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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> |
fb978ca2 | 27 | #include <asm/code-patching.h> |
5f630401 | 28 | #include <linux/slab.h> |
75346251 | 29 | #include <asm/inst.h> |
17ce452f JW |
30 | |
31 | /* | |
32 | * This table contains the mapping between PowerPC hardware trap types, and | |
33 | * signals, which are primarily what GDB understands. GDB and the kernel | |
34 | * don't always agree on values, so we use constants taken from gdb-6.2. | |
35 | */ | |
36 | static struct hard_trap_info | |
37 | { | |
38 | unsigned int tt; /* Trap type code for powerpc */ | |
39 | unsigned char signo; /* Signal that we map this trap into */ | |
40 | } hard_trap_info[] = { | |
41 | { 0x0100, 0x02 /* SIGINT */ }, /* system reset */ | |
42 | { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */ | |
43 | { 0x0300, 0x0b /* SIGSEGV */ }, /* data access */ | |
44 | { 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */ | |
45 | { 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */ | |
46 | { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */ | |
47 | { 0x0700, 0x05 /* SIGTRAP */ }, /* program check */ | |
48 | { 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */ | |
49 | { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */ | |
50 | { 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */ | |
51 | #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) | |
52 | { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ | |
53 | #if defined(CONFIG_FSL_BOOKE) | |
54 | { 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */ | |
55 | { 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */ | |
56 | { 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */ | |
57 | { 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */ | |
58 | { 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */ | |
af901ca1 | 59 | { 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */ |
17ce452f JW |
60 | { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */ |
61 | { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */ | |
62 | { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */ | |
63 | #else /* ! CONFIG_FSL_BOOKE */ | |
64 | { 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */ | |
65 | { 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */ | |
66 | { 0x1020, 0x02 /* SIGINT */ }, /* watchdog */ | |
67 | { 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */ | |
68 | { 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */ | |
69 | #endif | |
70 | #else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */ | |
71 | { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ | |
968159c0 | 72 | #if defined(CONFIG_PPC_8xx) |
17ce452f | 73 | { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ |
968159c0 | 74 | #else /* ! CONFIG_PPC_8xx */ |
17ce452f JW |
75 | { 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */ |
76 | { 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */ | |
77 | { 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */ | |
78 | #if defined(CONFIG_PPC64) | |
79 | { 0x1200, 0x05 /* SIGILL */ }, /* system error */ | |
80 | { 0x1500, 0x04 /* SIGILL */ }, /* soft patch */ | |
81 | { 0x1600, 0x04 /* SIGILL */ }, /* maintenance */ | |
82 | { 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */ | |
83 | { 0x1800, 0x04 /* SIGILL */ }, /* thermal */ | |
84 | #else /* ! CONFIG_PPC64 */ | |
85 | { 0x1400, 0x02 /* SIGINT */ }, /* SMI */ | |
86 | { 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */ | |
87 | { 0x1700, 0x04 /* SIGILL */ }, /* TAU */ | |
88 | { 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */ | |
89 | #endif | |
90 | #endif | |
91 | #endif | |
92 | { 0x0000, 0x00 } /* Must be last */ | |
93 | }; | |
94 | ||
95 | static int computeSignal(unsigned int tt) | |
96 | { | |
97 | struct hard_trap_info *ht; | |
98 | ||
99 | for (ht = hard_trap_info; ht->tt && ht->signo; ht++) | |
100 | if (ht->tt == tt) | |
101 | return ht->signo; | |
102 | ||
103 | return SIGHUP; /* default for things we don't know about */ | |
104 | } | |
105 | ||
949616cf TC |
106 | /** |
107 | * | |
108 | * kgdb_skipexception - Bail out of KGDB when we've been triggered. | |
109 | * @exception: Exception vector number | |
110 | * @regs: Current &struct pt_regs. | |
111 | * | |
