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17ce452f JW |
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> | |
17ce452f JW |
18 | #include <linux/kgdb.h> |
19 | #include <linux/smp.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/ptrace.h> | |
ba797b28 | 22 | #include <linux/kdebug.h> |
17ce452f JW |
23 | #include <asm/current.h> |
24 | #include <asm/processor.h> | |
25 | #include <asm/machdep.h> | |
cad3c834 | 26 | #include <asm/debug.h> |
5f630401 | 27 | #include <linux/slab.h> |
17ce452f JW |
28 | |
29 | /* | |
30 | * This table contains the mapping between PowerPC hardware trap types, and | |
31 | * signals, which are primarily what GDB understands. GDB and the kernel | |
32 | * don't always agree on values, so we use constants taken from gdb-6.2. | |
33 | */ | |
34 | static struct hard_trap_info | |
35 | { | |
36 | unsigned int tt; /* Trap type code for powerpc */ | |
37 | unsigned char signo; /* Signal that we map this trap into */ | |
38 | } hard_trap_info[] = { | |
39 | { 0x0100, 0x02 /* SIGINT */ }, /* system reset */ | |
40 | { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */ | |
41 | { 0x0300, 0x0b /* SIGSEGV */ }, /* data access */ | |
42 | { 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */ | |
43 | { 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */ | |
44 | { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */ | |
45 | { 0x0700, 0x05 /* SIGTRAP */ }, /* program check */ | |
46 | { 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */ | |
47 | { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */ | |
48 | { 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */ | |
49 | #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) | |
50 | { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ | |
51 | #if defined(CONFIG_FSL_BOOKE) | |
52 | { 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */ | |
53 | { 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */ | |
54 | { 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */ | |
55 | { 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */ | |
56 | { 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */ | |
af901ca1 | 57 | { 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */ |
17ce452f JW |
58 | { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */ |
59 | { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */ | |
60 | { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */ | |
61 | #else /* ! CONFIG_FSL_BOOKE */ | |
62 | { 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */ | |
63 | { 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */ | |
64 | { 0x1020, 0x02 /* SIGINT */ }, /* watchdog */ | |
65 | { 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */ | |
66 | { 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */ | |
67 | #endif | |
68 | #else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */ | |
69 | { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ | |
70 | #if defined(CONFIG_8xx) | |
71 | { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ | |
72 | #else /* ! CONFIG_8xx */ | |
73 | { 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */ | |
74 | { 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */ | |
75 | { 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */ | |
76 | #if defined(CONFIG_PPC64) | |
77 | { 0x1200, 0x05 /* SIGILL */ }, /* system error */ | |
78 | { 0x1500, 0x04 /* SIGILL */ }, /* soft patch */ | |
79 | { 0x1600, 0x04 /* SIGILL */ }, /* maintenance */ | |
80 | { 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */ | |
81 | { 0x1800, 0x04 /* SIGILL */ }, /* thermal */ | |
82 | #else /* ! CONFIG_PPC64 */ | |
83 | { 0x1400, 0x02 /* SIGINT */ }, /* SMI */ | |
84 | { 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */ | |
85 | { 0x1700, 0x04 /* SIGILL */ }, /* TAU */ | |
86 | { 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */ | |
87 | #endif | |
88 | #endif | |
89 | #endif | |
90 | { 0x0000, 0x00 } /* Must be last */ | |
91 | }; | |
92 | ||
