1 /* Target-dependent code for Motorola 68000 BSD's.
3 Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc.
5 This file is part of GDB.
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 2 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
23 #include "arch-utils.h"
28 #include "trad-frame.h"
29 #include "tramp-frame.h"
31 #include "gdb_assert.h"
32 #include "gdb_string.h"
34 #include "m68k-tdep.h"
35 #include "solib-svr4.h"
37 /* Core file support. */
39 /* Sizeof `struct reg' in <machine/reg.h>. */
40 #define M68KBSD_SIZEOF_GREGS (18 * 4)
42 /* Sizeof `struct fpreg' in <machine/reg.h. */
43 #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
46 m68kbsd_fpreg_offset (int regnum
)
48 int fp_len
= TYPE_LENGTH (gdbarch_register_type (current_gdbarch
, regnum
));
50 if (regnum
>= M68K_FPC_REGNUM
)
51 return 8 * fp_len
+ (regnum
- M68K_FPC_REGNUM
) * 4;
53 return (regnum
- M68K_FP0_REGNUM
) * fp_len
;
56 /* Supply register REGNUM from the buffer specified by FPREGS and LEN
57 in the floating-point register set REGSET to register cache
58 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
61 m68kbsd_supply_fpregset (const struct regset
*regset
,
62 struct regcache
*regcache
,
63 int regnum
, const void *fpregs
, size_t len
)
65 const gdb_byte
*regs
= fpregs
;
68 gdb_assert (len
>= M68KBSD_SIZEOF_FPREGS
);
70 for (i
= M68K_FP0_REGNUM
; i
<= M68K_PC_REGNUM
; i
++)
72 if (regnum
== i
|| regnum
== -1)
73 regcache_raw_supply (regcache
, i
, regs
+ m68kbsd_fpreg_offset (i
));
77 /* Supply register REGNUM from the buffer specified by GREGS and LEN
78 in the general-purpose register set REGSET to register cache
79 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
82 m68kbsd_supply_gregset (const struct regset
*regset
,
83 struct regcache
*regcache
,
84 int regnum
, const void *gregs
, size_t len
)
86 const gdb_byte
*regs
= gregs
;
89 gdb_assert (len
>= M68KBSD_SIZEOF_GREGS
);
91 for (i
= M68K_D0_REGNUM
; i
<= M68K_PC_REGNUM
; i
++)
93 if (regnum
== i
|| regnum
== -1)
94 regcache_raw_supply (regcache
, i
, regs
+ i
* 4);
97 if (len
>= M68KBSD_SIZEOF_GREGS
+ M68KBSD_SIZEOF_FPREGS
)
99 regs
+= M68KBSD_SIZEOF_GREGS
;
100 len
-= M68KBSD_SIZEOF_GREGS
;
101 m68kbsd_supply_fpregset (regset
, regcache
, regnum
, regs
, len
);
105 /* Motorola 68000 register sets. */
107 static struct regset m68kbsd_gregset
=
110 m68kbsd_supply_gregset
113 static struct regset m68kbsd_fpregset
=
116 m68kbsd_supply_fpregset
119 /* Return the appropriate register set for the core section identified
120 by SECT_NAME and SECT_SIZE. */
122 static const struct regset
*
123 m68kbsd_regset_from_core_section (struct gdbarch
*gdbarch
,
124 const char *sect_name
, size_t sect_size
)
126 if (strcmp (sect_name
, ".reg") == 0 && sect_size
>= M68KBSD_SIZEOF_GREGS
)
127 return &m68kbsd_gregset
;
129 if (strcmp (sect_name
, ".reg2") == 0 && sect_size
>= M68KBSD_SIZEOF_FPREGS
)
130 return &m68kbsd_fpregset
;
136 /* Signal trampolines. */
139 m68kobsd_sigtramp_cache_init (const struct tramp_frame
*self
,
140 struct frame_info
*next_frame
,
141 struct trad_frame_cache
*this_cache
,
144 CORE_ADDR addr
, base
, pc
;
147 base
= frame_unwind_register_unsigned (next_frame
, M68K_SP_REGNUM
);
149 /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
150 pointer. Adjust the frame base accordingly. */
151 pc
= frame_unwind_register_unsigned (next_frame
, M68K_PC_REGNUM
);
155 /* Get frame pointer, stack pointer, program counter and processor
