyright (C) 1997 Dan Malek <dmalek@jlc.net> | |
19 | * PowerPC 8xx modifications. | |
20 | * Copyright (C) 1998-1999 TiVo, Inc. | |
21 | * PowerPC 403GCX modifications. | |
22 | * Copyright (C) 1999 Grant Erickson <grant@lcse.umn.edu> | |
23 | * PowerPC 403GCX/405GP modifications. | |
24 | * Copyright 2000 MontaVista Software Inc. | |
25 | * PPC405 modifications | |
26 | * PowerPC 403GCX/405GP modifications. | |
27 | * Author: MontaVista Software, Inc. | |
28 | * frank_rowand@mvista.com or source@mvista.com | |
29 | * debbie_chu@mvista.com | |
30 | * | |
31 | * Original code | |
32 | * Copyright (C) 2004 Xilinx, Inc. | |
33 | * | |
34 | * This program is free software; you can redistribute it and/or modify it | |
35 | * under the terms of the GNU General Public License version 2 as published | |
36 | * by the Free Software Foundation. | |
37 | */ | |
38 | ||
39 | /* | |
40 | * Here are the handlers which don't require enabling translation | |
41 | * and calling other kernel code thus we can keep their design very simple | |
42 | * and do all processing in real mode. All what they need is a valid current | |
43 | * (that is an issue for the CONFIG_REGISTER_TASK_PTR case) | |
44 | * This handlers use r3,r4,r5,r6 and optionally r[current] to work therefore | |
45 | * these registers are saved/restored | |
46 | * The handlers which require translation are in entry.S --KAA | |
47 | * | |
48 | * Microblaze HW Exception Handler | |
49 | * - Non self-modifying exception handler for the following exception conditions | |
50 | * - Unalignment | |
51 | * - Instruction bus error | |
52 | * - Data bus error | |
53 | * - Illegal instruction opcode | |
54 | * - Divide-by-zero | |
55 | * | |
7db29dde MS |
56 | * - Privileged instruction exception (MMU) |
57 | * - Data storage exception (MMU) | |
58 | * - Instruction storage exception (MMU) | |
59 | * - Data TLB miss exception (MMU) | |
60 | * - Instruction TLB miss exception (MMU) | |
61 | * | |
c4df4bc1 MS |
62 | * Note we disable interrupts during exception handling, otherwise we will |
63 | * possibly get multiple re-entrancy if interrupt handles themselves cause | |
64 | * exceptions. JW | |
65 | */ | |
66 | ||
67 | #include <asm/exceptions.h> | |
68 | #include <asm/unistd.h> | |
69 | #include <asm/page.h> | |
70 | ||
71 | #include <asm/entry.h> | |
72 | #include <asm/current.h> | |
73 | #include <linux/linkage.h> | |
74 | ||
75 | #include <asm/mmu.h> | |
76 | #include <asm/pgtable.h> | |
3863dbce | 77 | #include <asm/signal.h> |
c4df4bc1 MS |
78 | #include <asm/asm-offsets.h> |
79 | ||
c06b3a06 MS |
80 | #undef DEBUG |
81 | ||
c4df4bc1 | 82 | /* Helpful Macros */ |
c4df4bc1 MS |
83 | #define NUM_TO_REG(num) r ## num |
84 | ||
7db29dde | 85 | #ifdef CONFIG_MMU |
7db29dde | 86 | #define RESTORE_STATE \ |
ac854ff1 MS |
87 | lwi r5, r1, 0; \ |
88 | mts rmsr, r5; \ | |
89 | nop; \ | |
7db29dde MS |
90 | lwi r3, r1, PT_R3; \ |
91 | lwi r4, r1, PT_R4; \ | |
92 | lwi r5, r1, PT_R5; \ | |
93 | lwi r6, r1, PT_R6; \ | |
94 | lwi r11, r1, PT_R11; \ | |
95 | lwi r31, r1, PT_R31; \ | |
6e83557c | 96 | lwi r1, r1, PT_R1; |
7db29dde MS |
97 | #endif /* CONFIG_MMU */ |
98 | ||
c4df4bc1 MS |
99 | #define LWREG_NOP \ |
100 | bri ex_handler_unhandled; \ | |
101 | nop; | |
102 | ||
103 | #define SWREG_NOP \ | |
104 | bri ex_handler_unhandled; \ | |
105 | nop; | |
106 | ||
107 | /* FIXME this is weird - for noMMU kernel is not possible to use brid | |
108 | * instruction which can shorten executed time | |
109 | */ | |
110 | ||
111 | /* r3 is the source */ | |
112 | #define R3_TO_LWREG_V(regnum) \ | |
113 | swi r3, r1, 4 * regnum; \ | |
114 | bri ex_handler_done; | |
115 | ||
116 | /* r3 is the source */ | |
117 | #define R3_TO_LWREG(regnum) \ | |
118 | or NUM_TO_REG (regnum), r0, r3; \ | |
119 | bri ex_handler_done; | |
120 | ||
121 | /* r3 is the target */ | |
122 | #define SWREG_TO_R3_V(regnum) \ | |
123 | lwi r3, r1, 4 * regnum; \ | |
124 | bri ex_sw_tail; | |
125 | ||
126 | /* r3 is the target */ | |
127 | #define SWREG_TO_R3(regnum) \ | |
128 | or r3, r0, NUM_TO_REG (regnum); \ | |
129 | bri ex_sw_tail; | |
130 | ||
7db29dde MS |
131 | #ifdef CONFIG_MMU |
132 | #define R3_TO_LWREG_VM_V(regnum) \ | |
133 | brid ex_lw_end_vm; \ | |
134 | swi r3, r7, 4 * regnum; | |
135 | ||
136 | #define R3_TO_LWREG_VM(regnum) \ | |
137 | brid ex_lw_end_vm; \ | |
138 | or NUM_TO_REG (regnum), r0, r3; | |
139 | ||
140 | #define SWREG_TO_R3_VM_V(regnum) \ | |
141 | brid ex_sw_tail_vm; \ | |
142 | lwi r3, r7, 4 * regnum; | |
143 | ||
144 | #define SWREG_TO_R3_VM(regnum) \ | |
145 | brid ex_sw_tail_vm; \ | |
146 | or r3, r0, NUM_TO_REG (regnum); | |
147 | ||
148 | /* Shift right instruction depending on available configuration */ | |
149 | #if CONFIG_XILINX_MICROBLAZE0_USE_BARREL > 0 | |
150 | #define BSRLI(rD, rA, imm) \ | |
151 | bsrli rD, rA, imm | |
7db29dde MS |
152 | #else |
153 | #define BSRLI(rD, rA, imm) BSRLI ## imm (rD, rA) | |
154 | /* Only the used shift constants defined here - add more if needed */ | |
155 | #define BSRLI2(rD, rA) \ | |
156 | srl rD, rA; /* << 1 */ \ | |
157 | srl rD, rD; /* << 2 */ | |
158 | #define BSRLI10(rD, rA) \ | |
159 | srl rD, rA; /* << 1 */ \ | |
160 | srl rD, rD; /* << 2 */ \ | |
161 | srl rD, rD; /* << 3 */ \ | |
162 | srl rD, rD; /* << 4 */ \ | |
163 | srl rD, rD; /* << 5 */ \ | |
164 | srl rD, rD; /* << 6 */ \ | |
165 | srl rD, rD; /* << 7 */ \ | |
166 | srl rD, rD; /* << 8 */ \ | |
167 | srl rD, rD; /* << 9 */ \ | |
168 | srl rD, rD /* << 10 */ | |
169 | #define BSRLI20(rD, rA) \ | |
170 | BSRLI10(rD, rA); \ | |
171 | BSRLI10(rD, rD) | |
172 | #endif | |
173 | #endif /* CONFIG_MMU */ | |
174 | ||
c4df4bc1 MS |
175 | .extern other_exception_handler /* Defined in exception.c */ |
176 | ||
177 | /* | |
