Commit | Line | Data |
---|---|---|
748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b | 2 | |
6aba47ca DJ |
3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001, |
4 | 2002, 2003, 2004, 2005, 2006, 2007 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 | |
197e01b6 EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
3f244638 | 24 | #include "dwarf2-frame.h" |
c906108c | 25 | #include "frame.h" |
8de307e0 AS |
26 | #include "frame-base.h" |
27 | #include "frame-unwind.h" | |
e6bb342a | 28 | #include "gdbtypes.h" |
c906108c SS |
29 | #include "symtab.h" |
30 | #include "gdbcore.h" | |
31 | #include "value.h" | |
32 | #include "gdb_string.h" | |
8de307e0 | 33 | #include "gdb_assert.h" |
7a292a7a | 34 | #include "inferior.h" |
4e052eda | 35 | #include "regcache.h" |
5d3ed2e3 | 36 | #include "arch-utils.h" |
55809acb | 37 | #include "osabi.h" |
a89aa300 | 38 | #include "dis-asm.h" |
32eeb91a AS |
39 | |
40 | #include "m68k-tdep.h" | |
c906108c | 41 | \f |
c5aa993b | 42 | |
89c3b6d3 PDM |
43 | #define P_LINKL_FP 0x480e |
44 | #define P_LINKW_FP 0x4e56 | |
45 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
46 | #define P_MOVEAL_SP_FP 0x2c4f |
47 | #define P_ADDAW_SP 0xdefc | |
48 | #define P_ADDAL_SP 0xdffc | |
49 | #define P_SUBQW_SP 0x514f | |
50 | #define P_SUBQL_SP 0x518f | |
51 | #define P_LEA_SP_SP 0x4fef | |
52 | #define P_LEA_PC_A5 0x4bfb0170 | |
53 | #define P_FMOVEMX_SP 0xf227 | |
54 | #define P_MOVEL_SP 0x2f00 | |
55 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 56 | |
103a1597 | 57 | |
103a1597 GS |
58 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
59 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
60 | ||
103a1597 | 61 | /* Offset from SP to first arg on stack at first instruction of a function */ |
103a1597 GS |
62 | #define SP_ARG0 (1 * 4) |
63 | ||
103a1597 GS |
64 | #if !defined (BPT_VECTOR) |
65 | #define BPT_VECTOR 0xf | |
66 | #endif | |
67 | ||
f5cf7aa1 | 68 | static const gdb_byte * |
103a1597 GS |
69 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
70 | { | |
f5cf7aa1 | 71 | static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
103a1597 GS |
72 | *lenptr = sizeof (break_insn); |
73 | return break_insn; | |
74 | } | |
75 | ||
76 | ||
942dc0e9 | 77 | static int |
5ae5f592 | 78 | m68k_register_bytes_ok (long numbytes) |
942dc0e9 GS |
79 | { |
80 | return ((numbytes == REGISTER_BYTES_FP) | |
81 | || (numbytes == REGISTER_BYTES_NOFP)); | |
82 | } | |
83 | ||
d85fe7f7 AS |
84 | /* Return the GDB type object for the "standard" data type of data in |
85 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
86 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
87 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
88 | addresses return pointer to void, not pointer to char, because we | |
89 | don't want to attempt to print the string after printing the | |
90 | address. */ | |
5d3ed2e3 GS |
91 | |
92 | static struct type * | |
8de307e0 | 93 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 94 | { |
03dac896 AS |
95 | if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
96 | return builtin_type_m68881_ext; | |
97 | ||
32eeb91a | 98 | if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
03dac896 AS |
99 | return builtin_type_void_func_ptr; |
100 | ||
32eeb91a AS |
101 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
102 | || regnum == PS_REGNUM) | |
03dac896 AS |
103 | return builtin_type_int32; |
104 | ||
32eeb91a | 105 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
106 | return builtin_type_void_data_ptr; |
107 | ||
108 | return builtin_type_int32; | |
5d3ed2e3 GS |
109 | } |
110 | ||
111 | /* Function: m68k_register_name | |
112 | Returns the name of the standard m68k register regnum. */ | |
113 | ||
114 | static const char * | |
115 | m68k_register_name (int regnum) | |
116 | { | |
117 | static char *register_names[] = { | |
118 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
119 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
120 | "ps", "pc", | |
121 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
122 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" | |
123 | }; | |
124 | ||
07652652 | 125 | if (regnum < 0 || regnum >= ARRAY_SIZE (register_names)) |
5d3ed2e3 | 126 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 127 | _("m68k_register_name: illegal register number %d"), regnum); |
5d3ed2e3 GS |
128 | else |
129 | return register_names[regnum]; | |
130 | } | |
e47577ab MK |
131 | \f |
132 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
133 | needs any special handling. */ | |
134 | ||
135 | static int | |
136 | m68k_convert_register_p (int regnum, struct type *type) | |
137 | { | |
138 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7); | |
139 | } | |
140 | ||
141 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
142 | return its contents in TO. */ | |
143 | ||
144 | static void | |
145 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 146 | struct type *type, gdb_byte *to) |
e47577ab | 147 | { |
f5cf7aa1 | 148 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
e47577ab MK |
149 | |
150 | /* We only support floating-point values. */ | |
151 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
152 | { | |
8a3fe4f8 AC |
153 | warning (_("Cannot convert floating-point register value " |
154 | "to non-floating-point type.")); | |
e47577ab MK |
155 | return; |
156 | } | |
157 | ||
158 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to | |
159 | the extended floating-point format used by the FPU. */ | |
160 | get_frame_register (frame, regnum, from); | |
161 | convert_typed_floating (from, builtin_type_m68881_ext, to, type); | |
162 | } | |
163 | ||
164 | /* Write the contents FROM of a value of type TYPE into register | |
165 | REGNUM in frame FRAME. */ | |
166 | ||
167 | static void | |
168 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 169 | struct type *type, const gdb_byte *from) |
