Really remove file.
[deliverable/binutils-gdb.git] / gdb / m68klinux-tdep.c
1 /* Motorola m68k target-dependent support for GNU/Linux.
2
3 Copyright 1996, 1998, 2000, 2001, 2002, 2003, 2004
4 Free Software Foundation, Inc.
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
22
23 #include "defs.h"
24 #include "gdbcore.h"
25 #include "doublest.h"
26 #include "floatformat.h"
27 #include "frame.h"
28 #include "target.h"
29 #include "gdb_string.h"
30 #include "gdbtypes.h"
31 #include "osabi.h"
32 #include "regcache.h"
33 #include "objfiles.h"
34 #include "symtab.h"
35 #include "m68k-tdep.h"
36 #include "trad-frame.h"
37 #include "frame-unwind.h"
38 \f
39 /* Offsets (in target ints) into jmp_buf. */
40
41 #define M68K_LINUX_JB_ELEMENT_SIZE 4
42 #define M68K_LINUX_JB_PC 7
43
44 /* Check whether insn1 and insn2 are parts of a signal trampoline. */
45
46 #define IS_SIGTRAMP(insn1, insn2) \
47 (/* addaw #20,sp; moveq #119,d0; trap #0 */ \
48 (insn1 == 0xdefc0014 && insn2 == 0x70774e40) \
49 /* moveq #119,d0; trap #0 */ \
50 || insn1 == 0x70774e40)
51
52 #define IS_RT_SIGTRAMP(insn1, insn2) \
53 (/* movel #173,d0; trap #0 */ \
54 (insn1 == 0x203c0000 && insn2 == 0x00ad4e40) \
55 /* moveq #82,d0; notb d0; trap #0 */ \
56 || (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40))
57
58 /* Return non-zero if PC points into the signal trampoline. For the
59 sake of m68k_linux_get_sigtramp_info we also distinguish between
60 non-RT and RT signal trampolines. */
61
62 static int
63 m68k_linux_pc_in_sigtramp (CORE_ADDR pc, char *name)
64 {
65 CORE_ADDR sp;
66 char buf[12];
67 unsigned long insn0, insn1, insn2;
68
69 if (read_memory_nobpt (pc - 4, buf, sizeof (buf)))
70 return 0;
71 insn1 = extract_unsigned_integer (buf + 4, 4);
72 insn2 = extract_unsigned_integer (buf + 8, 4);
73 if (IS_SIGTRAMP (insn1, insn2))
74 return 1;
75 if (IS_RT_SIGTRAMP (insn1, insn2))
76 return 2;
77
78 insn0 = extract_unsigned_integer (buf, 4);
79 if (IS_SIGTRAMP (insn0, insn1))
80 return 1;
81 if (IS_RT_SIGTRAMP (insn0, insn1))
82 return 2;
83
84 insn0 = ((insn0 << 16) & 0xffffffff) | (insn1 >> 16);
85 insn1 = ((insn1 << 16) & 0xffffffff) | (insn2 >> 16);
86 if (IS_SIGTRAMP (insn0, insn1))
87 return 1;
88 if (IS_RT_SIGTRAMP (insn0, insn1))
89 return 2;
90
91 return 0;
92 }
93
94 /* From <asm/sigcontext.h>. */
95 static int m68k_linux_sigcontext_reg_offset[M68K_NUM_REGS] =
96 {
97 2 * 4, /* %d0 */
98 3 * 4, /* %d1 */
99 -1, /* %d2 */
100 -1, /* %d3 */
101 -1, /* %d4 */
102 -1, /* %d5 */
103 -1, /* %d6 */
104 -1, /* %d7 */
105 4 * 4, /* %a0 */
106 5 * 4, /* %a1 */
107 -1, /* %a2 */
108 -1, /* %a3 */
109 -1, /* %a4 */
110 -1, /* %a5 */
111 -1, /* %fp */
112 1 * 4, /* %sp */
113 5 * 4 + 2, /* %sr */
114 6 * 4 + 2, /* %pc */
115 8 * 4, /* %fp0 */
116 11 * 4, /* %fp1 */
117 -1, /* %fp2 */
118 -1, /* %fp3 */
119 -1, /* %fp4 */
120 -1, /* %fp5 */
121 -1, /* %fp6 */
122 -1, /* %fp7 */
123 14 * 4, /* %fpcr */
124 15 * 4, /* %fpsr */
125 16 * 4 /* %fpiaddr */
126 };
127
128 /* From <asm/ucontext.h>. */
129 static int m68k_linux_ucontext_reg_offset[M68K_NUM_REGS] =
130 {
131 6 * 4, /* %d0 */
132 7 * 4, /* %d1 */
133 8 * 4, /* %d2 */
134 9 * 4, /* %d3 */
135 10 * 4, /* %d4 */
136 11 * 4, /* %d5 */
137 12 * 4, /* %d6 */
138 13 * 4, /* %d7 */
139 14 * 4, /* %a0 */
140 15 * 4, /* %a1 */
141 16 * 4, /* %a2 */
142 17 * 4, /* %a3 */
143 18 * 4, /* %a4 */
144 19 * 4, /* %a5 */
145 20 * 4, /* %fp */
146 21 * 4, /* %sp */
147 23 * 4, /* %sr */
148 22 * 4, /* %pc */
149 27 * 4, /* %fp0 */
150 30 * 4, /* %fp1 */
151 33 * 4, /* %fp2 */
152 36 * 4, /* %fp3 */
153 39 * 4, /* %fp4 */
154 42 * 4, /* %fp5 */
155 45 * 4, /* %fp6 */
156 48 * 4, /* %fp7 */
157 24 * 4, /* %fpcr */
158 25 * 4, /* %fpsr */
159 26 * 4 /* %fpiaddr */
160 };
161
162
163 /* Get info about saved registers in sigtramp. */
164
165 struct m68k_linux_sigtramp_info
166 {
167 /* Address of sigcontext. */
168 CORE_ADDR sigcontext_addr;
169
170 /* Offset of registers in `struct sigcontext'. */
171 int *sc_reg_offset;
172 };
173
174 static struct m68k_linux_sigtramp_info
175 m68k_linux_get_sigtramp_info (struct frame_info *next_frame)
176 {
177 CORE_ADDR sp;
178 char buf[4];
179 struct m68k_linux_sigtramp_info info;
