db_interface.c

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    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 <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 #include <sys/param.h>
   32 #include <sys/proc.h>
   33 #include <vm/vm.h>
   34 #include <vm/pmap.h>
   35 #include <vm/vm_map.h>
   36 
   37 #ifdef KDB
   38 #include <sys/kdb.h>
   39 #endif
   40 
   41 #include <ddb/ddb.h>
   42 #include <ddb/db_variables.h>
   43 
   44 #include <machine/cpu.h>
   45 #include <machine/pcb.h>
   46 #include <machine/stack.h>
   47 #include <machine/vmparam.h>
   48 
   49 static int
   50 db_frame(struct db_variable *vp, db_expr_t *valuep, int op)
   51 {
   52         long *reg;
   53 
   54         if (kdb_frame == NULL)
   55                 return (0);
   56 
   57         reg = (long *)((uintptr_t)kdb_frame + (db_expr_t)vp->valuep);
   58         if (op == DB_VAR_GET)
   59                 *valuep = *reg;
   60         else
   61                 *reg = *valuep;
   62         return (1);
   63 }
   64 
   65 #define DB_OFFSET(x)    (db_expr_t *)offsetof(struct trapframe, x)
   66 struct db_variable db_regs[] = {
   67         { "spsr", DB_OFFSET(tf_spsr),   db_frame },
   68         { "x0", DB_OFFSET(tf_x[0]),     db_frame },
   69         { "x1", DB_OFFSET(tf_x[1]),     db_frame },
   70         { "x2", DB_OFFSET(tf_x[2]),     db_frame },
   71         { "x3", DB_OFFSET(tf_x[3]),     db_frame },
   72         { "x4", DB_OFFSET(tf_x[4]),     db_frame },
   73         { "x5", DB_OFFSET(tf_x[5]),     db_frame },
   74         { "x6", DB_OFFSET(tf_x[6]),     db_frame },
   75         { "x7", DB_OFFSET(tf_x[7]),     db_frame },
   76         { "x8", DB_OFFSET(tf_x[8]),     db_frame },
   77         { "x9", DB_OFFSET(tf_x[9]),     db_frame },
   78         { "x10", DB_OFFSET(tf_x[10]),   db_frame },
   79         { "x11", DB_OFFSET(tf_x[11]),   db_frame },
   80         { "x12", DB_OFFSET(tf_x[12]),   db_frame },
   81         { "x13", DB_OFFSET(tf_x[13]),   db_frame },
   82         { "x14", DB_OFFSET(tf_x[14]),   db_frame },
   83         { "x15", DB_OFFSET(tf_x[15]),   db_frame },
   84         { "x16", DB_OFFSET(tf_x[16]),   db_frame },
   85         { "x17", DB_OFFSET(tf_x[17]),   db_frame },
   86         { "x18", DB_OFFSET(tf_x[18]),   db_frame },
   87         { "x19", DB_OFFSET(tf_x[19]),   db_frame },
   88         { "x20", DB_OFFSET(tf_x[20]),   db_frame },
   89         { "x21", DB_OFFSET(tf_x[21]),   db_frame },
   90         { "x22", DB_OFFSET(tf_x[22]),   db_frame },
   91         { "x23", DB_OFFSET(tf_x[23]),   db_frame },
   92         { "x24", DB_OFFSET(tf_x[24]),   db_frame },
   93         { "x25", DB_OFFSET(tf_x[25]),   db_frame },
   94         { "x26", DB_OFFSET(tf_x[26]),   db_frame },
   95         { "x27", DB_OFFSET(tf_x[27]),   db_frame },
   96         { "x28", DB_OFFSET(tf_x[28]),   db_frame },
   97         { "x29", DB_OFFSET(tf_x[29]),   db_frame },
   98         { "lr", DB_OFFSET(tf_lr),       db_frame },
   99         { "elr", DB_OFFSET(tf_elr),     db_frame },
  100         { "sp", DB_OFFSET(tf_sp), db_frame },
  101 };
  102 
  103 struct db_variable *db_eregs = db_regs + nitems(db_regs);
  104 
  105 void
  106 db_show_mdpcpu(struct pcpu *pc)
  107 {
  108 }
  109 
  110 /*
  111  * Read bytes from kernel address space for debugger.
  112  */
  113 int
  114 db_read_bytes(vm_offset_t addr, size_t size, char *data)
  115 {
  116         jmp_buf jb;
  117         void *prev_jb;
  118         const char *src;
  119         int ret;
  120         uint64_t tmp64;
  121         uint32_t tmp32;
  122         uint16_t tmp16;
  123 
  124         prev_jb = kdb_jmpbuf(jb);
  125         ret = setjmp(jb);
  126 
  127         if (ret == 0) {
  128                 src = (const char *)addr;
  129                 if (size == 8 && (addr & 7) == 0) {
  130                         tmp64 = *((const int *)src);
  131                         src = (const char *)&tmp64;
  132                 } else if (size == 4 && (addr & 3) == 0) {
  133                         tmp32 = *((const int *)src);
  134                         src = (const char *)&tmp32;
  135                 } else if (size == 2 && (addr & 1) == 0) {
  136                         tmp16 = *((const short *)src);
  137                         src = (const char *)&tmp16;
  138                 }
  139                 while (size-- > 0)
  140                         *data++ = *src++;
  141         }
  142         (void)kdb_jmpbuf(prev_jb);
  143 
  144         return (ret);
  145 }
  146 
  147 /*
  148  * Write bytes to kernel address space for debugger.
  149  */
  150 int
  151 db_write_bytes(vm_offset_t addr, size_t size, char *data)
  152 {
  153         jmp_buf jb;
  154         void *prev_jb;
  155         char *dst;
  156         size_t i;
  157         int ret;
  158 
  159         prev_jb = kdb_jmpbuf(jb);
  160         ret = setjmp(jb);
  161         if (ret == 0) {
  162                 if (!arm64_get_writable_addr(addr, &addr)) {
  163                         ret = 1;
  164                 } else {
  165                         dst = (char *)addr;
  166                         for (i = 0; i < size; i++)
  167                                 *dst++ = *data++;
  168                         dsb(ish);
  169 
  170                         /*
  171                          * Ensure the I & D cache are in sync if we wrote
  172                          * to executable memory.
  173                          */
  174                         cpu_icache_sync_range(addr, (vm_size_t)size);
  175                 }
  176         }
  177         (void)kdb_jmpbuf(prev_jb);
  178 
  179         return (ret);
  180 }

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

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