Commit | Line | Data |
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c906108c | 1 | /* Target dependent code for the Motorola 68000 series. |
b6ba6518 | 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001 |
a1de33a8 | 3 | Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
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 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
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. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "symtab.h" | |
25 | #include "gdbcore.h" | |
26 | #include "value.h" | |
27 | #include "gdb_string.h" | |
7a292a7a | 28 | #include "inferior.h" |
4e052eda | 29 | #include "regcache.h" |
5d3ed2e3 | 30 | #include "arch-utils.h" |
32eeb91a AS |
31 | |
32 | #include "m68k-tdep.h" | |
c906108c | 33 | \f |
c5aa993b | 34 | |
89c3b6d3 PDM |
35 | #define P_LINKL_FP 0x480e |
36 | #define P_LINKW_FP 0x4e56 | |
37 | #define P_PEA_FP 0x4856 | |
38 | #define P_MOVL_SP_FP 0x2c4f | |
39 | #define P_MOVL 0x207c | |
40 | #define P_JSR 0x4eb9 | |
41 | #define P_BSR 0x61ff | |
42 | #define P_LEAL 0x43fb | |
43 | #define P_MOVML 0x48ef | |
44 | #define P_FMOVM 0xf237 | |
45 | #define P_TRAP 0x4e40 | |
46 | ||
103a1597 | 47 | |
103a1597 GS |
48 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
49 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
50 | ||
51 | #define NUM_FREGS (NUM_REGS-24) | |
52 | ||
53 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
54 | ||
55 | #define SP_ARG0 (1 * 4) | |
56 | ||
57 | /* This was determined by experimentation on hp300 BSD 4.3. Perhaps | |
58 | it corresponds to some offset in /usr/include/sys/user.h or | |
59 | something like that. Using some system include file would | |
60 | have the advantage of probably being more robust in the face | |
61 | of OS upgrades, but the disadvantage of being wrong for | |
62 | cross-debugging. */ | |
63 | ||
64 | #define SIG_PC_FP_OFFSET 530 | |
65 | ||
66 | #define TARGET_M68K | |
67 | ||
68 | ||
69 | #if !defined (BPT_VECTOR) | |
70 | #define BPT_VECTOR 0xf | |
71 | #endif | |
72 | ||
73 | #if !defined (REMOTE_BPT_VECTOR) | |
74 | #define REMOTE_BPT_VECTOR 1 | |
75 | #endif | |
76 | ||
77 | ||
7f8e7424 GS |
78 | void m68k_frame_init_saved_regs (struct frame_info *frame_info); |
79 | ||
103a1597 GS |
80 | |
81 | /* gdbarch_breakpoint_from_pc is set to m68k_local_breakpoint_from_pc | |
82 | so m68k_remote_breakpoint_from_pc is currently not used. */ | |
83 | ||
84 | const static unsigned char * | |
85 | m68k_remote_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
86 | { | |
87 | static unsigned char break_insn[] = {0x4e, (0x40 | REMOTE_BPT_VECTOR)}; | |
88 | *lenptr = sizeof (break_insn); | |
89 | return break_insn; | |
90 | } | |
91 | ||
92 | const static unsigned char * | |
93 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
94 | { | |
95 | static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; | |
96 | *lenptr = sizeof (break_insn); | |
97 | return break_insn; | |
98 | } | |
99 | ||
100 | ||
942dc0e9 | 101 | static int |
5ae5f592 | 102 | m68k_register_bytes_ok (long numbytes) |
942dc0e9 GS |
103 | { |
104 | return ((numbytes == REGISTER_BYTES_FP) | |
105 | || (numbytes == REGISTER_BYTES_NOFP)); | |
106 | } | |
107 | ||
5d3ed2e3 GS |
108 | /* Number of bytes of storage in the actual machine representation |
109 | for register regnum. On the 68000, all regs are 4 bytes | |
110 | except the floating point regs which are 12 bytes. */ | |
111 | /* Note that the unsigned cast here forces the result of the | |
112 | subtraction to very high positive values if regnum < FP0_REGNUM */ | |
113 | ||
114 | static int | |
115 | m68k_register_raw_size (int regnum) | |
116 | { | |
117 | return (((unsigned) (regnum) - FP0_REGNUM) < 8 ? 12 : 4); | |
118 | } | |
119 | ||
120 | /* Number of bytes of storage in the program's representation | |
121 | for register regnum. On the 68000, all regs are 4 bytes | |
122 | except the floating point regs which are 12-byte long doubles. */ | |
123 | ||
124 | static int | |
125 | m68k_register_virtual_size (int regnum) | |
126 | { | |
127 | return (((unsigned) (regnum) - FP0_REGNUM) < 8 ? 12 : 4); | |
128 | } | |
129 | ||
d85fe7f7 AS |
130 | /* Return the GDB type object for the "standard" data type of data in |
131 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
132 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
133 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
134 | addresses return pointer to void, not pointer to char, because we | |
135 | don't want to attempt to print the string after printing the | |
136 | address. */ | |
5d3ed2e3 GS |
137 | |
138 | static struct type * | |
139 | m68k_register_virtual_type (int regnum) | |
140 | { | |
03dac896 AS |
141 | if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
142 | return builtin_type_m68881_ext; | |
143 | ||
32eeb91a | 144 | if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
03dac896 AS |
145 | return builtin_type_void_func_ptr; |
146 | ||
32eeb91a AS |
147 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
148 | || regnum == PS_REGNUM) | |
03dac896 AS |
149 | return builtin_type_int32; |
150 | ||
32eeb91a | 151 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
