Commit | Line | Data |
---|---|---|
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 | ||
c481dac7 AS |
238 | static int |
239 | m68k_use_struct_convention (int gcc_p, struct type *type) | |
240 | { | |
241 | enum struct_return struct_return; | |
242 | ||
243 | struct_return = gdbarch_tdep (current_gdbarch)->struct_return; | |
244 | return generic_use_struct_convention (struct_return == reg_struct_return, | |
245 | type); | |
246 | } | |
247 | ||
942dc0e9 GS |
248 | /* A function that tells us whether the function invocation represented |
249 | by fi does not have a frame on the stack associated with it. If it | |
250 | does not, FRAMELESS is set to 1, else 0. */ | |
251 | ||
252 | static int | |
253 | m68k_frameless_function_invocation (struct frame_info *fi) | |
254 | { | |
32eeb91a | 255 | if (get_frame_type (fi) == SIGTRAMP_FRAME) |
942dc0e9 GS |
256 | return 0; |
257 | else | |
258 | return frameless_look_for_prologue (fi); | |
259 | } | |
260 | ||
89c3b6d3 | 261 | int |
fba45db2 | 262 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 263 | { |
1bd54964 AC |
264 | if (name != NULL) |
265 | return strcmp (name, "_sigcode") == 0; | |
266 | else | |
267 | return 0; | |
89c3b6d3 PDM |
268 | } |
269 | ||
270 | CORE_ADDR | |
fba45db2 | 271 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
272 | { |
273 | /* we assume here that the only frameless functions are the system calls | |
274 | or other functions who do not put anything on the stack. */ | |
32eeb91a | 275 | if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
1e2330ba | 276 | return get_frame_base (frame_info) + 12; |
89c3b6d3 PDM |
277 | else if (frameless_look_for_prologue (frame_info)) |
278 | { | |
b5d78d39 | 279 | /* Check for an interrupted system call */ |
11c02a10 AC |
280 | if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME)) |
281 | return get_frame_base (get_next_frame (frame_info)) + 16; | |
b5d78d39 | 282 | else |
1e2330ba | 283 | return get_frame_base (frame_info) + 4; |
89c3b6d3 PDM |
284 | } |
285 | else | |
1e2330ba | 286 | return get_frame_base (frame_info); |
89c3b6d3 PDM |
287 | } |
288 | ||
289 | CORE_ADDR | |
fba45db2 | 290 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 | 291 | { |
b5fc49aa AS |
292 | return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
293 | + 4, 4); | |
89c3b6d3 PDM |
294 | } |
295 | ||
392a587b | 296 | int |
fba45db2 | 297 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
298 | { |
299 | int val; | |
8bedc050 | 300 | CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi); |
b5fc49aa | 301 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 302 | val = 0; |
c5aa993b | 303 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 304 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
305 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
306 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
307 | { |
308 | val = (insn >> 9) & 7; | |
309 | if (val == 0) | |
310 | val = 8; | |
311 | } | |
c5aa993b | 312 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
313 | val = read_memory_integer (pc + 2, 4); |
314 | val >>= 2; | |
315 | return val; | |
316 | } | |
317 | ||
8de307e0 AS |
318 | static CORE_ADDR |
319 | m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, | |
320 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, | |
321 | struct value **args, CORE_ADDR sp, int struct_return, | |
322 | CORE_ADDR struct_addr) | |
7f8e7424 | 323 | { |
8de307e0 AS |
324 | char buf[4]; |
325 | int i; | |
326 | ||
327 | /* Push arguments in reverse order. */ | |
328 | for (i = nargs - 1; i >= 0; i--) | |
329 | { | |
c481dac7 AS |
330 | struct type *value_type = VALUE_ENCLOSING_TYPE (args[i]); |
331 | int len = TYPE_LENGTH (value_type); | |
8de307e0 | 332 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
333 | int offset; |
334 | ||
335 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
336 | right aligned. */ | |
337 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
338 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
339 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
340 | && len > 4) | |
341 | offset = 0; | |
342 | else | |
343 | offset = container_len - len; | |
8de307e0 AS |
344 | sp -= container_len; |
345 | write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len); | |
346 | } | |
347 | ||
c481dac7 | 348 | /* Store struct value address. */ |
