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577b61ce | 1 | // SPDX-License-Identifier: GPL-2.0-only |
17ce452f JW |
2 | /* |
3 | * PowerPC backend to the KGDB stub. | |
4 | * | |
5 | * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu) | |
6 | * Copyright (C) 2003 Timesys Corporation. | |
7 | * Copyright (C) 2004-2006 MontaVista Software, Inc. | |
8 | * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com) | |
9 | * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and | |
10 | * Sergei Shtylyov <sshtylyov@ru.mvista.com> | |
11 | * Copyright (C) 2007-2008 Wind River Systems, Inc. | |
17ce452f JW |
12 | */ |
13 | ||
14 | #include <linux/kernel.h> | |
17ce452f JW |
15 | #include <linux/kgdb.h> |
16 | #include <linux/smp.h> | |
17 | #include <linux/signal.h> | |
18 | #include <linux/ptrace.h> | |
ba797b28 | 19 | #include <linux/kdebug.h> |
17ce452f JW |
20 | #include <asm/current.h> |
21 | #include <asm/processor.h> | |
22 | #include <asm/machdep.h> | |
cad3c834 | 23 | #include <asm/debug.h> |
fb978ca2 | 24 | #include <asm/code-patching.h> |
5f630401 | 25 | #include <linux/slab.h> |
75346251 | 26 | #include <asm/inst.h> |
17ce452f JW |
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 */ | |
047a6fd4 | 48 | #ifdef CONFIG_BOOKE_OR_40x |
17ce452f | 49 | { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ |
dfc3095c | 50 | #if defined(CONFIG_PPC_85xx) |
17ce452f JW |
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 */ | |
af901ca1 | 56 | { 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */ |
17ce452f JW |
57 | { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */ |
58 | { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */ | |
59 | { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */ | |
dfc3095c | 60 | #else /* ! CONFIG_PPC_85xx */ |
17ce452f JW |
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 | |
047a6fd4 | 67 | #else /* !CONFIG_BOOKE_OR_40x */ |
17ce452f | 68 | { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ |
968159c0 | 69 | #if defined(CONFIG_PPC_8xx) |
17ce452f | 70 | { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ |
968159c0 | 71 | #else /* ! CONFIG_PPC_8xx */ |
17ce452f JW |
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 | ||
949616cf TC |
103 | /** |
104 | * | |
105 | * kgdb_skipexception - Bail out of KGDB when we've been triggered. | |
106 | * @exception: Exception vector number | |
107 | * @regs: Current &struct pt_regs. | |
108 | * | |
109 | * On some architectures we need to skip a breakpoint exception when | |
110 | * it occurs after a breakpoint has been removed. | |
111 | * | |
112 | */ | |
113 | int kgdb_skipexception(int exception, struct pt_regs *regs) | |
114 | { | |
115 | return kgdb_isremovedbreak(regs->nip); | |
116 | } | |
117 | ||
3cd99ac3 | 118 | static int kgdb_debugger_ipi(struct pt_regs *regs) |
17ce452f JW |
119 | { |
120 | kgdb_nmicallback(raw_smp_processor_id(), regs); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_SMP | |
9ef7fa50 | 125 | void kgdb_roundup_cpus(void) |
17ce452f | 126 | { |
e0476371 | 127 | smp_send_debugger_break(); |
17ce452f JW |
128 | } |
129 | #endif | |
130 | ||
131 | /* KGDB functions to use existing PowerPC64 hooks. */ | |
132 | static int kgdb_debugger(struct pt_regs *regs) | |
133 | { | |
ba797b28 JW |
134 | return !kgdb_handle_exception(1, computeSignal(TRAP(regs)), |
135 | DIE_OOPS, regs); | |
17ce452f JW |
136 | } |
137 | ||
138 | static int kgdb_handle_breakpoint(struct pt_regs *regs) | |