152 | return builtin_type_void_data_ptr; |
153 | ||
154 | return builtin_type_int32; | |
5d3ed2e3 GS |
155 | } |
156 | ||
157 | /* Function: m68k_register_name | |
158 | Returns the name of the standard m68k register regnum. */ | |
159 | ||
160 | static const char * | |
161 | m68k_register_name (int regnum) | |
162 | { | |
163 | static char *register_names[] = { | |
164 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
165 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
166 | "ps", "pc", | |
167 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
168 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" | |
169 | }; | |
170 | ||
171 | if (regnum < 0 || | |
172 | regnum >= sizeof (register_names) / sizeof (register_names[0])) | |
173 | internal_error (__FILE__, __LINE__, | |
174 | "m68k_register_name: illegal register number %d", regnum); | |
175 | else | |
176 | return register_names[regnum]; | |
177 | } | |
178 | ||
179 | /* Stack must be kept short aligned when doing function calls. */ | |
180 | ||
181 | static CORE_ADDR | |
182 | m68k_stack_align (CORE_ADDR addr) | |
183 | { | |
184 | return ((addr + 1) & ~1); | |
185 | } | |
186 | ||
187 | /* Index within `registers' of the first byte of the space for | |
188 | register regnum. */ | |
189 | ||
190 | static int | |
191 | m68k_register_byte (int regnum) | |
192 | { | |
32eeb91a AS |
193 | if (regnum >= M68K_FPC_REGNUM) |
194 | return (((regnum - M68K_FPC_REGNUM) * 4) + 168); | |
5d3ed2e3 GS |
195 | else if (regnum >= FP0_REGNUM) |
196 | return (((regnum - FP0_REGNUM) * 12) + 72); | |
197 | else | |
198 | return (regnum * 4); | |
199 | } | |
200 | ||
942dc0e9 GS |
201 | /* Store the address of the place in which to copy the structure the |
202 | subroutine will return. This is called from call_function. */ | |
203 | ||
204 | static void | |
205 | m68k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) | |
206 | { | |
32eeb91a | 207 | write_register (M68K_A1_REGNUM, addr); |
942dc0e9 GS |
208 | } |
209 | ||
210 | /* Extract from an array regbuf containing the (raw) register state | |
211 | a function return value of type type, and copy that, in virtual format, | |
212 | into valbuf. This is assuming that floating point values are returned | |
213 | as doubles in d0/d1. */ | |
214 | ||
215 | static void | |
216 | m68k_deprecated_extract_return_value (struct type *type, char *regbuf, | |
217 | char *valbuf) | |
218 | { | |
219 | int offset = 0; | |
220 | int typeLength = TYPE_LENGTH (type); | |
221 | ||
222 | if (typeLength < 4) | |
223 | offset = 4 - typeLength; | |
224 | ||
225 | memcpy (valbuf, regbuf + offset, typeLength); | |
226 | } | |
227 | ||
228 | static CORE_ADDR | |
229 | m68k_deprecated_extract_struct_value_address (char *regbuf) | |
230 | { | |
231 | return (*(CORE_ADDR *) (regbuf)); | |
232 | } | |
233 | ||
234 | /* Write into appropriate registers a function return value | |
235 | of type TYPE, given in virtual format. Assumes floats are passed | |
236 | in d0/d1. */ | |
237 | ||
238 | static void | |
239 | m68k_store_return_value (struct type *type, char *valbuf) | |
240 | { | |
73937e03 | 241 | deprecated_write_register_bytes (0, valbuf, TYPE_LENGTH (type)); |
942dc0e9 GS |
242 | } |
243 | ||
244 | /* Describe the pointer in each stack frame to the previous stack frame | |
245 | (its caller). */ | |
246 | ||
247 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
248 | chain-pointer. | |
249 | In the case of the 68000, the frame's nominal address | |
250 | is the address of a 4-byte word containing the calling frame's address. */ | |
251 | ||
252 | /* If we are chaining from sigtramp, then manufacture a sigtramp frame | |
253 | (which isn't really on the stack. I'm not sure this is right for anything | |
254 | but BSD4.3 on an hp300. */ | |
255 | ||
256 | static CORE_ADDR | |
257 | m68k_frame_chain (struct frame_info *thisframe) | |
258 | { | |
32eeb91a | 259 | if (get_frame_type (thisframe) == SIGTRAMP_FRAME) |
942dc0e9 | 260 | return thisframe->frame; |
32eeb91a | 261 | else if (!inside_entry_file (thisframe->pc)) |
b5fc49aa | 262 | return read_memory_unsigned_integer (thisframe->frame, 4); |
942dc0e9 GS |
263 | else |
264 | return 0; | |
265 | } | |
266 | ||
267 | /* A function that tells us whether the function invocation represented | |
268 | by fi does not have a frame on the stack associated with it. If it | |
269 | does not, FRAMELESS is set to 1, else 0. */ | |
270 | ||
271 | static int | |
272 | m68k_frameless_function_invocation (struct frame_info *fi) | |
273 | { | |
32eeb91a | 274 | if (get_frame_type (fi) == SIGTRAMP_FRAME) |
942dc0e9 GS |
275 | return 0; |
276 | else | |
277 | return frameless_look_for_prologue (fi); | |
278 | } | |
279 | ||
280 | static CORE_ADDR | |
281 | m68k_frame_saved_pc (struct frame_info *frame) | |
282 | { | |
32eeb91a | 283 | if (get_frame_type (frame) == SIGTRAMP_FRAME) |
942dc0e9 GS |
284 | { |
285 | if (frame->next) | |
b5fc49aa AS |
286 | return read_memory_unsigned_integer (frame->next->frame |
287 | + SIG_PC_FP_OFFSET, 4); | |
942dc0e9 | 288 | else |
b5fc49aa AS |
289 | return read_memory_unsigned_integer (read_register (SP_REGNUM) |
290 | + SIG_PC_FP_OFFSET - 8, 4); | |
942dc0e9 GS |
291 | } |
292 | else | |