8de307e0 AS |
349 | if (struct_return) |
350 | { | |
8de307e0 | 351 | store_unsigned_integer (buf, 4, struct_addr); |
c481dac7 | 352 | regcache_cooked_write (regcache, M68K_A1_REGNUM, buf); |
8de307e0 AS |
353 | } |
354 | ||
355 | /* Store return address. */ | |
356 | sp -= 4; | |
357 | store_unsigned_integer (buf, 4, bp_addr); | |
358 | write_memory (sp, buf, 4); | |
359 | ||
360 | /* Finally, update the stack pointer... */ | |
361 | store_unsigned_integer (buf, 4, sp); | |
362 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
363 | ||
364 | /* ...and fake a frame pointer. */ | |
365 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
366 | ||
367 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
368 | frame's CFA. */ | |
369 | return sp + 8; | |
7f8e7424 | 370 | } |
8de307e0 AS |
371 | \f |
372 | struct m68k_frame_cache | |
373 | { | |
374 | /* Base address. */ | |
375 | CORE_ADDR base; | |
376 | CORE_ADDR sp_offset; | |
377 | CORE_ADDR pc; | |
7f8e7424 | 378 | |
8de307e0 AS |
379 | /* Saved registers. */ |
380 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
381 | CORE_ADDR saved_sp; | |
7f8e7424 | 382 | |
8de307e0 AS |
383 | /* Stack space reserved for local variables. */ |
384 | long locals; | |
385 | }; | |
c906108c | 386 | |
8de307e0 AS |
387 | /* Allocate and initialize a frame cache. */ |
388 | ||
389 | static struct m68k_frame_cache * | |
390 | m68k_alloc_frame_cache (void) | |
c906108c | 391 | { |
8de307e0 AS |
392 | struct m68k_frame_cache *cache; |
393 | int i; | |
c906108c | 394 | |
8de307e0 | 395 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 396 | |
8de307e0 AS |
397 | /* Base address. */ |
398 | cache->base = 0; | |
399 | cache->sp_offset = -4; | |
400 | cache->pc = 0; | |
c906108c | 401 | |
8de307e0 AS |
402 | /* Saved registers. We initialize these to -1 since zero is a valid |
403 | offset (that's where %fp is supposed to be stored). */ | |
404 | for (i = 0; i < M68K_NUM_REGS; i++) | |
405 | cache->saved_regs[i] = -1; | |
406 | ||
407 | /* Frameless until proven otherwise. */ | |
408 | cache->locals = -1; | |
409 | ||
410 | return cache; | |
c906108c SS |
411 | } |
412 | ||
8de307e0 AS |
413 | /* Check whether PC points at a code that sets up a new stack frame. |
414 | If so, it updates CACHE and returns the address of the first | |
415 | instruction after the sequence that sets removes the "hidden" | |
416 | argument from the stack or CURRENT_PC, whichever is smaller. | |
417 | Otherwise, return PC. */ | |
c906108c | 418 | |
8de307e0 AS |
419 | static CORE_ADDR |
420 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
421 | struct m68k_frame_cache *cache) | |
c906108c | 422 | { |
8de307e0 AS |
423 | int op; |
424 | ||
425 | if (pc >= current_pc) | |
426 | return current_pc; | |
c906108c | 427 | |
8de307e0 AS |
428 | op = read_memory_unsigned_integer (pc, 2); |
429 | ||
430 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 431 | { |
8de307e0 AS |
432 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
433 | cache->sp_offset += 4; | |
434 | if (op == P_LINKW_FP) | |
435 | { | |
436 | /* link.w %fp, #-N */ | |
437 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
438 | cache->locals = -read_memory_integer (pc + 2, 2); | |
439 | ||
440 | if (pc + 4 < current_pc && cache->locals == 0) | |
441 | { | |
442 | op = read_memory_unsigned_integer (pc + 4, 2); | |
443 | if (op == P_ADDAL_SP) | |
444 | { | |
445 | cache->locals = read_memory_integer (pc + 6, 4); | |
446 | return pc + 10; | |
447 | } | |
448 | } | |
449 | ||
450 | return pc + 4; | |
451 | } | |
452 | else if (op == P_LINKL_FP) | |
c906108c | 453 | { |
8de307e0 AS |
454 | /* link.l %fp, #-N */ |
455 | cache->locals = -read_memory_integer (pc + 2, 4); | |
456 | return pc + 6; | |
457 | } | |
458 | else | |
459 | { | |
460 | /* pea (%fp); movea.l %sp, %fp */ | |
461 | cache->locals = 0; | |
462 | ||
463 | if (pc + 2 < current_pc) | |
464 | { | |
465 | op = read_memory_unsigned_integer (pc + 2, 2); | |
466 | ||
467 | if (op == P_MOVEAL_SP_FP) | |
468 | { | |
469 | /* move.l %sp, %fp */ | |
470 | return pc + 4; | |
471 | } | |
472 | } | |
473 | ||
474 | return pc + 2; | |
c906108c SS |
475 | } |
476 | } | |
8de307e0 | 477 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 478 | { |
8de307e0 AS |
479 | /* subq.[wl] #N,%sp */ |
480 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
