Commit | Line | Data |
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c906108c | 1 | /* Target dependent code for the Motorola 68000 series. |
51603483 DJ |
2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001, |
3 | 2002, 2003 | |
a1de33a8 | 4 | 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" | |
24 | #include "frame.h" | |
8de307e0 AS |
25 | #include "frame-base.h" |
26 | #include "frame-unwind.h" | |
c906108c SS |
27 | #include "symtab.h" |
28 | #include "gdbcore.h" | |
29 | #include "value.h" | |
30 | #include "gdb_string.h" | |
8de307e0 | 31 | #include "gdb_assert.h" |
7a292a7a | 32 | #include "inferior.h" |
4e052eda | 33 | #include "regcache.h" |
5d3ed2e3 | 34 | #include "arch-utils.h" |
55809acb | 35 | #include "osabi.h" |
32eeb91a AS |
36 | |
37 | #include "m68k-tdep.h" | |
c906108c | 38 | \f |
c5aa993b | 39 | |
89c3b6d3 PDM |
40 | #define P_LINKL_FP 0x480e |
41 | #define P_LINKW_FP 0x4e56 | |
42 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
43 | #define P_MOVEAL_SP_FP 0x2c4f |
44 | #define P_ADDAW_SP 0xdefc | |
45 | #define P_ADDAL_SP 0xdffc | |
46 | #define P_SUBQW_SP 0x514f | |
47 | #define P_SUBQL_SP 0x518f | |
48 | #define P_LEA_SP_SP 0x4fef | |
49 | #define P_LEA_PC_A5 0x4bfb0170 | |
50 | #define P_FMOVEMX_SP 0xf227 | |
51 | #define P_MOVEL_SP 0x2f00 | |
52 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 53 | |
103a1597 | 54 | |
103a1597 GS |
55 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
56 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
57 | ||
103a1597 | 58 | /* Offset from SP to first arg on stack at first instruction of a function */ |
103a1597 GS |
59 | #define SP_ARG0 (1 * 4) |
60 | ||
103a1597 GS |
61 | #if !defined (BPT_VECTOR) |
62 | #define BPT_VECTOR 0xf | |
63 | #endif | |
64 | ||
65 | #if !defined (REMOTE_BPT_VECTOR) | |
66 | #define REMOTE_BPT_VECTOR 1 | |
67 | #endif | |
68 | ||
69 | ||
103a1597 GS |
70 | /* gdbarch_breakpoint_from_pc is set to m68k_local_breakpoint_from_pc |
71 | so m68k_remote_breakpoint_from_pc is currently not used. */ | |
72 | ||
eb2e12d7 | 73 | static const unsigned char * |
103a1597 GS |
74 | m68k_remote_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
75 | { | |
76 | static unsigned char break_insn[] = {0x4e, (0x40 | REMOTE_BPT_VECTOR)}; | |
77 | *lenptr = sizeof (break_insn); | |
78 | return break_insn; | |
79 | } | |
80 | ||
eb2e12d7 | 81 | static const unsigned char * |
103a1597 GS |
82 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
83 | { | |
84 | static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; | |
85 | *lenptr = sizeof (break_insn); | |
86 | return break_insn; | |
87 | } | |
88 | ||
89 | ||
942dc0e9 | 90 | static int |
5ae5f592 | 91 | m68k_register_bytes_ok (long numbytes) |
942dc0e9 GS |
92 | { |
93 | return ((numbytes == REGISTER_BYTES_FP) | |
94 | || (numbytes == REGISTER_BYTES_NOFP)); | |
95 | } | |
96 | ||
d85fe7f7 AS |
97 | /* Return the GDB type object for the "standard" data type of data in |
98 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
99 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
100 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
101 | addresses return pointer to void, not pointer to char, because we | |
102 | don't want to attempt to print the string after printing the | |
103 | address. */ | |
5d3ed2e3 GS |
104 | |
105 | static struct type * | |
8de307e0 | 106 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 107 | { |
03dac896 AS |
108 | if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
109 | return builtin_type_m68881_ext; | |
110 | ||
32eeb91a | 111 | if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
03dac896 AS |
112 | return builtin_type_void_func_ptr; |
113 | ||
32eeb91a AS |
114 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
115 | || regnum == PS_REGNUM) | |
03dac896 AS |
116 | return builtin_type_int32; |
117 | ||
32eeb91a | 118 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
119 | return builtin_type_void_data_ptr; |
120 | ||
121 | return builtin_type_int32; | |
5d3ed2e3 GS |
122 | } |
123 | ||
124 | /* Function: m68k_register_name | |
125 | Returns the name of the standard m68k register regnum. */ | |
126 | ||
127 | static const char * | |
128 | m68k_register_name (int regnum) | |
129 | { | |
130 | static char *register_names[] = { | |
131 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
132 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
133 | "ps", "pc", | |
134 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
135 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" | |
136 | }; | |
137 | ||
138 | if (regnum < 0 || | |
139 | regnum >= sizeof (register_names) / sizeof (register_names[0])) | |
140 | internal_error (__FILE__, __LINE__, | |
141 | "m68k_register_name: illegal register number %d", regnum); | |
142 | else | |
143 | return register_names[regnum]; | |
144 | } | |
145 | ||
5d3ed2e3 GS |
146 | /* Index within `registers' of the first byte of the space for |
147 | register regnum. */ | |
148 | ||
149 | static int | |
150 | m68k_register_byte (int regnum) | |
151 | { | |
32eeb91a AS |
152 | if (regnum >= M68K_FPC_REGNUM) |
153 | return (((regnum - M68K_FPC_REGNUM) * 4) + 168); | |
5d3ed2e3 GS |
