sys/arm64/arm64/db_trace.c

   1 /*-
   2  * Copyright (c) 2015 The FreeBSD Foundation
   3  *
   4  * This software was developed by Semihalf under
   5  * the sponsorship of the FreeBSD Foundation.
   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 "opt_ddb.h"
  30
  31 #include <sys/param.h>
  32 #include <sys/proc.h>
  33 #include <sys/kdb.h>
  34
  35 #include <machine/pcb.h>
  36 #include <ddb/ddb.h>
  37 #include <ddb/db_sym.h>
  38
  39 #include <machine/armreg.h>
  40 #include <machine/debug_monitor.h>
  41 #include <machine/stack.h>
  42 #include <machine/vmparam.h>
  43
  44 #define FRAME_NORMAL    0
  45 #define FRAME_SYNC      1
  46 #define FRAME_IRQ       2
  47 #define FRAME_SERROR    3
  48 #define FRAME_UNHANDLED 4
  49
  50 void
  51 db_md_list_watchpoints(void)
  52 {
  53
  54         dbg_show_watchpoint();
  55 }
  56
  57 static void __nosanitizeaddress
  58 db_stack_trace_cmd(struct thread *td, struct unwind_state *frame)
  59 {
  60         c_db_sym_t sym;
  61         const char *name;
  62         db_expr_t value;
  63         db_expr_t offset;
  64         int frame_type;
  65
  66         while (1) {
  67                 sym = db_search_symbol(frame->pc, DB_STGY_ANY, &offset);
  68                 if (sym == C_DB_SYM_NULL) {
  69                         value = 0;
  70                         name = "(null)";
  71                 } else
  72                         db_symbol_values(sym, &name, &value);
  73
  74                 db_printf("%s() at ", name);
  75                 db_printsym(frame->pc, DB_STGY_PROC);
  76                 db_printf("\n");
  77
  78                 if (strcmp(name, "handle_el0_sync") == 0 ||
  79                     strcmp(name, "handle_el1h_sync") == 0)
  80                         frame_type = FRAME_SYNC;
  81                 else if (strcmp(name, "handle_el0_irq") == 0 ||
  82                      strcmp(name, "handle_el1h_irq") == 0)
  83                         frame_type = FRAME_IRQ;
  84                 else if (strcmp(name, "handle_serror") == 0)
  85                         frame_type = FRAME_SERROR;
  86                 else if (strcmp(name, "handle_empty_exception") == 0)
  87                         frame_type = FRAME_UNHANDLED;
  88                 else
  89                         frame_type = FRAME_NORMAL;
  90
  91                 if (frame_type != FRAME_NORMAL) {
  92                         struct trapframe *tf;
  93
  94                         tf = (struct trapframe *)(uintptr_t)frame->fp - 1;
  95                         if (!__is_aligned(tf, _Alignof(struct trapframe)) ||
  96                             !kstack_contains(td, (vm_offset_t)tf,
  97                             sizeof(*tf))) {
  98                                 db_printf("--- invalid trapframe %p\n", tf);
  99                                 break;
 100                         }
 101
 102                         switch (frame_type) {
 103                         case FRAME_SYNC:
 104                                 db_printf("--- exception, esr %#lx\n",
 105                                     tf->tf_esr);
 106                                 break;
 107                         case FRAME_IRQ:
 108                                 db_printf("--- interrupt\n");
 109                                 break;
 110                         case FRAME_SERROR:
 111                                 db_printf("--- system error, esr %#lx\n",
 112                                     tf->tf_esr);
 113                                 break;
 114                         case FRAME_UNHANDLED:
 115                                 db_printf("--- unhandled exception, esr %#lx\n",
 116                                     tf->tf_esr);
 117                                 break;
 118                         default:
 119                                 __assert_unreachable();
 120                                 break;
 121                         }
 122
 123                         frame->fp = tf->tf_x[29];
 124                         frame->pc = ADDR_MAKE_CANONICAL(tf->tf_elr);
 125                         if (!INKERNEL(frame->fp))
 126                                 break;
 127                 } else {
 128                         if (strcmp(name, "fork_trampoline") == 0)
 129                                 break;
 130
 131                         if (!unwind_frame(td, frame))
 132                                 break;
 133                 }
 134         }
 135 }
 136
 137 int __nosanitizeaddress
 138 db_trace_thread(struct thread *thr, int count)
 139 {
 140         struct unwind_state frame;
 141         struct pcb *ctx;
 142
 143         if (thr != curthread) {
 144                 ctx = kdb_thr_ctx(thr);
 145
 146                 frame.fp = (uintptr_t)ctx->pcb_x[PCB_FP];
 147                 frame.pc = (uintptr_t)ctx->pcb_x[PCB_LR];
 148                 db_stack_trace_cmd(thr, &frame);
 149         } else
 150                 db_trace_self();
 151         return (0);
 152 }
 153
 154 void __nosanitizeaddress
 155 db_trace_self(void)
 156 {
 157         struct unwind_state frame;
 158
 159         frame.fp = (uintptr_t)__builtin_frame_address(0);
 160         frame.pc = (uintptr_t)db_trace_self;
 161         db_stack_trace_cmd(curthread, &frame);
 162 }