1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * arch/hexagon/kernel/kgdb.c - Hexagon KGDB S !! 2 * Originally written by Glenn Engel, Lake Stevens Instrument Division
4 * 3 *
5 * Copyright (c) 2011-2012, The Linux Foundati !! 4 * Contributed by HP Systems
>> 5 *
>> 6 * Modified for Linux/MIPS (and MIPS in general) by Andreas Busse
>> 7 * Send complaints, suggestions etc. to <andy@waldorf-gmbh.de>
>> 8 *
>> 9 * Copyright (C) 1995 Andreas Busse
>> 10 *
>> 11 * Copyright (C) 2003 MontaVista Software Inc.
>> 12 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
>> 13 *
>> 14 * Copyright (C) 2004-2005 MontaVista Software Inc.
>> 15 * Author: Manish Lachwani, mlachwani@mvista.com or manish@koffee-break.com
>> 16 *
>> 17 * Copyright (C) 2007-2008 Wind River Systems, Inc.
>> 18 * Author/Maintainer: Jason Wessel, jason.wessel@windriver.com
>> 19 *
>> 20 * This file is licensed under the terms of the GNU General Public License
>> 21 * version 2. This program is licensed "as is" without any warranty of any
>> 22 * kind, whether express or implied.
6 */ 23 */
7 24
8 #include <linux/irq.h> !! 25 #include <linux/ptrace.h> /* for linux pt_regs struct */
9 #include <linux/sched.h> <<
10 #include <linux/sched/task_stack.h> <<
11 #include <linux/kdebug.h> <<
12 #include <linux/kgdb.h> 26 #include <linux/kgdb.h>
13 !! 27 #include <linux/kdebug.h>
14 /* All registers are 4 bytes, for now */ !! 28 #include <linux/sched.h>
15 #define GDB_SIZEOF_REG 4 !! 29 #include <linux/smp.h>
16 !! 30 #include <asm/inst.h>
17 /* The register names are used during printing !! 31 #include <asm/fpu.h>
18 * Keep these at three letters to pretty-print !! 32 #include <asm/cacheflush.h>
19 struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_N !! 33 #include <asm/processor.h>
20 { " r0", GDB_SIZEOF_REG, offsetof(stru !! 34 #include <asm/sigcontext.h>
21 { " r1", GDB_SIZEOF_REG, offsetof(stru !! 35 #include <asm/irq_regs.h>
22 { " r2", GDB_SIZEOF_REG, offsetof(stru !! 36
23 { " r3", GDB_SIZEOF_REG, offsetof(stru !! 37 static struct hard_trap_info {
24 { " r4", GDB_SIZEOF_REG, offsetof(stru !! 38 unsigned char tt; /* Trap type code for MIPS R3xxx and R4xxx */
25 { " r5", GDB_SIZEOF_REG, offsetof(stru !! 39 unsigned char signo; /* Signal that we map this trap into */
26 { " r6", GDB_SIZEOF_REG, offsetof(stru !! 40 } hard_trap_info[] = {
27 { " r7", GDB_SIZEOF_REG, offsetof(stru !! 41 { 6, SIGBUS }, /* instruction bus error */
28 { " r8", GDB_SIZEOF_REG, offsetof(stru !! 42 { 7, SIGBUS }, /* data bus error */
29 { " r9", GDB_SIZEOF_REG, offsetof(stru !! 43 { 9, SIGTRAP }, /* break */
30 { "r10", GDB_SIZEOF_REG, offsetof(stru !! 44 /* { 11, SIGILL }, */ /* CPU unusable */
31 { "r11", GDB_SIZEOF_REG, offsetof(stru !! 45 { 12, SIGFPE }, /* overflow */
32 { "r12", GDB_SIZEOF_REG, offsetof(stru !! 46 { 13, SIGTRAP }, /* trap */
33 { "r13", GDB_SIZEOF_REG, offsetof(stru !! 47 { 14, SIGSEGV }, /* virtual instruction cache coherency */
34 { "r14", GDB_SIZEOF_REG, offsetof(stru !! 48 { 15, SIGFPE }, /* floating point exception */
35 { "r15", GDB_SIZEOF_REG, offsetof(stru !! 49 { 23, SIGSEGV }, /* watch */
36 { "r16", GDB_SIZEOF_REG, offsetof(stru !! 50 { 31, SIGSEGV }, /* virtual data cache coherency */
