sys/sun4v/sun4v/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/stack.h>
  45 #include <machine/trap.h>
  46 #include <machine/vmparam.h>
  47
  48 #include <ddb/ddb.h>
  49 #include <ddb/db_access.h>
  50 #include <ddb/db_sym.h>
  51 #include <ddb/db_variables.h>
  52 #include <ddb/db_watch.h>
  53
  54 static db_varfcn_t db_frame;
  55
  56 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
  57 struct  db_variable db_regs[] = {
  58         { "g0",         DB_OFFSET(tf_global[0]),        db_frame },
  59         { "g1",         DB_OFFSET(tf_global[1]),        db_frame },
  60         { "g2",         DB_OFFSET(tf_global[2]),        db_frame },
  61         { "g3",         DB_OFFSET(tf_global[3]),        db_frame },
  62         { "g4",         DB_OFFSET(tf_global[4]),        db_frame },
  63         { "g5",         DB_OFFSET(tf_global[5]),        db_frame },
  64         { "g6",         DB_OFFSET(tf_global[6]),        db_frame },
  65         { "g7",         DB_OFFSET(tf_global[7]),        db_frame },
  66         { "i0",         DB_OFFSET(tf_out[0]),           db_frame },
  67         { "i1",         DB_OFFSET(tf_out[1]),           db_frame },
  68         { "i2",         DB_OFFSET(tf_out[2]),           db_frame },
  69         { "i3",         DB_OFFSET(tf_out[3]),           db_frame },
  70         { "i4",         DB_OFFSET(tf_out[4]),           db_frame },
  71         { "i5",         DB_OFFSET(tf_out[5]),           db_frame },
  72         { "i6",         DB_OFFSET(tf_out[6]),           db_frame },
  73         { "i7",         DB_OFFSET(tf_out[7]),           db_frame },
  74         { "tnpc",       DB_OFFSET(tf_tnpc),             db_frame },
  75         { "tpc",        DB_OFFSET(tf_tpc),              db_frame },
  76         { "tstate",     DB_OFFSET(tf_tstate),           db_frame },
  77 };
  78 struct db_variable *db_eregs = db_regs + sizeof(db_regs)/sizeof(db_regs[0]);
  79
  80 static int
  81 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
  82 {
  83         uint64_t *reg;
  84
  85         if (kdb_frame == NULL)
  86                 return (0);
  87         reg = (uint64_t*)((uintptr_t)kdb_frame + (uintptr_t)vp->valuep);
  88         if (op == DB_VAR_GET)
  89                 *valuep = *reg;
  90         else
  91                 *reg = *valuep;
  92         return (1);
  93 }
  94
  95 /*
  96  * User stack trace (debugging aid).
  97  */
  98 static void
  99 db_utrace(struct thread *td, struct trapframe *tf, int count)
 100 {
 101         struct pcb *pcb;
 102         db_addr_t sp, rsp, o7, pc;
 103         int i, found;
 104
 105         pcb = td->td_pcb;
 106         sp = db_get_value((db_addr_t)&tf->tf_sp, sizeof(tf->tf_sp), FALSE);
 107         o7 = db_get_value((db_addr_t)&tf->tf_out[7], sizeof(tf->tf_out[7]),
 108             FALSE);
 109         pc = db_get_value((db_addr_t)&tf->tf_tpc, sizeof(tf->tf_tpc), FALSE);
 110         db_printf("user trace: trap %%o7=%#lx\n", o7);
 111         while (count-- && sp != 0 && !db_pager_quit) {
 112                 db_printf("pc %#lx, sp %#lx\n", pc, sp);
 113                 /* First, check whether the frame is in the pcb. */
 114                 found = 0;
 115                 for (i = 0; i < pcb->pcb_nsaved; i++) {
 116                         if (pcb->pcb_rwsp[i] == sp) {
 117                                 found = 1;
 118                                 sp = pcb->pcb_rw[i].rw_in[6];
 119                                 pc = pcb->pcb_rw[i].rw_in[7];
 120                                 break;
 121                         }
 122                 }
 123                 if (!found) {
 124                         rsp = sp + SPOFF;
 125                         sp = 0;
 126                         if (copyin((void *)(rsp + offsetof(struct frame, fr_fp)),
 127                             &sp, sizeof(sp)) != 0 ||
 128                             copyin((void *)(rsp + offsetof(struct frame, fr_pc)),
 129                             &pc, sizeof(pc)) != 0)
 130                                 break;
 131                 }
 132         }
 133         db_printf("done\n");
 134 }
 135
 136 static int
 137 db_print_trap(struct thread *td, struct trapframe *tf, int count)
 138 {
 139         struct proc *p;
 140         const char *symname;
 141         c_db_sym_t sym;
 142         db_expr_t diff;
 143         db_addr_t func;
 144         db_addr_t tpc;
 145         u_long type;
 146 #if 0
 147         u_long sfar;
 148         u_long sfsr;
 149         u_long tar;
 150         u_long level;
 151         u_long pil;
 152 #endif
 153         u_long code;
 154         u_long o7;
 155         int user;
 156
 157         type = 5;
 158         p = td->td_proc;
 159 #if 0
 160         type = db_get_value((db_addr_t)&tf->tf_type,
 161             sizeof(tf->tf_type), FALSE);
 162         db_printf("-- %s", trap_msg[type & ~T_KERNEL]);
 163 #endif
 164         switch (type & ~T_KERNEL) {
 165         case T_DATA_PROTECTION:
 166 #if 0
 167                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 168                     sizeof(tf->tf_tar), FALSE);
 169                 db_printf(" tar=%#lx", tar);
