Commit | Line | Data |
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748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b AC |
2 | |
3 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, | |
4 | 2001, 2002, 2003, 2004 Free Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
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. | |
c906108c | 12 | |
c5aa993b JM |
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. | |
c906108c | 17 | |
c5aa993b JM |
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. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
3f244638 | 24 | #include "dwarf2-frame.h" |
c906108c | 25 | #include "frame.h" |
8de307e0 AS |
26 | #include "frame-base.h" |
27 | #include "frame-unwind.h" | |
c906108c SS |
28 | #include "symtab.h" |
29 | #include "gdbcore.h" | |
30 | #include "value.h" | |
31 | #include "gdb_string.h" | |
8de307e0 | 32 | #include "gdb_assert.h" |
7a292a7a | 33 | #include "inferior.h" |
4e052eda | 34 | #include "regcache.h" |
5d3ed2e3 | 35 | #include "arch-utils.h" |
55809acb | 36 | #include "osabi.h" |
a89aa300 | 37 | #include "dis-asm.h" |
32eeb91a AS |
38 | |
39 | #include "m68k-tdep.h" | |
c906108c | 40 | \f |
c5aa993b | 41 | |
89c3b6d3 PDM |
42 | #define P_LINKL_FP 0x480e |
43 | #define P_LINKW_FP 0x4e56 | |
44 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
45 | #define P_MOVEAL_SP_FP 0x2c4f |
46 | #define P_ADDAW_SP 0xdefc | |
47 | #define P_ADDAL_SP 0xdffc | |
48 | #define P_SUBQW_SP 0x514f | |
49 | #define P_SUBQL_SP 0x518f | |
50 | #define P_LEA_SP_SP 0x4fef | |
51 | #define P_LEA_PC_A5 0x4bfb0170 | |
52 | #define P_FMOVEMX_SP 0xf227 | |
53 | #define P_MOVEL_SP 0x2f00 | |
54 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 55 | |
103a1597 | 56 | |
103a1597 GS |
57 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
58 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
59 | ||
103a1597 | 60 | /* Offset from SP to first arg on stack at first instruction of a function */ |
103a1597 GS |
61 | #define SP_ARG0 (1 * 4) |
62 | ||
103a1597 GS |
63 | #if !defined (BPT_VECTOR) |
64 | #define BPT_VECTOR 0xf | |
65 | #endif | |
66 | ||
eb2e12d7 | 67 | static const unsigned char * |
103a1597 GS |
68 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
69 | { | |
70 | static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; | |
71 | *lenptr = sizeof (break_insn); | |
72 | return break_insn; | |
73 | } | |
74 | ||
75 | ||
942dc0e9 | 76 | static int |
5ae5f592 | 77 | m68k_register_bytes_ok (long numbytes) |
942dc0e9 GS |
78 | { |
79 | return ((numbytes == REGISTER_BYTES_FP) | |
80 | || (numbytes == REGISTER_BYTES_NOFP)); | |
81 | } | |
82 | ||
d85fe7f7 AS |
83 | /* Return the GDB type object for the "standard" data type of data in |
84 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
85 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
86 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
87 | addresses return pointer to void, not pointer to char, because we | |
88 | don't want to attempt to print the string after printing the | |
89 | address. */ | |
5d3ed2e3 GS |
90 | |
91 | static struct type * | |
8de307e0 | 92 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 93 | { |
03dac896 AS |
94 | if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
95 | return builtin_type_m68881_ext; | |
96 | ||
32eeb91a | 97 | if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
03dac896 AS |
98 | return builtin_type_void_func_ptr; |
99 | ||
32eeb91a AS |
100 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
101 | || regnum == PS_REGNUM) | |
03dac896 AS |
102 | return builtin_type_int32; |
103 | ||
32eeb91a | 104 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
105 | return builtin_type_void_data_ptr; |
106 | ||
107 | return builtin_type_int32; | |
5d3ed2e3 GS |
108 | } |
109 | ||
110 | /* Function: m68k_register_name | |
111 | Returns the name of the standard m68k register regnum. */ | |
112 | ||
113 | static const char * | |
114 | m68k_register_name (int regnum) | |
115 | { | |
116 | static char *register_names[] = { | |
117 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
118 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
119 | "ps", "pc", | |
120 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
121 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" | |
122 | }; | |
123 | ||
124 | if (regnum < 0 || | |
125 | regnum >= sizeof (register_names) / sizeof (register_names[0])) | |
126 | internal_error (__FILE__, __LINE__, | |
127 | "m68k_register_name: illegal register number %d", regnum); | |
128 | else | |
129 | return register_names[regnum]; | |
130 | } | |
8de307e0 AS |
131 | \f |
132 | /* Extract from an array REGBUF containing the (raw) register state, a | |
133 | function return value of TYPE, and copy that, in virtual format, | |
