Commit | Line | Data |
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1394f032 BW |
1 | /* |
2 | * File: arch/blackfin/kernel/traps.c | |
3 | * Based on: | |
4 | * Author: Hamish Macdonald | |
5 | * | |
6 | * Created: | |
7 | * Description: uses S/W interrupt 15 for the system calls | |
8 | * | |
9 | * Modified: | |
10 | * Copyright 2004-2006 Analog Devices Inc. | |
11 | * | |
12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with this program; if not, see the file COPYING, or write | |
26 | * to the Free Software Foundation, Inc., | |
27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
28 | */ | |
29 | ||
1f83b8f1 MF |
30 | #include <linux/uaccess.h> |
31 | #include <linux/interrupt.h> | |
32 | #include <linux/module.h> | |
33 | #include <linux/kallsyms.h> | |
d31c5ab1 | 34 | #include <linux/fs.h> |
8feae131 | 35 | #include <linux/rbtree.h> |
1394f032 BW |
36 | #include <asm/traps.h> |
37 | #include <asm/cacheflush.h> | |
f4585a08 | 38 | #include <asm/cplb.h> |
1394f032 | 39 | #include <asm/blackfin.h> |
1394f032 | 40 | #include <asm/irq_handler.h> |
d8f66c8c | 41 | #include <linux/irq.h> |
669b792c | 42 | #include <asm/trace.h> |
226eb1ef | 43 | #include <asm/fixed_code.h> |
1394f032 BW |
44 | |
45 | #ifdef CONFIG_KGDB | |
1394f032 | 46 | # include <linux/kgdb.h> |
226eb1ef RG |
47 | |
48 | # define CHK_DEBUGGER_TRAP() \ | |
49 | do { \ | |
a5ac0129 | 50 | kgdb_handle_exception(trapnr, sig, info.si_code, fp); \ |
226eb1ef RG |
51 | } while (0) |
52 | # define CHK_DEBUGGER_TRAP_MAYBE() \ | |
53 | do { \ | |
54 | if (kgdb_connected) \ | |
55 | CHK_DEBUGGER_TRAP(); \ | |
56 | } while (0) | |
57 | #else | |
58 | # define CHK_DEBUGGER_TRAP() do { } while (0) | |
59 | # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0) | |
1394f032 BW |
60 | #endif |
61 | ||
9f06c38f | 62 | |
4ee1c453 | 63 | #ifdef CONFIG_DEBUG_VERBOSE |
9f06c38f RG |
64 | #define verbose_printk(fmt, arg...) \ |
65 | printk(fmt, ##arg) | |
66 | #else | |
67 | #define verbose_printk(fmt, arg...) \ | |
68 | ({ if (0) printk(fmt, ##arg); 0; }) | |
69 | #endif | |
70 | ||
1394f032 BW |
71 | /* Initiate the event table handler */ |
72 | void __init trap_init(void) | |
73 | { | |
74 | CSYNC(); | |
75 | bfin_write_EVT3(trap); | |
76 | CSYNC(); | |
77 | } | |
78 | ||
226eb1ef | 79 | static void decode_address(char *buf, unsigned long address) |
1394f032 | 80 | { |
9f06c38f | 81 | #ifdef CONFIG_DEBUG_VERBOSE |
1394f032 BW |
82 | struct vm_list_struct *vml; |
83 | struct task_struct *p; | |
84 | struct mm_struct *mm; | |
885be03b | 85 | unsigned long flags, offset; |
904656cd | 86 | unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic(); |
8feae131 | 87 | struct rb_node *n; |
1394f032 BW |
88 | |
89 | #ifdef CONFIG_KALLSYMS | |
8a0e6656 | 90 | unsigned long symsize; |
1394f032 BW |
91 | const char *symname; |
92 | char *modname; | |
93 | char *delim = ":"; | |
94 | char namebuf[128]; | |
95 | ||
96 | /* look up the address and see if we are in kernel space */ | |
97 | symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf); | |
98 | ||
99 | if (symname) { | |
100 | /* yeah! kernel space! */ | |
101 | if (!modname) | |
102 | modname = delim = ""; | |
226eb1ef | 103 | sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }", |
1f83b8f1 | 104 | (void *)address, delim, modname, delim, symname, |
1394f032 | 105 | (unsigned long)offset); |
885be03b | 106 | return; |
1394f032 BW |
107 | |
108 | } | |
109 | #endif | |
110 | ||
226eb1ef RG |
111 | /* Problem in fixed code section? */ |
112 | if (address >= FIXED_CODE_START && address < FIXED_CODE_END) { | |
113 | sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address); | |
114 | return; | |
115 | } | |
116 | ||
117 | /* Problem somewhere before the kernel start address */ | |
118 | if (address < CONFIG_BOOT_LOAD) { | |
119 | sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address); | |
120 | return; | |
121 | } | |
122 | ||
1394f032 BW |
123 | /* looks like we're off in user-land, so let's walk all the |
124 | * mappings of all our processes and see if we can't be a whee | |
125 | * bit more specific | |
126 | */ | |
885be03b | 127 | write_lock_irqsave(&tasklist_lock, flags); |
1394f032 | 128 | for_each_process(p) { |
904656cd | 129 | mm = (in_atomic ? p->mm : get_task_mm(p)); |
1394f032 BW |
130 | if (!mm) |
131 | continue; | |
132 | ||
8feae131 DH |
133 | for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) { |
134 | struct vm_area_struct *vma; | |
135 | ||
136 | vma = rb_entry(n, struct vm_area_struct, vm_rb); | |
1394f032 BW |
137 | |
138 | if (address >= vma->vm_start && address < vma->vm_end) { | |
cf28b486 | 139 | char _tmpbuf[256]; |
1394f032 BW |
140 | char *name = p->comm; |
141 | struct file *file = vma->vm_file; | |
cf28b486 | 142 | |
6a0bfff4 TP |
143 | if (file) { |
144 | char *d_name = d_path(&file->f_path, _tmpbuf, | |
cf28b486 | 145 | sizeof(_tmpbuf)); |
6a0bfff4 TP |
146 | if (!IS_ERR(d_name)) |
147 | name = d_name; | |
148 | } | |
1394f032 | 149 | |
8a0e6656 MF |
150 | /* FLAT does not have its text aligned to the start of |
151 | * the map while FDPIC ELF does ... | |
152 | */ | |
7f1c9068 RG |
153 | |
154 | /* before we can check flat/fdpic, we need to | |
155 | * make sure current is valid | |
156 | */ | |
157 | if ((unsigned long)current >= FIXED_CODE_START && | |
158 | !((unsigned long)current & 0x3)) { | |
159 | if (current->mm && | |
160 | (address > current->mm->start_code) && | |
161 | (address < current->mm->end_code)) | |
162 | offset = address - current->mm->start_code; | |
163 | else | |
164 | offset = (address - vma->vm_start) + | |
165 | (vma->vm_pgoff << PAGE_SHIFT); | |
166 | ||
167 | sprintf(buf, "<0x%p> [ %s + 0x%lx ]", | |
168 | (void *)address, name, offset); | |
169 | } else | |
170 | sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]", | |
171 | (void *)address, name, | |
172 | vma->vm_start, vma->vm_end); | |
173 | ||
904656cd | 174 | if (!in_atomic) |
885be03b | 175 | mmput(mm); |
7f1c9068 | 176 | |
f09630bf RG |
177 | if (!strlen(buf)) |
178 | sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name); | |
179 | ||
885be03b | 180 | goto done; |
1394f032 | 181 | } |
1394f032 | 182 | } |
904656cd | 183 | if (!in_atomic) |
885be03b | 184 | mmput(mm); |
1394f032 | 185 | } |
1394f032 BW |
186 | |
