sys/arch/arm/arm32/kgdb_machdep.c

   1 /*      $NetBSD: kgdb_machdep.c,v 1.6 2009/03/14 15:36:01 dsl Exp $     */
   2
   3 /*
   4  * Copyright (c) 1996 Matthias Pfaller.
   5  * All rights reserved.
   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 ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.6 2009/03/14 15:36:01 dsl Exp $");
  30
  31 #include "opt_ddb.h"
  32 #include "opt_kgdb.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/kgdb.h>
  37
  38 #include <uvm/uvm_extern.h>
  39
  40 #include <machine/frame.h>
  41 #include <machine/reg.h>
  42 #include <machine/trap.h>
  43
  44 /*
  45  * Determine if the memory at va..(va+len) is valid.
  46  */
  47 int
  48 kgdb_acc(vaddr_t va, size_t len)
  49 {
  50         vaddr_t last_va;
  51
  52         last_va = va + len;
  53         va  &= ~PGOFSET;
  54         last_va &= ~PGOFSET;
  55
  56         do {
  57                 if (db_validate_address(va))
  58                         return (0);
  59                 va  += PAGE_SIZE;
  60         } while (va < last_va);
  61
  62         return (1);
  63 }
  64
  65 /*
  66  * Translate a trap number into a unix compatible signal value.
  67  * (gdb only understands unix signal numbers).
  68  */
  69 int
  70 kgdb_signal(int type)
  71 {
  72
  73         switch (type) {
  74         case T_BREAKPOINT:
  75                 return(SIGTRAP);
  76         case -1:
  77                 return(SIGSEGV);
  78         default:
  79                 return(SIGINT);
  80         }
  81 }
  82
  83 /*
  84  * Definitions exported from gdb.
  85  */
  86
  87 /*
  88  * Translate the values stored in the kernel regs struct to the format
  89  * understood by gdb.
  90  */
  91 void
  92 kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
  93 {
  94
  95         gdb_regs[KGDB_REGNUM_R0 +  0] = regs->tf_r0;
  96         gdb_regs[KGDB_REGNUM_R0 +  1] = regs->tf_r1;
  97         gdb_regs[KGDB_REGNUM_R0 +  2] = regs->tf_r2;
  98         gdb_regs[KGDB_REGNUM_R0 +  3] = regs->tf_r3;
  99         gdb_regs[KGDB_REGNUM_R0 +  4] = regs->tf_r4;
 100         gdb_regs[KGDB_REGNUM_R0 +  5] = regs->tf_r5;
 101         gdb_regs[KGDB_REGNUM_R0 +  6] = regs->tf_r6;
 102         gdb_regs[KGDB_REGNUM_R0 +  7] = regs->tf_r7;
 103         gdb_regs[KGDB_REGNUM_R0 +  8] = regs->tf_r8;
 104         gdb_regs[KGDB_REGNUM_R0 +  9] = regs->tf_r9;
 105         gdb_regs[KGDB_REGNUM_R0 + 10] = regs->tf_r10;
 106         gdb_regs[KGDB_REGNUM_R0 + 11] = regs->tf_r11;
 107         gdb_regs[KGDB_REGNUM_R0 + 12] = regs->tf_r12;
 108         gdb_regs[KGDB_REGNUM_R0 + 13] = regs->tf_svc_sp;
 109         gdb_regs[KGDB_REGNUM_R0 + 14] = regs->tf_svc_lr;
 110         gdb_regs[KGDB_REGNUM_R0 + 15] = regs->tf_pc;
 111
 112         gdb_regs[KGDB_REGNUM_SPSR] = regs->tf_spsr;
 113 }
 114
 115 /*
 116  * Reverse the above.
 117  */
 118 void
 119 kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
 120 {
 121         regs->tf_r0     = gdb_regs[KGDB_REGNUM_R0 +  0];
 122         regs->tf_r1     = gdb_regs[KGDB_REGNUM_R0 +  1];
 123         regs->tf_r2     = gdb_regs[KGDB_REGNUM_R0 +  2];
 124         regs->tf_r3     = gdb_regs[KGDB_REGNUM_R0 +  3];
 125         regs->tf_r4     = gdb_regs[KGDB_REGNUM_R0 +  4];
 126         regs->tf_r5     = gdb_regs[KGDB_REGNUM_R0 +  5];
 127         regs->tf_r6     = gdb_regs[KGDB_REGNUM_R0 +  6];
 128         regs->tf_r7     = gdb_regs[KGDB_REGNUM_R0 +  7];
 129         regs->tf_r8     = gdb_regs[KGDB_REGNUM_R0 +  8];
 130         regs->tf_r9     = gdb_regs[KGDB_REGNUM_R0 +  9];
 131         regs->tf_r10    = gdb_regs[KGDB_REGNUM_R0 + 10];
 132         regs->tf_r11    = gdb_regs[KGDB_REGNUM_R0 + 11];
 133         regs->tf_r12    = gdb_regs[KGDB_REGNUM_R0 + 12];
 134         regs->tf_svc_sp = gdb_regs[KGDB_REGNUM_R0 + 13];
 135         regs->tf_svc_lr = gdb_regs[KGDB_REGNUM_R0 + 14];
 136         regs->tf_pc     = gdb_regs[KGDB_REGNUM_R0 + 15];
 137
 138         regs->tf_spsr = gdb_regs[KGDB_REGNUM_SPSR];
 139 }
 140
 141 /*
 142  * Trap into kgdb to wait for debugger to connect,
 143  * noting on the console why nothing else is going on.
 144  */
 145 void
 146 kgdb_connect(int verbose)
 147 {
 148
 149         if (kgdb_dev == NODEV)
 150                 return;
 151
 152         if (verbose)
 153                 printf("kgdb waiting...");
 154
 155         __asm volatile(KBPT_ASM);
 156
 157         if (verbose)
 158                 printf("connected.\n");
 159
 160         kgdb_debug_panic = 1;
 161 }
 162
 163 /*
 164  * Decide what to do on panic.
 165  * (This is called by panic, like Debugger())
 166  */
 167 void
 168 kgdb_panic(void)
 169 {
 170
 171         if (kgdb_dev != NODEV && kgdb_debug_panic) {
 172                 printf("entering kgdb\n");
 173                 kgdb_connect(kgdb_active == 0);
 174         }
 175 }