 170 #endif
 171                 /* fall through */
 172         case T_DATA_EXCEPTION:
 173         case T_INSTRUCTION_EXCEPTION:
 174         case T_MEM_ADDRESS_NOT_ALIGNED:
 175 #if 0
 176                 sfar = (u_long)db_get_value((db_addr_t)&tf->tf_sfar,
 177                     sizeof(tf->tf_sfar), FALSE);
 178                 sfsr = (u_long)db_get_value((db_addr_t)&tf->tf_sfsr,
 179                     sizeof(tf->tf_sfsr), FALSE);
 180                 db_printf(" sfar=%#lx sfsr=%#lx", sfar, sfsr);
 181 #endif
 182                 break;
 183         case T_DATA_MISS:
 184         case T_INSTRUCTION_MISS:
 185 #if 0
 186                 tar = (u_long)db_get_value((db_addr_t)&tf->tf_tar,
 187                     sizeof(tf->tf_tar), FALSE);
 188                 db_printf(" tar=%#lx", tar);
 189 #endif
 190                 break;
 191         case T_SYSCALL:
 192                 code = db_get_value((db_addr_t)&tf->tf_global[1],
 193                     sizeof(tf->tf_global[1]), FALSE);
 194                 db_printf(" (%ld", code);
 195                 if (code >= 0 && code < p->p_sysent->sv_size) {
 196                         func = (db_addr_t)p->p_sysent->sv_table[code].sy_call;
 197                         sym = db_search_symbol(func, DB_STGY_ANY, &diff);
 198                         if (sym != DB_SYM_NULL && diff == 0) {
 199                                 db_symbol_values(sym, &symname, NULL);
 200                                 db_printf(", %s, %s", p->p_sysent->sv_name,
 201                                     symname);
 202                         }
 203                         db_printf(")");
 204                 }
 205                 break;
 206         case T_INTERRUPT:
 207 #if 0
 208                 level = (u_long)db_get_value((db_addr_t)&tf->tf_level,
 209                     sizeof(tf->tf_level), FALSE);
 210                 pil = (u_long)db_get_value((db_addr_t)&tf->tf_pil,
 211                     sizeof(tf->tf_pil), FALSE);
 212                 db_printf(" level=%#lx pil=%#lx", level, pil);
 213 #endif
 214                 break;
 215         default:
 216                 break;
 217         }
 218         o7 = (u_long)db_get_value((db_addr_t)&tf->tf_out[7],
 219             sizeof(tf->tf_out[7]), FALSE);
 220         db_printf(" %%o7=%#lx --\n", o7);
 221         user = (type & T_KERNEL) == 0;
 222         if (user) {
 223                 tpc = db_get_value((db_addr_t)&tf->tf_tpc,
 224                     sizeof(tf->tf_tpc), FALSE);
 225                 db_printf("userland() at ");
 226                 db_printsym(tpc, DB_STGY_PROC);
 227                 db_printf("\n");
 228                 db_utrace(td, tf, count);
 229         }
 230         return (user);
 231 }
 232
 233 static int
 234 db_backtrace(struct thread *td, struct frame *fp, int count)
 235 {
 236         struct trapframe *tf;
 237         const char *name;
 238         c_db_sym_t sym;
 239         db_expr_t offset;
 240         db_expr_t value;
 241         db_addr_t npc;
 242         db_addr_t pc;
 243         int trap;
 244         int user;
 245
 246         if (count == -1)
 247                 count = 1024;
 248
 249         trap = 0;
 250         user = 0;
 251         npc = 0;
 252         while (count-- && !user && !db_pager_quit) {
 253                 pc = (db_addr_t)db_get_value((db_addr_t)&fp->fr_pc,
 254                     sizeof(fp->fr_pc), FALSE);
 255                 if (trap) {
 256                         pc = npc;
 257                         trap = 0;
 258                 }
 259                 if (!INKERNEL((vm_offset_t)pc))
 260                         break;
 261                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
 262                 if (sym == C_DB_SYM_NULL) {
 263                         value = 0;
 264                         name = NULL;
 265                 } else
 266                         db_symbol_values(sym, &name, &value);
 267                 if (name == NULL)
 268                         name = "(null)";
 269                 fp = (struct frame *)(db_get_value((db_addr_t)&fp->fr_fp,
 270                    sizeof(fp->fr_fp), FALSE) + SPOFF);
 271                 if (bcmp(name, "tl0_", 4) == 0 ||
 272                     bcmp(name, "tl1_", 4) == 0) {
 273                         tf = (struct trapframe *)(fp + 1);
 274                         npc = db_get_value((db_addr_t)&tf->tf_tpc,
 275                             sizeof(tf->tf_tpc), FALSE);
 276                         user = db_print_trap(td, tf, count);
 277                         trap = 1;
 278                 } else {
 279                         db_printf("%s() at ", name);
 280                         db_printsym(pc, DB_STGY_PROC);
 281                         db_printf("\n");
 282                 }
 283         }
 284         return (0);
 285 }
 286
 287 void
 288 db_trace_self(void)
 289 {
 290
 291         db_backtrace(curthread,
 292             (struct frame *)__builtin_frame_address(1), -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,
 302             (struct frame *)(ctx->pcb_sp + SPOFF), count));
 303 }