93 | static int computeSignal(unsigned int tt) | |
94 | { | |
95 | struct hard_trap_info *ht; | |
96 | ||
97 | for (ht = hard_trap_info; ht->tt && ht->signo; ht++) | |
98 | if (ht->tt == tt) | |
99 | return ht->signo; | |
100 | ||
101 | return SIGHUP; /* default for things we don't know about */ | |
102 | } | |
103 | ||
949616cf TC |
104 | /** |
105 | * | |
106 | * kgdb_skipexception - Bail out of KGDB when we've been triggered. | |
107 | * @exception: Exception vector number | |
108 | * @regs: Current &struct pt_regs. | |
109 | * | |
110 | * On some architectures we need to skip a breakpoint exception when | |
111 | * it occurs after a breakpoint has been removed. | |
112 | * | |
113 | */ | |
114 | int kgdb_skipexception(int exception, struct pt_regs *regs) | |
115 | { | |
116 | return kgdb_isremovedbreak(regs->nip); | |
117 | } | |
118 | ||
17ce452f JW |
119 | static int kgdb_call_nmi_hook(struct pt_regs *regs) |
120 | { | |
121 | kgdb_nmicallback(raw_smp_processor_id(), regs); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | #ifdef CONFIG_SMP | |
126 | void kgdb_roundup_cpus(unsigned long flags) | |
127 | { | |
e0476371 | 128 | smp_send_debugger_break(); |
17ce452f JW |
129 | } |
130 | #endif | |
131 | ||
132 | /* KGDB functions to use existing PowerPC64 hooks. */ | |
133 | static int kgdb_debugger(struct pt_regs *regs) | |
134 | { | |
ba797b28 JW |
135 | return !kgdb_handle_exception(1, computeSignal(TRAP(regs)), |
136 | DIE_OOPS, regs); | |
17ce452f JW |
137 | } |
138 | ||
139 | static int kgdb_handle_breakpoint(struct pt_regs *regs) | |
140 | { | |
141 | if (user_mode(regs)) | |
142 | return 0; | |
143 | ||
ba797b28 | 144 | if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) |
17ce452f JW |
145 | return 0; |
146 | ||
147 | if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr)) | |
3f0a55e3 | 148 | regs->nip += BREAK_INSTR_SIZE; |
17ce452f JW |
149 | |
150 | return 1; | |
151 | } | |
152 | ||
8258e268 | 153 | static DEFINE_PER_CPU(struct thread_info, kgdb_thread_info); |
17ce452f JW |
154 | static int kgdb_singlestep(struct pt_regs *regs) |
155 | { | |
156 | struct thread_info *thread_info, *exception_thread_info; | |
8258e268 | 157 | struct thread_info *backup_current_thread_info = |
69111bac | 158 | this_cpu_ptr(&kgdb_thread_info); |
17ce452f JW |
159 | |
160 | if (user_mode(regs)) | |
161 | return 0; | |
162 | ||
163 | /* | |
70f23fd6 | 164 | * On Book E and perhaps other processors, singlestep is handled on |
17ce452f JW |
165 | * the critical exception stack. This causes current_thread_info() |
166 | * to fail, since it it locates the thread_info by masking off | |
167 | * the low bits of the current stack pointer. We work around | |
168 | * this issue by copying the thread_info from the kernel stack | |
169 | * before calling kgdb_handle_exception, and copying it back | |
170 | * afterwards. On most processors the copy is avoided since | |
171 | * exception_thread_info == thread_info. | |
172 | */ | |
173 | thread_info = (struct thread_info *)(regs->gpr[1] & ~(THREAD_SIZE-1)); | |
174 | exception_thread_info = current_thread_info(); | |
175 | ||
5f630401 TC |
176 | if (thread_info != exception_thread_info) { |
177 | /* Save the original current_thread_info. */ | |
178 | memcpy(backup_current_thread_info, exception_thread_info, sizeof *thread_info); | |
17ce452f | 179 | memcpy(exception_thread_info, thread_info, sizeof *thread_info); |
5f630401 | 180 | } |
17ce452f JW |
181 | |
182 | kgdb_handle_exception(0, SIGTRAP, 0, regs); | |
183 | ||
184 | if (thread_info != exception_thread_info) | |
5f630401 TC |
185 | /* Restore current_thread_info lastly. */ |
186 | memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info); | |
17ce452f JW |
187 | |
188 | return 1; | |
189 | } | |
190 | ||
191 | static int kgdb_iabr_match(struct pt_regs *regs) | |
192 | { | |
193 | if (user_mode(regs)) | |
194 | return 0; | |
195 | ||
196 | if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) | |
197 | return 0; | |
198 | return 1; | |