112 | * On some architectures we need to skip a breakpoint exception when | |
113 | * it occurs after a breakpoint has been removed. | |
114 | * | |
115 | */ | |
116 | int kgdb_skipexception(int exception, struct pt_regs *regs) | |
117 | { | |
118 | return kgdb_isremovedbreak(regs->nip); | |
119 | } | |
120 | ||
3cd99ac3 | 121 | static int kgdb_debugger_ipi(struct pt_regs *regs) |
17ce452f JW |
122 | { |
123 | kgdb_nmicallback(raw_smp_processor_id(), regs); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | #ifdef CONFIG_SMP | |
9ef7fa50 | 128 | void kgdb_roundup_cpus(void) |
17ce452f | 129 | { |
e0476371 | 130 | smp_send_debugger_break(); |
17ce452f JW |
131 | } |
132 | #endif | |
133 | ||
134 | /* KGDB functions to use existing PowerPC64 hooks. */ | |
135 | static int kgdb_debugger(struct pt_regs *regs) | |
136 | { | |
ba797b28 JW |
137 | return !kgdb_handle_exception(1, computeSignal(TRAP(regs)), |
138 | DIE_OOPS, regs); | |
17ce452f JW |
139 | } |
140 | ||
141 | static int kgdb_handle_breakpoint(struct pt_regs *regs) | |
142 | { | |
143 | if (user_mode(regs)) | |
144 | return 0; | |
145 | ||
ba797b28 | 146 | if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) |
17ce452f JW |
147 | return 0; |
148 | ||
fb978ca2 | 149 | if (*(u32 *)regs->nip == BREAK_INSTR) |
3f0a55e3 | 150 | regs->nip += BREAK_INSTR_SIZE; |
17ce452f JW |
151 | |
152 | return 1; | |
153 | } | |
154 | ||
155 | static int kgdb_singlestep(struct pt_regs *regs) | |
156 | { | |
17ce452f JW |
157 | if (user_mode(regs)) |
158 | return 0; | |
159 | ||
17ce452f JW |
160 | kgdb_handle_exception(0, SIGTRAP, 0, regs); |
161 | ||
17ce452f JW |
162 | return 1; |
163 | } | |
164 | ||
165 | static int kgdb_iabr_match(struct pt_regs *regs) | |
166 | { | |
167 | if (user_mode(regs)) | |
168 | return 0; | |
169 | ||
170 | if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) | |
171 | return 0; | |
172 | return 1; | |
173 | } | |
174 | ||
9422de3e | 175 | static int kgdb_break_match(struct pt_regs *regs) |
17ce452f JW |
176 | { |
177 | if (user_mode(regs)) | |
178 | return 0; | |
179 | ||
180 | if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) | |
181 | return 0; | |
182 | return 1; | |
183 | } | |
184 | ||
185 | #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0) | |
186 | ||
187 | #define PACK32(ptr, src) do { \ | |
188 | u32 *ptr32; \ | |
189 | ptr32 = (u32 *)ptr; \ | |
190 | *(ptr32++) = (src); \ | |
191 | ptr = (unsigned long *)ptr32; \ | |
192 | } while (0) | |
193 | ||
17ce452f JW |
194 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) |
195 | { | |
196 | struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + | |
197 | STACK_FRAME_OVERHEAD); | |
198 | unsigned long *ptr = gdb_regs; | |
199 | int reg; | |
200 | ||
201 | memset(gdb_regs, 0, NUMREGBYTES); | |
202 | ||
203 | /* Regs GPR0-2 */ | |
204 | for (reg = 0; reg < 3; reg++) | |
205 | PACK64(ptr, regs->gpr[reg]); | |
206 | ||
207 | /* Regs GPR3-13 are caller saved, not in regs->gpr[] */ | |
208 | ptr += 11; | |
209 | ||
210 | /* Regs GPR14-31 */ | |
211 | for (reg = 14; reg < 32; reg++) | |
212 | PACK64(ptr, regs->gpr[reg]); | |
213 | ||
214 | #ifdef CONFIG_FSL_BOOKE | |
215 | #ifdef CONFIG_SPE | |
216 | for (reg = 0; reg < 32; reg++) | |
217 | PACK64(ptr, p->thread.evr[reg]); | |
218 | #else | |
219 | ptr += 32; | |
220 | #endif | |
221 | #else | |
222 | /* fp registers not used by kernel, leave zero */ | |
223 | ptr += 32 * 8 / sizeof(long); | |
224 | #endif | |
225 | ||
226 | PACK64(ptr, regs->nip); | |
227 | PACK64(ptr, regs->msr); | |
228 | PACK32(ptr, regs->ccr); | |
229 | PACK64(ptr, regs->link); | |
230 | PACK64(ptr, regs->ctr); | |
231 | PACK32(ptr, regs->xer); | |
232 | ||
233 | BUG_ON((unsigned long)ptr > | |
234 | (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); | |
235 | } | |
236 | ||
ff10b88b DD |
237 | #define GDB_SIZEOF_REG sizeof(unsigned long) |
238 | #define GDB_SIZEOF_REG_U32 sizeof(u32) | |
17ce452f | 239 | |
ff10b88b DD |
240 | #ifdef CONFIG_FSL_BOOKE |
241 | #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long) | |
242 | #else | |
243 | #define GDB_SIZEOF_FLOAT_REG sizeof(u64) | |
244 | #endif | |
17ce452f | 245 | |
ff10b88b | 246 | struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = |
17ce452f | 247 | { |
ff10b88b DD |
248 | { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) }, |
