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1 | /* Target-dependent code for Motorola 68000 BSD's. |
2 | ||
6aba47ca | 3 | Copyright (C) 2004, 2005, 2007 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" | |
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28 | |
29 | #include "gdb_assert.h" | |
30 | #include "gdb_string.h" | |
31 | ||
32 | #include "m68k-tdep.h" | |
33 | #include "solib-svr4.h" | |
34 | ||
35 | /* Core file support. */ | |
36 | ||
37 | /* Sizeof `struct reg' in <machine/reg.h>. */ | |
38 | #define M68KBSD_SIZEOF_GREGS (18 * 4) | |
39 | ||
40 | /* Sizeof `struct fpreg' in <machine/reg.h. */ | |
41 | #define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4) | |
42 | ||
43 | int | |
44 | m68kbsd_fpreg_offset (int regnum) | |
45 | { | |
8ed86d01 VP |
46 | int fp_len = TYPE_LENGTH (gdbarch_register_type (current_gdbarch, regnum)); |
47 | ||
8f2d3ea0 | 48 | if (regnum >= M68K_FPC_REGNUM) |
8ed86d01 | 49 | return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4; |
8f2d3ea0 | 50 | |
8ed86d01 | 51 | return (regnum - M68K_FP0_REGNUM) * fp_len; |
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52 | } |
53 | ||
54 | /* Supply register REGNUM from the buffer specified by FPREGS and LEN | |
55 | in the floating-point register set REGSET to register cache | |
56 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
57 | ||
58 | static void | |
59 | m68kbsd_supply_fpregset (const struct regset *regset, | |
60 | struct regcache *regcache, | |
61 | int regnum, const void *fpregs, size_t len) | |
62 | { | |
f5cf7aa1 | 63 | const gdb_byte *regs = fpregs; |
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64 | int i; |
65 | ||
66 | gdb_assert (len >= M68KBSD_SIZEOF_FPREGS); | |
67 | ||
68 | for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
69 | { | |
70 | if (regnum == i || regnum == -1) | |
71 | regcache_raw_supply (regcache, i, regs + m68kbsd_fpreg_offset (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 | { | |
f5cf7aa1 | 84 | const gdb_byte *regs = gregs; |
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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 struct regset m68kbsd_gregset = | |
106 | { | |
107 | NULL, | |
108 | m68kbsd_supply_gregset | |
109 | }; | |
110 | ||
111 | static struct regset m68kbsd_fpregset = | |
112 | { | |
113 | NULL, | |
114 | m68kbsd_supply_fpregset | |
115 | }; | |
116 | ||
117 | /* Return the appropriate register set for the core section identified | |
118 | by SECT_NAME and SECT_SIZE. */ | |
119 | ||
120 | static const struct regset * | |
121 | m68kbsd_regset_from_core_section (struct gdbarch *gdbarch, | |
122 | const char *sect_name, size_t sect_size) | |
123 | { | |
124 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= M68KBSD_SIZEOF_GREGS) | |
125 | return &m68kbsd_gregset; | |
126 | ||
127 | if (strcmp (sect_name, ".reg2") == 0 && sect_size >= M68KBSD_SIZEOF_FPREGS) | |
128 | return &m68kbsd_fpregset; | |
129 | ||
130 | return NULL; | |
131 | } | |
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132 | \f |
133 | ||
134 | /* Signal trampolines. */ | |
135 | ||
136 | static void | |
137 | m68kobsd_sigtramp_cache_init (const struct tramp_frame *self, | |
138 | struct frame_info *next_frame, | |
139 | struct trad_frame_cache *this_cache, | |
140 | CORE_ADDR func) | |
141 | { | |
142 | CORE_ADDR addr, base, pc; | |
143 | int regnum; | |
144 | ||
145 | base = frame_unwind_register_unsigned (next_frame, M68K_SP_REGNUM); | |
146 | ||
147 | /* The 'addql #4,%sp' instruction at offset 8 adjusts the stack | |
148 | pointer. Adjust the frame base accordingly. */ | |
149 | pc = frame_unwind_register_unsigned (next_frame, M68K_PC_REGNUM); | |
150 | if ((pc - func) > 8) | |
151 | base -= 4; | |
152 | ||
153 | /* Get frame pointer, stack pointer, program counter and processor | |
154 | state from `struct sigcontext'. */ | |
155 | addr = get_frame_memory_unsigned (next_frame, base + 8, 4); | |
156 | trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8); | |
157 | trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12); | |
158 | trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20); | |
159 | trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24); | |