199 | } | |
200 | ||
9422de3e | 201 | static int kgdb_break_match(struct pt_regs *regs) |
17ce452f JW |
202 | { |
203 | if (user_mode(regs)) | |
204 | return 0; | |
205 | ||
206 | if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) | |
207 | return 0; | |
208 | return 1; | |
209 | } | |
210 | ||
211 | #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0) | |
212 | ||
213 | #define PACK32(ptr, src) do { \ | |
214 | u32 *ptr32; \ | |
215 | ptr32 = (u32 *)ptr; \ | |
216 | *(ptr32++) = (src); \ | |
217 | ptr = (unsigned long *)ptr32; \ | |
218 | } while (0) | |
219 | ||
17ce452f JW |
220 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) |
221 | { | |
222 | struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + | |
223 | STACK_FRAME_OVERHEAD); | |
224 | unsigned long *ptr = gdb_regs; | |
225 | int reg; | |
226 | ||
227 | memset(gdb_regs, 0, NUMREGBYTES); | |
228 | ||
229 | /* Regs GPR0-2 */ | |
230 | for (reg = 0; reg < 3; reg++) | |
231 | PACK64(ptr, regs->gpr[reg]); | |
232 | ||
233 | /* Regs GPR3-13 are caller saved, not in regs->gpr[] */ | |
234 | ptr += 11; | |
235 | ||
236 | /* Regs GPR14-31 */ | |
237 | for (reg = 14; reg < 32; reg++) | |
238 | PACK64(ptr, regs->gpr[reg]); | |
239 | ||
240 | #ifdef CONFIG_FSL_BOOKE | |
241 | #ifdef CONFIG_SPE | |
242 | for (reg = 0; reg < 32; reg++) | |
243 | PACK64(ptr, p->thread.evr[reg]); | |
244 | #else | |
245 | ptr += 32; | |
246 | #endif | |
247 | #else | |
248 | /* fp registers not used by kernel, leave zero */ | |
249 | ptr += 32 * 8 / sizeof(long); | |
250 | #endif | |
251 | ||
252 | PACK64(ptr, regs->nip); | |
253 | PACK64(ptr, regs->msr); | |
254 | PACK32(ptr, regs->ccr); | |
255 | PACK64(ptr, regs->link); | |
256 | PACK64(ptr, regs->ctr); | |
257 | PACK32(ptr, regs->xer); | |
258 | ||
259 | BUG_ON((unsigned long)ptr > | |
260 | (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); | |
261 | } | |
262 | ||
ff10b88b DD |
263 | #define GDB_SIZEOF_REG sizeof(unsigned long) |
264 | #define GDB_SIZEOF_REG_U32 sizeof(u32) | |
17ce452f | 265 | |
ff10b88b DD |
266 | #ifdef CONFIG_FSL_BOOKE |
267 | #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long) | |
268 | #else | |
269 | #define GDB_SIZEOF_FLOAT_REG sizeof(u64) | |
270 | #endif | |
17ce452f | 271 | |
ff10b88b | 272 | struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = |
17ce452f | 273 | { |
ff10b88b DD |
274 | { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) }, |
275 | { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) }, | |
276 | { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) }, | |
277 | { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) }, | |
278 | { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) }, | |
279 | { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) }, | |
280 | { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) }, | |
281 | { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) }, | |
282 | { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) }, | |
283 | { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) }, | |
284 | { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) }, | |
285 | { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) }, | |
286 | { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) }, | |
287 | { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) }, | |
288 | { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) }, | |
289 | { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) }, | |
290 | { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) }, | |
291 | { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) }, | |
292 | { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) }, | |
293 | { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) }, | |
294 | { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) }, | |
295 | { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) }, | |
296 | { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) }, | |
297 | { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) }, | |