b5fc49aa | 293 | return read_memory_unsigned_integer (frame->frame + 4, 4); |
942dc0e9 GS |
294 | } |
295 | ||
296 | ||
b83266a0 SS |
297 | /* The only reason this is here is the tm-altos.h reference below. It |
298 | was moved back here from tm-m68k.h. FIXME? */ | |
299 | ||
300 | extern CORE_ADDR | |
fba45db2 | 301 | altos_skip_prologue (CORE_ADDR pc) |
b83266a0 | 302 | { |
b5fc49aa | 303 | register int op = read_memory_unsigned_integer (pc, 2); |
89c3b6d3 | 304 | if (op == P_LINKW_FP) |
c5aa993b | 305 | pc += 4; /* Skip link #word */ |
89c3b6d3 | 306 | else if (op == P_LINKL_FP) |
c5aa993b | 307 | pc += 6; /* Skip link #long */ |
b83266a0 | 308 | /* Not sure why branches are here. */ |
514e603d | 309 | /* From tm-altos.h */ |
b83266a0 | 310 | else if (op == 0060000) |
c5aa993b | 311 | pc += 4; /* Skip bra #word */ |
b83266a0 | 312 | else if (op == 00600377) |
c5aa993b | 313 | pc += 6; /* skip bra #long */ |
b83266a0 | 314 | else if ((op & 0177400) == 0060000) |
c5aa993b | 315 | pc += 2; /* skip bra #char */ |
b83266a0 SS |
316 | return pc; |
317 | } | |
318 | ||
89c3b6d3 | 319 | int |
fba45db2 | 320 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 321 | { |
1bd54964 AC |
322 | if (name != NULL) |
323 | return strcmp (name, "_sigcode") == 0; | |
324 | else | |
325 | return 0; | |
89c3b6d3 PDM |
326 | } |
327 | ||
328 | CORE_ADDR | |
fba45db2 | 329 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
330 | { |
331 | /* we assume here that the only frameless functions are the system calls | |
332 | or other functions who do not put anything on the stack. */ | |
32eeb91a | 333 | if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
89c3b6d3 PDM |
334 | return frame_info->frame + 12; |
335 | else if (frameless_look_for_prologue (frame_info)) | |
336 | { | |
b5d78d39 | 337 | /* Check for an interrupted system call */ |
5a203e44 | 338 | if (frame_info->next && (get_frame_type (frame_info->next) == SIGTRAMP_FRAME)) |
b5d78d39 GS |
339 | return frame_info->next->frame + 16; |
340 | else | |
341 | return frame_info->frame + 4; | |
89c3b6d3 PDM |
342 | } |
343 | else | |
344 | return frame_info->frame; | |
345 | } | |
346 | ||
347 | CORE_ADDR | |
fba45db2 | 348 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 | 349 | { |
b5fc49aa AS |
350 | return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
351 | + 4, 4); | |
89c3b6d3 PDM |
352 | } |
353 | ||
392a587b JM |
354 | /* Return number of args passed to a frame. |
355 | Can return -1, meaning no way to tell. */ | |
356 | ||
357 | int | |
fba45db2 | 358 | isi_frame_num_args (struct frame_info *fi) |
392a587b JM |
359 | { |
360 | int val; | |
361 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
b5fc49aa | 362 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 363 | val = 0; |
c5aa993b | 364 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 365 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
366 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
367 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
368 | { |
369 | val = (insn >> 9) & 7; | |
370 | if (val == 0) | |
371 | val = 8; | |
372 | } | |
c5aa993b | 373 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
374 | val = read_memory_integer (pc + 2, 4); |
375 | val >>= 2; | |
376 | return val; | |
377 | } | |
378 | ||
379 | int | |
fba45db2 | 380 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
381 | { |
382 | int val; | |
383 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
b5fc49aa | 384 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 385 | val = 0; |
c5aa993b | 386 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 387 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
388 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
389 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
390 | { |
391 | val = (insn >> 9) & 7; | |
392 | if (val == 0) | |
393 | val = 8; | |
394 | } | |
c5aa993b | 395 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
396 | val = read_memory_integer (pc + 2, 4); |
397 | val >>= 2; | |
398 | return val; | |
399 | } | |
400 | ||
401 | int | |
fba45db2 | 402 | news_frame_num_args (struct frame_info *fi) |
392a587b JM |
403 | { |
404 | int val; | |
405 | CORE_ADDR pc = FRAME_SAVED_PC (fi); | |
b5fc49aa | 406 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 407 | val = 0; |
c5aa993b | 408 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 409 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
410 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
411 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
412 | { |
413 | val = (insn >> 9) & 7; | |
414 | if (val == 0) | |
415 | val = 8; | |
416 | } | |
c5aa993b | 417 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
418 | val = read_memory_integer (pc + 2, 4); |
419 | val >>= 2; | |
420 | return val; | |
421 | } | |
b83266a0 | 422 | |
7f8e7424 GS |
423 | /* Insert the specified number of args and function address |
424 | into a call sequence of the above form stored at DUMMYNAME. | |
425 | We use the BFD routines to store a big-endian value of known size. */ | |
426 | ||
427 | void | |
a2c6a6d5 GS |
428 | m68k_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, |
