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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / arch / powerpc / kernel / kgdb.c
blobb7696afbbadf85fdc3542381b60305ed97a24a12
1 /*
2 * PowerPC backend to the KGDB stub.
3 *
4 * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
5 * Copyright (C) 2003 Timesys Corporation.
6 * Copyright (C) 2004-2006 MontaVista Software, Inc.
7 * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
8 * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
9 * Sergei Shtylyov <sshtylyov@ru.mvista.com>
10 * Copyright (C) 2007-2008 Wind River Systems, Inc.
11 *
12 * This file is licensed under the terms of the GNU General Public License
13 * version 2. This program as licensed "as is" without any warranty of any
14 * kind, whether express or implied.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/init.h>
19 #include <linux/kgdb.h>
20 #include <linux/smp.h>
21 #include <linux/signal.h>
22 #include <linux/ptrace.h>
23 #include <linux/kdebug.h>
24 #include <asm/current.h>
25 #include <asm/processor.h>
26 #include <asm/machdep.h>
27
28 /*
29 * This table contains the mapping between PowerPC hardware trap types, and
30 * signals, which are primarily what GDB understands. GDB and the kernel
31 * don't always agree on values, so we use constants taken from gdb-6.2.
32 */
33 static struct hard_trap_info
34 {
35 unsigned int tt; /* Trap type code for powerpc */
36 unsigned char signo; /* Signal that we map this trap into */
37 } hard_trap_info[] = {
38 { 0x0100, 0x02 /* SIGINT */ }, /* system reset */
39 { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */
40 { 0x0300, 0x0b /* SIGSEGV */ }, /* data access */
41 { 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */
42 { 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */
43 { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */
44 { 0x0700, 0x05 /* SIGTRAP */ }, /* program check */
45 { 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */
46 { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */
47 { 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */
48 #if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
49 { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */
50 #if defined(CONFIG_FSL_BOOKE)
51 { 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */
52 { 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */
53 { 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */
54 { 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */
55 { 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */
56 { 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */
57 { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */
58 { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */
59 { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */
60 #else /* ! CONFIG_FSL_BOOKE */
61 { 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */
62 { 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */
63 { 0x1020, 0x02 /* SIGINT */ }, /* watchdog */
64 { 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */
65 { 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */
66 #endif
67 #else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */
68 { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */
69 #if defined(CONFIG_8xx)
70 { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */
71 #else /* ! CONFIG_8xx */
72 { 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */
73 { 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */
74 { 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */
75 #if defined(CONFIG_PPC64)
76 { 0x1200, 0x05 /* SIGILL */ }, /* system error */
77 { 0x1500, 0x04 /* SIGILL */ }, /* soft patch */
78 { 0x1600, 0x04 /* SIGILL */ }, /* maintenance */
79 { 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */
80 { 0x1800, 0x04 /* SIGILL */ }, /* thermal */
81 #else /* ! CONFIG_PPC64 */
82 { 0x1400, 0x02 /* SIGINT */ }, /* SMI */
83 { 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */
84 { 0x1700, 0x04 /* SIGILL */ }, /* TAU */
85 { 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */
86 #endif
87 #endif
88 #endif
89 { 0x0000, 0x00 } /* Must be last */
90 };
91
92 static int computeSignal(unsigned int tt)
93 {
94 struct hard_trap_info *ht;
95
96 for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
97 if (ht->tt == tt)
98 return ht->signo;
99
100 return SIGHUP; /* default for things we don't know about */
101 }
102
103 static int kgdb_call_nmi_hook(struct pt_regs *regs)
104 {
105 kgdb_nmicallback(raw_smp_processor_id(), regs);
106 return 0;
107 }
108
109 #ifdef CONFIG_SMP
110 void kgdb_roundup_cpus(unsigned long flags)
111 {
112 smp_send_debugger_break(MSG_ALL_BUT_SELF);
113 }
114 #endif
115
116 /* KGDB functions to use existing PowerPC64 hooks. */
