gdb/m68klinux-nat.c

   1 /* Motorola m68k native support for Linux
   2    Copyright (C) 1996,1998 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23 #include "language.h"
  24 #include "gdbcore.h"
  25
  26 #ifdef USG
  27 #include <sys/types.h>
  28 #endif
  29
  30 #include <sys/param.h>
  31 #include <sys/dir.h>
  32 #include <signal.h>
  33 #include <sys/user.h>
  34 #include <sys/ioctl.h>
  35 #include <fcntl.h>
  36 #include <sys/procfs.h>
  37
  38 #include <sys/file.h>
  39 #include "gdb_stat.h"
  40
  41 #include "floatformat.h"
  42
  43 #include "target.h"
  44
  45 \f
  46 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
  47 static const int regmap[] =
  48 {
  49   PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
  50   PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
  51   PT_SR, PT_PC,
  52   /* PT_FP0, ..., PT_FP7 */
  53   21, 24, 27, 30, 33, 36, 39, 42,
  54   /* PT_FPCR, PT_FPSR, PT_FPIAR */
  55   45, 46, 47
  56 };
  57
  58 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
  59    is stored.  */
  60
  61 int
  62 m68k_linux_register_u_addr (blockend, regnum)
  63      int blockend;
  64      int regnum;
  65 {
  66     return (blockend + 4 * regmap[regnum]);
  67 }
  68
  69 /*  Given a pointer to a general register set in /proc format (gregset_t *),
  70     unpack the register contents and supply them as gdb's idea of the current
  71     register values. */
  72
  73 #ifndef USE_PROC_FS
  74
  75 void
  76 supply_gregset (gregsetp)
  77      gregset_t *gregsetp;
  78 {
  79   int regi;
  80
  81   for (regi = D0_REGNUM ; regi <= SP_REGNUM ; regi++)
  82     supply_register (regi, (char *) (*gregsetp + regmap[regi]));
  83   supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
  84   supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
  85 }
  86
  87 /*  Given a pointer to a floating point register set in /proc format
  88     (fpregset_t *), unpack the register contents and supply them as gdb's
  89     idea of the current floating point register values. */
  90
  91 void
  92 supply_fpregset (fpregsetp)
  93      fpregset_t *fpregsetp;
  94 {
  95   int regi;
  96
  97   for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++)
  98     supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
  99   supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
 100   supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
 101   supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
 102 }
 103
 104 #endif
 105
 106 \f
 107 int
 108 kernel_u_size ()
 109 {
 110   return (sizeof (struct user));
 111 }
 112 \f
 113 /* Return non-zero if PC points into the signal trampoline.  */
 114
 115 int
 116 in_sigtramp (pc)
 117      CORE_ADDR pc;
 118 {
 119   CORE_ADDR sp;
 120   char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
 121   int insn;
 122
 123   sp = read_register (SP_REGNUM);
 124   if (pc - 2 < sp)
 125     return 0;
 126
 127   if (read_memory_nobpt (pc, buf, sizeof (buf)))
 128     return 0;
 129   insn = extract_unsigned_integer (buf, sizeof (buf));
 130   if (insn == 0xdefc /* addaw #,sp */
 131       || insn == 0x7077 /* moveq #119,d0 */
 132       || insn == 0x4e40 /* trap #0 */
 133       || insn == 0x203c /* movel #,d0 */)
 134     return 1;
 135
 136   if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
 137     return 0;
 138   insn = extract_unsigned_integer (buf, sizeof (buf));
 139   if (insn == 0xdefc /* addaw #,sp */
 140       || insn == 0x7077 /* moveq #119,d0 */
 141       || insn == 0x4e40 /* trap #0 */
 142       || insn == 0x203c /* movel #,d0 */)
 143     return 1;
 144
 145   return 0;
 146 }