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 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 2 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, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #ifndef M68K_TDEP_H
  24 #define M68K_TDEP_H
  25
  26 struct frame_info;
  27
  28 /* Register numbers of various important registers.  */
  29
  30 enum m68k_regnum
  31 {
  32   M68K_D0_REGNUM = 0,
  33   M68K_D1_REGNUM = 1,
  34   M68K_D2_REGNUM = 2,
  35   M68K_D7_REGNUM = 7,
  36   M68K_A0_REGNUM = 8,
  37   M68K_A1_REGNUM = 9,
  38   M68K_A2_REGNUM = 10,
  39   M68K_FP_REGNUM = 14,          /* Address of executing stack frame.  */
  40   M68K_SP_REGNUM = 15,          /* Address of top of stack.  */
  41   M68K_PS_REGNUM = 16,          /* Processor status.  */
  42   M68K_PC_REGNUM = 17,          /* Program counter.  */
  43   M68K_FP0_REGNUM = 18,         /* Floating point register 0.  */
  44   M68K_FPC_REGNUM = 26,         /* 68881 control register.  */
  45   M68K_FPS_REGNUM = 27,         /* 68881 status register.  */
  46   M68K_FPI_REGNUM = 28
  47 };
  48
  49 /* Number of machine registers.  */
  50 #define M68K_NUM_REGS   (M68K_FPI_REGNUM + 1)
  51
  52 /* Size of the largest register.  */
  53 #define M68K_MAX_REGISTER_SIZE  12
  54
  55 /* Convention for returning structures.  */
  56
  57 enum struct_return
  58 {
  59   pcc_struct_return,            /* Return "short" structures in memory.  */
  60   reg_struct_return             /* Return "short" structures in registers.  */
  61 };
  62
  63 /* Particular flavour of m68k.  */
  64 enum m68k_flavour
  65   {
  66     m68k_no_flavour,
  67     m68k_coldfire_flavour,
  68     m68k_fido_flavour
  69   };
  70
  71 /* Target-dependent structure in gdbarch.  */
  72
  73 struct gdbarch_tdep
  74 {
  75   /* Offset to PC value in the jump buffer.  If this is negative,
  76      longjmp support will be disabled.  */
  77   int jb_pc;
  78   /* The size of each entry in the jump buffer.  */
  79   size_t jb_elt_size;
  80
  81   /* Register in which the address to store a structure value is
  82      passed to a function.  */
  83   int struct_value_regnum;
  84
  85   /* Convention for returning structures.  */
  86   enum struct_return struct_return;
  87
  88   /* Convention for returning floats.  zero in int regs, non-zero in float.  */
  89   int float_return;
  90
  91   /* The particular flavour of m68k.  */
  92   enum m68k_flavour flavour;
  93
  94   /* Flag set if the floating point registers are present, or assumed
  95      to be present.  */
  96   int fpregs_present;
  97 };
  98
  99 /* Initialize a SVR4 architecture variant.  */
 100 extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 101 \f
 102
 103 /* Functions exported from m68kbsd-tdep.c.  */
 104
 105 extern int m68kbsd_fpreg_offset (int regnum);
 106
 107 #endif /* m68k-tdep.h */