37 { "r17", GDB_SIZEOF_REG, offsetof(stru !! 51 { 0, 0} /* Must be last */
38 { "r18", GDB_SIZEOF_REG, offsetof(stru <<
39 { "r19", GDB_SIZEOF_REG, offsetof(stru <<
40 { "r20", GDB_SIZEOF_REG, offsetof(stru <<
41 { "r21", GDB_SIZEOF_REG, offsetof(stru <<
42 { "r22", GDB_SIZEOF_REG, offsetof(stru <<
43 { "r23", GDB_SIZEOF_REG, offsetof(stru <<
44 { "r24", GDB_SIZEOF_REG, offsetof(stru <<
45 { "r25", GDB_SIZEOF_REG, offsetof(stru <<
46 { "r26", GDB_SIZEOF_REG, offsetof(stru <<
47 { "r27", GDB_SIZEOF_REG, offsetof(stru <<
48 { "r28", GDB_SIZEOF_REG, offsetof(stru <<
49 { "r29", GDB_SIZEOF_REG, offsetof(stru <<
50 { "r30", GDB_SIZEOF_REG, offsetof(stru <<
51 { "r31", GDB_SIZEOF_REG, offsetof(stru <<
52 <<
53 { "usr", GDB_SIZEOF_REG, offsetof(stru <<
54 { "preds", GDB_SIZEOF_REG, offsetof(st <<
55 { " m0", GDB_SIZEOF_REG, offsetof(stru <<
56 { " m1", GDB_SIZEOF_REG, offsetof(stru <<
57 { "sa0", GDB_SIZEOF_REG, offsetof(stru <<
58 { "sa1", GDB_SIZEOF_REG, offsetof(stru <<
59 { "lc0", GDB_SIZEOF_REG, offsetof(stru <<
60 { "lc1", GDB_SIZEOF_REG, offsetof(stru <<
61 { " gp", GDB_SIZEOF_REG, offsetof(stru <<
62 { "ugp", GDB_SIZEOF_REG, offsetof(stru <<
63 { "cs0", GDB_SIZEOF_REG, offsetof(stru <<
64 { "cs1", GDB_SIZEOF_REG, offsetof(stru <<
65 { "psp", GDB_SIZEOF_REG, offsetof(stru <<
66 { "elr", GDB_SIZEOF_REG, offsetof(stru <<
67 { "est", GDB_SIZEOF_REG, offsetof(stru <<
68 { "badva", GDB_SIZEOF_REG, offsetof(st <<
69 { "restart_r0", GDB_SIZEOF_REG, offset <<
70 { "syscall_nr", GDB_SIZEOF_REG, offset <<
71 }; 52 };
72 53
73 const struct kgdb_arch arch_kgdb_ops = { !! 54 struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
74 /* trap0(#0xDB) 0x0cdb0054 */ !! 55 {
75 .gdb_bpt_instr = {0x54, 0x00, 0xdb, 0x !! 56 { "zero", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[0]) },
>> 57 { "at", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[1]) },
>> 58 { "v0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[2]) },
>> 59 { "v1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[3]) },
>> 60 { "a0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[4]) },
>> 61 { "a1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[5]) },
>> 62 { "a2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[6]) },
>> 63 { "a3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[7]) },
>> 64 { "t0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[8]) },
>> 65 { "t1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[9]) },
>> 66 { "t2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[10]) },
>> 67 { "t3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[11]) },
>> 68 { "t4", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[12]) },
>> 69 { "t5", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[13]) },
>> 70 { "t6", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[14]) },
>> 71 { "t7", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[15]) },
>> 72 { "s0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[16]) },
>> 73 { "s1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[17]) },
>> 74 { "s2", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[18]) },
>> 75 { "s3", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[19]) },
