gdb/m68k-tdep.h

   1 /* Target-dependent code for the Motorola 68000 series.
   2
   3    Copyright (C) 1990-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef M68K_TDEP_H
  21 #define M68K_TDEP_H
  22
  23 struct frame_info;
  24
  25 /* Register numbers of various important registers.  */
  26
  27 enum m68k_regnum
  28 {
  29   M68K_D0_REGNUM = 0,
  30   M68K_D1_REGNUM = 1,
  31   M68K_D2_REGNUM = 2,
  32   M68K_D7_REGNUM = 7,
  33   M68K_A0_REGNUM = 8,
  34   M68K_A1_REGNUM = 9,
  35   M68K_A2_REGNUM = 10,
  36   M68K_FP_REGNUM = 14,          /* Address of executing stack frame.  */
  37   M68K_SP_REGNUM = 15,          /* Address of top of stack.  */
  38   M68K_PS_REGNUM = 16,          /* Processor status.  */
  39   M68K_PC_REGNUM = 17,          /* Program counter.  */
  40   M68K_FP0_REGNUM = 18,         /* Floating point register 0.  */
  41   M68K_FPC_REGNUM = 26,         /* 68881 control register.  */
  42   M68K_FPS_REGNUM = 27,         /* 68881 status register.  */
  43   M68K_FPI_REGNUM = 28
  44 };
  45
  46 /* Number of machine registers.  */
  47 #define M68K_NUM_REGS   (M68K_FPI_REGNUM + 1)
  48
  49 /* Size of the largest register.  */
  50 #define M68K_MAX_REGISTER_SIZE  12
  51
  52 /* Convention for returning structures.  */
  53
  54 enum struct_return
  55 {
  56   pcc_struct_return,            /* Return "short" structures in memory.  */
  57   reg_struct_return             /* Return "short" structures in registers.  */
  58 };
  59
  60 /* Particular flavour of m68k.  */
  61 enum m68k_flavour
  62   {
  63     m68k_no_flavour,
  64     m68k_coldfire_flavour,
  65     m68k_fido_flavour
  66   };
  67
  68 /* Target-dependent structure in gdbarch.  */
  69
  70 struct gdbarch_tdep
  71 {
  72   /* Offset to PC value in the jump buffer.  If this is negative,
  73      longjmp support will be disabled.  */
  74   int jb_pc;
  75   /* The size of each entry in the jump buffer.  */
  76   size_t jb_elt_size;
  77
  78   /* Register in which the address to store a structure value is
  79      passed to a function.  */
  80   int struct_value_regnum;
  81
  82   /* Convention for returning structures.  */
  83   enum struct_return struct_return;
  84
  85   /* Convention for returning floats.  zero in int regs, non-zero in float.  */
  86   int float_return;
  87
  88   /* The particular flavour of m68k.  */
  89   enum m68k_flavour flavour;
  90
  91   /* Flag set if the floating point registers are present, or assumed
  92      to be present.  */
  93   int fpregs_present;
  94
  95    /* ISA-specific data types.  */
  96   struct type *m68k_ps_type;
  97   struct type *m68881_ext_type;
  98 };
  99
 100 /* Initialize a SVR4 architecture variant.  */
 101 extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 102 \f
 103
 104 /* Functions exported from m68k-bsd-tdep.c.  */
 105
 106 extern int m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum);
 107
 108 #endif /* m68k-tdep.h */