139 | { | |
140 | if (user_mode(regs)) | |
141 | return 0; | |
142 | ||
ba797b28 | 143 | if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) |
17ce452f JW |
144 | return 0; |
145 | ||
fb978ca2 | 146 | if (*(u32 *)regs->nip == BREAK_INSTR) |
59dc5bfc | 147 | regs_add_return_ip(regs, BREAK_INSTR_SIZE); |
17ce452f JW |
148 | |
149 | return 1; | |
150 | } | |
151 | ||
152 | static int kgdb_singlestep(struct pt_regs *regs) | |
153 | { | |
17ce452f JW |
154 | if (user_mode(regs)) |
155 | return 0; | |
156 | ||
17ce452f JW |
157 | kgdb_handle_exception(0, SIGTRAP, 0, regs); |
158 | ||
17ce452f JW |
159 | return 1; |
160 | } | |
161 | ||
162 | static int kgdb_iabr_match(struct pt_regs *regs) | |
163 | { | |
164 | if (user_mode(regs)) | |
165 | return 0; | |
166 | ||
167 | if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) | |
168 | return 0; | |
169 | return 1; | |
170 | } | |
171 | ||
9422de3e | 172 | static int kgdb_break_match(struct pt_regs *regs) |
17ce452f JW |
173 | { |
174 | if (user_mode(regs)) | |
175 | return 0; | |
176 | ||
177 | if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) | |
178 | return 0; | |
179 | return 1; | |
180 | } | |
181 | ||
182 | #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0) | |
183 | ||
184 | #define PACK32(ptr, src) do { \ | |
185 | u32 *ptr32; \ | |
186 | ptr32 = (u32 *)ptr; \ | |
187 | *(ptr32++) = (src); \ | |
188 | ptr = (unsigned long *)ptr32; \ | |
189 | } while (0) | |
190 | ||
17ce452f JW |
191 | void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) |
192 | { | |
193 | struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + | |
194 | STACK_FRAME_OVERHEAD); | |
195 | unsigned long *ptr = gdb_regs; | |
196 | int reg; | |
197 | ||
198 | memset(gdb_regs, 0, NUMREGBYTES); | |
199 | ||
200 | /* Regs GPR0-2 */ | |
201 | for (reg = 0; reg < 3; reg++) | |
202 | PACK64(ptr, regs->gpr[reg]); | |
203 | ||
204 | /* Regs GPR3-13 are caller saved, not in regs->gpr[] */ | |
205 | ptr += 11; | |
206 | ||
207 | /* Regs GPR14-31 */ | |
208 | for (reg = 14; reg < 32; reg++) | |
209 | PACK64(ptr, regs->gpr[reg]); | |
210 | ||
dfc3095c | 211 | #ifdef CONFIG_PPC_85xx |
17ce452f JW |
212 | #ifdef CONFIG_SPE |
213 | for (reg = 0; reg < 32; reg++) | |
214 | PACK64(ptr, p->thread.evr[reg]); | |
215 | #else | |
216 | ptr += 32; | |
217 | #endif | |
218 | #else | |
219 | /* fp registers not used by kernel, leave zero */ | |
220 | ptr += 32 * 8 / sizeof(long); | |
221 | #endif | |
222 | ||
223 | PACK64(ptr, regs->nip); | |
224 | PACK64(ptr, regs->msr); | |
225 | PACK32(ptr, regs->ccr); | |
226 | PACK64(ptr, regs->link); | |
227 | PACK64(ptr, regs->ctr); | |
228 | PACK32(ptr, regs->xer); | |
229 | ||
230 | BUG_ON((unsigned long)ptr > | |
231 | (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); | |
232 | } | |
233 | ||
ff10b88b DD |
234 | #define GDB_SIZEOF_REG sizeof(unsigned long) |
235 | #define GDB_SIZEOF_REG_U32 sizeof(u32) | |
17ce452f | 236 | |
dfc3095c | 237 | #ifdef CONFIG_PPC_85xx |
ff10b88b DD |
238 | #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long) |
239 | #else | |
240 | #define GDB_SIZEOF_FLOAT_REG sizeof(u64) | |
241 | #endif | |
17ce452f | 242 | |
ff10b88b | 243 | struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = |
17ce452f | 244 | { |
ff10b88b DD |
245 | { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) }, |
246 | { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) }, | |
247 | { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) }, | |
