1 /* Target-dependent code for Motorola 68000 BSD's.
3 Copyright (C) 2004-2014 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 3 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, see <http://www.gnu.org/licenses/>. */
21 #include "arch-utils.h"
26 #include "trad-frame.h"
27 #include "tramp-frame.h"
30 #include "m68k-tdep.h"
31 #include "solib-svr4.h"
33 /* Core file support. */
35 /* Sizeof `struct reg' in <machine/reg.h>. */
36 #define M68KBSD_SIZEOF_GREGS (18 * 4)
38 /* Sizeof `struct fpreg' in <machine/reg.h. */
39 #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
42 m68kbsd_fpreg_offset (struct gdbarch
*gdbarch
, int regnum
)
44 int fp_len
= TYPE_LENGTH (gdbarch_register_type (gdbarch
, regnum
));
46 if (regnum
>= M68K_FPC_REGNUM
)
47 return 8 * fp_len
+ (regnum
- M68K_FPC_REGNUM
) * 4;
49 return (regnum
- M68K_FP0_REGNUM
) * fp_len
;
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. */
57 m68kbsd_supply_fpregset (const struct regset
*regset
,
58 struct regcache
*regcache
,
59 int regnum
, const void *fpregs
, size_t len
)
61 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
62 const gdb_byte
*regs
= fpregs
;
65 gdb_assert (len
>= M68KBSD_SIZEOF_FPREGS
);
67 for (i
= M68K_FP0_REGNUM
; i
<= M68K_PC_REGNUM
; i
++)
69 if (regnum
== i
|| regnum
== -1)
70 regcache_raw_supply (regcache
, i
,
71 regs
+ m68kbsd_fpreg_offset (gdbarch
, i
));
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. */
80 m68kbsd_supply_gregset (const struct regset
*regset
,
81 struct regcache
*regcache
,
82 int regnum
, const void *gregs
, size_t len
)
84 const gdb_byte
*regs
= gregs
;
87 gdb_assert (len
>= M68KBSD_SIZEOF_GREGS
);
89 for (i
= M68K_D0_REGNUM
; i
<= M68K_PC_REGNUM
; i
++)
91 if (regnum
== i
|| regnum
== -1)
92 regcache_raw_supply (regcache
, i
, regs
+ i
* 4);
95 if (len
>= M68KBSD_SIZEOF_GREGS
+ M68KBSD_SIZEOF_FPREGS
)
97 regs
+= M68KBSD_SIZEOF_GREGS
;
98 len
-= M68KBSD_SIZEOF_GREGS
;
99 m68kbsd_supply_fpregset (regset
, regcache
, regnum
, regs
, len
);
103 /* Motorola 68000 register sets. */
105 static const struct regset m68kbsd_gregset
=
108 m68kbsd_supply_gregset
111 static const struct regset m68kbsd_fpregset
=
114 m68kbsd_supply_fpregset
117 /* Iterate over core file register note sections. */
120 m68kbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
121 iterate_over_regset_sections_cb
*cb
,
123 const struct regcache
*regcache
)
125 cb (".reg", M68KBSD_SIZEOF_GREGS
, &m68kbsd_gregset
, NULL
, cb_data
);
126 cb (".reg2", M68KBSD_SIZEOF_FPREGS
, &m68kbsd_fpregset
, NULL
, cb_data
);
130 /* Signal trampolines. */
133 m68kobsd_sigtramp_cache_init (const struct tramp_frame
*self
,
134 struct frame_info
*this_frame
,
135 struct trad_frame_cache
*this_cache
,
138 CORE_ADDR addr
, base
, pc
;
141 base
= get_frame_register_unsigned (this_frame
, M68K_SP_REGNUM
);
143 /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
144 pointer. Adjust the frame base accordingly. */
145 pc
= get_frame_register_unsigned (this_frame
, M68K_PC_REGNUM
);
149 /* Get frame pointer, stack pointer, program counter and processor
150 state from `struct sigcontext'. */
151 addr
= get_frame_memory_unsigned (this_frame
, base
+ 8, 4);
152 trad_frame_set_reg_addr (this_cache
, M68K_FP_REGNUM
, addr
+ 8);