429 | struct value **args, struct type *type, int gcc_p) | |
7f8e7424 | 430 | { |
a2c6a6d5 GS |
431 | bfd_putb32 (fun, (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 2); |
432 | bfd_putb32 (nargs * 4, | |
433 | (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 8); | |
7f8e7424 GS |
434 | } |
435 | ||
436 | ||
c906108c SS |
437 | /* Push an empty stack frame, to record the current PC, etc. */ |
438 | ||
439 | void | |
fba45db2 | 440 | m68k_push_dummy_frame (void) |
c906108c SS |
441 | { |
442 | register CORE_ADDR sp = read_register (SP_REGNUM); | |
443 | register int regnum; | |
444 | char raw_buffer[12]; | |
445 | ||
446 | sp = push_word (sp, read_register (PC_REGNUM)); | |
447 | sp = push_word (sp, read_register (FP_REGNUM)); | |
448 | write_register (FP_REGNUM, sp); | |
449 | ||
450 | /* Always save the floating-point registers, whether they exist on | |
451 | this target or not. */ | |
452 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) | |
453 | { | |
73937e03 | 454 | deprecated_read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); |
c906108c SS |
455 | sp = push_bytes (sp, raw_buffer, 12); |
456 | } | |
457 | ||
458 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) | |
459 | { | |
460 | sp = push_word (sp, read_register (regnum)); | |
461 | } | |
462 | sp = push_word (sp, read_register (PS_REGNUM)); | |
463 | write_register (SP_REGNUM, sp); | |
464 | } | |
465 | ||
466 | /* Discard from the stack the innermost frame, | |
467 | restoring all saved registers. */ | |
468 | ||
469 | void | |
fba45db2 | 470 | m68k_pop_frame (void) |
c906108c SS |
471 | { |
472 | register struct frame_info *frame = get_current_frame (); | |
473 | register CORE_ADDR fp; | |
474 | register int regnum; | |
c906108c SS |
475 | char raw_buffer[12]; |
476 | ||
c193f6ac | 477 | fp = get_frame_base (frame); |
7f8e7424 | 478 | m68k_frame_init_saved_regs (frame); |
c5aa993b | 479 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) |
c906108c | 480 | { |
7f8e7424 | 481 | if (frame->saved_regs[regnum]) |
c906108c | 482 | { |
7f8e7424 | 483 | read_memory (frame->saved_regs[regnum], raw_buffer, 12); |
73937e03 AC |
484 | deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, |
485 | 12); | |
c906108c SS |
486 | } |
487 | } | |
c5aa993b | 488 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) |
c906108c | 489 | { |
7f8e7424 | 490 | if (frame->saved_regs[regnum]) |
c906108c | 491 | { |
a2c6a6d5 GS |
492 | write_register (regnum, |
493 | read_memory_integer (frame->saved_regs[regnum], 4)); | |
c906108c SS |
494 | } |
495 | } | |
7f8e7424 | 496 | if (frame->saved_regs[PS_REGNUM]) |
c906108c | 497 | { |
b5d78d39 | 498 | write_register (PS_REGNUM, |
7f8e7424 | 499 | read_memory_integer (frame->saved_regs[PS_REGNUM], 4)); |
c906108c SS |
500 | } |
501 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); | |
502 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); | |
503 | write_register (SP_REGNUM, fp + 8); | |
504 | flush_cached_frames (); | |
505 | } | |
c906108c | 506 | \f |
c5aa993b | 507 | |
c906108c SS |
508 | /* Given an ip value corresponding to the start of a function, |
509 | return the ip of the first instruction after the function | |
510 | prologue. This is the generic m68k support. Machines which | |
511 | require something different can override the SKIP_PROLOGUE | |
512 | macro to point elsewhere. | |
513 | ||
514 | Some instructions which typically may appear in a function | |
515 | prologue include: | |
516 | ||
517 | A link instruction, word form: | |
518 | ||
c5aa993b | 519 | link.w %a6,&0 4e56 XXXX |
c906108c SS |
520 | |
521 | A link instruction, long form: | |
522 | ||
c5aa993b | 523 | link.l %fp,&F%1 480e XXXX XXXX |
c906108c SS |
524 | |
525 | A movm instruction to preserve integer regs: | |
526 | ||
c5aa993b | 527 | movm.l &M%1,(4,%sp) 48ef XXXX XXXX |
c906108c SS |
528 | |
529 | A fmovm instruction to preserve float regs: | |
530 | ||
c5aa993b | 531 | fmovm &FPM%1,(FPO%1,%sp) f237 XXXX XXXX XXXX XXXX |
c906108c SS |
532 | |
533 | Some profiling setup code (FIXME, not recognized yet): | |
534 | ||
c5aa993b JM |
535 | lea.l (.L3,%pc),%a1 43fb XXXX XXXX XXXX |
536 | bsr _mcount 61ff XXXX XXXX | |
c906108c | 537 | |
c5aa993b | 538 | */ |
c906108c | 539 | |
c906108c | 540 | CORE_ADDR |
fba45db2 | 541 | m68k_skip_prologue (CORE_ADDR ip) |
c906108c SS |
542 | { |
543 | register CORE_ADDR limit; | |
544 | struct symtab_and_line sal; | |
545 | register int op; | |
546 | ||
547 | /* Find out if there is a known limit for the extent of the prologue. | |
548 | If so, ensure we don't go past it. If not, assume "infinity". */ | |
549 | ||
550 | sal = find_pc_line (ip, 0); | |
b5d78d39 | 551 | limit = (sal.end) ? sal.end : (CORE_ADDR) ~0; |
c906108c SS |
552 | |
553 | while (ip < limit) | |
554 | { | |
b5fc49aa | 555 | op = read_memory_unsigned_integer (ip, 2); |
c5aa993b | 556 | |
89c3b6d3 PDM |
557 | if (op == P_LINKW_FP) |
558 | ip += 4; /* Skip link.w */ | |
559 | else if (op == P_PEA_FP) | |
c5aa993b | 560 | ip += 2; /* Skip pea %fp */ |
89c3b6d3 | 561 | else if (op == P_MOVL_SP_FP) |
c5aa993b | 562 | ip += 2; /* Skip move.l %sp, %fp */ |
89c3b6d3 PDM |
563 | else if (op == P_LINKL_FP) |
564 | ip += 6; /* Skip link.l */ | |