178 | * hw_exception_handler - Handler for exceptions | |
179 | * | |
180 | * Exception handler notes: | |
181 | * - Handles all exceptions | |
182 | * - Does not handle unaligned exceptions during load into r17, r1, r0. | |
183 | * - Does not handle unaligned exceptions during store from r17 (cannot be | |
184 | * done) and r1 (slows down common case) | |
185 | * | |
186 | * Relevant register structures | |
187 | * | |
188 | * EAR - |----|----|----|----|----|----|----|----| | |
189 | * - < ## 32 bit faulting address ## > | |
190 | * | |
191 | * ESR - |----|----|----|----|----| - | - |-----|-----| | |
192 | * - W S REG EXC | |
193 | * | |
194 | * | |
195 | * STACK FRAME STRUCTURE (for NO_MMU) | |
196 | * --------------------------------- | |
197 | * | |
198 | * +-------------+ + 0 | |
199 | * | MSR | | |
200 | * +-------------+ + 4 | |
201 | * | r1 | | |
202 | * | . | | |
203 | * | . | | |
204 | * | . | | |
205 | * | . | | |
206 | * | r18 | | |
207 | * +-------------+ + 76 | |
208 | * | . | | |
209 | * | . | | |
210 | * | |
6e83557c MS |
211 | * MMU kernel uses the same 'pt_pool_space' pointed space |
212 | * which is used for storing register values - noMMu style was, that values were | |
c4df4bc1 MS |
213 | * stored in stack but in case of failure you lost information about register. |
214 | * Currently you can see register value in memory in specific place. | |
215 | * In compare to with previous solution the speed should be the same. | |
216 | * | |
217 | * MMU exception handler has different handling compare to no MMU kernel. | |
218 | * Exception handler use jump table for directing of what happen. For MMU kernel | |
219 | * is this approach better because MMU relate exception are handled by asm code | |
220 | * in this file. In compare to with MMU expect of unaligned exception | |
221 | * is everything handled by C code. | |
222 | */ | |
223 | ||
224 | /* | |
225 | * every of these handlers is entered having R3/4/5/6/11/current saved on stack | |
226 | * and clobbered so care should be taken to restore them if someone is going to | |
227 | * return from exception | |
228 | */ | |
229 | ||
230 | /* wrappers to restore state before coming to entry.S */ | |
7db29dde | 231 | #ifdef CONFIG_MMU |
6e83557c MS |
232 | .section .data |
233 | .align 4 | |
234 | pt_pool_space: | |
235 | .space PT_SIZE | |
236 | ||
c06b3a06 MS |
237 | #ifdef DEBUG |
238 | /* Create space for exception counting. */ | |
239 | .section .data | |
240 | .global exception_debug_table | |
241 | .align 4 | |
242 | exception_debug_table: | |
243 | /* Look at exception vector table. There is 32 exceptions * word size */ | |
244 | .space (32 * 4) | |
245 | #endif /* DEBUG */ | |
246 | ||
7db29dde MS |
247 | .section .rodata |
248 | .align 4 | |
249 | _MB_HW_ExceptionVectorTable: | |
250 | /* 0 - Undefined */ | |
251 | .long TOPHYS(ex_handler_unhandled) | |
252 | /* 1 - Unaligned data access exception */ | |
253 | .long TOPHYS(handle_unaligned_ex) | |
254 | /* 2 - Illegal op-code exception */ | |
255 | .long TOPHYS(full_exception_trapw) | |
256 | /* 3 - Instruction bus error exception */ | |
257 | .long TOPHYS(full_exception_trapw) | |
258 | /* 4 - Data bus error exception */ | |
259 | .long TOPHYS(full_exception_trapw) | |
260 | /* 5 - Divide by zero exception */ | |
261 | .long TOPHYS(full_exception_trapw) | |
262 | /* 6 - Floating point unit exception */ | |
263 | .long TOPHYS(full_exception_trapw) | |
264 | /* 7 - Privileged instruction exception */ | |
265 | .long TOPHYS(full_exception_trapw) | |
266 | /* 8 - 15 - Undefined */ | |
267 | .long TOPHYS(ex_handler_unhandled) | |
268 | .long TOPHYS(ex_handler_unhandled) | |
269 | .long TOPHYS(ex_handler_unhandled) | |
270 | .long TOPHYS(ex_handler_unhandled) | |
271 | .long TOPHYS(ex_handler_unhandled) | |
272 | .long TOPHYS(ex_handler_unhandled) | |
273 | .long TOPHYS(ex_handler_unhandled) | |
274 | .long TOPHYS(ex_handler_unhandled) | |
275 | /* 16 - Data storage exception */ | |
276 | .long TOPHYS(handle_data_storage_exception) | |
277 | /* 17 - Instruction storage exception */ | |
278 | .long TOPHYS(handle_instruction_storage_exception) | |
279 | /* 18 - Data TLB miss exception */ | |
280 | .long TOPHYS(handle_data_tlb_miss_exception) | |
281 | /* 19 - Instruction TLB miss exception */ | |
282 | .long TOPHYS(handle_instruction_tlb_miss_exception) | |
283 | /* 20 - 31 - Undefined */ | |
284 | .long TOPHYS(ex_handler_unhandled) | |
285 | .long TOPHYS(ex_handler_unhandled) | |
286 | .long TOPHYS(ex_handler_unhandled) | |
287 | .long TOPHYS(ex_handler_unhandled) | |
288 | .long TOPHYS(ex_handler_unhandled) | |
289 | .long TOPHYS(ex_handler_unhandled) | |
290 | .long TOPHYS(ex_handler_unhandled) | |
291 | .long TOPHYS(ex_handler_unhandled) | |
292 | .long TOPHYS(ex_handler_unhandled) | |
293 | .long TOPHYS(ex_handler_unhandled) | |
294 | .long TOPHYS(ex_handler_unhandled) | |
295 | .long TOPHYS(ex_handler_unhandled) | |
296 | #endif | |
297 | ||
c4df4bc1 MS |
298 | .global _hw_exception_handler |
299 | .section .text | |
300 | .align 4 | |
301 | .ent _hw_exception_handler | |
302 | _hw_exception_handler: | |
7db29dde | 303 | #ifndef CONFIG_MMU |
c4df4bc1 | 304 | addik r1, r1, -(EX_HANDLER_STACK_SIZ); /* Create stack frame */ |
7db29dde | 305 | #else |
6e83557c | 306 | swi r1, r0, TOPHYS(pt_pool_space + PT_R1); /* GET_SP */ |
7db29dde MS |
307 | /* Save date to kernel memory. Here is the problem |
308 | * when you came from user space */ | |
6e83557c | 309 | ori r1, r0, TOPHYS(pt_pool_space); |
7db29dde | 310 | #endif |
c4df4bc1 MS |
311 | swi r3, r1, PT_R3 |
312 | swi r4, r1, PT_R4 | |
313 | swi r5, r1, PT_R5 | |
314 | swi r6, r1, PT_R6 | |
315 | ||
7db29dde MS |
316 | #ifdef CONFIG_MMU |
317 | swi r11, r1, PT_R11 | |
318 | swi r31, r1, PT_R31 | |
