6/sys/sparc64/sparc64/db_trace.c

   1 /*-
   2  * Copyright (c) 2001 Jake Burkholder.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/kdb.h>
  33 #include <sys/linker_set.h>
  34 #include <sys/proc.h>
  35 #include <sys/stack.h>
  36 #include <sys/sysent.h>
  37
  38 #include <vm/vm.h>
  39 #include <vm/vm_page.h>
  40 #include <vm/vm_map.h>
  41
  42 #include <machine/cpu.h>
  43 #include <machine/pcb.h>
  44 #include <machine/trap.h>
  45 #include <machine/vmparam.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 #include <ddb/db_watch.h>
  52
  53 extern char tl_trap_begin[];
  54 extern char tl_trap_end[];
  55 extern char tl_text_begin[];
  56 extern char tl_text_end[];
  57
  58 #define INKERNEL(va) \
  59         ((va) >= VM_MIN_KERNEL_ADDRESS && (va) <= VM_MAX_KERNEL_ADDRESS)
  60
  61 static db_varfcn_t db_frame;
  62
  63 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
  64 struct  db_variable db_regs[] = {
  65         { "g0",         DB_OFFSET(tf_global[0]),        db_frame },
  66         { "g1",         DB_OFFSET(tf_global[1]),        db_frame },
  67         { "g2",         DB_OFFSET(tf_global[2]),        db_frame },
  68         { "g3",         DB_OFFSET(tf_global[3]),        db_frame },
  69         { "g4",         DB_OFFSET(tf_global[4]),        db_frame },
  70         { "g5",         DB_OFFSET(tf_global[5]),        db_frame },
  71         { "g6",         DB_OFFSET(tf_global[6]),        db_frame },
  72         { "g7",         DB_OFFSET(tf_global[7]),        db_frame },
  73         { "i0",         DB_OFFSET(tf_out[0]),           db_frame },
  74         { "i1",         DB_OFFSET(tf_out[1]),           db_frame },
  75         { "i2",         DB_OFFSET(tf_out[2]),           db_frame },
  76         { "i3",         DB_OFFSET(tf_out[3]),           db_frame },
  77         { "i4",         DB_OFFSET(tf_out[4]),           db_frame },
  78         { "i5",         DB_OFFSET(tf_out[5]),           db_frame },
  79         { "i6",         DB_OFFSET(tf_out[6]),           db_frame },
  80         { "i7",         DB_OFFSET(tf_out[7]),           db_frame },
  81         { "tnpc",       DB_OFFSET(tf_tnpc),             db_frame },
  82         { "tpc",        DB_OFFSET(tf_tpc),              db_frame },
  83         { "tstate",     DB_OFFSET(tf_tstate),           db_frame },
  84 };
  85 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
  86
  87 static int
  88 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  89 {
  90         uint64_t *reg;
  91
  92         if (kdb_frame == NULL)
  93                 return (0);
  94         reg = (uint64_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
  95         if (op == DB_VAR_GET)
  96                 *valuep = *reg;
  97         else
  98                 *reg = *valuep;
  99         return (1);
 100 }
 101
 102 /*
 103  * User stack trace (debugging aid).