153 trad_frame_set_reg_addr (this_cache
, M68K_SP_REGNUM
, addr
+ 12);
154 trad_frame_set_reg_addr (this_cache
, M68K_PC_REGNUM
, addr
+ 20);
155 trad_frame_set_reg_addr (this_cache
, M68K_PS_REGNUM
, addr
+ 24);
157 /* The sc_ap member of `struct sigcontext' points to additional
158 hardware state. Here we find the missing registers. */
159 addr
= get_frame_memory_unsigned (this_frame
, addr
+ 16, 4) + 4;
160 for (regnum
= M68K_D0_REGNUM
; regnum
< M68K_FP_REGNUM
; regnum
++, addr
+= 4)
161 trad_frame_set_reg_addr (this_cache
, regnum
, addr
);
163 /* Construct the frame ID using the function start. */
164 trad_frame_set_id (this_cache
, frame_id_build (base
, func
));
167 static const struct tramp_frame m68kobsd_sigtramp
= {
171 { 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
172 { 0x4e90, -1 }, /* jsr %a0@ */
173 { 0x588f, -1 }, /* addql #4,%sp */
174 { 0x4e41, -1 }, /* trap #1 */
175 { 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
176 { 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
177 { 0x4e40, -1 }, /* trap #0 */
178 { TRAMP_SENTINEL_INSN
, -1 }
180 m68kobsd_sigtramp_cache_init
185 m68kbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
187 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
190 tdep
->jb_elt_size
= 4;
192 set_gdbarch_decr_pc_after_break (gdbarch
, 2);
194 set_gdbarch_iterate_over_regset_sections
195 (gdbarch
, m68kbsd_iterate_over_regset_sections
);
198 /* OpenBSD and NetBSD a.out. */
201 m68kbsd_aout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
203 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
205 m68kbsd_init_abi (info
, gdbarch
);
207 tdep
->struct_return
= reg_struct_return
;
209 tramp_frame_prepend_unwinder (gdbarch
, &m68kobsd_sigtramp
);
215 m68kbsd_elf_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
217 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
219 m68kbsd_init_abi (info
, gdbarch
);
221 /* NetBSD ELF uses the SVR4 ABI. */
222 m68k_svr4_init_abi (info
, gdbarch
);
223 tdep
->struct_return
= pcc_struct_return
;
225 /* NetBSD ELF uses SVR4-style shared libraries. */
226 set_solib_svr4_fetch_link_map_offsets
227 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
231 static enum gdb_osabi
232 m68kbsd_aout_osabi_sniffer (bfd
*abfd
)
234 if (strcmp (bfd_get_target (abfd
), "a.out-m68k-netbsd") == 0
235 || strcmp (bfd_get_target (abfd
), "a.out-m68k4k-netbsd") == 0)
236 return GDB_OSABI_NETBSD_AOUT
;
238 return GDB_OSABI_UNKNOWN
;
241 static enum gdb_osabi
242 m68kbsd_core_osabi_sniffer (bfd
*abfd
)
244 if (strcmp (bfd_get_target (abfd
), "netbsd-core") == 0)
245 return GDB_OSABI_NETBSD_AOUT
;
247 return GDB_OSABI_UNKNOWN
;
251 /* Provide a prototype to silence -Wmissing-prototypes. */
252 void _initialize_m68kbsd_tdep (void);
255 _initialize_m68kbsd_tdep (void)
257 gdbarch_register_osabi_sniffer (bfd_arch_m68k
, bfd_target_aout_flavour
,
258 m68kbsd_aout_osabi_sniffer
);
260 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
261 gdbarch_register_osabi_sniffer (bfd_arch_m68k
, bfd_target_unknown_flavour
,
262 m68kbsd_core_osabi_sniffer
);
264 gdbarch_register_osabi (bfd_arch_m68k
, 0, GDB_OSABI_NETBSD_AOUT
,
265 m68kbsd_aout_init_abi
);
266 gdbarch_register_osabi (bfd_arch_m68k
, 0, GDB_OSABI_NETBSD_ELF
,
267 m68kbsd_elf_init_abi
);