154 | else if (regnum >= FP0_REGNUM) |
155 | return (((regnum - FP0_REGNUM) * 12) + 72); | |
156 | else | |
157 | return (regnum * 4); | |
158 | } | |
8de307e0 AS |
159 | \f |
160 | /* Extract from an array REGBUF containing the (raw) register state, a | |
161 | function return value of TYPE, and copy that, in virtual format, | |
162 | into VALBUF. */ | |
942dc0e9 GS |
163 | |
164 | static void | |
8de307e0 AS |
165 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
166 | void *valbuf) | |
942dc0e9 | 167 | { |
8de307e0 AS |
168 | int len = TYPE_LENGTH (type); |
169 | char buf[M68K_MAX_REGISTER_SIZE]; | |
942dc0e9 | 170 | |
8de307e0 AS |
171 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
172 | && TYPE_NFIELDS (type) == 1) | |
173 | { | |
174 | m68k_extract_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); | |
175 | return; | |
176 | } | |
942dc0e9 | 177 | |
8de307e0 AS |
178 | if (len <= 4) |
179 | { | |
180 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
181 | memcpy (valbuf, buf + (4 - len), len); | |
182 | } | |
183 | else if (len <= 8) | |
184 | { | |
185 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
186 | memcpy (valbuf, buf + (8 - len), len - 4); | |
187 | regcache_raw_read (regcache, M68K_D1_REGNUM, | |
188 | (char *) valbuf + (len - 4)); | |
189 | } | |
190 | else | |
191 | internal_error (__FILE__, __LINE__, | |
192 | "Cannot extract return value of %d bytes long.", len); | |
942dc0e9 GS |
193 | } |
194 | ||
8de307e0 AS |
195 | /* Write into the appropriate registers a function return value stored |
196 | in VALBUF of type TYPE, given in virtual format. */ | |
942dc0e9 GS |
197 | |
198 | static void | |
8de307e0 AS |
199 | m68k_store_return_value (struct type *type, struct regcache *regcache, |
200 | const void *valbuf) | |
942dc0e9 | 201 | { |
8de307e0 | 202 | int len = TYPE_LENGTH (type); |
942dc0e9 | 203 | |
8de307e0 AS |
204 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
205 | && TYPE_NFIELDS (type) == 1) | |
206 | { | |
207 | m68k_store_return_value (TYPE_FIELD_TYPE (type, 0), regcache, valbuf); | |
208 | return; | |
209 | } | |
942dc0e9 | 210 | |
8de307e0 AS |
211 | if (len <= 4) |
212 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
213 | else if (len <= 8) | |
214 | { | |
215 | regcache_raw_write_part (regcache, M68K_D1_REGNUM, 8 - len, | |
216 | len - 4, valbuf); | |
217 | regcache_raw_write (regcache, M68K_D0_REGNUM, | |
218 | (char *) valbuf + (len - 4)); | |
219 | } | |
220 | else | |
221 | internal_error (__FILE__, __LINE__, | |
222 | "Cannot store return value of %d bytes long.", len); | |
223 | } | |
942dc0e9 | 224 | |
8de307e0 AS |
225 | /* Extract from REGCACHE, which contains the (raw) register state, the |
226 | address in which a function should return its structure value, as a | |
227 | CORE_ADDR. */ | |
942dc0e9 GS |
228 | |
229 | static CORE_ADDR | |
8de307e0 | 230 | m68k_extract_struct_value_address (struct regcache *regcache) |
942dc0e9 | 231 | { |
8de307e0 AS |
232 | char buf[4]; |
233 | ||
234 | regcache_cooked_read (regcache, M68K_D0_REGNUM, buf); | |
235 | return extract_unsigned_integer (buf, 4); | |
942dc0e9 GS |
236 | } |
237 | ||
238 | /* A function that tells us whether the function invocation represented | |
239 | by fi does not have a frame on the stack associated with it. If it | |
240 | does not, FRAMELESS is set to 1, else 0. */ | |
241 | ||
242 | static int | |
243 | m68k_frameless_function_invocation (struct frame_info *fi) | |
244 | { | |
32eeb91a | 245 | if (get_frame_type (fi) == SIGTRAMP_FRAME) |
942dc0e9 GS |
246 | return 0; |
247 | else | |
248 | return frameless_look_for_prologue (fi); | |
249 | } | |
250 | ||
89c3b6d3 | 251 | int |
fba45db2 | 252 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 253 | { |
1bd54964 AC |
254 | if (name != NULL) |
255 | return strcmp (name, "_sigcode") == 0; | |
256 | else | |
257 | return 0; | |
89c3b6d3 PDM |
258 | } |
259 | ||
260 | CORE_ADDR | |
fba45db2 | 261 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
262 | { |
263 | /* we assume here that the only frameless functions are the system calls | |
264 | or other functions who do not put anything on the stack. */ | |
32eeb91a | 265 | if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
1e2330ba | 266 | return get_frame_base (frame_info) + 12; |
89c3b6d3 PDM |
267 | else if (frameless_look_for_prologue (frame_info)) |
268 | { | |
b5d78d39 | 269 | /* Check for an interrupted system call */ |
11c02a10 AC |
270 | if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME)) |
271 | return get_frame_base (get_next_frame (frame_info)) + 16; | |
b5d78d39 | 272 | else |
1e2330ba | 273 | return get_frame_base (frame_info) + 4; |
89c3b6d3 PDM |
274 | } |
275 | else | |
1e2330ba | 276 | return get_frame_base (frame_info); |
89c3b6d3 PDM |
277 | } |
278 | ||
279 | CORE_ADDR | |
fba45db2 | 280 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 | 281 | { |
b5fc49aa AS |
282 | return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
283 | + 4, 4); | |
89c3b6d3 PDM |
284 | } |
285 | ||
392a587b | 286 | int |
fba45db2 | 287 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
288 | { |
289 | int val; | |
8bedc050 | 290 | CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi); |