481 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
482 | if (pc + 2 < current_pc) | |
c906108c | 483 | { |
8de307e0 AS |
484 | op = read_memory_unsigned_integer (pc + 2, 2); |
485 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
486 | { | |
487 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
488 | return pc + 4; | |
489 | } | |
c906108c | 490 | } |
8de307e0 AS |
491 | return pc + 2; |
492 | } | |
493 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
494 | { | |
495 | /* adda.w #-N,%sp */ | |
496 | /* lea (-N,%sp),%sp */ | |
497 | cache->locals = -read_memory_integer (pc + 2, 2); | |
498 | return pc + 4; | |
c906108c | 499 | } |
8de307e0 | 500 | else if (op == P_ADDAL_SP) |
c906108c | 501 | { |
8de307e0 AS |
502 | /* adda.l #-N,%sp */ |
503 | cache->locals = -read_memory_integer (pc + 2, 4); | |
504 | return pc + 6; | |
c906108c | 505 | } |
8de307e0 AS |
506 | |
507 | return pc; | |
c906108c | 508 | } |
c5aa993b | 509 | |
8de307e0 AS |
510 | /* Check whether PC points at code that saves registers on the stack. |
511 | If so, it updates CACHE and returns the address of the first | |
512 | instruction after the register saves or CURRENT_PC, whichever is | |
513 | smaller. Otherwise, return PC. */ | |
c906108c | 514 | |
8de307e0 AS |
515 | static CORE_ADDR |
516 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
517 | struct m68k_frame_cache *cache) | |
518 | { | |
519 | if (cache->locals >= 0) | |
520 | { | |
521 | CORE_ADDR offset; | |
522 | int op; | |
523 | int i, mask, regno; | |
c906108c | 524 | |
8de307e0 AS |
525 | offset = -4 - cache->locals; |
526 | while (pc < current_pc) | |
527 | { | |
528 | op = read_memory_unsigned_integer (pc, 2); | |
529 | if (op == P_FMOVEMX_SP) | |
530 | { | |
531 | /* fmovem.x REGS,-(%sp) */ | |
532 | op = read_memory_unsigned_integer (pc + 2, 2); | |
533 | if ((op & 0xff00) == 0xe000) | |
534 | { | |
535 | mask = op & 0xff; | |
536 | for (i = 0; i < 16; i++, mask >>= 1) | |
537 | { | |
538 | if (mask & 1) | |
539 | { | |
540 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
541 | offset -= 12; | |
542 | } | |
543 | } | |
544 | pc += 4; | |
545 | } | |
546 | else | |
547 | break; | |
548 | } | |
549 | else if ((op & 0170677) == P_MOVEL_SP) | |
550 | { | |
551 | /* move.l %R,-(%sp) */ | |
552 | regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); | |
553 | cache->saved_regs[regno] = offset; | |
554 | offset -= 4; | |
555 | pc += 2; | |
556 | } | |
557 | else if (op == P_MOVEML_SP) | |
558 | { | |
559 | /* movem.l REGS,-(%sp) */ | |
560 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
561 | for (i = 0; i < 16; i++, mask >>= 1) | |
562 | { | |
563 | if (mask & 1) | |
564 | { | |
565 | cache->saved_regs[15 - i] = offset; | |
566 | offset -= 4; | |
567 | } | |
568 | } | |
569 | pc += 4; | |
570 | } | |
571 | else | |
572 | break; | |
573 | } | |
574 | } | |
575 | ||
576 | return pc; | |
577 | } | |
c906108c | 578 | |
c906108c | 579 | |
8de307e0 AS |
580 | /* Do a full analysis of the prologue at PC and update CACHE |
581 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
582 | address where the analysis stopped. | |
c906108c | 583 | |
8de307e0 | 584 | We handle all cases that can be generated by gcc. |
c906108c | 585 | |
8de307e0 | 586 | For allocating a stack frame: |
c906108c | 587 | |
8de307e0 AS |
588 | link.w %a6,#-N |
589 | link.l %a6,#-N | |
590 | pea (%fp); move.l %sp,%fp | |
591 | link.w %a6,#0; add.l #-N,%sp | |
592 | subq.l #N,%sp | |
593 | subq.w #N,%sp | |
594 | subq.w #8,%sp; subq.w #N-8,%sp | |
595 | add.w #-N,%sp | |
596 | lea (-N,%sp),%sp | |
597 | add.l #-N,%sp | |
c906108c | 598 | |
8de307e0 | 599 | For saving registers: |
c906108c | 600 | |
8de307e0 AS |
601 | fmovem.x REGS,-(%sp) |
602 | move.l R1,-(%sp) | |
603 | move.l R1,-(%sp); move.l R2,-(%sp) | |
604 | movem.l REGS,-(%sp) | |
c906108c | 605 | |
8de307e0 | 606 | For setting up the PIC register: |
c906108c | 607 | |
8de307e0 | 608 | lea (%pc,N),%a5 |
c906108c | 609 | |
8de307e0 | 610 | */ |
c906108c | 611 | |
eb2e12d7 | 612 | static CORE_ADDR |
8de307e0 AS |
613 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
614 | struct m68k_frame_cache *cache) | |
c906108c | 615 | { |
8de307e0 | 616 | unsigned int op; |
c906108c | 617 | |
8de307e0 AS |
618 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