249 | { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) }, | |
250 | { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) }, | |
251 | { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) }, | |
252 | { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) }, | |
253 | { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) }, | |
254 | { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) }, | |
255 | { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) }, | |
256 | { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) }, | |
257 | { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) }, | |
258 | { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) }, | |
259 | { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) }, | |
260 | { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) }, | |
261 | { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) }, | |
262 | { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) }, | |
263 | { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) }, | |
264 | { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) }, | |
265 | { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) }, | |
266 | { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) }, | |
267 | { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) }, | |
268 | { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) }, | |
269 | { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) }, | |
270 | { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) }, | |
271 | { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) }, | |
272 | { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) }, | |
273 | { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) }, | |
274 | { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) }, | |
275 | { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) }, | |
276 | { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) }, | |
277 | { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) }, | |
278 | { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) }, | |
279 | { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) }, | |
280 | ||
281 | { "f0", GDB_SIZEOF_FLOAT_REG, 0 }, | |
282 | { "f1", GDB_SIZEOF_FLOAT_REG, 1 }, | |
283 | { "f2", GDB_SIZEOF_FLOAT_REG, 2 }, | |
284 | { "f3", GDB_SIZEOF_FLOAT_REG, 3 }, | |
285 | { "f4", GDB_SIZEOF_FLOAT_REG, 4 }, | |
286 | { "f5", GDB_SIZEOF_FLOAT_REG, 5 }, | |
287 | { "f6", GDB_SIZEOF_FLOAT_REG, 6 }, | |
288 | { "f7", GDB_SIZEOF_FLOAT_REG, 7 }, | |
289 | { "f8", GDB_SIZEOF_FLOAT_REG, 8 }, | |
290 | { "f9", GDB_SIZEOF_FLOAT_REG, 9 }, | |
291 | { "f10", GDB_SIZEOF_FLOAT_REG, 10 }, | |
292 | { "f11", GDB_SIZEOF_FLOAT_REG, 11 }, | |
293 | { "f12", GDB_SIZEOF_FLOAT_REG, 12 }, | |
294 | { "f13", GDB_SIZEOF_FLOAT_REG, 13 }, | |
295 | { "f14", GDB_SIZEOF_FLOAT_REG, 14 }, | |
296 | { "f15", GDB_SIZEOF_FLOAT_REG, 15 }, | |
297 | { "f16", GDB_SIZEOF_FLOAT_REG, 16 }, | |
298 | { "f17", GDB_SIZEOF_FLOAT_REG, 17 }, | |
299 | { "f18", GDB_SIZEOF_FLOAT_REG, 18 }, | |
300 | { "f19", GDB_SIZEOF_FLOAT_REG, 19 }, | |
301 | { "f20", GDB_SIZEOF_FLOAT_REG, 20 }, | |
302 | { "f21", GDB_SIZEOF_FLOAT_REG, 21 }, | |
303 | { "f22", GDB_SIZEOF_FLOAT_REG, 22 }, | |
304 | { "f23", GDB_SIZEOF_FLOAT_REG, 23 }, | |
305 | { "f24", GDB_SIZEOF_FLOAT_REG, 24 }, | |
306 | { "f25", GDB_SIZEOF_FLOAT_REG, 25 }, | |
307 | { "f26", GDB_SIZEOF_FLOAT_REG, 26 }, | |
308 | { "f27", GDB_SIZEOF_FLOAT_REG, 27 }, | |
309 | { "f28", GDB_SIZEOF_FLOAT_REG, 28 }, | |
310 | { "f29", GDB_SIZEOF_FLOAT_REG, 29 }, | |
311 | { "f30", GDB_SIZEOF_FLOAT_REG, 30 }, | |
312 | { "f31", GDB_SIZEOF_FLOAT_REG, 31 }, | |
313 | ||
314 | { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) }, | |
315 | { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) }, | |
316 | { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) }, | |
317 | { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) }, | |
318 | { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) }, | |
319 | { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) }, | |
320 | }; | |
17ce452f | 321 | |
ff10b88b DD |
322 | char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) |
323 | { | |
324 | if (regno >= DBG_MAX_REG_NUM || regno < 0) | |
325 | return NULL; | |
326 | ||
327 | if (regno < 32 || regno >= 64) | |