>> 76 { "s4", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[20]) },
>> 77 { "s5", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[21]) },
>> 78 { "s6", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[22]) },
>> 79 { "s7", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[23]) },
>> 80 { "t8", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[24]) },
>> 81 { "t9", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[25]) },
>> 82 { "k0", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[26]) },
>> 83 { "k1", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[27]) },
>> 84 { "gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[28]) },
>> 85 { "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[29]) },
>> 86 { "s8", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[30]) },
>> 87 { "ra", GDB_SIZEOF_REG, offsetof(struct pt_regs, regs[31]) },
>> 88 { "sr", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_status) },
>> 89 { "lo", GDB_SIZEOF_REG, offsetof(struct pt_regs, lo) },
>> 90 { "hi", GDB_SIZEOF_REG, offsetof(struct pt_regs, hi) },
>> 91 { "bad", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_badvaddr) },
>> 92 { "cause", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_cause) },
>> 93 { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, cp0_epc) },
>> 94 { "f0", GDB_SIZEOF_REG, 0 },
>> 95 { "f1", GDB_SIZEOF_REG, 1 },
>> 96 { "f2", GDB_SIZEOF_REG, 2 },
>> 97 { "f3", GDB_SIZEOF_REG, 3 },
>> 98 { "f4", GDB_SIZEOF_REG, 4 },
>> 99 { "f5", GDB_SIZEOF_REG, 5 },
>> 100 { "f6", GDB_SIZEOF_REG, 6 },
>> 101 { "f7", GDB_SIZEOF_REG, 7 },
>> 102 { "f8", GDB_SIZEOF_REG, 8 },
>> 103 { "f9", GDB_SIZEOF_REG, 9 },
>> 104 { "f10", GDB_SIZEOF_REG, 10 },
>> 105 { "f11", GDB_SIZEOF_REG, 11 },
>> 106 { "f12", GDB_SIZEOF_REG, 12 },
>> 107 { "f13", GDB_SIZEOF_REG, 13 },
>> 108 { "f14", GDB_SIZEOF_REG, 14 },
>> 109 { "f15", GDB_SIZEOF_REG, 15 },
>> 110 { "f16", GDB_SIZEOF_REG, 16 },
>> 111 { "f17", GDB_SIZEOF_REG, 17 },
>> 112 { "f18", GDB_SIZEOF_REG, 18 },
>> 113 { "f19", GDB_SIZEOF_REG, 19 },
>> 114 { "f20", GDB_SIZEOF_REG, 20 },
>> 115 { "f21", GDB_SIZEOF_REG, 21 },
>> 116 { "f22", GDB_SIZEOF_REG, 22 },
>> 117 { "f23", GDB_SIZEOF_REG, 23 },
>> 118 { "f24", GDB_SIZEOF_REG, 24 },
>> 119 { "f25", GDB_SIZEOF_REG, 25 },
>> 120 { "f26", GDB_SIZEOF_REG, 26 },
>> 121 { "f27", GDB_SIZEOF_REG, 27 },
>> 122 { "f28", GDB_SIZEOF_REG, 28 },
>> 123 { "f29", GDB_SIZEOF_REG, 29 },
>> 124 { "f30", GDB_SIZEOF_REG, 30 },
>> 125 { "f31", GDB_SIZEOF_REG, 31 },
>> 126 { "fsr", GDB_SIZEOF_REG, 0 },
>> 127 { "fir", GDB_SIZEOF_REG, 0 },
76 }; 128 };
77 129
78 char *dbg_get_reg(int regno, void *mem, struct !! 130 int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
79 { 131 {
80 if (regno >= DBG_MAX_REG_NUM || regno !! 132 int fp_reg;
81 return NULL; <<
82 133
83 *((unsigned long *) mem) = *((unsigned !! 134 if (regno < 0 || regno >= DBG_MAX_REG_NUM)
84 dbg_reg_def[regno].offset)); !! 135 return -EINVAL;
85 136
86 return dbg_reg_def[regno].name; !! 137 if (dbg_reg_def[regno].offset != -1 && regno < 38) {
>> 138 memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
>> 139 dbg_reg_def[regno].size);
>> 140 } else if (current && dbg_reg_def[regno].offset != -1 && regno < 72) {