134 | into VALBUF. */ | |
942dc0e9 GS |
135 | |
136 | static void | |
8de307e0 AS |
137 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
138 | void *valbuf) | |
942dc0e9 | 139 | { |
8de307e0 AS |
140 | int len = TYPE_LENGTH (type); |
141 | char buf[M68K_MAX_REGISTER_SIZE]; | |
942dc0e9 | 142 | |
8de307e0 AS |
143 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
144 | && TYPE_NFIELDS (type) == 1) | |
145 | { | |
146 | m68k_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); | |
147 | return; | |
148 | } | |
942dc0e9 | 149 | |
8de307e0 AS |
150 | if (len <= 4) |
151 | { | |
152 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
153 | memcpy (valbuf, buf + (4 - len), len); | |
154 | } | |
155 | else if (len <= 8) | |
156 | { | |
157 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
158 | memcpy (valbuf, buf + (8 - len), len - 4); | |
159 | regcache_raw_read (regcache, M68K_D1_REGNUM, | |
160 | (char *) valbuf + (len - 4)); | |
161 | } | |
162 | else | |
163 | internal_error (__FILE__, __LINE__, | |
164 | "Cannot extract return value of %d bytes long.", len); | |
942dc0e9 GS |
165 | } |
166 | ||
8de307e0 AS |
167 | /* Write into the appropriate registers a function return value stored |
168 | in VALBUF of type TYPE, given in virtual format. */ | |
942dc0e9 GS |
169 | |
170 | static void | |
8de307e0 AS |
171 | m68k_store_return_value (struct type *type, struct regcache *regcache, |
172 | const void *valbuf) | |
942dc0e9 | 173 | { |
8de307e0 | 174 | int len = TYPE_LENGTH (type); |
942dc0e9 | 175 | |
8de307e0 AS |
176 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
177 | && TYPE_NFIELDS (type) == 1) | |
178 | { | |
179 | m68k_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); | |
180 | return; | |
181 | } | |
942dc0e9 | 182 | |
8de307e0 AS |
183 | if (len <= 4) |
184 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
185 | else if (len <= 8) | |
186 | { | |
187 | regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len, | |
188 | len - 4, valbuf); | |
189 | regcache_raw_write (regcache, M68K_D0_REGNUM, | |
190 | (char *) valbuf + (len - 4)); | |
191 | } | |
192 | else | |
193 | internal_error (__FILE__, __LINE__, | |
194 | "Cannot store return value of %d bytes long.", len); | |
195 | } | |
942dc0e9 | 196 | |
8de307e0 AS |
197 | /* Extract from REGCACHE, which contains the (raw) register state, the |
198 | address in which a function should return its structure value, as a | |
199 | CORE_ADDR. */ | |
942dc0e9 GS |
200 | |
201 | static CORE_ADDR | |
8de307e0 | 202 | m68k_extract_struct_value_address (struct regcache *regcache) |
942dc0e9 | 203 | { |
8de307e0 AS |
204 | char buf[4]; |
205 | ||
206 | regcache_cooked_read (regcache, M68K_D0_REGNUM, buf); | |
207 | return extract_unsigned_integer (buf, 4); | |
942dc0e9 GS |
208 | } |
209 | ||
c481dac7 AS |
210 | static int |
211 | m68k_use_struct_convention (int gcc_p, struct type *type) | |
212 | { | |
213 | enum struct_return struct_return; | |
214 | ||
215 | struct_return = gdbarch_tdep (current_gdbarch)->struct_return; | |
216 | return generic_use_struct_convention (struct_return == reg_struct_return, | |
217 | type); | |
218 | } | |
219 | ||
942dc0e9 GS |
220 | /* A function that tells us whether the function invocation represented |
221 | by fi does not have a frame on the stack associated with it. If it | |
222 | does not, FRAMELESS is set to 1, else 0. */ | |
223 | ||
224 | static int | |
225 | m68k_frameless_function_invocation (struct frame_info *fi) | |
226 | { | |
32eeb91a | 227 | if (get_frame_type (fi) == SIGTRAMP_FRAME) |
942dc0e9 GS |
228 | return 0; |
229 | else | |
19772a2c | 230 | return legacy_frameless_look_for_prologue (fi); |
942dc0e9 GS |
231 | } |
232 | ||
89c3b6d3 | 233 | int |
fba45db2 | 234 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 235 | { |
1bd54964 AC |
236 | if (name != NULL) |
237 | return strcmp (name, "_sigcode") == 0; | |
238 | else | |
239 | return 0; | |
89c3b6d3 PDM |
240 | } |
241 | ||
242 | CORE_ADDR | |
fba45db2 | 243 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
244 | { |
245 | /* we assume here that the only frameless functions are the system calls | |
246 | or other functions who do not put anything on the stack. */ | |
32eeb91a | 247 | if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
1e2330ba | 248 | return get_frame_base (frame_info) + 12; |
19772a2c | 249 | else if (legacy_frameless_look_for_prologue (frame_info)) |
89c3b6d3 | 250 | { |
b5d78d39 | 251 | /* Check for an interrupted system call */ |
11c02a10 AC |
252 | if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME)) |
253 | return get_frame_base (get_next_frame (frame_info)) + 16; | |
b5d78d39 | 254 | else |
1e2330ba | 255 | return get_frame_base (frame_info) + 4; |