187 | /* we were unable to find this address anywhere */ | |
f09630bf | 188 | sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address); |
885be03b RG |
189 | |
190 | done: | |
191 | write_unlock_irqrestore(&tasklist_lock, flags); | |
9f06c38f RG |
192 | #else |
193 | sprintf(buf, " "); | |
194 | #endif | |
1394f032 BW |
195 | } |
196 | ||
2ebcade5 RG |
197 | asmlinkage void double_fault_c(struct pt_regs *fp) |
198 | { | |
226eb1ef RG |
199 | console_verbose(); |
200 | oops_in_progress = 1; | |
9f06c38f | 201 | #ifdef CONFIG_DEBUG_VERBOSE |
2ebcade5 | 202 | printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n"); |
0c7a6b21 RG |
203 | #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT |
204 | if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) { | |
8f65873e | 205 | unsigned int cpu = smp_processor_id(); |
0c7a6b21 | 206 | char buf[150]; |
8f65873e | 207 | decode_address(buf, cpu_pda[cpu].retx); |
0c7a6b21 | 208 | printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n", |
8f65873e GY |
209 | (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf); |
210 | decode_address(buf, cpu_pda[cpu].dcplb_fault_addr); | |
0c7a6b21 | 211 | printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf); |
8f65873e | 212 | decode_address(buf, cpu_pda[cpu].icplb_fault_addr); |
0c7a6b21 RG |
213 | printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf); |
214 | ||
215 | decode_address(buf, fp->retx); | |
8f65873e | 216 | printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf); |
0c7a6b21 RG |
217 | } else |
218 | #endif | |
219 | { | |
220 | dump_bfin_process(fp); | |
221 | dump_bfin_mem(fp); | |
222 | show_regs(fp); | |
223 | } | |
9f06c38f | 224 | #endif |
2ebcade5 RG |
225 | panic("Double Fault - unrecoverable event\n"); |
226 | ||
227 | } | |
228 | ||
1394f032 BW |
229 | asmlinkage void trap_c(struct pt_regs *fp) |
230 | { | |
518039bc RG |
231 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON |
232 | int j; | |
8f65873e GY |
233 | #endif |
234 | #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO | |
235 | unsigned int cpu = smp_processor_id(); | |
518039bc RG |
236 | #endif |
237 | int sig = 0; | |
1394f032 BW |
238 | siginfo_t info; |
239 | unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE; | |
240 | ||
226eb1ef RG |
241 | trace_buffer_save(j); |
242 | ||
243 | /* Important - be very careful dereferncing pointers - will lead to | |
244 | * double faults if the stack has become corrupt | |
245 | */ | |
246 | ||
247 | /* If the fault was caused by a kernel thread, or interrupt handler | |
248 | * we will kernel panic, so the system reboots. | |
249 | * If KGDB is enabled, don't set this for kernel breakpoints | |
250 | */ | |
b03b08ba RG |
251 | |
252 | /* TODO: check to see if we are in some sort of deferred HWERR | |
253 | * that we should be able to recover from, not kernel panic | |
254 | */ | |
6b5eace2 | 255 | if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP) |
1394f032 | 256 | #ifdef CONFIG_KGDB |
6b5eace2 | 257 | && (trapnr != VEC_EXCPT02) |
1394f032 | 258 | #endif |
226eb1ef RG |
259 | ){ |
260 | console_verbose(); | |
261 | oops_in_progress = 1; | |
262 | } else if (current) { | |
263 | if (current->mm == NULL) { | |
264 | console_verbose(); | |
265 | oops_in_progress = 1; | |
266 | } | |
267 | } | |
1394f032 BW |
268 | |
269 | /* trap_c() will be called for exceptions. During exceptions | |
270 | * processing, the pc value should be set with retx value. | |
271 | * With this change we can cleanup some code in signal.c- TODO | |
272 | */ | |
273 | fp->orig_pc = fp->retx; | |
274 | /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n", | |
275 | trapnr, fp->ipend, fp->pc, fp->retx); */ | |
276 | ||
277 | /* send the appropriate signal to the user program */ | |
278 | switch (trapnr) { | |
279 | ||
280 | /* This table works in conjuction with the one in ./mach-common/entry.S | |
281 | * Some exceptions are handled there (in assembly, in exception space) | |
282 | * Some are handled here, (in C, in interrupt space) | |
283 | * Some, like CPLB, are handled in both, where the normal path is | |
284 | * handled in assembly/exception space, and the error path is handled | |
285 | * here | |
286 | */ | |
287 | ||
288 | /* 0x00 - Linux Syscall, getting here is an error */ | |
289 | /* 0x01 - userspace gdb breakpoint, handled here */ | |
290 | case VEC_EXCPT01: | |
291 | info.si_code = TRAP_ILLTRAP; | |
292 | sig = SIGTRAP; | |
293 | CHK_DEBUGGER_TRAP_MAYBE(); | |
294 | /* Check if this is a breakpoint in kernel space */ | |
295 | if (fp->ipend & 0xffc0) | |
296 | return; | |
297 | else | |
298 | break; | |
9401e618 | 299 | /* 0x03 - User Defined, userspace stack overflow */ |
1394f032 BW |
300 | case VEC_EXCPT03: |
301 | info.si_code = SEGV_STACKFLOW; | |
302 | sig = SIGSEGV; | |
9f06c38f | 303 | verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE)); |
a5ac0129 | 304 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 | 305 | break; |
27707d3e SZ |
306 | /* 0x02 - KGDB initial connection and break signal trap */ |
307 | case VEC_EXCPT02: | |
308 | #ifdef CONFIG_KGDB | |
309 | info.si_code = TRAP_ILLTRAP; | |
310 | sig = SIGTRAP; | |
311 | CHK_DEBUGGER_TRAP(); | |
312 | return; | |
313 | #endif | |
5c64e0d5 RG |
314 | /* 0x04 - User Defined */ |
315 | /* 0x05 - User Defined */ | |
316 | /* 0x06 - User Defined */ | |
317 | /* 0x07 - User Defined */ | |
318 | /* 0x08 - User Defined */ | |
319 | /* 0x09 - User Defined */ | |
320 | /* 0x0A - User Defined */ | |
321 | /* 0x0B - User Defined */ | |
322 | /* 0x0C - User Defined */ | |
323 | /* 0x0D - User Defined */ | |
324 | /* 0x0E - User Defined */ | |
325 | /* 0x0F - User Defined */ | |
27707d3e | 326 | /* If we got here, it is most likely that someone was trying to use a |
5c64e0d5 RG |
327 | * custom exception handler, and it is not actually installed properly |
328 | */ | |
329 | case VEC_EXCPT04 ... VEC_EXCPT15: | |
330 | info.si_code = ILL_ILLPARAOP; | |
331 | sig = SIGILL; | |
9f06c38f | 332 | verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE)); |
5c64e0d5 RG |
333 | CHK_DEBUGGER_TRAP_MAYBE(); |
334 | break; | |
1394f032 BW |
335 | /* 0x10 HW Single step, handled here */ |
336 | case VEC_STEP: | |
337 | info.si_code = TRAP_STEP; | |
338 | sig = SIGTRAP; | |
339 | CHK_DEBUGGER_TRAP_MAYBE(); | |
