db_trace.c revision 1.16
1 /* $NetBSD: db_trace.c,v 1.16 2000/09/19 06:22:51 jeffs Exp $ */ 2 3 /* 4 * Mach Operating System 5 * Copyright (c) 1993-1987 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie Mellon 26 * the rights to redistribute these changes. 27 */ 28 29 #include <sys/types.h> 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/proc.h> 33 #include <sys/user.h> 34 35 #include <mips/mips_opcode.h> 36 37 #include <machine/param.h> 38 #include <machine/db_machdep.h> 39 #include <ddb/db_interface.h> 40 #include <ddb/db_output.h> 41 #include <ddb/db_variables.h> 42 #include <ddb/db_sym.h> 43 44 int __start __P((void)); /* lowest kernel code address */ 45 vaddr_t getreg_val __P((db_expr_t regno)); 46 47 #define REG_ARG(i) (4+i) 48 #define SAVES_RA(x) isa_spill((x),31) 49 50 #define KERN_SAVE_REG_IDX(vp) ( \ 51 ((vp)->valuep >= (int *)(&((struct mips_saved_state *)0)->s0) && \ 52 (vp)->valuep <= (int *)(&((struct mips_saved_state *)0)->s7))? \ 53 vp->valuep - (int *)(&((struct mips_saved_state *)0)->s0): \ 54 ((vp)->valuep >= (int *)(&((struct mips_saved_state *)0)->sp) && \ 55 (vp)->valuep <= (int *)(&((struct mips_saved_state *)0)->ra))? \ 56 ((vp)->valuep-(int *)(&((struct mips_saved_state *)0)->sp)) + \ 57 ((int *)(&((struct mips_kernel_state *)0)->sp) - (int *)0): \ 58 -1) 59 60 db_sym_t localsym __P((db_sym_t sym, boolean_t isreg, int *lex_level)); 61 62 /* 63 * Machine register set. 64 */ 65 struct mips_saved_state *db_cur_exc_frame = 0; 66 67 /* 68 * forward declarations 69 */ 70 int print_exception_frame __P((struct mips_saved_state *fp, 71 unsigned epc)); 72 73 /*XXX*/ 74 void stacktrace_subr __P((int a0, int a1, int a2, int a3, 75 u_int pc, u_int sp, u_int fp, u_int ra, 76 void (*)(const char*, ...))); 77 78 /* 79 * Stack trace helper. 80 */ 81 void db_mips_stack_trace __P((int count, vaddr_t stackp, 82 vaddr_t the_pc, vaddr_t the_ra, int flags, 83 vaddr_t kstackp)); 84 int db_mips_variable_func __P((struct db_variable *vp, db_expr_t *valuep, 85 int db_var_fun)); 86 87 #define DB_SETF_REGS db_mips_variable_func 88 #define DBREGS_REG() 89 90 struct db_variable db_regs[] = { 91 { "at", (long *)&ddb_regs.f_regs[AST], DB_SETF_REGS }, 92 { "v0", (long *)&ddb_regs.f_regs[V0], DB_SETF_REGS }, 93 { "v1", (long *)&ddb_regs.f_regs[V1], DB_SETF_REGS }, 94 { "a0", (long *)&ddb_regs.f_regs[A0], DB_SETF_REGS }, 95 { "a1", (long *)&ddb_regs.f_regs[A1], DB_SETF_REGS }, 96 { "a2", (long *)&ddb_regs.f_regs[A2], DB_SETF_REGS }, 97 { "a3", (long *)&ddb_regs.f_regs[A3], DB_SETF_REGS }, 98 { "t0", (long *)&ddb_regs.f_regs[T0], DB_SETF_REGS }, 99 { "t1", (long *)&ddb_regs.f_regs[T1], DB_SETF_REGS }, 100 { "t2", (long *)&ddb_regs.f_regs[T2], DB_SETF_REGS }, 101 { "t3", (long *)&ddb_regs.f_regs[T3], DB_SETF_REGS }, 102 { "t4", (long *)&ddb_regs.f_regs[T4], DB_SETF_REGS }, 103 { "t5", (long *)&ddb_regs.f_regs[T5], DB_SETF_REGS }, 104 { "t6", (long *)&ddb_regs.f_regs[T6], DB_SETF_REGS }, 105 { "t7", (long *)&ddb_regs.f_regs[T7], DB_SETF_REGS }, 106 { "s0", (long *)&ddb_regs.f_regs[S0], DB_SETF_REGS }, 107 { "s1", (long *)&ddb_regs.f_regs[S1], DB_SETF_REGS }, 108 { "s2", (long *)&ddb_regs.f_regs[S2], DB_SETF_REGS }, 109 { "s3", (long *)&ddb_regs.f_regs[S3], DB_SETF_REGS }, 110 { "s4", (long *)&ddb_regs.f_regs[S4], DB_SETF_REGS }, 111 { "s5", (long *)&ddb_regs.f_regs[S5], DB_SETF_REGS }, 112 { "s6", (long *)&ddb_regs.f_regs[S6], DB_SETF_REGS }, 113 { "s7", (long *)&ddb_regs.f_regs[S7], DB_SETF_REGS }, 114 { "t8", (long *)&ddb_regs.f_regs[T8], DB_SETF_REGS }, 115 { "t9", (long *)&ddb_regs.f_regs[T9], DB_SETF_REGS }, 116 { "k0", (long *)&ddb_regs.f_regs[K0], DB_SETF_REGS }, 117 { "k1", (long *)&ddb_regs.f_regs[K1], DB_SETF_REGS }, 118 { "gp", (long *)&ddb_regs.f_regs[GP], DB_SETF_REGS }, 119 { "sp", (long *)&ddb_regs.f_regs[SP], DB_SETF_REGS }, 120 { "fp", (long *)&ddb_regs.f_regs[S8], DB_SETF_REGS }, /* frame ptr */ 121 { "ra", (long *)&ddb_regs.f_regs[RA], DB_SETF_REGS }, 122 { "sr", (long *)&ddb_regs.f_regs[SR], DB_SETF_REGS }, 123 { "mdlo",(long *)&ddb_regs.f_regs[MULLO], DB_SETF_REGS }, 124 { "mdhi",(long *)&ddb_regs.f_regs[MULHI], DB_SETF_REGS }, 125 { "bad", (long *)&ddb_regs.f_regs[BADVADDR], DB_SETF_REGS }, 126 { "cs", (long *)&ddb_regs.f_regs[CAUSE], DB_SETF_REGS }, 127 { "pc", (long *)&ddb_regs.f_regs[PC], DB_SETF_REGS }, 128 }; 129 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]); 130 131 void 132 db_stack_trace_print(addr, have_addr, count, modif, pr) 133 db_expr_t addr; 134 boolean_t have_addr; 135 db_expr_t count; 136 char *modif; 137 void (*pr) __P((const char *, ...)); 138 { 139 #ifndef DDB_TRACE 140 struct pcb *pcb; 141 struct proc *p; 142 143 if (!have_addr) { 144 stacktrace_subr(ddb_regs.f_regs[A0], ddb_regs.f_regs[A1], 145 ddb_regs.f_regs[A2], ddb_regs.f_regs[A3], 146 ddb_regs.f_regs[PC], 147 ddb_regs.f_regs[SP], 148 /* non-virtual frame pointer */ 149 ddb_regs.f_regs[S8], 150 ddb_regs.f_regs[RA], 151 pr); 152 return; 153 } 154 155 /* "trace/t" */ 156 (*pr)("pid %d ", (int)addr); 157 p = pfind(addr); 158 if (p == NULL) { 159 (*pr)("not found\n"); 160 return; 161 } 162 if (!(p->p_flag&P_INMEM)) { 163 (*pr)("swapped out\n"); 164 return; 165 } 166 167 pcb = &(p->p_addr->u_pcb); 168 (*pr)("at %p\n", pcb); 169 170 stacktrace_subr(0,0,0,0, /* no args known */ 171 (int)cpu_switch, 172 pcb->pcb_context[8], 173 pcb->pcb_context[9], 174 pcb->pcb_context[10], 175 pr); 176 #else 177 /* 178 * Incomplete but practically useful stack backtrace. 179 */ 180 #define MIPS_JR_RA 0x03e00008 /* instruction code for jr ra */ 181 #define MIPS_JR_K0 0x03400008 /* instruction code for jr k0 */ 182 #define MIPS_ERET 0x42000018 /* instruction code for eret */ 183 unsigned va, pc, ra, sp, func; 184 int insn; 185 InstFmt i; 186 int stacksize; 187 db_addr_t offset; 188 char *name; 189 extern char verylocore[]; 190 191 pc = ddb_regs.f_regs[PC]; 192 sp = ddb_regs.f_regs[SP]; 193 ra = ddb_regs.f_regs[RA]; 194 do { 195 va = pc; 196 do { 197 va -= sizeof(int); 198 insn = *(int *)va; 199 if (insn == MIPS_ERET) 200 goto mips3_eret; 201 } while (insn != MIPS_JR_RA && insn != MIPS_JR_K0); 202 va += sizeof(int); 203 mips3_eret: 204 va += sizeof(int); 205 while (*(int *)va == 0x00000000) 206 va += sizeof(int); 207 func = va; 208 stacksize = 0; 209 do { 210 i.word = *(int *)va; 211 if (i.IType.op == OP_SW 212 && i.IType.rs == SP 213 && i.IType.rt == RA) 214 ra = *(int *)(sp + (short)i.IType.imm); 215 if (i.IType.op == OP_ADDIU 216 && i.IType.rs == SP 217 && i.IType.rt == SP) 218 stacksize = -(short)i.IType.imm; 219 va += sizeof(int); 220 } while (va < pc); 221 222 db_find_sym_and_offset(func, &name, &offset); 223 if (name == 0) 224 name = "?"; 225 (*pr)("%s()+0x%x, called by %p, stack size %d\n", 226 name, pc - func, (void *)ra, stacksize); 227 228 if (ra == pc) { 229 (*pr)("-- loop? --\n"); 230 return; 231 } 232 sp += stacksize; 233 pc = ra; 234 } while (pc > (unsigned)verylocore); 235 if (pc < 0x80000000) 236 (*pr)("-- user process --\n"); 237 else 238 (*pr)("-- kernel entry --\n"); 239 #endif 240 } 241 242 void 243 db_mips_stack_trace(count, stackp, the_pc, the_ra, flags, kstackp) 244 int count; 245 vaddr_t stackp, the_pc, the_ra; 246 int flags; 247 vaddr_t kstackp; 248 { 249 return; 250 } 251 252 253 int 254 db_mips_variable_func (struct db_variable *vp, 255 db_expr_t *valuep, 256 int db_var_fcn) 257 { 258 switch (db_var_fcn) { 259 case DB_VAR_GET: 260 *valuep = *(mips_reg_t *) vp->valuep; 261 break; 262 case DB_VAR_SET: 263 *(mips_reg_t *) vp->valuep = *valuep; 264 break; 265 } 266 return 0; 267 } 268
Indexes created Tue Sep 23 02:09:52 GMT 2025