328 | /* First 0 -> 31 gpr registers*/ | |
329 | /* pc, msr, ls... registers 64 -> 69 */ | |
330 | memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, | |
331 | dbg_reg_def[regno].size); | |
332 | ||
333 | if (regno >= 32 && regno < 64) { | |
334 | /* FP registers 32 -> 63 */ | |
335 | #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE) | |
336 | if (current) | |
e3839ed8 | 337 | memcpy(mem, ¤t->thread.evr[regno-32], |
ff10b88b | 338 | dbg_reg_def[regno].size); |
17ce452f | 339 | #else |
ff10b88b DD |
340 | /* fp registers not used by kernel, leave zero */ |
341 | memset(mem, 0, dbg_reg_def[regno].size); | |
17ce452f | 342 | #endif |
ff10b88b DD |
343 | } |
344 | ||
345 | return dbg_reg_def[regno].name; | |
346 | } | |
347 | ||
348 | int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) | |
349 | { | |
350 | if (regno >= DBG_MAX_REG_NUM || regno < 0) | |
351 | return -EINVAL; | |
352 | ||
353 | if (regno < 32 || regno >= 64) | |
354 | /* First 0 -> 31 gpr registers*/ | |
355 | /* pc, msr, ls... registers 64 -> 69 */ | |
356 | memcpy((void *)regs + dbg_reg_def[regno].offset, mem, | |
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) | |
e3839ed8 | 362 | memcpy(¤t->thread.evr[regno-32], mem, |
ff10b88b | 363 | dbg_reg_def[regno].size); |
17ce452f | 364 | #else |
ff10b88b DD |
365 | /* fp registers not used by kernel, leave zero */ |
366 | return 0; | |
17ce452f | 367 | #endif |
ff10b88b | 368 | } |
17ce452f | 369 | |
ff10b88b | 370 | return 0; |
17ce452f JW |
371 | } |
372 | ||
dcc78711 JW |
373 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) |
374 | { | |
375 | regs->nip = pc; | |
376 | } | |
377 | ||
17ce452f JW |
378 | /* |
379 | * This function does PowerPC specific procesing for interfacing to gdb. | |
380 | */ | |
381 | int kgdb_arch_handle_exception(int vector, int signo, int err_code, | |
382 | char *remcom_in_buffer, char *remcom_out_buffer, | |
383 | struct pt_regs *linux_regs) | |
384 | { | |
385 | char *ptr = &remcom_in_buffer[1]; | |
386 | unsigned long addr; | |
387 | ||
388 | switch (remcom_in_buffer[0]) { | |
389 | /* | |
390 | * sAA..AA Step one instruction from AA..AA | |
391 | * This will return an error to gdb .. | |
392 | */ | |
393 | case 's': | |
394 | case 'c': | |
395 | /* handle the optional parameter */ | |
396 | if (kgdb_hex2long(&ptr, &addr)) | |
397 | linux_regs->nip = addr; | |
398 | ||
399 | atomic_set(&kgdb_cpu_doing_single_step, -1); | |
400 | /* set the trace bit if we're stepping */ | |
401 | if (remcom_in_buffer[0] == 's') { | |
172ae2e7 | 402 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
17ce452f JW |
403 | mtspr(SPRN_DBCR0, |
404 | mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); | |
405 | linux_regs->msr |= MSR_DE; | |
406 | #else | |
407 | linux_regs->msr |= MSR_SE; | |
408 | #endif | |
d7161a65 JW |
409 | atomic_set(&kgdb_cpu_doing_single_step, |
410 | raw_smp_processor_id()); | |
17ce452f JW |
411 | } |
412 | return 0; | |
413 | } | |
414 | ||
415 | return -1; | |
416 | } | |
417 | ||
fb978ca2 CL |
418 | int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) |
419 | { | |
420 | int err; | |
421 | unsigned int instr; | |
422 | unsigned int *addr = (unsigned int *)bpt->bpt_addr; | |
423 | ||
424 | err = probe_kernel_address(addr, instr); | |
425 | if (err) | |
426 | return err; | |
427 | ||
75346251 | 428 | err = patch_instruction(addr, ppc_inst(BREAK_INSTR)); |
fb978ca2 CL |
429 | if (err) |
430 | return -EFAULT; | |
431 | ||
432 | *(unsigned int *)bpt->saved_instr = instr; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
437 | int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) | |
438 | { | |
439 | int err; | |
440 | unsigned int instr = *(unsigned int *)bpt->saved_instr; | |
441 | unsigned int *addr = (unsigned int *)bpt->bpt_addr; | |
442 | ||
75346251 | 443 | err = patch_instruction(addr, ppc_inst(instr)); |
fb978ca2 CL |
444 | if (err) |
445 | return -EFAULT; | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
17ce452f JW |
450 | /* |
451 | * Global data | |
452 | */ | |
cc028297 | 453 | const struct kgdb_arch arch_kgdb_ops; |
17ce452f JW |
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 | ||
3cd99ac3 | 478 | __debugger_ipi = kgdb_debugger_ipi; |
17ce452f JW |
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 | } |