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1 | /* Target-dependent code for Motorola 68000 BSD's. |
2 | ||
28e7fd62 | 3 | Copyright (C) 2004-2013 Free Software Foundation, Inc. |
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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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
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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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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19 | |
20 | #include "defs.h" | |
21 | #include "arch-utils.h" | |
059cb7d2 | 22 | #include "frame.h" |
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23 | #include "osabi.h" |
24 | #include "regcache.h" | |
25 | #include "regset.h" | |
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26 | #include "trad-frame.h" |
27 | #include "tramp-frame.h" | |
ec20a626 | 28 | #include "gdbtypes.h" |
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29 | |
30 | #include "gdb_assert.h" | |
0e9f083f | 31 | #include <string.h> |
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32 | |
33 | #include "m68k-tdep.h" | |
34 | #include "solib-svr4.h" | |
35 | ||
36 | /* Core file support. */ | |
37 | ||
38 | /* Sizeof `struct reg' in <machine/reg.h>. */ | |
39 | #define M68KBSD_SIZEOF_GREGS (18 * 4) | |
40 | ||
41 | /* Sizeof `struct fpreg' in <machine/reg.h. */ | |
42 | #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4) | |
43 | ||
44 | int | |
6ba38425 | 45 | m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum) |
8f2d3ea0 | 46 | { |
6ba38425 | 47 | int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum)); |
8ed86d01 | 48 | |
8f2d3ea0 | 49 | if (regnum >= M68K_FPC_REGNUM) |
8ed86d01 | 50 | return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4; |
8f2d3ea0 | 51 | |
8ed86d01 | 52 | return (regnum - M68K_FP0_REGNUM) * fp_len; |
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53 | } |
54 | ||
55 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
56 | in the floating-point register set REGSET to register cache | |
57 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
58 | ||
59 | static void | |
60 | m68kbsd_supply_fpregset (const struct regset *regset, | |
61 | struct regcache *regcache, | |
62 | int regnum, const void *fpregs, size_t len) | |
63 | { | |
6ba38425 | 64 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
f5cf7aa1 | 65 | const gdb_byte *regs = fpregs; |
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66 | int i; |
67 | ||
68 | gdb_assert (len >= M68KBSD_SIZEOF_FPREGS); | |
69 | ||
70 | for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
71 | { | |
72 | if (regnum == i || regnum == -1) | |
6ba38425 UW |
73 | regcache_raw_supply (regcache, i, |
74 | regs + m68kbsd_fpreg_offset (gdbarch, i)); | |
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75 | } |
76 | } | |
77 | ||
78 | /* Supply register REGNUM from the buffer specified by GREGS and LEN | |
79 | in the general-purpose register set REGSET to register cache | |
80 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
81 | ||
82 | static void | |
83 | m68kbsd_supply_gregset (const struct regset *regset, | |
84 | struct regcache *regcache, | |
85 | int regnum, const void *gregs, size_t len) | |
86 | { | |
f5cf7aa1 | 87 | const gdb_byte *regs = gregs; |
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88 | int i; |
89 | ||
90 | gdb_assert (len >= M68KBSD_SIZEOF_GREGS); | |
91 | ||
92 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
93 | { | |
94 | if (regnum == i || regnum == -1) | |
95 | regcache_raw_supply (regcache, i, regs + i * 4); | |
96 | } | |
97 | ||
98 | if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS) | |
99 | { | |
100 | regs += M68KBSD_SIZEOF_GREGS; | |
101 | len -= M68KBSD_SIZEOF_GREGS; | |
102 | m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len); | |
103 | } | |
104 | } | |
105 | ||
106 | /* Motorola 68000 register sets. */ | |
107 | ||
108 | static struct regset m68kbsd_gregset = | |
109 | { | |
110 | NULL, | |
111 | m68kbsd_supply_gregset | |
112 | }; | |
113 | ||
114 | static struct regset m68kbsd_fpregset = | |
115 | { | |
116 | NULL, | |
117 | m68kbsd_supply_fpregset | |
118 | }; | |
119 | ||
120 | /* Return the appropriate register set for the core section identified | |
121 | by SECT_NAME and SECT_SIZE. */ | |
122 | ||
123 | static const struct regset * | |
124 | m68kbsd_regset_from_core_section (struct gdbarch *gdbarch, | |
125 | const char *sect_name, size_t sect_size) | |
126 | { | |
127 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS) | |
128 | return &m68kbsd_gregset; | |
129 | ||
130 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS) | |
131 | return &m68kbsd_fpregset; | |
132 | ||
133 | return NULL; | |
134 | } | |
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135 | \f |
136 | ||
137 | /* Signal trampolines. */ | |
138 | ||
139 | static void | |
140 | m68kobsd_sigtramp_cache_init (const struct tramp_frame *self, | |
5366653e | 141 | struct frame_info *this_frame, |
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142 | struct trad_frame_cache *this_cache, |
143 | CORE_ADDR func) | |