565 | else if (op == P_MOVML) | |
566 | ip += 6; /* Skip movm.l */ | |
c906108c | 567 | else if (op == P_FMOVM) |
89c3b6d3 | 568 | ip += 10; /* Skip fmovm */ |
c906108c | 569 | else |
b5d78d39 | 570 | break; /* Found unknown code, bail out. */ |
c906108c SS |
571 | } |
572 | return (ip); | |
573 | } | |
574 | ||
7f8e7424 GS |
575 | /* Store the addresses of the saved registers of the frame described by |
576 | FRAME_INFO in its saved_regs field. | |
577 | This includes special registers such as pc and fp saved in special | |
578 | ways in the stack frame. sp is even more special: | |
579 | the address we return for it IS the sp for the next frame. */ | |
580 | ||
c906108c | 581 | void |
7f8e7424 | 582 | m68k_frame_init_saved_regs (struct frame_info *frame_info) |
c906108c | 583 | { |
c5aa993b JM |
584 | register int regnum; |
585 | register int regmask; | |
586 | register CORE_ADDR next_addr; | |
c906108c SS |
587 | register CORE_ADDR pc; |
588 | ||
589 | /* First possible address for a pc in a call dummy for this frame. */ | |
590 | CORE_ADDR possible_call_dummy_start = | |
b5fc49aa | 591 | frame_info->frame - 28 - FP_REGNUM * 4 - 4 - 8 * 12; |
c906108c SS |
592 | |
593 | int nextinsn; | |
7f8e7424 GS |
594 | |
595 | if (frame_info->saved_regs) | |
596 | return; | |
597 | ||
598 | frame_saved_regs_zalloc (frame_info); | |
599 | ||
600 | memset (frame_info->saved_regs, 0, SIZEOF_FRAME_SAVED_REGS); | |
601 | ||
b5fc49aa AS |
602 | if (frame_info->pc >= possible_call_dummy_start |
603 | && frame_info->pc <= frame_info->frame) | |
c906108c SS |
604 | { |
605 | ||
606 | /* It is a call dummy. We could just stop now, since we know | |
c5aa993b JM |
607 | what the call dummy saves and where. But this code proceeds |
608 | to parse the "prologue" which is part of the call dummy. | |
609 | This is needlessly complex and confusing. FIXME. */ | |
c906108c | 610 | |
b5fc49aa | 611 | next_addr = frame_info->frame; |
c906108c SS |
612 | pc = possible_call_dummy_start; |
613 | } | |
c5aa993b | 614 | else |
c906108c | 615 | { |
b5fc49aa | 616 | pc = get_pc_function_start (frame_info->pc); |
c906108c | 617 | |
b5fc49aa | 618 | nextinsn = read_memory_unsigned_integer (pc, 2); |
89c3b6d3 | 619 | if (P_PEA_FP == nextinsn |
b5fc49aa | 620 | && P_MOVL_SP_FP == read_memory_unsigned_integer (pc + 2, 2)) |
c906108c | 621 | { |
89c3b6d3 | 622 | /* pea %fp |
c5aa993b | 623 | move.l %sp, %fp */ |
c906108c | 624 | next_addr = frame_info->frame; |
89c3b6d3 | 625 | pc += 4; |
c906108c | 626 | } |
89c3b6d3 | 627 | else if (P_LINKL_FP == nextinsn) |
c906108c SS |
628 | /* link.l %fp */ |
629 | /* Find the address above the saved | |
630 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 | 631 | { |
b5fc49aa | 632 | next_addr = frame_info->frame + read_memory_integer (pc + 2, 4); |
89c3b6d3 PDM |
633 | pc += 6; |
634 | } | |
635 | else if (P_LINKW_FP == nextinsn) | |
c906108c SS |
636 | /* link.w %fp */ |
637 | /* Find the address above the saved | |
638 | regs using the amount of storage from the link instruction. */ | |
89c3b6d3 | 639 | { |
b5fc49aa | 640 | next_addr = frame_info->frame + read_memory_integer (pc + 2, 2); |
89c3b6d3 PDM |
641 | pc += 4; |
642 | } | |
c5aa993b JM |
643 | else |
644 | goto lose; | |
645 | ||
646 | /* If have an addal #-n, sp next, adjust next_addr. */ | |
b5fc49aa | 647 | if (read_memory_unsigned_integer (pc, 2) == 0157774) |
c5aa993b JM |
648 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; |
649 | } | |
c5aa993b | 650 | |
b5d78d39 | 651 | for (;;) |
c5aa993b | 652 | { |
b5fc49aa AS |
653 | nextinsn = read_memory_unsigned_integer (pc, 2); |
654 | regmask = read_memory_unsigned_integer (pc + 2, 2); | |
89c3b6d3 PDM |
655 | /* fmovemx to -(sp) */ |
656 | if (0xf227 == nextinsn && (regmask & 0xff00) == 0xe000) | |
c906108c | 657 | { |
89c3b6d3 PDM |
658 | /* Regmask's low bit is for register fp7, the first pushed */ |
659 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
660 | if (regmask & 1) | |
7f8e7424 | 661 | frame_info->saved_regs[regnum] = (next_addr -= 12); |
89c3b6d3 PDM |
662 | pc += 4; |
663 | } | |
664 | /* fmovemx to (fp + displacement) */ | |
665 | else if (0171056 == nextinsn && (regmask & 0xff00) == 0xf000) | |
666 | { | |
667 | register CORE_ADDR addr; | |
668 | ||
b5fc49aa | 669 | addr = frame_info->frame + read_memory_integer (pc + 4, 2); |
89c3b6d3 PDM |
670 | /* Regmask's low bit is for register fp7, the first pushed */ |
671 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
672 | if (regmask & 1) | |
673 | { | |
7f8e7424 | 674 | frame_info->saved_regs[regnum] = addr; |
89c3b6d3 PDM |
675 | addr += 12; |
676 | } | |
677 | pc += 6; | |
678 | } | |
679 | /* moveml to (sp) */ | |
680 | else if (0044327 == nextinsn) | |
681 | { | |
682 | /* Regmask's low bit is for register 0, the first written */ | |
683 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
684 | if (regmask & 1) | |
685 | { | |
7f8e7424 | 686 | frame_info->saved_regs[regnum] = next_addr; |
89c3b6d3 PDM |
687 | next_addr += 4; |
688 | } | |
689 | pc += 4; | |
690 | } | |
691 | /* moveml to (fp + displacement) */ | |
692 | else if (0044356 == nextinsn) | |
693 | { | |
694 | register CORE_ADDR addr; | |
695 | ||
b5fc49aa | 696 | addr = frame_info->frame + read_memory_integer (pc + 4, 2); |