319 | lwi r31, r0, TOPHYS(PER_CPU(CURRENT_SAVE)) /* get saved current */ | |
320 | #endif | |
321 | ||
ac854ff1 MS |
322 | mfs r5, rmsr; |
323 | nop | |
324 | swi r5, r1, 0; | |
b175bcfe | 325 | mfs r4, resr |
c4df4bc1 | 326 | nop |
b175bcfe | 327 | mfs r3, rear; |
7db29dde | 328 | nop |
c4df4bc1 | 329 | |
7db29dde | 330 | #ifndef CONFIG_MMU |
b175bcfe | 331 | andi r5, r4, 0x1000; /* Check ESR[DS] */ |
c4df4bc1 MS |
332 | beqi r5, not_in_delay_slot; /* Branch if ESR[DS] not set */ |
333 | mfs r17, rbtr; /* ESR[DS] set - return address in BTR */ | |
334 | nop | |
335 | not_in_delay_slot: | |
336 | swi r17, r1, PT_R17 | |
7db29dde | 337 | #endif |
c4df4bc1 | 338 | |
b175bcfe | 339 | andi r5, r4, 0x1F; /* Extract ESR[EXC] */ |
c4df4bc1 | 340 | |
7db29dde MS |
341 | #ifdef CONFIG_MMU |
342 | /* Calculate exception vector offset = r5 << 2 */ | |
343 | addk r6, r5, r5; /* << 1 */ | |
344 | addk r6, r6, r6; /* << 2 */ | |
345 | ||
708e7153 | 346 | #ifdef DEBUG |
7db29dde | 347 | /* counting which exception happen */ |
c06b3a06 | 348 | lwi r5, r0, TOPHYS(exception_debug_table) |
7db29dde | 349 | addi r5, r5, 1 |
c06b3a06 MS |
350 | swi r5, r0, TOPHYS(exception_debug_table) |
351 | lwi r5, r6, TOPHYS(exception_debug_table) | |
7db29dde | 352 | addi r5, r5, 1 |
c06b3a06 | 353 | swi r5, r6, TOPHYS(exception_debug_table) |
708e7153 | 354 | #endif |
7db29dde MS |
355 | /* end */ |
356 | /* Load the HW Exception vector */ | |
357 | lwi r6, r6, TOPHYS(_MB_HW_ExceptionVectorTable) | |
358 | bra r6 | |
359 | ||
360 | full_exception_trapw: | |
361 | RESTORE_STATE | |
362 | bri full_exception_trap | |
363 | #else | |
c4df4bc1 MS |
364 | /* Exceptions enabled here. This will allow nested exceptions */ |
365 | mfs r6, rmsr; | |
366 | nop | |
367 | swi r6, r1, 0; /* RMSR_OFFSET */ | |
368 | ori r6, r6, 0x100; /* Turn ON the EE bit */ | |
369 | andi r6, r6, ~2; /* Disable interrupts */ | |
370 | mts rmsr, r6; | |
371 | nop | |
372 | ||
373 | xori r6, r5, 1; /* 00001 = Unaligned Exception */ | |
374 | /* Jump to unalignment exception handler */ | |
375 | beqi r6, handle_unaligned_ex; | |
376 | ||
377 | handle_other_ex: /* Handle Other exceptions here */ | |
378 | /* Save other volatiles before we make procedure calls below */ | |
379 | swi r7, r1, PT_R7 | |
380 | swi r8, r1, PT_R8 | |
381 | swi r9, r1, PT_R9 | |
382 | swi r10, r1, PT_R10 | |
383 | swi r11, r1, PT_R11 | |
384 | swi r12, r1, PT_R12 | |
385 | swi r14, r1, PT_R14 | |
386 | swi r15, r1, PT_R15 | |
387 | swi r18, r1, PT_R18 | |
388 | ||
389 | or r5, r1, r0 | |
b175bcfe | 390 | andi r6, r4, 0x1F; /* Load ESR[EC] */ |
c4df4bc1 MS |
391 | lwi r7, r0, PER_CPU(KM) /* MS: saving current kernel mode to regs */ |
392 | swi r7, r1, PT_MODE | |
393 | mfs r7, rfsr | |
394 | nop | |
395 | addk r8, r17, r0; /* Load exception address */ | |
396 | bralid r15, full_exception; /* Branch to the handler */ | |
397 | nop; | |
131e4e97 | 398 | mts rfsr, r0; /* Clear sticky fsr */ |
71b23d54 | 399 | nop |
c4df4bc1 MS |
400 | |
401 | /* | |
402 | * Trigger execution of the signal handler by enabling | |
403 | * interrupts and calling an invalid syscall. | |
404 | */ | |
405 | mfs r5, rmsr; | |
406 | nop | |
407 | ori r5, r5, 2; | |
408 | mts rmsr, r5; /* enable interrupt */ | |
409 | nop | |
410 | addi r12, r0, __NR_syscalls; | |
411 | brki r14, 0x08; | |
412 | mfs r5, rmsr; /* disable interrupt */ | |
413 | nop | |
414 | andi r5, r5, ~2; | |
415 | mts rmsr, r5; | |
416 | nop | |
417 | ||
418 | lwi r7, r1, PT_R7 | |
419 | lwi r8, r1, PT_R8 | |
420 | lwi r9, r1, PT_R9 | |
421 | lwi r10, r1, PT_R10 | |
422 | lwi r11, r1, PT_R11 | |
423 | lwi r12, r1, PT_R12 | |
424 | lwi r14, r1, PT_R14 | |
425 | lwi r15, r1, PT_R15 | |
426 | lwi r18, r1, PT_R18 | |
427 | ||
428 | bri ex_handler_done; /* Complete exception handling */ | |
7db29dde | 429 | #endif |
c4df4bc1 MS |
430 | |
431 | /* 0x01 - Unaligned data access exception | |
432 | * This occurs when a word access is not aligned on a word boundary, | |
433 | * or when a 16-bit access is not aligned on a 16-bit boundary. | |
434 | * This handler perform the access, and returns, except for MMU when | |
435 | * the unaligned address is last on a 4k page or the physical address is | |
436 | * not found in the page table, in which case unaligned_data_trap is called. | |
437 | */ | |
438 | handle_unaligned_ex: | |
439 | /* Working registers already saved: R3, R4, R5, R6 | |
b175bcfe MS |
440 | * R4 = ESR |
441 | * R3 = EAR | |
c4df4bc1 | 442 | */ |
7db29dde | 443 | #ifdef CONFIG_MMU |
b175bcfe | 444 | andi r6, r4, 0x1000 /* Check ESR[DS] */ |
7db29dde MS |
445 | beqi r6, _no_delayslot /* Branch if ESR[DS] not set */ |
446 | mfs r17, rbtr; /* ESR[DS] set - return address in BTR */ | |
c4df4bc1 | 447 | nop |
7db29dde | 448 | _no_delayslot: |
3863dbce MS |
449 | /* jump to high level unaligned handler */ |
450 | RESTORE_STATE; | |
451 | bri unaligned_data_trap | |
7db29dde | 452 | #endif |
b175bcfe | 453 | andi r6, r4, 0x3E0; /* Mask and extract the register operand */ |
c4df4bc1 MS |
454 | srl r6, r6; /* r6 >> 5 */ |
455 | srl r6, r6; | |
456 | srl r6, r6; | |
457 | srl r6, r6; | |
458 | srl r6, r6; | |
459 | /* Store the register operand in a temporary location */ | |
460 | sbi r6, r0, TOPHYS(ex_reg_op); | |
461 | ||
b175bcfe | 462 | andi r6, r4, 0x400; /* Extract ESR[S] */ |
c4df4bc1 MS |
463 | bnei r6, ex_sw; |
464 | ex_lw: | |
b175bcfe | 465 | andi r6, r4, 0x800; /* Extract ESR[W] */ |
c4df4bc1 | 466 | beqi r6, ex_lhw; |
b175bcfe | 467 | lbui r5, r3, 0; /* Exception address in r3 */ |
c4df4bc1 MS |
468 | /* Load a word, byte-by-byte from destination address |
469 | and save it in tmp space */ | |
470 | sbi r5, r0, TOPHYS(ex_tmp_data_loc_0); | |
b175bcfe | 471 | lbui r5, r3, 1; |
c4df4bc1 | 472 | sbi r5, r0, TOPHYS(ex_tmp_data_loc_1); |