b5fc49aa | 291 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 292 | val = 0; |
c5aa993b | 293 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 294 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
295 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
296 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
297 | { |
298 | val = (insn >> 9) & 7; | |
299 | if (val == 0) | |
300 | val = 8; | |
301 | } | |
c5aa993b | 302 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
303 | val = read_memory_integer (pc + 2, 4); |
304 | val >>= 2; | |
305 | return val; | |
306 | } | |
307 | ||
8de307e0 AS |
308 | static CORE_ADDR |
309 | m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, | |
310 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, | |
311 | struct value **args, CORE_ADDR sp, int struct_return, | |
312 | CORE_ADDR struct_addr) | |
7f8e7424 | 313 | { |
8de307e0 AS |
314 | char buf[4]; |
315 | int i; | |
316 | ||
317 | /* Push arguments in reverse order. */ | |
318 | for (i = nargs - 1; i >= 0; i--) | |
319 | { | |
320 | int len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (args[i])); | |
321 | int container_len = (len + 3) & ~3; | |
322 | int offset = container_len - len; | |
323 | ||
324 | sp -= container_len; | |
325 | write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len); | |
326 | } | |
327 | ||
328 | /* Push value address. */ | |
329 | if (struct_return) | |
330 | { | |
331 | sp -= 4; | |
332 | store_unsigned_integer (buf, 4, struct_addr); | |
333 | write_memory (sp, buf, 4); | |
334 | } | |
335 | ||
336 | /* Store return address. */ | |
337 | sp -= 4; | |
338 | store_unsigned_integer (buf, 4, bp_addr); | |
339 | write_memory (sp, buf, 4); | |
340 | ||
341 | /* Finally, update the stack pointer... */ | |
342 | store_unsigned_integer (buf, 4, sp); | |
343 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
344 | ||
345 | /* ...and fake a frame pointer. */ | |
346 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
347 | ||
348 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
349 | frame's CFA. */ | |
350 | return sp + 8; | |
7f8e7424 | 351 | } |
8de307e0 AS |
352 | \f |
353 | struct m68k_frame_cache | |
354 | { | |
355 | /* Base address. */ | |
356 | CORE_ADDR base; | |
357 | CORE_ADDR sp_offset; | |
358 | CORE_ADDR pc; | |
7f8e7424 | 359 | |
8de307e0 AS |
360 | /* Saved registers. */ |
361 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
362 | CORE_ADDR saved_sp; | |
7f8e7424 | 363 | |
8de307e0 AS |
364 | /* Stack space reserved for local variables. */ |
365 | long locals; | |
366 | }; | |
c906108c | 367 | |
8de307e0 AS |
368 | /* Allocate and initialize a frame cache. */ |
369 | ||
370 | static struct m68k_frame_cache * | |
371 | m68k_alloc_frame_cache (void) | |
c906108c | 372 | { |
8de307e0 AS |
373 | struct m68k_frame_cache *cache; |
374 | int i; | |
c906108c | 375 | |
8de307e0 | 376 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 377 | |
8de307e0 AS |
378 | /* Base address. */ |
379 | cache->base = 0; | |
380 | cache->sp_offset = -4; | |
381 | cache->pc = 0; | |
c906108c | 382 | |
8de307e0 AS |
383 | /* Saved registers. We initialize these to -1 since zero is a valid |
384 | offset (that's where %fp is supposed to be stored). */ | |
385 | for (i = 0; i < M68K_NUM_REGS; i++) | |
386 | cache->saved_regs[i] = -1; | |
387 | ||
388 | /* Frameless until proven otherwise. */ | |
389 | cache->locals = -1; | |
390 | ||
391 | return cache; | |
c906108c SS |
392 | } |
393 | ||
8de307e0 AS |
394 | /* Check whether PC points at a code that sets up a new stack frame. |
395 | If so, it updates CACHE and returns the address of the first | |
396 | instruction after the sequence that sets removes the "hidden" | |
397 | argument from the stack or CURRENT_PC, whichever is smaller. | |
398 | Otherwise, return PC. */ | |
c906108c | 399 | |
8de307e0 AS |
400 | static CORE_ADDR |
401 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
402 | struct m68k_frame_cache *cache) | |
c906108c | 403 | { |
8de307e0 AS |
404 | int op; |
405 | ||
406 | if (pc >= current_pc) | |
407 | return current_pc; | |
c906108c | 408 | |
8de307e0 AS |
409 | op = read_memory_unsigned_integer (pc, 2); |
410 | ||
411 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 412 | { |
8de307e0 AS |
413 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
414 | cache->sp_offset += 4; | |
415 | if (op == P_LINKW_FP) | |
416 | { | |
417 | /* link.w %fp, #-N */ | |
418 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
419 | cache->locals = -read_memory_integer (pc + 2, 2); | |
420 | ||
421 | if (pc + 4 < current_pc && cache->locals == 0) | |
422 | { | |
423 | op = read_memory_unsigned_integer (pc + 4, 2); | |
424 | if (op == P_ADDAL_SP) | |
425 | { | |
426 | cache->locals = read_memory_integer (pc + 6, 4); | |
427 | return pc + 10; | |
428 | } | |
429 | } | |
430 | ||
431 | return pc + 4; | |
432 | } | |
433 | else if (op == P_LINKL_FP) | |
c906108c | 434 | { |
8de307e0 AS |
435 | /* link.l %fp, #-N */ |
436 | cache->locals = -read_memory_integer (pc + 2, 4); | |
437 | return pc + 6; | |
438 | } | |
439 | else | |
440 | { | |
441 | /* pea (%fp); movea.l %sp, %fp */ | |
442 | cache->locals = 0; | |
443 | ||
444 | if (pc + 2 < current_pc) | |