619 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
620 | if (pc >= current_pc) | |
621 | return current_pc; | |
c906108c | 622 | |
8de307e0 AS |
623 | /* Check for GOT setup. */ |
624 | op = read_memory_unsigned_integer (pc, 4); | |
625 | if (op == P_LEA_PC_A5) | |
c906108c | 626 | { |
8de307e0 AS |
627 | /* lea (%pc,N),%a5 */ |
628 | return pc + 6; | |
c906108c | 629 | } |
8de307e0 AS |
630 | |
631 | return pc; | |
c906108c SS |
632 | } |
633 | ||
8de307e0 | 634 | /* Return PC of first real instruction. */ |
7f8e7424 | 635 | |
8de307e0 AS |
636 | static CORE_ADDR |
637 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 638 | { |
8de307e0 AS |
639 | struct m68k_frame_cache cache; |
640 | CORE_ADDR pc; | |
641 | int op; | |
c906108c | 642 | |
8de307e0 AS |
643 | cache.locals = -1; |
644 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
645 | if (cache.locals < 0) | |
646 | return start_pc; | |
647 | return pc; | |
648 | } | |
c906108c | 649 | |
8de307e0 AS |
650 | static CORE_ADDR |
651 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
652 | { | |
653 | char buf[8]; | |
7f8e7424 | 654 | |
8de307e0 AS |
655 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
656 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
657 | } | |
658 | \f | |
659 | /* Normal frames. */ | |
7f8e7424 | 660 | |
8de307e0 AS |
661 | static struct m68k_frame_cache * |
662 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
663 | { | |
664 | struct m68k_frame_cache *cache; | |
665 | char buf[4]; | |
666 | int i; | |
667 | ||
668 | if (*this_cache) | |
669 | return *this_cache; | |
670 | ||
671 | cache = m68k_alloc_frame_cache (); | |
672 | *this_cache = cache; | |
673 | ||
674 | /* In principle, for normal frames, %fp holds the frame pointer, | |
675 | which holds the base address for the current stack frame. | |
676 | However, for functions that don't need it, the frame pointer is | |
677 | optional. For these "frameless" functions the frame pointer is | |
678 | actually the frame pointer of the calling frame. Signal | |
679 | trampolines are just a special case of a "frameless" function. | |
680 | They (usually) share their frame pointer with the frame that was | |
681 | in progress when the signal occurred. */ | |
682 | ||
683 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
684 | cache->base = extract_unsigned_integer (buf, 4); | |
685 | if (cache->base == 0) | |
686 | return cache; | |
687 | ||
688 | /* For normal frames, %pc is stored at 4(%fp). */ | |
689 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
690 | ||
691 | cache->pc = frame_func_unwind (next_frame); | |
692 | if (cache->pc != 0) | |
693 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
694 | ||
695 | if (cache->locals < 0) | |
696 | { | |
697 | /* We didn't find a valid frame, which means that CACHE->base | |
698 | currently holds the frame pointer for our calling frame. If | |
699 | we're at the start of a function, or somewhere half-way its | |
700 | prologue, the function's frame probably hasn't been fully | |
701 | setup yet. Try to reconstruct the base address for the stack | |
702 | frame by looking at the stack pointer. For truly "frameless" | |
703 | functions this might work too. */ | |
704 | ||
705 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
706 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
707 | } | |
7f8e7424 | 708 | |
8de307e0 AS |
709 | /* Now that we have the base address for the stack frame we can |
710 | calculate the value of %sp in the calling frame. */ | |
711 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 712 | |
8de307e0 AS |
713 | /* Adjust all the saved registers such that they contain addresses |
714 | instead of offsets. */ | |
715 | for (i = 0; i < M68K_NUM_REGS; i++) | |
716 | if (cache->saved_regs[i] != -1) | |
717 | cache->saved_regs[i] += cache->base; | |
c906108c | 718 | |
8de307e0 AS |
719 | return cache; |
720 | } | |
c906108c | 721 | |
8de307e0 AS |
722 | static void |
723 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
724 | struct frame_id *this_id) | |
725 | { | |
726 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 727 | |
8de307e0 AS |
728 | /* This marks the outermost frame. */ |
729 | if (cache->base == 0) | |
730 | return; | |
c5aa993b | 731 | |
8de307e0 AS |
732 | /* See the end of m68k_push_dummy_call. */ |
733 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
