1 /* $NetBSD: kgdb_machdep.c,v 1.17 2009/11/21 17:40:28 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1996 Matthias Pfaller. 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 47 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 49 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 50 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 51 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 52 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 53 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 54 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 55 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 56 */ 57 58 #include <sys/cdefs.h> 59 __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.17 2009/11/21 17:40:28 rmind Exp $"); 60 61 #include "opt_ddb.h" 62 63 #if defined(DDB) 64 #error "Can't build DDB and KGDB together." 65 #endif 66 67 /* 68 * Machine-dependent functions for remote KGDB. Originally written 69 * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386 70 * by Jason R. Thorpe. Modified for NetBSD/mips by Ethan Solomita. 71 * Modified for NetBSD/sh3 by UCHIYAMA Yasushi. 72 */ 73 74 #include <sys/types.h> 75 #include <sys/systm.h> 76 #include <sys/param.h> 77 #include <sys/proc.h> 78 #include <sys/reboot.h> 79 #include <sys/kgdb.h> 80 81 #include <uvm/uvm_extern.h> 82 83 #include <sh3/cpu.h> 84 85 #include <machine/db_machdep.h> 86 #include <ddb/db_access.h> 87 88 /* 89 * Is kva a valid address to access? This is used by KGDB. 90 */ 91 static int 92 kvacc(vaddr_t kva) 93 { 94 pt_entry_t *pte; 95 96 if (kva < SH3_P1SEG_BASE) 97 return (0); 98 99 if (kva < SH3_P2SEG_BASE) 100 return (1); 101 102 if (kva >= VM_MAX_KERNEL_ADDRESS) 103 return (0); 104 105 /* check kva is kernel virtual. */ 106 if ((kva < VM_MIN_KERNEL_ADDRESS) || 107 (kva >= VM_MAX_KERNEL_ADDRESS)) 108 return (0); 109 110 /* check page which related kva is valid. */ 111 pte = __pmap_kpte_lookup(kva); 112 if (!(*pte & PG_V)) 113 return (0); 114 115 return (1); 116 } 117 118 /* 119 * Determine if the memory at va..(va+len) is valid. 120 */ 121 int 122 kgdb_acc(vaddr_t va, size_t len) 123 { 124 vaddr_t last_va; 125 126 last_va = va + len + PAGE_SIZE - 1; 127 va &= ~PGOFSET; 128 last_va &= ~PGOFSET; 129 130 for (; va < last_va; va += PAGE_SIZE) { 131 if (kvacc(va) == 0) 132 return 0; 133 } 134 135 return (1); 136 } 137 138 /* 139 * Translate a trap number into a unix compatible signal value. 140 * (gdb only understands unix signal numbers). 141 */ 142 int 143 kgdb_signal(int type) 144 { 145 146 switch (type) { 147 case EXPEVT_TLB_MISS_LD: 148 case EXPEVT_TLB_MISS_ST: 149 case EXPEVT_TLB_MOD: 150 case EXPEVT_TLB_PROT_LD: 151 case EXPEVT_TLB_PROT_ST: 152 case EXPEVT_ADDR_ERR_LD: 153 case EXPEVT_ADDR_ERR_ST: 154 case EXPEVT_TLB_MISS_LD | EXP_USER: 155 case EXPEVT_TLB_MISS_ST | EXP_USER: 156 case EXPEVT_TLB_MOD | EXP_USER: 157 case EXPEVT_TLB_PROT_LD | EXP_USER: 158 case EXPEVT_TLB_PROT_ST | EXP_USER: 159 case EXPEVT_ADDR_ERR_LD | EXP_USER: 160 case EXPEVT_ADDR_ERR_ST | EXP_USER: 161 return (SIGSEGV); 