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m68k-bsd-tdep.c revision 1.1.1.3.2.1 
      1 /* Target-dependent code for Motorola 68000 BSD's.
      2 
      3    Copyright (C) 2004-2023 Free Software Foundation, Inc.
      4 
      5    This file is part of GDB.
      6 
      7    This program is free software; you can redistribute it and/or modify
      8    it under the terms of the GNU General Public License as published by
      9    the Free Software Foundation; either version 3 of the License, or
     10    (at your option) any later version.
     11 
     12    This program is distributed in the hope that it will be useful,
     13    but WITHOUT ANY WARRANTY; without even the implied warranty of
     14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15    GNU General Public License for more details.
     16 
     17    You should have received a copy of the GNU General Public License
     18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     19 
     20 #include "defs.h"
     21 #include "arch-utils.h"
     22 #include "frame.h"
     23 #include "osabi.h"
     24 #include "regcache.h"
     25 #include "regset.h"
     26 #include "trad-frame.h"
     27 #include "tramp-frame.h"
     28 #include "gdbtypes.h"
     29 
     30 #include "m68k-tdep.h"
     31 #include "netbsd-tdep.h"
     32 #include "solib-svr4.h"
     33 
     34 /* Core file support.  */
     35 
     36 /* Sizeof `struct reg' in <machine/reg.h>.  */
     37 #define M68KBSD_SIZEOF_GREGS	(18 * 4)
     38 
     39 /* Sizeof `struct fpreg' in <machine/reg.h.  */
     40 #define M68KBSD_SIZEOF_FPREGS	(((8 * 3) + 3) * 4)
     41 
     42 int
     43 m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
     44 {
     45   int fp_len = gdbarch_register_type (gdbarch, regnum)->length ();
     46 
     47   if (regnum >= M68K_FPC_REGNUM)
     48     return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
     49 
     50   return (regnum - M68K_FP0_REGNUM) * fp_len;
     51 }
     52 
     53 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
     54    in the floating-point register set REGSET to register cache
     55    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
     56 
     57 static void
     58 m68kbsd_supply_fpregset (const struct regset *regset,
     59 			 struct regcache *regcache,
     60 			 int regnum, const void *fpregs, size_t len)
     61 {
     62   struct gdbarch *gdbarch = regcache->arch ();
     63   const gdb_byte *regs = (const gdb_byte *) fpregs;
     64   int i;
     65 
     66   gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
     67 
     68   for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
     69     {
     70       if (regnum == i || regnum == -1)
     71 	regcache->raw_supply (i, regs + m68kbsd_fpreg_offset (gdbarch, i));
     72     }
     73 }
     74 
     75 /* Supply register REGNUM from the buffer specified by GREGS and LEN
     76    in the general-purpose register set REGSET to register cache
     77    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
     78 
     79 static void
     80 m68kbsd_supply_gregset (const struct regset *regset,
     81 			struct regcache *regcache,
     82 			int regnum, const void *gregs, size_t len)
     83 {
     84   const gdb_byte *regs = (const gdb_byte *) gregs;
     85   int i;
     86 
     87   gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
     88 
     89   for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
     90     {
     91       if (regnum == i || regnum == -1)
     92 	regcache->raw_supply (i, regs + i * 4);
     93     }
     94 
     95   if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
     96     {
     97       regs += M68KBSD_SIZEOF_GREGS;
     98       len -= M68KBSD_SIZEOF_GREGS;
     99       m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
    100     }
    101 }
    102 
    103 /* Motorola 68000 register sets.  */
    104 
    105 static const struct regset m68kbsd_gregset =
    106 {
    107   NULL,
    108   m68kbsd_supply_gregset,
    109   NULL,
    110   REGSET_VARIABLE_SIZE
    111 };
    112 
    113 static const struct regset m68kbsd_fpregset =
    114 {
    115   NULL,
    116   m68kbsd_supply_fpregset
    117 };
    118 
    119 /* Iterate over core file register note sections.  */
    120 
    121 static void
    122 m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
    123 				      iterate_over_regset_sections_cb *cb,
    124 				      void *cb_data,
    125 				      const struct regcache *regcache)
    126 {
    127   cb (".reg", M68KBSD_SIZEOF_GREGS, M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset,
    128       NULL, cb_data);
    129   cb (".reg2", M68KBSD_SIZEOF_FPREGS, M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset,
    130       NULL, cb_data);
    131 }
    132 
    133 
    135 static void
    136 m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
    137 {
    138   m68k_gdbarch_tdep *tdep = gdbarch_tdep<m68k_gdbarch_tdep> (gdbarch);
    139 
    140   nbsd_init_abi (info, gdbarch);
    141 
    142   tdep->jb_pc = 5;
    143   tdep->jb_elt_size = 4;
    144 
    145   set_gdbarch_decr_pc_after_break (gdbarch, 2);
    146 
    147   set_gdbarch_iterate_over_regset_sections
    148     (gdbarch, m68kbsd_iterate_over_regset_sections);
    149 
    150   /* NetBSD ELF uses the SVR4 ABI.  */
    151   m68k_svr4_init_abi (info, gdbarch);
    152   tdep->struct_return = pcc_struct_return;
    153 
    154   /* NetBSD ELF uses SVR4-style shared libraries.  */
    155   set_solib_svr4_fetch_link_map_offsets
    156     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
    157 }
    158 
    159 void _initialize_m68kbsd_tdep ();
    160 void
    161 _initialize_m68kbsd_tdep ()
    162 {
    163   gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD,
    164 			  m68kbsd_init_abi);
    165 }
    166