db_trace.c revision 1.44
1 /* $NetBSD: db_trace.c,v 1.44 2020/08/15 07:42:07 mrg 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 1.44 2020/08/15 07:42:07 mrg Exp $"); 31 32 #include "opt_ddb.h" 33 34 #include <sys/types.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/cpu.h> 39 40 #include <mips/mips_opcode.h> 41 #include <mips/stacktrace.h> 42 43 #include <machine/db_machdep.h> 44 #include <machine/locore.h> 45 46 #include <ddb/db_interface.h> 47 #include <ddb/db_output.h> 48 #include <ddb/db_variables.h> 49 #include <ddb/db_sym.h> 50 51 int __start(void); /* lowest kernel code address */ 52 vaddr_t getreg_val(db_expr_t regno); 53 54 #define REG_ARG(i) (4+i) 55 #define SAVES_RA(x) isa_spill((x),31) 56 57 #define KERN_SAVE_REG_IDX(vp) ( \ 58 ((vp)->valuep >= (int *)(&((struct mips_saved_state *)0)->s0) && \ 59 (vp)->valuep <= (int *)(&((struct mips_saved_state *)0)->s7))? \ 60 vp->valuep - (int *)(&((struct mips_saved_state *)0)->s0): \ 61 ((vp)->valuep >= (int *)(&((struct mips_saved_state *)0)->sp) && \ 62 (vp)->valuep <= (int *)(&((struct mips_saved_state *)0)->ra))? \ 63 ((vp)->valuep-(int *)(&((struct mips_saved_state *)0)->sp)) + \ 64 ((int *)(&((struct mips_kernel_state *)0)->sp) - (int *)0): \ 65 -1) 66 67 db_sym_t localsym(db_sym_t sym, bool isreg, int *lex_level); 68 69 /* 70 * Machine register set. 71 */ 72 struct mips_saved_state *db_cur_exc_frame = 0; 73 74 /* 75 * Stack trace helper. 76 */ 77 void db_mips_stack_trace(int, vaddr_t, vaddr_t, vaddr_t, int, vaddr_t); 78 int db_mips_variable_func(const struct db_variable *, db_expr_t *, int); 79 80 #define DB_SETF_REGS db_mips_variable_func 81 #define DBREGS_REG() 82 83 const struct db_variable db_regs[] = { 84 { "at", (long *)&ddb_regs.r_regs[_R_AST], DB_SETF_REGS }, 85 { "v0", (long *)&ddb_regs.r_regs[_R_V0], DB_SETF_REGS }, 86 { "v1", (long *)&ddb_regs.r_regs[_R_V1], DB_SETF_REGS }, 87 { "a0", (long *)&ddb_regs.r_regs[_R_A0], DB_SETF_REGS }, 88 { "a1", (long *)&ddb_regs.r_regs[_R_A1], DB_SETF_REGS }, 89 { "a2", (long *)&ddb_regs.r_regs[_R_A2], DB_SETF_REGS }, 90 { "a3", (long *)&ddb_regs.r_regs[_R_A3], DB_SETF_REGS }, 91 #if defined(__mips_n32) || defined(__mips_n64) 92 { "a4", (long *)&ddb_regs.r_regs[_R_A4], DB_SETF_REGS }, 93 { "a5", (long *)&ddb_regs.r_regs[_R_A5], DB_SETF_REGS }, 94 { "a6", (long *)&ddb_regs.r_regs[_R_A6], DB_SETF_REGS }, 95 { "a7", (long *)&ddb_regs.r_regs[_R_A7], DB_SETF_REGS }, 96 { "t0", (long *)&ddb_regs.r_regs[_R_T0], DB_SETF_REGS }, 97 { "t1", (long *)&ddb_regs.r_regs[_R_T1], DB_SETF_REGS }, 98 { "t2", (long *)&ddb_regs.r_regs[_R_T2], DB_SETF_REGS }, 99 { "t3", (long *)&ddb_regs.r_regs[_R_T3], DB_SETF_REGS }, 100 #else 101 { "t0", (long *)&ddb_regs.r_regs[_R_T0], DB_SETF_REGS }, 102 { "t1", (long *)&ddb_regs.r_regs[_R_T1], DB_SETF_REGS }, 103 { "t2", (long *)&ddb_regs.r_regs[_R_T2], DB_SETF_REGS }, 104 { "t3", (long *)&ddb_regs.r_regs[_R_T3], DB_SETF_REGS }, 105 { "t4", (long *)&ddb_regs.r_regs[_R_T4], DB_SETF_REGS }, 106 { "t5", (long *)&ddb_regs.r_regs[_R_T5], DB_SETF_REGS }, 107 { "t6", (long *)&ddb_regs.r_regs[_R_T6], DB_SETF_REGS }, 108 { "t7", (long *)&ddb_regs.r_regs[_R_T7], DB_SETF_REGS }, 109 #endif /* __mips_n32 || __mips_n64 */ 110 { "s0", (long *)&ddb_regs.r_regs[_R_S0], DB_SETF_REGS }, 111 { "s1", (long *)&ddb_regs.r_regs[_R_S1], DB_SETF_REGS }, 112 { "s2", (long *)&ddb_regs.r_regs[_R_S2], DB_SETF_REGS }, 113 { "s3", (long *)&ddb_regs.r_regs[_R_S3], DB_SETF_REGS }, 114 { "s4", (long *)&ddb_regs.r_regs[_R_S4], DB_SETF_REGS }, 115 { "s5", (long *)&ddb_regs.r_regs[_R_S5], DB_SETF_REGS }, 116 { "s6", (long *)&ddb_regs.r_regs[_R_S6], DB_SETF_REGS }, 117 { "s7", (long *)&ddb_regs.r_regs[_R_S7], DB_SETF_REGS }, 118 { "t8", (long *)&ddb_regs.r_regs[_R_T8], DB_SETF_REGS }, 119 { "t9", (long *)&ddb_regs.r_regs[_R_T9], DB_SETF_REGS }, 120 { "k0", (long *)&ddb_regs.r_regs[_R_K0], DB_SETF_REGS }, 121 { "k1", (long *)&ddb_regs.r_regs[_R_K1], DB_SETF_REGS }, 122 { "gp", (long *)&ddb_regs.r_regs[_R_GP], DB_SETF_REGS }, 123 { "sp", (long *)&ddb_regs.r_regs[_R_SP], DB_SETF_REGS }, 124 { "fp", (long *)&ddb_regs.r_regs[_R_S8], DB_SETF_REGS },/* frame ptr */ 125 { "ra", (long *)&ddb_regs.r_regs[_R_RA], DB_SETF_REGS }, 126 { "sr", (long *)&ddb_regs.r_regs[_R_SR], DB_SETF_REGS }, 127 { "mdlo",(long *)&ddb_regs.r_regs[_R_MULLO], DB_SETF_REGS }, 128 { "mdhi",(long *)&ddb_regs.r_regs[_R_MULHI], DB_SETF_REGS }, 129 { "bad", (long *)&ddb_regs.r_regs[_R_BADVADDR], DB_SETF_REGS }, 130 { "cs", (long *)&ddb_regs.r_regs[_R_CAUSE], DB_SETF_REGS }, 131 { "pc", (long *)&ddb_regs.r_regs[_R_PC], DB_SETF_REGS }, 132 }; 133 const struct db_variable * const db_eregs = db_regs + __arraycount(db_regs); 134 135 void 136 db_stack_trace_print(db_expr_t addr, bool have_addr, db_expr_t count, 137 const char *modif, void (*pr)(const char *, ...)) 138 { 139 #ifndef DDB_TRACE 140 struct pcb *pcb; 141 struct proc *p; 142 struct lwp *l; 143 const char *cp = modif; 144 char c; 145 bool lwpaddr = false; 146 147 if (!have_addr) { 148 struct reg * regs = &ddb_regs; 149 stacktrace_subr(regs->r_regs[_R_A0], 150 regs->r_regs[_R_A1], 151 regs->r_regs[_R_A2], 152 regs->r_regs[_R_A3], 153 regs->r_regs[_R_PC], 154 regs->r_regs[_R_SP], 155 /* non-virtual frame pointer */ 156 regs->r_regs[_R_S8], 157 regs->r_regs[_R_RA], 158 pr); 159 return; 160 } 161 162 while ((c = *cp++) != 0) { 163 if (c == 'a') { 164 lwpaddr = true; 165 } 166 } 167 168 if (lwpaddr) { 169 l = (struct lwp *)(intptr_t)addr; 170 (*pr)("pid %d.