160 | ||
161 | /* The sc_ap member of `struct sigcontext' points to additional | |
162 | hardware state. Here we find the missing registers. */ | |
163 | addr = get_frame_memory_unsigned (next_frame, addr + 16, 4) + 4; | |
164 | for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4) | |
165 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
166 | ||
167 | /* Construct the frame ID using the function start. */ | |
168 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
169 | } | |
170 | ||
171 | static const struct tramp_frame m68kobsd_sigtramp = { | |
172 | SIGTRAMP_FRAME, | |
173 | 2, | |
174 | { | |
175 | { 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */ | |
176 | { 0x4e90, -1 }, /* jsr %a0@ */ | |
177 | { 0x588f, -1 }, /* addql #4,%sp */ | |
178 | { 0x4e41, -1 }, /* trap #1 */ | |
179 | { 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */ | |
180 | { 0x7001, -1 }, /* moveq #SYS_exit,%d0 */ | |
181 | { 0x4e40, -1 }, /* trap #0 */ | |
182 | { TRAMP_SENTINEL_INSN, -1 } | |
183 | }, | |
184 | m68kobsd_sigtramp_cache_init | |
185 | }; | |
186 | \f | |
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187 | |
188 | static void | |
189 | m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
190 | { | |
191 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
192 | ||
193 | tdep->jb_pc = 5; | |
194 | tdep->jb_elt_size = 4; | |
195 | ||
9418f048 UW |
196 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
197 | ||
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198 | set_gdbarch_regset_from_core_section |
199 | (gdbarch, m68kbsd_regset_from_core_section); | |
200 | } | |
201 | ||
202 | /* OpenBSD and NetBSD a.out. */ | |
203 | ||
204 | static void | |
205 | m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
206 | { | |
207 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
208 | ||
209 | m68kbsd_init_abi (info, gdbarch); | |
210 | ||
211 | tdep->struct_return = reg_struct_return; | |
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212 | |
213 | tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp); | |
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214 | } |
215 | ||
216 | /* NetBSD ELF. */ | |
217 | ||
218 | static void | |
219 | m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
220 | { | |
221 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
222 | ||
223 | m68kbsd_init_abi (info, gdbarch); | |
224 | ||
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225 | /* NetBSD ELF uses the SVR4 ABI. */ |
226 | m68k_svr4_init_abi (info, gdbarch); | |
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227 | tdep->struct_return = pcc_struct_return; |
228 | ||
229 | /* NetBSD ELF uses SVR4-style shared libraries. */ | |
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230 | set_solib_svr4_fetch_link_map_offsets |
231 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
232 | } | |
233 | \f | |
234 | ||
235 | static enum gdb_osabi | |
236 | m68kbsd_aout_osabi_sniffer (bfd *abfd) | |
237 | { | |
238 | if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0 | |
239 | || strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0) | |
240 | return GDB_OSABI_NETBSD_AOUT; | |
241 | ||
242 | return GDB_OSABI_UNKNOWN; | |
243 | } | |
244 | ||
245 | static enum gdb_osabi | |
246 | m68kbsd_core_osabi_sniffer (bfd *abfd) | |
247 | { | |
248 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
249 | return GDB_OSABI_NETBSD_AOUT; | |
250 | ||
251 | return GDB_OSABI_UNKNOWN; | |
252 | } | |
253 | \f | |
254 | ||
255 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
256 | void _initialize_m68kbsd_tdep (void); | |
257 | ||
258 | void | |
259 | _initialize_m68kbsd_tdep (void) | |
260 | { | |
261 | gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour, | |
262 | m68kbsd_aout_osabi_sniffer); | |
263 | ||
264 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ | |
265 | gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour, | |
266 | m68kbsd_core_osabi_sniffer); | |
267 | ||
268 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT, | |
269 | m68kbsd_aout_init_abi); | |
270 | gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF, | |
271 | m68kbsd_elf_init_abi); | |
272 | } |