162 163 case EXPEVT_TRAPA: 164 case EXPEVT_BREAK: 165 case EXPEVT_TRAPA | EXP_USER: 166 case EXPEVT_BREAK | EXP_USER: 167 return (SIGTRAP); 168 169 case EXPEVT_RES_INST: 170 case EXPEVT_SLOT_INST: 171 case EXPEVT_RES_INST | EXP_USER: 172 case EXPEVT_SLOT_INST | EXP_USER: 173 return (SIGILL); 174 175 default: 176 return (SIGEMT); 177 } 178 } 179 180 /* 181 * Translate the values stored in the db_regs_t struct to the format 182 * understood by gdb. (gdb-5.1.1/gdb/config/sh/tm-sh.h) 183 */ 184 void 185 kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) 186 { 187 uint32_t r; 188 189 memset(gdb_regs, 0, KGDB_NUMREGS * sizeof(kgdb_reg_t)); 190 gdb_regs[ 0] = regs->tf_r0; 191 gdb_regs[ 1] = regs->tf_r1; 192 gdb_regs[ 2] = regs->tf_r2; 193 gdb_regs[ 3] = regs->tf_r3; 194 gdb_regs[ 4] = regs->tf_r4; 195 gdb_regs[ 5] = regs->tf_r5; 196 gdb_regs[ 6] = regs->tf_r6; 197 gdb_regs[ 7] = regs->tf_r7; 198 gdb_regs[ 8] = regs->tf_r8; 199 gdb_regs[ 9] = regs->tf_r9; 200 gdb_regs[10] = regs->tf_r10; 201 gdb_regs[11] = regs->tf_r11; 202 gdb_regs[12] = regs->tf_r12; 203 gdb_regs[13] = regs->tf_r13; 204 gdb_regs[14] = regs->tf_r14; 205 gdb_regs[15] = regs->tf_r15; 206 gdb_regs[16] = regs->tf_spc; 207 gdb_regs[17] = regs->tf_pr; 208 __asm volatile("stc vbr, %0" : "=r"(r)); 209 gdb_regs[19] = r; 210 gdb_regs[20] = regs->tf_mach; 211 gdb_regs[21] = regs->tf_macl; 212 gdb_regs[22] = regs->tf_ssr; 213 214 /* How treat register bank 1 ? */ 215 } 216 217 /* 218 * Reverse the above. 219 */ 220 void 221 kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) 222 { 223 224 regs->tf_r0 = gdb_regs[ 0]; 225 regs->tf_r1 = gdb_regs[ 1]; 226 regs->tf_r2 = gdb_regs[ 2]; 227 regs->tf_r3 = gdb_regs[ 3]; 228 regs->tf_r4 = gdb_regs[ 4]; 229 regs->tf_r5 = gdb_regs[ 5]; 230 regs->tf_r6 = gdb_regs[ 6]; 231 regs->tf_r7 = gdb_regs[ 7]; 232 regs->tf_r8 = gdb_regs[ 8]; 233 regs->tf_r9 = gdb_regs[ 9]; 234 regs->tf_r10 = gdb_regs[10]; 235 regs->tf_r11 = gdb_regs[11]; 236 regs->tf_r12 = gdb_regs[12]; 237 regs->tf_r13 = gdb_regs[13]; 238 regs->tf_r14 = gdb_regs[14]; 239 regs->tf_r15 = gdb_regs[15]; 240 regs->tf_spc = gdb_regs[16]; 241 regs->tf_pr = gdb_regs[17]; 242 __asm volatile("ldc %0, vbr" :: "r"(gdb_regs[19])); 243 regs->tf_mach = gdb_regs[20]; 244 regs->tf_macl = gdb_regs[21]; 245 regs->tf_ssr = gdb_regs[22]; 246 } 247 248 /* 249 * Trap into kgdb to wait for debugger to connect, 250 * noting on the console why nothing else is going on. 251 */ 252 void 253 kgdb_connect(int verbose) 254 { 255 256 if (kgdb_dev == NODEV) { 257 printf("kgdb_dev=%"PRId64"\n", kgdb_dev); 258 return; 259 } 260 261 if (verbose) 262 printf("kgdb waiting..."); 263 264 __asm volatile("trapa %0" :: "i"(_SH_TRA_BREAK)); 265 266 if (verbose) 267 printf("connected.\n"); 268 269 kgdb_debug_panic = 1; 270 } 271 272 /* 273 * Decide what to do on panic. 274 * (This is called by panic, like Debugger()) 275 */ 276 void 277 kgdb_panic(void) 278 { 279 280 if (kgdb_dev != NODEV && kgdb_debug_panic) { 281 printf("entering kgdb\n"); 282 kgdb_connect(kgdb_active == 0); 283 } 284 } 285