b175bcfe | 473 | lbui r5, r3, 2; |
c4df4bc1 | 474 | sbi r5, r0, TOPHYS(ex_tmp_data_loc_2); |
b175bcfe | 475 | lbui r5, r3, 3; |
c4df4bc1 | 476 | sbi r5, r0, TOPHYS(ex_tmp_data_loc_3); |
b175bcfe MS |
477 | /* Get the destination register value into r4 */ |
478 | lwi r4, r0, TOPHYS(ex_tmp_data_loc_0); | |
c4df4bc1 MS |
479 | bri ex_lw_tail; |
480 | ex_lhw: | |
b175bcfe | 481 | lbui r5, r3, 0; /* Exception address in r3 */ |
c4df4bc1 MS |
482 | /* Load a half-word, byte-by-byte from destination |
483 | address and save it in tmp space */ | |
484 | sbi r5, r0, TOPHYS(ex_tmp_data_loc_0); | |
b175bcfe | 485 | lbui r5, r3, 1; |
c4df4bc1 | 486 | sbi r5, r0, TOPHYS(ex_tmp_data_loc_1); |
b175bcfe MS |
487 | /* Get the destination register value into r4 */ |
488 | lhui r4, r0, TOPHYS(ex_tmp_data_loc_0); | |
c4df4bc1 MS |
489 | ex_lw_tail: |
490 | /* Get the destination register number into r5 */ | |
491 | lbui r5, r0, TOPHYS(ex_reg_op); | |
492 | /* Form load_word jump table offset (lw_table + (8 * regnum)) */ | |
cd341577 | 493 | addik r6, r0, TOPHYS(lw_table); |
c4df4bc1 MS |
494 | addk r5, r5, r5; |
495 | addk r5, r5, r5; | |
496 | addk r5, r5, r5; | |
497 | addk r5, r5, r6; | |
498 | bra r5; | |
499 | ex_lw_end: /* Exception handling of load word, ends */ | |
500 | ex_sw: | |
501 | /* Get the destination register number into r5 */ | |
502 | lbui r5, r0, TOPHYS(ex_reg_op); | |
503 | /* Form store_word jump table offset (sw_table + (8 * regnum)) */ | |
cd341577 | 504 | addik r6, r0, TOPHYS(sw_table); |
c4df4bc1 MS |
505 | add r5, r5, r5; |
506 | add r5, r5, r5; | |
507 | add r5, r5, r5; | |
508 | add r5, r5, r6; | |
509 | bra r5; | |
510 | ex_sw_tail: | |
511 | mfs r6, resr; | |
512 | nop | |
513 | andi r6, r6, 0x800; /* Extract ESR[W] */ | |
514 | beqi r6, ex_shw; | |
515 | /* Get the word - delay slot */ | |
b175bcfe | 516 | swi r4, r0, TOPHYS(ex_tmp_data_loc_0); |
c4df4bc1 | 517 | /* Store the word, byte-by-byte into destination address */ |
b175bcfe MS |
518 | lbui r4, r0, TOPHYS(ex_tmp_data_loc_0); |
519 | sbi r4, r3, 0; | |
520 | lbui r4, r0, TOPHYS(ex_tmp_data_loc_1); | |
521 | sbi r4, r3, 1; | |
522 | lbui r4, r0, TOPHYS(ex_tmp_data_loc_2); | |
523 | sbi r4, r3, 2; | |
524 | lbui r4, r0, TOPHYS(ex_tmp_data_loc_3); | |
525 | sbi r4, r3, 3; | |
c4df4bc1 MS |
526 | bri ex_handler_done; |
527 | ||
528 | ex_shw: | |
529 | /* Store the lower half-word, byte-by-byte into destination address */ | |
b175bcfe MS |
530 | swi r4, r0, TOPHYS(ex_tmp_data_loc_0); |
531 | lbui r4, r0, TOPHYS(ex_tmp_data_loc_2); | |
532 | sbi r4, r3, 0; | |
533 | lbui r4, r0, TOPHYS(ex_tmp_data_loc_3); | |
534 | sbi r4, r3, 1; | |
c4df4bc1 MS |
535 | ex_sw_end: /* Exception handling of store word, ends. */ |
536 | ||
537 | ex_handler_done: | |
7db29dde | 538 | #ifndef CONFIG_MMU |
c4df4bc1 MS |
539 | lwi r5, r1, 0 /* RMSR */ |
540 | mts rmsr, r5 | |
541 | nop | |
542 | lwi r3, r1, PT_R3 | |
543 | lwi r4, r1, PT_R4 | |
544 | lwi r5, r1, PT_R5 | |
545 | lwi r6, r1, PT_R6 | |
546 | lwi r17, r1, PT_R17 | |
547 | ||
548 | rted r17, 0 | |
549 | addik r1, r1, (EX_HANDLER_STACK_SIZ); /* Restore stack frame */ | |
7db29dde MS |
550 | #else |
551 | RESTORE_STATE; | |
552 | rted r17, 0 | |
553 | nop | |
554 | #endif | |
555 | ||
556 | #ifdef CONFIG_MMU | |
557 | /* Exception vector entry code. This code runs with address translation | |
558 | * turned off (i.e. using physical addresses). */ | |
559 | ||
560 | /* Exception vectors. */ | |
561 | ||
562 | /* 0x10 - Data Storage Exception | |
563 | * This happens for just a few reasons. U0 set (but we don't do that), | |
564 | * or zone protection fault (user violation, write to protected page). | |
565 | * If this is just an update of modified status, we do that quickly | |
566 | * and exit. Otherwise, we call heavyweight functions to do the work. | |
567 | */ | |
568 | handle_data_storage_exception: | |
569 | /* Working registers already saved: R3, R4, R5, R6 | |
570 | * R3 = ESR | |
571 | */ | |
572 | mfs r11, rpid | |
573 | nop | |
7db29dde MS |
574 | /* If we are faulting a kernel address, we have to use the |
575 | * kernel page tables. | |
576 | */ | |
bd1637d6 MS |
577 | ori r5, r0, CONFIG_KERNEL_START |
578 | cmpu r5, r3, r5 | |
579 | bgti r5, ex3 | |
7db29dde MS |
580 | /* First, check if it was a zone fault (which means a user |
581 | * tried to access a kernel or read-protected page - always | |
582 | * a SEGV). All other faults here must be stores, so no | |
583 | * need to check ESR_S as well. */ | |
7db29dde MS |
584 | andi r4, r4, 0x800 /* ESR_Z - zone protection */ |
585 | bnei r4, ex2 | |
586 | ||
587 | ori r4, r0, swapper_pg_dir | |
588 | mts rpid, r0 /* TLB will have 0 TID */ | |
589 | nop | |
590 | bri ex4 | |
591 | ||
592 | /* Get the PGD for the current thread. */ | |
593 | ex3: | |
594 | /* First, check if it was a zone fault (which means a user | |
595 | * tried to access a kernel or read-protected page - always | |
596 | * a SEGV). All other faults here must be stores, so no | |
597 | * need to check ESR_S as well. */ | |
7db29dde MS |
598 | andi r4, r4, 0x800 /* ESR_Z */ |
599 | bnei r4, ex2 | |
600 | /* get current task address */ | |
601 | addi r4 ,CURRENT_TASK, TOPHYS(0); | |
602 | lwi r4, r4, TASK_THREAD+PGDIR | |
603 | ex4: | |
604 | tophys(r4,r4) | |
9f78d3b5 MS |
605 | /* Create L1 (pgdir/pmd) address */ |
606 | BSRLI(r5,r3, PGDIR_SHIFT - 2) | |
607 | andi r5, r5, PAGE_SIZE - 4 | |
7db29dde MS |
608 | /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */ |
609 | or r4, r4, r5 | |
610 | lwi r4, r4, 0 /* Get L1 entry */ | |
9f78d3b5 | 611 | andi r5, r4, PAGE_MASK /* Extract L2 (pte) base address */ |
7db29dde MS |
612 | beqi r5, ex2 /* Bail if no table */ |
613 | ||
614 | tophys(r5,r5) | |
9f78d3b5 MS |