89c3b6d3 PDM |
697 | /* Regmask's low bit is for register 0, the first written */ |
698 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) | |
699 | if (regmask & 1) | |
700 | { | |
7f8e7424 | 701 | frame_info->saved_regs[regnum] = addr; |
89c3b6d3 PDM |
702 | addr += 4; |
703 | } | |
704 | pc += 6; | |
705 | } | |
706 | /* moveml to -(sp) */ | |
707 | else if (0044347 == nextinsn) | |
708 | { | |
709 | /* Regmask's low bit is for register 15, the first pushed */ | |
710 | for (regnum = 16; --regnum >= 0; regmask >>= 1) | |
711 | if (regmask & 1) | |
7f8e7424 | 712 | frame_info->saved_regs[regnum] = (next_addr -= 4); |
89c3b6d3 PDM |
713 | pc += 4; |
714 | } | |
715 | /* movl r,-(sp) */ | |
716 | else if (0x2f00 == (0xfff0 & nextinsn)) | |
717 | { | |
718 | regnum = 0xf & nextinsn; | |
7f8e7424 | 719 | frame_info->saved_regs[regnum] = (next_addr -= 4); |
89c3b6d3 | 720 | pc += 2; |
c906108c | 721 | } |
89c3b6d3 PDM |
722 | /* fmovemx to index of sp */ |
723 | else if (0xf236 == nextinsn && (regmask & 0xff00) == 0xf000) | |
724 | { | |
725 | /* Regmask's low bit is for register fp0, the first written */ | |
726 | for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) | |
727 | if (regmask & 1) | |
728 | { | |
7f8e7424 | 729 | frame_info->saved_regs[regnum] = next_addr; |
89c3b6d3 PDM |
730 | next_addr += 12; |
731 | } | |
732 | pc += 10; | |
733 | } | |
734 | /* clrw -(sp); movw ccr,-(sp) */ | |
735 | else if (0x4267 == nextinsn && 0x42e7 == regmask) | |
736 | { | |
7f8e7424 | 737 | frame_info->saved_regs[PS_REGNUM] = (next_addr -= 4); |
89c3b6d3 PDM |
738 | pc += 4; |
739 | } | |
740 | else | |
741 | break; | |
c906108c | 742 | } |
c5aa993b | 743 | lose:; |
7f8e7424 GS |
744 | frame_info->saved_regs[SP_REGNUM] = (frame_info)->frame + 8; |
745 | frame_info->saved_regs[FP_REGNUM] = (frame_info)->frame; | |
746 | frame_info->saved_regs[PC_REGNUM] = (frame_info)->frame + 4; | |
c906108c SS |
747 | #ifdef SIG_SP_FP_OFFSET |
748 | /* Adjust saved SP_REGNUM for fake _sigtramp frames. */ | |
5a203e44 | 749 | if ((get_frame_type (frame_info) == SIGTRAMP_FRAME) && frame_info->next) |
7f8e7424 GS |
750 | frame_info->saved_regs[SP_REGNUM] = |
751 | frame_info->next->frame + SIG_SP_FP_OFFSET; | |
c906108c SS |
752 | #endif |
753 | } | |
754 | ||
755 | ||
c5aa993b | 756 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
757 | |
758 | #include <sys/procfs.h> | |
759 | ||
c60c0f5f MS |
760 | /* Prototypes for supply_gregset etc. */ |
761 | #include "gregset.h" | |
762 | ||
c906108c | 763 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
764 | two different sets, the general register set (gregset) and the floating |
765 | point register set (fpregset). For each set, there is an ioctl to get | |
766 | the current register set and another ioctl to set the current values. | |
c906108c | 767 | |
c5aa993b JM |
768 | The actual structure passed through the ioctl interface is, of course, |
769 | naturally machine dependent, and is different for each set of registers. | |
770 | For the m68k for example, the general register set is typically defined | |
771 | by: | |
c906108c | 772 | |
c5aa993b | 773 | typedef int gregset_t[18]; |
c906108c | 774 | |
c5aa993b JM |
775 | #define R_D0 0 |
776 | ... | |
777 | #define R_PS 17 | |
c906108c | 778 | |
c5aa993b | 779 | and the floating point set by: |
c906108c | 780 | |
c5aa993b JM |
781 | typedef struct fpregset { |
782 | int f_pcr; | |
783 | int f_psr; | |
784 | int f_fpiaddr; | |
785 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
786 | } fpregset_t; | |
c906108c | 787 | |
c5aa993b JM |
788 | These routines provide the packing and unpacking of gregset_t and |
789 | fpregset_t formatted data. | |
c906108c SS |
790 | |
791 | */ | |
792 | ||
793 | /* Atari SVR4 has R_SR but not R_PS */ | |
794 | ||
795 | #if !defined (R_PS) && defined (R_SR) | |
796 | #define R_PS R_SR | |
797 | #endif | |
798 | ||
799 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
800 | unpack the register contents and supply them as gdb's idea of the current |
801 | register values. */ | |
c906108c SS |
802 | |
803 | void | |
fba45db2 | 804 | supply_gregset (gregset_t *gregsetp) |
c906108c SS |
805 | { |
806 | register int regi; | |
807 | register greg_t *regp = (greg_t *) gregsetp; | |
808 | ||
c5aa993b | 809 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
810 | { |
811 | supply_register (regi, (char *) (regp + regi)); | |
812 | } | |
813 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
814 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
815 | } | |
816 | ||
817 | void | |
fba45db2 | 818 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c SS |
819 | { |
820 | register int regi; | |
821 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 822 | |
c5aa993b | 823 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
824 | { |
825 | if ((regno == -1) || (regno == regi)) | |
826 | { | |
524d7c18 | 827 | *(regp + regi) = *(int *) &deprecated_registers[REGISTER_BYTE (regi)]; |
c906108c SS |
828 | } |
829 | } | |
830 | if ((regno == -1) || (regno == PS_REGNUM)) | |
831 | { | |
524d7c18 | 832 | *(regp + R_PS) = *(int *) &deprecated_registers[REGISTER_BYTE (PS_REGNUM)]; |
c906108c SS |
