blob: 9369836365bb72a2573774b84755868de4923f76 [file] [log] [blame]
Bryan Wu1394f032007-05-06 14:50:22 -07001/*
Robin Getz2a12c462010-03-11 16:24:18 +00002 * Main exception handling logic.
3 *
4 * Copyright 2004-2010 Analog Devices Inc.
Bryan Wu1394f032007-05-06 14:50:22 -07005 *
Robin Getz96f10502009-09-24 14:11:24 +00006 * Licensed under the GPL-2 or later
Bryan Wu1394f032007-05-06 14:50:22 -07007 */
8
Mike Frysinger70f12562009-06-07 17:18:25 -04009#include <linux/bug.h>
Mike Frysinger1f83b8f2007-07-12 22:58:21 +080010#include <linux/uaccess.h>
Bryan Wu1394f032007-05-06 14:50:22 -070011#include <linux/module.h>
Mike Frysinger1f83b8f2007-07-12 22:58:21 +080012#include <asm/traps.h>
Mike Frysingerf4585a02008-10-13 14:45:21 +080013#include <asm/cplb.h>
Mike Frysinger1f83b8f2007-07-12 22:58:21 +080014#include <asm/blackfin.h>
15#include <asm/irq_handler.h>
Robin Getzd8f66c82007-12-24 15:27:56 +080016#include <linux/irq.h>
Mike Frysinger1f83b8f2007-07-12 22:58:21 +080017#include <asm/trace.h>
Robin Getz226eb1e2007-10-29 17:59:07 +080018#include <asm/fixed_code.h>
Robin Getz6ce3e9c2010-03-16 14:40:17 +000019#include <asm/pseudo_instructions.h>
Bryan Wu1394f032007-05-06 14:50:22 -070020
21#ifdef CONFIG_KGDB
Bryan Wu1394f032007-05-06 14:50:22 -070022# include <linux/kgdb.h>
Robin Getz226eb1e2007-10-29 17:59:07 +080023
24# define CHK_DEBUGGER_TRAP() \
25 do { \
Sonic Zhanga5ac0122008-10-13 14:07:19 +080026 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
Robin Getz226eb1e2007-10-29 17:59:07 +080027 } while (0)
28# define CHK_DEBUGGER_TRAP_MAYBE() \
29 do { \
30 if (kgdb_connected) \
31 CHK_DEBUGGER_TRAP(); \
32 } while (0)
33#else
34# define CHK_DEBUGGER_TRAP() do { } while (0)
35# define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
Bryan Wu1394f032007-05-06 14:50:22 -070036#endif
37
Robin Getz9f06c382008-10-10 18:13:21 +080038
Robin Getz4ee1c452008-10-28 11:36:11 +080039#ifdef CONFIG_DEBUG_VERBOSE
Robin Getz9f06c382008-10-10 18:13:21 +080040#define verbose_printk(fmt, arg...) \
41 printk(fmt, ##arg)
42#else
43#define verbose_printk(fmt, arg...) \
44 ({ if (0) printk(fmt, ##arg); 0; })
45#endif
46
Robin Getz81f7f452009-06-03 18:58:26 +000047#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
48u32 last_seqstat;
49#ifdef CONFIG_DEBUG_MMRS_MODULE
50EXPORT_SYMBOL(last_seqstat);
51#endif
52#endif
53
Bryan Wu1394f032007-05-06 14:50:22 -070054/* Initiate the event table handler */
55void __init trap_init(void)
56{
57 CSYNC();
58 bfin_write_EVT3(trap);
59 CSYNC();
60}
61
Mike Frysinger82bd1d72009-06-07 17:08:28 -040062static int kernel_mode_regs(struct pt_regs *regs)
63{
64 return regs->ipend & 0xffc0;
65}
66
Yi Lic4baebf2009-08-12 23:05:35 +000067asmlinkage notrace void trap_c(struct pt_regs *fp)
Bryan Wu1394f032007-05-06 14:50:22 -070068{
Robin Getz518039b2007-07-25 11:03:28 +080069#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
70 int j;
71#endif
Robin Getz6ce3e9c2010-03-16 14:40:17 +000072#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
73 int opcode;
74#endif
Yi Lib6dbde22009-08-20 04:17:47 +000075 unsigned int cpu = raw_smp_processor_id();
Mike Frysinger82bd1d72009-06-07 17:08:28 -040076 const char *strerror = NULL;
Robin Getz518039b2007-07-25 11:03:28 +080077 int sig = 0;
Bryan Wu1394f032007-05-06 14:50:22 -070078 siginfo_t info;
79 unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
80
Bryan Wu1394f032007-05-06 14:50:22 -070081 trace_buffer_save(j);
Robin Getz81f7f452009-06-03 18:58:26 +000082#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
83 last_seqstat = (u32)fp->seqstat;
84#endif
Bryan Wu1394f032007-05-06 14:50:22 -070085
Robin Getz226eb1e2007-10-29 17:59:07 +080086 /* Important - be very careful dereferncing pointers - will lead to
87 * double faults if the stack has become corrupt
88 */
89
Bryan Wu1394f032007-05-06 14:50:22 -070090 /* trap_c() will be called for exceptions. During exceptions
91 * processing, the pc value should be set with retx value.