340 | /* Check if this is a single step in kernel space */ | |
341 | if (fp->ipend & 0xffc0) | |
342 | return; | |
343 | else | |
344 | break; | |
345 | /* 0x11 - Trace Buffer Full, handled here */ | |
346 | case VEC_OVFLOW: | |
347 | info.si_code = TRAP_TRACEFLOW; | |
348 | sig = SIGTRAP; | |
9f06c38f | 349 | verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE)); |
a5ac0129 | 350 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
351 | break; |
352 | /* 0x12 - Reserved, Caught by default */ | |
353 | /* 0x13 - Reserved, Caught by default */ | |
354 | /* 0x14 - Reserved, Caught by default */ | |
355 | /* 0x15 - Reserved, Caught by default */ | |
356 | /* 0x16 - Reserved, Caught by default */ | |
357 | /* 0x17 - Reserved, Caught by default */ | |
358 | /* 0x18 - Reserved, Caught by default */ | |
359 | /* 0x19 - Reserved, Caught by default */ | |
360 | /* 0x1A - Reserved, Caught by default */ | |
361 | /* 0x1B - Reserved, Caught by default */ | |
362 | /* 0x1C - Reserved, Caught by default */ | |
363 | /* 0x1D - Reserved, Caught by default */ | |
364 | /* 0x1E - Reserved, Caught by default */ | |
365 | /* 0x1F - Reserved, Caught by default */ | |
366 | /* 0x20 - Reserved, Caught by default */ | |
367 | /* 0x21 - Undefined Instruction, handled here */ | |
368 | case VEC_UNDEF_I: | |
369 | info.si_code = ILL_ILLOPC; | |
370 | sig = SIGILL; | |
9f06c38f | 371 | verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE)); |
a5ac0129 | 372 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
373 | break; |
374 | /* 0x22 - Illegal Instruction Combination, handled here */ | |
375 | case VEC_ILGAL_I: | |
376 | info.si_code = ILL_ILLPARAOP; | |
377 | sig = SIGILL; | |
9f06c38f | 378 | verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE)); |
a5ac0129 | 379 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 | 380 | break; |
f26fbc48 | 381 | /* 0x23 - Data CPLB protection violation, handled here */ |
1394f032 BW |
382 | case VEC_CPLB_VL: |
383 | info.si_code = ILL_CPLB_VI; | |
f26fbc48 | 384 | sig = SIGBUS; |
9f06c38f | 385 | verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE)); |
a5ac0129 | 386 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
387 | break; |
388 | /* 0x24 - Data access misaligned, handled here */ | |
389 | case VEC_MISALI_D: | |
390 | info.si_code = BUS_ADRALN; | |
391 | sig = SIGBUS; | |
9f06c38f | 392 | verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE)); |
a5ac0129 | 393 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
394 | break; |
395 | /* 0x25 - Unrecoverable Event, handled here */ | |
396 | case VEC_UNCOV: | |
397 | info.si_code = ILL_ILLEXCPT; | |
398 | sig = SIGILL; | |
9f06c38f | 399 | verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE)); |
a5ac0129 | 400 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
401 | break; |
402 | /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr, | |
403 | error case is handled here */ | |
404 | case VEC_CPLB_M: | |
405 | info.si_code = BUS_ADRALN; | |
406 | sig = SIGBUS; | |
9f06c38f | 407 | verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE)); |
1394f032 BW |
408 | break; |
409 | /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */ | |
410 | case VEC_CPLB_MHIT: | |
411 | info.si_code = ILL_CPLB_MULHIT; | |
1394f032 | 412 | sig = SIGSEGV; |
c6c6f75d | 413 | #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO |
8f65873e | 414 | if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START) |
9f06c38f | 415 | verbose_printk(KERN_NOTICE "NULL pointer access\n"); |
c6c6f75d | 416 | else |
1394f032 | 417 | #endif |
9f06c38f | 418 | verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE)); |
a5ac0129 | 419 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
420 | break; |
421 | /* 0x28 - Emulation Watchpoint, handled here */ | |
422 | case VEC_WATCH: | |
423 | info.si_code = TRAP_WATCHPT; | |
424 | sig = SIGTRAP; | |
569a50ca | 425 | pr_debug(EXC_0x28(KERN_DEBUG)); |
1394f032 BW |
426 | CHK_DEBUGGER_TRAP_MAYBE(); |
427 | /* Check if this is a watchpoint in kernel space */ | |
428 | if (fp->ipend & 0xffc0) | |
429 | return; | |
430 | else | |
431 | break; | |
432 | #ifdef CONFIG_BF535 | |
433 | /* 0x29 - Instruction fetch access error (535 only) */ | |
434 | case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */ | |
435 | info.si_code = BUS_OPFETCH; | |
436 | sig = SIGBUS; | |
9f06c38f | 437 | verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n"); |
a5ac0129 | 438 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
439 | break; |
440 | #else | |
441 | /* 0x29 - Reserved, Caught by default */ | |
442 | #endif | |
443 | /* 0x2A - Instruction fetch misaligned, handled here */ | |
444 | case VEC_MISALI_I: | |
445 | info.si_code = BUS_ADRALN; | |
446 | sig = SIGBUS; | |
9f06c38f | 447 | verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE)); |
a5ac0129 | 448 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 | 449 | break; |
f26fbc48 | 450 | /* 0x2B - Instruction CPLB protection violation, handled here */ |
1394f032 BW |
451 | case VEC_CPLB_I_VL: |
452 | info.si_code = ILL_CPLB_VI; | |
f26fbc48 | 453 | sig = SIGBUS; |
9f06c38f | 454 | verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE)); |
a5ac0129 | 455 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
456 | break; |
457 | /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */ | |
458 | case VEC_CPLB_I_M: | |
459 | info.si_code = ILL_CPLB_MISS; | |
460 | sig = SIGBUS; | |
9f06c38f | 461 | verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE)); |
1394f032 BW |
462 | break; |
463 | /* 0x2D - Instruction CPLB Multiple Hits, handled here */ | |
464 | case VEC_CPLB_I_MHIT: | |
465 | info.si_code = ILL_CPLB_MULHIT; | |
1394f032 | 466 | sig = SIGSEGV; |
c6c6f75d | 467 | #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO |
8f65873e | 468 | if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START) |
9f06c38f | 469 | verbose_printk(KERN_NOTICE "Jump to NULL address\n"); |
c6c6f75d | 470 | else |
1394f032 | 471 | #endif |
9f06c38f | 472 | verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE)); |
a5ac0129 | 473 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
474 | break; |
475 | /* 0x2E - Illegal use of Supervisor Resource, handled here */ | |
476 | case VEC_ILL_RES: | |
477 | info.si_code = ILL_PRVOPC; | |
