The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/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  * Copyright (c) 2020 John Baldwin <jhb@FreeBSD.org>
    6  *
    7  * Portions of this software were developed by Semihalf under
    8  * the sponsorship of the FreeBSD Foundation.
    9  *
   10  * Portions of this software were developed by SRI International and the
   11  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
   12  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
   13  *
   14  * Portions of this software were developed by the University of Cambridge
   15  * Computer Laboratory as part of the CTSRD Project, with support from the
   16  * UK Higher Education Innovation Fund (HEIF).
   17  *
   18  * Redistribution and use in source and binary forms, with or without
   19  * modification, are permitted provided that the following conditions
   20  * are met:
   21  * 1. Redistributions of source code must retain the above copyright
   22  *    notice, this list of conditions and the following disclaimer.
   23  * 2. Redistributions in binary form must reproduce the above copyright
   24  *    notice, this list of conditions and the following disclaimer in the
   25  *    documentation and/or other materials provided with the distribution.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 #include <sys/param.h>
   44 #include <sys/kdb.h>
   45 #include <sys/proc.h>
   46 
   47 #include <ddb/ddb.h>
   48 #include <ddb/db_sym.h>
   49 
   50 #include <machine/pcb.h>
   51 #include <machine/riscvreg.h>
   52 #include <machine/stack.h>
   53 #include <machine/vmparam.h>
   54 
   55 void
   56 db_md_list_watchpoints(void)
   57 {
   58 
   59 }
   60 
   61 int
   62 db_md_clr_watchpoint(db_expr_t addr, db_expr_t size)
   63 {
   64 
   65         return (0);
   66 }
   67 
   68 int
   69 db_md_set_watchpoint(db_expr_t addr, db_expr_t size)
   70 {
   71 
   72         return (0);
   73 }
   74 
   75 static void
   76 db_stack_trace_cmd(struct unwind_state *frame)
   77 {
   78         const char *name;
   79         db_expr_t offset;
   80         db_expr_t value;
   81         c_db_sym_t sym;
   82         uint64_t pc;
   83 
   84         while (1) {
   85                 pc = frame->pc;
   86 
   87                 sym = db_search_symbol(pc, DB_STGY_ANY, &offset);
   88                 if (sym == C_DB_SYM_NULL) {
   89                         value = 0;
   90                         name = "(null)";
   91                 } else
   92                         db_symbol_values(sym, &name, &value);
   93 
   94                 db_printf("%s() at ", name);
   95                 db_printsym(frame->pc, DB_STGY_PROC);
   96                 db_printf("\n");
   97 
   98                 if (strcmp(name, "cpu_exception_handler_supervisor") == 0 ||
   99                     strcmp(name, "cpu_exception_handler_user") == 0) {
  100                         struct trapframe *tf;
  101 
  102                         tf = (struct trapframe *)(uintptr_t)frame->sp;
  103 
  104                         if (tf->tf_scause & EXCP_INTR)
  105                                 db_printf("--- interrupt %ld\n",
  106                                     tf->tf_scause & EXCP_MASK);
  107                         else
  108                                 db_printf("--- exception %ld, tval = %#lx\n",
  109                                     tf->tf_scause & EXCP_MASK,
  110                                     tf->tf_stval);
  111                         frame->sp = (uint64_t)tf->tf_sp;
  112                         frame->fp = (uint64_t)tf->tf_s[0];
  113                         frame->pc = (uint64_t)tf->tf_sepc;
  114                         if (!INKERNEL(frame->fp))
  115                                 break;
  116                         continue;
  117                 }
  118 
  119                 if (strcmp(name, "fork_trampoline") == 0)
  120                         break;
  121 
  122                 if (unwind_frame(frame) < 0)
  123                         break;
  124         }
  125 }
  126 
  127 int
  128 db_trace_thread(struct thread *thr, int count)
  129 {
  130         struct unwind_state frame;
  131         struct pcb *ctx;
  132 
  133         ctx = kdb_thr_ctx(thr);
  134 
  135         frame.sp = (uint64_t)ctx->pcb_sp;
  136         frame.fp = (uint64_t)ctx->pcb_s[0];
  137         frame.pc = (uint64_t)ctx->pcb_ra;
  138         db_stack_trace_cmd(&frame);
  139         return (0);
  140 }
  141 
  142 void
  143 db_trace_self(void)
  144 {
  145         struct unwind_state frame;
  146         uint64_t sp;
  147 
  148         __asm __volatile("mv %0, sp" : "=&r" (sp));
  149 
  150         frame.sp = sp;
  151         frame.fp = (uint64_t)__builtin_frame_address(0);
  152         frame.pc = (uint64_t)db_trace_self;
  153         db_stack_trace_cmd(&frame);
  154 }

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