Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/gdb/gdb_main.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
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1 /*- 2 * Copyright (c) 2004 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/kdb.h> 33 #include <sys/kernel.h> 34 #include <sys/pcpu.h> 35 #include <sys/proc.h> 36 #include <sys/reboot.h> 37 38 #include <machine/gdb_machdep.h> 39 #include <machine/kdb.h> 40 41 #include <gdb/gdb.h> 42 #include <gdb/gdb_int.h> 43 44 static dbbe_init_f gdb_init; 45 static dbbe_trap_f gdb_trap; 46 47 KDB_BACKEND(gdb, gdb_init, NULL, gdb_trap); 48 49 GDB_DBGPORT(null, NULL, NULL, NULL, NULL, NULL, NULL); 50 SET_DECLARE(gdb_dbgport_set, struct gdb_dbgport); 51 52 struct gdb_dbgport *gdb_cur = NULL; 53 54 static int 55 gdb_init(void) 56 { 57 struct gdb_dbgport *dp, **iter; 58 int cur_pri, pri; 59 60 gdb_cur = NULL; 61 cur_pri = -1; 62 SET_FOREACH(iter, gdb_dbgport_set) { 63 dp = *iter; 64 pri = (dp->gdb_probe != NULL) ? dp->gdb_probe() : -1; 65 dp->gdb_active = (pri >= 0) ? 0 : -1; 66 if (pri > cur_pri) { 67 cur_pri = pri; 68 gdb_cur = dp; 69 } 70 } 71 if (gdb_cur != NULL) { 72 printf("GDB: debug ports:"); 73 SET_FOREACH(iter, gdb_dbgport_set) { 74 dp = *iter; 75 if (dp->gdb_active == 0) 76 printf(" %s", dp->gdb_name); 77 } 78 printf("\n"); 79 } else 80 printf("GDB: no debug ports present\n"); 81 if (gdb_cur != NULL) { 82 gdb_cur->gdb_init(); 83 printf("GDB: current port: %s\n", gdb_cur->gdb_name); 84 } 85 if (gdb_cur != NULL) 86 cur_pri = (boothowto & RB_GDB) ? 2 : 0; 87 else 88 cur_pri = -1; 89 return (cur_pri); 90 } 91 92 static int 93 gdb_trap(int type, int code) 94 { 95 struct thread *thr_iter; 96 97 /* 98 * Send a T packet. We currently do not support watchpoints (the 99 * awatch, rwatch or watch elements). 100 */ 101 gdb_tx_begin('T'); 102 gdb_tx_hex(gdb_cpu_signal(type, code), 2); 103 gdb_tx_varhex(GDB_REG_PC); 104 gdb_tx_char(':'); 105 gdb_tx_reg(GDB_REG_PC); 106 gdb_tx_char(';'); 107 gdb_tx_str("thread:"); 108 gdb_tx_varhex((long)kdb_thread->td_tid); 109 gdb_tx_char(';'); 110 gdb_tx_end(); /* XXX check error condition. */ 111 112 thr_iter = NULL; 113 while (gdb_rx_begin() == 0) { 114 /* printf("GDB: got '%s'\n", gdb_rxp); */ 115 switch (gdb_rx_char()) { 116 case '?': /* Last signal. */ 117 gdb_tx_begin('S'); 118 gdb_tx_hex(gdb_cpu_signal(type, code), 2); 119 gdb_tx_end(); 120 break; 121 case 'c': { /* Continue. */ 122 uintmax_t addr; 123 register_t pc; 124 if (!gdb_rx_varhex(&addr)) { 125 pc = addr; 126 gdb_cpu_setreg(GDB_REG_PC, &pc); 127 } 128 kdb_cpu_clear_singlestep(); 129 return (1); 130 } 131 case 'C': { /* Continue with signal. */ 132 uintmax_t addr, sig; 133 register_t pc; 134 if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' && 135 !gdb_rx_varhex(&addr)) { 136 pc = addr; 137 gdb_cpu_setreg(GDB_REG_PC, &pc); 138 } 139 kdb_cpu_clear_singlestep(); 140 return (1); 141 } 142 case 'D': { /* Detach */ 143 gdb_tx_ok(); 144 kdb_cpu_clear_singlestep(); 145 return (1); 146 } 147 case 'g': { /* Read registers. */ 148 size_t r; 149 gdb_tx_begin(0); 150 for (r = 0; r < GDB_NREGS; r++) 151 gdb_tx_reg(r); 152 gdb_tx_end(); 153 break; 154 } 155 case 'G': /* Write registers. */ 156 gdb_tx_err(0); 157 break; 158 case 'H': { /* Set thread. */ 159 intmax_t tid; 160 struct thread *thr; 161 gdb_rx_char(); 162 if (gdb_rx_varhex(&tid)) { 163 gdb_tx_err(EINVAL); 164 break; 165 } 166 if (tid > 0) { 167 thr = kdb_thr_lookup(tid); 168 if (thr == NULL) { 169 gdb_tx_err(ENOENT); 170 break; 171 } 172 kdb_thr_select(thr); 173 } 174 gdb_tx_ok(); 175 break; 176 } 177 case 'k': /* Kill request. */ 178 kdb_cpu_clear_singlestep(); 179 return (1); 180 case 'm': { /* Read memory. */ 181 uintmax_t addr, size; 182 if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' || 183 gdb_rx_varhex(&size)) { 184 gdb_tx_err(EINVAL); 185 break; 186 } 187 gdb_tx_begin(0); 188 if (gdb_tx_mem((char *)(uintptr_t)addr, size)) 189 gdb_tx_end(); 190 else 191 gdb_tx_err(EIO); 192 break; 193 } 194 case 'M': { /* Write memory. */ 195 uintmax_t addr, size; 196 if (gdb_rx_varhex(&addr) || gdb_rx_char() != ',' || 197 gdb_rx_varhex(&size) || gdb_rx_char() != ':') { 198 gdb_tx_err(EINVAL); 199 break; 200 } 201 if (gdb_rx_mem((char *)(uintptr_t)addr, size) == 0) 202 gdb_tx_err(EIO); 203 else 204 gdb_tx_ok(); 205 break; 206 } 207 case 'P': { /* Write register. */ 208 char *val; 209 uintmax_t reg; 210 val = gdb_rxp; 211 if (gdb_rx_varhex(®) || gdb_rx_char() != '=' || 212 !gdb_rx_mem(val, gdb_cpu_regsz(reg))) { 213 gdb_tx_err(EINVAL); 214 break; 215 } 216 gdb_cpu_setreg(reg, val); 217 gdb_tx_ok(); 218 break; 219 } 220 case 'q': /* General query. */ 221 if (gdb_rx_equal("fThreadInfo")) { 222 thr_iter = kdb_thr_first(); 223 gdb_tx_begin('m'); 224 gdb_tx_hex((long)thr_iter->td_tid, 8); 225 gdb_tx_end(); 226 } else if (gdb_rx_equal("sThreadInfo")) { 227 if (thr_iter == NULL) { 228 gdb_tx_err(ENXIO); 229 break; 230 } 231 thr_iter = kdb_thr_next(thr_iter); 232 if (thr_iter != NULL) { 233 gdb_tx_begin('m'); 234 gdb_tx_hex((long)thr_iter->td_tid, 8); 235 gdb_tx_end(); 236 } else { 237 gdb_tx_begin('l'); 238 gdb_tx_end(); 239 } 240 } else if (!gdb_cpu_query()) 241 gdb_tx_empty(); 242 break; 243 case 's': { /* Step. */ 244 uintmax_t addr; 245 register_t pc; 246 if (!gdb_rx_varhex(&addr)) { 247 pc = addr; 248 gdb_cpu_setreg(GDB_REG_PC, &pc); 249 } 250 kdb_cpu_set_singlestep(); 251 return (1); 252 } 253 case 'S': { /* Step with signal. */ 254 uintmax_t addr, sig; 255 register_t pc; 256 if (!gdb_rx_varhex(&sig) && gdb_rx_char() == ';' && 257 !gdb_rx_varhex(&addr)) { 258 pc = addr; 259 gdb_cpu_setreg(GDB_REG_PC, &pc); 260 } 261 kdb_cpu_set_singlestep(); 262 return (1); 263 } 264 case 'T': { /* Thread alive. */ 265 intmax_t tid; 266 if (gdb_rx_varhex(&tid)) { 267 gdb_tx_err(EINVAL); 268 break; 269 } 270 if (kdb_thr_lookup(tid) != NULL) 271 gdb_tx_ok(); 272 else 273 gdb_tx_err(ENOENT); 274 break; 275 } 276 case -1: 277 /* Empty command. Treat as unknown command. */ 278 /* FALLTHROUGH */ 279 default: 280 /* Unknown command. Send empty response. */ 281 gdb_tx_empty(); 282 break; 283 } 284 } 285 return (0); 286 }
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