sys/sparc64/sparc64/db_trace.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2001 Jake Burkholder.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/kdb.h>
  35 #include <sys/proc.h>
  36 #include <sys/stack.h>
  37 #include <sys/sysent.h>
  38
  39 #include <vm/vm.h>
  40 #include <vm/vm_page.h>
  41 #include <vm/vm_map.h>
  42
  43 #include <machine/cpu.h>
  44 #include <machine/pcb.h>
  45 #include <machine/stack.h>
  46 #include <machine/trap.h>
  47 #include <machine/vmparam.h>
  48
  49 #include <ddb/ddb.h>
  50 #include <ddb/db_access.h>
  51 #include <ddb/db_sym.h>
  52 #include <ddb/db_variables.h>
  53 #include <ddb/db_watch.h>
  54
  55 static db_varfcn_t db_frame;
  56
  57 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
  58 struct  db_variable db_regs[] = {
  59         { "g0",         DB_OFFSET(tf_global[0]),        db_frame },
  60         { "g1",         DB_OFFSET(tf_global[1]),        db_frame },
  61         { "g2",         DB_OFFSET(tf_global[2]),        db_frame },
  62         { "g3",         DB_OFFSET(tf_global[3]),        db_frame },
  63         { "g4",         DB_OFFSET(tf_global[4]),        db_frame },
  64         { "g5",         DB_OFFSET(tf_global[5]),        db_frame },
  65         { "g6",         DB_OFFSET(tf_global[6]),        db_frame },
  66         { "g7",         DB_OFFSET(tf_global[7]),        db_frame },
  67         { "i0",         DB_OFFSET(tf_out[0]),           db_frame },
  68         { "i1",         DB_OFFSET(tf_out[1]),           db_frame },
  69         { "i2",         DB_OFFSET(tf_out[2]),           db_frame },
  70         { "i3",         DB_OFFSET(tf_out[3]),           db_frame },
  71         { "i4",         DB_OFFSET(tf_out[4]),           db_frame },
  72         { "i5",         DB_OFFSET(tf_out[5]),           db_frame },
  73         { "i6",         DB_OFFSET(tf_out[6]),           db_frame },
  74         { "i7",         DB_OFFSET(tf_out[7]),           db_frame },
  75         { "tnpc",       DB_OFFSET(tf_tnpc),             db_frame },
  76         { "tpc",        DB_OFFSET(tf_tpc),              db_frame },
  77         { "tstate",     DB_OFFSET(tf_tstate),           db_frame },
  78 };
  79 struct db_variable *db_eregs = db_regs + nitems(db_regs);
  80
  81 static int
  82 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  83 {
  84         uint64_t *reg;
  85
  86         if (kdb_frame == NULL)
  87                 return (0);
  88         reg = (uint64_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
  89         if (op == DB_VAR_GET)
  90                 *valuep = *reg;
  91         else
  92                 *reg = *valuep;
  93         return (1);
  94 }
  95
  96 /*
  97  * User stack trace (debugging aid).
  98  */
  99 static void
 100 db_utrace(struct thread *td, struct trapframe *tf, int count)
 101 {
 102         struct pcb *pcb;
 103         db_addr_t sp, rsp, o7, pc;
 104         int i, found;
 105
 106         pcb = td->td_pcb;
 107         sp = db_get_value((db_addr_t)&tf->tf_sp, sizeof(tf->tf_sp), FALSE);
 108         o7 = db_get_value((db_addr_t)&tf->tf_out[7], sizeof(tf->tf_out[7]),
 109             FALSE);
 110         pc = db_get_value((db_addr_t)&tf->tf_tpc, sizeof(tf->tf_tpc), FALSE);
 111         db_printf("user trace: trap %%o7=%#lx\n", o7);
 112         while (count-- && sp != 0 && !db_pager_quit) {
 113                 db_printf("pc %#lx, sp %#lx\n", pc, sp);
 114                 /* First, check whether the frame is in the pcb. */
 115                 found = 0;
 116                 for (i = 0; i < pcb->pcb_nsaved; i++) {
 117                         if (pcb->pcb_rwsp[i] == sp) {
 118                                 found = 1;
 119                                 sp = pcb->pcb_rw[i].rw_in[6];
 120                                 pc = pcb->pcb_rw[i].rw_in[7];
 121                                 break;
 122                         }
 123                 }
 124                 if (!found) {
 125                         rsp = sp + SPOFF;
 126                         sp = 0;
 127                         if (copyin((void *)(rsp + offsetof(struct frame, fr_fp)),
 128                             &sp, sizeof(sp)) != 0 ||
 129                             copyin((void *)(rsp + offsetof(struct frame, fr_pc)),
 130                             &pc, sizeof(pc)) != 0)
 131                                 break;
 132                 }
 133         }
 134         db_printf("done\n");
 135 }
 136
 137 static int
 138 db_print_trap(struct thread *td, struct trapframe *tf, int count)
 139 {
 140         struct proc *p;
 141         const char *symname;
 142         c_db_sym_t sym;
 143         db_expr_t diff;
 144         db_addr_t func;
 145         db_addr_t tpc;
 146         u_long type;
 147         u_long sfar;
 148         u_long sfsr;
 149         u_long tar;
 150         u_long level;
 151         u_long pil;
 152         u_long code;
 153         u_long o7;
 154         int user;
 155
 156         p = td->td_proc;
 157         type = db_get_value((db_addr_t)&tf->tf_type,
 158             sizeof(tf->tf_type), FALSE);
 159         db_printf("-- %s", trap_msg[type & ~T_KERNEL]);
 160         switch (type & ~T_KERNEL) {
 161         case T_DATA_PROTECTION:
 162                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 163                     sizeof(tf->tf_tar), FALSE);
