sys/arm/arm/db_trace.c

   1 /*      $NetBSD: db_trace.c,v 1.8 2003/01/17 22:28:48 thorpej Exp $     */
   2
   3 /*-
   4  * Copyright (c) 2000, 2001 Ben Harris
   5  * Copyright (c) 1996 Scott K. Stevens
   6  *
   7  * Mach Operating System
   8  * Copyright (c) 1991,1990 Carnegie Mellon University
   9  * All Rights Reserved.
  10  *
  11  * Permission to use, copy, modify and distribute this software and its
  12  * documentation is hereby granted, provided that both the copyright
  13  * notice and this permission notice appear in all copies of the
  14  * software, derivative works or modified versions, and any portions
  15  * thereof, and that both notices appear in supporting documentation.
  16  *
  17  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  18  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  19  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  20  *
  21  * Carnegie Mellon requests users of this software to return to
  22  *
  23  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  24  *  School of Computer Science
  25  *  Carnegie Mellon University
  26  *  Pittsburgh PA 15213-3890
  27  *
  28  * any improvements or extensions that they make and grant Carnegie the
  29  * rights to redistribute these changes.
  30  */
  31 #include "opt_ddb.h"
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37
  38 #include <sys/proc.h>
  39 #include <sys/kdb.h>
  40 #include <sys/stack.h>
  41
  42 #include <machine/armreg.h>
  43 #include <machine/asm.h>
  44 #include <machine/cpufunc.h>
  45 #include <machine/db_machdep.h>
  46 #include <machine/debug_monitor.h>
  47 #include <machine/pcb.h>
  48 #include <machine/stack.h>
  49 #include <machine/vmparam.h>
  50
  51 #include <ddb/ddb.h>
  52 #include <ddb/db_access.h>
  53 #include <ddb/db_sym.h>
  54 #include <ddb/db_output.h>
  55
  56 static void
  57 db_stack_trace_cmd(struct unwind_state *state)
  58 {
  59         const char *name;
  60         db_expr_t value;
  61         db_expr_t offset;
  62         c_db_sym_t sym;
  63         u_int reg, i;
  64         char *sep;
  65         uint16_t upd_mask;
  66         bool finished;
  67
  68         finished = false;
  69         while (!finished) {
  70                 finished = unwind_stack_one(state, 1);
  71
  72                 /* Print the frame details */
  73                 sym = db_search_symbol(state->start_pc, DB_STGY_ANY, &offset);
  74                 if (sym == C_DB_SYM_NULL) {
  75                         value = 0;
  76                         name = "(null)";
  77                 } else
  78                         db_symbol_values(sym, &name, &value);
  79                 db_printf("%s() at ", name);
  80                 db_printsym(state->start_pc, DB_STGY_PROC);
  81                 db_printf("\n");
  82                 db_printf("\t pc = 0x%08x  lr = 0x%08x (", state->start_pc,
  83                     state->registers[LR]);
  84                 db_printsym(state->registers[LR], DB_STGY_PROC);
  85                 db_printf(")\n");
  86                 db_printf("\t sp = 0x%08x  fp = 0x%08x",
  87                     state->registers[SP], state->registers[FP]);
  88
  89                 /* Don't print the registers we have already printed */
  90                 upd_mask = state->update_mask &
  91                     ~((1 << SP) | (1 << FP) | (1 << LR) | (1 << PC));
  92                 sep = "\n\t";
  93                 for (i = 0, reg = 0; upd_mask != 0; upd_mask >>= 1, reg++) {
  94                         if ((upd_mask & 1) != 0) {
  95                                 db_printf("%s%sr%d = 0x%08x", sep,
  96                                     (reg < 10) ? " " : "", reg,
  97                                     state->registers[reg]);
  98                                 i++;
  99                                 if (i == 2) {
 100                                         sep = "\n\t";
 101                                         i = 0;
 102                                 } else
 103                                         sep = " ";
 104                         }
 105                 }
 106                 db_printf("\n");
 107
 108                 if (finished)
 109                         break;
 110
 111                 /*
 112                  * Stop if directed to do so, or if we've unwound back to the
 113                  * kernel entry point, or if the unwind function didn't change
 114                  * anything (to avoid getting stuck in this loop forever).
 115                  * If the latter happens, it's an indication that the unwind
 116                  * information is incorrect somehow for the function named in
 117                  * the last frame printed before you see the unwind failure
 118                  * message (maybe it needs a STOP_UNWINDING).
 119                  */
 120                 if (state->registers[PC] < VM_MIN_KERNEL_ADDRESS) {
 121                         db_printf("Unable to unwind into user mode\n");
 122                         finished = true;
 123                 } else if (state->update_mask == 0) {
 124                         db_printf("Unwind failure (no registers changed)\n");
 125                         finished = true;
 126                 }
 127         }
 128 }
 129
 130 void
 131 db_md_list_watchpoints(void)
 132 {
 133
 134         dbg_show_watchpoint();
 135 }
 136
 137 int
 138 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
 139 {
 140
 141         return (dbg_remove_watchpoint(addr, size));
 142 }
 143
 144 int
 145 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
 146 {
 147
 148         return (dbg_setup_watchpoint(addr, size, HW_WATCHPOINT_RW));
 149 }
 150
 151 int
 152 db_trace_thread(struct thread *thr, int count)
 153 {
 154         struct unwind_state state;
 155         struct pcb *ctx;
 156
 157         if (thr != curthread) {
 158                 ctx = kdb_thr_ctx(thr);
 159
 160                 state.registers[FP] = ctx->pcb_regs.sf_r11;
 161                 state.registers[SP] = ctx->pcb_regs.sf_sp;
 162                 state.registers[LR] = ctx->pcb_regs.sf_lr;
 163                 state.registers[PC] = ctx->pcb_regs.sf_pc;
 164
 165                 db_stack_trace_cmd(&state);
 166         } else
 167                 db_trace_self();
 168         return (0);
 169 }
 170
 171 void
 172 db_trace_self(void)
 173 {
 174         struct unwind_state state;
 175         uint32_t sp;
 176
 177         /* Read the stack pointer */
 178         __asm __volatile("mov %0, sp" : "=&r" (sp));
 179
 180         state.registers[FP] = (uint32_t)__builtin_frame_address(0);
 181         state.registers[SP] = sp;
 182         state.registers[LR] = (uint32_t)__builtin_return_address(0);
 183         state.registers[PC] = (uint32_t)db_trace_self;
 184
 185         db_stack_trace_cmd(&state);
 186 }