db_trace.c

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    1 /*-
    2  * Copyright (c) 2015 The FreeBSD Foundation
    3  * All rights reserved.
    4  *
    5  * This software was developed by Semihalf under
    6  * the sponsorship of the FreeBSD Foundation.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include "opt_ddb.h"
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/11.2/sys/arm64/arm64/db_trace.c 305773 2016-09-13 16:22:50Z andrew $");
   34 #include <sys/param.h>
   35 #include <sys/proc.h>
   36 #include <sys/kdb.h>
   37 #include <machine/pcb.h>
   38 #include <ddb/ddb.h>
   39 #include <ddb/db_sym.h>
   40 
   41 #include <machine/armreg.h>
   42 #include <machine/debug_monitor.h>
   43 #include <machine/stack.h>
   44 
   45 void
   46 db_md_list_watchpoints()
   47 {
   48 
   49         dbg_show_watchpoint();
   50 }
   51 
   52 int
   53 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
   54 {
   55 
   56         return (dbg_remove_watchpoint(addr, size, DBG_FROM_EL1));
   57 }
   58 
   59 int
   60 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
   61 {
   62 
   63         return (dbg_setup_watchpoint(addr, size, DBG_FROM_EL1,
   64             HW_BREAKPOINT_RW));
   65 }
   66 
   67 static void
   68 db_stack_trace_cmd(struct unwind_state *frame)
   69 {
   70         c_db_sym_t sym;
   71         const char *name;
   72         db_expr_t value;
   73         db_expr_t offset;
   74 
   75         while (1) {
   76                 uint64_t pc = frame->pc;
   77                 int ret;
   78 
   79                 ret = unwind_frame(frame);
   80                 if (ret < 0)
   81                         break;
   82 
   83                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
   84                 if (sym == C_DB_SYM_NULL) {
   85                         value = 0;
   86                         name = "(null)";
   87                 } else
   88                         db_symbol_values(sym, &name, &value);
   89 
   90                 db_printf("%s() at ", name);
   91                 db_printsym(frame->pc, DB_STGY_PROC);
   92                 db_printf("\n");
   93 
   94                 db_printf("\t pc = 0x%016lx  lr = 0x%016lx\n", pc,
   95                     frame->pc);
   96                 db_printf("\t sp = 0x%016lx  fp = 0x%016lx\n", frame->sp,
   97                     frame->fp);
   98                 /* TODO: Show some more registers */
   99                 db_printf("\n");
  100         }
  101 }
  102 
  103 int
  104 db_trace_thread(struct thread *thr, int count)
  105 {
  106         struct unwind_state frame;
  107         struct pcb *ctx;
  108 
  109         if (thr != curthread) {
  110                 ctx = kdb_thr_ctx(thr);
  111 
  112                 frame.sp = (uint64_t)ctx->pcb_sp;
  113                 frame.fp = (uint64_t)ctx->pcb_x[29];
  114                 frame.pc = (uint64_t)ctx->pcb_x[30];
  115                 db_stack_trace_cmd(&frame);
  116         } else
  117                 db_trace_self();
  118         return (0);
  119 }
  120 
  121 void
  122 db_trace_self(void)
  123 {
  124         struct unwind_state frame;
  125         uint64_t sp;
  126 
  127         __asm __volatile("mov %0, sp" : "=&r" (sp));
  128 
  129         frame.sp = sp;
  130         frame.fp = (uint64_t)__builtin_frame_address(0);
  131         frame.pc = (uint64_t)db_trace_self;
  132         db_stack_trace_cmd(&frame);
  133 }

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FreeBSD/Linux Kernel Cross Reference sys/arm64/arm64/db_trace.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/arm64/db_trace.c