1 /* $NetBSD: kgdb_machdep.c,v 1.6 2022/08/22 13:57:24 hannken Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 2017 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 1.6 2022/08/22 13:57:24 hannken Exp $"); 60 61 #include "opt_ddb.h" 62 63 /* 64 * Machine-dependent functions for remote KGDB. Originally written 65 * for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386 66 * by Jason R. Thorpe. Modified for NetBSD/amd64 by Frank van der Linden. 67 */ 68 69 #include <sys/param.h> 70 #include <sys/kgdb.h> 71 #include <sys/systm.h> 72 73 #include <machine/pmap_private.h> 74 #include <machine/pte.h> 75 #include <machine/trap.h> 76 77 /* 78 * Determine if the memory at va..(va+len) is valid. 79 */ 80 int 81 kgdb_acc(vaddr_t va, size_t len) 82 { 83 vaddr_t last_va; 84 pt_entry_t *pte; 85 86 last_va = va + len; 87 va &= ~PGOFSET; 88 last_va &= ~PGOFSET; 89 90 do { 91 if (va < VM_MIN_KERNEL_ADDRESS) 92 pte = vtopte(va); 93 else 94 pte = kvtopte(va); 95 if ((*pte & PTE_P) == 0) 96 return 0; 97 if (*pte & PTE_PS) 98 va = (va & PTE_LGFRAME) + NBPD_L2; 99 else 100 va += PAGE_SIZE; 101 } while (va < last_va); 102 103 return 1; 104 } 105 106 void 107 kgdb_entry_notice(int type, db_regs_t *regs) 108 { 109 if (type == T_NMI) 110 printf("NMI ... going to debugger\n"); 111 } 112 113 /* 114 * Translate a trap number into a unix compatible signal value. 115 * (gdb only understands unix signal numbers). 116 */ 117 int 118 kgdb_signal(int type) 119 { 120 switch (type) { 121 case T_NMI: 122 return SIGINT; 123 124 case T_ALIGNFLT: 125 return SIGILL; 126 127 case T_BPTFLT: 128 case T_TRCTRAP: 129 return SIGTRAP; 130 131 case T_ASTFLT: 132 case T_DOUBLEFLT: 133 return SIGEMT; 134 135 case T_ARITHTRAP: 136 case T_DIVIDE: 137 case T_OFLOW: 138 case T_DNA: 139 case T_FPOPFLT: 140 return SIGFPE; 141 142 case T_PRIVINFLT: 143 case T_PROTFLT: 144 case T_PAGEFLT: 145 case T_TSSFLT: 146 case T_SEGNPFLT: 147 case T_STKFLT: 148 return SIGSEGV; 149 150 case T_BOUND: 151 return SIGURG; 152 153 default: 154 return SIGEMT; 155 } 156 } 157 158 /* 159 * Translate the values stored in the kernel regs struct to the format 160 * understood by gdb. 161 */ 162 void 163 kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) 164 { 165 #ifdef __x86_64__ 166 gdb_regs[ 0] = regs->tf_rax; 167 gdb_regs[ 1] = regs->tf_rbx; 168 gdb_regs[ 2] = regs->tf_rcx; 169 gdb_regs[ 3] = regs->tf_rdx; 170 gdb_regs[ 4] = regs->tf_rsi; 171 gdb_regs[ 5] = regs->tf_rdi; 172 gdb_regs[ 6] = regs->tf_rbp; 173 gdb_regs[ 7] = regs->tf_rsp; 174 gdb_regs[ 8] = regs->tf_r8; 175 gdb_regs[ 9] = regs->tf_r9; 176 gdb_regs[10] = regs->tf_r10; 177 gdb_regs[11] = regs->tf_r11; 178 gdb_regs[12] = regs->tf_r12; 179 gdb_regs[13] = regs->tf_r13; 180 gdb_regs[14] = regs->tf_r14; 181 gdb_regs[15] = regs->tf_r15; 182 gdb_regs[16] = regs->tf_rip; 183 gdb_regs[17] = regs->tf_rflags; 