180
181 frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
182 sp = extract_unsigned_integer (buf, 4);
183
184 /* Get sigcontext address, it is the third parameter on the stack. */
185 info.sigcontext_addr = read_memory_unsigned_integer (sp + 8, 4);
186
187 if (m68k_linux_pc_in_sigtramp (frame_pc_unwind (next_frame), 0) == 2)
188 info.sc_reg_offset = m68k_linux_ucontext_reg_offset;
189 else
190 info.sc_reg_offset = m68k_linux_sigcontext_reg_offset;
191 return info;
192 }
193
194 /* Signal trampolines. */
195
196 static struct trad_frame_cache *
197 m68k_linux_sigtramp_frame_cache (struct frame_info *next_frame,
198 void **this_cache)
199 {
200 struct frame_id this_id;
201 struct trad_frame_cache *cache;
202 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
203 struct m68k_linux_sigtramp_info info;
204 char buf[4];
205 int i;
206
207 if (*this_cache)
208 return *this_cache;
209
210 cache = trad_frame_cache_zalloc (next_frame);
211
212 /* FIXME: cagney/2004-05-01: This is is long standing broken code.
213 The frame ID's code address should be the start-address of the
214 signal trampoline and not the current PC within that
215 trampoline. */
216 frame_unwind_register (next_frame, M68K_SP_REGNUM, buf);
217 /* See the end of m68k_push_dummy_call. */
218 this_id = frame_id_build (extract_unsigned_integer (buf, 4) - 4 + 8,
219 frame_pc_unwind (next_frame));
220 trad_frame_set_id (cache, this_id);
221
222 info = m68k_linux_get_sigtramp_info (next_frame);
223
224 for (i = 0; i < M68K_NUM_REGS; i++)
225 if (info.sc_reg_offset[i] != -1)
226 trad_frame_set_reg_addr (cache, i,
227 info.sigcontext_addr + info.sc_reg_offset[i]);
228
229 *this_cache = cache;
230 return cache;
231 }
232
233 static void
234 m68k_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
235 void **this_cache,
236 struct frame_id *this_id)
237 {
238 struct trad_frame_cache *cache =
239 m68k_linux_sigtramp_frame_cache (next_frame, this_cache);
240 trad_frame_get_id (cache, this_id);
241 }
242
243 static void
244 m68k_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
245 void **this_cache,
246 int regnum, int *optimizedp,
247 enum lval_type *lvalp,
248 CORE_ADDR *addrp,
249 int *realnump, void *valuep)
250 {
251 /* Make sure we've initialized the cache. */
252 struct trad_frame_cache *cache =
253 m68k_linux_sigtramp_frame_cache (next_frame, this_cache);
254 trad_frame_get_register (cache, next_frame, regnum, optimizedp, lvalp,
255 addrp, realnump, valuep);
256 }
257
258 static const struct frame_unwind m68k_linux_sigtramp_frame_unwind =
259 {
260 SIGTRAMP_FRAME,
261 m68k_linux_sigtramp_frame_this_id,
262 m68k_linux_sigtramp_frame_prev_register
263 };
264
265 static const struct frame_unwind *
266 m68k_linux_sigtramp_frame_sniffer (struct frame_info *next_frame)
267 {
268 CORE_ADDR pc = frame_pc_unwind (next_frame);
269 char *name;
270
271 find_pc_partial_function (pc, &name, NULL, NULL);
272 if (m68k_linux_pc_in_sigtramp (pc, name))
273 return &m68k_linux_sigtramp_frame_unwind;
274
275 return NULL;
276 }
277
278 static void
279 m68k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
280 {
281 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
282
283 tdep->jb_pc = M68K_LINUX_JB_PC;
284 tdep->jb_elt_size = M68K_LINUX_JB_ELEMENT_SIZE;
285
286 /* GNU/Linux uses a calling convention that's similar to SVR4. It
287 returns integer values in %d0/%di, pointer values in %a0 and
288 floating values in %fp0, just like SVR4, but uses %a1 to pass the
289 address to store a structure value. It also returns small
290 structures in registers instead of memory. */
291 m68k_svr4_init_abi (info, gdbarch);
292 tdep->struct_value_regnum = M68K_A1_REGNUM;
293 tdep->struct_return = reg_struct_return;
294
295 frame_unwind_append_sniffer (gdbarch, m68k_linux_sigtramp_frame_sniffer);
296
297 /* Shared library handling. */
298 set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
299 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
300 }
301
302 void
303 _initialize_m68k_linux_tdep (void)
304 {
305 gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_LINUX,
306 m68k_linux_init_abi);
307 }
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