615 | BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */ |
616 | andi r6, r6, PAGE_SIZE - 4 | |
617 | andi r5, r5, PAGE_MASK + 0x3 | |
7db29dde MS |
618 | or r5, r5, r6 |
619 | lwi r4, r5, 0 /* Get Linux PTE */ | |
620 | ||
621 | andi r6, r4, _PAGE_RW /* Is it writeable? */ | |
622 | beqi r6, ex2 /* Bail if not */ | |
623 | ||
624 | /* Update 'changed' */ | |
625 | ori r4, r4, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE | |
626 | swi r4, r5, 0 /* Update Linux page table */ | |
627 | ||
628 | /* Most of the Linux PTE is ready to load into the TLB LO. | |
629 | * We set ZSEL, where only the LS-bit determines user access. | |
630 | * We set execute, because we don't have the granularity to | |
631 | * properly set this at the page level (Linux problem). | |
632 | * If shared is set, we cause a zero PID->TID load. | |
633 | * Many of these bits are software only. Bits we don't set | |
634 | * here we (properly should) assume have the appropriate value. | |
635 | */ | |
9f78d3b5 MS |
636 | /* Ignore memory coherent, just LSB on ZSEL is used + EX/WR */ |
637 | andi r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \ | |
638 | TLB_ZSEL(1) | TLB_ATTR_MASK | |
7db29dde MS |
639 | ori r4, r4, _PAGE_HWEXEC /* make it executable */ |
640 | ||
641 | /* find the TLB index that caused the fault. It has to be here*/ | |
642 | mts rtlbsx, r3 | |
643 | nop | |
644 | mfs r5, rtlbx /* DEBUG: TBD */ | |
645 | nop | |
646 | mts rtlblo, r4 /* Load TLB LO */ | |
647 | nop | |
648 | /* Will sync shadow TLBs */ | |
649 | ||
650 | /* Done...restore registers and get out of here. */ | |
651 | mts rpid, r11 | |
652 | nop | |
653 | bri 4 | |
654 | ||
655 | RESTORE_STATE; | |
656 | rted r17, 0 | |
657 | nop | |
658 | ex2: | |
659 | /* The bailout. Restore registers to pre-exception conditions | |
660 | * and call the heavyweights to help us out. */ | |
661 | mts rpid, r11 | |
662 | nop | |
663 | bri 4 | |
664 | RESTORE_STATE; | |
665 | bri page_fault_data_trap | |
666 | ||
667 | ||
668 | /* 0x11 - Instruction Storage Exception | |
669 | * This is caused by a fetch from non-execute or guarded pages. */ | |
670 | handle_instruction_storage_exception: | |
671 | /* Working registers already saved: R3, R4, R5, R6 | |
672 | * R3 = ESR | |
673 | */ | |
674 | ||
7db29dde MS |
675 | RESTORE_STATE; |
676 | bri page_fault_instr_trap | |
677 | ||
678 | /* 0x12 - Data TLB Miss Exception | |
679 | * As the name implies, translation is not in the MMU, so search the | |
680 | * page tables and fix it. The only purpose of this function is to | |
681 | * load TLB entries from the page table if they exist. | |
682 | */ | |
683 | handle_data_tlb_miss_exception: | |
684 | /* Working registers already saved: R3, R4, R5, R6 | |
7a6bbdc9 | 685 | * R3 = EAR, R4 = ESR |
7db29dde MS |
686 | */ |
687 | mfs r11, rpid | |
688 | nop | |
7db29dde MS |
689 | |
690 | /* If we are faulting a kernel address, we have to use the | |
691 | * kernel page tables. */ | |
7a6bbdc9 MS |
692 | ori r6, r0, CONFIG_KERNEL_START |
693 | cmpu r4, r3, r6 | |
7db29dde MS |
694 | bgti r4, ex5 |
695 | ori r4, r0, swapper_pg_dir | |
696 | mts rpid, r0 /* TLB will have 0 TID */ | |
697 | nop | |
698 | bri ex6 | |
c4df4bc1 | 699 | |
7db29dde MS |
700 | /* Get the PGD for the current thread. */ |
701 | ex5: | |
702 | /* get current task address */ | |
703 | addi r4 ,CURRENT_TASK, TOPHYS(0); | |
704 | lwi r4, r4, TASK_THREAD+PGDIR | |
705 | ex6: | |
706 | tophys(r4,r4) | |
9f78d3b5 MS |
707 | /* Create L1 (pgdir/pmd) address */ |
708 | BSRLI(r5,r3, PGDIR_SHIFT - 2) | |
709 | andi r5, r5, PAGE_SIZE - 4 | |
7db29dde MS |
710 | /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */ |
711 | or r4, r4, r5 | |
712 | lwi r4, r4, 0 /* Get L1 entry */ | |
9f78d3b5 | 713 | andi r5, r4, PAGE_MASK /* Extract L2 (pte) base address */ |
7db29dde MS |
714 | beqi r5, ex7 /* Bail if no table */ |
715 | ||
716 | tophys(r5,r5) | |
9f78d3b5 MS |
717 | BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */ |
718 | andi r6, r6, PAGE_SIZE - 4 | |
719 | andi r5, r5, PAGE_MASK + 0x3 | |
7db29dde MS |
720 | or r5, r5, r6 |
721 | lwi r4, r5, 0 /* Get Linux PTE */ | |
722 | ||
723 | andi r6, r4, _PAGE_PRESENT | |
724 | beqi r6, ex7 | |
725 | ||
726 | ori r4, r4, _PAGE_ACCESSED | |
727 | swi r4, r5, 0 | |
728 | ||
729 | /* Most of the Linux PTE is ready to load into the TLB LO. | |
730 | * We set ZSEL, where only the LS-bit determines user access. | |
731 | * We set execute, because we don't have the granularity to | |
732 | * properly set this at the page level (Linux problem). | |
733 | * If shared is set, we cause a zero PID->TID load. | |
734 | * Many of these bits are software only. Bits we don't set | |
735 | * here we (properly should) assume have the appropriate value. | |
736 | */ | |
3765d695 | 737 | brid finish_tlb_load |
9f78d3b5 MS |
738 | andi r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \ |
739 | TLB_ZSEL(1) | TLB_ATTR_MASK | |
7db29dde MS |
740 | ex7: |
741 | /* The bailout. Restore registers to pre-exception conditions | |
742 | * and call the heavyweights to help us out. | |
743 | */ | |
744 | mts rpid, r11 | |
745 | nop | |
746 | bri 4 | |
747 | RESTORE_STATE; | |
748 | bri page_fault_data_trap | |
749 | ||
750 | /* 0x13 - Instruction TLB Miss Exception | |
751 | * Nearly the same as above, except we get our information from | |
752 | * different registers and bailout to a different point. | |
753 | */ | |
754 | handle_instruction_tlb_miss_exception: | |
755 | /* Working registers already saved: R3, R4, R5, R6 | |
756 | * R3 = ESR | |
757 | */ | |
758 | mfs r11, rpid | |
759 | nop | |
7db29dde MS |
760 | |
761 | /* If we are faulting a kernel address, we have to use the | |
762 | * kernel page tables. | |
763 | */ | |
764 | ori r4, r0, CONFIG_KERNEL_START | |