89c3b6d3 PDM |
256 | } |
257 | else | |
1e2330ba | 258 | return get_frame_base (frame_info); |
89c3b6d3 PDM |
259 | } |
260 | ||
261 | CORE_ADDR | |
fba45db2 | 262 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 | 263 | { |
b5fc49aa AS |
264 | return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
265 | + 4, 4); | |
89c3b6d3 PDM |
266 | } |
267 | ||
392a587b | 268 | int |
fba45db2 | 269 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
270 | { |
271 | int val; | |
8bedc050 | 272 | CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi); |
b5fc49aa | 273 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 274 | val = 0; |
c5aa993b | 275 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 276 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
277 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
278 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
279 | { |
280 | val = (insn >> 9) & 7; | |
281 | if (val == 0) | |
282 | val = 8; | |
283 | } | |
c5aa993b | 284 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
285 | val = read_memory_integer (pc + 2, 4); |
286 | val >>= 2; | |
287 | return val; | |
288 | } | |
289 | ||
8de307e0 AS |
290 | static CORE_ADDR |
291 | m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, | |
292 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, | |
293 | struct value **args, CORE_ADDR sp, int struct_return, | |
294 | CORE_ADDR struct_addr) | |
7f8e7424 | 295 | { |
8de307e0 AS |
296 | char buf[4]; |
297 | int i; | |
298 | ||
299 | /* Push arguments in reverse order. */ | |
300 | for (i = nargs - 1; i >= 0; i--) | |
301 | { | |
c481dac7 AS |
302 | struct type *value_type = VALUE_ENCLOSING_TYPE (args[i]); |
303 | int len = TYPE_LENGTH (value_type); | |
8de307e0 | 304 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
305 | int offset; |
306 | ||
307 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
308 | right aligned. */ | |
309 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
310 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
311 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
312 | && len > 4) | |
313 | offset = 0; | |
314 | else | |
315 | offset = container_len - len; | |
8de307e0 AS |
316 | sp -= container_len; |
317 | write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len); | |
318 | } | |
319 | ||
c481dac7 | 320 | /* Store struct value address. */ |
8de307e0 AS |
321 | if (struct_return) |
322 | { | |
8de307e0 | 323 | store_unsigned_integer (buf, 4, struct_addr); |
c481dac7 | 324 | regcache_cooked_write (regcache, M68K_A1_REGNUM, buf); |
8de307e0 AS |
325 | } |
326 | ||
327 | /* Store return address. */ | |
328 | sp -= 4; | |
329 | store_unsigned_integer (buf, 4, bp_addr); | |
330 | write_memory (sp, buf, 4); | |
331 | ||
332 | /* Finally, update the stack pointer... */ | |
333 | store_unsigned_integer (buf, 4, sp); | |
334 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
335 | ||
336 | /* ...and fake a frame pointer. */ | |
337 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
338 | ||
339 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
340 | frame's CFA. */ | |
341 | return sp + 8; | |
7f8e7424 | 342 | } |
8de307e0 AS |
343 | \f |
344 | struct m68k_frame_cache | |
345 | { | |
346 | /* Base address. */ | |
347 | CORE_ADDR base; | |
348 | CORE_ADDR sp_offset; | |
349 | CORE_ADDR pc; | |
7f8e7424 | 350 | |
8de307e0 AS |
351 | /* Saved registers. */ |
352 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
353 | CORE_ADDR saved_sp; | |
7f8e7424 | 354 | |
8de307e0 AS |
355 | /* Stack space reserved for local variables. */ |
356 | long locals; | |
357 | }; | |
c906108c | 358 | |
8de307e0 AS |
359 | /* Allocate and initialize a frame cache. */ |
360 | ||
361 | static struct m68k_frame_cache * | |
362 | m68k_alloc_frame_cache (void) | |
c906108c | 363 | { |
8de307e0 AS |
364 | struct m68k_frame_cache *cache; |
365 | int i; | |
c906108c | 366 | |
8de307e0 | 367 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 368 | |
8de307e0 AS |
369 | /* Base address. */ |
370 | cache->base = 0; | |
371 | cache->sp_offset = -4; | |
372 | cache->pc = 0; | |
c906108c | 373 | |
8de307e0 AS |
374 | /* Saved registers. We initialize these to -1 since zero is a valid |
375 | offset (that's where %fp is supposed to be stored). */ | |
376 | for (i = 0; i < M68K_NUM_REGS; i++) | |
377 | cache->saved_regs[i] = -1; | |
378 | ||
379 | /* Frameless until proven otherwise. */ | |
380 | cache->locals = -1; | |
381 | ||
382 | return cache; | |
c906108c SS |
383 | } |
384 | ||
8de307e0 AS |
385 | /* Check whether PC points at a code that sets up a new stack frame. |
386 | If so, it updates CACHE and returns the address of the first | |
387 | instruction after the sequence that sets removes the "hidden" | |