478 | sig = SIGILL; | |
9f06c38f | 479 | verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE)); |
a5ac0129 | 480 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
481 | break; |
482 | /* 0x2F - Reserved, Caught by default */ | |
483 | /* 0x30 - Reserved, Caught by default */ | |
484 | /* 0x31 - Reserved, Caught by default */ | |
485 | /* 0x32 - Reserved, Caught by default */ | |
486 | /* 0x33 - Reserved, Caught by default */ | |
487 | /* 0x34 - Reserved, Caught by default */ | |
488 | /* 0x35 - Reserved, Caught by default */ | |
489 | /* 0x36 - Reserved, Caught by default */ | |
490 | /* 0x37 - Reserved, Caught by default */ | |
491 | /* 0x38 - Reserved, Caught by default */ | |
492 | /* 0x39 - Reserved, Caught by default */ | |
493 | /* 0x3A - Reserved, Caught by default */ | |
494 | /* 0x3B - Reserved, Caught by default */ | |
495 | /* 0x3C - Reserved, Caught by default */ | |
496 | /* 0x3D - Reserved, Caught by default */ | |
497 | /* 0x3E - Reserved, Caught by default */ | |
498 | /* 0x3F - Reserved, Caught by default */ | |
13fe24f3 RG |
499 | case VEC_HWERR: |
500 | info.si_code = BUS_ADRALN; | |
501 | sig = SIGBUS; | |
502 | switch (fp->seqstat & SEQSTAT_HWERRCAUSE) { | |
503 | /* System MMR Error */ | |
504 | case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR): | |
505 | info.si_code = BUS_ADRALN; | |
506 | sig = SIGBUS; | |
9f06c38f | 507 | verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE)); |
13fe24f3 RG |
508 | break; |
509 | /* External Memory Addressing Error */ | |
510 | case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR): | |
511 | info.si_code = BUS_ADRERR; | |
512 | sig = SIGBUS; | |
9f06c38f | 513 | verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE)); |
13fe24f3 RG |
514 | break; |
515 | /* Performance Monitor Overflow */ | |
516 | case (SEQSTAT_HWERRCAUSE_PERF_FLOW): | |
9f06c38f | 517 | verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE)); |
13fe24f3 RG |
518 | break; |
519 | /* RAISE 5 instruction */ | |
520 | case (SEQSTAT_HWERRCAUSE_RAISE_5): | |
521 | printk(KERN_NOTICE HWC_x18(KERN_NOTICE)); | |
522 | break; | |
523 | default: /* Reserved */ | |
524 | printk(KERN_NOTICE HWC_default(KERN_NOTICE)); | |
525 | break; | |
526 | } | |
a5ac0129 | 527 | CHK_DEBUGGER_TRAP_MAYBE(); |
13fe24f3 | 528 | break; |
5c64e0d5 RG |
529 | /* |
530 | * We should be handling all known exception types above, | |
531 | * if we get here we hit a reserved one, so panic | |
532 | */ | |
1394f032 | 533 | default: |
5c64e0d5 RG |
534 | oops_in_progress = 1; |
535 | info.si_code = ILL_ILLPARAOP; | |
536 | sig = SIGILL; | |
9f06c38f | 537 | verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n", |
1394f032 | 538 | (fp->seqstat & SEQSTAT_EXCAUSE)); |
a5ac0129 | 539 | CHK_DEBUGGER_TRAP_MAYBE(); |
1394f032 BW |
540 | break; |
541 | } | |
542 | ||
226eb1ef RG |
543 | BUG_ON(sig == 0); |
544 | ||
545 | if (sig != SIGTRAP) { | |
49dce912 | 546 | dump_bfin_process(fp); |
b03b08ba | 547 | dump_bfin_mem(fp); |
49dce912 | 548 | show_regs(fp); |
226eb1ef RG |
549 | |
550 | /* Print out the trace buffer if it makes sense */ | |
551 | #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE | |
552 | if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M) | |
9f06c38f | 553 | verbose_printk(KERN_NOTICE "No trace since you do not have " |
226eb1ef RG |
554 | "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n" |
555 | KERN_NOTICE "\n"); | |
556 | else | |
557 | #endif | |
558 | dump_bfin_trace_buffer(); | |
f09630bf | 559 | |
226eb1ef | 560 | if (oops_in_progress) { |
f09630bf | 561 | /* Dump the current kernel stack */ |
9f06c38f | 562 | verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n"); |
f09630bf | 563 | show_stack(current, NULL); |
aee3a292 | 564 | print_modules(); |
226eb1ef | 565 | #ifndef CONFIG_ACCESS_CHECK |
9f06c38f | 566 | verbose_printk(KERN_EMERG "Please turn on " |
90c7f468 | 567 | "CONFIG_ACCESS_CHECK\n"); |
226eb1ef | 568 | #endif |
1394f032 | 569 | panic("Kernel exception"); |
f09630bf | 570 | } else { |
4ee1c453 | 571 | #ifdef CONFIG_DEBUG_VERBOSE |
9f06c38f | 572 | unsigned long *stack; |
f09630bf RG |
573 | /* Dump the user space stack */ |
574 | stack = (unsigned long *)rdusp(); | |
9f06c38f | 575 | verbose_printk(KERN_NOTICE "Userspace Stack\n"); |
f09630bf | 576 | show_stack(NULL, stack); |
9f06c38f | 577 | #endif |
226eb1ef | 578 | } |
1394f032 | 579 | } |
fb322915 | 580 | |
6a01f230 YL |
581 | #ifdef CONFIG_IPIPE |
582 | if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp)) | |
583 | #endif | |
584 | { | |
585 | info.si_signo = sig; | |
586 | info.si_errno = 0; | |
587 | info.si_addr = (void __user *)fp->pc; | |
588 | force_sig_info(sig, &info, current); | |
589 | } | |
1394f032 | 590 | |
1394f032 BW |
591 | trace_buffer_restore(j); |
592 | return; | |
593 | } | |
594 | ||
595 | /* Typical exception handling routines */ | |
596 | ||
518039bc RG |
597 | #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1) |
598 | ||
f09630bf RG |
599 | /* |
600 | * Similar to get_user, do some address checking, then dereference | |
601 | * Return true on sucess, false on bad address | |
602 | */ | |
9f06c38f | 603 | static bool get_instruction(unsigned short *val, unsigned short *address) |
f09630bf RG |
604 | { |
605 | ||
606 | unsigned long addr; | |
607 | ||
608 | addr = (unsigned long)address; | |
609 | ||
610 | /* Check for odd addresses */ | |
611 | if (addr & 0x1) | |
612 | return false; | |
613 | ||
614 | /* Check that things do not wrap around */ | |
615 | if (addr > (addr + 2)) | |
616 | return false; | |
617 | ||
618 | /* | |
619 | * Since we are in exception context, we need to do a little address checking | |
620 | * We need to make sure we are only accessing valid memory, and | |
621 | * we don't read something in the async space that can hang forever | |
622 | */ | |
623 | if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) || | |
07aa7be5 | 624 | #if L2_LENGTH != 0 |
f09630bf RG |
625 | (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) || |
626 | #endif | |
627 | (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) || | |
628 | #if L1_DATA_A_LENGTH != 0 | |
629 | (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) || | |
630 | #endif | |
631 | #if L1_DATA_B_LENGTH != 0 | |