298 | { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) }, | |
299 | { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) }, | |
300 | { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) }, | |
301 | { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) }, | |
302 | { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) }, | |
303 | { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) }, | |
304 | { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) }, | |
305 | { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) }, | |
306 | ||
307 | { "f0", GDB_SIZEOF_FLOAT_REG, 0 }, | |
308 | { "f1", GDB_SIZEOF_FLOAT_REG, 1 }, | |
309 | { "f2", GDB_SIZEOF_FLOAT_REG, 2 }, | |
310 | { "f3", GDB_SIZEOF_FLOAT_REG, 3 }, | |
311 | { "f4", GDB_SIZEOF_FLOAT_REG, 4 }, | |
312 | { "f5", GDB_SIZEOF_FLOAT_REG, 5 }, | |
313 | { "f6", GDB_SIZEOF_FLOAT_REG, 6 }, | |
314 | { "f7", GDB_SIZEOF_FLOAT_REG, 7 }, | |
315 | { "f8", GDB_SIZEOF_FLOAT_REG, 8 }, | |
316 | { "f9", GDB_SIZEOF_FLOAT_REG, 9 }, | |
317 | { "f10", GDB_SIZEOF_FLOAT_REG, 10 }, | |
318 | { "f11", GDB_SIZEOF_FLOAT_REG, 11 }, | |
319 | { "f12", GDB_SIZEOF_FLOAT_REG, 12 }, | |
320 | { "f13", GDB_SIZEOF_FLOAT_REG, 13 }, | |
321 | { "f14", GDB_SIZEOF_FLOAT_REG, 14 }, | |
322 | { "f15", GDB_SIZEOF_FLOAT_REG, 15 }, | |
323 | { "f16", GDB_SIZEOF_FLOAT_REG, 16 }, | |
324 | { "f17", GDB_SIZEOF_FLOAT_REG, 17 }, | |
325 | { "f18", GDB_SIZEOF_FLOAT_REG, 18 }, | |
326 | { "f19", GDB_SIZEOF_FLOAT_REG, 19 }, | |
327 | { "f20", GDB_SIZEOF_FLOAT_REG, 20 }, | |
328 | { "f21", GDB_SIZEOF_FLOAT_REG, 21 }, | |
329 | { "f22", GDB_SIZEOF_FLOAT_REG, 22 }, | |
330 | { "f23", GDB_SIZEOF_FLOAT_REG, 23 }, | |
331 | { "f24", GDB_SIZEOF_FLOAT_REG, 24 }, | |
332 | { "f25", GDB_SIZEOF_FLOAT_REG, 25 }, | |
333 | { "f26", GDB_SIZEOF_FLOAT_REG, 26 }, | |
334 | { "f27", GDB_SIZEOF_FLOAT_REG, 27 }, | |
335 | { "f28", GDB_SIZEOF_FLOAT_REG, 28 }, | |
336 | { "f29", GDB_SIZEOF_FLOAT_REG, 29 }, | |
337 | { "f30", GDB_SIZEOF_FLOAT_REG, 30 }, | |
338 | { "f31", GDB_SIZEOF_FLOAT_REG, 31 }, | |
339 | ||
340 | { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) }, | |
341 | { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) }, | |
342 | { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) }, | |
343 | { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) }, | |
344 | { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) }, | |
345 | { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) }, | |
346 | }; | |
17ce452f | 347 | |
ff10b88b DD |
348 | char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) |
349 | { | |
350 | if (regno >= DBG_MAX_REG_NUM || regno < 0) | |
351 | return NULL; | |
352 | ||
353 | if (regno < 32 || regno >= 64) | |
354 | /* First 0 -> 31 gpr registers*/ | |
355 | /* pc, msr, ls... registers 64 -> 69 */ | |
356 | memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, | |
357 | dbg_reg_def[regno].size); | |
358 | ||
359 | if (regno >= 32 && regno < 64) { | |
360 | /* FP registers 32 -> 63 */ | |
361 | #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE) | |
362 | if (current) | |
e3839ed8 | 363 | memcpy(mem, ¤t->thread.evr[regno-32], |
ff10b88b | 364 | dbg_reg_def[regno].size); |
17ce452f | 365 | #else |
ff10b88b DD |
366 | /* fp registers not used by kernel, leave zero */ |
367 | memset(mem, 0, dbg_reg_def[regno].size); | |
17ce452f | 368 | #endif |
ff10b88b DD |
369 | } |
370 | ||
371 | return dbg_reg_def[regno].name; | |
372 | } | |
373 | ||
374 | int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) | |
375 | { | |
376 | if (regno >= DBG_MAX_REG_NUM || regno < 0) | |
377 | return -EINVAL; | |
378 | ||
379 | if (regno < 32 || regno >= 64) | |
380 | /* First 0 -> 31 gpr registers*/ | |
381 | /* pc, msr, ls... registers 64 -> 69 */ | |
382 | memcpy((void *)regs + dbg_reg_def[regno].offset, mem, | |
383 | dbg_reg_def[regno].size); | |
384 | ||
385 | if (regno >= 32 && regno < 64) { | |
386 | /* FP registers 32 -> 63 */ | |