 104  */
 105 static void
 106 db_utrace(struct thread *td, struct trapframe *tf, int count, int *quitp)
 107 {
 108         struct pcb *pcb;
 109         db_addr_t sp, rsp, o7, pc;
 110         int i, found;
 111
 112         pcb = td->td_pcb;
 113         sp = db_get_value((db_addr_t)&tf->tf_sp, sizeof(tf->tf_sp), FALSE);
 114         o7 = db_get_value((db_addr_t)&tf->tf_out[7], sizeof(tf->tf_out[7]),
 115             FALSE);
 116         pc = db_get_value((db_addr_t)&tf->tf_tpc, sizeof(tf->tf_tpc), FALSE);
 117         db_printf("user trace: trap %%o7=%#lx\n", o7);
 118         while (count-- && sp != 0 && !*quitp) {
 119                 db_printf("pc %#lx, sp %#lx\n", pc, sp);
 120                 /* First, check whether the frame is in the pcb. */
 121                 found = 0;
 122                 for (i = 0; i < pcb->pcb_nsaved; i++) {
 123                         if (pcb->pcb_rwsp[i] == sp) {
 124                                 found = 1;
 125                                 sp = pcb->pcb_rw[i].rw_in[6];
 126                                 pc = pcb->pcb_rw[i].rw_in[7];
 127                                 break;
 128                         }
 129                 }
 130                 if (!found) {
 131                         rsp = sp + SPOFF;
 132                         sp = 0;
 133                         if (copyin((void *)(rsp + offsetof(struct frame, fr_fp)),
 134                             &sp, sizeof(sp)) != 0 ||
 135                             copyin((void *)(rsp + offsetof(struct frame, fr_pc)),
 136                             &pc, sizeof(pc)) != 0)
 137                                 break;
 138                 }
 139         }
 140         db_printf("done\n");
 141 }
 142
 143 static int
 144 db_print_trap(struct thread *td, struct trapframe *tf, int count, int *quitp)
 145 {
 146         struct proc *p;
 147         const char *symname;
 148         c_db_sym_t sym;
 149         db_expr_t diff;
 150         db_addr_t func;
 151         db_addr_t tpc;
 152         u_long type;
 153         u_long sfar;
 154         u_long sfsr;
 155         u_long tar;
 156         u_long level;
 157         u_long pil;
 158         u_long code;
 159         u_long o7;
 160         int user;
 161
 162         p = td->td_proc;
 163         type = db_get_value((db_addr_t)&tf->tf_type,
 164             sizeof(tf->tf_type), FALSE);
 165         db_printf("-- %s", trap_msg[type & ~T_KERNEL]);
 166         switch (type & ~T_KERNEL) {
 167         case T_DATA_PROTECTION:
 168                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 169                     sizeof(tf->tf_tar), FALSE);
 170                 db_printf(" tar=%#lx", tar);
 171                 /* fall through */
 172         case T_DATA_EXCEPTION:
 173         case T_INSTRUCTION_EXCEPTION:
 174         case T_MEM_ADDRESS_NOT_ALIGNED:
 175                 sfar = (u_long)db_get_value((db_addr_t)&tf->tf_sfar,
 176                     sizeof(tf->tf_sfar), FALSE);
 177                 sfsr = (u_long)db_get_value((db_addr_t)&tf->tf_sfsr,
 178                     sizeof(tf->tf_sfsr), FALSE);
 179                 db_printf(" sfar=%#lx sfsr=%#lx", sfar, sfsr);
 180                 break;
 181         case T_DATA_MISS:
 182         case T_INSTRUCTION_MISS:
 183                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 184                     sizeof(tf->tf_tar), FALSE);
 185                 db_printf(" tar=%#lx", tar);
 186                 break;
 187         case T_SYSCALL:
 188                 code = db_get_value((db_addr_t)&tf->tf_global[1],
 189                     sizeof(tf->tf_global[1]), FALSE);
 190                 db_printf(" (%ld", code);
 191                 if (code >= 0 && code < p->p_sysent->sv_size) {
 192                         func = (db_addr_t)p->p_sysent->sv_table[code].sy_call;
 193                         sym = db_search_symbol(func, DB_STGY_ANY, &diff);
 194                         if (sym != DB_SYM_NULL && diff == 0) {
 195                                 db_symbol_values(sym, &symname, NULL);
 196                                 db_printf(", %s, %s", p->p_sysent->sv_name,
 197                                     symname);
 198                         }
 199                         db_printf(")");
 200                 }
 201                 break;
 202         case T_INTERRUPT:
 203                 level = (u_long)db_get_value((db_addr_t)&tf->tf_level,
 204                     sizeof(tf->tf_level), FALSE);
 205                 pil = (u_long)db_get_value((db_addr_t)&tf->tf_pil,