445 | { | |
446 | op = read_memory_unsigned_integer (pc + 2, 2); | |
447 | ||
448 | if (op == P_MOVEAL_SP_FP) | |
449 | { | |
450 | /* move.l %sp, %fp */ | |
451 | return pc + 4; | |
452 | } | |
453 | } | |
454 | ||
455 | return pc + 2; | |
c906108c SS |
456 | } |
457 | } | |
8de307e0 | 458 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 459 | { |
8de307e0 AS |
460 | /* subq.[wl] #N,%sp */ |
461 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
462 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
463 | if (pc + 2 < current_pc) | |
c906108c | 464 | { |
8de307e0 AS |
465 | op = read_memory_unsigned_integer (pc + 2, 2); |
466 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
467 | { | |
468 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
469 | return pc + 4; | |
470 | } | |
c906108c | 471 | } |
8de307e0 AS |
472 | return pc + 2; |
473 | } | |
474 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
475 | { | |
476 | /* adda.w #-N,%sp */ | |
477 | /* lea (-N,%sp),%sp */ | |
478 | cache->locals = -read_memory_integer (pc + 2, 2); | |
479 | return pc + 4; | |
c906108c | 480 | } |
8de307e0 | 481 | else if (op == P_ADDAL_SP) |
c906108c | 482 | { |
8de307e0 AS |
483 | /* adda.l #-N,%sp */ |
484 | cache->locals = -read_memory_integer (pc + 2, 4); | |
485 | return pc + 6; | |
c906108c | 486 | } |
8de307e0 AS |
487 | |
488 | return pc; | |
c906108c | 489 | } |
c5aa993b | 490 | |
8de307e0 AS |
491 | /* Check whether PC points at code that saves registers on the stack. |
492 | If so, it updates CACHE and returns the address of the first | |
493 | instruction after the register saves or CURRENT_PC, whichever is | |
494 | smaller. Otherwise, return PC. */ | |
c906108c | 495 | |
8de307e0 AS |
496 | static CORE_ADDR |
497 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
498 | struct m68k_frame_cache *cache) | |
499 | { | |
500 | if (cache->locals >= 0) | |
501 | { | |
502 | CORE_ADDR offset; | |
503 | int op; | |
504 | int i, mask, regno; | |
c906108c | 505 | |
8de307e0 AS |
506 | offset = -4 - cache->locals; |
507 | while (pc < current_pc) | |
508 | { | |
509 | op = read_memory_unsigned_integer (pc, 2); | |
510 | if (op == P_FMOVEMX_SP) | |
511 | { | |
512 | /* fmovem.x REGS,-(%sp) */ | |
513 | op = read_memory_unsigned_integer (pc + 2, 2); | |
514 | if ((op & 0xff00) == 0xe000) | |
515 | { | |
516 | mask = op & 0xff; | |
517 | for (i = 0; i < 16; i++, mask >>= 1) | |
518 | { | |
519 | if (mask & 1) | |
520 | { | |
521 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
522 | offset -= 12; | |
523 | } | |
524 | } | |
525 | pc += 4; | |
526 | } | |
527 | else | |
528 | break; | |
529 | } | |
530 | else if ((op & 0170677) == P_MOVEL_SP) | |
531 | { | |
532 | /* move.l %R,-(%sp) */ | |
533 | regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); | |
534 | cache->saved_regs[regno] = offset; | |
535 | offset -= 4; | |
536 | pc += 2; | |
537 | } | |
538 | else if (op == P_MOVEML_SP) | |
539 | { | |
540 | /* movem.l REGS,-(%sp) */ | |
541 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
542 | for (i = 0; i < 16; i++, mask >>= 1) | |
543 | { | |
544 | if (mask & 1) | |
545 | { | |
546 | cache->saved_regs[15 - i] = offset; | |
547 | offset -= 4; | |
548 | } | |
549 | } | |
550 | pc += 4; | |
551 | } | |
552 | else | |
553 | break; | |
554 | } | |
555 | } | |
556 | ||
557 | return pc; | |
558 | } | |
c906108c | 559 | |
c906108c | 560 | |
8de307e0 AS |
561 | /* Do a full analysis of the prologue at PC and update CACHE |
562 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
563 | address where the analysis stopped. | |
c906108c | 564 | |
8de307e0 | 565 | We handle all cases that can be generated by gcc. |
c906108c | 566 | |
8de307e0 | 567 | For allocating a stack frame: |
c906108c | 568 | |
8de307e0 AS |
569 | link.w %a6,#-N |
570 | link.l %a6,#-N | |
571 | pea (%fp); move.l %sp,%fp | |
572 | link.w %a6,#0; add.l #-N,%sp | |
573 | subq.l #N,%sp | |
574 | subq.w #N,%sp | |
575 | subq.w #8,%sp; subq.w #N-8,%sp | |
576 | add.w #-N,%sp | |
577 | lea (-N,%sp),%sp | |
578 | add.l #-N,%sp | |
c906108c | 579 | |
8de307e0 | 580 | For saving registers: |
c906108c | 581 | |
8de307e0 AS |
582 | fmovem.x REGS,-(%sp) |
583 | move.l R1,-(%sp) | |
584 | move.l R1,-(%sp); move.l R2,-(%sp) | |
585 | movem.l REGS,-(%sp) | |
c906108c | 586 | |
8de307e0 | 587 | For setting up the PIC register: |
c906108c | 588 | |
8de307e0 | 589 | lea (%pc,N),%a5 |
c906108c | 590 | |
8de307e0 | 591 | */ |
c906108c | 592 | |
eb2e12d7 | 593 | static CORE_ADDR |
8de307e0 AS |
594 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
595 | struct m68k_frame_cache *cache) | |
c906108c | 596 | { |
8de307e0 | 597 | unsigned int op; |
c906108c | 598 | |
8de307e0 AS |
599 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
600 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
601 | if (pc >= current_pc) | |
602 | return current_pc; | |
c906108c | 603 | |
8de307e0 AS |
604 | /* Check for GOT setup. */ |
605 | op = read_memory_unsigned_integer (pc, 4); | |
606 | if (op == P_LEA_PC_A5) | |
c906108c | 607 | { |
8de307e0 AS |
608 | /* lea (%pc,N),%a5 */ |
609 | return pc + 6; | |
c906108c | 610 | } |
8de307e0 AS |
611 | |
612 | return pc; | |
c906108c SS |
613 | } |