632 | (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) || | |
633 | #endif | |
634 | (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) || | |
635 | (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) && | |
636 | addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) || | |
637 | (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) && | |
638 | addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) || | |
639 | (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) && | |
640 | addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) || | |
641 | (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) && | |
642 | addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) { | |
643 | *val = *address; | |
644 | return true; | |
645 | } | |
646 | ||
647 | #if L1_CODE_LENGTH != 0 | |
648 | if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) { | |
9df10281 | 649 | isram_memcpy(val, address, 2); |
f09630bf RG |
650 | return true; |
651 | } | |
652 | #endif | |
653 | ||
654 | ||
655 | return false; | |
656 | } | |
657 | ||
36f649a5 | 658 | /* |
d3d0ac23 RG |
659 | * decode the instruction if we are printing out the trace, as it |
660 | * makes things easier to follow, without running it through objdump | |
661 | * These are the normal instructions which cause change of flow, which | |
662 | * would be at the source of the trace buffer | |
663 | */ | |
36f649a5 | 664 | #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON) |
9f06c38f | 665 | static void decode_instruction(unsigned short *address) |
d3d0ac23 RG |
666 | { |
667 | unsigned short opcode; | |
668 | ||
669 | if (get_instruction(&opcode, address)) { | |
670 | if (opcode == 0x0010) | |
9f06c38f | 671 | verbose_printk("RTS"); |
d3d0ac23 | 672 | else if (opcode == 0x0011) |
9f06c38f | 673 | verbose_printk("RTI"); |
d3d0ac23 | 674 | else if (opcode == 0x0012) |
9f06c38f | 675 | verbose_printk("RTX"); |
d3d0ac23 | 676 | else if (opcode >= 0x0050 && opcode <= 0x0057) |
9f06c38f | 677 | verbose_printk("JUMP (P%i)", opcode & 7); |
d3d0ac23 | 678 | else if (opcode >= 0x0060 && opcode <= 0x0067) |
9f06c38f | 679 | verbose_printk("CALL (P%i)", opcode & 7); |
d3d0ac23 | 680 | else if (opcode >= 0x0070 && opcode <= 0x0077) |
9f06c38f | 681 | verbose_printk("CALL (PC+P%i)", opcode & 7); |
d3d0ac23 | 682 | else if (opcode >= 0x0080 && opcode <= 0x0087) |
9f06c38f | 683 | verbose_printk("JUMP (PC+P%i)", opcode & 7); |
d3d0ac23 | 684 | else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF)) |
9f06c38f | 685 | verbose_printk("IF !CC JUMP"); |
d3d0ac23 | 686 | else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff)) |
9f06c38f | 687 | verbose_printk("IF CC JUMP"); |
d3d0ac23 | 688 | else if (opcode >= 0x2000 && opcode <= 0x2fff) |
9f06c38f | 689 | verbose_printk("JUMP.S"); |
d3d0ac23 | 690 | else if (opcode >= 0xe080 && opcode <= 0xe0ff) |
9f06c38f | 691 | verbose_printk("LSETUP"); |
d3d0ac23 | 692 | else if (opcode >= 0xe200 && opcode <= 0xe2ff) |
9f06c38f | 693 | verbose_printk("JUMP.L"); |
d3d0ac23 | 694 | else if (opcode >= 0xe300 && opcode <= 0xe3ff) |
9f06c38f | 695 | verbose_printk("CALL pcrel"); |
d3d0ac23 | 696 | else |
9f06c38f | 697 | verbose_printk("0x%04x", opcode); |
d3d0ac23 RG |
698 | } |
699 | ||
700 | } | |
9f06c38f | 701 | #endif |
d3d0ac23 | 702 | |
1394f032 BW |
703 | void dump_bfin_trace_buffer(void) |
704 | { | |
9f06c38f | 705 | #ifdef CONFIG_DEBUG_VERBOSE |
518039bc RG |
706 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON |
707 | int tflags, i = 0; | |
226eb1ef | 708 | char buf[150]; |
d3d0ac23 | 709 | unsigned short *addr; |
518039bc RG |
710 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND |
711 | int j, index; | |
712 | #endif | |
713 | ||
1394f032 BW |
714 | trace_buffer_save(tflags); |
715 | ||
226eb1ef | 716 | printk(KERN_NOTICE "Hardware Trace:\n"); |
518039bc | 717 | |
d3d0ac23 RG |
718 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND |
719 | printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n"); | |
720 | #endif | |
721 | ||
1394f032 | 722 | if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) { |
518039bc | 723 | for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) { |
226eb1ef RG |
724 | decode_address(buf, (unsigned long)bfin_read_TBUF()); |
725 | printk(KERN_NOTICE "%4i Target : %s\n", i, buf); | |
f09630bf RG |
726 | addr = (unsigned short *)bfin_read_TBUF(); |
727 | decode_address(buf, (unsigned long)addr); | |
728 | printk(KERN_NOTICE " Source : %s ", buf); | |
d3d0ac23 | 729 | decode_instruction(addr); |
f09630bf | 730 | printk("\n"); |
1394f032 BW |
731 | } |
732 | } | |
733 | ||
518039bc RG |
734 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND |
735 | if (trace_buff_offset) | |
d3d0ac23 | 736 | index = trace_buff_offset / 4; |
518039bc RG |
737 | else |
738 | index = EXPAND_LEN; | |
739 | ||
740 | j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128; | |
741 | while (j) { | |
226eb1ef RG |
742 | decode_address(buf, software_trace_buff[index]); |
743 | printk(KERN_NOTICE "%4i Target : %s\n", i, buf); | |
518039bc RG |
744 | index -= 1; |
745 | if (index < 0 ) | |
746 | index = EXPAND_LEN; | |
226eb1ef | 747 | decode_address(buf, software_trace_buff[index]); |
d3d0ac23 RG |
748 | printk(KERN_NOTICE " Source : %s ", buf); |
749 | decode_instruction((unsigned short *)software_trace_buff[index]); | |
750 | printk("\n"); | |
518039bc RG |
751 | index -= 1; |
752 | if (index < 0) | |
753 | index = EXPAND_LEN; | |
518039bc RG |
754 | j--; |
755 | i++; | |
756 | } | |
757 | #endif | |
758 | ||
1394f032 | 759 | trace_buffer_restore(tflags); |
518039bc | 760 | #endif |
9f06c38f | 761 | #endif |
1394f032 BW |
762 | } |
763 | EXPORT_SYMBOL(dump_bfin_trace_buffer); | |
764 | ||
f09630bf RG |
765 | /* |
766 | * Checks to see if the address pointed to is either a | |
767 | * 16-bit CALL instruction, or a 32-bit CALL instruction | |
768 | */ | |
9f06c38f | 769 | static bool is_bfin_call(unsigned short *addr) |
1394f032 | 770 | { |
f09630bf RG |
771 | unsigned short opcode = 0, *ins_addr; |
772 | ins_addr = (unsigned short *)addr; | |
1394f032 | 773 | |
f09630bf RG |
774 | if (!get_instruction(&opcode, ins_addr)) |
775 | return false; | |
1394f032 | 776 | |
f09630bf RG |
777 | if ((opcode >= 0x0060 && opcode <= 0x0067) || |
778 | (opcode >= 0x0070 && opcode <= 0x0077)) | |
