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/* Target-dependent code for the Motorola 68000 series.
Copyright (C) 1990-2020 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef M68K_TDEP_H
#define M68K_TDEP_H
struct frame_info;
/* Register numbers of various important registers. */
enum m68k_regnum
{
M68K_D0_REGNUM = 0,
M68K_D1_REGNUM = 1,
M68K_D2_REGNUM = 2,
M68K_D7_REGNUM = 7,
M68K_A0_REGNUM = 8,
M68K_A1_REGNUM = 9,
M68K_A2_REGNUM = 10,
M68K_FP_REGNUM = 14, /* Address of executing stack frame. */
M68K_SP_REGNUM = 15, /* Address of top of stack. */
M68K_PS_REGNUM = 16, /* Processor status. */
M68K_PC_REGNUM = 17, /* Program counter. */
M68K_FP0_REGNUM = 18, /* Floating point register 0. */
M68K_FPC_REGNUM = 26, /* 68881 control register. */
M68K_FPS_REGNUM = 27, /* 68881 status register. */
M68K_FPI_REGNUM = 28
};
/* Number of machine registers. */
#define M68K_NUM_REGS (M68K_FPI_REGNUM + 1)
/* Size of the largest register. */
#define M68K_MAX_REGISTER_SIZE 12
/* Convention for returning structures. */
enum struct_return
{
pcc_struct_return, /* Return "short" structures in memory. */
reg_struct_return /* Return "short" structures in registers. */
};
/* Particular flavour of m68k. */
enum m68k_flavour
{
m68k_no_flavour,
m68k_coldfire_flavour,
m68k_fido_flavour
};
/* Target-dependent structure in gdbarch. */
struct gdbarch_tdep
{
/* Offset to PC value in the jump buffer. If this is negative,
longjmp support will be disabled. */
int jb_pc;
/* The size of each entry in the jump buffer. */
size_t jb_elt_size;
/* Register in which the address to store a structure value is
passed to a function. */
int struct_value_regnum;
/* Register in which a pointer value is returned. In the SVR4 ABI,
this is %a0, but in GCC's "embedded" ABI, this is %d0. */
int pointer_result_regnum;
/* Convention for returning structures. */
enum struct_return struct_return;
/* Convention for returning floats. zero in int regs, non-zero in float. */
int float_return;
/* The particular flavour of m68k. */
enum m68k_flavour flavour;
/* Flag set if the floating point registers are present, or assumed
to be present. */
int fpregs_present;
/* ISA-specific data types. */
struct type *m68k_ps_type;
struct type *m68881_ext_type;
};
/* Initialize a SVR4 architecture variant. */
extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
/* Functions exported from m68k-bsd-tdep.c. */
extern int m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum);
#endif /* m68k-tdep.h */
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