614 | ||
8de307e0 | 615 | /* Return PC of first real instruction. */ |
7f8e7424 | 616 | |
8de307e0 AS |
617 | static CORE_ADDR |
618 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 619 | { |
8de307e0 AS |
620 | struct m68k_frame_cache cache; |
621 | CORE_ADDR pc; | |
622 | int op; | |
c906108c | 623 | |
8de307e0 AS |
624 | cache.locals = -1; |
625 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
626 | if (cache.locals < 0) | |
627 | return start_pc; | |
628 | return pc; | |
629 | } | |
c906108c | 630 | |
8de307e0 AS |
631 | static CORE_ADDR |
632 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
633 | { | |
634 | char buf[8]; | |
7f8e7424 | 635 | |
8de307e0 AS |
636 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
637 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
638 | } | |
639 | \f | |
640 | /* Normal frames. */ | |
7f8e7424 | 641 | |
8de307e0 AS |
642 | static struct m68k_frame_cache * |
643 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
644 | { | |
645 | struct m68k_frame_cache *cache; | |
646 | char buf[4]; | |
647 | int i; | |
648 | ||
649 | if (*this_cache) | |
650 | return *this_cache; | |
651 | ||
652 | cache = m68k_alloc_frame_cache (); | |
653 | *this_cache = cache; | |
654 | ||
655 | /* In principle, for normal frames, %fp holds the frame pointer, | |
656 | which holds the base address for the current stack frame. | |
657 | However, for functions that don't need it, the frame pointer is | |
658 | optional. For these "frameless" functions the frame pointer is | |
659 | actually the frame pointer of the calling frame. Signal | |
660 | trampolines are just a special case of a "frameless" function. | |
661 | They (usually) share their frame pointer with the frame that was | |
662 | in progress when the signal occurred. */ | |
663 | ||
664 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
665 | cache->base = extract_unsigned_integer (buf, 4); | |
666 | if (cache->base == 0) | |
667 | return cache; | |
668 | ||
669 | /* For normal frames, %pc is stored at 4(%fp). */ | |
670 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
671 | ||
672 | cache->pc = frame_func_unwind (next_frame); | |
673 | if (cache->pc != 0) | |
674 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
675 | ||
676 | if (cache->locals < 0) | |
677 | { | |
678 | /* We didn't find a valid frame, which means that CACHE->base | |
679 | currently holds the frame pointer for our calling frame. If | |
680 | we're at the start of a function, or somewhere half-way its | |
681 | prologue, the function's frame probably hasn't been fully | |
682 | setup yet. Try to reconstruct the base address for the stack | |
683 | frame by looking at the stack pointer. For truly "frameless" | |
684 | functions this might work too. */ | |
685 | ||
686 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
687 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
688 | } | |
7f8e7424 | 689 | |
8de307e0 AS |
690 | /* Now that we have the base address for the stack frame we can |
691 | calculate the value of %sp in the calling frame. */ | |
692 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 693 | |
8de307e0 AS |
694 | /* Adjust all the saved registers such that they contain addresses |
695 | instead of offsets. */ | |
696 | for (i = 0; i < M68K_NUM_REGS; i++) | |
697 | if (cache->saved_regs[i] != -1) | |
698 | cache->saved_regs[i] += cache->base; | |
c906108c | 699 | |
8de307e0 AS |
700 | return cache; |
701 | } | |
c906108c | 702 | |
8de307e0 AS |
703 | static void |
704 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
705 | struct frame_id *this_id) | |
706 | { | |
707 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 708 | |
8de307e0 AS |
709 | /* This marks the outermost frame. */ |
710 | if (cache->base == 0) | |
711 | return; | |
c5aa993b | 712 | |
8de307e0 AS |
713 | /* See the end of m68k_push_dummy_call. */ |
714 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
715 | } | |
c5aa993b | 716 | |
8de307e0 AS |
717 | static void |
718 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
719 | int regnum, int *optimizedp, | |
720 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
721 | int *realnump, void *valuep) | |
722 | { | |
723 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
724 | ||
725 | gdb_assert (regnum >= 0); | |
726 | ||
727 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 728 | { |
8de307e0 AS |
729 | *optimizedp = 0; |
730 | *lvalp = not_lval; | |
731 | *addrp = 0; | |
732 | *realnump = -1; | |
733 | if (valuep) | |
c906108c | 734 | { |
8de307e0 AS |
735 | /* Store the value. */ |
736 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 737 | } |
8de307e0 AS |
738 | return; |
739 | } | |
740 | ||
741 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
742 | { | |
743 | *optimizedp = 0; | |
744 | *lvalp = lval_memory; | |
745 | *addrp = cache->saved_regs[regnum]; | |
746 | *realnump = -1; | |
747 | if (valuep) | |
89c3b6d3 | 748 | { |
8de307e0 AS |
749 | /* Read the value in from memory. */ |
750 | read_memory (*addrp, valuep, | |
751 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 752 | } |
8de307e0 | 753 | return; |
c906108c | 754 | } |
8de307e0 AS |
755 | |
756 | frame_register_unwind (next_frame, regnum, | |