117 static int kgdb_debugger(struct pt_regs *regs)
118 {
119 return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
120 DIE_OOPS, regs);
121 }
122
123 static int kgdb_handle_breakpoint(struct pt_regs *regs)
124 {
125 if (user_mode(regs))
126 return 0;
127
128 if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
129 return 0;
130
131 if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
132 regs->nip += BREAK_INSTR_SIZE;
133
134 return 1;
135 }
136
137 static int kgdb_singlestep(struct pt_regs *regs)
138 {
139 struct thread_info *thread_info, *exception_thread_info;
140
141 if (user_mode(regs))
142 return 0;
143
144 thread_info = (struct thread_info *)(regs->gpr[1] & ~(THREAD_SIZE-1));
145 exception_thread_info = current_thread_info();
146
147 if (thread_info != exception_thread_info)
148 memcpy(exception_thread_info, thread_info, sizeof *thread_info);
149
150 kgdb_handle_exception(0, SIGTRAP, 0, regs);
151
152 if (thread_info != exception_thread_info)
153 memcpy(thread_info, exception_thread_info, sizeof *thread_info);
154
155 return 1;
156 }
157
158 static int kgdb_iabr_match(struct pt_regs *regs)
159 {
160 if (user_mode(regs))
161 return 0;
162
163 if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
164 return 0;
165 return 1;
166 }
167
168 static int kgdb_dabr_match(struct pt_regs *regs)
169 {
170 if (user_mode(regs))
171 return 0;
172
173 if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
174 return 0;
175 return 1;
176 }
177
178 #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)
179
180 #define PACK32(ptr, src) do { \
181 u32 *ptr32; \
182 ptr32 = (u32 *)ptr; \
183 *(ptr32++) = (src); \
184 ptr = (unsigned long *)ptr32; \
185 } while (0)
186
187
188 void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
189 {
190 unsigned long *ptr = gdb_regs;
191 int reg;
192
193 memset(gdb_regs, 0, NUMREGBYTES);
194
195 for (reg = 0; reg < 32; reg++)
196 PACK64(ptr, regs->gpr[reg]);
197
198 #ifdef CONFIG_FSL_BOOKE
199 #ifdef CONFIG_SPE
200 for (reg = 0; reg < 32; reg++)
201 PACK64(ptr, current->thread.evr[reg]);
202 #else
203 ptr += 32;
204 #endif
205 #else
206 /* fp registers not used by kernel, leave zero */
207 ptr += 32 * 8 / sizeof(long);
208 #endif
209
210 PACK64(ptr, regs->nip);
211 PACK64(ptr, regs->msr);
212 PACK32(ptr, regs->ccr);
213 PACK64(ptr, regs->link);
214 PACK64(ptr, regs->ctr);
215 PACK32(ptr, regs->xer);
216
217 BUG_ON((unsigned long)ptr >
218 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
219 }
220
221 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
222 {
223 struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
224 STACK_FRAME_OVERHEAD);
225 unsigned long *ptr = gdb_regs;
226 int reg;
227
228 memset(gdb_regs, 0, NUMREGBYTES);
229
230 /* Regs GPR0-2 */
231 for (reg = 0; reg < 3; reg++)
232 PACK64(ptr, regs->gpr[reg]);
233
234 /* Regs GPR3-13 are caller saved, not in regs->gpr[] */
235 ptr += 11;
236
237 /* Regs GPR14-31 */
238 for (reg = 14; reg < 32; reg++)
239 PACK64(ptr, regs->gpr[reg]);
240
241 #ifdef CONFIG_FSL_BOOKE
242 #ifdef CONFIG_SPE
243 for (reg = 0; reg < 32; reg++)
244 PACK64(ptr, p->thread.evr[reg]);
245 #else
246 ptr += 32;
247 #endif
248 #else
249 /* fp registers not used by kernel, leave zero */
250 ptr += 32 * 8 / sizeof(long);
251 #endif
252
253 PACK64(ptr, regs->nip);
254 PACK64(ptr, regs->msr);
255 PACK32(ptr, regs->ccr);
256 PACK64(ptr, regs->link);
257 PACK64(ptr, regs->ctr);
258 PACK32(ptr, regs->xer);
259
260 BUG_ON((unsigned long)ptr >
261 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
262 }
263
264 #define UNPACK64(dest, ptr) do { dest = *(ptr++); } while (0)
265
266 #define UNPACK32(dest, ptr) do { \
267 u32 *ptr32; \
268 ptr32 = (u32 *)ptr; \
269 dest = *(ptr32++); \
270 ptr = (unsigned long *)ptr32; \
271 } while (0)
272
273 void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
274 {
275 unsigned long *ptr = gdb_regs;
276 int reg;
277
278 for (reg = 0; reg < 32; reg++)
279 UNPACK64(regs->gpr[reg], ptr);
280
281 #ifdef CONFIG_FSL_BOOKE
282 #ifdef CONFIG_SPE
283 for (reg = 0; reg < 32; reg++)
284 UNPACK64(current->thread.evr[reg], ptr);
285 #else
286 ptr += 32;
287 #endif
288 #else
289 /* fp registers not used by kernel, leave zero */
290 ptr += 32 * 8 / sizeof(int);
291 #endif
292
293 UNPACK64(regs->nip, ptr);
294 UNPACK64(regs->msr, ptr);
295 UNPACK32(regs->ccr, ptr);
296 UNPACK64(regs->link, ptr);
297 UNPACK64(regs->ctr, ptr);
298 UNPACK32(regs->xer, ptr);
299
300 BUG_ON((unsigned long)ptr >
301 (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
302 }
303
304 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
305 {
306 regs->nip = pc;
307 }
308
309 /*
310 * This function does PowerPC specific procesing for interfacing to gdb.