388 | argument from the stack or CURRENT_PC, whichever is smaller. | |
389 | Otherwise, return PC. */ | |
c906108c | 390 | |
8de307e0 AS |
391 | static CORE_ADDR |
392 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
393 | struct m68k_frame_cache *cache) | |
c906108c | 394 | { |
8de307e0 AS |
395 | int op; |
396 | ||
397 | if (pc >= current_pc) | |
398 | return current_pc; | |
c906108c | 399 | |
8de307e0 AS |
400 | op = read_memory_unsigned_integer (pc, 2); |
401 | ||
402 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 403 | { |
8de307e0 AS |
404 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
405 | cache->sp_offset += 4; | |
406 | if (op == P_LINKW_FP) | |
407 | { | |
408 | /* link.w %fp, #-N */ | |
409 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
410 | cache->locals = -read_memory_integer (pc + 2, 2); | |
411 | ||
412 | if (pc + 4 < current_pc && cache->locals == 0) | |
413 | { | |
414 | op = read_memory_unsigned_integer (pc + 4, 2); | |
415 | if (op == P_ADDAL_SP) | |
416 | { | |
417 | cache->locals = read_memory_integer (pc + 6, 4); | |
418 | return pc + 10; | |
419 | } | |
420 | } | |
421 | ||
422 | return pc + 4; | |
423 | } | |
424 | else if (op == P_LINKL_FP) | |
c906108c | 425 | { |
8de307e0 AS |
426 | /* link.l %fp, #-N */ |
427 | cache->locals = -read_memory_integer (pc + 2, 4); | |
428 | return pc + 6; | |
429 | } | |
430 | else | |
431 | { | |
432 | /* pea (%fp); movea.l %sp, %fp */ | |
433 | cache->locals = 0; | |
434 | ||
435 | if (pc + 2 < current_pc) | |
436 | { | |
437 | op = read_memory_unsigned_integer (pc + 2, 2); | |
438 | ||
439 | if (op == P_MOVEAL_SP_FP) | |
440 | { | |
441 | /* move.l %sp, %fp */ | |
442 | return pc + 4; | |
443 | } | |
444 | } | |
445 | ||
446 | return pc + 2; | |
c906108c SS |
447 | } |
448 | } | |
8de307e0 | 449 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 450 | { |
8de307e0 AS |
451 | /* subq.[wl] #N,%sp */ |
452 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
453 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
454 | if (pc + 2 < current_pc) | |
c906108c | 455 | { |
8de307e0 AS |
456 | op = read_memory_unsigned_integer (pc + 2, 2); |
457 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
458 | { | |
459 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
460 | return pc + 4; | |
461 | } | |
c906108c | 462 | } |
8de307e0 AS |
463 | return pc + 2; |
464 | } | |
465 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
466 | { | |
467 | /* adda.w #-N,%sp */ | |
468 | /* lea (-N,%sp),%sp */ | |
469 | cache->locals = -read_memory_integer (pc + 2, 2); | |
470 | return pc + 4; | |
c906108c | 471 | } |
8de307e0 | 472 | else if (op == P_ADDAL_SP) |
c906108c | 473 | { |
8de307e0 AS |
474 | /* adda.l #-N,%sp */ |
475 | cache->locals = -read_memory_integer (pc + 2, 4); | |
476 | return pc + 6; | |
c906108c | 477 | } |
8de307e0 AS |
478 | |
479 | return pc; | |
c906108c | 480 | } |
c5aa993b | 481 | |
8de307e0 AS |
482 | /* Check whether PC points at code that saves registers on the stack. |
483 | If so, it updates CACHE and returns the address of the first | |
484 | instruction after the register saves or CURRENT_PC, whichever is | |
485 | smaller. Otherwise, return PC. */ | |
c906108c | 486 | |
8de307e0 AS |
487 | static CORE_ADDR |
488 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
489 | struct m68k_frame_cache *cache) | |
490 | { | |
491 | if (cache->locals >= 0) | |
492 | { | |
493 | CORE_ADDR offset; | |
494 | int op; | |
495 | int i, mask, regno; | |
c906108c | 496 | |
8de307e0 AS |
497 | offset = -4 - cache->locals; |
498 | while (pc < current_pc) | |
499 | { | |
500 | op = read_memory_unsigned_integer (pc, 2); | |
501 | if (op == P_FMOVEMX_SP) | |
502 | { | |
503 | /* fmovem.x REGS,-(%sp) */ | |
504 | op = read_memory_unsigned_integer (pc + 2, 2); | |
505 | if ((op & 0xff00) == 0xe000) | |
506 | { | |
507 | mask = op & 0xff; | |
508 | for (i = 0; i < 16; i++, mask >>= 1) | |
509 | { | |
510 | if (mask & 1) | |
511 | { | |
512 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
513 | offset -= 12; | |
514 | } | |
515 | } | |
516 | pc += 4; | |
517 | } | |
518 | else | |
519 | break; | |
520 | } | |
521 | else if ((op & 0170677) == P_MOVEL_SP) | |
522 | { | |
523 | /* move.l %R,-(%sp) */ | |
524 | regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); | |
525 | cache->saved_regs[regno] = offset; | |
526 | offset -= 4; | |
527 | pc += 2; | |
528 | } | |
529 | else if (op == P_MOVEML_SP) | |
530 | { | |
531 | /* movem.l REGS,-(%sp) */ | |
532 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
533 | for (i = 0; i < 16; i++, mask >>= 1) | |
534 | { | |
535 | if (mask & 1) | |
536 | { | |
537 | cache->saved_regs[15 - i] = offset; | |
538 | offset -= 4; | |
539 | } | |
540 | } | |
541 | pc += 4; | |
542 | } | |
543 | else | |