>> 141 /* FP registers 38 -> 69 */
>> 142 if (!(regs->cp0_status & ST0_CU1))
>> 143 return 0;
>> 144 if (regno == 70) {
>> 145 /* Process the fcr31/fsr (register 70) */
>> 146 memcpy((void *)¤t->thread.fpu.fcr31, mem,
>> 147 dbg_reg_def[regno].size);
>> 148 goto out_save;
>> 149 } else if (regno == 71) {
>> 150 /* Ignore the fir (register 71) */
>> 151 goto out_save;
>> 152 }
>> 153 fp_reg = dbg_reg_def[regno].offset;
>> 154 memcpy((void *)¤t->thread.fpu.fpr[fp_reg], mem,
>> 155 dbg_reg_def[regno].size);
>> 156 out_save:
>> 157 restore_fp(current);
>> 158 }
>> 159
>> 160 return 0;
87 } 161 }
88 162
89 int dbg_set_reg(int regno, void *mem, struct p !! 163 char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
90 { 164 {
>> 165 int fp_reg;
>> 166
91 if (regno >= DBG_MAX_REG_NUM || regno 167 if (regno >= DBG_MAX_REG_NUM || regno < 0)
92 return -EINVAL; !! 168 return NULL;
93 169
94 *((unsigned long *) ((void *)regs + db !! 170 if (dbg_reg_def[regno].offset != -1 && regno < 38) {
95 *((unsigned long *) mem); !! 171 /* First 38 registers */
>> 172 memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
>> 173 dbg_reg_def[regno].size);
>> 174 } else if (current && dbg_reg_def[regno].offset != -1 && regno < 72) {
>> 175 /* FP registers 38 -> 69 */
>> 176 if (!(regs->cp0_status & ST0_CU1))
>> 177 goto out;
>> 178 save_fp(current);
>> 179 if (regno == 70) {
>> 180 /* Process the fcr31/fsr (register 70) */
>> 181 memcpy(mem, (void *)¤t->thread.fpu.fcr31,
>> 182 dbg_reg_def[regno].size);
>> 183 goto out;
>> 184 } else if (regno == 71) {
>> 185 /* Ignore the fir (register 71) */
>> 186 memset(mem, 0, dbg_reg_def[regno].size);
>> 187 goto out;
>> 188 }
>> 189 fp_reg = dbg_reg_def[regno].offset;
>> 190 memcpy(mem, (void *)¤t->thread.fpu.fpr[fp_reg],
>> 191 dbg_reg_def[regno].size);
>> 192 }
>> 193
>> 194 out:
>> 195 return dbg_reg_def[regno].name;
96 196
97 return 0; <<
98 } 197 }
99 198
100 void kgdb_arch_set_pc(struct pt_regs *regs, un !! 199 void arch_kgdb_breakpoint(void)
101 { 200 {
102 instruction_pointer(regs) = pc; !! 201 __asm__ __volatile__(
>> 202 ".globl breakinst\n\t"
>> 203 ".set\tnoreorder\n\t"
>> 204 "nop\n"
>> 205 "breakinst:\tbreak\n\t"
>> 206 "nop\n\t"
>> 207 ".set\treorder");
103 } 208 }
104 209
105 !! 210 static int compute_signal(int tt)
106 /* Not yet working */ <<
107 void sleeping_thread_to_gdb_regs(unsigned long <<
108 struct task_s <<
109 { 211 {
110 struct pt_regs *thread_regs; !! 212 struct hard_trap_info *ht;
111 213
112 if (task == NULL) !! 214 for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
113 return; !! 215 if (ht->tt == tt)
>> 216 return ht->signo;
114 217
115 /* Initialize to zero */ !! 218 return SIGHUP; /* default for things we don't know about */
116 memset(gdb_regs, 0, NUMREGBYTES); <<
117 <<
118 /* Otherwise, we have only some regist <<
119 thread_regs = task_pt_regs(task); <<
120 gdb_regs[0] = thread_regs->r00; <<
121 } 219 }
122 220
123 /** !! 221 /*
124 * kgdb_arch_handle_exception - Handle archite !! 222 * Similar to regs_to_gdb_regs() except that process is sleeping and so
125 * @vector: The error vector of the exception !! 223 * we may not be able to get all the info.