387 | #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE) | |
e3839ed8 | 388 | memcpy(¤t->thread.evr[regno-32], mem, |
ff10b88b | 389 | dbg_reg_def[regno].size); |
17ce452f | 390 | #else |
ff10b88b DD |
391 | /* fp registers not used by kernel, leave zero */ |
392 | return 0; | |
17ce452f | 393 | #endif |
ff10b88b | 394 | } |
17ce452f | 395 | |
ff10b88b | 396 | return 0; |
17ce452f JW |
397 | } |
398 | ||
dcc78711 JW |
399 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) |
400 | { | |
401 | regs->nip = pc; | |
402 | } | |
403 | ||
17ce452f JW |
404 | /* |
405 | * This function does PowerPC specific procesing for interfacing to gdb. | |
406 | */ | |
407 | int kgdb_arch_handle_exception(int vector, int signo, int err_code, | |
408 | char *remcom_in_buffer, char *remcom_out_buffer, | |
409 | struct pt_regs *linux_regs) | |
410 | { | |
411 | char *ptr = &remcom_in_buffer[1]; | |
412 | unsigned long addr; | |
413 | ||
414 | switch (remcom_in_buffer[0]) { | |
415 | /* | |
416 | * sAA..AA Step one instruction from AA..AA | |
417 | * This will return an error to gdb .. | |
418 | */ | |
419 | case 's': | |
420 | case 'c': | |
421 | /* handle the optional parameter */ | |
422 | if (kgdb_hex2long(&ptr, &addr)) | |
423 | linux_regs->nip = addr; | |
424 | ||
425 | atomic_set(&kgdb_cpu_doing_single_step, -1); | |
426 | /* set the trace bit if we're stepping */ | |
427 | if (remcom_in_buffer[0] == 's') { | |
172ae2e7 | 428 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
17ce452f JW |
429 | mtspr(SPRN_DBCR0, |
430 | mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); | |
431 | linux_regs->msr |= MSR_DE; | |
432 | #else | |
433 | linux_regs->msr |= MSR_SE; | |
434 | #endif | |
d7161a65 JW |
435 | atomic_set(&kgdb_cpu_doing_single_step, |
436 | raw_smp_processor_id()); | |
17ce452f JW |
437 | } |
438 | return 0; | |
439 | } | |
440 | ||
441 | return -1; | |
442 | } | |
443 | ||
444 | /* | |
445 | * Global data | |
446 | */ | |
447 | struct kgdb_arch arch_kgdb_ops = { | |
94e3d923 BS |
448 | #ifdef __LITTLE_ENDIAN__ |
449 | .gdb_bpt_instr = {0x08, 0x10, 0x82, 0x7d}, | |
450 | #else | |
17ce452f | 451 | .gdb_bpt_instr = {0x7d, 0x82, 0x10, 0x08}, |
94e3d923 | 452 | #endif |
17ce452f JW |
453 | }; |
454 | ||
455 | static int kgdb_not_implemented(struct pt_regs *regs) | |
456 | { | |
457 | return 0; | |
458 | } | |
459 | ||
460 | static void *old__debugger_ipi; | |
461 | static void *old__debugger; | |
462 | static void *old__debugger_bpt; | |
463 | static void *old__debugger_sstep; | |
464 | static void *old__debugger_iabr_match; | |
9422de3e | 465 | static void *old__debugger_break_match; |
17ce452f JW |
466 | static void *old__debugger_fault_handler; |
467 | ||
468 | int kgdb_arch_init(void) | |
469 | { | |
470 | old__debugger_ipi = __debugger_ipi; | |
471 | old__debugger = __debugger; | |
472 | old__debugger_bpt = __debugger_bpt; | |
473 | old__debugger_sstep = __debugger_sstep; | |
474 | old__debugger_iabr_match = __debugger_iabr_match; | |
9422de3e | 475 | old__debugger_break_match = __debugger_break_match; |
17ce452f JW |
476 | old__debugger_fault_handler = __debugger_fault_handler; |
477 | ||
478 | __debugger_ipi = kgdb_call_nmi_hook; | |
479 | __debugger = kgdb_debugger; | |
480 | __debugger_bpt = kgdb_handle_breakpoint; | |
481 | __debugger_sstep = kgdb_singlestep; | |
482 | __debugger_iabr_match = kgdb_iabr_match; | |
9422de3e | 483 | __debugger_break_match = kgdb_break_match; |
17ce452f JW |
484 | __debugger_fault_handler = kgdb_not_implemented; |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | void kgdb_arch_exit(void) | |
490 | { | |
491 | __debugger_ipi = old__debugger_ipi; | |
492 | __debugger = old__debugger; | |
493 | __debugger_bpt = old__debugger_bpt; | |
494 | __debugger_sstep = old__debugger_sstep; | |
495 | __debugger_iabr_match = old__debugger_iabr_match; | |
fa592464 | 496 | __debugger_break_match = old__debugger_break_match; |
17ce452f JW |
497 | __debugger_fault_handler = old__debugger_fault_handler; |
498 | } |