765 | cmpu r4, r3, r4 | |
766 | bgti r4, ex8 | |
767 | ori r4, r0, swapper_pg_dir | |
768 | mts rpid, r0 /* TLB will have 0 TID */ | |
769 | nop | |
770 | bri ex9 | |
771 | ||
772 | /* Get the PGD for the current thread. */ | |
773 | ex8: | |
774 | /* get current task address */ | |
775 | addi r4 ,CURRENT_TASK, TOPHYS(0); | |
776 | lwi r4, r4, TASK_THREAD+PGDIR | |
777 | ex9: | |
778 | tophys(r4,r4) | |
9f78d3b5 MS |
779 | /* Create L1 (pgdir/pmd) address */ |
780 | BSRLI(r5,r3, PGDIR_SHIFT - 2) | |
781 | andi r5, r5, PAGE_SIZE - 4 | |
7db29dde MS |
782 | /* Assume pgdir aligned on 4K boundary, no need for "andi r4,r4,0xfffff003" */ |
783 | or r4, r4, r5 | |
784 | lwi r4, r4, 0 /* Get L1 entry */ | |
9f78d3b5 | 785 | andi r5, r4, PAGE_MASK /* Extract L2 (pte) base address */ |
7db29dde MS |
786 | beqi r5, ex10 /* Bail if no table */ |
787 | ||
788 | tophys(r5,r5) | |
9f78d3b5 MS |
789 | BSRLI(r6,r3,PTE_SHIFT) /* Compute PTE address */ |
790 | andi r6, r6, PAGE_SIZE - 4 | |
791 | andi r5, r5, PAGE_MASK + 0x3 | |
7db29dde MS |
792 | or r5, r5, r6 |
793 | lwi r4, r5, 0 /* Get Linux PTE */ | |
794 | ||
795 | andi r6, r4, _PAGE_PRESENT | |
3765d695 | 796 | beqi r6, ex10 |
7db29dde MS |
797 | |
798 | ori r4, r4, _PAGE_ACCESSED | |
799 | swi r4, r5, 0 | |
800 | ||
801 | /* Most of the Linux PTE is ready to load into the TLB LO. | |
802 | * We set ZSEL, where only the LS-bit determines user access. | |
803 | * We set execute, because we don't have the granularity to | |
804 | * properly set this at the page level (Linux problem). | |
805 | * If shared is set, we cause a zero PID->TID load. | |
806 | * Many of these bits are software only. Bits we don't set | |
807 | * here we (properly should) assume have the appropriate value. | |
808 | */ | |
3765d695 | 809 | brid finish_tlb_load |
9f78d3b5 MS |
810 | andi r4, r4, PAGE_MASK | TLB_EX | TLB_WR | \ |
811 | TLB_ZSEL(1) | TLB_ATTR_MASK | |
7db29dde MS |
812 | ex10: |
813 | /* The bailout. Restore registers to pre-exception conditions | |
814 | * and call the heavyweights to help us out. | |
815 | */ | |
816 | mts rpid, r11 | |
817 | nop | |
818 | bri 4 | |
819 | RESTORE_STATE; | |
820 | bri page_fault_instr_trap | |
821 | ||
822 | /* Both the instruction and data TLB miss get to this point to load the TLB. | |
823 | * r3 - EA of fault | |
824 | * r4 - TLB LO (info from Linux PTE) | |
825 | * r5, r6 - available to use | |
826 | * PID - loaded with proper value when we get here | |
827 | * Upon exit, we reload everything and RFI. | |
828 | * A common place to load the TLB. | |
829 | */ | |
e02db0aa MS |
830 | .section .data |
831 | .align 4 | |
832 | .global tlb_skip | |
833 | tlb_skip: | |
834 | .long MICROBLAZE_TLB_SKIP | |
7db29dde | 835 | tlb_index: |
1451d1d8 | 836 | /* MS: storing last used tlb index */ |
e02db0aa MS |
837 | .long MICROBLAZE_TLB_SIZE/2 |
838 | .previous | |
7db29dde MS |
839 | finish_tlb_load: |
840 | /* MS: load the last used TLB index. */ | |
841 | lwi r5, r0, TOPHYS(tlb_index) | |
842 | addik r5, r5, 1 /* MS: inc tlb_index -> use next one */ | |
843 | ||
844 | /* MS: FIXME this is potential fault, because this is mask not count */ | |
1451d1d8 | 845 | andi r5, r5, MICROBLAZE_TLB_SIZE - 1 |
7db29dde MS |
846 | ori r6, r0, 1 |
847 | cmp r31, r5, r6 | |
3765d695 | 848 | blti r31, ex12 |
e02db0aa | 849 | lwi r5, r0, TOPHYS(tlb_skip) |
3765d695 | 850 | ex12: |
7db29dde MS |
851 | /* MS: save back current TLB index */ |
852 | swi r5, r0, TOPHYS(tlb_index) | |
853 | ||
854 | ori r4, r4, _PAGE_HWEXEC /* make it executable */ | |
855 | mts rtlbx, r5 /* MS: save current TLB */ | |
856 | nop | |
857 | mts rtlblo, r4 /* MS: save to TLB LO */ | |
858 | nop | |
859 | ||
860 | /* Create EPN. This is the faulting address plus a static | |
861 | * set of bits. These are size, valid, E, U0, and ensure | |
862 | * bits 20 and 21 are zero. | |
863 | */ | |
9f78d3b5 | 864 | andi r3, r3, PAGE_MASK |
6e80cff5 MS |
865 | #ifdef CONFIG_MICROBLAZE_64K_PAGES |
866 | ori r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_64K) | |
867 | #elif CONFIG_MICROBLAZE_16K_PAGES | |
868 | ori r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_16K) | |
869 | #else | |
9f78d3b5 | 870 | ori r3, r3, TLB_VALID | TLB_PAGESZ(PAGESZ_4K) |
6e80cff5 | 871 | #endif |
7db29dde MS |
872 | mts rtlbhi, r3 /* Load TLB HI */ |
873 | nop | |
874 | ||
875 | /* Done...restore registers and get out of here. */ | |
7db29dde MS |
876 | mts rpid, r11 |
877 | nop | |
878 | bri 4 | |
879 | RESTORE_STATE; | |
880 | rted r17, 0 | |
881 | nop | |
882 | ||
883 | /* extern void giveup_fpu(struct task_struct *prev) | |
884 | * | |
885 | * The MicroBlaze processor may have an FPU, so this should not just | |
886 | * return: TBD. | |
887 | */ | |
888 | .globl giveup_fpu; | |
889 | .align 4; | |
890 | giveup_fpu: | |
891 | bralid r15,0 /* TBD */ | |
892 | nop | |
893 | ||
894 | /* At present, this routine just hangs. - extern void abort(void) */ | |
895 | .globl abort; | |
896 | .align 4; | |
897 | abort: | |
898 | br r0 | |
899 | ||
900 | .globl set_context; | |
901 | .align 4; | |
902 | set_context: | |
903 | mts rpid, r5 /* Shadow TLBs are automatically */ | |
904 | nop | |
905 | bri 4 /* flushed by changing PID */ | |
906 | rtsd r15,8 | |
907 | nop | |
908 | ||
909 | #endif | |
c4df4bc1 MS |
910 | .end _hw_exception_handler |
911 | ||
7db29dde MS |
912 | #ifdef CONFIG_MMU |
913 | /* Unaligned data access exception last on a 4k page for MMU. | |
914 | * When this is called, we are in virtual mode with exceptions enabled | |
915 | * and registers 1-13,15,17,18 saved. | |
916 | * | |
917 | * R3 = ESR | |
918 | * R4 = EAR | |
919 | * R7 = pointer to saved registers (struct pt_regs *regs) | |
920 | * | |
921 | * This handler perform the access, and returns via ret_from_exc. | |