544 | break; | |
545 | } | |
546 | } | |
547 | ||
548 | return pc; | |
549 | } | |
c906108c | 550 | |
c906108c | 551 | |
8de307e0 AS |
552 | /* Do a full analysis of the prologue at PC and update CACHE |
553 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
554 | address where the analysis stopped. | |
c906108c | 555 | |
8de307e0 | 556 | We handle all cases that can be generated by gcc. |
c906108c | 557 | |
8de307e0 | 558 | For allocating a stack frame: |
c906108c | 559 | |
8de307e0 AS |
560 | link.w %a6,#-N |
561 | link.l %a6,#-N | |
562 | pea (%fp); move.l %sp,%fp | |
563 | link.w %a6,#0; add.l #-N,%sp | |
564 | subq.l #N,%sp | |
565 | subq.w #N,%sp | |
566 | subq.w #8,%sp; subq.w #N-8,%sp | |
567 | add.w #-N,%sp | |
568 | lea (-N,%sp),%sp | |
569 | add.l #-N,%sp | |
c906108c | 570 | |
8de307e0 | 571 | For saving registers: |
c906108c | 572 | |
8de307e0 AS |
573 | fmovem.x REGS,-(%sp) |
574 | move.l R1,-(%sp) | |
575 | move.l R1,-(%sp); move.l R2,-(%sp) | |
576 | movem.l REGS,-(%sp) | |
c906108c | 577 | |
8de307e0 | 578 | For setting up the PIC register: |
c906108c | 579 | |
8de307e0 | 580 | lea (%pc,N),%a5 |
c906108c | 581 | |
8de307e0 | 582 | */ |
c906108c | 583 | |
eb2e12d7 | 584 | static CORE_ADDR |
8de307e0 AS |
585 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
586 | struct m68k_frame_cache *cache) | |
c906108c | 587 | { |
8de307e0 | 588 | unsigned int op; |
c906108c | 589 | |
8de307e0 AS |
590 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
591 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
592 | if (pc >= current_pc) | |
593 | return current_pc; | |
c906108c | 594 | |
8de307e0 AS |
595 | /* Check for GOT setup. */ |
596 | op = read_memory_unsigned_integer (pc, 4); | |
597 | if (op == P_LEA_PC_A5) | |
c906108c | 598 | { |
8de307e0 AS |
599 | /* lea (%pc,N),%a5 */ |
600 | return pc + 6; | |
c906108c | 601 | } |
8de307e0 AS |
602 | |
603 | return pc; | |
c906108c SS |
604 | } |
605 | ||
8de307e0 | 606 | /* Return PC of first real instruction. */ |
7f8e7424 | 607 | |
8de307e0 AS |
608 | static CORE_ADDR |
609 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 610 | { |
8de307e0 AS |
611 | struct m68k_frame_cache cache; |
612 | CORE_ADDR pc; | |
613 | int op; | |
c906108c | 614 | |
8de307e0 AS |
615 | cache.locals = -1; |
616 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
617 | if (cache.locals < 0) | |
618 | return start_pc; | |
619 | return pc; | |
620 | } | |
c906108c | 621 | |
8de307e0 AS |
622 | static CORE_ADDR |
623 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
624 | { | |
625 | char buf[8]; | |
7f8e7424 | 626 | |
8de307e0 AS |
627 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
628 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
629 | } | |
630 | \f | |
631 | /* Normal frames. */ | |
7f8e7424 | 632 | |
8de307e0 AS |
633 | static struct m68k_frame_cache * |
634 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
635 | { | |
636 | struct m68k_frame_cache *cache; | |
637 | char buf[4]; | |
638 | int i; | |
639 | ||
640 | if (*this_cache) | |
641 | return *this_cache; | |
642 | ||
643 | cache = m68k_alloc_frame_cache (); | |
644 | *this_cache = cache; | |
645 | ||
646 | /* In principle, for normal frames, %fp holds the frame pointer, | |
647 | which holds the base address for the current stack frame. | |
648 | However, for functions that don't need it, the frame pointer is | |
649 | optional. For these "frameless" functions the frame pointer is | |
650 | actually the frame pointer of the calling frame. Signal | |
651 | trampolines are just a special case of a "frameless" function. | |
652 | They (usually) share their frame pointer with the frame that was | |
653 | in progress when the signal occurred. */ | |
654 | ||
655 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
656 | cache->base = extract_unsigned_integer (buf, 4); | |
657 | if (cache->base == 0) | |
658 | return cache; | |
659 | ||
660 | /* For normal frames, %pc is stored at 4(%fp). */ | |
661 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
662 | ||
663 | cache->pc = frame_func_unwind (next_frame); | |
664 | if (cache->pc != 0) | |
665 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
666 | ||
667 | if (cache->locals < 0) | |
668 | { | |
669 | /* We didn't find a valid frame, which means that CACHE->base | |
670 | currently holds the frame pointer for our calling frame. If | |
671 | we're at the start of a function, or somewhere half-way its | |
672 | prologue, the function's frame probably hasn't been fully | |
673 | setup yet. Try to reconstruct the base address for the stack | |
674 | frame by looking at the stack pointer. For truly "frameless" | |
675 | functions this might work too. */ | |
676 | ||
677 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
