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345bd07cce
I would like to be able to use non-trivial types in gdbarch_tdep types. This is not possible at the moment (in theory), because of the one definition rule. To allow it, rename all gdbarch_tdep types to <arch>_gdbarch_tdep, and make them inherit from a gdbarch_tdep base class. The inheritance is necessary to be able to pass pointers to all these <arch>_gdbarch_tdep objects to gdbarch_alloc, which takes a pointer to gdbarch_tdep. These objects are never deleted through a base class pointer, so I didn't include a virtual destructor. In the future, if gdbarch objects deletable, I could imagine that the gdbarch_tdep objects could become owned by the gdbarch objects, and then it would become useful to have a virtual destructor (so that the gdbarch object can delete the owned gdbarch_tdep object). But that's not necessary right now. It turns out that RISC-V already has a gdbarch_tdep that is non-default-constructible, so that provides a good motivation for this change. Most changes are fairly straightforward, mostly needing to add some casts all over the place. There is however the xtensa architecture, doing its own little weird thing to define its gdbarch_tdep. I did my best to adapt it, but I can't test those changes. Change-Id: Ic001903f91ddd106bd6ca09a79dabe8df2d69f3b
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* Target-dependent code for the Motorola 68000 series.
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Copyright (C) 1990-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef M68K_TDEP_H
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#define M68K_TDEP_H
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struct frame_info;
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/* Register numbers of various important registers. */
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enum m68k_regnum
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{
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M68K_D0_REGNUM = 0,
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M68K_D1_REGNUM = 1,
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M68K_D2_REGNUM = 2,
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M68K_D7_REGNUM = 7,
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M68K_A0_REGNUM = 8,
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M68K_A1_REGNUM = 9,
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M68K_A2_REGNUM = 10,
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M68K_FP_REGNUM = 14, /* Address of executing stack frame. */
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M68K_SP_REGNUM = 15, /* Address of top of stack. */
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M68K_PS_REGNUM = 16, /* Processor status. */
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M68K_PC_REGNUM = 17, /* Program counter. */
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M68K_FP0_REGNUM = 18, /* Floating point register 0. */
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M68K_FPC_REGNUM = 26, /* 68881 control register. */
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M68K_FPS_REGNUM = 27, /* 68881 status register. */
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M68K_FPI_REGNUM = 28
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};
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/* Number of machine registers. */
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#define M68K_NUM_REGS (M68K_FPI_REGNUM + 1)
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/* Size of the largest register. */
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#define M68K_MAX_REGISTER_SIZE 12
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/* Convention for returning structures. */
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enum struct_return
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{
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pcc_struct_return, /* Return "short" structures in memory. */
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reg_struct_return /* Return "short" structures in registers. */
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};
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/* Particular flavour of m68k. */
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enum m68k_flavour
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{
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m68k_no_flavour,
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m68k_coldfire_flavour,
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m68k_fido_flavour
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};
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/* Target-dependent structure in gdbarch. */
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struct m68k_gdbarch_tdep : gdbarch_tdep
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{
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/* Offset to PC value in the jump buffer. If this is negative,
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longjmp support will be disabled. */
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int jb_pc = 0;
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/* The size of each entry in the jump buffer. */
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size_t jb_elt_size = 0;
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/* Register in which the address to store a structure value is
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passed to a function. */
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int struct_value_regnum = 0;
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/* Register in which a pointer value is returned. In the SVR4 ABI,
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this is %a0, but in GCC's "embedded" ABI, this is %d0. */
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int pointer_result_regnum = 0;
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/* Convention for returning structures. */
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enum struct_return struct_return {};
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/* Convention for returning floats. zero in int regs, non-zero in float. */
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int float_return = 0;
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/* The particular flavour of m68k. */
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enum m68k_flavour flavour {};
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/* Flag set if the floating point registers are present, or assumed
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to be present. */
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int fpregs_present = 0;
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/* ISA-specific data types. */
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struct type *m68k_ps_type = nullptr;
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struct type *m68881_ext_type = nullptr;
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};
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/* Initialize a SVR4 architecture variant. */
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extern void m68k_svr4_init_abi (struct gdbarch_info, struct gdbarch *);
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/* Functions exported from m68k-bsd-tdep.c. */
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extern int m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum);
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#endif /* m68k-tdep.h */
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