922 | */ | |
923 | .global _unaligned_data_exception | |
924 | .ent _unaligned_data_exception | |
925 | _unaligned_data_exception: | |
926 | andi r8, r3, 0x3E0; /* Mask and extract the register operand */ | |
927 | BSRLI(r8,r8,2); /* r8 >> 2 = register operand * 8 */ | |
928 | andi r6, r3, 0x400; /* Extract ESR[S] */ | |
929 | bneid r6, ex_sw_vm; | |
930 | andi r6, r3, 0x800; /* Extract ESR[W] - delay slot */ | |
931 | ex_lw_vm: | |
932 | beqid r6, ex_lhw_vm; | |
3863dbce | 933 | load1: lbui r5, r4, 0; /* Exception address in r4 - delay slot */ |
7db29dde | 934 | /* Load a word, byte-by-byte from destination address and save it in tmp space*/ |
cd341577 | 935 | addik r6, r0, ex_tmp_data_loc_0; |
7db29dde | 936 | sbi r5, r6, 0; |
3863dbce | 937 | load2: lbui r5, r4, 1; |
7db29dde | 938 | sbi r5, r6, 1; |
3863dbce | 939 | load3: lbui r5, r4, 2; |
7db29dde | 940 | sbi r5, r6, 2; |
3863dbce | 941 | load4: lbui r5, r4, 3; |
7db29dde MS |
942 | sbi r5, r6, 3; |
943 | brid ex_lw_tail_vm; | |
944 | /* Get the destination register value into r3 - delay slot */ | |
945 | lwi r3, r6, 0; | |
946 | ex_lhw_vm: | |
947 | /* Load a half-word, byte-by-byte from destination address and | |
948 | * save it in tmp space */ | |
cd341577 | 949 | addik r6, r0, ex_tmp_data_loc_0; |
7db29dde | 950 | sbi r5, r6, 0; |
3863dbce | 951 | load5: lbui r5, r4, 1; |
7db29dde MS |
952 | sbi r5, r6, 1; |
953 | lhui r3, r6, 0; /* Get the destination register value into r3 */ | |
954 | ex_lw_tail_vm: | |
955 | /* Form load_word jump table offset (lw_table_vm + (8 * regnum)) */ | |
956 | addik r5, r8, lw_table_vm; | |
957 | bra r5; | |
958 | ex_lw_end_vm: /* Exception handling of load word, ends */ | |
959 | brai ret_from_exc; | |
960 | ex_sw_vm: | |
961 | /* Form store_word jump table offset (sw_table_vm + (8 * regnum)) */ | |
962 | addik r5, r8, sw_table_vm; | |
963 | bra r5; | |
964 | ex_sw_tail_vm: | |
cd341577 | 965 | addik r5, r0, ex_tmp_data_loc_0; |
7db29dde MS |
966 | beqid r6, ex_shw_vm; |
967 | swi r3, r5, 0; /* Get the word - delay slot */ | |
968 | /* Store the word, byte-by-byte into destination address */ | |
969 | lbui r3, r5, 0; | |
3863dbce | 970 | store1: sbi r3, r4, 0; |
7db29dde | 971 | lbui r3, r5, 1; |
3863dbce | 972 | store2: sbi r3, r4, 1; |
7db29dde | 973 | lbui r3, r5, 2; |
3863dbce | 974 | store3: sbi r3, r4, 2; |
7db29dde MS |
975 | lbui r3, r5, 3; |
976 | brid ret_from_exc; | |
3863dbce | 977 | store4: sbi r3, r4, 3; /* Delay slot */ |
7db29dde MS |
978 | ex_shw_vm: |
979 | /* Store the lower half-word, byte-by-byte into destination address */ | |
e3288f31 MS |
980 | #ifdef __MICROBLAZEEL__ |
981 | lbui r3, r5, 0; | |
982 | store5: sbi r3, r4, 0; | |
983 | lbui r3, r5, 1; | |
984 | brid ret_from_exc; | |
985 | store6: sbi r3, r4, 1; /* Delay slot */ | |
986 | #else | |
7db29dde | 987 | lbui r3, r5, 2; |
3863dbce | 988 | store5: sbi r3, r4, 0; |
7db29dde MS |
989 | lbui r3, r5, 3; |
990 | brid ret_from_exc; | |
3863dbce | 991 | store6: sbi r3, r4, 1; /* Delay slot */ |
e3288f31 MS |
992 | #endif |
993 | ||
7db29dde | 994 | ex_sw_end_vm: /* Exception handling of store word, ends. */ |
3863dbce MS |
995 | |
996 | /* We have to prevent cases that get/put_user macros get unaligned pointer | |
997 | * to bad page area. We have to find out which origin instruction caused it | |
998 | * and called fixup for that origin instruction not instruction in unaligned | |
999 | * handler */ | |
1000 | ex_unaligned_fixup: | |
1001 | ori r5, r7, 0 /* setup pointer to pt_regs */ | |
1002 | lwi r6, r7, PT_PC; /* faulting address is one instruction above */ | |
1003 | addik r6, r6, -4 /* for finding proper fixup */ | |
1004 | swi r6, r7, PT_PC; /* a save back it to PT_PC */ | |
1005 | addik r7, r0, SIGSEGV | |
1006 | /* call bad_page_fault for finding aligned fixup, fixup address is saved | |
1007 | * in PT_PC which is used as return address from exception */ | |
cd341577 | 1008 | addik r15, r0, ret_from_exc-8 /* setup return address */ |
3863dbce MS |
1009 | brid bad_page_fault |
1010 | nop | |
1011 | ||
1012 | /* We prevent all load/store because it could failed any attempt to access */ | |
1013 | .section __ex_table,"a"; | |
1014 | .word load1,ex_unaligned_fixup; | |
1015 | .word load2,ex_unaligned_fixup; | |
1016 | .word load3,ex_unaligned_fixup; | |
1017 | .word load4,ex_unaligned_fixup; | |
1018 | .word load5,ex_unaligned_fixup; | |
1019 | .word store1,ex_unaligned_fixup; | |
1020 | .word store2,ex_unaligned_fixup; | |
1021 | .word store3,ex_unaligned_fixup; | |
1022 | .word store4,ex_unaligned_fixup; | |
1023 | .word store5,ex_unaligned_fixup; | |
1024 | .word store6,ex_unaligned_fixup; | |
1025 | .previous; | |
7db29dde MS |
1026 | .end _unaligned_data_exception |
1027 | #endif /* CONFIG_MMU */ | |
1028 | ||
ce3266c0 | 1029 | .global ex_handler_unhandled |
c4df4bc1 MS |
1030 | ex_handler_unhandled: |
1031 | /* FIXME add handle function for unhandled exception - dump register */ | |
1032 | bri 0 | |
1033 | ||
7db29dde MS |
1034 | /* |
1035 | * hw_exception_handler Jump Table | |
1036 | * - Contains code snippets for each register that caused the unalign exception | |
1037 | * - Hence exception handler is NOT self-modifying | |
1038 | * - Separate table for load exceptions and store exceptions. | |
1039 | * - Each table is of size: (8 * 32) = 256 bytes | |
1040 | */ | |
1041 | ||
c4df4bc1 MS |
1042 | .section .text |
1043 | .align 4 | |
1044 | lw_table: | |
1045 | lw_r0: R3_TO_LWREG (0); | |
1046 | lw_r1: LWREG_NOP; | |
1047 | lw_r2: R3_TO_LWREG (2); | |
1048 | lw_r3: R3_TO_LWREG_V (3); | |
1049 | lw_r4: R3_TO_LWREG_V (4); | |
1050 | lw_r5: R3_TO_LWREG_V (5); | |
1051 | lw_r6: R3_TO_LWREG_V (6); | |
1052 | lw_r7: R3_TO_LWREG (7); | |
1053 | lw_r8: R3_TO_LWREG (8); | |