678 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
679 | } | |
7f8e7424 | 680 | |
8de307e0 AS |
681 | /* Now that we have the base address for the stack frame we can |
682 | calculate the value of %sp in the calling frame. */ | |
683 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 684 | |
8de307e0 AS |
685 | /* Adjust all the saved registers such that they contain addresses |
686 | instead of offsets. */ | |
687 | for (i = 0; i < M68K_NUM_REGS; i++) | |
688 | if (cache->saved_regs[i] != -1) | |
689 | cache->saved_regs[i] += cache->base; | |
c906108c | 690 | |
8de307e0 AS |
691 | return cache; |
692 | } | |
c906108c | 693 | |
8de307e0 AS |
694 | static void |
695 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
696 | struct frame_id *this_id) | |
697 | { | |
698 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 699 | |
8de307e0 AS |
700 | /* This marks the outermost frame. */ |
701 | if (cache->base == 0) | |
702 | return; | |
c5aa993b | 703 | |
8de307e0 AS |
704 | /* See the end of m68k_push_dummy_call. */ |
705 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
706 | } | |
c5aa993b | 707 | |
8de307e0 AS |
708 | static void |
709 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
710 | int regnum, int *optimizedp, | |
711 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
712 | int *realnump, void *valuep) | |
713 | { | |
714 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
715 | ||
716 | gdb_assert (regnum >= 0); | |
717 | ||
718 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 719 | { |
8de307e0 AS |
720 | *optimizedp = 0; |
721 | *lvalp = not_lval; | |
722 | *addrp = 0; | |
723 | *realnump = -1; | |
724 | if (valuep) | |
c906108c | 725 | { |
8de307e0 AS |
726 | /* Store the value. */ |
727 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 728 | } |
8de307e0 AS |
729 | return; |
730 | } | |
731 | ||
732 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
733 | { | |
734 | *optimizedp = 0; | |
735 | *lvalp = lval_memory; | |
736 | *addrp = cache->saved_regs[regnum]; | |
737 | *realnump = -1; | |
738 | if (valuep) | |
89c3b6d3 | 739 | { |
8de307e0 AS |
740 | /* Read the value in from memory. */ |
741 | read_memory (*addrp, valuep, | |
742 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 743 | } |
8de307e0 | 744 | return; |
c906108c | 745 | } |
8de307e0 AS |
746 | |
747 | frame_register_unwind (next_frame, regnum, | |
748 | optimizedp, lvalp, addrp, realnump, valuep); | |
749 | } | |
750 | ||
751 | static const struct frame_unwind m68k_frame_unwind = | |
752 | { | |
753 | NORMAL_FRAME, | |
754 | m68k_frame_this_id, | |
755 | m68k_frame_prev_register | |
756 | }; | |
757 | ||
758 | static const struct frame_unwind * | |
336d1bba | 759 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
760 | { |
761 | return &m68k_frame_unwind; | |
762 | } | |
763 | \f | |
8de307e0 AS |
764 | static CORE_ADDR |
765 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
766 | { | |
767 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
768 | ||
769 | return cache->base; | |
770 | } | |
771 | ||
772 | static const struct frame_base m68k_frame_base = | |
773 | { | |
774 | &m68k_frame_unwind, | |
775 | m68k_frame_base_address, | |
776 | m68k_frame_base_address, | |
777 | m68k_frame_base_address | |
778 | }; | |
779 | ||
780 | static struct frame_id | |
781 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
782 | { | |
783 | char buf[4]; | |
784 | CORE_ADDR fp; | |
c906108c | 785 | |
8de307e0 AS |
786 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
787 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 788 | |
8de307e0 AS |
789 | /* See the end of m68k_push_dummy_call. */ |
790 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
791 | } | |
792 | \f | |
c5aa993b | 793 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
794 | |
795 | #include <sys/procfs.h> | |
796 | ||
c60c0f5f MS |
797 | /* Prototypes for supply_gregset etc. */ |
798 | #include "gregset.h" | |
799 | ||
c906108c | 800 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
801 | two different sets, the general register set (gregset) and the floating |
802 | point register set (fpregset). For each set, there is an ioctl to get | |
803 | the current register set and another ioctl to set the current values. | |
c906108c | 804 | |
c5aa993b JM |
805 | The actual structure passed through the ioctl interface is, of course, |
806 | naturally machine dependent, and is different for each set of registers. | |
807 | For the m68k for example, the general register set is typically defined | |
808 | by: | |
c906108c | 809 | |
c5aa993b | 810 | typedef int gregset_t[18]; |
c906108c | 811 | |
c5aa993b JM |
812 | #define R_D0 0 |
813 | ... | |
814 | #define R_PS 17 | |
c906108c | 815 | |
c5aa993b | 816 | and the floating point set by: |