92 * With this change we can cleanup some code in signal.c- TODO
93 */
94 fp->orig_pc = fp->retx;
95 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
96 trapnr, fp->ipend, fp->pc, fp->retx); */
97
98 /* send the appropriate signal to the user program */
99 switch (trapnr) {
100
101 /* This table works in conjuction with the one in ./mach-common/entry.S
102 * Some exceptions are handled there (in assembly, in exception space)
103 * Some are handled here, (in C, in interrupt space)
104 * Some, like CPLB, are handled in both, where the normal path is
105 * handled in assembly/exception space, and the error path is handled
106 * here
107 */
108
109 /* 0x00 - Linux Syscall, getting here is an error */
110 /* 0x01 - userspace gdb breakpoint, handled here */
111 case VEC_EXCPT01:
112 info.si_code = TRAP_ILLTRAP;
113 sig = SIGTRAP;
114 CHK_DEBUGGER_TRAP_MAYBE();
115 /* Check if this is a breakpoint in kernel space */
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400116 if (kernel_mode_regs(fp))
Mike Frysinger6510a202009-06-07 15:07:25 -0400117 goto traps_done;
Bryan Wu1394f032007-05-06 14:50:22 -0700118 else
119 break;
Mike Frysinger9401e612007-07-12 11:50:43 +0800120 /* 0x03 - User Defined, userspace stack overflow */
Bryan Wu1394f032007-05-06 14:50:22 -0700121 case VEC_EXCPT03:
122 info.si_code = SEGV_STACKFLOW;
123 sig = SIGSEGV;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400124 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800125 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700126 break;
Sonic Zhang27707d32008-10-09 14:04:41 +0800127 /* 0x02 - KGDB initial connection and break signal trap */
128 case VEC_EXCPT02:
129#ifdef CONFIG_KGDB
130 info.si_code = TRAP_ILLTRAP;
131 sig = SIGTRAP;
132 CHK_DEBUGGER_TRAP();
Mike Frysinger6510a202009-06-07 15:07:25 -0400133 goto traps_done;
Sonic Zhang27707d32008-10-09 14:04:41 +0800134#endif
Robin Getz5c64e0d2008-10-08 14:43:47 +0800135 /* 0x04 - User Defined */
136 /* 0x05 - User Defined */
137 /* 0x06 - User Defined */
138 /* 0x07 - User Defined */
139 /* 0x08 - User Defined */
140 /* 0x09 - User Defined */
141 /* 0x0A - User Defined */
142 /* 0x0B - User Defined */
143 /* 0x0C - User Defined */
144 /* 0x0D - User Defined */
145 /* 0x0E - User Defined */
146 /* 0x0F - User Defined */
Sonic Zhang27707d32008-10-09 14:04:41 +0800147 /* If we got here, it is most likely that someone was trying to use a
Robin Getz5c64e0d2008-10-08 14:43:47 +0800148 * custom exception handler, and it is not actually installed properly
149 */
150 case VEC_EXCPT04 ... VEC_EXCPT15:
151 info.si_code = ILL_ILLPARAOP;
152 sig = SIGILL;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400153 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
Robin Getz5c64e0d2008-10-08 14:43:47 +0800154 CHK_DEBUGGER_TRAP_MAYBE();
155 break;
Bryan Wu1394f032007-05-06 14:50:22 -0700156 /* 0x10 HW Single step, handled here */
157 case VEC_STEP:
158 info.si_code = TRAP_STEP;
159 sig = SIGTRAP;
160 CHK_DEBUGGER_TRAP_MAYBE();
161 /* Check if this is a single step in kernel space */
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400162 if (kernel_mode_regs(fp))
Mike Frysinger6510a202009-06-07 15:07:25 -0400163 goto traps_done;
Bryan Wu1394f032007-05-06 14:50:22 -0700164 else
165 break;
166 /* 0x11 - Trace Buffer Full, handled here */
167 case VEC_OVFLOW:
168 info.si_code = TRAP_TRACEFLOW;
169 sig = SIGTRAP;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400170 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800171 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700172 break;
173 /* 0x12 - Reserved, Caught by default */
174 /* 0x13 - Reserved, Caught by default */
175 /* 0x14 - Reserved, Caught by default */
176 /* 0x15 - Reserved, Caught by default */