1054 | lw_r9: R3_TO_LWREG (9); | |
1055 | lw_r10: R3_TO_LWREG (10); | |
1056 | lw_r11: R3_TO_LWREG (11); | |
1057 | lw_r12: R3_TO_LWREG (12); | |
1058 | lw_r13: R3_TO_LWREG (13); | |
1059 | lw_r14: R3_TO_LWREG (14); | |
1060 | lw_r15: R3_TO_LWREG (15); | |
1061 | lw_r16: R3_TO_LWREG (16); | |
1062 | lw_r17: LWREG_NOP; | |
1063 | lw_r18: R3_TO_LWREG (18); | |
1064 | lw_r19: R3_TO_LWREG (19); | |
1065 | lw_r20: R3_TO_LWREG (20); | |
1066 | lw_r21: R3_TO_LWREG (21); | |
1067 | lw_r22: R3_TO_LWREG (22); | |
1068 | lw_r23: R3_TO_LWREG (23); | |
1069 | lw_r24: R3_TO_LWREG (24); | |
1070 | lw_r25: R3_TO_LWREG (25); | |
1071 | lw_r26: R3_TO_LWREG (26); | |
1072 | lw_r27: R3_TO_LWREG (27); | |
1073 | lw_r28: R3_TO_LWREG (28); | |
1074 | lw_r29: R3_TO_LWREG (29); | |
1075 | lw_r30: R3_TO_LWREG (30); | |
7db29dde MS |
1076 | #ifdef CONFIG_MMU |
1077 | lw_r31: R3_TO_LWREG_V (31); | |
1078 | #else | |
c4df4bc1 | 1079 | lw_r31: R3_TO_LWREG (31); |
7db29dde | 1080 | #endif |
c4df4bc1 MS |
1081 | |
1082 | sw_table: | |
1083 | sw_r0: SWREG_TO_R3 (0); | |
1084 | sw_r1: SWREG_NOP; | |
1085 | sw_r2: SWREG_TO_R3 (2); | |
1086 | sw_r3: SWREG_TO_R3_V (3); | |
1087 | sw_r4: SWREG_TO_R3_V (4); | |
1088 | sw_r5: SWREG_TO_R3_V (5); | |
1089 | sw_r6: SWREG_TO_R3_V (6); | |
1090 | sw_r7: SWREG_TO_R3 (7); | |
1091 | sw_r8: SWREG_TO_R3 (8); | |
1092 | sw_r9: SWREG_TO_R3 (9); | |
1093 | sw_r10: SWREG_TO_R3 (10); | |
1094 | sw_r11: SWREG_TO_R3 (11); | |
1095 | sw_r12: SWREG_TO_R3 (12); | |
1096 | sw_r13: SWREG_TO_R3 (13); | |
1097 | sw_r14: SWREG_TO_R3 (14); | |
1098 | sw_r15: SWREG_TO_R3 (15); | |
1099 | sw_r16: SWREG_TO_R3 (16); | |
1100 | sw_r17: SWREG_NOP; | |
1101 | sw_r18: SWREG_TO_R3 (18); | |
1102 | sw_r19: SWREG_TO_R3 (19); | |
1103 | sw_r20: SWREG_TO_R3 (20); | |
1104 | sw_r21: SWREG_TO_R3 (21); | |
1105 | sw_r22: SWREG_TO_R3 (22); | |
1106 | sw_r23: SWREG_TO_R3 (23); | |
1107 | sw_r24: SWREG_TO_R3 (24); | |
1108 | sw_r25: SWREG_TO_R3 (25); | |
1109 | sw_r26: SWREG_TO_R3 (26); | |
1110 | sw_r27: SWREG_TO_R3 (27); | |
1111 | sw_r28: SWREG_TO_R3 (28); | |
1112 | sw_r29: SWREG_TO_R3 (29); | |
1113 | sw_r30: SWREG_TO_R3 (30); | |
7db29dde MS |
1114 | #ifdef CONFIG_MMU |
1115 | sw_r31: SWREG_TO_R3_V (31); | |
1116 | #else | |
c4df4bc1 | 1117 | sw_r31: SWREG_TO_R3 (31); |
7db29dde MS |
1118 | #endif |
1119 | ||
1120 | #ifdef CONFIG_MMU | |
1121 | lw_table_vm: | |
1122 | lw_r0_vm: R3_TO_LWREG_VM (0); | |
1123 | lw_r1_vm: R3_TO_LWREG_VM_V (1); | |
1124 | lw_r2_vm: R3_TO_LWREG_VM_V (2); | |
1125 | lw_r3_vm: R3_TO_LWREG_VM_V (3); | |
1126 | lw_r4_vm: R3_TO_LWREG_VM_V (4); | |
1127 | lw_r5_vm: R3_TO_LWREG_VM_V (5); | |
1128 | lw_r6_vm: R3_TO_LWREG_VM_V (6); | |
1129 | lw_r7_vm: R3_TO_LWREG_VM_V (7); | |
1130 | lw_r8_vm: R3_TO_LWREG_VM_V (8); | |
1131 | lw_r9_vm: R3_TO_LWREG_VM_V (9); | |
1132 | lw_r10_vm: R3_TO_LWREG_VM_V (10); | |
1133 | lw_r11_vm: R3_TO_LWREG_VM_V (11); | |
1134 | lw_r12_vm: R3_TO_LWREG_VM_V (12); | |
1135 | lw_r13_vm: R3_TO_LWREG_VM_V (13); | |
c1138940 | 1136 | lw_r14_vm: R3_TO_LWREG_VM_V (14); |
7db29dde | 1137 | lw_r15_vm: R3_TO_LWREG_VM_V (15); |
c1138940 | 1138 | lw_r16_vm: R3_TO_LWREG_VM_V (16); |
7db29dde MS |
1139 | lw_r17_vm: R3_TO_LWREG_VM_V (17); |
1140 | lw_r18_vm: R3_TO_LWREG_VM_V (18); | |
c1138940 MS |
1141 | lw_r19_vm: R3_TO_LWREG_VM_V (19); |
1142 | lw_r20_vm: R3_TO_LWREG_VM_V (20); | |
1143 | lw_r21_vm: R3_TO_LWREG_VM_V (21); | |
1144 | lw_r22_vm: R3_TO_LWREG_VM_V (22); | |
1145 | lw_r23_vm: R3_TO_LWREG_VM_V (23); | |
1146 | lw_r24_vm: R3_TO_LWREG_VM_V (24); | |
1147 | lw_r25_vm: R3_TO_LWREG_VM_V (25); | |
1148 | lw_r26_vm: R3_TO_LWREG_VM_V (26); | |
1149 | lw_r27_vm: R3_TO_LWREG_VM_V (27); | |
1150 | lw_r28_vm: R3_TO_LWREG_VM_V (28); | |
1151 | lw_r29_vm: R3_TO_LWREG_VM_V (29); | |
1152 | lw_r30_vm: R3_TO_LWREG_VM_V (30); | |
7db29dde MS |
1153 | lw_r31_vm: R3_TO_LWREG_VM_V (31); |
1154 | ||
1155 | sw_table_vm: | |
1156 | sw_r0_vm: SWREG_TO_R3_VM (0); | |
1157 | sw_r1_vm: SWREG_TO_R3_VM_V (1); | |
1158 | sw_r2_vm: SWREG_TO_R3_VM_V (2); | |
1159 | sw_r3_vm: SWREG_TO_R3_VM_V (3); | |
1160 | sw_r4_vm: SWREG_TO_R3_VM_V (4); | |
1161 | sw_r5_vm: SWREG_TO_R3_VM_V (5); | |
1162 | sw_r6_vm: SWREG_TO_R3_VM_V (6); | |
1163 | sw_r7_vm: SWREG_TO_R3_VM_V (7); | |
1164 | sw_r8_vm: SWREG_TO_R3_VM_V (8); | |
1165 | sw_r9_vm: SWREG_TO_R3_VM_V (9); | |
1166 | sw_r10_vm: SWREG_TO_R3_VM_V (10); | |
1167 | sw_r11_vm: SWREG_TO_R3_VM_V (11); | |
1168 | sw_r12_vm: SWREG_TO_R3_VM_V (12); | |
1169 | sw_r13_vm: SWREG_TO_R3_VM_V (13); | |
c1138940 | 1170 | sw_r14_vm: SWREG_TO_R3_VM_V (14); |
7db29dde | 1171 | sw_r15_vm: SWREG_TO_R3_VM_V (15); |
c1138940 | 1172 | sw_r16_vm: SWREG_TO_R3_VM_V (16); |
7db29dde MS |
1173 | sw_r17_vm: SWREG_TO_R3_VM_V (17); |
1174 | sw_r18_vm: SWREG_TO_R3_VM_V (18); | |
c1138940 MS |
1175 | sw_r19_vm: SWREG_TO_R3_VM_V (19); |
1176 | sw_r20_vm: SWREG_TO_R3_VM_V (20); | |
1177 | sw_r21_vm: SWREG_TO_R3_VM_V (21); | |
1178 | sw_r22_vm: SWREG_TO_R3_VM_V (22); | |
1179 | sw_r23_vm: SWREG_TO_R3_VM_V (23); | |
1180 | sw_r24_vm: SWREG_TO_R3_VM_V (24); | |
1181 | sw_r25_vm: SWREG_TO_R3_VM_V (25); | |
1182 | sw_r26_vm: SWREG_TO_R3_VM_V (26); | |
1183 | sw_r27_vm: SWREG_TO_R3_VM_V (27); | |
1184 | sw_r28_vm: SWREG_TO_R3_VM_V (28); | |
1185 | sw_r29_vm: SWREG_TO_R3_VM_V (29); | |
1186 | sw_r30_vm: SWREG_TO_R3_VM_V (30); | |
7db29dde MS |
1187 | sw_r31_vm: SWREG_TO_R3_VM_V (31); |
1188 | #endif /* CONFIG_MMU */ | |
c4df4bc1 MS |
1189 | |
1190 | /* Temporary data structures used in the handler */ | |
1191 | .section .data | |
1192 | .align 4 | |
1193 | ex_tmp_data_loc_0: | |
1194 | .byte 0 | |
1195 | ex_tmp_data_loc_1: | |
1196 | .byte 0 | |
1197 | ex_tmp_data_loc_2: | |
1198 | .byte 0 | |
1199 | ex_tmp_data_loc_3: | |
1200 | .byte 0 | |
1201 | ex_reg_op: | |
1202 | .byte 0 |