 206                     sizeof(tf->tf_pil), FALSE);
 207                 db_printf(" level=%#lx pil=%#lx", level, pil);
 208                 break;
 209         default:
 210                 break;
 211         }
 212         o7 = (u_long)db_get_value((db_addr_t)&tf->tf_out[7],
 213             sizeof(tf->tf_out[7]), FALSE);
 214         db_printf(" %%o7=%#lx --\n", o7);
 215         user = (type & T_KERNEL) == 0;
 216         if (user) {
 217                 tpc = db_get_value((db_addr_t)&tf->tf_tpc,
 218                     sizeof(tf->tf_tpc), FALSE);
 219                 db_printf("userland() at ");
 220                 db_printsym(tpc, DB_STGY_PROC);
 221                 db_printf("\n");
 222                 db_utrace(td, tf, count, quitp);
 223         }
 224         return (user);
 225 }
 226
 227 static int
 228 db_backtrace(struct thread *td, struct frame *fp, int count)
 229 {
 230         struct trapframe *tf;
 231         const char *name;
 232         c_db_sym_t sym;
 233         db_expr_t offset;
 234         db_expr_t value;
 235         db_addr_t npc;
 236         db_addr_t pc;
 237         int trap;
 238         int user;
 239         int quit;
 240
 241         if (count == -1)
 242                 count = 1024;
 243
 244         trap = 0;
 245         user = 0;
 246         npc = 0;
 247         quit = 0;
 248         db_setup_paging(db_simple_pager, &quit, db_lines_per_page);
 249         while (count-- && !user && !quit) {
 250                 pc = (db_addr_t)db_get_value((db_addr_t)&fp->fr_pc,
 251                     sizeof(fp->fr_pc), FALSE);
 252                 if (trap) {
 253                         pc = npc;
 254                         trap = 0;
 255                 }
 256                 if (!INKERNEL((vm_offset_t)pc))
 257                         break;
 258                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
 259                 if (sym == C_DB_SYM_NULL) {
 260                         value = 0;
 261                         name = NULL;
 262                 } else
 263                         db_symbol_values(sym, &name, &value);
 264                 if (name == NULL)
 265                         name = "(null)";
 266                 fp = (struct frame *)(db_get_value((db_addr_t)&fp->fr_fp,
 267                    sizeof(fp->fr_fp), FALSE) + SPOFF);
 268                 if ((value > (u_long)tl_trap_begin &&
 269                     value < (u_long)tl_trap_end) ||
 270                     (value > (u_long)tl_text_begin &&
 271                     value < (u_long)tl_text_end)) {
 272                         tf = (struct trapframe *)(fp + 1);
 273                         npc = db_get_value((db_addr_t)&tf->tf_tpc,
 274                             sizeof(tf->tf_tpc), FALSE);
 275                         user = db_print_trap(td, tf, count, &quit);
 276                         trap = 1;
 277                 } else {
 278                         db_printf("%s() at ", name);
 279                         db_printsym(pc, DB_STGY_PROC);
 280                         db_printf("\n");
 281                 }
 282         }
 283         return (0);
 284 }
 285
 286 void
 287 db_trace_self(void)
 288 {
 289         db_expr_t addr;
 290
 291         addr = (db_expr_t)__builtin_frame_address(1);
 292         db_backtrace(curthread, (struct frame *)(addr + SPOFF), -1);
 293 }
 294
 295 int
 296 db_trace_thread(struct thread *td, int count)
 297 {
 298         struct pcb *ctx;
 299
 300         ctx = kdb_thr_ctx(td);
 301         return (db_backtrace(td, (struct frame*)(ctx->pcb_sp + SPOFF), count));
 302 }
 303
 304 void
 305 stack_save(struct stack *st)
 306 {
 307         struct frame *fp;
 308         db_expr_t addr;
 309         vm_offset_t callpc;
 310
 311         stack_zero(st);
 312         addr = (db_expr_t)__builtin_frame_address(1);
 313         fp = (struct frame *)(addr + SPOFF);
 314         while (1) {
 315                 callpc = fp->fr_pc;
 316                 if (!INKERNEL(callpc))
 317                         break;
 318                 /* Don't bother traversing trap frames. */
 319                 if ((callpc > (u_long)tl_trap_begin &&
 320                     callpc < (u_long)tl_trap_end) ||
 321                     (callpc > (u_long)tl_text_begin &&
 322                     callpc < (u_long)tl_text_end))
 323                         break;
 324                 if (stack_put(st, callpc) == -1)
 325                         break;
 326                 fp = (struct frame *)(fp->fr_fp + SPOFF);
 327         }
 328 }