1 /* $FreeBSD$ */ 2 /* $NetBSD: db_trace.c,v 1.20 2002/05/13 20:30:09 matt Exp $ */ 3 /* $OpenBSD: db_trace.c,v 1.3 1997/03/21 02:10:48 niklas Exp $ */ 4 5 /*- 6 * Mach Operating System 7 * Copyright (c) 1992 Carnegie Mellon University 8 * All Rights Reserved. 9 * 10 * Permission to use, copy, modify and distribute this software and its 11 * documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 18 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie Mellon 28 * the rights to redistribute these changes. 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kdb.h> 34 #include <sys/proc.h> 35 #include <sys/stack.h> 36 37 #include <vm/vm.h> 38 #include <vm/pmap.h> 39 #include <vm/vm_extern.h> 40 41 #include <machine/db_machdep.h> 42 #include <machine/pcb.h> 43 #include <machine/spr.h> 44 #include <machine/stack.h> 45 #include <machine/trap.h> 46 47 #include <ddb/ddb.h> 48 #include <ddb/db_access.h> 49 #include <ddb/db_sym.h> 50 #include <ddb/db_variables.h> 51 52 static db_varfcn_t db_frame; 53 54 #define DB_OFFSET(x) (db_expr_t *)offsetof(struct trapframe, x) 55 56 struct db_variable db_regs[] = { 57 { "r0", DB_OFFSET(fixreg[0]), db_frame }, 58 { "r1", DB_OFFSET(fixreg[1]), db_frame }, 59 { "r2", DB_OFFSET(fixreg[2]), db_frame }, 60 { "r3", DB_OFFSET(fixreg[3]), db_frame }, 61 { "r4", DB_OFFSET(fixreg[4]), db_frame }, 62 { "r5", DB_OFFSET(fixreg[5]), db_frame }, 63 { "r6", DB_OFFSET(fixreg[6]), db_frame }, 64 { "r7", DB_OFFSET(fixreg[7]), db_frame }, 65 { "r8", DB_OFFSET(fixreg[8]), db_frame }, 66 { "r9", DB_OFFSET(fixreg[9]), db_frame }, 67 { "r10", DB_OFFSET(fixreg[10]), db_frame }, 68 { "r11", DB_OFFSET(fixreg[11]), db_frame }, 69 { "r12", DB_OFFSET(fixreg[12]), db_frame }, 70 { "r13", DB_OFFSET(fixreg[13]), db_frame }, 71 { "r14", DB_OFFSET(fixreg[14]), db_frame }, 72 { "r15", DB_OFFSET(fixreg[15]), db_frame }, 73 { "r16", DB_OFFSET(fixreg[16]), db_frame }, 74 { "r17", DB_OFFSET(fixreg[17]), db_frame }, 75 { "r18", DB_OFFSET(fixreg[18]), db_frame }, 76 { "r19", DB_OFFSET(fixreg[19]), db_frame }, 77 { "r20", DB_OFFSET(fixreg[20]), db_frame }, 78 { "r21", DB_OFFSET(fixreg[21]), db_frame }, 79 { "r22", DB_OFFSET(fixreg[22]), db_frame }, 80 { "r23", DB_OFFSET(fixreg[23]), db_frame }, 81 { "r24", DB_OFFSET(fixreg[24]), db_frame }, 82 { "r25", DB_OFFSET(fixreg[25]), db_frame }, 83 { "r26", DB_OFFSET(fixreg[26]), db_frame }, 84 { "r27", DB_OFFSET(fixreg[27]), db_frame }, 85 { "r28", DB_OFFSET(fixreg[28]), db_frame }, 86 { "r29", DB_OFFSET(fixreg[29]), db_frame }, 87 { "r30", DB_OFFSET(fixreg[30]), db_frame }, 88 { "r31", DB_OFFSET(fixreg[31]), db_frame }, 89 { "srr0", DB_OFFSET(srr0), db_frame }, 90 { "srr1", DB_OFFSET(srr1), db_frame }, 91 { "lr", DB_OFFSET(lr), db_frame }, 92 { "ctr", DB_OFFSET(ctr), db_frame }, 93 { "cr", DB_OFFSET(cr), db_frame }, 94 { "xer", DB_OFFSET(xer), db_frame }, 95 #ifdef AIM 96 { "dar", DB_OFFSET(cpu.aim.dar), db_frame }, 97 { "dsisr", DB_OFFSET(cpu.aim.dsisr), db_frame }, 98 #endif 99 #ifdef E500 100 { "dear", DB_OFFSET(cpu.booke.dear), db_frame }, 101 { "esr", DB_OFFSET(cpu.booke.esr), db_frame }, 102 #endif 103 }; 104 struct db_variable *db_eregs = db_regs + sizeof (db_regs)/sizeof (db_regs[0]); 105 106 /* 107 * register variable handling 108 */ 109 static int 110 db_frame(struct db_variable *vp, db_expr_t *valuep, int op) 111 { 112 uint32_t *reg; 113 114 if (kdb_frame == NULL) 115 return (0); 116 reg = (uint32_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep); 117 if (op == DB_VAR_GET) 118 *valuep = *reg; 119 else 120 *reg = *valuep; 121 return (1); 122 } 123 124 125 /* 126 * Frame tracing. 