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- /* Target-dependent code for Motorola 68000 BSD's.
- Copyright (C) 2004-2022 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/>. */
- #include "defs.h"
- #include "arch-utils.h"
- #include "frame.h"
- #include "osabi.h"
- #include "regcache.h"
- #include "regset.h"
- #include "trad-frame.h"
- #include "tramp-frame.h"
- #include "gdbtypes.h"
- #include "m68k-tdep.h"
- #include "solib-svr4.h"
- /* Core file support. */
- /* Sizeof `struct reg' in <machine/reg.h>. */
- #define M68KBSD_SIZEOF_GREGS (18 * 4)
- /* Sizeof `struct fpreg' in <machine/reg.h. */
- #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
- int
- m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
- {
- int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
-
- if (regnum >= M68K_FPC_REGNUM)
- return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
- return (regnum - M68K_FP0_REGNUM) * fp_len;
- }
- /* Supply register REGNUM from the buffer specified by FPREGS and LEN
- in the floating-point register set REGSET to register cache
- REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
- static void
- m68kbsd_supply_fpregset (const struct regset *regset,
- struct regcache *regcache,
- int regnum, const void *fpregs, size_t len)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- const gdb_byte *regs = (const gdb_byte *) fpregs;
- int i;
- gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
- for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
- {
- if (regnum == i || regnum == -1)
- regcache->raw_supply (i, regs + m68kbsd_fpreg_offset (gdbarch, i));
- }
- }
- /* Supply register REGNUM from the buffer specified by GREGS and LEN
- in the general-purpose register set REGSET to register cache
- REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
- static void
- m68kbsd_supply_gregset (const struct regset *regset,
- struct regcache *regcache,
- int regnum, const void *gregs, size_t len)
- {
- const gdb_byte *regs = (const gdb_byte *) gregs;
- int i;
- gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
- for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
- {
- if (regnum == i || regnum == -1)
- regcache->raw_supply (i, regs + i * 4);
- }
- if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
- {
- regs += M68KBSD_SIZEOF_GREGS;
- len -= M68KBSD_SIZEOF_GREGS;
- m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
- }
- }
- /* Motorola 68000 register sets. */
- static const struct regset m68kbsd_gregset =
- {
- NULL,
- m68kbsd_supply_gregset,
- NULL,
- REGSET_VARIABLE_SIZE
- };
- static const struct regset m68kbsd_fpregset =
- {
- NULL,
- m68kbsd_supply_fpregset
- };
- /* Iterate over core file register note sections. */
- static void
- m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
- iterate_over_regset_sections_cb *cb,
- void *cb_data,
- const struct regcache *regcache)
- {
- cb (".reg", M68KBSD_SIZEOF_GREGS, M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset,
- NULL, cb_data);
- cb (".reg2", M68KBSD_SIZEOF_FPREGS, M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset,
- NULL, cb_data);
- }
- static void
- m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
- {
- m68k_gdbarch_tdep *tdep = (m68k_gdbarch_tdep *) gdbarch_tdep (gdbarch);
- tdep->jb_pc = 5;
- tdep->jb_elt_size = 4;
- set_gdbarch_decr_pc_after_break (gdbarch, 2);
- set_gdbarch_iterate_over_regset_sections
- (gdbarch, m68kbsd_iterate_over_regset_sections);
- /* NetBSD ELF uses the SVR4 ABI. */
- m68k_svr4_init_abi (info, gdbarch);
- tdep->struct_return = pcc_struct_return;
- /* NetBSD ELF uses SVR4-style shared libraries. */
- set_solib_svr4_fetch_link_map_offsets
- (gdbarch, svr4_ilp32_fetch_link_map_offsets);
- }
- void _initialize_m68kbsd_tdep ();
- void
- _initialize_m68kbsd_tdep ()
- {
- gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD,
- m68kbsd_init_abi);
- }
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