177 /* 0x16 - Reserved, Caught by default */
178 /* 0x17 - Reserved, Caught by default */
179 /* 0x18 - Reserved, Caught by default */
180 /* 0x19 - Reserved, Caught by default */
181 /* 0x1A - Reserved, Caught by default */
182 /* 0x1B - Reserved, Caught by default */
183 /* 0x1C - Reserved, Caught by default */
184 /* 0x1D - Reserved, Caught by default */
185 /* 0x1E - Reserved, Caught by default */
186 /* 0x1F - Reserved, Caught by default */
187 /* 0x20 - Reserved, Caught by default */
188 /* 0x21 - Undefined Instruction, handled here */
189 case VEC_UNDEF_I:
Mike Frysinger70f12562009-06-07 17:18:25 -0400190#ifdef CONFIG_BUG
191 if (kernel_mode_regs(fp)) {
192 switch (report_bug(fp->pc, fp)) {
193 case BUG_TRAP_TYPE_NONE:
194 break;
195 case BUG_TRAP_TYPE_WARN:
196 dump_bfin_trace_buffer();
197 fp->pc += 2;
198 goto traps_done;
199 case BUG_TRAP_TYPE_BUG:
200 /* call to panic() will dump trace, and it is
201 * off at this point, so it won't be clobbered
202 */
203 panic("BUG()");
204 }
205 }
206#endif
Robin Getz6ce3e9c2010-03-16 14:40:17 +0000207#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
208 /*
209 * Support for the fake instructions, if the instruction fails,
210 * then just execute a illegal opcode failure (like normal).
211 * Don't support these instructions inside the kernel
212 */
213 if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
214 if (execute_pseudodbg_assert(fp, opcode))
215 goto traps_done;
216 }
217#endif
Bryan Wu1394f032007-05-06 14:50:22 -0700218 info.si_code = ILL_ILLOPC;
219 sig = SIGILL;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400220 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800221 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700222 break;
223 /* 0x22 - Illegal Instruction Combination, handled here */
224 case VEC_ILGAL_I:
225 info.si_code = ILL_ILLPARAOP;
226 sig = SIGILL;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400227 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800228 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700229 break;
Robin Getzf26fbc42007-11-12 22:21:30 +0800230 /* 0x23 - Data CPLB protection violation, handled here */
Bryan Wu1394f032007-05-06 14:50:22 -0700231 case VEC_CPLB_VL:
232 info.si_code = ILL_CPLB_VI;
Graf Yang36b84122009-07-21 02:26:57 +0000233 sig = SIGSEGV;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400234 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800235 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700236 break;
237 /* 0x24 - Data access misaligned, handled here */
238 case VEC_MISALI_D:
239 info.si_code = BUS_ADRALN;
240 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400241 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800242 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700243 break;
244 /* 0x25 - Unrecoverable Event, handled here */
245 case VEC_UNCOV:
246 info.si_code = ILL_ILLEXCPT;
247 sig = SIGILL;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400248 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800249 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700250 break;
251 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
252 error case is handled here */
253 case VEC_CPLB_M:
254 info.si_code = BUS_ADRALN;
255 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400256 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
Bryan Wu1394f032007-05-06 14:50:22 -0700257 break;
258 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
259 case VEC_CPLB_MHIT:
260 info.si_code = ILL_CPLB_MULHIT;
Bryan Wu1394f032007-05-06 14:50:22 -0700261 sig = SIGSEGV;
Mike Frysingerc6c6f752008-05-17 16:18:08 +0800262#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
