kgdb_machdep.c revision 1.2
1 /* $NetBSD: kgdb_machdep.c,v 1.2 2000/06/29 07:44:04 mrg 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 #if defined(DDB) 71 #error "Can't build DDB and KGDB together." 72 #endif 73 74 /* 75 * Machine-dependent functions for remote KGDB. Originally written 76 * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386 77 * by Jason R. Thorpe. 78 */ 79 80 #include <sys/param.h> 81 #include <sys/kgdb.h> 82 #include <sys/systm.h> 83 84 #include <uvm/uvm_extern.h> 85 86 #include <machine/pte.h> 87 #include <machine/reg.h> 88 #include <machine/trap.h> 89 90 /* XXX Should be in <machine/pmap.h> */ 91 pt_entry_t *pmap_pte __P((pmap_t, vaddr_t)); 92 93 /* 94 * Determine if the memory at va..(va+len) is valid. 95 */ 96 int 97 kgdb_acc(va, len) 98 vaddr_t va; 99 size_t len; 100 { 101 vaddr_t last_va; 102 pt_entry_t pte; 103 104 last_va = va + len; 105 va &= ~PGOFSET; 106 last_va &= ~PGOFSET; 107 108 do { 109 pte = *(pt_entry_t *)pmap_pte(pmap_kernel(), va); 110 if ((pte & PG_V) == 0) 111 return (0); 112 va += NBPG; 113 } while (va < last_va); 114 115 return (1); 116 } 117 118 /* 119 * Translate a trap number into a unix compatible signal value. 120 * (gdb only understands unix signal numbers). 121 */ 122 int 123 kgdb_signal(type) 124 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(regs, gdb_regs) 170 db_regs_t *regs; 171 kgdb_reg_t *gdb_regs; 172 { 173 174 gdb_regs[ 0] = regs->tf_eax; 175 gdb_regs[ 1] = regs->tf_ecx; 176 gdb_regs[ 2] = regs->tf_edx; 177 gdb_regs[ 3] = regs->tf_ebx; 178 gdb_regs[ 5] = regs->tf_ebp; 179 gdb_regs[ 6] = regs->tf_esi; 180 gdb_regs[ 7] = regs->tf_edi; 181 gdb_regs[ 8] = regs->tf_eip; 182 gdb_regs[ 9] = regs->tf_eflags; 183 gdb_regs[10] = regs->tf_cs; 184 gdb_regs[12] = regs->tf_ds; 185 gdb_regs[13] = regs->tf_es; 186 187 if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) { 188 /* 189 * Kernel mode - esp and ss not saved. 190 */ 191 gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack 192 pointer */ 193 __asm __volatile("movw %%ss,%w0" : "=r" (gdb_regs[11])); 194 } 195 } 196 197 /* 198 * Reverse the above. 199 */ 200 void 201 kgdb_setregs(regs, gdb_regs) 202 db_regs_t *regs; 203 kgdb_reg_t *gdb_regs; 204 { 205 206 regs->tf_eax = gdb_regs[ 0]; 207 regs->tf_ecx = gdb_regs[ 1]; 208 regs->tf_edx = gdb_regs[ 2]; 209 regs->tf_ebx = gdb_regs[ 3]; 210 regs->tf_ebp = gdb_regs[ 5]; 211 regs->tf_esi = gdb_regs[ 6]; 212 regs->tf_edi = gdb_regs[ 7]; 213 regs->tf_eip = gdb_regs[ 8]; 214 regs->tf_eflags = gdb_regs[ 9]; 215 regs->tf_cs = gdb_regs[10]; 216 regs->tf_ds = gdb_regs[12]; 217 regs->tf_es = gdb_regs[13]; 218 219 if (KERNELMODE(regs->tf_cs, regs->tf_eflags) == 0) { 220 /* 221 * Trapped in user mode - restore esp and ss. 222 */ 223 regs->tf_esp = gdb_regs[ 4]; 224 regs->tf_ss = gdb_regs[11]; 225 } 226 } 227 228 /* 229 * Trap into kgdb to wait for debugger to connect, 230 * noting on the console why nothing else is going on. 231 */ 232 void 233 kgdb_connect(verbose) 234 int verbose; 235 { 236 237 if (kgdb_dev < 0) 238 return; 239 240 if (verbose) 241 printf("kgdb waiting..."); 242 243 breakpoint(); 244 245 if (verbose) 246 printf("connected.\n"); 247 248 kgdb_debug_panic = 1; 249 } 250 251 /* 252 * Decide what to do on panic. 253 * (This is called by panic, like Debugger()) 254 */ 255 void 256 kgdb_panic() 257 { 258 if (kgdb_dev >= 0 && kgdb_debug_panic) { 259 printf("entering kgdb\n"); 260 kgdb_connect(kgdb_active == 0); 261 } 262 } 263
Indexes created Sat Oct 25 16:10:12 GMT 2025