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/proc.h>
  34 #include <sys/stack.h>
  35 #include <sys/sysent.h>
  36
  37 #include <vm/vm.h>
  38 #include <vm/vm_page.h>
  39 #include <vm/vm_map.h>
  40
  41 #include <machine/cpu.h>
  42 #include <machine/pcb.h>
  43 #include <machine/stack.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 static db_varfcn_t db_frame;
  54
  55 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
  56 struct  db_variable db_regs[] = {
  57         { "g0",         DB_OFFSET(tf_global[0]),        db_frame },
  58         { "g1",         DB_OFFSET(tf_global[1]),        db_frame },
  59         { "g2",         DB_OFFSET(tf_global[2]),        db_frame },
  60         { "g3",         DB_OFFSET(tf_global[3]),        db_frame },
  61         { "g4",         DB_OFFSET(tf_global[4]),        db_frame },
  62         { "g5",         DB_OFFSET(tf_global[5]),        db_frame },
  63         { "g6",         DB_OFFSET(tf_global[6]),        db_frame },
  64         { "g7",         DB_OFFSET(tf_global[7]),        db_frame },
  65         { "i0",         DB_OFFSET(tf_out[0]),           db_frame },
  66         { "i1",         DB_OFFSET(tf_out[1]),           db_frame },
  67         { "i2",         DB_OFFSET(tf_out[2]),           db_frame },
  68         { "i3",         DB_OFFSET(tf_out[3]),           db_frame },
  69         { "i4",         DB_OFFSET(tf_out[4]),           db_frame },
  70         { "i5",         DB_OFFSET(tf_out[5]),           db_frame },
  71         { "i6",         DB_OFFSET(tf_out[6]),           db_frame },
  72         { "i7",         DB_OFFSET(tf_out[7]),           db_frame },
  73         { "tnpc",       DB_OFFSET(tf_tnpc),             db_frame },
  74         { "tpc",        DB_OFFSET(tf_tpc),              db_frame },
  75         { "tstate",     DB_OFFSET(tf_tstate),           db_frame },
  76 };
  77 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
  78
  79 static int
  80 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  81 {
  82         uint64_t *reg;
  83
  84         if (kdb_frame == NULL)
  85                 return (0);
  86         reg = (uint64_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
  87         if (op == DB_VAR_GET)
  88                 *valuep = *reg;
  89         else
  90                 *reg = *valuep;
  91         return (1);
  92 }
  93
  94 /*
  95  * User stack trace (debugging aid).
  96  */
  97 static void
  98 db_utrace(struct thread *td, struct trapframe *tf, int count)
  99 {
 100         struct pcb *pcb;
 101         db_addr_t sp, rsp, o7, pc;
 102         int i, found;
 103
 104         pcb = td->td_pcb;
 105         sp = db_get_value((db_addr_t)&tf->tf_sp, sizeof(tf->tf_sp), FALSE);
 106         o7 = db_get_value((db_addr_t)&tf->tf_out[7], sizeof(tf->tf_out[7]),
 107             FALSE);
 108         pc = db_get_value((db_addr_t)&tf->tf_tpc, sizeof(tf->tf_tpc), FALSE);
 109         db_printf("user trace: trap %%o7=%#lx\n", o7);
 110         while (count-- && sp != 0 && !db_pager_quit) {
 111                 db_printf("pc %#lx, sp %#lx\n", pc, sp);
 112                 /* First, check whether the frame is in the pcb. */
 113                 found = 0;
 114                 for (i = 0; i < pcb->pcb_nsaved; i++) {
 115                         if (pcb->pcb_rwsp[i] == sp) {
 116                                 found = 1;
 117                                 sp = pcb->pcb_rw[i].rw_in[6];
 118                                 pc = pcb->pcb_rw[i].rw_in[7];
 119                                 break;
 120                         }
 121                 }
 122                 if (!found) {
 123                         rsp = sp + SPOFF;
 124                         sp = 0;
 125                         if (copyin((void *)(rsp + offsetof(struct frame, fr_fp)),
 126                             &sp, sizeof(sp)) != 0 ||
 127                             copyin((void *)(rsp + offsetof(struct frame, fr_pc)),
 128                             &pc, sizeof(pc)) != 0)
 129                                 break;
 130                 }
 131         }
 132         db_printf("done\n");
 133 }
 134
 135 static int
 136 db_print_trap(struct thread *td, struct trapframe *tf, int count)
 137 {
 138         struct proc *p;
 139         const char *symname;
 140         c_db_sym_t sym;
 141         db_expr_t diff;
 142         db_addr_t func;
 143         db_addr_t tpc;
 144         u_long type;
 145         u_long sfar;
 146         u_long sfsr;
 147         u_long tar;
 148         u_long level;
 149         u_long pil;
 150         u_long code;
 151         u_long o7;
 152         int user;
 153
 154         p = td->td_proc;
 155         type = db_get_value((db_addr_t)&tf->tf_type,
 156             sizeof(tf->tf_type), FALSE);
 157         db_printf("-- %s", trap_msg[type & ~T_KERNEL]);
 158         switch (type & ~T_KERNEL) {
 159         case T_DATA_PROTECTION:
 160                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 161                     sizeof(tf->tf_tar), FALSE);
 162                 db_printf(" tar=%#lx", tar);
 163                 /* fall through */
 164         case T_DATA_EXCEPTION:
 165         case T_INSTRUCTION_EXCEPTION:
 166         case T_MEM_ADDRESS_NOT_ALIGNED:
 167                 sfar = (u_long)db_get_value((db_addr_t)&tf->tf_sfar,
 168                     sizeof(tf->tf_sfar), FALSE);
 169                 sfsr = (u_long)db_get_value((db_addr_t)&tf->tf_sfsr,
 170                     sizeof(tf->tf_sfsr), FALSE);
 171                 db_printf(" sfar=%#lx sfsr=%#lx", sfar, sfsr);
 172                 break;
 173         case T_DATA_MISS:
 174         case T_INSTRUCTION_MISS:
 175                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 176                     sizeof(tf->tf_tar), FALSE);
 177                 db_printf(" tar=%#lx", tar);
 178                 break;
 179         case T_SYSCALL:
 180                 code = db_get_value((db_addr_t)&tf->tf_global[1],
 181                     sizeof(tf->tf_global[1]), FALSE);
 182                 db_printf(" (%ld", code);
 183                 if (code >= 0 && code < p->p_sysent->sv_size) {
 184                         func = (db_addr_t)p->p_sysent->sv_table[code].sy_call;
 185                         sym = db_search_symbol(func, DB_STGY_ANY, &diff);
 186                         if (sym != DB_SYM_NULL && diff == 0) {
 187                                 db_symbol_values(sym, &symname, NULL);
 188                                 db_printf(", %s, %s", p->p_sysent->sv_name,
 189                                     symname);
 190                         }
 191                         db_printf(")");
 192                 }
 193                 break;
 194         case T_INTERRUPT:
 195                 level = (u_long)db_get_value((db_addr_t)&tf->tf_level,
 196                     sizeof(tf->tf_level), FALSE);
 197                 pil = (u_long)db_get_value((db_addr_t)&tf->tf_pil,
 198                     sizeof(tf->tf_pil), FALSE);
 199                 db_printf(" level=%#lx pil=%#lx", level, pil);
 200                 break;
 201         default:
 202                 break;
 203         }
 204         o7 = (u_long)db_get_value((db_addr_t)&tf->tf_out[7],
 205             sizeof(tf->tf_out[7]), FALSE);
 206         db_printf(" %%o7=%#lx --\n", o7);
 207         user = (type & T_KERNEL) == 0;
 208         if (user) {
 209                 tpc = db_get_value((db_addr_t)&tf->tf_tpc,
 210                     sizeof(tf->tf_tpc), FALSE);
 211                 db_printf("userland() at ");
 212                 db_printsym(tpc, DB_STGY_PROC);
 213                 db_printf("\n");
 214                 db_utrace(td, tf, count);
 215         }
 216         return (user);
 217 }
 218
 219 static int
 220 db_backtrace(struct thread *td, struct frame *fp, int count)
 221 {
 222         struct trapframe *tf;
 223         const char *name;
 224         c_db_sym_t sym;
 225         db_expr_t offset;
 226         db_expr_t value;
 227         db_addr_t npc;
 228         db_addr_t pc;
 229         int trap;
 230         int user;
 231
 232         if (count == -1)
 233                 count = 1024;
 234
 235         trap = 0;
 236         user = 0;
 237         npc = 0;
 238         while (count-- && !user && !db_pager_quit) {
 239                 pc = (db_addr_t)db_get_value((db_addr_t)&fp->fr_pc,
 240                     sizeof(fp->fr_pc), FALSE);
 241                 if (trap) {
 242                         pc = npc;
 243                         trap = 0;
 244                 }
 245                 if (!INKERNEL((vm_offset_t)pc))
 246                         break;
 247                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
 248                 if (sym == C_DB_SYM_NULL) {
 249                         value = 0;
 250                         name = NULL;
 251                 } else
 252                         db_symbol_values(sym, &name, &value);
 253                 if (name == NULL)
 254                         name = "(null)";
 255                 fp = (struct frame *)(db_get_value((db_addr_t)&fp->fr_fp,
 256                    sizeof(fp->fr_fp), FALSE) + SPOFF);
 257                 if ((value > (u_long)tl_trap_begin &&
 258                     value < (u_long)tl_trap_end) ||
 259                     (value > (u_long)tl_text_begin &&
 260                     value < (u_long)tl_text_end)) {
 261                         tf = (struct trapframe *)(fp + 1);
 262                         npc = db_get_value((db_addr_t)&tf->tf_tpc,
 263                             sizeof(tf->tf_tpc), FALSE);
 264                         user = db_print_trap(td, tf, count);
 265                         trap = 1;
 266                 } else {
 267                         db_printf("%s() at ", name);
 268                         db_printsym(pc, DB_STGY_PROC);
 269                         db_printf("\n");
 270                 }
 271         }
 272         return (0);
 273 }
 274
 275 void
 276 db_trace_self(void)
 277 {
 278
 279         db_backtrace(curthread,
 280             (struct frame *)__builtin_frame_address(1), -1);
 281 }
 282
 283 int
 284 db_trace_thread(struct thread *td, int count)
 285 {
 286         struct pcb *ctx;
 287
 288         ctx = kdb_thr_ctx(td);
 289         return (db_backtrace(td,
 290             (struct frame *)(ctx->pcb_sp + SPOFF), count));
 291 }