164 lines
4.4 KiB
C
164 lines
4.4 KiB
C
/* Target-dependent code for Motorola 68000 BSD's.
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Copyright (C) 2004-2017 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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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "gdbtypes.h"
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#include "m68k-tdep.h"
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#include "solib-svr4.h"
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/* Core file support. */
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/* Sizeof `struct reg' in <machine/reg.h>. */
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#define M68KBSD_SIZEOF_GREGS (18 * 4)
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/* Sizeof `struct fpreg' in <machine/reg.h. */
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#define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
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int
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m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
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{
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int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
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if (regnum >= M68K_FPC_REGNUM)
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return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
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return (regnum - M68K_FP0_REGNUM) * fp_len;
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}
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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m68kbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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const gdb_byte *regs = (const gdb_byte *) fpregs;
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int i;
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gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
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for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i,
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regs + m68kbsd_fpreg_offset (gdbarch, i));
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}
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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m68kbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = (const gdb_byte *) gregs;
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int i;
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gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
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for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + i * 4);
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}
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if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
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{
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regs += M68KBSD_SIZEOF_GREGS;
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len -= M68KBSD_SIZEOF_GREGS;
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m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
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}
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}
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/* Motorola 68000 register sets. */
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static const struct regset m68kbsd_gregset =
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{
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NULL,
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m68kbsd_supply_gregset,
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NULL,
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REGSET_VARIABLE_SIZE
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};
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static const struct regset m68kbsd_fpregset =
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{
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NULL,
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m68kbsd_supply_fpregset
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};
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/* Iterate over core file register note sections. */
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static void
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m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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cb (".reg", M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset, NULL, cb_data);
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cb (".reg2", M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, NULL, cb_data);
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}
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static void
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m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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tdep->jb_pc = 5;
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tdep->jb_elt_size = 4;
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set_gdbarch_decr_pc_after_break (gdbarch, 2);
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, m68kbsd_iterate_over_regset_sections);
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/* NetBSD ELF uses the SVR4 ABI. */
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m68k_svr4_init_abi (info, gdbarch);
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tdep->struct_return = pcc_struct_return;
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/* NetBSD ELF uses SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_m68kbsd_tdep (void);
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void
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_initialize_m68kbsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD,
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m68kbsd_init_abi);
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}
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