126 * @signo: The signal number of the exception <<
127 * @err_code: The error code of the exception <<
128 * @remcom_in_buffer: The buffer of the packet <<
129 * @remcom_out_buffer: The buffer of %BUFMAX b <<
130 * @regs: The &struct pt_regs of the current p <<
131 * <<
132 * This function MUST handle the 'c' and 's' c <<
133 * as well packets to set / remove a hardware <<
134 * If there are additional packets which the h <<
135 * they are handled here. The code should ret <<
136 * process more packets, and a %0 or %1 if it <<
137 * kgdb callback. <<
138 * <<
139 * Not yet working. <<
140 */ 224 */
141 int kgdb_arch_handle_exception(int vector, int !! 225 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
142 char *remcom_in <<
143 struct pt_regs <<
144 { 226 {
145 switch (remcom_in_buffer[0]) { !! 227 int reg;
146 case 's': !! 228 #if (KGDB_GDB_REG_SIZE == 32)
147 case 'c': !! 229 u32 *ptr = (u32 *)gdb_regs;
148 return 0; !! 230 #else
149 } !! 231 u64 *ptr = (u64 *)gdb_regs;
150 /* Stay in the debugger. */ !! 232 #endif
151 return -1; !! 233
>> 234 for (reg = 0; reg < 16; reg++)
>> 235 *(ptr++) = 0;
>> 236
>> 237 /* S0 - S7 */
>> 238 *(ptr++) = p->thread.reg16;
>> 239 *(ptr++) = p->thread.reg17;
>> 240 *(ptr++) = p->thread.reg18;
>> 241 *(ptr++) = p->thread.reg19;
>> 242 *(ptr++) = p->thread.reg20;
>> 243 *(ptr++) = p->thread.reg21;
>> 244 *(ptr++) = p->thread.reg22;
>> 245 *(ptr++) = p->thread.reg23;
>> 246
>> 247 for (reg = 24; reg < 28; reg++)
>> 248 *(ptr++) = 0;
>> 249
>> 250 /* GP, SP, FP, RA */
>> 251 *(ptr++) = (long)p;
>> 252 *(ptr++) = p->thread.reg29;
>> 253 *(ptr++) = p->thread.reg30;
>> 254 *(ptr++) = p->thread.reg31;
>> 255
>> 256 *(ptr++) = p->thread.cp0_status;
>> 257
>> 258 /* lo, hi */
>> 259 *(ptr++) = 0;
>> 260 *(ptr++) = 0;
>> 261
>> 262 /*
>> 263 * BadVAddr, Cause
>> 264 * Ideally these would come from the last exception frame up the stack
>> 265 * but that requires unwinding, otherwise we can't know much for sure.
>> 266 */
>> 267 *(ptr++) = 0;
>> 268 *(ptr++) = 0;
>> 269
>> 270 /*
>> 271 * PC
>> 272 * use return address (RA), i.e. the moment after return from resume()
>> 273 */
>> 274 *(ptr++) = p->thread.reg31;
152 } 275 }
153 276
154 static int __kgdb_notify(struct die_args *args !! 277 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
155 { 278 {
156 /* cpu roundup */ !! 279 regs->cp0_epc = pc;
157 if (atomic_read(&kgdb_active) != -1) { !! 280 }
158 kgdb_nmicallback(smp_processor <<
159 return NOTIFY_STOP; <<
160 } <<
161 281
162 if (user_mode(args->regs)) !! 282 /*
>> 283 * Calls linux_debug_hook before the kernel dies. If KGDB is enabled,
>> 284 * then try to fall into the debugger
>> 285 */
>> 286 static int kgdb_mips_notify(struct notifier_block *self, unsigned long cmd,
>> 287 void *ptr)
>> 288 {
>> 289 struct die_args *args = (struct die_args *)ptr;
>> 290 struct pt_regs *regs = args->regs;
>> 291 int trap = (regs->cp0_cause & 0x7c) >> 2;
>> 292
>> 293 #ifdef CONFIG_KPROBES
>> 294 /*
>> 295 * Return immediately if the kprobes fault notifier has set
>> 296 * DIE_PAGE_FAULT.