Graf Yang8f658732008-11-18 17:48:22 +0800263 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400264 strerror = KERN_NOTICE "NULL pointer access\n";
Mike Frysingerc6c6f752008-05-17 16:18:08 +0800265 else
Bryan Wu1394f032007-05-06 14:50:22 -0700266#endif
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400267 strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800268 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700269 break;
270 /* 0x28 - Emulation Watchpoint, handled here */
271 case VEC_WATCH:
272 info.si_code = TRAP_WATCHPT;
273 sig = SIGTRAP;
Robin Getz569a50c2007-11-21 16:35:57 +0800274 pr_debug(EXC_0x28(KERN_DEBUG));
Bryan Wu1394f032007-05-06 14:50:22 -0700275 CHK_DEBUGGER_TRAP_MAYBE();
276 /* Check if this is a watchpoint in kernel space */
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400277 if (kernel_mode_regs(fp))
Mike Frysinger6510a202009-06-07 15:07:25 -0400278 goto traps_done;
Bryan Wu1394f032007-05-06 14:50:22 -0700279 else
280 break;
281#ifdef CONFIG_BF535
282 /* 0x29 - Instruction fetch access error (535 only) */
283 case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
284 info.si_code = BUS_OPFETCH;
285 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400286 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800287 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700288 break;
289#else
290 /* 0x29 - Reserved, Caught by default */
291#endif
292 /* 0x2A - Instruction fetch misaligned, handled here */
293 case VEC_MISALI_I:
294 info.si_code = BUS_ADRALN;
295 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400296 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800297 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700298 break;
Robin Getzf26fbc42007-11-12 22:21:30 +0800299 /* 0x2B - Instruction CPLB protection violation, handled here */
Bryan Wu1394f032007-05-06 14:50:22 -0700300 case VEC_CPLB_I_VL:
301 info.si_code = ILL_CPLB_VI;
Robin Getzf26fbc42007-11-12 22:21:30 +0800302 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400303 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800304 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700305 break;
306 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
307 case VEC_CPLB_I_M:
308 info.si_code = ILL_CPLB_MISS;
309 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400310 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
Bryan Wu1394f032007-05-06 14:50:22 -0700311 break;
312 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
313 case VEC_CPLB_I_MHIT:
314 info.si_code = ILL_CPLB_MULHIT;
Bryan Wu1394f032007-05-06 14:50:22 -0700315 sig = SIGSEGV;
Mike Frysingerc6c6f752008-05-17 16:18:08 +0800316#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
Graf Yang8f658732008-11-18 17:48:22 +0800317 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400318 strerror = KERN_NOTICE "Jump to NULL address\n";
Mike Frysingerc6c6f752008-05-17 16:18:08 +0800319 else
Bryan Wu1394f032007-05-06 14:50:22 -0700320#endif
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400321 strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800322 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700323 break;
324 /* 0x2E - Illegal use of Supervisor Resource, handled here */
325 case VEC_ILL_RES:
326 info.si_code = ILL_PRVOPC;
327 sig = SIGILL;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400328 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800329 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700330 break;
331 /* 0x2F - Reserved, Caught by default */
332 /* 0x30 - Reserved, Caught by default */
333 /* 0x31 - Reserved, Caught by default */
334 /* 0x32 - Reserved, Caught by default */
335 /* 0x33 - Reserved, Caught by default */
336 /* 0x34 - Reserved, Caught by default */