311 */
312 int kgdb_arch_handle_exception(int vector, int signo, int err_code,
313 char *remcom_in_buffer, char *remcom_out_buffer,
314 struct pt_regs *linux_regs)
315 {
316 char *ptr = &remcom_in_buffer[1];
317 unsigned long addr;
318
319 switch (remcom_in_buffer[0]) {
320 /*
321 * sAA..AA Step one instruction from AA..AA
322 * This will return an error to gdb ..
323 */
324 case 's':
325 case 'c':
326 /* handle the optional parameter */
327 if (kgdb_hex2long(&ptr, &addr))
328 linux_regs->nip = addr;
329
330 atomic_set(&kgdb_cpu_doing_single_step, -1);
331 /* set the trace bit if we're stepping */
332 if (remcom_in_buffer[0] == 's') {
333 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
334 mtspr(SPRN_DBCR0,
335 mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
336 linux_regs->msr |= MSR_DE;
337 #else
338 linux_regs->msr |= MSR_SE;
339 #endif
340 kgdb_single_step = 1;
341 atomic_set(&kgdb_cpu_doing_single_step,
342 raw_smp_processor_id());
343 }
344 return 0;
345 }
346
347 return -1;
348 }
349
350 /*
351 * Global data
352 */
353 struct kgdb_arch arch_kgdb_ops = {
354 .gdb_bpt_instr = {0x7d, 0x82, 0x10, 0x08},
355 };
356
357 static int kgdb_not_implemented(struct pt_regs *regs)
358 {
359 return 0;
360 }
361
362 static void *old__debugger_ipi;
363 static void *old__debugger;
364 static void *old__debugger_bpt;
365 static void *old__debugger_sstep;
366 static void *old__debugger_iabr_match;
367 static void *old__debugger_dabr_match;
368 static void *old__debugger_fault_handler;
369
370 int kgdb_arch_init(void)
371 {
372 old__debugger_ipi = __debugger_ipi;
373 old__debugger = __debugger;
374 old__debugger_bpt = __debugger_bpt;
375 old__debugger_sstep = __debugger_sstep;
376 old__debugger_iabr_match = __debugger_iabr_match;
377 old__debugger_dabr_match = __debugger_dabr_match;
378 old__debugger_fault_handler = __debugger_fault_handler;
379
380 __debugger_ipi = kgdb_call_nmi_hook;
381 __debugger = kgdb_debugger;
382 __debugger_bpt = kgdb_handle_breakpoint;
383 __debugger_sstep = kgdb_singlestep;
384 __debugger_iabr_match = kgdb_iabr_match;
385 __debugger_dabr_match = kgdb_dabr_match;
386 __debugger_fault_handler = kgdb_not_implemented;
387
388 return 0;
389 }
390
391 void kgdb_arch_exit(void)
392 {
393 __debugger_ipi = old__debugger_ipi;
394 __debugger = old__debugger;
395 __debugger_bpt = old__debugger_bpt;
396 __debugger_sstep = old__debugger_sstep;
397 __debugger_iabr_match = old__debugger_iabr_match;
398 __debugger_dabr_match = old__debugger_dabr_match;
399 __debugger_fault_handler = old__debugger_fault_handler;
400 }
Tomato firmware and modifications.