144 | { | |
145 | CORE_ADDR addr, base, pc; | |
146 | int regnum; | |
147 | ||
5366653e | 148 | base = get_frame_register_unsigned (this_frame, M68K_SP_REGNUM); |
059cb7d2 MK |
149 | |
150 | /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack | |
151 | pointer. Adjust the frame base accordingly. */ | |
5366653e | 152 | pc = get_frame_register_unsigned (this_frame, M68K_PC_REGNUM); |
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153 | if ((pc - func) > 8) |
154 | base -= 4; | |
155 | ||
156 | /* Get frame pointer, stack pointer, program counter and processor | |
157 | state from `struct sigcontext'. */ | |
5366653e | 158 | addr = get_frame_memory_unsigned (this_frame, base + 8, 4); |
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159 | trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8); |
160 | trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12); | |
161 | trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20); | |
162 | trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24); | |
163 | ||
164 | /* The sc_ap member of `struct sigcontext' points to additional | |
165 | hardware state. Here we find the missing registers. */ | |
5366653e | 166 | addr = get_frame_memory_unsigned (this_frame, addr + 16, 4) + 4; |
059cb7d2 MK |
167 | for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4) |
168 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
169 | ||
170 | /* Construct the frame ID using the function start. */ | |
171 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
172 | } | |
173 | ||
174 | static const struct tramp_frame m68kobsd_sigtramp = { | |
175 | SIGTRAMP_FRAME, | |
176 | 2, | |
177 | { | |
178 | { 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */ | |
179 | { 0x4e90, -1 }, /* jsr %a0@ */ | |
180 | { 0x588f, -1 }, /* addql #4,%sp */ | |
181 | { 0x4e41, -1 }, /* trap #1 */ | |
182 | { 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */ | |
183 | { 0x7001, -1 }, /* moveq #SYS_exit,%d0 */ | |
184 | { 0x4e40, -1 }, /* trap #0 */ | |
185 | { TRAMP_SENTINEL_INSN, -1 } | |
186 | }, | |
187 | m68kobsd_sigtramp_cache_init | |
188 | }; | |
189 | \f | |
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190 | |
191 | static void | |
192 | m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
193 | { | |
194 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
195 | ||
196 | tdep->jb_pc = 5; | |
197 | tdep->jb_elt_size = 4; | |
198 | ||
9418f048 UW |
199 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
200 | ||
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201 | set_gdbarch_regset_from_core_section |
202 | (gdbarch, m68kbsd_regset_from_core_section); | |
203 | } | |
204 | ||
205 | /* OpenBSD and NetBSD a.out. */ | |
206 | ||
207 | static void | |
208 | m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
209 | { | |
210 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
211 | ||
212 | m68kbsd_init_abi (info, gdbarch); | |
213 | ||
214 | tdep->struct_return = reg_struct_return; | |
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215 | |
216 | tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp); | |
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217 | } |
218 | ||
219 | /* NetBSD ELF. */ | |
220 | ||
221 | static void | |
222 | m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
223 | { | |
224 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
225 | ||
226 | m68kbsd_init_abi (info, gdbarch); | |
227 | ||
5ab5aa0f MK |
228 | /* NetBSD ELF uses the SVR4 ABI. */ |
229 | m68k_svr4_init_abi (info, gdbarch); | |
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230 | tdep->struct_return = pcc_struct_return; |
231 | ||
232 | /* NetBSD ELF uses SVR4-style shared libraries. */ | |
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233 | set_solib_svr4_fetch_link_map_offsets |
234 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
235 | } | |
236 | \f | |
237 | ||
238 | static enum gdb_osabi | |
239 | m68kbsd_aout_osabi_sniffer (bfd *abfd) | |
240 | { | |
241 | if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0 | |
242 | || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0) | |
243 | return GDB_OSABI_NETBSD_AOUT; | |
244 | ||
245 | return GDB_OSABI_UNKNOWN; | |
246 | } | |
247 | ||
248 | static enum gdb_osabi | |
249 | m68kbsd_core_osabi_sniffer (bfd *abfd) | |
250 | { | |
251 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
252 | return GDB_OSABI_NETBSD_AOUT; | |
253 | ||
254 | return GDB_OSABI_UNKNOWN; | |
255 | } | |
256 | \f | |
257 | ||
258 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
259 | void _initialize_m68kbsd_tdep (void); | |
260 | ||
261 | void | |
262 | _initialize_m68kbsd_tdep (void) | |
263 | { | |
264 | gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour, | |
265 | m68kbsd_aout_osabi_sniffer); | |
266 | ||
267 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ | |
268 | gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour, | |
269 | m68kbsd_core_osabi_sniffer); | |
270 | ||
271 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT, | |
272 | m68kbsd_aout_init_abi); | |
273 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF, | |
274 | m68kbsd_elf_init_abi); | |
275 | } |