gdb/m68k-tdep.h

   1 /* Target-dependent code for the Motorola 68000 series.
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001,
   4    2003, 2004, 2007, 2008 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef M68K_TDEP_H
  22 #define M68K_TDEP_H
  23
  24 struct frame_info;
  25
  26 /* Register numbers of various important registers.  */
  27
  28 enum m68k_regnum
  29 {
  30   M68K_D0_REGNUM = 0,
  31   M68K_D1_REGNUM = 1,
  32   M68K_D2_REGNUM = 2,
  33   M68K_D7_REGNUM = 7,
  34   M68K_A0_REGNUM = 8,
  35   M68K_A1_REGNUM = 9,
  36   M68K_A2_REGNUM = 10,
  37   M68K_FP_REGNUM = 14,          /* Address of executing stack frame.  */
  38   M68K_SP_REGNUM = 15,          /* Address of top of stack.  */
  39   M68K_PS_REGNUM = 16,          /* Processor status.  */
  40   M68K_PC_REGNUM = 17,          /* Program counter.  */
  41   M68K_FP0_REGNUM = 18,         /* Floating point register 0.  */
  42   M68K_FPC_REGNUM = 26,         /* 68881 control register.  */
  43   M68K_FPS_REGNUM = 27,         /* 68881 status register.  */
  44   M68K_FPI_REGNUM = 28
  45 };
  46
  47 /* Number of machine registers.  */
  48 #define M68K_NUM_REGS   (M68K_FPI_REGNUM + 1)
  49
  50 /* Size of the largest register.  */
  51 #define M68K_MAX_REGISTER_SIZE  12
  52
  53 /* Convention for returning structures.  */
  54
  55 enum struct_return
  56 {
  57   pcc_struct_return,            /* Return "short" structures in memory.  */
  58   reg_struct_return             /* Return "short" structures in registers.  */
  59 };
  60
  61 /* Particular flavour of m68k.  */
  62 enum m68k_flavour
  63   {
  64     m68k_no_flavour,
  65     m68k_coldfire_flavour,
  66     m68k_fido_flavour
  67   };
  68
  69 /* Target-dependent structure in gdbarch.  */
  70
  71 struct gdbarch_tdep
  72 {
  73   /* Offset to PC value in the jump buffer.  If this is negative,
  74      longjmp support will be disabled.  */
  75   int jb_pc;
  76   /* The size of each entry in the jump buffer.  */
  77   size_t jb_elt_size;
  78
  79   /* Register in which the address to store a structure value is
  80      passed to a function.  */
  81   int struct_value_regnum;
  82
  83   /* Convention for returning structures.  */
  84   enum struct_return struct_return;
  85
  86   /* Convention for returning floats.  zero in int regs, non-zero in float.  */
  87   int float_return;
  88
  89   /* The particular flavour of m68k.  */
  90   enum m68k_flavour flavour;
  91
  92   /* Flag set if the floating point registers are present, or assumed
  93      to be present.  */
  94   int fpregs_present;
  95 };
  96
  97 /* Initialize a SVR4 architecture variant.  */
  98 extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
  99 \f
 100
 101 /* Functions exported from m68kbsd-tdep.c.  */
 102
 103 extern int m68kbsd_fpreg_offset (int regnum);
 104
 105 #endif /* m68k-tdep.h */