Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/db_trace.c
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1 /* $FreeBSD: releng/11.2/sys/powerpc/powerpc/db_trace.c 316369 2017-04-01 19:27:06Z jhibbits $ */ 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 #ifdef __powerpc64__ 57 #define CALLOFFSET 8 /* Include TOC reload slot */ 58 #else 59 #define CALLOFFSET 4 60 #endif 61 62 struct db_variable db_regs[] = { 63 { "r0", DB_OFFSET(fixreg[0]), db_frame }, 64 { "r1", DB_OFFSET(fixreg[1]), db_frame }, 65 { "r2", DB_OFFSET(fixreg[2]), db_frame }, 66 { "r3", DB_OFFSET(fixreg[3]), db_frame }, 67 { "r4", DB_OFFSET(fixreg[4]), db_frame }, 68 { "r5", DB_OFFSET(fixreg[5]), db_frame }, 69 { "r6", DB_OFFSET(fixreg[6]), db_frame }, 70 { "r7", DB_OFFSET(fixreg[7]), db_frame }, 71 { "r8", DB_OFFSET(fixreg[8]), db_frame }, 72 { "r9", DB_OFFSET(fixreg[9]), db_frame }, 73 { "r10", DB_OFFSET(fixreg[10]), db_frame }, 74 { "r11", DB_OFFSET(fixreg[11]), db_frame }, 75 { "r12", DB_OFFSET(fixreg[12]), db_frame }, 76 { "r13", DB_OFFSET(fixreg[13]), db_frame }, 77 { "r14", DB_OFFSET(fixreg[14]), db_frame }, 78 { "r15", DB_OFFSET(fixreg[15]), db_frame }, 79 { "r16", DB_OFFSET(fixreg[16]), db_frame }, 80 { "r17", DB_OFFSET(fixreg[17]), db_frame }, 81 { "r18", DB_OFFSET(fixreg[18]), db_frame }, 82 { "r19", DB_OFFSET(fixreg[19]), db_frame }, 83 { "r20", DB_OFFSET(fixreg[20]), db_frame }, 84 { "r21", DB_OFFSET(fixreg[21]), db_frame }, 85 { "r22", DB_OFFSET(fixreg[22]), db_frame }, 86 { "r23", DB_OFFSET(fixreg[23]), db_frame }, 87 { "r24", DB_OFFSET(fixreg[24]), db_frame }, 88 { "r25", DB_OFFSET(fixreg[25]), db_frame }, 89 { "r26", DB_OFFSET(fixreg[26]), db_frame }, 90 { "r27", DB_OFFSET(fixreg[27]), db_frame }, 91 { "r28", DB_OFFSET(fixreg[28]), db_frame }, 92 { "r29", DB_OFFSET(fixreg[29]), db_frame }, 93 { "r30", DB_OFFSET(fixreg[30]), db_frame }, 94 { "r31", DB_OFFSET(fixreg[31]), db_frame }, 95 { "srr0", DB_OFFSET(srr0), db_frame }, 96 { "srr1", DB_OFFSET(srr1), db_frame }, 97 { "lr", DB_OFFSET(lr), db_frame }, 98 { "ctr", DB_OFFSET(ctr), db_frame }, 99 { "cr", DB_OFFSET(cr), db_frame }, 100 { "xer", DB_OFFSET(xer), db_frame }, 101 { "dar", DB_OFFSET(dar), db_frame }, 102 #ifdef AIM 103 { "dsisr", DB_OFFSET(cpu.aim.dsisr), db_frame }, 104 #endif 105 #if defined(BOOKE) 106 { "esr", DB_OFFSET(cpu.booke.esr), db_frame }, 107 #endif 108 }; 109 struct db_variable *db_eregs = db_regs + nitems(db_regs); 110 111 /* 112 * register variable handling 113 */ 114 static int 115 db_frame(struct db_variable *vp, db_expr_t *valuep, int op) 116 { 117 register_t *reg; 118 119 if (kdb_frame == NULL) 120 return (0); 121 reg = (register_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep); 122 if (op == DB_VAR_GET) 123 *valuep = *reg; 124 else 125 *reg = *valuep; 126 return (1); 127 } 128 129 130 /* 131 * Frame tracing. 132 */ 133 static int 134 db_backtrace(struct thread *td, db_addr_t fp, int count) 135 { 136 db_addr_t stackframe, lr, *args; 137 boolean_t kernel_only = TRUE; 138 boolean_t full = FALSE; 139 140 #if 0 141 { 142 register char *cp = modif; 143 register char c; 144 145 while ((c = *cp++) != 0) { 146 if (c == 't') 147 trace_thread = TRUE; 148 if (c == 'u') 149 kernel_only = FALSE; 150 if (c == 'f') 151 full = TRUE; 152 } 153 } 154 #endif 155 156 stackframe = fp; 157 158 while (!db_pager_quit) { 159 if (stackframe < PAGE_SIZE) 160 break; 161 162 /* 163 * Locate the next frame by grabbing the backchain ptr 164 * from frame[0] 165 */ 166 stackframe = *(db_addr_t *)stackframe; 167 168 next_frame: 169 #ifdef __powerpc64__ 170 /* The saved arg values start at frame[6] */ 171 args = (db_addr_t *)(stackframe + 48); 172 #else 173 /* The saved arg values start at frame[2] */ 174 args = (db_addr_t *)(stackframe + 8); 175 #endif 176 177 if (stackframe < PAGE_SIZE) 178 break; 179 180 if (count-- == 0) 181 break; 