127 */ 128 static int 129 db_backtrace(struct thread *td, db_addr_t fp, int count) 130 { 131 db_addr_t stackframe, lr, *args; 132 db_expr_t diff; 133 c_db_sym_t sym; 134 const char *symname; 135 boolean_t kernel_only = TRUE; 136 boolean_t full = FALSE; 137 138 #if 0 139 { 140 register char *cp = modif; 141 register char c; 142 143 while ((c = *cp++) != 0) { 144 if (c == 't') 145 trace_thread = TRUE; 146 if (c == 'u') 147 kernel_only = FALSE; 148 if (c == 'f') 149 full = TRUE; 150 } 151 } 152 #endif 153 154 stackframe = fp; 155 156 while (!db_pager_quit) { 157 if (stackframe < PAGE_SIZE) 158 break; 159 160 /* 161 * Locate the next frame by grabbing the backchain ptr 162 * from frame[0] 163 */ 164 stackframe = *(db_addr_t *)stackframe; 165 166 next_frame: 167 /* The saved arg values start at frame[2] */ 168 args = (db_addr_t *)(stackframe + 8); 169 170 if (stackframe < PAGE_SIZE) 171 break; 172 173 if (count-- == 0) 174 break; 175 176 /* 177 * Extract link register from frame and subtract 178 * 4 to convert into calling address (as opposed to 179 * return address) 180 */ 181 lr = *(db_addr_t *)(stackframe + 4) - 4; 182 if ((lr & 3) || (lr < 0x100)) { 183 db_printf("saved LR(0x%x) is invalid.", lr); 184 break; 185 } 186 187 db_printf("0x%08x: ", stackframe); 188 189 /* 190 * The trap code labels the return addresses from the 191 * call to C code as 'trapexit' and 'asttrapexit. Use this 192 * to determine if the callframe has to traverse a saved 193 * trap context 194 */ 195 if ((lr + 4 == (db_addr_t) &trapexit) || 196 (lr + 4 == (db_addr_t) &asttrapexit)) { 197 const char *trapstr; 198 struct trapframe *tf = (struct trapframe *) 199 (stackframe+8); 200 db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel"); 201 switch (tf->exc) { 202 case EXC_DSI: 203 /* XXX take advantage of the union. */ 204 db_printf("DSI %s trap @ %#x by ", 205 (tf->cpu.aim.dsisr & DSISR_STORE) ? "write" 206 : "read", tf->cpu.aim.dar); 207 goto print_trap; 208 case EXC_ALI: 209 /* XXX take advantage of the union. */ 210 db_printf("ALI trap @ %#x (xSR %#x) ", 211 tf->cpu.aim.dar, tf->cpu.aim.dsisr); 212 goto print_trap; 213 case EXC_ISI: trapstr = "ISI"; break; 214 case EXC_PGM: trapstr = "PGM"; break; 215 case EXC_SC: trapstr = "SC"; break; 216 case EXC_EXI: trapstr = "EXI"; break; 217 case EXC_MCHK: trapstr = "MCHK"; break; 218 #ifndef E500 219 case EXC_VEC: trapstr = "VEC"; break; 220 case EXC_FPA: trapstr = "FPA"; break; 221 case EXC_BPT: trapstr = "BPT"; break; 222 case EXC_TRC: trapstr = "TRC"; break; 223 case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break; 224 case EXC_SMI: trapstr = "SMI"; break; 225 case EXC_RST: trapstr = "RST"; break; 226 #endif 227 case EXC_FPU: trapstr = "FPU"; break; 228 case EXC_DECR: trapstr = "DECR"; break; 229 case EXC_PERF: trapstr = "PERF"; break; 230 default: trapstr = NULL; break; 231 } 232 if (trapstr != NULL) { 233 db_printf("%s trap by ", trapstr); 234 } else { 235 db_printf("trap %#x by ", tf->exc); 236 } 237 238 print_trap: 239 lr = (db_addr_t) tf->srr0; 240 diff = 0; 241 symname = NULL; 242 sym = db_search_symbol(lr, DB_STGY_ANY, &diff); 243 db_symbol_values(sym, &symname, 0); 244 if (symname == NULL || !strcmp(symname, "end")) { 245 db_printf("%#x: srr1=%#x\n", lr, tf->srr1); 246 } else { 247 db_printf("%s+%#x: srr1=%#x\n", symname, diff, 248 tf->srr1); 249 } 250 db_printf("%-10s r1=%#x cr=%#x xer=%#x ctr=%#x", 251 "", tf->fixreg[1], tf->cr, tf->xer, tf->ctr); 252 if (tf->exc == EXC_DSI) 253 db_printf(" sr=%#x", tf->cpu.aim.dsisr); 254 db_printf("\n"); 255 stackframe = (db_addr_t) tf->fixreg[1]; 256 if (kernel_only && (tf->srr1 & PSL_PR)) 257 break; 258 goto next_frame; 259 } 260 261 diff = 0; 262 symname = NULL; 263 sym = db_search_symbol(lr, DB_STGY_ANY, &diff); 264 db_symbol_values(sym, &symname, 0); 265 if (symname == NULL || !strcmp(symname, "end")) 266 db_printf("at %x", lr); 267 else 268 db_printf("at %s+%#x", symname, diff); 269 if (full) 270 /* Print all the args stored in that stackframe. */ 271 db_printf("(%x, %x, %x, %x, %x, %x, %x, %x)", 272 args[0], args[1], args[2], args[3], 273 args[4], args[5], args[6], args[7]); 274 db_printf("\n"); 275 } 276 277 return (0); 278 } 279 280 void 281 db_trace_self(void) 282 { 283 db_addr_t addr; 284 285 addr = (db_addr_t)__builtin_frame_address(1); 286 db_backtrace(curthread, addr, -1); 287 } 288 289 int 290 db_trace_thread(struct thread *td, int count) 291 { 292 struct pcb *ctx; 293 294 ctx = kdb_thr_ctx(td); 295 return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count)); 296 } 297