gdb/m68k-tdep.h

   1 /* Target-dependent code for the Motorola 68000 series.
   2
   3    Copyright (C) 1990-2023 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 #include "gdbarch.h"
  24
  25 class frame_info_ptr;
  26
  27 /* Register numbers of various important registers.  */
  28
  29 enum m68k_regnum
  30 {
  31   M68K_D0_REGNUM = 0,
  32   M68K_D1_REGNUM = 1,
  33   M68K_D2_REGNUM = 2,
  34   M68K_D7_REGNUM = 7,
  35   M68K_A0_REGNUM = 8,
  36   M68K_A1_REGNUM = 9,
  37   M68K_A2_REGNUM = 10,
  38   M68K_FP_REGNUM = 14,          /* Address of executing stack frame.  */
  39   M68K_SP_REGNUM = 15,          /* Address of top of stack.  */
  40   M68K_PS_REGNUM = 16,          /* Processor status.  */
  41   M68K_PC_REGNUM = 17,          /* Program counter.  */
  42   M68K_FP0_REGNUM = 18,         /* Floating point register 0.  */
  43   M68K_FPC_REGNUM = 26,         /* 68881 control register.  */
  44   M68K_FPS_REGNUM = 27,         /* 68881 status register.  */
  45   M68K_FPI_REGNUM = 28
  46 };
  47
  48 /* Number of machine registers.  */
  49 #define M68K_NUM_REGS   (M68K_FPI_REGNUM + 1)
  50
  51 /* Size of the largest register.  */
  52 #define M68K_MAX_REGISTER_SIZE  12
  53
  54 /* Convention for returning structures.  */
  55
  56 enum struct_return
  57 {
  58   pcc_struct_return,            /* Return "short" structures in memory.  */
  59   reg_struct_return             /* Return "short" structures in registers.  */
  60 };
  61
  62 /* Particular flavour of m68k.  */
  63 enum m68k_flavour
  64   {
  65     m68k_no_flavour,
  66     m68k_coldfire_flavour,
  67     m68k_fido_flavour
  68   };
  69
  70 /* Target-dependent structure in gdbarch.  */
  71
  72 struct m68k_gdbarch_tdep : gdbarch_tdep_base
  73 {
  74   /* Offset to PC value in the jump buffer.  If this is negative,
  75      longjmp support will be disabled.  */
  76   int jb_pc = 0;
  77   /* The size of each entry in the jump buffer.  */
  78   size_t jb_elt_size = 0;
  79
  80   /* Register in which the address to store a structure value is
  81      passed to a function.  */
  82   int struct_value_regnum = 0;
  83
  84   /* Register in which a pointer value is returned.  In the SVR4 ABI,
  85      this is %a0, but in GCC's "embedded" ABI, this is %d0.  */
  86   int pointer_result_regnum = 0;
  87
  88   /* Convention for returning structures.  */
  89   enum struct_return struct_return {};
  90
  91   /* Convention for returning floats.  zero in int regs, non-zero in float.  */
  92   int float_return = 0;
  93
  94   /* The particular flavour of m68k.  */
  95   enum m68k_flavour flavour {};
  96
  97   /* Flag set if the floating point registers are present, or assumed
  98      to be present.  */
  99   int fpregs_present = 0;
 100
 101    /* ISA-specific data types.  */
 102   struct type *m68k_ps_type = nullptr;
 103   struct type *m68881_ext_type = nullptr;
 104 };
 105
 106 /* Initialize a SVR4 architecture variant.  */
 107 extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
 108 \f
 109
 110 /* Functions exported from m68k-bsd-tdep.c.  */
 111
 112 extern int m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum);
 113
 114 #endif /* m68k-tdep.h */