337 /* 0x35 - Reserved, Caught by default */
338 /* 0x36 - Reserved, Caught by default */
339 /* 0x37 - Reserved, Caught by default */
340 /* 0x38 - Reserved, Caught by default */
341 /* 0x39 - Reserved, Caught by default */
342 /* 0x3A - Reserved, Caught by default */
343 /* 0x3B - Reserved, Caught by default */
344 /* 0x3C - Reserved, Caught by default */
345 /* 0x3D - Reserved, Caught by default */
346 /* 0x3E - Reserved, Caught by default */
347 /* 0x3F - Reserved, Caught by default */
Robin Getz13fe24f2008-01-27 15:38:56 +0800348 case VEC_HWERR:
349 info.si_code = BUS_ADRALN;
350 sig = SIGBUS;
351 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
352 /* System MMR Error */
353 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
354 info.si_code = BUS_ADRALN;
355 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400356 strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
Robin Getz13fe24f2008-01-27 15:38:56 +0800357 break;
358 /* External Memory Addressing Error */
359 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
Barry Songa00b4fe2009-11-27 09:18:21 +0000360 if (ANOMALY_05000310) {
361 static unsigned long anomaly_rets;
362
363 if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
364 (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
365 /*
366 * A false hardware error will happen while fetching at
367 * the L1 instruction SRAM boundary. Ignore it.
368 */
369 anomaly_rets = fp->rets;
370 goto traps_done;
371 } else if (fp->rets == anomaly_rets) {
372 /*
373 * While boundary code returns to a function, at the ret
374 * point, a new false hardware error might occur too based
375 * on tests. Ignore it too.
376 */
377 goto traps_done;
378 } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
379 (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
380 /*
381 * If boundary code calls a function, at the entry point,
382 * a new false hardware error maybe happen based on tests.
383 * Ignore it too.
384 */
385 goto traps_done;
386 } else
387 anomaly_rets = 0;
388 }
389
Robin Getz13fe24f2008-01-27 15:38:56 +0800390 info.si_code = BUS_ADRERR;
391 sig = SIGBUS;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400392 strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
Robin Getz13fe24f2008-01-27 15:38:56 +0800393 break;
394 /* Performance Monitor Overflow */
395 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400396 strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
Robin Getz13fe24f2008-01-27 15:38:56 +0800397 break;
398 /* RAISE 5 instruction */
399 case (SEQSTAT_HWERRCAUSE_RAISE_5):
400 printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
401 break;
402 default: /* Reserved */
403 printk(KERN_NOTICE HWC_default(KERN_NOTICE));
404 break;
405 }
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800406 CHK_DEBUGGER_TRAP_MAYBE();
Robin Getz13fe24f2008-01-27 15:38:56 +0800407 break;
Robin Getz5c64e0d2008-10-08 14:43:47 +0800408 /*
409 * We should be handling all known exception types above,
410 * if we get here we hit a reserved one, so panic
411 */
Bryan Wu1394f032007-05-06 14:50:22 -0700412 default:
Robin Getz5c64e0d2008-10-08 14:43:47 +0800413 info.si_code = ILL_ILLPARAOP;
414 sig = SIGILL;
Robin Getz9f06c382008-10-10 18:13:21 +0800415 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
Bryan Wu1394f032007-05-06 14:50:22 -0700416 (fp->seqstat & SEQSTAT_EXCAUSE));
Sonic Zhanga5ac0122008-10-13 14:07:19 +0800417 CHK_DEBUGGER_TRAP_MAYBE();
Bryan Wu1394f032007-05-06 14:50:22 -0700418 break;
419 }
420
Robin Getz226eb1e2007-10-29 17:59:07 +0800421 BUG_ON(sig == 0);
422
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400423 /* If the fault was caused by a kernel thread, or interrupt handler
424 * we will kernel panic, so the system reboots.