833 | } |
834 | if ((regno == -1) || (regno == PC_REGNUM)) | |
835 | { | |
524d7c18 | 836 | *(regp + R_PC) = *(int *) &deprecated_registers[REGISTER_BYTE (PC_REGNUM)]; |
c906108c SS |
837 | } |
838 | } | |
839 | ||
840 | #if defined (FP0_REGNUM) | |
841 | ||
842 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
843 | (fpregset_t *), unpack the register contents and supply them as gdb's |
844 | idea of the current floating point register values. */ | |
c906108c | 845 | |
c5aa993b | 846 | void |
fba45db2 | 847 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c SS |
848 | { |
849 | register int regi; | |
850 | char *from; | |
c5aa993b | 851 | |
32eeb91a | 852 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 853 | { |
c5aa993b | 854 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
855 | supply_register (regi, from); |
856 | } | |
32eeb91a AS |
857 | supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
858 | supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
859 | supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
860 | } |
861 | ||
862 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
863 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
864 | of the current floating point register set. If REGNO is -1, update | |
865 | them all. */ | |
c906108c SS |
866 | |
867 | void | |
fba45db2 | 868 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
869 | { |
870 | int regi; | |
871 | char *to; | |
872 | char *from; | |
c906108c | 873 | |
32eeb91a | 874 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c SS |
875 | { |
876 | if ((regno == -1) || (regno == regi)) | |
877 | { | |
524d7c18 | 878 | from = (char *) &deprecated_registers[REGISTER_BYTE (regi)]; |
c5aa993b | 879 | to = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
880 | memcpy (to, from, REGISTER_RAW_SIZE (regi)); |
881 | } | |
882 | } | |
32eeb91a | 883 | if ((regno == -1) || (regno == M68K_FPC_REGNUM)) |
c906108c | 884 | { |
32eeb91a | 885 | fpregsetp->f_pcr = *(int *) &deprecated_registers[REGISTER_BYTE (M68K_FPC_REGNUM)]; |
c906108c | 886 | } |
32eeb91a | 887 | if ((regno == -1) || (regno == M68K_FPS_REGNUM)) |
c906108c | 888 | { |
32eeb91a | 889 | fpregsetp->f_psr = *(int *) &deprecated_registers[REGISTER_BYTE (M68K_FPS_REGNUM)]; |
c906108c | 890 | } |
32eeb91a | 891 | if ((regno == -1) || (regno == M68K_FPI_REGNUM)) |
c906108c | 892 | { |
32eeb91a | 893 | fpregsetp->f_fpiaddr = *(int *) &deprecated_registers[REGISTER_BYTE (M68K_FPI_REGNUM)]; |
c906108c SS |
894 | } |
895 | } | |
896 | ||
c5aa993b | 897 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 898 | |
c5aa993b | 899 | #endif /* USE_PROC_FS */ |
c906108c | 900 | |
c906108c SS |
901 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
902 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
903 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
904 | This routine returns true on success. */ | |
905 | ||
2765b798 AC |
906 | /* NOTE: cagney/2000-11-08: For this function to be fully multi-arched |
907 | the macro's JB_PC and JB_ELEMENT_SIZE would need to be moved into | |
908 | the ``struct gdbarch_tdep'' object and then set on a target ISA/ABI | |
909 | dependant basis. */ | |
910 | ||
c906108c | 911 | int |
f4281f55 | 912 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 913 | { |
2765b798 | 914 | #if defined (JB_PC) && defined (JB_ELEMENT_SIZE) |
35fc8285 | 915 | char *buf; |
c906108c SS |
916 | CORE_ADDR sp, jb_addr; |
917 | ||
35fc8285 | 918 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 919 | sp = read_register (SP_REGNUM); |
c906108c | 920 | |
b5d78d39 GS |
921 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
922 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
923 | return 0; |
924 | ||
925 | jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
926 | ||
927 | if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, | |
928 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
929 | return 0; | |
930 | ||
931 | *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); | |
932 | ||
933 | return 1; | |
2765b798 | 934 | #else |
8e65ff28 AC |
935 | internal_error (__FILE__, __LINE__, |
936 | "m68k_get_longjmp_target: not implemented"); | |
2765b798 AC |
937 | return 0; |
938 | #endif | |
c906108c | 939 | } |
c906108c SS |
940 | |
941 | /* Immediately after a function call, return the saved pc before the frame | |
942 | is setup. For sun3's, we check for the common case of being inside of a | |
943 | system call, and if so, we know that Sun pushes the call # on the stack | |
944 | prior to doing the trap. */ | |
945 | ||
946 | CORE_ADDR | |
fba45db2 | 947 | m68k_saved_pc_after_call (struct frame_info *frame) |
c906108c SS |
948 | { |
949 | #ifdef SYSCALL_TRAP | |
950 | int op; | |
951 | ||
b5fc49aa | 952 | op = read_memory_unsigned_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); |
c906108c SS |
953 | |
954 | if (op == SYSCALL_TRAP) | |
b5fc49aa | 955 | return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4); |
c906108c SS |
956 | else |
957 | #endif /* SYSCALL_TRAP */ | |
b5fc49aa | 958 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); |
c906108c SS |
959 | } |
960 | ||
152d9db6 GS |
961 | /* Function: m68k_gdbarch_init |