757 | optimizedp, lvalp, addrp, realnump, valuep); | |
758 | } | |
759 | ||
760 | static const struct frame_unwind m68k_frame_unwind = | |
761 | { | |
762 | NORMAL_FRAME, | |
763 | m68k_frame_this_id, | |
764 | m68k_frame_prev_register | |
765 | }; | |
766 | ||
767 | static const struct frame_unwind * | |
768 | m68k_frame_p (CORE_ADDR pc) | |
769 | { | |
770 | return &m68k_frame_unwind; | |
771 | } | |
772 | \f | |
773 | /* Signal trampolines. */ | |
774 | ||
775 | static struct m68k_frame_cache * | |
776 | m68k_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache) | |
777 | { | |
778 | struct m68k_frame_cache *cache; | |
779 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
780 | struct m68k_sigtramp_info info; | |
781 | char buf[4]; | |
782 | int i; | |
783 | ||
784 | if (*this_cache) | |
785 | return *this_cache; | |
786 | ||
787 | cache = m68k_alloc_frame_cache (); | |
788 | ||
789 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
790 | cache->base = extract_unsigned_integer (buf, 4) - 4; | |
791 | ||
792 | info = tdep->get_sigtramp_info (next_frame); | |
793 | ||
794 | for (i = 0; i < M68K_NUM_REGS; i++) | |
795 | if (info.sc_reg_offset[i] != -1) | |
796 | cache->saved_regs[i] = info.sigcontext_addr + info.sc_reg_offset[i]; | |
797 | ||
798 | *this_cache = cache; | |
799 | return cache; | |
800 | } | |
801 | ||
802 | static void | |
803 | m68k_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
804 | struct frame_id *this_id) | |
805 | { | |
806 | struct m68k_frame_cache *cache = | |
807 | m68k_sigtramp_frame_cache (next_frame, this_cache); | |
808 | ||
809 | /* See the end of m68k_push_dummy_call. */ | |
810 | *this_id = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame)); | |
811 | } | |
812 | ||
813 | static void | |
814 | m68k_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
815 | void **this_cache, | |
816 | int regnum, int *optimizedp, | |
817 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
818 | int *realnump, void *valuep) | |
819 | { | |
820 | /* Make sure we've initialized the cache. */ | |
821 | m68k_sigtramp_frame_cache (next_frame, this_cache); | |
822 | ||
823 | m68k_frame_prev_register (next_frame, this_cache, regnum, | |
824 | optimizedp, lvalp, addrp, realnump, valuep); | |
825 | } | |
826 | ||
827 | static const struct frame_unwind m68k_sigtramp_frame_unwind = | |
828 | { | |
829 | SIGTRAMP_FRAME, | |
830 | m68k_sigtramp_frame_this_id, | |
831 | m68k_sigtramp_frame_prev_register | |
832 | }; | |
833 | ||
834 | static const struct frame_unwind * | |
835 | m68k_sigtramp_frame_p (CORE_ADDR pc) | |
836 | { | |
837 | char *name; | |
838 | ||
839 | /* We shouldn't even bother to try if the OSABI didn't register | |
840 | a get_sigtramp_info handler. */ | |
841 | if (!gdbarch_tdep (current_gdbarch)->get_sigtramp_info) | |
842 | return NULL; | |
843 | ||
844 | find_pc_partial_function (pc, &name, NULL, NULL); | |
845 | if (PC_IN_SIGTRAMP (pc, name)) | |
846 | return &m68k_sigtramp_frame_unwind; | |
847 | ||
848 | return NULL; | |
c906108c | 849 | } |
8de307e0 AS |
850 | \f |
851 | static CORE_ADDR | |
852 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
853 | { | |
854 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
855 | ||
856 | return cache->base; | |
857 | } | |
858 | ||
859 | static const struct frame_base m68k_frame_base = | |
860 | { | |
861 | &m68k_frame_unwind, | |
862 | m68k_frame_base_address, | |
863 | m68k_frame_base_address, | |
864 | m68k_frame_base_address | |
865 | }; | |
866 | ||
867 | static struct frame_id | |
868 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
869 | { | |
870 | char buf[4]; | |
871 | CORE_ADDR fp; | |
c906108c | 872 | |
8de307e0 AS |
873 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
874 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 875 | |
8de307e0 AS |
876 | /* See the end of m68k_push_dummy_call. */ |
877 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
878 | } | |
879 | \f | |
c5aa993b | 880 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
881 | |
882 | #include <sys/procfs.h> | |
883 | ||
c60c0f5f MS |
884 | /* Prototypes for supply_gregset etc. */ |
885 | #include "gregset.h" | |
886 | ||
c906108c | 887 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
888 | two different sets, the general register set (gregset) and the floating |
889 | point register set (fpregset). For each set, there is an ioctl to get | |
890 | the current register set and another ioctl to set the current values. | |
c906108c | 891 | |
c5aa993b JM |
892 | The actual structure passed through the ioctl interface is, of course, |
893 | naturally machine dependent, and is different for each set of registers. | |
894 | For the m68k for example, the general register set is typically defined | |
895 | by: | |
c906108c | 896 | |
c5aa993b | 897 | typedef int gregset_t[18]; |
c906108c | 898 | |
c5aa993b JM |
899 | #define R_D0 0 |
900 | ... | |
901 | #define R_PS 17 | |
c906108c | 902 | |
c5aa993b | 903 | and the floating point set by: |
c906108c | 904 | |
c5aa993b JM |
905 | typedef struct fpregset { |
906 | int f_pcr; | |
907 | int f_psr; | |
908 | int f_fpiaddr; | |
909 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