779 | return true; | |
780 | ||
781 | ins_addr--; | |
782 | if (!get_instruction(&opcode, ins_addr)) | |
783 | return false; | |
1394f032 | 784 | |
f09630bf RG |
785 | if (opcode >= 0xE300 && opcode <= 0xE3FF) |
786 | return true; | |
787 | ||
788 | return false; | |
789 | ||
790 | } | |
9f06c38f | 791 | |
1394f032 BW |
792 | void show_stack(struct task_struct *task, unsigned long *stack) |
793 | { | |
9f06c38f | 794 | #ifdef CONFIG_PRINTK |
f09630bf RG |
795 | unsigned int *addr, *endstack, *fp = 0, *frame; |
796 | unsigned short *ins_addr; | |
797 | char buf[150]; | |
798 | unsigned int i, j, ret_addr, frame_no = 0; | |
1394f032 | 799 | |
f09630bf RG |
800 | /* |
801 | * If we have been passed a specific stack, use that one otherwise | |
802 | * if we have been passed a task structure, use that, otherwise | |
803 | * use the stack of where the variable "stack" exists | |
1394f032 BW |
804 | */ |
805 | ||
f09630bf RG |
806 | if (stack == NULL) { |
807 | if (task) { | |
808 | /* We know this is a kernel stack, so this is the start/end */ | |
1394f032 | 809 | stack = (unsigned long *)task->thread.ksp; |
f09630bf RG |
810 | endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE); |
811 | } else { | |
812 | /* print out the existing stack info */ | |
1394f032 | 813 | stack = (unsigned long *)&stack; |
f09630bf RG |
814 | endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack); |
815 | } | |
816 | } else | |
817 | endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack); | |
818 | ||
9f06c38f | 819 | printk(KERN_NOTICE "Stack info:\n"); |
f09630bf | 820 | decode_address(buf, (unsigned int)stack); |
9f06c38f RG |
821 | printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf); |
822 | ||
f09630bf RG |
823 | addr = (unsigned int *)((unsigned int)stack & ~0x3F); |
824 | ||
825 | /* First thing is to look for a frame pointer */ | |
826 | for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0; | |
827 | addr < endstack; addr++, i++) { | |
828 | if (*addr & 0x1) | |
829 | continue; | |
830 | ins_addr = (unsigned short *)*addr; | |
831 | ins_addr--; | |
832 | if (is_bfin_call(ins_addr)) | |
833 | fp = addr - 1; | |
834 | ||
835 | if (fp) { | |
836 | /* Let's check to see if it is a frame pointer */ | |
837 | while (fp >= (addr - 1) && fp < endstack && fp) | |
838 | fp = (unsigned int *)*fp; | |
839 | if (fp == 0 || fp == endstack) { | |
840 | fp = addr - 1; | |
841 | break; | |
842 | } | |
843 | fp = 0; | |
844 | } | |
1394f032 | 845 | } |
f09630bf RG |
846 | if (fp) { |
847 | frame = fp; | |
b339dc79 | 848 | printk(KERN_NOTICE " FP: (0x%p)\n", fp); |
f09630bf RG |
849 | } else |
850 | frame = 0; | |
1394f032 | 851 | |
f09630bf RG |
852 | /* |
853 | * Now that we think we know where things are, we | |
854 | * walk the stack again, this time printing things out | |
855 | * incase there is no frame pointer, we still look for | |
856 | * valid return addresses | |
857 | */ | |
1394f032 | 858 | |
f09630bf RG |
859 | /* First time print out data, next time, print out symbols */ |
860 | for (j = 0; j <= 1; j++) { | |
861 | if (j) | |
862 | printk(KERN_NOTICE "Return addresses in stack:\n"); | |
863 | else | |
864 | printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack); | |
865 | ||
866 | fp = frame; | |
867 | frame_no = 0; | |
868 | ||
869 | for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0; | |
870 | addr <= endstack; addr++, i++) { | |
871 | ||
872 | ret_addr = 0; | |
873 | if (!j && i % 8 == 0) | |
874 | printk("\n" KERN_NOTICE "%p:",addr); | |
875 | ||
876 | /* if it is an odd address, or zero, just skip it */ | |
877 | if (*addr & 0x1 || !*addr) | |
878 | goto print; | |
879 | ||
880 | ins_addr = (unsigned short *)*addr; | |
881 | ||
882 | /* Go back one instruction, and see if it is a CALL */ | |
883 | ins_addr--; | |
884 | ret_addr = is_bfin_call(ins_addr); | |
885 | print: | |
886 | if (!j && stack == (unsigned long *)addr) | |
887 | printk("[%08x]", *addr); | |
888 | else if (ret_addr) | |
889 | if (j) { | |
890 | decode_address(buf, (unsigned int)*addr); | |
891 | if (frame == addr) { | |
892 | printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf); | |
893 | continue; | |
894 | } | |
895 | printk(KERN_NOTICE " address : %s\n", buf); | |
896 | } else | |
897 | printk("<%08x>", *addr); | |
898 | else if (fp == addr) { | |
899 | if (j) | |
900 | frame = addr+1; | |
901 | else | |
902 | printk("(%08x)", *addr); | |
903 | ||
904 | fp = (unsigned int *)*addr; | |
905 | frame_no++; | |
906 | ||
907 | } else if (!j) | |
908 | printk(" %08x ", *addr); | |
909 | } | |
910 | if (!j) | |
911 | printk("\n"); | |
1394f032 | 912 | } |
9f06c38f | 913 | #endif |
1394f032 BW |
914 | } |
915 | ||
916 | void dump_stack(void) | |
917 | { | |
918 | unsigned long stack; | |
518039bc | 919 | #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON |
1394f032 | 920 | int tflags; |
518039bc | 921 | #endif |
1394f032 BW |
922 | trace_buffer_save(tflags); |
923 | dump_bfin_trace_buffer(); | |
924 | show_stack(current, &stack); | |
925 | trace_buffer_restore(tflags); | |
926 | } | |
1394f032 BW |
927 | EXPORT_SYMBOL(dump_stack); |
928 | ||
49dce912 | 929 | void dump_bfin_process(struct pt_regs *fp) |
1394f032 | 930 | { |
9f06c38f | 931 | #ifdef CONFIG_DEBUG_VERBOSE |
49dce912 MF |
932 | /* We should be able to look at fp->ipend, but we don't push it on the |
933 | * stack all the time, so do this until we fix that */ | |
934 | unsigned int context = bfin_read_IPEND(); | |
935 | ||
936 | if (oops_in_progress) | |
9f06c38f | 937 | verbose_printk(KERN_EMERG "Kernel OOPS in progress\n"); |
49dce912 | 938 | |
b03b08ba | 939 | if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) |
9f06c38f | 940 | verbose_printk(KERN_NOTICE "HW Error context\n"); |
b03b08ba | 941 | else if (context & 0x0020) |
9f06c38f | 942 | verbose_printk(KERN_NOTICE "Deferred Exception context\n"); |
49dce912 | 943 | else if (context & 0x3FC0) |
9f06c38f | 944 | verbose_printk(KERN_NOTICE "Interrupt context\n"); |
49dce912 | 945 | else if (context & 0x4000) |
9f06c38f | 946 | verbose_printk(KERN_NOTICE "Deferred Interrupt context\n"); |
49dce912 | 947 | else if (context & 0x8000) |
9f06c38f | 948 | verbose_printk(KERN_NOTICE "Kernel process context\n"); |
49dce912 | 949 | |
9a62ca40 RG |