962 | Initializer function for the m68k gdbarch vector. | |
963 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
964 | ||
965 | static struct gdbarch * | |
966 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
967 | { | |
a2c6a6d5 GS |
968 | static LONGEST call_dummy_words[7] = { 0xf227e0ff, 0x48e7fffc, 0x426742e7, |
969 | 0x4eb93232, 0x3232dffc, 0x69696969, | |
970 | (0x4e404e71 | (BPT_VECTOR << 16)) | |
971 | }; | |
152d9db6 GS |
972 | struct gdbarch_tdep *tdep = NULL; |
973 | struct gdbarch *gdbarch; | |
974 | ||
975 | /* find a candidate among the list of pre-declared architectures. */ | |
976 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
977 | if (arches != NULL) | |
978 | return (arches->gdbarch); | |
979 | ||
980 | #if 0 | |
981 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
982 | #endif | |
6300c360 | 983 | |
152d9db6 GS |
984 | gdbarch = gdbarch_alloc (&info, 0); |
985 | ||
5d3ed2e3 GS |
986 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
987 | set_gdbarch_long_double_bit (gdbarch, 96); | |
988 | ||
989 | set_gdbarch_function_start_offset (gdbarch, 0); | |
990 | ||
991 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); | |
992 | set_gdbarch_saved_pc_after_call (gdbarch, m68k_saved_pc_after_call); | |
103a1597 | 993 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
994 | |
995 | /* Stack grows down. */ | |
996 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
997 | set_gdbarch_stack_align (gdbarch, m68k_stack_align); | |
998 | ||
6300c360 GS |
999 | |
1000 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 GS |
1001 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
1002 | ||
1003 | set_gdbarch_store_struct_return (gdbarch, m68k_store_struct_return); | |
1004 | set_gdbarch_deprecated_extract_return_value (gdbarch, | |
1005 | m68k_deprecated_extract_return_value); | |
ebba8386 | 1006 | set_gdbarch_deprecated_store_return_value (gdbarch, m68k_store_return_value); |
942dc0e9 GS |
1007 | |
1008 | set_gdbarch_frame_chain (gdbarch, m68k_frame_chain); | |
6300c360 | 1009 | set_gdbarch_frame_chain_valid (gdbarch, generic_func_frame_chain_valid); |
942dc0e9 GS |
1010 | set_gdbarch_frame_saved_pc (gdbarch, m68k_frame_saved_pc); |
1011 | set_gdbarch_frame_init_saved_regs (gdbarch, m68k_frame_init_saved_regs); | |
1012 | set_gdbarch_frameless_function_invocation (gdbarch, | |
1013 | m68k_frameless_function_invocation); | |
6300c360 GS |
1014 | /* OK to default this value to 'unknown'. */ |
1015 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); | |
1016 | set_gdbarch_frame_args_skip (gdbarch, 8); | |
942dc0e9 | 1017 | |
5d3ed2e3 GS |
1018 | set_gdbarch_register_raw_size (gdbarch, m68k_register_raw_size); |
1019 | set_gdbarch_register_virtual_size (gdbarch, m68k_register_virtual_size); | |
1020 | set_gdbarch_max_register_raw_size (gdbarch, 12); | |
1021 | set_gdbarch_max_register_virtual_size (gdbarch, 12); | |
1022 | set_gdbarch_register_virtual_type (gdbarch, m68k_register_virtual_type); | |
1023 | set_gdbarch_register_name (gdbarch, m68k_register_name); | |
1024 | set_gdbarch_register_size (gdbarch, 4); | |
1025 | set_gdbarch_register_byte (gdbarch, m68k_register_byte); | |
942dc0e9 GS |
1026 | set_gdbarch_num_regs (gdbarch, 29); |
1027 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); | |
1028 | set_gdbarch_register_bytes (gdbarch, (16 * 4 + 8 + 8 * 12 + 3 * 4)); | |
32eeb91a AS |
1029 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
1030 | set_gdbarch_fp_regnum (gdbarch, M68K_FP_REGNUM); | |
1031 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); | |
1032 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1033 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
a2c6a6d5 | 1034 | |
07555a72 | 1035 | set_gdbarch_deprecated_use_generic_dummy_frames (gdbarch, 0); |
7f8e7424 GS |
1036 | set_gdbarch_call_dummy_location (gdbarch, ON_STACK); |
1037 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); | |
a2c6a6d5 | 1038 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 24); |
ae45cd16 | 1039 | set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_on_stack); |
7f8e7424 GS |
1040 | set_gdbarch_call_dummy_p (gdbarch, 1); |
1041 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
1042 | set_gdbarch_call_dummy_length (gdbarch, 28); | |
1043 | set_gdbarch_call_dummy_start_offset (gdbarch, 12); | |
a2c6a6d5 | 1044 | |
7f8e7424 GS |
1045 | set_gdbarch_call_dummy_words (gdbarch, call_dummy_words); |
1046 | set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_words)); | |
1047 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
1048 | set_gdbarch_fix_call_dummy (gdbarch, m68k_fix_call_dummy); | |
1049 | set_gdbarch_push_dummy_frame (gdbarch, m68k_push_dummy_frame); | |
1050 | set_gdbarch_pop_frame (gdbarch, m68k_pop_frame); | |
a2c6a6d5 | 1051 | |
152d9db6 GS |
1052 | return gdbarch; |
1053 | } | |
1054 | ||
1055 | ||
1056 | static void | |
1057 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1058 | { | |
1059 | ||
1060 | } | |
2acceee2 | 1061 | |
c906108c | 1062 | void |
fba45db2 | 1063 | _initialize_m68k_tdep (void) |
c906108c | 1064 | { |
152d9db6 | 1065 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c SS |
1066 | tm_print_insn = print_insn_m68k; |
1067 | } |