910 | } fpregset_t; | |
c906108c | 911 | |
c5aa993b JM |
912 | These routines provide the packing and unpacking of gregset_t and |
913 | fpregset_t formatted data. | |
c906108c SS |
914 | |
915 | */ | |
916 | ||
917 | /* Atari SVR4 has R_SR but not R_PS */ | |
918 | ||
919 | #if !defined (R_PS) && defined (R_SR) | |
920 | #define R_PS R_SR | |
921 | #endif | |
922 | ||
923 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
924 | unpack the register contents and supply them as gdb's idea of the current |
925 | register values. */ | |
c906108c SS |
926 | |
927 | void | |
fba45db2 | 928 | supply_gregset (gregset_t *gregsetp) |
c906108c SS |
929 | { |
930 | register int regi; | |
931 | register greg_t *regp = (greg_t *) gregsetp; | |
932 | ||
c5aa993b | 933 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
934 | { |
935 | supply_register (regi, (char *) (regp + regi)); | |
936 | } | |
937 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
938 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
939 | } | |
940 | ||
941 | void | |
fba45db2 | 942 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c SS |
943 | { |
944 | register int regi; | |
945 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 946 | |
c5aa993b | 947 | for (regi = 0; regi < R_PC; regi++) |
c906108c | 948 | { |
8de307e0 AS |
949 | if (regno == -1 || regno == regi) |
950 | regcache_collect (regi, regp + regi); | |
c906108c | 951 | } |
8de307e0 AS |
952 | if (regno == -1 || regno == PS_REGNUM) |
953 | regcache_collect (PS_REGNUM, regp + R_PS); | |
954 | if (regno == -1 || regno == PC_REGNUM) | |
955 | regcache_collect (PC_REGNUM, regp + R_PC); | |
c906108c SS |
956 | } |
957 | ||
958 | #if defined (FP0_REGNUM) | |
959 | ||
960 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
961 | (fpregset_t *), unpack the register contents and supply them as gdb's |
962 | idea of the current floating point register values. */ | |
c906108c | 963 | |
c5aa993b | 964 | void |
fba45db2 | 965 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c SS |
966 | { |
967 | register int regi; | |
968 | char *from; | |
c5aa993b | 969 | |
32eeb91a | 970 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 971 | { |
c5aa993b | 972 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
973 | supply_register (regi, from); |
974 | } | |
32eeb91a AS |
975 | supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
976 | supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
977 | supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
978 | } |
979 | ||
980 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
981 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
982 | of the current floating point register set. If REGNO is -1, update | |
983 | them all. */ | |
c906108c SS |
984 | |
985 | void | |
fba45db2 | 986 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
987 | { |
988 | int regi; | |
c906108c | 989 | |
32eeb91a | 990 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 991 | { |
8de307e0 AS |
992 | if (regno == -1 || regno == regi) |
993 | regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); | |
c906108c | 994 | } |
8de307e0 AS |
995 | if (regno == -1 || regno == M68K_FPC_REGNUM) |
996 | regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr); | |
997 | if (regno == -1 || regno == M68K_FPS_REGNUM) | |
998 | regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr); | |
999 | if (regno == -1 || regno == M68K_FPI_REGNUM) | |
1000 | regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr); | |
c906108c SS |
1001 | } |
1002 | ||
c5aa993b | 1003 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 1004 | |
c5aa993b | 1005 | #endif /* USE_PROC_FS */ |
c906108c | 1006 | |
c906108c SS |
1007 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1008 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1009 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
1010 | This routine returns true on success. */ | |
1011 | ||
1012 | int | |
f4281f55 | 1013 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 1014 | { |
35fc8285 | 1015 | char *buf; |
c906108c | 1016 | CORE_ADDR sp, jb_addr; |
eb2e12d7 AS |
1017 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
1018 | ||
1019 | if (tdep->jb_pc < 0) | |
1020 | { | |
1021 | internal_error (__FILE__, __LINE__, | |
1022 | "m68k_get_longjmp_target: not implemented"); | |
1023 | return 0; | |
1024 | } | |
c906108c | 1025 | |
35fc8285 | 1026 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 1027 | sp = read_register (SP_REGNUM); |
c906108c | 1028 | |
b5d78d39 GS |
1029 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
1030 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
1031 | return 0; |
1032 | ||
7c0b4a20 | 1033 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c | 1034 | |
eb2e12d7 | 1035 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c906108c SS |
1036 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
1037 | return 0; | |
1038 | ||
7c0b4a20 | 1039 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
1040 | return 1; |
1041 | } | |
c906108c | 1042 | |
8de307e0 | 1043 | #ifdef SYSCALL_TRAP |
c906108c SS |
1044 | /* Immediately after a function call, return the saved pc before the frame |