950 | /* Because we are crashing, and pointers could be bad, we check things |
951 | * pretty closely before we use them | |
952 | */ | |
7f1c9068 RG |
953 | if ((unsigned long)current >= FIXED_CODE_START && |
954 | !((unsigned long)current & 0x3) && current->pid) { | |
9f06c38f | 955 | verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n"); |
9a62ca40 | 956 | if (current->comm >= (char *)FIXED_CODE_START) |
9f06c38f | 957 | verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n", |
9a62ca40 RG |
958 | current->comm, current->pid); |
959 | else | |
9f06c38f | 960 | verbose_printk(KERN_NOTICE "COMM= invalid\n"); |
9a62ca40 | 961 | |
8f65873e | 962 | printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu); |
9a62ca40 | 963 | if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START) |
9f06c38f | 964 | verbose_printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n" |
9a62ca40 RG |
965 | KERN_NOTICE " BSS = 0x%p-0x%p USER-STACK = 0x%p\n" |
966 | KERN_NOTICE "\n", | |
967 | (void *)current->mm->start_code, | |
968 | (void *)current->mm->end_code, | |
969 | (void *)current->mm->start_data, | |
970 | (void *)current->mm->end_data, | |
971 | (void *)current->mm->end_data, | |
972 | (void *)current->mm->brk, | |
973 | (void *)current->mm->start_stack); | |
974 | else | |
9f06c38f | 975 | verbose_printk(KERN_NOTICE "invalid mm\n"); |
49dce912 | 976 | } else |
9f06c38f | 977 | verbose_printk(KERN_NOTICE "\n" KERN_NOTICE |
49dce912 | 978 | "No Valid process in current context\n"); |
9f06c38f | 979 | #endif |
49dce912 | 980 | } |
226eb1ef | 981 | |
b03b08ba | 982 | void dump_bfin_mem(struct pt_regs *fp) |
49dce912 | 983 | { |
9f06c38f | 984 | #ifdef CONFIG_DEBUG_VERBOSE |
b03b08ba RG |
985 | unsigned short *addr, *erraddr, val = 0, err = 0; |
986 | char sti = 0, buf[6]; | |
1394f032 | 987 | |
5d750b9e | 988 | erraddr = (void *)fp->pc; |
b03b08ba | 989 | |
9f06c38f | 990 | verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr); |
b03b08ba RG |
991 | |
992 | for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10; | |
993 | addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10; | |
994 | addr++) { | |
995 | if (!((unsigned long)addr & 0xF)) | |
9f06c38f | 996 | verbose_printk("\n" KERN_NOTICE "0x%p: ", addr); |
b03b08ba | 997 | |
7d98c881 | 998 | if (!get_instruction(&val, addr)) { |
b03b08ba RG |
999 | val = 0; |
1000 | sprintf(buf, "????"); | |
b03b08ba RG |
1001 | } else |
1002 | sprintf(buf, "%04x", val); | |
1003 | ||
1004 | if (addr == erraddr) { | |
9f06c38f | 1005 | verbose_printk("[%s]", buf); |
b03b08ba RG |
1006 | err = val; |
1007 | } else | |
9f06c38f | 1008 | verbose_printk(" %s ", buf); |
b03b08ba RG |
1009 | |
1010 | /* Do any previous instructions turn on interrupts? */ | |
1011 | if (addr <= erraddr && /* in the past */ | |
1012 | ((val >= 0x0040 && val <= 0x0047) || /* STI instruction */ | |
1013 | val == 0x017b)) /* [SP++] = RETI */ | |
1014 | sti = 1; | |
1015 | } | |
1016 | ||
9f06c38f | 1017 | verbose_printk("\n"); |
b03b08ba RG |
1018 | |
1019 | /* Hardware error interrupts can be deferred */ | |
1020 | if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR && | |
1021 | oops_in_progress)){ | |
9f06c38f | 1022 | verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n"); |
1394f032 | 1023 | #ifndef CONFIG_DEBUG_HWERR |
9f06c38f | 1024 | verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n" |
b03b08ba RG |
1025 | KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a" |
1026 | " better idea where it came from\n"); | |
1027 | #else | |
1028 | /* If we are handling only one peripheral interrupt | |
1029 | * and current mm and pid are valid, and the last error | |
1030 | * was in that user space process's text area | |
1031 | * print it out - because that is where the problem exists | |
1032 | */ | |
1033 | if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) && | |
1034 | (current->pid && current->mm)) { | |
1035 | /* And the last RETI points to the current userspace context */ | |
1036 | if ((fp + 1)->pc >= current->mm->start_code && | |
1037 | (fp + 1)->pc <= current->mm->end_code) { | |
9f06c38f RG |
1038 | verbose_printk(KERN_NOTICE "It might be better to look around here : \n"); |
1039 | verbose_printk(KERN_NOTICE "-------------------------------------------\n"); | |
b03b08ba | 1040 | show_regs(fp + 1); |
9f06c38f | 1041 | verbose_printk(KERN_NOTICE "-------------------------------------------\n"); |
b03b08ba | 1042 | } |
1394f032 | 1043 | } |
b03b08ba RG |
1044 | #endif |
1045 | } | |
9f06c38f | 1046 | #endif |
49dce912 MF |
1047 | } |
1048 | ||
1049 | void show_regs(struct pt_regs *fp) | |
1050 | { | |
9f06c38f | 1051 | #ifdef CONFIG_DEBUG_VERBOSE |
49dce912 | 1052 | char buf [150]; |
d8f66c8c RG |
1053 | struct irqaction *action; |
1054 | unsigned int i; | |
1055 | unsigned long flags; | |
8f65873e | 1056 | unsigned int cpu = smp_processor_id(); |
226eb1ef | 1057 | |
9f06c38f RG |
1058 | verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted()); |
1059 | verbose_printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n", | |
226eb1ef | 1060 | (long)fp->seqstat, fp->ipend, fp->syscfg); |
1d5ff7e2 | 1061 | if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) { |
9f06c38f | 1062 | verbose_printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n", |
1d5ff7e2 RG |
1063 | (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14); |
1064 | #ifdef EBIU_ERRMST | |
1065 | /* If the error was from the EBIU, print it out */ | |
1066 | if (bfin_read_EBIU_ERRMST() & CORE_ERROR) { | |
9f06c38f | 1067 | verbose_printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n", |
1d5ff7e2 | 1068 | bfin_read_EBIU_ERRMST()); |
9f06c38f | 1069 | verbose_printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n", |
1d5ff7e2 RG |
1070 | bfin_read_EBIU_ERRADD()); |
1071 | } | |
1072 | #endif | |
1073 | } | |
9f06c38f | 1074 | verbose_printk(KERN_NOTICE " EXCAUSE : 0x%lx\n", |
13fe24f3 | 1075 | fp->seqstat & SEQSTAT_EXCAUSE); |
d8f66c8c RG |
1076 | for (i = 6; i <= 15 ; i++) { |
1077 | if (fp->ipend & (1 << i)) { | |
1078 | decode_address(buf, bfin_read32(EVT0 + 4*i)); | |
9f06c38f | 1079 | verbose_printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf); |
d8f66c8c RG |
1080 | } |
1081 | } | |
1082 | ||
1083 | /* if no interrupts are going off, don't print this out */ | |
