db_trace.c revision 1.34
1 /* $NetBSD: db_trace.c,v 1.34 2007/05/17 14:51:23 yamt 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/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: db_trace.c,v 1.34 2007/05/17 14:51:23 yamt Exp $"); 31 32 #include <sys/types.h> 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/proc.h> 36 #include <sys/user.h> 37 #include <sys/cpu.h> 38 39 #include <mips/mips_opcode.h> 40 41 #include <machine/db_machdep.h> 42 43 #include <ddb/db_interface.h> 44 #include <ddb/db_output.h> 45 #include <ddb/db_variables.h> 46 #include <ddb/db_sym.h> 47 48 int __start(void); /* lowest kernel code address */ 49 vaddr_t getreg_val(db_expr_t regno); 50 51 #define REG_ARG(i) (4+i) 52 #define SAVES_RA(x) isa_spill((x),31) 53 54 #define KERN_SAVE_REG_IDX(vp) ( \ 55 ((vp)->valuep >= (int *)(&((struct mips_saved_state *)0)->s0) && \ 56 (vp)->valuep <= (int *)(&((struct mips_saved_state *)0)->s7))? \ 57 vp->valuep - (int *)(&((struct mips_saved_state *)0)->s0): \ 58 ((vp)->valuep >= (int *)(&((struct mips_saved_state *)0)->sp) && \ 59 (vp)->valuep <= (int *)(&((struct mips_saved_state *)0)->ra))? \ 60 ((vp)->valuep-(int *)(&((struct mips_saved_state *)0)->sp)) + \ 61 ((int *)(&((struct mips_kernel_state *)0)->sp) - (int *)0): \ 62 -1) 63 64 db_sym_t localsym(db_sym_t sym, bool isreg, int *lex_level); 65 66 /* 67 * Machine register set. 68 */ 69 struct mips_saved_state *db_cur_exc_frame = 0; 70 71 /*XXX*/ 72 void stacktrace_subr(int, int, int, int, u_int, u_int, u_int, u_int, 73 void (*)(const char*, ...)); 74 75 /* 76 * Stack trace helper. 77 */ 78 void db_mips_stack_trace(int, vaddr_t, vaddr_t, vaddr_t, int, vaddr_t); 79 int db_mips_variable_func(const struct db_variable *, db_expr_t *, int); 80 81 #define DB_SETF_REGS db_mips_variable_func 82 #define DBREGS_REG() 83 84 const struct db_variable db_regs[] = { 85 { "at", (long *)&ddb_regs.f_regs[_R_AST], DB_SETF_REGS }, 86 { "v0", (long *)&ddb_regs.f_regs[_R_V0], DB_SETF_REGS }, 87 { "v1", (long *)&ddb_regs.f_regs[_R_V1], DB_SETF_REGS }, 88 { "a0", (long *)&ddb_regs.f_regs[_R_A0], DB_SETF_REGS }, 89 { "a1", (long *)&ddb_regs.f_regs[_R_A1], DB_SETF_REGS }, 90 { "a2", (long *)&ddb_regs.f_regs[_R_A2], DB_SETF_REGS }, 91 { "a3", (long *)&ddb_regs.f_regs[_R_A3], DB_SETF_REGS }, 92 #if defined(__mips_n32) || defined(__mips_n64) 93 { "a4", (long *)&ddb_regs.f_regs[_R_A4], DB_SETF_REGS }, 94 { "a5", (long *)&ddb_regs.f_regs[_R_A5], DB_SETF_REGS }, 95 { "a6", (long *)&ddb_regs.f_regs[_R_A6], DB_SETF_REGS }, 96 { "a7", (long *)&ddb_regs.f_regs[_R_A7], DB_SETF_REGS }, 97 { "t0", (long *)&ddb_regs.f_regs[_R_T0], DB_SETF_REGS }, 98 { "t1", (long *)&ddb_regs.f_regs[_R_T1], DB_SETF_REGS }, 99 { "t2", (long *)&ddb_regs.f_regs[_R_T2], DB_SETF_REGS }, 100 { "t3", (long *)&ddb_regs.f_regs[_R_T3], DB_SETF_REGS }, 101 #else 102 { "t0", (long *)&ddb_regs.f_regs[_R_T0], DB_SETF_REGS }, 103 { "t1", (long *)&ddb_regs.f_regs[_R_T1], DB_SETF_REGS }, 104 { "t2", (long *)&ddb_regs.f_regs[_R_T2], DB_SETF_REGS }, 105 { "t3", (long *)&ddb_regs.f_regs[_R_T3], DB_SETF_REGS }, 106 { "t4", (long *)&ddb_regs.f_regs[_R_T4], DB_SETF_REGS }, 107 { "t5", (long *)&ddb_regs.f_regs[_R_T5], DB_SETF_REGS }, 108 { "t6", (long *)&ddb_regs.f_regs[_R_T6], DB_SETF_REGS }, 109 { "t7", (long *)&ddb_regs.f_regs[_R_T7], DB_SETF_REGS }, 110 #endif /* __mips_n32 || __mips_n64 */ 111 { "s0", (long *)&ddb_regs.f_regs[_R_S0], DB_SETF_REGS }, 112 { "s1", (long *)&ddb_regs.f_regs[_R_S1], DB_SETF_REGS }, 113 { "s2", (long *)&ddb_regs.f_regs[_R_S2], DB_SETF_REGS }, 114 { "s3", (long *)&ddb_regs.f_regs[_R_S3], DB_SETF_REGS }, 115 { "s4", (long *)&ddb_regs.f_regs[_R_S4], DB_SETF_REGS }, 116 { "s5", (long *)&ddb_regs.f_regs[_R_S5], DB_SETF_REGS }, 117 { "s6", (long *)&ddb_regs.f_regs[_R_S6], DB_SETF_REGS }, 118 { "s7", (long *)&ddb_regs.f_regs[_R_S7], DB_SETF_REGS }, 119 { "t8", (long *)&ddb_regs.f_regs[_R_T8], DB_SETF_REGS }, 120 { "t9", (long *)&ddb_regs.f_regs[_R_T9], DB_SETF_REGS }, 121 { "k0", (long *)&ddb_regs.f_regs[_R_K0], DB_SETF_REGS }, 122 { "k1", (long *)&ddb_regs.f_regs[_R_K1], DB_SETF_REGS }, 123 { "gp", (long *)&ddb_regs.f_regs[_R_GP], DB_SETF_REGS }, 124 { "sp", (long *)&ddb_regs.f_regs[_R_SP], DB_SETF_REGS }, 125 { "fp", (long *)&ddb_regs.f_regs[_R_S8], DB_SETF_REGS },/* frame ptr */ 126 { "ra", (long *)&ddb_regs.f_regs[_R_RA], DB_SETF_REGS }, 127 { "sr", (long *)&ddb_regs.f_regs[_R_SR], DB_SETF_REGS }, 128 { "mdlo",(long *)&ddb_regs.f_regs[_R_MULLO], DB_SETF_REGS }, 129 { "mdhi",(long *)&ddb_regs.f_regs[_R_MULHI], DB_SETF_REGS }, 130 { "bad", (long *)&ddb_regs.f_regs[_R_BADVADDR], DB_SETF_REGS }, 131 { "cs", (long *)&ddb_regs.f_regs[_R_CAUSE], DB_SETF_REGS }, 132 { "pc", (long *)&ddb_regs.f_regs[_R_PC], DB_SETF_REGS }, 133 }; 134 const struct db_variable * const db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]); 135 136 void 137 db_stack_trace_print(db_expr_t addr, bool have_addr, db_expr_t count, 138 const char *modif, void (*pr)(const char *, ...)) 139 { 140 #ifndef DDB_TRACE 141 struct pcb *pcb; 142 struct proc *p; 143 struct lwp *l; 144 145 if (!have_addr) { 146 stacktrace_subr(ddb_regs.f_regs[_R_A0], 147 ddb_regs.f_regs[_R_A1], 148 ddb_regs.f_regs[_R_A2], 149 ddb_regs.f_regs[_R_A3], 150 ddb_regs.f_regs[_R_PC], 151 ddb_regs.f_regs[_R_SP], 152 /* non-virtual frame pointer */ 153 ddb_regs.f_regs[_R_S8], 154 ddb_regs.f_regs[_R_RA], 155 pr); 156 return; 157 } 158 159 /* "trace/t" */ 160 (*pr)("pid %d ", (int)addr); 161 p = p_find(addr, PFIND_LOCKED); 162 if (p == NULL) { 163 (*pr)("not found\n"); 164 return; 165 } 166 l = LIST_FIRST(&p->p_lwps); /* XXX NJWLWP */ 167 if (!