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
  74 /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
  75    for supply_gregset and supply_fpregset. The definitions
  76    in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
  77    the definitions in m68klinux-nat.c will be used. This is a
  78    bit of a hack. The supply_* routines do not belong in
  79    *_tdep.c files. But, there are several lynx ports that currently
  80    depend on these definitions. */
  81
  82 #ifndef USE_PROC_FS
  83
  84 void
  85 supply_gregset (gregsetp)
  86      gregset_t *gregsetp;
  87 {
  88   int regi;
  89
  90   for (regi = D0_REGNUM ; regi <= SP_REGNUM ; regi++)
  91     supply_register (regi, (char *) (*gregsetp + regmap[regi]));
  92   supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
  93   supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
  94 }
  95
  96 /*  Given a pointer to a floating point register set in /proc format
  97     (fpregset_t *), unpack the register contents and supply them as gdb's
  98     idea of the current floating point register values. */
  99
 100 void
 101 supply_fpregset (fpregsetp)
 102      fpregset_t *fpregsetp;
 103 {
 104   int regi;
 105
 106   for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++)
 107     supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
 108   supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
 109   supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
 110   supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
 111 }
 112
 113 #endif
 114
 115 \f
 116 int
 117 kernel_u_size ()
 118 {
 119   return (sizeof (struct user));
 120 }
 121 \f
 122 /* Return non-zero if PC points into the signal trampoline.  */
 123
 124 int
 125 in_sigtramp (pc)
 126      CORE_ADDR pc;
 127 {
 128   CORE_ADDR sp;
 129   char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
 130   int insn;
 131
 132   sp = read_register (SP_REGNUM);
 133   if (pc - 2 < sp)
 134     return 0;
 135
 136   if (read_memory_nobpt (pc, 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   if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
 146     return 0;
 147   insn = extract_unsigned_integer (buf, sizeof (buf));
 148   if (insn == 0xdefc /* addaw #,sp */
 149       || insn == 0x7077 /* moveq #119,d0 */
 150       || insn == 0x4e40 /* trap #0 */
 151       || insn == 0x203c /* movel #,d0 */)
 152     return 1;
 153
 154   return 0;
 155 }