db_trace.c

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    1 /*-
    2  * Copyright (c) 2015 The FreeBSD Foundation
    3  * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com>
    4  * All rights reserved.
    5  *
    6  * Portions of this software were developed by Semihalf under
    7  * the sponsorship of the FreeBSD Foundation.
    8  *
    9  * Portions of this software were developed by SRI International and the
   10  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
   11  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
   12  *
   13  * Portions of this software were developed by the University of Cambridge
   14  * Computer Laboratory as part of the CTSRD Project, with support from the
   15  * UK Higher Education Innovation Fund (HEIF).
   16  *
   17  * Redistribution and use in source and binary forms, with or without
   18  * modification, are permitted provided that the following conditions
   19  * are met:
   20  * 1. Redistributions of source code must retain the above copyright
   21  *    notice, this list of conditions and the following disclaimer.
   22  * 2. Redistributions in binary form must reproduce the above copyright
   23  *    notice, this list of conditions and the following disclaimer in the
   24  *    documentation and/or other materials provided with the distribution.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/11.2/sys/riscv/riscv/db_trace.c 296614 2016-03-10 15:51:43Z br $");
   41 #include <sys/param.h>
   42 #include <sys/proc.h>
   43 #include <sys/kdb.h>
   44 #include <machine/pcb.h>
   45 #include <ddb/ddb.h>
   46 #include <ddb/db_sym.h>
   47 
   48 #include <machine/riscvreg.h>
   49 #include <machine/stack.h>
   50 
   51 void
   52 db_md_list_watchpoints()
   53 {
   54 
   55 }
   56 
   57 int
   58 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
   59 {
   60 
   61         return (0);
   62 }
   63 
   64 int
   65 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
   66 {
   67 
   68         return (0);
   69 }
   70 
   71 static void
   72 db_stack_trace_cmd(struct unwind_state *frame)
   73 {
   74         const char *name;
   75         db_expr_t offset;
   76         db_expr_t value;
   77         c_db_sym_t sym;
   78         uint64_t pc;
   79 
   80         while (1) {
   81                 pc = frame->pc;
   82 
   83                 if (unwind_frame(frame) < 0)
   84                         break;
   85 
   86                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
   87                 if (sym == C_DB_SYM_NULL) {
   88                         value = 0;
   89                         name = "(null)";
   90                 } else
   91                         db_symbol_values(sym, &name, &value);
   92 
   93                 db_printf("%s() at ", name);
   94                 db_printsym(frame->pc, DB_STGY_PROC);
   95                 db_printf("\n");
   96 
   97                 db_printf("\t pc = 0x%016lx ra = 0x%016lx\n",
   98                     pc, frame->pc);
   99                 db_printf("\t sp = 0x%016lx fp = 0x%016lx\n",
  100                     frame->sp, frame->fp);
  101                 db_printf("\n");
  102         }
  103 }
  104 
  105 int
  106 db_trace_thread(struct thread *thr, int count)
  107 {
  108         struct unwind_state frame;
  109         struct pcb *ctx;
  110 
  111         if (thr != curthread) {
  112                 ctx = kdb_thr_ctx(thr);
  113 
  114                 frame.sp = (uint64_t)ctx->pcb_sp;
  115                 frame.fp = (uint64_t)ctx->pcb_s[0];
  116                 frame.pc = (uint64_t)ctx->pcb_ra;
  117                 db_stack_trace_cmd(&frame);
  118         } else
  119                 db_trace_self();
  120         return (0);
  121 }
  122 
  123 void
  124 db_trace_self(void)
  125 {
  126         struct unwind_state frame;
  127         uint64_t sp;
  128 
  129         __asm __volatile("mv %0, sp" : "=&r" (sp));
  130 
  131         frame.sp = sp;
  132         frame.fp = (uint64_t)__builtin_frame_address(0);
  133         frame.pc = (uint64_t)db_trace_self;
  134         db_stack_trace_cmd(&frame);
  135 }

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

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sys/riscv/riscv/db_trace.c