248 | { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) }, | |
249 | { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) }, | |
250 | { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) }, | |
251 | { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) }, | |
252 | { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) }, | |
253 | { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) }, | |
254 | { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) }, | |
255 | { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) }, | |
256 | { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) }, | |
257 | { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) }, | |
258 | { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) }, | |
259 | { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) }, | |
260 | { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) }, | |
261 | { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) }, | |
262 | { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) }, | |
263 | { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) }, | |
264 | { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) }, | |
265 | { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) }, | |
266 | { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) }, | |
267 | { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) }, | |
268 | { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) }, | |
269 | { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) }, | |
270 | { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) }, | |
271 | { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) }, | |
272 | { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) }, | |
273 | { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) }, | |
274 | { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) }, | |
275 | { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) }, | |
276 | { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) }, | |
277 | ||
278 | { "f0", GDB_SIZEOF_FLOAT_REG, 0 }, | |
279 | { "f1", GDB_SIZEOF_FLOAT_REG, 1 }, | |
280 | { "f2", GDB_SIZEOF_FLOAT_REG, 2 }, | |
281 | { "f3", GDB_SIZEOF_FLOAT_REG, 3 }, | |
282 | { "f4", GDB_SIZEOF_FLOAT_REG, 4 }, | |
283 | { "f5", GDB_SIZEOF_FLOAT_REG, 5 }, | |
284 | { "f6", GDB_SIZEOF_FLOAT_REG, 6 }, | |
285 | { "f7", GDB_SIZEOF_FLOAT_REG, 7 }, | |
286 | { "f8", GDB_SIZEOF_FLOAT_REG, 8 }, | |
287 | { "f9", GDB_SIZEOF_FLOAT_REG, 9 }, | |
288 | { "f10", GDB_SIZEOF_FLOAT_REG, 10 }, | |
289 | { "f11", GDB_SIZEOF_FLOAT_REG, 11 }, | |
290 | { "f12", GDB_SIZEOF_FLOAT_REG, 12 }, | |
291 | { "f13", GDB_SIZEOF_FLOAT_REG, 13 }, | |
292 | { "f14", GDB_SIZEOF_FLOAT_REG, 14 }, | |
293 | { "f15", GDB_SIZEOF_FLOAT_REG, 15 }, | |
294 | { "f16", GDB_SIZEOF_FLOAT_REG, 16 }, | |
295 | { "f17", GDB_SIZEOF_FLOAT_REG, 17 }, | |
296 | { "f18", GDB_SIZEOF_FLOAT_REG, 18 }, | |
297 | { "f19", GDB_SIZEOF_FLOAT_REG, 19 }, | |
298 | { "f20", GDB_SIZEOF_FLOAT_REG, 20 }, | |
299 | { "f21", GDB_SIZEOF_FLOAT_REG, 21 }, | |
300 | { "f22", GDB_SIZEOF_FLOAT_REG, 22 }, | |
301 | { "f23", GDB_SIZEOF_FLOAT_REG, 23 }, | |
302 | { "f24", GDB_SIZEOF_FLOAT_REG, 24 }, | |
303 | { "f25", GDB_SIZEOF_FLOAT_REG, 25 }, | |
304 | { "f26", GDB_SIZEOF_FLOAT_REG, 26 }, | |
305 | { "f27", GDB_SIZEOF_FLOAT_REG, 27 }, | |
306 | { "f28", GDB_SIZEOF_FLOAT_REG, 28 }, | |
307 | { "f29", GDB_SIZEOF_FLOAT_REG, 29 }, | |
308 | { "f30", GDB_SIZEOF_FLOAT_REG, 30 }, | |
309 | { "f31", GDB_SIZEOF_FLOAT_REG, 31 }, | |