734 | } | |
c5aa993b | 735 | |
8de307e0 AS |
736 | static void |
737 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
738 | int regnum, int *optimizedp, | |
739 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
740 | int *realnump, void *valuep) | |
741 | { | |
742 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
743 | ||
744 | gdb_assert (regnum >= 0); | |
745 | ||
746 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 747 | { |
8de307e0 AS |
748 | *optimizedp = 0; |
749 | *lvalp = not_lval; | |
750 | *addrp = 0; | |
751 | *realnump = -1; | |
752 | if (valuep) | |
c906108c | 753 | { |
8de307e0 AS |
754 | /* Store the value. */ |
755 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 756 | } |
8de307e0 AS |
757 | return; |
758 | } | |
759 | ||
760 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
761 | { | |
762 | *optimizedp = 0; | |
763 | *lvalp = lval_memory; | |
764 | *addrp = cache->saved_regs[regnum]; | |
765 | *realnump = -1; | |
766 | if (valuep) | |
89c3b6d3 | 767 | { |
8de307e0 AS |
768 | /* Read the value in from memory. */ |
769 | read_memory (*addrp, valuep, | |
770 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 771 | } |
8de307e0 | 772 | return; |
c906108c | 773 | } |
8de307e0 AS |
774 | |
775 | frame_register_unwind (next_frame, regnum, | |
776 | optimizedp, lvalp, addrp, realnump, valuep); | |
777 | } | |
778 | ||
779 | static const struct frame_unwind m68k_frame_unwind = | |
780 | { | |
781 | NORMAL_FRAME, | |
782 | m68k_frame_this_id, | |
783 | m68k_frame_prev_register | |
784 | }; | |
785 | ||
786 | static const struct frame_unwind * | |
336d1bba | 787 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
788 | { |
789 | return &m68k_frame_unwind; | |
790 | } | |
791 | \f | |
792 | /* Signal trampolines. */ | |
793 | ||
794 | static struct m68k_frame_cache * | |
795 | m68k_sigtramp_frame_cache (struct frame_info *next_frame, void **this_cache) | |
796 | { | |
797 | struct m68k_frame_cache *cache; | |
798 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
799 | struct m68k_sigtramp_info info; | |
800 | char buf[4]; | |
801 | int i; | |
802 | ||
803 | if (*this_cache) | |
804 | return *this_cache; | |
805 | ||
806 | cache = m68k_alloc_frame_cache (); | |
807 | ||
808 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
809 | cache->base = extract_unsigned_integer (buf, 4) - 4; | |
810 | ||
811 | info = tdep->get_sigtramp_info (next_frame); | |
812 | ||
813 | for (i = 0; i < M68K_NUM_REGS; i++) | |
814 | if (info.sc_reg_offset[i] != -1) | |
815 | cache->saved_regs[i] = info.sigcontext_addr + info.sc_reg_offset[i]; | |
816 | ||
817 | *this_cache = cache; | |
818 | return cache; | |
819 | } | |
820 | ||
821 | static void | |
822 | m68k_sigtramp_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
823 | struct frame_id *this_id) | |
824 | { | |
825 | struct m68k_frame_cache *cache = | |
826 | m68k_sigtramp_frame_cache (next_frame, this_cache); | |
827 | ||
828 | /* See the end of m68k_push_dummy_call. */ | |
829 | *this_id = frame_id_build (cache->base + 8, frame_pc_unwind (next_frame)); | |
830 | } | |
831 | ||
832 | static void | |
833 | m68k_sigtramp_frame_prev_register (struct frame_info *next_frame, | |
834 | void **this_cache, | |
835 | int regnum, int *optimizedp, | |
836 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
837 | int *realnump, void *valuep) | |
838 | { | |
839 | /* Make sure we've initialized the cache. */ | |
840 | m68k_sigtramp_frame_cache (next_frame, this_cache); | |
841 | ||
842 | m68k_frame_prev_register (next_frame, this_cache, regnum, | |
843 | optimizedp, lvalp, addrp, realnump, valuep); | |
844 | } | |
845 | ||
846 | static const struct frame_unwind m68k_sigtramp_frame_unwind = | |
847 | { | |
848 | SIGTRAMP_FRAME, | |
849 | m68k_sigtramp_frame_this_id, | |
850 | m68k_sigtramp_frame_prev_register | |
851 | }; | |
852 | ||
853 | static const struct frame_unwind * | |
336d1bba | 854 | m68k_sigtramp_frame_sniffer (struct frame_info *next_frame) |
8de307e0 | 855 | { |
336d1bba | 856 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
8de307e0 AS |
857 | char *name; |
858 | ||
859 | /* We shouldn't even bother to try if the OSABI didn't register | |
860 | a get_sigtramp_info handler. */ | |
861 | if (!gdbarch_tdep (current_gdbarch)->get_sigtramp_info) | |
862 | return NULL; | |
