1 | // SPDX-License-Identifier: GPL-2.0-only |
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. |
12 | */ |
13 | |
14 | #include <linux/kernel.h> |
15 | #include <linux/kgdb.h> |
16 | #include <linux/smp.h> |
17 | #include <linux/signal.h> |
18 | #include <linux/ptrace.h> |
19 | #include <linux/kdebug.h> |
20 | #include <asm/current.h> |
21 | #include <asm/processor.h> |
22 | #include <asm/machdep.h> |
23 | #include <asm/debug.h> |
24 | #include <asm/code-patching.h> |
25 | #include <linux/slab.h> |
26 | #include <asm/inst.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 | #ifdef CONFIG_BOOKE_OR_40x |
49 | { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ |
50 | #if defined(CONFIG_PPC_85xx) |
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_PPC_85xx */ |
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 /* !CONFIG_BOOKE_OR_40x */ |
68 | { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ |
69 | #if defined(CONFIG_PPC_8xx) |
70 | { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ |
71 | #else /* ! CONFIG_PPC_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 | /** |
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(addr: regs->nip); |
116 | } |
117 | |
118 | static int kgdb_debugger_ipi(struct pt_regs *regs) |
119 | { |
120 | kgdb_nmicallback(raw_smp_processor_id(), regs); |
121 | return 0; |
122 | } |
123 | |
124 | #ifdef CONFIG_SMP |
125 | void kgdb_roundup_cpus(void) |
126 | { |
127 | smp_send_debugger_break(); |
128 | } |
129 | #endif |
130 | |
131 | /* KGDB functions to use existing PowerPC64 hooks. */ |
132 | static int kgdb_debugger(struct pt_regs *regs) |
133 | { |
134 | return !kgdb_handle_exception(ex_vector: 1, signo: computeSignal(tt: TRAP(regs)), |
135 | err_code: DIE_OOPS, regs); |
136 | } |
137 | |
138 | static int kgdb_handle_breakpoint(struct pt_regs *regs) |
139 | { |
140 | if (user_mode(regs)) |
141 | return 0; |
142 | |
143 | if (kgdb_handle_exception(ex_vector: 1, SIGTRAP, err_code: 0, regs) != 0) |
144 | return 0; |
145 | |
146 | if (*(u32 *)regs->nip == BREAK_INSTR) |
147 | regs_add_return_ip(regs, BREAK_INSTR_SIZE); |
148 | |
149 | return 1; |
150 | } |
151 | |
152 | static int kgdb_singlestep(struct pt_regs *regs) |
153 | { |
154 | if (user_mode(regs)) |
155 | return 0; |
156 | |
157 | kgdb_handle_exception(ex_vector: 0, SIGTRAP, err_code: 0, regs); |
158 | |
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(ex_vector: 0, signo: computeSignal(tt: TRAP(regs)), err_code: 0, regs) != 0) |
168 | return 0; |
169 | return 1; |
170 | } |
171 | |
172 | static int kgdb_break_match(struct pt_regs *regs) |
173 | { |
174 | if (user_mode(regs)) |
175 | return 0; |
176 | |
177 | if (kgdb_handle_exception(ex_vector: 0, signo: computeSignal(tt: TRAP(regs)), err_code: 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 | |
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_INT_FRAME_REGS); |
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 | |
211 | #ifdef CONFIG_PPC_85xx |
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 | |
234 | #define GDB_SIZEOF_REG sizeof(unsigned long) |
235 | #define GDB_SIZEOF_REG_U32 sizeof(u32) |
236 | |
237 | #ifdef CONFIG_PPC_85xx |
238 | #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long) |
239 | #else |
240 | #define GDB_SIZEOF_FLOAT_REG sizeof(u64) |
241 | #endif |
242 | |
243 | struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = |
244 | { |
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 | }; |
318 | |
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 */ |
332 | #if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) |
333 | if (current) |
334 | memcpy(mem, ¤t->thread.evr[regno-32], |
335 | dbg_reg_def[regno].size); |
336 | #else |
337 | /* fp registers not used by kernel, leave zero */ |
338 | memset(mem, 0, dbg_reg_def[regno].size); |
339 | #endif |
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 */ |
358 | #if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) |
359 | memcpy(¤t->thread.evr[regno-32], mem, |
360 | dbg_reg_def[regno].size); |
361 | #else |
362 | /* fp registers not used by kernel, leave zero */ |
363 | return 0; |
364 | #endif |
365 | } |
366 | |
367 | return 0; |
368 | } |
369 | |
370 | void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) |
371 | { |
372 | regs_set_return_ip(regs, pc); |
373 | } |
374 | |
375 | /* |
376 | * This function does PowerPC specific processing for interfacing to gdb. |
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: &ptr, long_val: &addr)) |
394 | regs_set_return_ip(linux_regs, addr); |
395 | |
396 | atomic_set(v: &kgdb_cpu_doing_single_step, i: -1); |
397 | /* set the trace bit if we're stepping */ |
398 | if (remcom_in_buffer[0] == 's') { |
399 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
400 | mtspr(SPRN_DBCR0, |
401 | mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); |
402 | regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE); |
403 | #else |
404 | regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE); |
405 | #endif |
406 | atomic_set(v: &kgdb_cpu_doing_single_step, |
407 | raw_smp_processor_id()); |
408 | } |
409 | return 0; |
410 | } |
411 | |
412 | return -1; |
413 | } |
414 | |
415 | int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) |
416 | { |
417 | u32 instr, *addr = (u32 *)bpt->bpt_addr; |
418 | int err; |
419 | |
420 | err = get_kernel_nofault(instr, addr); |
421 | if (err) |
422 | return err; |
423 | |
424 | err = patch_instruction(addr, ppc_inst(BREAK_INSTR)); |
425 | if (err) |
426 | return -EFAULT; |
427 | |
428 | *(u32 *)bpt->saved_instr = instr; |
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; |
437 | u32 *addr = (u32 *)bpt->bpt_addr; |
438 | |
439 | err = patch_instruction(addr, ppc_inst(instr)); |
440 | if (err) |
441 | return -EFAULT; |
442 | |
443 | return 0; |
444 | } |
445 | |
446 | /* |
447 | * Global data |
448 | */ |
449 | const struct kgdb_arch arch_kgdb_ops; |
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; |
461 | static void *old__debugger_break_match; |
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; |
471 | old__debugger_break_match = __debugger_break_match; |
472 | old__debugger_fault_handler = __debugger_fault_handler; |
473 | |
474 | __debugger_ipi = kgdb_debugger_ipi; |
475 | __debugger = kgdb_debugger; |
476 | __debugger_bpt = kgdb_handle_breakpoint; |
477 | __debugger_sstep = kgdb_singlestep; |
478 | __debugger_iabr_match = kgdb_iabr_match; |
479 | __debugger_break_match = kgdb_break_match; |
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; |
492 | __debugger_break_match = old__debugger_break_match; |
493 | __debugger_fault_handler = old__debugger_fault_handler; |
494 | } |
495 | |