 164                 db_printf(" tar=%#lx", tar);
 165                 /* fall through */
 166         case T_DATA_EXCEPTION:
 167         case T_INSTRUCTION_EXCEPTION:
 168         case T_MEM_ADDRESS_NOT_ALIGNED:
 169                 sfar = (u_long)db_get_value((db_addr_t)&tf->tf_sfar,
 170                     sizeof(tf->tf_sfar), FALSE);
 171                 sfsr = (u_long)db_get_value((db_addr_t)&tf->tf_sfsr,
 172                     sizeof(tf->tf_sfsr), FALSE);
 173                 db_printf(" sfar=%#lx sfsr=%#lx", sfar, sfsr);
 174                 break;
 175         case T_DATA_MISS:
 176         case T_INSTRUCTION_MISS:
 177                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 178                     sizeof(tf->tf_tar), FALSE);
 179                 db_printf(" tar=%#lx", tar);
 180                 break;
 181         case T_SYSCALL:
 182                 code = db_get_value((db_addr_t)&tf->tf_global[1],
 183                     sizeof(tf->tf_global[1]), FALSE);
 184                 db_printf(" (%ld", code);
 185                 if (code >= 0 && code < p->p_sysent->sv_size) {
 186                         func = (db_addr_t)p->p_sysent->sv_table[code].sy_call;
 187                         sym = db_search_symbol(func, DB_STGY_ANY, &diff);
 188                         if (sym != DB_SYM_NULL && diff == 0) {
 189                                 db_symbol_values(sym, &symname, NULL);
 190                                 db_printf(", %s, %s", p->p_sysent->sv_name,
 191                                     symname);
 192                         }
 193                         db_printf(")");
 194                 }
 195                 break;
 196         case T_INTERRUPT:
 197                 level = (u_long)db_get_value((db_addr_t)&tf->tf_level,
 198                     sizeof(tf->tf_level), FALSE);
 199                 pil = (u_long)db_get_value((db_addr_t)&tf->tf_pil,
 200                     sizeof(tf->tf_pil), FALSE);
 201                 db_printf(" level=%#lx pil=%#lx", level, pil);
 202                 break;
 203         default:
 204                 break;
 205         }
 206         o7 = (u_long)db_get_value((db_addr_t)&tf->tf_out[7],
 207             sizeof(tf->tf_out[7]), FALSE);
 208         db_printf(" %%o7=%#lx --\n", o7);
 209         user = (type & T_KERNEL) == 0;
 210         if (user) {
 211                 tpc = db_get_value((db_addr_t)&tf->tf_tpc,
 212                     sizeof(tf->tf_tpc), FALSE);
 213                 db_printf("userland() at ");
 214                 db_printsym(tpc, DB_STGY_PROC);
 215                 db_printf("\n");
 216                 db_utrace(td, tf, count);
 217         }
 218         return (user);
 219 }
 220
 221 static int
 222 db_backtrace(struct thread *td, struct frame *fp, int count)
 223 {
 224         struct trapframe *tf;
 225         const char *name;
 226         c_db_sym_t sym;
 227         db_expr_t offset;
 228         db_expr_t value;
 229         db_addr_t npc;
 230         db_addr_t pc;
 231         int trap;
 232         int user;
 233
 234         if (count == -1)
 235                 count = 1024;
 236
 237         trap = 0;
 238         user = 0;
 239         npc = 0;
 240         while (count-- && !user && !db_pager_quit) {
 241                 pc = (db_addr_t)db_get_value((db_addr_t)&fp->fr_pc,
 242                     sizeof(fp->fr_pc), FALSE);
 243                 if (trap) {
 244                         pc = npc;
 245                         trap = 0;
 246                 }
 247                 if (!INKERNEL((vm_offset_t)pc))
 248                         break;
 249                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
 250                 if (sym == C_DB_SYM_NULL) {
 251                         value = 0;
 252                         name = NULL;
 253                 } else
 254                         db_symbol_values(sym, &name, &value);
 255                 if (name == NULL)
 256                         name = "(null)";
 257                 fp = (struct frame *)(db_get_value((db_addr_t)&fp->fr_fp,
 258                    sizeof(fp->fr_fp), FALSE) + SPOFF);
 259                 if ((value > (u_long)tl_trap_begin &&
 260                     value < (u_long)tl_trap_end) ||
 261                     (value > (u_long)tl_text_begin &&
 262                     value < (u_long)tl_text_end)) {
 263                         tf = (struct trapframe *)(fp + 1);
 264                         npc = db_get_value((db_addr_t)&tf->tf_tpc,
 265                             sizeof(tf->tf_tpc), FALSE);
 266                         user = db_print_trap(td, tf, count);
 267                         trap = 1;
 268                 } else {
 269                         db_printf("%s() at ", name);
 270                         db_printsym(pc, DB_STGY_PROC);
 271                         db_printf("\n");
 272                 }
 273         }
 274         return (0);
 275 }
 276
 277 void
 278 db_trace_self(void)
 279 {
 280
 281         db_backtrace(curthread,
 282             (struct frame *)__builtin_frame_address(1), -1);
 283 }
 284
 285 int
 286 db_trace_thread(struct thread *td, int count)
 287 {
 288         struct pcb *ctx;
 289
 290         ctx = kdb_thr_ctx(td);
 291         return (db_backtrace(td,
 292             (struct frame *)(ctx->pcb_sp + SPOFF), count));
 293 }