863 | ||
864 | find_pc_partial_function (pc, &name, NULL, NULL); | |
865 | if (PC_IN_SIGTRAMP (pc, name)) | |
866 | return &m68k_sigtramp_frame_unwind; | |
867 | ||
868 | return NULL; | |
c906108c | 869 | } |
8de307e0 AS |
870 | \f |
871 | static CORE_ADDR | |
872 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
873 | { | |
874 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
875 | ||
876 | return cache->base; | |
877 | } | |
878 | ||
879 | static const struct frame_base m68k_frame_base = | |
880 | { | |
881 | &m68k_frame_unwind, | |
882 | m68k_frame_base_address, | |
883 | m68k_frame_base_address, | |
884 | m68k_frame_base_address | |
885 | }; | |
886 | ||
887 | static struct frame_id | |
888 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
889 | { | |
890 | char buf[4]; | |
891 | CORE_ADDR fp; | |
c906108c | 892 | |
8de307e0 AS |
893 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
894 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 895 | |
8de307e0 AS |
896 | /* See the end of m68k_push_dummy_call. */ |
897 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
898 | } | |
899 | \f | |
c5aa993b | 900 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
901 | |
902 | #include <sys/procfs.h> | |
903 | ||
c60c0f5f MS |
904 | /* Prototypes for supply_gregset etc. */ |
905 | #include "gregset.h" | |
906 | ||
c906108c | 907 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
908 | two different sets, the general register set (gregset) and the floating |
909 | point register set (fpregset). For each set, there is an ioctl to get | |
910 | the current register set and another ioctl to set the current values. | |
c906108c | 911 | |
c5aa993b JM |
912 | The actual structure passed through the ioctl interface is, of course, |
913 | naturally machine dependent, and is different for each set of registers. | |
914 | For the m68k for example, the general register set is typically defined | |
915 | by: | |
c906108c | 916 | |
c5aa993b | 917 | typedef int gregset_t[18]; |
c906108c | 918 | |
c5aa993b JM |
919 | #define R_D0 0 |
920 | ... | |
921 | #define R_PS 17 | |
c906108c | 922 | |
c5aa993b | 923 | and the floating point set by: |
c906108c | 924 | |
c5aa993b JM |
925 | typedef struct fpregset { |
926 | int f_pcr; | |
927 | int f_psr; | |
928 | int f_fpiaddr; | |
929 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
930 | } fpregset_t; | |
c906108c | 931 | |
c5aa993b JM |
932 | These routines provide the packing and unpacking of gregset_t and |
933 | fpregset_t formatted data. | |
c906108c SS |
934 | |
935 | */ | |
936 | ||
937 | /* Atari SVR4 has R_SR but not R_PS */ | |
938 | ||
939 | #if !defined (R_PS) && defined (R_SR) | |
940 | #define R_PS R_SR | |
941 | #endif | |
942 | ||
943 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
944 | unpack the register contents and supply them as gdb's idea of the current |
945 | register values. */ | |
c906108c SS |
946 | |
947 | void | |
fba45db2 | 948 | supply_gregset (gregset_t *gregsetp) |
c906108c SS |
949 | { |
950 | register int regi; | |
951 | register greg_t *regp = (greg_t *) gregsetp; | |
952 | ||
c5aa993b | 953 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
954 | { |
955 | supply_register (regi, (char *) (regp + regi)); | |
956 | } | |
957 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
958 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
959 | } | |
960 | ||
961 | void | |
fba45db2 | 962 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c SS |
963 | { |
964 | register int regi; | |
965 | register greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 966 | |
c5aa993b | 967 | for (regi = 0; regi < R_PC; regi++) |
c906108c | 968 | { |
8de307e0 AS |
969 | if (regno == -1 || regno == regi) |
970 | regcache_collect (regi, regp + regi); | |
c906108c | 971 | } |
8de307e0 AS |
972 | if (regno == -1 || regno == PS_REGNUM) |
973 | regcache_collect (PS_REGNUM, regp + R_PS); | |
974 | if (regno == -1 || regno == PC_REGNUM) | |
975 | regcache_collect (PC_REGNUM, regp + R_PC); | |
c906108c SS |
976 | } |
977 | ||
978 | #if defined (FP0_REGNUM) | |
979 | ||
980 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
981 | (fpregset_t *), unpack the register contents and supply them as gdb's |
982 | idea of the current floating point register values. */ | |
c906108c | 983 | |
c5aa993b | 984 | void |
