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m68k-bsd-tdep.c revision 1.1 
      1 /* Target-dependent code for Motorola 68000 BSD's.
      2 
      3    Copyright (C) 2004-2017 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 "solib-svr4.h"
     32 
     33 /* Core file support.  */
     34 
     35 /* Sizeof `struct reg' in <machine/reg.h>.  */
     36 #define M68KBSD_SIZEOF_GREGS	(18 * 4)
     37 
     38 /* Sizeof `struct fpreg' in <machine/reg.h.  */
     39 #define M68KBSD_SIZEOF_FPREGS	(((8 * 3) + 3) * 4)
     40 
     41 int
     42 m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
     43 {
     44   int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
     45 
     46   if (regnum >= M68K_FPC_REGNUM)
     47     return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
     48 
     49   return (regnum - M68K_FP0_REGNUM) * fp_len;
     50 }
     51 
     52 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
     53    in the floating-point register set REGSET to register cache
     54    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
     55 
     56 static void
     57 m68kbsd_supply_fpregset (const struct regset *regset,
     58 			 struct regcache *regcache,
     59 			 int regnum, const void *fpregs, size_t len)
     60 {
     61   struct gdbarch *gdbarch = get_regcache_arch (regcache);
     62   const gdb_byte *regs = (const gdb_byte *) fpregs;
     63   int i;
     64 
     65   gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
     66 
     67   for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
     68     {
     69       if (regnum == i || regnum == -1)
     70 	regcache_raw_supply (regcache, i,
     71 			     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 (regcache, 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_gregset, NULL, cb_data);
    128   cb (".reg2", M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, NULL, cb_data);
    129 }
    130 
    131 
    133 static void
    134 m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
    135 {
    136   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
    137 
    138   tdep->jb_pc = 5;
    139   tdep->jb_elt_size = 4;
    140 
    141   set_gdbarch_decr_pc_after_break (gdbarch, 2);
    142 
    143   set_gdbarch_iterate_over_regset_sections
    144     (gdbarch, m68kbsd_iterate_over_regset_sections);
    145 
    146   /* NetBSD ELF uses the SVR4 ABI.  */
    147   m68k_svr4_init_abi (info, gdbarch);
    148   tdep->struct_return = pcc_struct_return;
    149 
    150   /* NetBSD ELF uses SVR4-style shared libraries.  */
    151   set_solib_svr4_fetch_link_map_offsets
    152     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
    153 }
    154 
    155 
    157 /* Provide a prototype to silence -Wmissing-prototypes.  */
    158 void _initialize_m68kbsd_tdep (void);
    159 
    160 void
    161 _initialize_m68kbsd_tdep (void)
    162 {
    163   gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD,
    164 			  m68kbsd_init_abi);
    165 }
    166