425 */
426 if (kernel_mode_regs(fp) || (current && !current->mm)) {
427 console_verbose();
428 oops_in_progress = 1;
Mike Frysinger82bd1d72009-06-07 17:08:28 -0400429 }
430
Robin Getz226eb1e2007-10-29 17:59:07 +0800431 if (sig != SIGTRAP) {
Mike Frysinger15627bd2009-06-23 11:21:34 +0000432 if (strerror)
433 verbose_printk(strerror);
434
Mike Frysinger49dce912007-11-21 16:46:49 +0800435 dump_bfin_process(fp);
Robin Getzb03b08b2007-12-23 22:57:01 +0800436 dump_bfin_mem(fp);
Mike Frysinger49dce912007-11-21 16:46:49 +0800437 show_regs(fp);
Robin Getz226eb1e2007-10-29 17:59:07 +0800438
439 /* Print out the trace buffer if it makes sense */
440#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
441 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
Robin Getz9f06c382008-10-10 18:13:21 +0800442 verbose_printk(KERN_NOTICE "No trace since you do not have "
Joe Perchesad361c92009-07-06 13:05:40 -0700443 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
Robin Getz226eb1e2007-10-29 17:59:07 +0800444 else
445#endif
446 dump_bfin_trace_buffer();
Robin Getzf09630b2008-07-26 19:45:46 +0800447
Robin Getz226eb1e2007-10-29 17:59:07 +0800448 if (oops_in_progress) {
Robin Getzf09630b2008-07-26 19:45:46 +0800449 /* Dump the current kernel stack */
Joe Perchesad361c92009-07-06 13:05:40 -0700450 verbose_printk(KERN_NOTICE "Kernel Stack\n");
Robin Getzf09630b2008-07-26 19:45:46 +0800451 show_stack(current, NULL);
Robin Getzaee3a292008-01-11 16:53:00 +0800452 print_modules();
Robin Getz226eb1e2007-10-29 17:59:07 +0800453#ifndef CONFIG_ACCESS_CHECK
Robin Getz9f06c382008-10-10 18:13:21 +0800454 verbose_printk(KERN_EMERG "Please turn on "
Robin Getz90c7f462007-11-18 00:35:33 +0800455 "CONFIG_ACCESS_CHECK\n");
Robin Getz226eb1e2007-10-29 17:59:07 +0800456#endif
Bryan Wu1394f032007-05-06 14:50:22 -0700457 panic("Kernel exception");
Robin Getzf09630b2008-07-26 19:45:46 +0800458 } else {
Robin Getz4ee1c452008-10-28 11:36:11 +0800459#ifdef CONFIG_DEBUG_VERBOSE
Robin Getz9f06c382008-10-10 18:13:21 +0800460 unsigned long *stack;
Robin Getzf09630b2008-07-26 19:45:46 +0800461 /* Dump the user space stack */
462 stack = (unsigned long *)rdusp();
Robin Getz9f06c382008-10-10 18:13:21 +0800463 verbose_printk(KERN_NOTICE "Userspace Stack\n");
Robin Getzf09630b2008-07-26 19:45:46 +0800464 show_stack(NULL, stack);
Robin Getz9f06c382008-10-10 18:13:21 +0800465#endif
Robin Getz226eb1e2007-10-29 17:59:07 +0800466 }
Bryan Wu1394f032007-05-06 14:50:22 -0700467 }
Robin Getzfb322912007-11-21 16:38:05 +0800468
Yi Li6a01f232009-01-07 23:14:39 +0800469#ifdef CONFIG_IPIPE
470 if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
471#endif
472 {
473 info.si_signo = sig;
474 info.si_errno = 0;
Barry Song5e8d3212010-01-19 11:01:08 +0000475 switch (trapnr) {
476 case VEC_CPLB_VL:
477 case VEC_MISALI_D:
478 case VEC_CPLB_M:
479 case VEC_CPLB_MHIT:
480 info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
481 break;
482 default:
483 info.si_addr = (void __user *)fp->pc;
484 break;
485 }
Yi Li6a01f232009-01-07 23:14:39 +0800486 force_sig_info(sig, &info, current);
487 }
Bryan Wu1394f032007-05-06 14:50:22 -0700488
Robin Getz0e4edcf2009-06-22 20:23:48 +0000489 if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
Robin Getzf574a762009-07-09 15:11:52 +0000490 (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
491 (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