fba45db2 | 985 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c SS |
986 | { |
987 | register int regi; | |
988 | char *from; | |
c5aa993b | 989 | |
32eeb91a | 990 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 991 | { |
c5aa993b | 992 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
993 | supply_register (regi, from); |
994 | } | |
32eeb91a AS |
995 | supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
996 | supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
997 | supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
998 | } |
999 | ||
1000 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
1001 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
1002 | of the current floating point register set. If REGNO is -1, update | |
1003 | them all. */ | |
c906108c SS |
1004 | |
1005 | void | |
fba45db2 | 1006 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
1007 | { |
1008 | int regi; | |
c906108c | 1009 | |
32eeb91a | 1010 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 1011 | { |
8de307e0 AS |
1012 | if (regno == -1 || regno == regi) |
1013 | regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); | |
c906108c | 1014 | } |
8de307e0 AS |
1015 | if (regno == -1 || regno == M68K_FPC_REGNUM) |
1016 | regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr); | |
1017 | if (regno == -1 || regno == M68K_FPS_REGNUM) | |
1018 | regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr); | |
1019 | if (regno == -1 || regno == M68K_FPI_REGNUM) | |
1020 | regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr); | |
c906108c SS |
1021 | } |
1022 | ||
c5aa993b | 1023 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 1024 | |
c5aa993b | 1025 | #endif /* USE_PROC_FS */ |
c906108c | 1026 | |
c906108c SS |
1027 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1028 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1029 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
1030 | This routine returns true on success. */ | |
1031 | ||
1032 | int | |
f4281f55 | 1033 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 1034 | { |
35fc8285 | 1035 | char *buf; |
c906108c | 1036 | CORE_ADDR sp, jb_addr; |
eb2e12d7 AS |
1037 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
1038 | ||
1039 | if (tdep->jb_pc < 0) | |
1040 | { | |
1041 | internal_error (__FILE__, __LINE__, | |
1042 | "m68k_get_longjmp_target: not implemented"); | |
1043 | return 0; | |
1044 | } | |
c906108c | 1045 | |
35fc8285 | 1046 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 1047 | sp = read_register (SP_REGNUM); |
c906108c | 1048 | |
b5d78d39 GS |
1049 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
1050 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
1051 | return 0; |
1052 | ||
7c0b4a20 | 1053 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c | 1054 | |
eb2e12d7 | 1055 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c906108c SS |
1056 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
1057 | return 0; | |
1058 | ||
7c0b4a20 | 1059 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
1060 | return 1; |
1061 | } | |
c906108c | 1062 | |
8de307e0 | 1063 | #ifdef SYSCALL_TRAP |
c906108c SS |
1064 | /* Immediately after a function call, return the saved pc before the frame |
1065 | is setup. For sun3's, we check for the common case of being inside of a | |
1066 | system call, and if so, we know that Sun pushes the call # on the stack | |
1067 | prior to doing the trap. */ | |
1068 | ||
eb2e12d7 | 1069 | static CORE_ADDR |
fba45db2 | 1070 | m68k_saved_pc_after_call (struct frame_info *frame) |
c906108c | 1071 | { |
c906108c SS |
1072 | int op; |
1073 | ||
b5fc49aa | 1074 | op = read_memory_unsigned_integer (frame->pc - SYSCALL_TRAP_OFFSET, 2); |
c906108c SS |
1075 | |
1076 | if (op == SYSCALL_TRAP) | |
b5fc49aa | 1077 | return read_memory_unsigned_integer (read_register (SP_REGNUM) + 4, 4); |
c906108c | 1078 | else |
b5fc49aa | 1079 | return read_memory_unsigned_integer (read_register (SP_REGNUM), 4); |
c906108c | 1080 | } |
8de307e0 | 1081 | #endif /* SYSCALL_TRAP */ |
c906108c | 1082 | |
152d9db6 GS |
1083 | /* Function: m68k_gdbarch_init |
1084 | Initializer function for the m68k gdbarch vector. | |
1085 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1086 | ||
1087 | static struct gdbarch * | |
1088 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1089 | { | |