1084 | if (fp->ipend & ~0x3F) { | |
1085 | for (i = 0; i < (NR_IRQS - 1); i++) { | |
1086 | spin_lock_irqsave(&irq_desc[i].lock, flags); | |
1087 | action = irq_desc[i].action; | |
1088 | if (!action) | |
1089 | goto unlock; | |
1090 | ||
1091 | decode_address(buf, (unsigned int)action->handler); | |
9f06c38f | 1092 | verbose_printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf); |
d8f66c8c RG |
1093 | for (action = action->next; action; action = action->next) { |
1094 | decode_address(buf, (unsigned int)action->handler); | |
9f06c38f | 1095 | verbose_printk(", %s", buf); |
d8f66c8c | 1096 | } |
9f06c38f | 1097 | verbose_printk("\n"); |
d8f66c8c RG |
1098 | unlock: |
1099 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
1100 | } | |
1101 | } | |
c5d88d9e | 1102 | |
226eb1ef | 1103 | decode_address(buf, fp->rete); |
9f06c38f | 1104 | verbose_printk(KERN_NOTICE " RETE: %s\n", buf); |
226eb1ef | 1105 | decode_address(buf, fp->retn); |
9f06c38f | 1106 | verbose_printk(KERN_NOTICE " RETN: %s\n", buf); |
226eb1ef | 1107 | decode_address(buf, fp->retx); |
9f06c38f | 1108 | verbose_printk(KERN_NOTICE " RETX: %s\n", buf); |
226eb1ef | 1109 | decode_address(buf, fp->rets); |
9f06c38f | 1110 | verbose_printk(KERN_NOTICE " RETS: %s\n", buf); |
49dce912 | 1111 | decode_address(buf, fp->pc); |
9f06c38f | 1112 | verbose_printk(KERN_NOTICE " PC : %s\n", buf); |
c5d88d9e | 1113 | |
13fe24f3 RG |
1114 | if (((long)fp->seqstat & SEQSTAT_EXCAUSE) && |
1115 | (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) { | |
8f65873e | 1116 | decode_address(buf, cpu_pda[cpu].dcplb_fault_addr); |
9f06c38f | 1117 | verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf); |
8f65873e | 1118 | decode_address(buf, cpu_pda[cpu].icplb_fault_addr); |
9f06c38f | 1119 | verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf); |
226eb1ef RG |
1120 | } |
1121 | ||
9f06c38f RG |
1122 | verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n"); |
1123 | verbose_printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", | |
c5d88d9e | 1124 | fp->r0, fp->r1, fp->r2, fp->r3); |
9f06c38f | 1125 | verbose_printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", |
c5d88d9e | 1126 | fp->r4, fp->r5, fp->r6, fp->r7); |
9f06c38f | 1127 | verbose_printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n", |
c5d88d9e | 1128 | fp->p0, fp->p1, fp->p2, fp->p3); |
9f06c38f | 1129 | verbose_printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n", |
226eb1ef | 1130 | fp->p4, fp->p5, fp->fp, (long)fp); |
9f06c38f | 1131 | verbose_printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n", |
c5d88d9e | 1132 | fp->lb0, fp->lt0, fp->lc0); |
9f06c38f | 1133 | verbose_printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n", |
c5d88d9e | 1134 | fp->lb1, fp->lt1, fp->lc1); |
9f06c38f | 1135 | verbose_printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n", |
c5d88d9e | 1136 | fp->b0, fp->l0, fp->m0, fp->i0); |
9f06c38f | 1137 | verbose_printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n", |
c5d88d9e | 1138 | fp->b1, fp->l1, fp->m1, fp->i1); |
9f06c38f | 1139 | verbose_printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n", |
c5d88d9e | 1140 | fp->b2, fp->l2, fp->m2, fp->i2); |
9f06c38f | 1141 | verbose_printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n", |
c5d88d9e | 1142 | fp->b3, fp->l3, fp->m3, fp->i3); |
9f06c38f | 1143 | verbose_printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n", |
226eb1ef | 1144 | fp->a0w, fp->a0x, fp->a1w, fp->a1x); |
c5d88d9e | 1145 | |
9f06c38f | 1146 | verbose_printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n", |
c5d88d9e | 1147 | rdusp(), fp->astat); |
1394f032 | 1148 | |
9f06c38f RG |
1149 | verbose_printk(KERN_NOTICE "\n"); |
1150 | #endif | |
1394f032 BW |
1151 | } |
1152 | ||
1153 | #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1 | |
1154 | asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text)); | |
1155 | #endif | |
1156 | ||
8f65873e GY |
1157 | static DEFINE_SPINLOCK(bfin_spinlock_lock); |
1158 | ||
1159 | asmlinkage int sys_bfin_spinlock(int *p) | |
1394f032 | 1160 | { |
8f65873e | 1161 | int ret, tmp = 0; |
1394f032 | 1162 | |
8f65873e GY |
1163 | spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */ |
1164 | ret = get_user(tmp, p); | |
1165 | if (likely(ret == 0)) { | |
1166 | if (unlikely(tmp)) | |
1394f032 | 1167 | ret = 1; |
8f65873e GY |
1168 | else |
1169 | put_user(1, p); | |
1394f032 | 1170 | } |
8f65873e | 1171 | spin_unlock(&bfin_spinlock_lock); |
1394f032 BW |
1172 | return ret; |
1173 | } | |
1174 | ||
1ffe6646 MF |
1175 | int bfin_request_exception(unsigned int exception, void (*handler)(void)) |
1176 | { | |
1177 | void (*curr_handler)(void); | |
1178 | ||
1179 | if (exception > 0x3F) | |
1180 | return -EINVAL; | |
1181 | ||
1182 | curr_handler = ex_table[exception]; | |
1183 | ||
1184 | if (curr_handler != ex_replaceable) | |
1185 | return -EBUSY; | |
1186 | ||
1187 | ex_table[exception] = handler; | |
1188 | ||
1189 | return 0; | |
1190 | } | |
1191 | EXPORT_SYMBOL(bfin_request_exception); | |
1192 | ||
1193 | int bfin_free_exception(unsigned int exception, void (*handler)(void)) | |
1194 | { | |
1195 | void (*curr_handler)(void); | |
1196 | ||
1197 | if (exception > 0x3F) | |
1198 | return -EINVAL; | |
1199 | ||
1200 | curr_handler = ex_table[exception]; | |
1201 | ||
1202 | if (curr_handler != handler) | |
1203 | return -EBUSY; | |
1204 | ||
1205 | ex_table[exception] = ex_replaceable; | |
1206 | ||
1207 | return 0; | |
1208 | } | |
1209 | EXPORT_SYMBOL(bfin_free_exception); | |
1210 | ||
1394f032 BW |
1211 | void panic_cplb_error(int cplb_panic, struct pt_regs *fp) |
1212 | { | |
1213 | switch (cplb_panic) { | |
1214 | case CPLB_NO_UNLOCKED: | |
1215 | printk(KERN_EMERG "All CPLBs are locked\n"); | |
1216 | break; | |
1217 | case CPLB_PROT_VIOL: | |
1218 | return; | |
1219 | case CPLB_NO_ADDR_MATCH: | |
1220 | return; | |
1221 | case CPLB_UNKNOWN_ERR: | |
1222 | printk(KERN_EMERG "Unknown CPLB Exception\n"); | |
1223 | break; | |
1224 | } | |
1225 | ||
226eb1ef RG |
1226 | oops_in_progress = 1; |
1227 | ||
49dce912 | 1228 | dump_bfin_process(fp); |
b03b08ba | 1229 | dump_bfin_mem(fp); |
49dce912 | 1230 | show_regs(fp); |
1394f032 BW |
1231 | dump_stack(); |
1232 | panic("Unrecoverable event\n"); | |
1233 | } |