156 state from `struct sigcontext'. */
157 addr
= get_frame_memory_unsigned (next_frame
, base
+ 8, 4);
158 trad_frame_set_reg_addr (this_cache
, M68K_FP_REGNUM
, addr
+ 8);
159 trad_frame_set_reg_addr (this_cache
, M68K_SP_REGNUM
, addr
+ 12);
160 trad_frame_set_reg_addr (this_cache
, M68K_PC_REGNUM
, addr
+ 20);
161 trad_frame_set_reg_addr (this_cache
, M68K_PS_REGNUM
, addr
+ 24);
163 /* The sc_ap member of `struct sigcontext' points to additional
164 hardware state. Here we find the missing registers. */
165 addr
= get_frame_memory_unsigned (next_frame
, addr
+ 16, 4) + 4;
166 for (regnum
= M68K_D0_REGNUM
; regnum
< M68K_FP_REGNUM
; regnum
++, addr
+= 4)
167 trad_frame_set_reg_addr (this_cache
, regnum
, addr
);
169 /* Construct the frame ID using the function start. */
170 trad_frame_set_id (this_cache
, frame_id_build (base
, func
));
173 static const struct tramp_frame m68kobsd_sigtramp
= {
177 { 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
178 { 0x4e90, -1 }, /* jsr %a0@ */
179 { 0x588f, -1 }, /* addql #4,%sp */
180 { 0x4e41, -1 }, /* trap #1 */
181 { 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
182 { 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
183 { 0x4e40, -1 }, /* trap #0 */
184 { TRAMP_SENTINEL_INSN
, -1 }
186 m68kobsd_sigtramp_cache_init
191 m68kbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
193 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
196 tdep
->jb_elt_size
= 4;
198 set_gdbarch_decr_pc_after_break (gdbarch
, 2);
200 set_gdbarch_regset_from_core_section
201 (gdbarch
, m68kbsd_regset_from_core_section
);
204 /* OpenBSD and NetBSD a.out. */
207 m68kbsd_aout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
209 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
211 m68kbsd_init_abi (info
, gdbarch
);
213 tdep
->struct_return
= reg_struct_return
;
215 tramp_frame_prepend_unwinder (gdbarch
, &m68kobsd_sigtramp
);
221 m68kbsd_elf_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
223 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
225 m68kbsd_init_abi (info
, gdbarch
);
227 /* NetBSD ELF uses the SVR4 ABI. */
228 m68k_svr4_init_abi (info
, gdbarch
);
229 tdep
->struct_return
= pcc_struct_return
;
231 /* NetBSD ELF uses SVR4-style shared libraries. */
232 set_solib_svr4_fetch_link_map_offsets
233 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
237 static enum gdb_osabi
238 m68kbsd_aout_osabi_sniffer (bfd
*abfd
)
240 if (strcmp (bfd_get_target (abfd
), "a.out-m68k-netbsd") == 0
241 || strcmp (bfd_get_target (abfd
), "a.out-m68k4k-netbsd") == 0)
242 return GDB_OSABI_NETBSD_AOUT
;
244 return GDB_OSABI_UNKNOWN
;
247 static enum gdb_osabi
248 m68kbsd_core_osabi_sniffer (bfd
*abfd
)
250 if (strcmp (bfd_get_target (abfd
), "netbsd-core") == 0)
251 return GDB_OSABI_NETBSD_AOUT
;
253 return GDB_OSABI_UNKNOWN
;
257 /* Provide a prototype to silence -Wmissing-prototypes. */
258 void _initialize_m68kbsd_tdep (void);
261 _initialize_m68kbsd_tdep (void)
263 gdbarch_register_osabi_sniffer (bfd_arch_m68k
, bfd_target_aout_flavour
,
264 m68kbsd_aout_osabi_sniffer
);
266 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
267 gdbarch_register_osabi_sniffer (bfd_arch_m68k
, bfd_target_unknown_flavour
,
268 m68kbsd_core_osabi_sniffer
);
270 gdbarch_register_osabi (bfd_arch_m68k
, 0, GDB_OSABI_NETBSD_AOUT
,
271 m68kbsd_aout_init_abi
);
272 gdbarch_register_osabi (bfd_arch_m68k
, 0, GDB_OSABI_NETBSD_ELF
,
273 m68kbsd_elf_init_abi
);