Robin Getz0acad8d2009-05-11 18:55:16 +0000492 fp->pc = SAFE_USER_INSTRUCTION;
493
Mike Frysinger6510a202009-06-07 15:07:25 -0400494 traps_done:
Bryan Wu1394f032007-05-06 14:50:22 -0700495 trace_buffer_restore(j);
Bryan Wu1394f032007-05-06 14:50:22 -0700496}
497
Robin Getz2a12c462010-03-11 16:24:18 +0000498asmlinkage void double_fault_c(struct pt_regs *fp)
Robin Getzf09630b2008-07-26 19:45:46 +0800499{
Robin Getz518039b2007-07-25 11:03:28 +0800500#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
Robin Getz2a12c462010-03-11 16:24:18 +0000501 int j;
502 trace_buffer_save(j);
Robin Getz518039b2007-07-25 11:03:28 +0800503#endif
504
Robin Getz2a12c462010-03-11 16:24:18 +0000505 console_verbose();
506 oops_in_progress = 1;
Robin Getz9f06c382008-10-10 18:13:21 +0800507#ifdef CONFIG_DEBUG_VERBOSE
Robin Getz2a12c462010-03-11 16:24:18 +0000508 printk(KERN_EMERG "Double Fault\n");
509#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
510 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
511 unsigned int cpu = raw_smp_processor_id();
512 char buf[150];
513 decode_address(buf, cpu_pda[cpu].retx_doublefault);
514 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
515 (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
516 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
517 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
518 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
519 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
Robin Getz226eb1e2007-10-29 17:59:07 +0800520
Robin Getz2a12c462010-03-11 16:24:18 +0000521 decode_address(buf, fp->retx);
522 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
Mike Frysinger49dce912007-11-21 16:46:49 +0800523 } else
Robin Getz9f06c382008-10-10 18:13:21 +0800524#endif
Robin Getz2a12c462010-03-11 16:24:18 +0000525 {
526 dump_bfin_process(fp);
527 dump_bfin_mem(fp);
528 show_regs(fp);
529 dump_bfin_trace_buffer();
530 }
531#endif
532 panic("Double Fault - unrecoverable event");
533
Mike Frysinger49dce912007-11-21 16:46:49 +0800534}
535
Mike Frysinger1ffe6642007-08-05 17:14:04 +0800536
Bryan Wu1394f032007-05-06 14:50:22 -0700537void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
538{
539 switch (cplb_panic) {
540 case CPLB_NO_UNLOCKED:
541 printk(KERN_EMERG "All CPLBs are locked\n");
542 break;
543 case CPLB_PROT_VIOL:
544 return;
545 case CPLB_NO_ADDR_MATCH:
546 return;
547 case CPLB_UNKNOWN_ERR:
548 printk(KERN_EMERG "Unknown CPLB Exception\n");
549 break;
550 }
551
Robin Getz226eb1e2007-10-29 17:59:07 +0800552 oops_in_progress = 1;
553
Mike Frysinger49dce912007-11-21 16:46:49 +0800554 dump_bfin_process(fp);
Robin Getzb03b08b2007-12-23 22:57:01 +0800555 dump_bfin_mem(fp);
Mike Frysinger49dce912007-11-21 16:46:49 +0800556 show_regs(fp);
Bryan Wu1394f032007-05-06 14:50:22 -0700557 dump_stack();
Mike Frysingerd8804ad2009-04-29 06:26:46 +0000558 panic("Unrecoverable event");
Bryan Wu1394f032007-05-06 14:50:22 -0700559}
Robin Getz2a12c462010-03-11 16:24:18 +0000560
561#ifdef CONFIG_BUG
562int is_valid_bugaddr(unsigned long addr)
563{
Robin Getz9a95e2f2010-03-15 17:42:07 +0000564 unsigned int opcode;
Robin Getz2a12c462010-03-11 16:24:18 +0000565
566 if (!get_instruction(&opcode, (unsigned short *)addr))
567 return 0;
568
569 return opcode == BFIN_BUG_OPCODE;
570}
571#endif
Robin Getzd28cff42010-03-11 19:26:38 +0000572
573/* stub this out */
574#ifndef CONFIG_DEBUG_VERBOSE
575void show_regs(struct pt_regs *fp)
576{
577
578}
579#endif