1045 | is setup. For sun3's, we check for the common case of being inside of a | |
1046 | system call, and if so, we know that Sun pushes the call # on the stack | |
1047 | prior to doing the trap. */ | |
1048 | ||
eb2e12d7 | 1049 | static CORE_ADDR |
fba45db2 | 1050 | m68k_saved_pc_after_call (struct frame_info *frame) |
c906108c | 1051 | { |
c906108c SS |
1052 | int op; |
1053 | ||
b5fc49aa | 1054 | op = read_memory_unsigned_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); |
c906108c SS |
1055 | |
1056 | if (op == SYSCALL_TRAP) | |
b5fc49aa | 1057 | return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4); |
c906108c | 1058 | else |
b5fc49aa | 1059 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); |
c906108c | 1060 | } |
8de307e0 | 1061 | #endif /* SYSCALL_TRAP */ |
c906108c | 1062 | |
152d9db6 GS |
1063 | /* Function: m68k_gdbarch_init |
1064 | Initializer function for the m68k gdbarch vector. | |
1065 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1066 | ||
1067 | static struct gdbarch * | |
1068 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1069 | { | |
1070 | struct gdbarch_tdep *tdep = NULL; | |
1071 | struct gdbarch *gdbarch; | |
1072 | ||
1073 | /* find a candidate among the list of pre-declared architectures. */ | |
1074 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1075 | if (arches != NULL) | |
1076 | return (arches->gdbarch); | |
1077 | ||
eb2e12d7 AS |
1078 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1079 | gdbarch = gdbarch_alloc (&info, tdep); | |
152d9db6 | 1080 | |
5d3ed2e3 GS |
1081 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
1082 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1083 | ||
1084 | set_gdbarch_function_start_offset (gdbarch, 0); | |
1085 | ||
1086 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); | |
8de307e0 | 1087 | #ifdef SYSCALL_TRAP |
6913c89a | 1088 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, m68k_saved_pc_after_call); |
8de307e0 | 1089 | #endif |
103a1597 | 1090 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1091 | |
1092 | /* Stack grows down. */ | |
1093 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
78bf922a | 1094 | set_gdbarch_parm_boundary (gdbarch, 32); |
6300c360 GS |
1095 | |
1096 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 GS |
1097 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
1098 | ||
8de307e0 AS |
1099 | set_gdbarch_extract_return_value (gdbarch, m68k_extract_return_value); |
1100 | set_gdbarch_store_return_value (gdbarch, m68k_store_return_value); | |
1101 | set_gdbarch_extract_struct_value_address (gdbarch, | |
1102 | m68k_extract_struct_value_address); | |
942dc0e9 | 1103 | |
942dc0e9 GS |
1104 | set_gdbarch_frameless_function_invocation (gdbarch, |
1105 | m68k_frameless_function_invocation); | |
6300c360 | 1106 | set_gdbarch_frame_args_skip (gdbarch, 8); |
942dc0e9 | 1107 | |
8de307e0 | 1108 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1109 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
942dc0e9 GS |
1110 | set_gdbarch_num_regs (gdbarch, 29); |
1111 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); | |
32eeb91a | 1112 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1113 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1114 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1115 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
a2c6a6d5 | 1116 | |
8de307e0 | 1117 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
6c0e89ed | 1118 | |
650fcc91 AS |
1119 | /* Disassembler. */ |
1120 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1121 | ||
eb2e12d7 AS |
1122 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1123 | tdep->jb_pc = JB_PC; | |
1124 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1125 | #else | |
1126 | tdep->jb_pc = -1; | |
1127 | #endif | |
8de307e0 AS |
1128 | tdep->get_sigtramp_info = NULL; |
1129 | ||
1130 | /* Frame unwinder. */ | |
1131 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1132 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
1133 | frame_base_set_default (gdbarch, &m68k_frame_base); | |
eb2e12d7 | 1134 | |
55809acb AS |
1135 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1136 | gdbarch_init_osabi (info, gdbarch); | |
1137 | ||
eb2e12d7 AS |
1138 | /* Now we have tuned the configuration, set a few final things, |
1139 | based on what the OS ABI has told us. */ | |
1140 | ||
1141 | if (tdep->jb_pc >= 0) | |
1142 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1143 | ||
8de307e0 AS |
1144 | frame_unwind_append_predicate (gdbarch, m68k_sigtramp_frame_p); |
1145 | frame_unwind_append_predicate (gdbarch, m68k_frame_p); | |
1146 | ||
152d9db6 GS |
1147 | return gdbarch; |
1148 | } | |
1149 | ||
1150 | ||
1151 | static void | |
1152 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1153 | { | |
eb2e12d7 | 1154 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1155 | |
eb2e12d7 AS |
1156 | if (tdep == NULL) |
1157 | return; | |
152d9db6 | 1158 | } |
2acceee2 | 1159 | |
a78f21af AC |
1160 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1161 | ||
c906108c | 1162 | void |
fba45db2 | 1163 | _initialize_m68k_tdep (void) |
c906108c | 1164 | { |
152d9db6 | 1165 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1166 | } |