310 | ||
311 | { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) }, | |
312 | { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) }, | |
313 | { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) }, | |
314 | { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) }, | |
315 | { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) }, | |
316 | { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) }, | |
317 | }; | |
17ce452f | 318 | |
ff10b88b DD |
319 | char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) |
320 | { | |
321 | if (regno >= DBG_MAX_REG_NUM || regno < 0) | |
322 | return NULL; | |
323 | ||
324 | if (regno < 32 || regno >= 64) | |
325 | /* First 0 -> 31 gpr registers*/ | |
326 | /* pc, msr, ls... registers 64 -> 69 */ | |
327 | memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, | |
328 | dbg_reg_def[regno].size); | |
329 | ||
330 | if (regno >= 32 && regno < 64) { | |
331 | /* FP registers 32 -> 63 */ | |
dfc3095c | 332 | #if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) |
ff10b88b | 333 | if (current) |
e3839ed8 | 334 | memcpy(mem, ¤t->thread.evr[regno-32], |
ff10b88b | 335 | dbg_reg_def[regno].size); |
17ce452f | 336 | #else |
ff10b88b DD |
337 | /* fp registers not used by kernel, leave zero */ |
338 | memset(mem, 0, dbg_reg_def[regno].size); | |
17ce452f | 339 | #endif |
ff10b88b DD |
340 | } |
341 | ||
342 | return dbg_reg_def[regno].name; | |
343 | } | |
344 | ||
345 | int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) | |
346 | { | |
347 | if (regno >= DBG_MAX_REG_NUM || regno < 0) | |
348 | return -EINVAL; | |
349 | ||
350 | if (regno < 32 || regno >= 64) | |
351 | /* First 0 -> 31 gpr registers*/ | |
352 | /* pc, msr, ls... registers 64 -> 69 */ | |
353 | memcpy((void *)regs + dbg_reg_def[regno].offset, mem, | |
354 | dbg_reg_def[regno].size); | |
355 | ||
356 | if (regno >= 32 && regno < 64) { | |
357 | /* FP registers 32 -> 63 */ | |
dfc3095c | 358 | #if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) |
e3839ed8 | 359 | memcpy(¤t->thread.evr[regno-32], mem, |
ff10b88b | 360 | dbg_reg_def[regno].size); |
17ce452f | 361 | #else |
ff10b88b DD |
362 | /* fp registers not used by kernel, leave zero */ |
363 | return 0; | |
17ce452f | 364 | #endif |
ff10b88b | 365 | } |
17ce452f | 366 | |
ff10b88b | 367 | return 0; |
17ce452f JW |
368 | } |
369 | ||
dcc78711 JW |
370 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) |
371 | { | |
59dc5bfc | 372 | regs_set_return_ip(regs, pc); |
dcc78711 JW |
373 | } |
374 | ||
17ce452f | 375 | /* |
89f7d292 | 376 | * This function does PowerPC specific processing for interfacing to gdb. |
17ce452f JW |
377 | */ |
378 | int kgdb_arch_handle_exception(int vector, int signo, int err_code, | |
379 | char *remcom_in_buffer, char *remcom_out_buffer, | |
380 | struct pt_regs *linux_regs) | |
381 | { | |
382 | char *ptr = &remcom_in_buffer[1]; | |
383 | unsigned long addr; | |
384 | ||
385 | switch (remcom_in_buffer[0]) { | |
386 | /* | |
387 | * sAA..AA Step one instruction from AA..AA | |
388 | * This will return an error to gdb .. | |
389 | */ | |
390 | case 's': | |
391 | case 'c': | |
392 | /* handle the optional parameter */ | |
393 | if (kgdb_hex2long(&ptr, &addr)) | |
59dc5bfc | 394 | regs_set_return_ip(linux_regs, addr); |
17ce452f JW |
395 | |
396 | atomic_set(&kgdb_cpu_doing_single_step, -1); | |
397 | /* set the trace bit if we're stepping */ | |
398 | if (remcom_in_buffer[0] == 's') { | |