c906108c | 817 | |
c5aa993b JM |
818 | typedef struct fpregset { |
819 | int f_pcr; | |
820 | int f_psr; | |
821 | int f_fpiaddr; | |
822 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
823 | } fpregset_t; | |
c906108c | 824 | |
c5aa993b JM |
825 | These routines provide the packing and unpacking of gregset_t and |
826 | fpregset_t formatted data. | |
c906108c SS |
827 | |
828 | */ | |
829 | ||
830 | /* Atari SVR4 has R_SR but not R_PS */ | |
831 | ||
832 | #if !defined (R_PS) && defined (R_SR) | |
833 | #define R_PS R_SR | |
834 | #endif | |
835 | ||
836 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
837 | unpack the register contents and supply them as gdb's idea of the current |
838 | register values. */ | |
c906108c SS |
839 | |
840 | void | |
fba45db2 | 841 | supply_gregset (gregset_t *gregsetp) |
c906108c | 842 | { |
52f0bd74 AC |
843 | int regi; |
844 | greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 845 | |
c5aa993b | 846 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
847 | { |
848 | supply_register (regi, (char *) (regp + regi)); | |
849 | } | |
850 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
851 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
852 | } | |
853 | ||
854 | void | |
fba45db2 | 855 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c | 856 | { |
52f0bd74 AC |
857 | int regi; |
858 | greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 859 | |
c5aa993b | 860 | for (regi = 0; regi < R_PC; regi++) |
c906108c | 861 | { |
8de307e0 AS |
862 | if (regno == -1 || regno == regi) |
863 | regcache_collect (regi, regp + regi); | |
c906108c | 864 | } |
8de307e0 AS |
865 | if (regno == -1 || regno == PS_REGNUM) |
866 | regcache_collect (PS_REGNUM, regp + R_PS); | |
867 | if (regno == -1 || regno == PC_REGNUM) | |
868 | regcache_collect (PC_REGNUM, regp + R_PC); | |
c906108c SS |
869 | } |
870 | ||
871 | #if defined (FP0_REGNUM) | |
872 | ||
873 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
874 | (fpregset_t *), unpack the register contents and supply them as gdb's |
875 | idea of the current floating point register values. */ | |
c906108c | 876 | |
c5aa993b | 877 | void |
fba45db2 | 878 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c | 879 | { |
52f0bd74 | 880 | int regi; |
c906108c | 881 | char *from; |
c5aa993b | 882 | |
32eeb91a | 883 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 884 | { |
c5aa993b | 885 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
886 | supply_register (regi, from); |
887 | } | |
32eeb91a AS |
888 | supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
889 | supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
890 | supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
891 | } |
892 | ||
893 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
894 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
895 | of the current floating point register set. If REGNO is -1, update | |
896 | them all. */ | |
c906108c SS |
897 | |
898 | void | |
fba45db2 | 899 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
900 | { |
901 | int regi; | |
c906108c | 902 | |
32eeb91a | 903 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 904 | { |
8de307e0 AS |
905 | if (regno == -1 || regno == regi) |
906 | regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); | |
c906108c | 907 | } |
8de307e0 AS |
908 | if (regno == -1 || regno == M68K_FPC_REGNUM) |
909 | regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr); | |
910 | if (regno == -1 || regno == M68K_FPS_REGNUM) | |
911 | regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr); | |
912 | if (regno == -1 || regno == M68K_FPI_REGNUM) | |
913 | regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr); | |
c906108c SS |
914 | } |
915 | ||
c5aa993b | 916 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 917 | |
c5aa993b | 918 | #endif /* USE_PROC_FS */ |
c906108c | 919 | |
c906108c SS |
920 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
921 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
922 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
923 | This routine returns true on success. */ | |
924 | ||
925 | int | |
f4281f55 | 926 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 927 | { |
35fc8285 | 928 | char *buf; |
c906108c | 929 | CORE_ADDR sp, jb_addr; |
eb2e12d7 AS |
930 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
931 | ||
932 | if (tdep->jb_pc < 0) | |
933 | { | |
934 | internal_error (__FILE__, __LINE__, | |
935 | "m68k_get_longjmp_target: not implemented"); | |
936 | return 0; | |
937 | } | |
c906108c | 938 | |
35fc8285 | 939 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 940 | sp = read_register (SP_REGNUM); |
c906108c | 941 | |
b5d78d39 GS |
942 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