184 gdb_regs[18] = regs->tf_cs; 185 gdb_regs[19] = regs->tf_ss; 186 #else 187 gdb_regs[ 0] = regs->tf_eax; 188 gdb_regs[ 1] = regs->tf_ecx; 189 gdb_regs[ 2] = regs->tf_edx; 190 gdb_regs[ 3] = regs->tf_ebx; 191 gdb_regs[ 5] = regs->tf_ebp; 192 gdb_regs[ 6] = regs->tf_esi; 193 gdb_regs[ 7] = regs->tf_edi; 194 gdb_regs[ 8] = regs->tf_eip; 195 gdb_regs[ 9] = regs->tf_eflags; 196 gdb_regs[10] = regs->tf_cs; 197 gdb_regs[12] = regs->tf_ds; 198 gdb_regs[13] = regs->tf_es; 199 gdb_regs[14] = regs->tf_fs; 200 gdb_regs[15] = regs->tf_gs; 201 202 if (KERNELMODE(regs->tf_cs)) { 203 /* 204 * Kernel mode - esp and ss not saved. 205 */ 206 gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack 207 pointer */ 208 gdb_regs[11] = x86_getss(); 209 } 210 #endif 211 } 212 213 /* 214 * Reverse the above. 215 */ 216 void 217 kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs) 218 { 219 #ifdef __x86_64__ 220 regs->tf_rax = gdb_regs[ 0]; 221 regs->tf_rbx = gdb_regs[ 1]; 222 regs->tf_rcx = gdb_regs[ 2]; 223 regs->tf_rdx = gdb_regs[ 3]; 224 regs->tf_rsi = gdb_regs[ 4]; 225 regs->tf_rdi = gdb_regs[ 5]; 226 regs->tf_rbp = gdb_regs[ 6]; 227 regs->tf_rsp = gdb_regs[ 7]; 228 regs->tf_r8 = gdb_regs[ 8]; 229 regs->tf_r9 = gdb_regs[ 9]; 230 regs->tf_r10 = gdb_regs[10]; 231 regs->tf_r11 = gdb_regs[11]; 232 regs->tf_r12 = gdb_regs[12]; 233 regs->tf_r13 = gdb_regs[13]; 234 regs->tf_r14 = gdb_regs[14]; 235 regs->tf_r15 = gdb_regs[15]; 236 regs->tf_rip = gdb_regs[16]; 237 regs->tf_rflags = gdb_regs[17]; 238 regs->tf_cs = gdb_regs[18]; 239 regs->tf_ss = gdb_regs[19]; 240 #else 241 regs->tf_eax = gdb_regs[ 0]; 242 regs->tf_ecx = gdb_regs[ 1]; 243 regs->tf_edx = gdb_regs[ 2]; 244 regs->tf_ebx = gdb_regs[ 3]; 245 regs->tf_ebp = gdb_regs[ 5]; 246 regs->tf_esi = gdb_regs[ 6]; 247 regs->tf_edi = gdb_regs[ 7]; 248 regs->tf_eip = gdb_regs[ 8]; 249 regs->tf_eflags = gdb_regs[ 9]; 250 regs->tf_cs = gdb_regs[10]; 251 regs->tf_ds = gdb_regs[12]; 252 regs->tf_es = gdb_regs[13]; 253 254 if (KERNELMODE(regs->tf_cs) == 0) { 255 /* 256 * Trapped in user mode - restore esp and ss. 257 */ 258 regs->tf_esp = gdb_regs[ 4]; 259 regs->tf_ss = gdb_regs[11]; 260 } 261 #endif 262 } 263 264 /* 265 * Trap into kgdb to wait for debugger to connect, 266 * noting on the console why nothing else is going on. 267 */ 268 void 269 kgdb_connect(int verbose) 270 { 271 if (kgdb_dev == NODEV) 272 return; 273 274 if (verbose) 275 printf("kgdb waiting..."); 276 277 breakpoint(); 278 279 if (verbose) 280 printf("connected.\n"); 281 282 kgdb_debug_panic = 1; 283 } 284 285 /* 286 * Decide what to do on panic. 287 * (This is called by panic, like Debugger()) 288 */ 289 void 290 kgdb_panic(void) 291 { 292 if (kgdb_dev != NODEV && kgdb_debug_panic) { 293 printf("entering kgdb\n"); 294 kgdb_connect(kgdb_active == 0); 295 } 296 } 297
Indexes created Sat Sep 20 22:09:52 GMT 2025