172ae2e7 | 399 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
17ce452f JW |
400 | mtspr(SPRN_DBCR0, |
401 | mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); | |
59dc5bfc | 402 | regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE); |
17ce452f | 403 | #else |
59dc5bfc | 404 | regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE); |
17ce452f | 405 | #endif |
d7161a65 JW |
406 | atomic_set(&kgdb_cpu_doing_single_step, |
407 | raw_smp_processor_id()); | |
17ce452f JW |
408 | } |
409 | return 0; | |
410 | } | |
411 | ||
412 | return -1; | |
413 | } | |
414 | ||
fb978ca2 CL |
415 | int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) |
416 | { | |
69d4d6e5 | 417 | u32 instr, *addr = (u32 *)bpt->bpt_addr; |
fb978ca2 | 418 | int err; |
fb978ca2 | 419 | |
69d4d6e5 | 420 | err = get_kernel_nofault(instr, addr); |
fb978ca2 CL |
421 | if (err) |
422 | return err; | |
423 | ||
75346251 | 424 | err = patch_instruction(addr, ppc_inst(BREAK_INSTR)); |
fb978ca2 CL |
425 | if (err) |
426 | return -EFAULT; | |
427 | ||
69d4d6e5 | 428 | *(u32 *)bpt->saved_instr = instr; |
fb978ca2 CL |
429 | |
430 | return 0; | |
431 | } | |
432 | ||
433 | int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) | |
434 | { | |
435 | int err; | |
436 | unsigned int instr = *(unsigned int *)bpt->saved_instr; | |
69d4d6e5 | 437 | u32 *addr = (u32 *)bpt->bpt_addr; |
fb978ca2 | 438 | |
75346251 | 439 | err = patch_instruction(addr, ppc_inst(instr)); |
fb978ca2 CL |
440 | if (err) |
441 | return -EFAULT; | |
442 | ||
443 | return 0; | |
444 | } | |
445 | ||
17ce452f JW |
446 | /* |
447 | * Global data | |
448 | */ | |
cc028297 | 449 | const struct kgdb_arch arch_kgdb_ops; |
17ce452f JW |
450 | |
451 | static int kgdb_not_implemented(struct pt_regs *regs) | |
452 | { | |
453 | return 0; | |
454 | } | |
455 | ||
456 | static void *old__debugger_ipi; | |
457 | static void *old__debugger; | |
458 | static void *old__debugger_bpt; | |
459 | static void *old__debugger_sstep; | |
460 | static void *old__debugger_iabr_match; | |
9422de3e | 461 | static void *old__debugger_break_match; |
17ce452f JW |
462 | static void *old__debugger_fault_handler; |
463 | ||
464 | int kgdb_arch_init(void) | |
465 | { | |
466 | old__debugger_ipi = __debugger_ipi; | |
467 | old__debugger = __debugger; | |
468 | old__debugger_bpt = __debugger_bpt; | |
469 | old__debugger_sstep = __debugger_sstep; | |
470 | old__debugger_iabr_match = __debugger_iabr_match; | |
9422de3e | 471 | old__debugger_break_match = __debugger_break_match; |
17ce452f JW |
472 | old__debugger_fault_handler = __debugger_fault_handler; |
473 | ||
3cd99ac3 | 474 | __debugger_ipi = kgdb_debugger_ipi; |
17ce452f JW |
475 | __debugger = kgdb_debugger; |
476 | __debugger_bpt = kgdb_handle_breakpoint; | |
477 | __debugger_sstep = kgdb_singlestep; | |
478 | __debugger_iabr_match = kgdb_iabr_match; | |
9422de3e | 479 | __debugger_break_match = kgdb_break_match; |
17ce452f JW |
480 | __debugger_fault_handler = kgdb_not_implemented; |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | void kgdb_arch_exit(void) | |
486 | { | |
487 | __debugger_ipi = old__debugger_ipi; | |
488 | __debugger = old__debugger; | |
489 | __debugger_bpt = old__debugger_bpt; | |
490 | __debugger_sstep = old__debugger_sstep; | |
491 | __debugger_iabr_match = old__debugger_iabr_match; | |
fa592464 | 492 | __debugger_break_match = old__debugger_break_match; |
17ce452f JW |
493 | __debugger_fault_handler = old__debugger_fault_handler; |
494 | } |