1 /* Target-dependent code for Motorola 68000 BSD's.
3 Copyright (C) 2004-2015 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
,
113 static const struct regset m68kbsd_fpregset
=
116 m68kbsd_supply_fpregset
119 /* Iterate over core file register note sections. */
122 m68kbsd_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
123 iterate_over_regset_sections_cb
*cb
,
125 const struct regcache
*regcache
)
127 cb (".reg", M68KBSD_SIZEOF_GREGS
, &m68kbsd_gregset
, NULL
, cb_data
);
128 cb (".reg2", M68KBSD_SIZEOF_FPREGS
, &m68kbsd_fpregset
, NULL
, cb_data
);
132 /* Signal trampolines. */
135 m68kobsd_sigtramp_cache_init (const struct tramp_frame
*self
,
136 struct frame_info
*this_frame
,
137 struct trad_frame_cache
*this_cache
,
140 CORE_ADDR addr
, base
, pc
;
143 base
= get_frame_register_unsigned (this_frame
, M68K_SP_REGNUM
);
145 /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
146 pointer. Adjust the frame base accordingly. */
147 pc
= get_frame_register_unsigned (this_frame
, M68K_PC_REGNUM
);
151 /* Get frame pointer, stack pointer, program counter and processor
152 state from `struct sigcontext'. */
153 addr
= get_frame_memory_unsigned (this_frame
, base
+ 8, 4);
154 trad_frame_set_reg_addr (this_cache
, M68K_FP_REGNUM
, addr
+ 8);
155 trad_frame_set_reg_addr (this_cache
, M68K_SP_REGNUM
, addr
+ 12);
156 trad_frame_set_reg_addr (this_cache
, M68K_PC_REGNUM
, addr
+ 20);
157 trad_frame_set_reg_addr (this_cache
, M68K_PS_REGNUM
, addr
+ 24);
159 /* The sc_ap member of `struct sigcontext' points to additional
160 hardware state. Here we find the missing registers. */
161 addr
= get_frame_memory_unsigned (this_frame
, addr
+ 16, 4) + 4;
162 for (regnum
= M68K_D0_REGNUM
; regnum
< M68K_FP_REGNUM
; regnum
++, addr
+= 4)
163 trad_frame_set_reg_addr (this_cache
, regnum
, addr
);
165 /* Construct the frame ID using the function start. */
166 trad_frame_set_id (this_cache
, frame_id_build (base
, func
));
169 static const struct tramp_frame m68kobsd_sigtramp
= {
173 { 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
174 { 0x4e90, -1 }, /* jsr %a0@ */
175 { 0x588f, -1 }, /* addql #4,%sp */
176 { 0x4e41, -1 }, /* trap #1 */
177 { 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
178 { 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
179 { 0x4e40, -1 }, /* trap #0 */
180 { TRAMP_SENTINEL_INSN
, -1 }
182 m68kobsd_sigtramp_cache_init
187 m68kbsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
189 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
192 tdep
->jb_elt_size
= 4;
194 set_gdbarch_decr_pc_after_break (gdbarch
, 2);
196 set_gdbarch_iterate_over_regset_sections
197 (gdbarch
, m68kbsd_iterate_over_regset_sections
);
200 /* OpenBSD and NetBSD a.out. */
203 m68kbsd_aout_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
205 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
207 m68kbsd_init_abi (info
, gdbarch
);
209 tdep
->struct_return
= reg_struct_return
;
211 tramp_frame_prepend_unwinder (gdbarch
, &m68kobsd_sigtramp
);
217 m68kbsd_elf_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
219 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
221 m68kbsd_init_abi (info
, gdbarch
);
223 /* NetBSD ELF uses the SVR4 ABI. */
224 m68k_svr4_init_abi (info
, gdbarch
);
225 tdep
->struct_return
= pcc_struct_return
;
227 /* NetBSD ELF uses SVR4-style shared libraries. */
228 set_solib_svr4_fetch_link_map_offsets
229 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
233 static enum gdb_osabi
234 m68kbsd_aout_osabi_sniffer (bfd
*abfd
)
236 if (strcmp (bfd_get_target (abfd
), "a.out-m68k-netbsd") == 0
237 || strcmp (bfd_get_target (abfd
), "a.out-m68k4k-netbsd") == 0)
238 return GDB_OSABI_NETBSD_AOUT
;
240 return GDB_OSABI_UNKNOWN
;
243 static enum gdb_osabi
244 m68kbsd_core_osabi_sniffer (bfd
*abfd
)
246 if (strcmp (bfd_get_target (abfd
), "netbsd-core") == 0)
247 return GDB_OSABI_NETBSD_AOUT
;
249 return GDB_OSABI_UNKNOWN
;
253 /* Provide a prototype to silence -Wmissing-prototypes. */
254 void _initialize_m68kbsd_tdep (void);
257 _initialize_m68kbsd_tdep (void)
259 gdbarch_register_osabi_sniffer (bfd_arch_m68k
, bfd_target_aout_flavour
,
260 m68kbsd_aout_osabi_sniffer
);
262 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
263 gdbarch_register_osabi_sniffer (bfd_arch_m68k
, bfd_target_unknown_flavour
,
264 m68kbsd_core_osabi_sniffer
);
266 gdbarch_register_osabi (bfd_arch_m68k
, 0, GDB_OSABI_NETBSD_AOUT
,
267 m68kbsd_aout_init_abi
);
268 gdbarch_register_osabi (bfd_arch_m68k
, 0, GDB_OSABI_NETBSD_ELF
,
269 m68kbsd_elf_init_abi
);