943 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
944 | return 0; |
945 | ||
7c0b4a20 | 946 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c | 947 | |
eb2e12d7 | 948 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c906108c SS |
949 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
950 | return 0; | |
951 | ||
7c0b4a20 | 952 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
953 | return 1; |
954 | } | |
c906108c | 955 | |
152d9db6 GS |
956 | /* Function: m68k_gdbarch_init |
957 | Initializer function for the m68k gdbarch vector. | |
958 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
959 | ||
960 | static struct gdbarch * | |
961 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
962 | { | |
963 | struct gdbarch_tdep *tdep = NULL; | |
964 | struct gdbarch *gdbarch; | |
965 | ||
966 | /* find a candidate among the list of pre-declared architectures. */ | |
967 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
968 | if (arches != NULL) | |
969 | return (arches->gdbarch); | |
970 | ||
eb2e12d7 AS |
971 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
972 | gdbarch = gdbarch_alloc (&info, tdep); | |
152d9db6 | 973 | |
5d3ed2e3 GS |
974 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
975 | set_gdbarch_long_double_bit (gdbarch, 96); | |
976 | ||
5d3ed2e3 | 977 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 978 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
979 | |
980 | /* Stack grows down. */ | |
981 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
78bf922a | 982 | set_gdbarch_parm_boundary (gdbarch, 32); |
6300c360 GS |
983 | |
984 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 GS |
985 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
986 | ||
8de307e0 AS |
987 | set_gdbarch_extract_return_value (gdbarch, m68k_extract_return_value); |
988 | set_gdbarch_store_return_value (gdbarch, m68k_store_return_value); | |
74055713 | 989 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, m68k_extract_struct_value_address); |
c481dac7 | 990 | set_gdbarch_use_struct_convention (gdbarch, m68k_use_struct_convention); |
942dc0e9 | 991 | |
19772a2c | 992 | set_gdbarch_deprecated_frameless_function_invocation (gdbarch, m68k_frameless_function_invocation); |
6300c360 | 993 | set_gdbarch_frame_args_skip (gdbarch, 8); |
942dc0e9 | 994 | |
8de307e0 | 995 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 996 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
942dc0e9 GS |
997 | set_gdbarch_num_regs (gdbarch, 29); |
998 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); | |
32eeb91a | 999 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1000 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1001 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1002 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
a2c6a6d5 | 1003 | |
8de307e0 | 1004 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
6c0e89ed | 1005 | |
650fcc91 AS |
1006 | /* Disassembler. */ |
1007 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1008 | ||
eb2e12d7 AS |
1009 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1010 | tdep->jb_pc = JB_PC; | |
1011 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1012 | #else | |
1013 | tdep->jb_pc = -1; | |
1014 | #endif | |
c481dac7 | 1015 | tdep->struct_return = pcc_struct_return; |
8de307e0 AS |
1016 | |
1017 | /* Frame unwinder. */ | |
1018 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1019 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1020 | |
1021 | /* Hook in the DWARF CFI frame unwinder. */ | |
1022 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1023 | ||
8de307e0 | 1024 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1025 | |
55809acb AS |
1026 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1027 | gdbarch_init_osabi (info, gdbarch); | |
1028 | ||
eb2e12d7 AS |
1029 | /* Now we have tuned the configuration, set a few final things, |
1030 | based on what the OS ABI has told us. */ | |
1031 | ||
1032 | if (tdep->jb_pc >= 0) | |
1033 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1034 | ||
336d1bba | 1035 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1036 | |
152d9db6 GS |
1037 | return gdbarch; |
1038 | } | |
1039 | ||
1040 | ||
1041 | static void | |
1042 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1043 | { | |
eb2e12d7 | 1044 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1045 | |
eb2e12d7 AS |
1046 | if (tdep == NULL) |
1047 | return; | |
152d9db6 | 1048 | } |
2acceee2 | 1049 | |
a78f21af AC |
1050 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1051 | ||
c906108c | 1052 | void |
fba45db2 | 1053 | _initialize_m68k_tdep (void) |
c906108c | 1054 | { |
152d9db6 | 1055 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1056 | } |