>> 297 */
>> 298 if (cmd == DIE_PAGE_FAULT)
163 return NOTIFY_DONE; 299 return NOTIFY_DONE;
>> 300 #endif /* CONFIG_KPROBES */
>> 301
>> 302 /* Userspace events, ignore. */
>> 303 if (user_mode(regs))
>> 304 return NOTIFY_DONE;
>> 305
>> 306 if (atomic_read(&kgdb_active) != -1)
>> 307 kgdb_nmicallback(smp_processor_id(), regs);
164 308
165 if (kgdb_handle_exception(args->trapnr !! 309 if (kgdb_handle_exception(trap, compute_signal(trap), cmd, regs))
166 args->regs <<
167 return NOTIFY_DONE; 310 return NOTIFY_DONE;
168 311
>> 312 if (atomic_read(&kgdb_setting_breakpoint))
>> 313 if ((trap == 9) && (regs->cp0_epc == (unsigned long)breakinst))
>> 314 regs->cp0_epc += 4;
>> 315
>> 316 /* In SMP mode, __flush_cache_all does IPI */
>> 317 local_irq_enable();
>> 318 __flush_cache_all();
>> 319
169 return NOTIFY_STOP; 320 return NOTIFY_STOP;
170 } 321 }
171 322
172 static int !! 323 #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
173 kgdb_notify(struct notifier_block *self, unsig !! 324 int kgdb_ll_trap(int cmd, const char *str,
>> 325 struct pt_regs *regs, long err, int trap, int sig)
174 { 326 {
175 unsigned long flags; !! 327 struct die_args args = {
176 int ret; !! 328 .regs = regs,
>> 329 .str = str,
>> 330 .err = err,
>> 331 .trapnr = trap,
>> 332 .signr = sig,
>> 333
>> 334 };
177 335
178 local_irq_save(flags); !! 336 if (!kgdb_io_module_registered)
179 ret = __kgdb_notify(ptr, cmd); !! 337 return NOTIFY_DONE;
180 local_irq_restore(flags); <<
181 338
182 return ret; !! 339 return kgdb_mips_notify(NULL, cmd, &args);
183 } 340 }
>> 341 #endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
184 342
185 static struct notifier_block kgdb_notifier = { 343 static struct notifier_block kgdb_notifier = {
186 .notifier_call = kgdb_notify, !! 344 .notifier_call = kgdb_mips_notify,
187 <<
188 /* <<
189 * Lowest-prio notifier priority, we w <<
190 */ <<
191 .priority = -INT_MAX, <<
192 }; 345 };
193 346
194 /** !! 347 /*
195 * kgdb_arch_init - Perform any architecture s !! 348 * Handle the 'c' command
196 * <<
197 * This function will handle the initializatio <<
198 * specific callbacks. <<
199 */ 349 */
>> 350 int kgdb_arch_handle_exception(int vector, int signo, int err_code,
>> 351 char *remcom_in_buffer, char *remcom_out_buffer,
>> 352 struct pt_regs *regs)
>> 353 {
>> 354 char *ptr;
>> 355 unsigned long address;
>> 356
>> 357 switch (remcom_in_buffer[0]) {
>> 358 case 'c':
>> 359 /* handle the optional parameter */
>> 360 ptr = &remcom_in_buffer[1];
>> 361 if (kgdb_hex2long(&ptr, &address))
>> 362 regs->cp0_epc = address;
>> 363
>> 364 return 0;
>> 365 }
>> 366
>> 367 return -1;
>> 368 }
>> 369
>> 370 const struct kgdb_arch arch_kgdb_ops = {
>> 371 #ifdef CONFIG_CPU_BIG_ENDIAN
>> 372 .gdb_bpt_instr = { spec_op << 2, 0x00, 0x00, break_op },
>> 373 #else
>> 374 .gdb_bpt_instr = { break_op, 0x00, 0x00, spec_op << 2 },
>> 375 #endif
>> 376 };
>> 377
200 int kgdb_arch_init(void) 378 int kgdb_arch_init(void)
201 { 379 {
202 return register_die_notifier(&kgdb_not !! 380 register_die_notifier(&kgdb_notifier);
>> 381
>> 382 return 0;
203 } 383 }
204 384
205 /** !! 385 /*
206 * kgdb_arch_exit - Perform any architecture s !! 386 * kgdb_arch_exit - Perform any architecture specific uninitalization.
207 * 387 *
208 * This function will handle the uninitalizati !! 388 * This function will handle the uninitalization of any architecture
209 * specific callbacks, for dynamic registratio !! 389 * specific callbacks, for dynamic registration and unregistration.
210 */ 390 */
211 void kgdb_arch_exit(void) 391 void kgdb_arch_exit(void)
212 { 392 {
213 unregister_die_notifier(&kgdb_notifier 393 unregister_die_notifier(&kgdb_notifier);
214 } 394 }
215 395
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