sys/i386/i386/gdb_machdep.c

   1 /*-
   2  * Copyright (c) 2004 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/kdb.h>
  33 #include <sys/kernel.h>
  34 #include <sys/proc.h>
  35 #include <sys/signal.h>
  36
  37 #include <machine/gdb_machdep.h>
  38 #include <machine/pcb.h>
  39 #include <machine/trap.h>
  40 #include <machine/frame.h>
  41 #include <machine/endian.h>
  42
  43 #include <gdb/gdb.h>
  44
  45 void *
  46 gdb_cpu_getreg(int regnum, size_t *regsz)
  47 {
  48         static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
  49         static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
  50         static uint32_t _kprivsel = GSEL(GPRIV_SEL, SEL_KPL);
  51
  52         *regsz = gdb_cpu_regsz(regnum);
  53
  54         if (kdb_thread == curthread) {
  55                 switch (regnum) {
  56                 case 0: return (&kdb_frame->tf_eax);
  57                 case 1: return (&kdb_frame->tf_ecx);
  58                 case 2: return (&kdb_frame->tf_edx);
  59                 case 9: return (&kdb_frame->tf_eflags);
  60                 case 10: return (&kdb_frame->tf_cs);
  61                 case 12: return (&kdb_frame->tf_ds);
  62                 case 13: return (&kdb_frame->tf_es);
  63                 case 14: return (&kdb_frame->tf_fs);
  64                 }
  65         }
  66         switch (regnum) {
  67         case 3:  return (&kdb_thrctx->pcb_ebx);
  68         case 4:  return (&kdb_thrctx->pcb_esp);
  69         case 5:  return (&kdb_thrctx->pcb_ebp);
  70         case 6:  return (&kdb_thrctx->pcb_esi);
  71         case 7:  return (&kdb_thrctx->pcb_edi);
  72         case 8:  return (&kdb_thrctx->pcb_eip);
  73         case 10: return (&_kcodesel);
  74         case 11: return (&_kdatasel);
  75         case 12: return (&_kdatasel);
  76         case 13: return (&_kdatasel);
  77         case 14: return (&_kprivsel);
  78         case 15: return (&kdb_thrctx->pcb_gs);
  79         }
  80         return (NULL);
  81 }
  82
  83 void
  84 gdb_cpu_setreg(int regnum, void *val)
  85 {
  86
  87         switch (regnum) {
  88         case GDB_REG_PC:
  89                 kdb_thrctx->pcb_eip = *(register_t *)val;
  90                 if (kdb_thread  == curthread)
  91                         kdb_frame->tf_eip = *(register_t *)val;
  92         }
  93 }
  94
  95 int
  96 gdb_cpu_signal(int type, int code)
  97 {
  98
  99         switch (type & ~T_USER) {
 100         case 0: return (SIGFPE);        /* Divide by zero. */
 101         case 1: return (SIGTRAP);       /* Debug exception. */
 102         case 3: return (SIGTRAP);       /* Breakpoint. */
 103         case 4: return (SIGURG);        /* into instr. (overflow). */
 104         case 5: return (SIGURG);        /* bound instruction. */
 105         case 6: return (SIGILL);        /* Invalid opcode. */
 106         case 7: return (SIGFPE);        /* Coprocessor not present. */
 107         case 8: return (SIGEMT);        /* Double fault. */
 108         case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
 109         case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
 110         case 11: return (SIGSEGV);      /* Segment not present. */
 111         case 12: return (SIGSEGV);      /* Stack exception. */
 112         case 13: return (SIGSEGV);      /* General protection. */
 113         case 14: return (SIGSEGV);      /* Page fault. */
 114         case 16: return (SIGEMT);       /* Coprocessor error. */
 115         }
 116         return (SIGEMT);
 117 }