kgdb_machdep.c revision 1.5
1 /* $NetBSD: kgdb_machdep.c,v 1.5 2002/02/19 17:22:34 uch Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1996 Matthias Pfaller. 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by Matthias Pfaller. 55 * 4. The name of the author may not be used to endorse or promote products 56 * derived from this software without specific prior written permission 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 59 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 60 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 61 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 62 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 63 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 64 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 65 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 66 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 67 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 68 */ 69 70 #include "opt_ddb.h" 71 #include "opt_kgdb.h" 72 73 #if defined(DDB) 74 #error "Can't build DDB and KGDB together." 75 #endif 76 77 /* 78 * Machine-dependent functions for remote KGDB. Originally written 79 * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386 80 * by Jason R. Thorpe. 81 */ 82 83 #include <sys/param.h> 84 #include <sys/kgdb.h> 85 #include <sys/systm.h> 86 87 #include <uvm/uvm_extern.h> 88 89 #include <machine/pte.h> 90 #include <machine/reg.h> 91 #include <machine/trap.h> 92 93 /* XXX Should be in <machine/pmap.h> */ 94 pt_entry_t *pmap_pte(pmap_t, vaddr_t); 95 96 /* 97 * Determine if the memory at va..(va+len) is valid. 98 */ 99 int 100 kgdb_acc(vaddr_t va, size_t len) 101 { 102 vaddr_t last_va; 103 pt_entry_t pte; 104 105 last_va = va + len; 106 va &= ~PGOFSET; 107 last_va &= ~PGOFSET; 108 109 do { 110 pte = *(pt_entry_t *)pmap_pte(pmap_kernel(), va); 111 if ((pte & PG_V) == 0) 112 return (0); 113 va += NBPG; 114 } while (va < last_va); 115 116 return (1); 117 } 118 119 /* 120 * Translate a trap number into a unix compatible signal value. 121 * (gdb only understands unix signal numbers). 122 */ 123 int 124 kgdb_signal(int type) 125 { 126 switch (type) { 127 case T_NMI: 128 return (SIGINT); 129 130 case T_ALIGNFLT: 131 return (SIGILL); 132 133 case T_BPTFLT: 134 case T_TRCTRAP: 135 return (SIGTRAP); 136 137 case T_ASTFLT: 138 case T_DOUBLEFLT: 139 return (SIGEMT); 140 141 case T_ARITHTRAP: 142 case T_DIVIDE: 143 case T_OFLOW: 144 case T_DNA: 145 case T_FPOPFLT: 146 return (SIGFPE); 147 148 case T_PRIVINFLT: 149 case T_PROTFLT: 150 case T_PAGEFLT: 151 case T_TSSFLT: 152 case T_SEGNPFLT: 153 case T_STKFLT: 154 return (SIGSEGV); 155 156 case T_BOUND: 157 return (SIGURG); 158 159 default: 160 return (SIGEMT); 161 } 162 } 163 164 /* 165 * Translate the values stored in the kernel regs struct to the format 166 * understood by gdb. 167 */ 168 void 169 kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) 170 { 171 172 gdb_regs[ 0] = regs->tf_eax; 173 gdb_regs[ 1] = regs->tf_ecx; 174 gdb_regs[ 2] = regs->tf_edx; 175 gdb_regs[ 3] = regs->tf_ebx; 176 gdb_regs[ 5] = regs->tf_ebp; 177 gdb_regs[ 6] = regs->tf_esi; 178 gdb_regs[ 7] = regs->tf_edi; 179 gdb_regs[ 8] = regs->tf_eip; 180 gdb_regs[ 9] = regs->tf_eflags; 181 gdb_regs[10] = regs->tf_cs; 182 gdb_regs[12] = regs->tf_ds; 183 gdb_regs[13] = regs->tf_es; 184 185 if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) { 186 /* 187 * Kernel mode - esp and ss not saved. 188 */ 189 gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack 190 pointer */ 191 __asm __volatile("movw %%ss,%w0" : "=r" (gdb_regs[11])); 192 } 193 } 194 195 /* 196 * Reverse the above. 197 */ 198 void 199 kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) 200 { 201 202 regs->tf_eax = gdb_regs[ 0]; 203 regs->tf_ecx = gdb_regs[ 1]; 204 regs->tf_edx = gdb_regs[ 2]; 205 regs->tf_ebx = gdb_regs[ 3]; 206 regs->tf_ebp = gdb_regs[ 5]; 207 regs->tf_esi = gdb_regs[ 6]; 208 regs->tf_edi = gdb_regs[ 7]; 209 regs->tf_eip = gdb_regs[ 8]; 210 regs->tf_eflags = gdb_regs[ 9]; 211 regs->tf_cs = gdb_regs[10]; 212 regs->tf_ds = gdb_regs[12]; 213 regs->tf_es = gdb_regs[13]; 214 215 if (KERNELMODE(regs->tf_cs, regs->tf_eflags) == 0) { 216 /* 217 * Trapped in user mode - restore esp and ss. 218 */ 219 regs->tf_esp = gdb_regs[ 4]; 220 regs->tf_ss = gdb_regs[11]; 221 } 222 } 223 224 /* 225 * Trap into kgdb to wait for debugger to connect, 226 * noting on the console why nothing else is going on. 227 */ 228 void 229 kgdb_connect(int verbose) 230 { 231 232 if (kgdb_dev < 0) 233 return; 234 235 if (verbose) 236 printf("kgdb waiting..."); 237 238 __asm__ __volatile__("trapa #0xc3"); 239 240 if (verbose) 241 printf("connected.\n"); 242 243 kgdb_debug_panic = 1; 244 } 245 246 /* 247 * Decide what to do on panic. 248 * (This is called by panic, like Debugger()) 249 */ 250 void 251 kgdb_panic() 252 { 253 if (kgdb_dev >= 0 && kgdb_debug_panic) { 254 printf("entering kgdb\n"); 255 kgdb_connect(kgdb_active == 0); 256 } 257 } 258
Indexes created Wed Oct 29 20:09:47 GMT 2025