%d ", l->l_proc->p_pid, l->l_lid); 171 } else { 172 /* "trace/t" */ 173 174 (*pr)("pid %d ", (int)addr); 175 p = proc_find_raw(addr); 176 if (p == NULL) { 177 (*pr)("not found\n"); 178 return; 179 } 180 l = LIST_FIRST(&p->p_lwps); /* XXX NJWLWP */ 181 } 182 183 pcb = lwp_getpcb(l); 184 (*pr)("at %p\n", pcb); 185 186 stacktrace_subr(0,0,0,0, /* no args known */ 187 (vaddr_t)cpu_switchto, 188 pcb->pcb_context.val[_L_SP], 189 pcb->pcb_context.val[_L_S8], 190 pcb->pcb_context.val[_L_RA], 191 pr); 192 #else 193 /* 194 * Incomplete but practically useful stack backtrace. 195 */ 196 #define MIPS_JR_RA 0x03e00008 /* instruction code for jr ra */ 197 #define MIPS_JR_K0 0x03400008 /* instruction code for jr k0 */ 198 #define MIPS_ERET 0x42000018 /* instruction code for eret */ 199 register_t va, pc, ra, sp, func; 200 int insn; 201 InstFmt i; 202 int stacksize; 203 db_addr_t offset; 204 const char *name; 205 extern char verylocore[]; 206 207 pc = ddb_regs.r_regs[_R_PC]; 208 sp = ddb_regs.r_regs[_R_SP]; 209 ra = ddb_regs.r_regs[_R_RA]; 210 do { 211 va = pc; 212 do { 213 va -= sizeof(int); 214 insn = *(int *)(intptr_t)va; 215 if (insn == MIPS_ERET) 216 goto mips3_eret; 217 } while (insn != MIPS_JR_RA && insn != MIPS_JR_K0); 218 va += sizeof(int); 219 mips3_eret: 220 va += sizeof(int); 221 while (*(int *)(intptr_t)va == 0x00000000) 222 va += sizeof(int); 223 func = va; 224 stacksize = 0; 225 do { 226 i.word = *(int *)(intptr_t)va; 227 if (((i.IType.op == OP_SW) || (i.IType.op == OP_SD)) 228 && i.IType.rs == _R_SP 229 && i.IType.rt == _R_RA) 230 ra = *(int *)(intptr_t)(sp + (short)i.IType.imm); 231 if (((i.IType.op == OP_ADDIU) || (i.IType.op == OP_DADDIU)) 232 && i.IType.rs == _R_SP 233 && i.IType.rt == _R_SP) 234 stacksize = -(short)i.IType.imm; 235 va += sizeof(int); 236 } while (va < pc); 237 238 db_find_sym_and_offset(func, &name, &offset); 239 if (name == 0) 240 name = "?"; 241 (*pr)("%s()+0x%x, called by %p, stack size %d\n", 242 name, pc - func, (void *)(intptr_t)ra, stacksize); 243 244 if (ra == pc) { 245 (*pr)("-- loop? --\n"); 246 return; 247 } 248 sp += stacksize; 249 pc = ra; 250 } while (pc > (intptr_t)verylocore); 251 if (pc < 0x80000000) 252 (*pr)("-- user process --\n"); 253 else 254 (*pr)("-- kernel entry --\n"); 255 #endif 256 } 257 258 void 259 db_mips_stack_trace(int count, vaddr_t stackp, vaddr_t the_pc, vaddr_t the_ra, 260 int flags, vaddr_t kstackp) 261 { 262 263 /* nothing... */ 264 } 265 266 267 int 268 db_mips_variable_func (const struct db_variable *vp, db_expr_t *valuep, 269 int db_var_fcn) 270 { 271 272 switch (db_var_fcn) { 273 case DB_VAR_GET: 274 *valuep = *(mips_reg_t *) vp->valuep; 275 break; 276 case DB_VAR_SET: 277 *(mips_reg_t *) vp->valuep = *valuep; 278 break; 279 } 280 return 0; 281 } 282
Indexes created Thu Sep 25 06:09:39 GMT 2025