(l->l_flag & LW_INMEM)) { 168 (*pr)("swapped out\n"); 169 return; 170 } 171 172 pcb = &(l->l_addr->u_pcb); 173 (*pr)("at %p\n", pcb); 174 175 stacktrace_subr(0,0,0,0, /* no args known */ 176 (int)cpu_switchto, 177 pcb->pcb_context[8], 178 pcb->pcb_context[9], 179 pcb->pcb_context[10], 180 pr); 181 #else 182 /* 183 * Incomplete but practically useful stack backtrace. 184 */ 185 #define MIPS_JR_RA 0x03e00008 /* instruction code for jr ra */ 186 #define MIPS_JR_K0 0x03400008 /* instruction code for jr k0 */ 187 #define MIPS_ERET 0x42000018 /* instruction code for eret */ 188 unsigned va, pc, ra, sp, func; 189 int insn; 190 InstFmt i; 191 int stacksize; 192 db_addr_t offset; 193 const char *name; 194 extern char verylocore[]; 195 196 pc = ddb_regs.f_regs[_R_PC]; 197 sp = ddb_regs.f_regs[_R_SP]; 198 ra = ddb_regs.f_regs[_R_RA]; 199 do { 200 va = pc; 201 do { 202 va -= sizeof(int); 203 insn = *(int *)va; 204 if (insn == MIPS_ERET) 205 goto mips3_eret; 206 } while (insn != MIPS_JR_RA && insn != MIPS_JR_K0); 207 va += sizeof(int); 208 mips3_eret: 209 va += sizeof(int); 210 while (*(int *)va == 0x00000000) 211 va += sizeof(int); 212 func = va; 213 stacksize = 0; 214 do { 215 i.word = *(int *)va; 216 if (i.IType.op == OP_SW 217 && i.IType.rs == _R_SP 218 && i.IType.rt == _R_RA) 219 ra = *(int *)(sp + (short)i.IType.imm); 220 if (i.IType.op == OP_ADDIU 221 && i.IType.rs == _R_SP 222 && i.IType.rt == _R_SP) 223 stacksize = -(short)i.IType.imm; 224 va += sizeof(int); 225 } while (va < pc); 226 227 db_find_sym_and_offset(func, &name, &offset); 228 if (name == 0) 229 name = "?"; 230 (*pr)("%s()+0x%x, called by %p, stack size %d\n", 231 name, pc - func, (void *)ra, stacksize); 232 233 if (ra == pc) { 234 (*pr)("-- loop? --\n"); 235 return; 236 } 237 sp += stacksize; 238 pc = ra; 239 } while (pc > (unsigned)verylocore); 240 if (pc < 0x80000000) 241 (*pr)("-- user process --\n"); 242 else 243 (*pr)("-- kernel entry --\n"); 244 #endif 245 } 246 247 void 248 db_mips_stack_trace(int count, vaddr_t stackp, vaddr_t the_pc, vaddr_t the_ra, 249 int flags, vaddr_t kstackp) 250 { 251 252 /* nothing... */ 253 } 254 255 256 int 257 db_mips_variable_func (const struct db_variable *vp, db_expr_t *valuep, 258 int db_var_fcn) 259 { 260 261 switch (db_var_fcn) { 262 case DB_VAR_GET: 263 *valuep = *(mips_reg_t *) vp->valuep; 264 break; 265 case DB_VAR_SET: 266 *(mips_reg_t *) vp->valuep = *valuep; 267 break; 268 } 269 return 0; 270 } 271
Indexes created Fri Sep 26 20:09:58 GMT 2025