1090 | struct gdbarch_tdep *tdep = NULL; | |
1091 | struct gdbarch *gdbarch; | |
1092 | ||
1093 | /* find a candidate among the list of pre-declared architectures. */ | |
1094 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1095 | if (arches != NULL) | |
1096 | return (arches->gdbarch); | |
1097 | ||
eb2e12d7 AS |
1098 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1099 | gdbarch = gdbarch_alloc (&info, tdep); | |
152d9db6 | 1100 | |
5d3ed2e3 GS |
1101 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
1102 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1103 | ||
1104 | set_gdbarch_function_start_offset (gdbarch, 0); | |
1105 | ||
1106 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); | |
8de307e0 | 1107 | #ifdef SYSCALL_TRAP |
6913c89a | 1108 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, m68k_saved_pc_after_call); |
8de307e0 | 1109 | #endif |
103a1597 | 1110 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1111 | |
1112 | /* Stack grows down. */ | |
1113 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
78bf922a | 1114 | set_gdbarch_parm_boundary (gdbarch, 32); |
6300c360 GS |
1115 | |
1116 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 GS |
1117 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
1118 | ||
8de307e0 AS |
1119 | set_gdbarch_extract_return_value (gdbarch, m68k_extract_return_value); |
1120 | set_gdbarch_store_return_value (gdbarch, m68k_store_return_value); | |
1121 | set_gdbarch_extract_struct_value_address (gdbarch, | |
1122 | m68k_extract_struct_value_address); | |
c481dac7 | 1123 | set_gdbarch_use_struct_convention (gdbarch, m68k_use_struct_convention); |
942dc0e9 | 1124 | |
942dc0e9 GS |
1125 | set_gdbarch_frameless_function_invocation (gdbarch, |
1126 | m68k_frameless_function_invocation); | |
6300c360 | 1127 | set_gdbarch_frame_args_skip (gdbarch, 8); |
942dc0e9 | 1128 | |
8de307e0 | 1129 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1130 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
942dc0e9 GS |
1131 | set_gdbarch_num_regs (gdbarch, 29); |
1132 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); | |
32eeb91a | 1133 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1134 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1135 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1136 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
a2c6a6d5 | 1137 | |
8de307e0 | 1138 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
6c0e89ed | 1139 | |
650fcc91 AS |
1140 | /* Disassembler. */ |
1141 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1142 | ||
eb2e12d7 AS |
1143 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1144 | tdep->jb_pc = JB_PC; | |
1145 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1146 | #else | |
1147 | tdep->jb_pc = -1; | |
1148 | #endif | |
8de307e0 | 1149 | tdep->get_sigtramp_info = NULL; |
c481dac7 | 1150 | tdep->struct_return = pcc_struct_return; |
8de307e0 AS |
1151 | |
1152 | /* Frame unwinder. */ | |
1153 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1154 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
1155 | frame_base_set_default (gdbarch, &m68k_frame_base); | |
eb2e12d7 | 1156 | |
55809acb AS |
1157 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1158 | gdbarch_init_osabi (info, gdbarch); | |
1159 | ||
eb2e12d7 AS |
1160 | /* Now we have tuned the configuration, set a few final things, |
1161 | based on what the OS ABI has told us. */ | |
1162 | ||
1163 | if (tdep->jb_pc >= 0) | |
1164 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1165 | ||
336d1bba AC |
1166 | frame_unwind_append_sniffer (gdbarch, m68k_sigtramp_frame_sniffer); |
1167 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); | |
8de307e0 | 1168 | |
152d9db6 GS |
1169 | return gdbarch; |
1170 | } | |
1171 | ||
1172 | ||
1173 | static void | |
1174 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1175 | { | |
eb2e12d7 | 1176 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1177 | |
eb2e12d7 AS |
1178 | if (tdep == NULL) |
1179 | return; | |
152d9db6 | 1180 | } |
2acceee2 | 1181 | |
a78f21af AC |
1182 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1183 | ||
c906108c | 1184 | void |
fba45db2 | 1185 | _initialize_m68k_tdep (void) |
c906108c | 1186 | { |
152d9db6 | 1187 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1188 | } |