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 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
24struct frame_info;
25
26/* Register numbers of various important registers.  */
27
28enum 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
55enum 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.  */
62enum m68k_flavour
63  {
64    m68k_no_flavour,
65    m68k_coldfire_flavour,
66    m68k_fido_flavour
67  };
68
69/* Target-dependent structure in gdbarch.  */
70
71struct 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.  */
98extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
99
100
101/* Functions exported from m68kbsd-tdep.c.  */
102
103extern int m68kbsd_fpreg_offset (int regnum);
104
105#endif /* m68k-tdep.h */
106