182 183 /* 184 * Extract link register from frame and subtract 185 * 4 to convert into calling address (as opposed to 186 * return address) 187 */ 188 #ifdef __powerpc64__ 189 lr = *(db_addr_t *)(stackframe + 16) - 4; 190 #else 191 lr = *(db_addr_t *)(stackframe + 4) - 4; 192 #endif 193 if ((lr & 3) || (lr < 0x100)) { 194 db_printf("saved LR(0x%zx) is invalid.", lr); 195 break; 196 } 197 198 #ifdef __powerpc64__ 199 db_printf("0x%016lx: ", stackframe); 200 #else 201 db_printf("0x%08x: ", stackframe); 202 #endif 203 204 /* 205 * The trap code labels the return addresses from the 206 * call to C code as 'trapexit' and 'asttrapexit. Use this 207 * to determine if the callframe has to traverse a saved 208 * trap context 209 */ 210 if ((lr + CALLOFFSET == (db_addr_t) &trapexit) || 211 (lr + CALLOFFSET == (db_addr_t) &asttrapexit)) { 212 const char *trapstr; 213 struct trapframe *tf = (struct trapframe *)(args); 214 db_printf("%s ", tf->srr1 & PSL_PR ? "user" : "kernel"); 215 switch (tf->exc) { 216 case EXC_DSI: 217 /* XXX take advantage of the union. */ 218 db_printf("DSI %s trap @ %#zx by ", 219 (tf->cpu.aim.dsisr & DSISR_STORE) ? "write" 220 : "read", tf->dar); 221 goto print_trap; 222 case EXC_ALI: 223 /* XXX take advantage of the union. */ 224 db_printf("ALI trap @ %#zx (xSR %#x) ", 225 tf->dar, (uint32_t)tf->cpu.aim.dsisr); 226 goto print_trap; 227 #ifdef __powerpc64__ 228 case EXC_DSE: 229 db_printf("DSE trap @ %#zx by ", tf->dar); 230 goto print_trap; 231 case EXC_ISE: 232 db_printf("ISE trap @ %#zx by ", tf->srr0); 233 goto print_trap; 234 #endif 235 case EXC_ISI: trapstr = "ISI"; break; 236 case EXC_PGM: trapstr = "PGM"; break; 237 case EXC_SC: trapstr = "SC"; break; 238 case EXC_EXI: trapstr = "EXI"; break; 239 case EXC_MCHK: trapstr = "MCHK"; break; 240 #if !defined(BOOKE) 241 case EXC_VEC: trapstr = "VEC"; break; 242 case EXC_FPA: trapstr = "FPA"; break; 243 case EXC_BPT: trapstr = "BPT"; break; 244 case EXC_TRC: trapstr = "TRC"; break; 245 case EXC_RUNMODETRC: trapstr = "RUNMODETRC"; break; 246 case EXC_SMI: trapstr = "SMI"; break; 247 case EXC_RST: trapstr = "RST"; break; 248 #endif 249 case EXC_FPU: trapstr = "FPU"; break; 250 case EXC_DECR: trapstr = "DECR"; break; 251 case EXC_PERF: trapstr = "PERF"; break; 252 case EXC_VSX: trapstr = "VSX"; break; 253 default: trapstr = NULL; break; 254 } 255 if (trapstr != NULL) { 256 db_printf("%s trap by ", trapstr); 257 } else { 258 db_printf("trap %#zx by ", tf->exc); 259 } 260 261 print_trap: 262 lr = (db_addr_t) tf->srr0; 263 db_printsym(lr, DB_STGY_ANY); 264 db_printf(": srr1=%#zx\n", tf->srr1); 265 db_printf("%-10s r1=%#zx cr=%#x xer=%#x ctr=%#zx", 266 "", tf->fixreg[1], (uint32_t)tf->cr, 267 (uint32_t)tf->xer, tf->ctr); 268 #ifdef __powerpc64__ 269 db_printf(" r2=%#zx", tf->fixreg[2]); 270 #endif 271 if (tf->exc == EXC_DSI) 272 db_printf(" sr=%#x", 273 (uint32_t)tf->cpu.aim.dsisr); 274 db_printf("\n"); 275 stackframe = (db_addr_t) tf->fixreg[1]; 276 if (kernel_only && (tf->srr1 & PSL_PR)) 277 break; 278 goto next_frame; 279 } 280 281 db_printf("at "); 282 db_printsym(lr, DB_STGY_PROC); 283 if (full) 284 /* Print all the args stored in that stackframe. */ 285 db_printf("(%zx, %zx, %zx, %zx, %zx, %zx, %zx, %zx)", 286 args[0], args[1], args[2], args[3], 287 args[4], args[5], args[6], args[7]); 288 db_printf("\n"); 289 } 290 291 return (0); 292 } 293 294 void 295 db_trace_self(void) 296 { 297 db_addr_t addr; 298 299 addr = (db_addr_t)__builtin_frame_address(0); 300 if (addr == 0) { 301 db_printf("Null frame address\n"); 302 return; 303 } 304 db_backtrace(curthread, *(db_addr_t *)addr, -1); 305 } 306 307 int 308 db_trace_thread(struct thread *td, int count) 309 { 310 struct pcb *ctx; 311 312 ctx = kdb_thr_ctx(td); 313 return (db_backtrace(td, (db_addr_t)ctx->pcb_sp, count)); 314 }
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