e47577ab | 170 | { |
f5cf7aa1 | 171 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
e47577ab MK |
172 | |
173 | /* We only support floating-point values. */ | |
174 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
175 | { | |
8a3fe4f8 AC |
176 | warning (_("Cannot convert non-floating-point type " |
177 | "to floating-point register value.")); | |
e47577ab MK |
178 | return; |
179 | } | |
180 | ||
181 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent | |
182 | to the extended floating-point format used by the FPU. */ | |
183 | convert_typed_floating (from, type, to, builtin_type_m68881_ext); | |
184 | put_frame_register (frame, regnum, to); | |
185 | } | |
186 | ||
8de307e0 | 187 | \f |
f595cb19 MK |
188 | /* There is a fair number of calling conventions that are in somewhat |
189 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
190 | coprocessor. All function return values are stored in %d0/%d1. | |
191 | Structures are returned in a static buffer, a pointer to which is | |
192 | returned in %d0. This means that functions returning a structure | |
193 | are not re-entrant. To avoid this problem some systems use a | |
194 | convention where the caller passes a pointer to a buffer in %a1 | |
195 | where the return values is to be stored. This convention is the | |
196 | default, and is implemented in the function m68k_return_value. | |
197 | ||
198 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
199 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
200 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
201 | psABI. Integer values are returned in %d0/%d1, pointer return | |
202 | values in %a0 and floating values in %fp0. When calling functions | |
203 | returning a structure the caller should pass a pointer to a buffer | |
204 | for the return value in %a0. This convention is implemented in the | |
205 | function m68k_svr4_return_value, and by appropriately setting the | |
206 | struct_value_regnum member of `struct gdbarch_tdep'. | |
207 | ||
208 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
209 | for passing the structure return value buffer. | |
210 | ||
211 | GCC can also generate code where small structures are returned in | |
212 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
213 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
214 | embedded systems. This convention is implemented by setting the | |
215 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
216 | ||
217 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 218 | into VALBUF. */ |
942dc0e9 GS |
219 | |
220 | static void | |
8de307e0 | 221 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 222 | gdb_byte *valbuf) |
942dc0e9 | 223 | { |
8de307e0 | 224 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 225 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 226 | |
8de307e0 AS |
227 | if (len <= 4) |
228 | { | |
229 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
230 | memcpy (valbuf, buf + (4 - len), len); | |
231 | } | |
232 | else if (len <= 8) | |
233 | { | |
234 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
235 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 236 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
237 | } |
238 | else | |
239 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 240 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
241 | } |
242 | ||
942dc0e9 | 243 | static void |
f595cb19 | 244 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 245 | gdb_byte *valbuf) |
942dc0e9 | 246 | { |
8de307e0 | 247 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 248 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 249 | |
f595cb19 | 250 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 251 | { |
f595cb19 MK |
252 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
253 | convert_typed_floating (buf, builtin_type_m68881_ext, valbuf, type); | |
8de307e0 | 254 | } |
f595cb19 MK |
255 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
256 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
257 | else | |
258 | m68k_extract_return_value (type, regcache, valbuf); | |
259 | } | |
260 | ||
261 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
262 | ||
263 | static void | |
264 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 265 | const gdb_byte *valbuf) |
f595cb19 MK |
266 | { |
267 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 268 | |
8de307e0 AS |
269 | if (len <= 4) |
270 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
271 | else if (len <= 8) | |
272 | { | |
f595cb19 | 273 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 274 | len - 4, valbuf); |
f5cf7aa1 | 275 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
276 | } |
277 | else | |
278 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 279 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 280 | } |
942dc0e9 | 281 | |
f595cb19 MK |
282 | static void |
283 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 284 | const gdb_byte *valbuf) |
942dc0e9 | 285 | { |
f595cb19 | 286 | int len = TYPE_LENGTH (type); |
8de307e0 | 287 | |
f595cb19 MK |
288 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
289 | { | |
f5cf7aa1 | 290 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
f595cb19 MK |
291 | convert_typed_floating (valbuf, type, buf, builtin_type_m68881_ext); |
292 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); | |
293 | } | |
294 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
295 | { | |
296 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
297 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
298 | } | |
299 | else | |
300 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
301 | } |
302 | ||
f595cb19 MK |
303 | /* Return non-zero if TYPE, which is assumed to be a structure or |
304 | union type, should be returned in registers for architecture | |
305 | GDBARCH. */ | |
306 | ||
c481dac7 | 307 | static int |
f595cb19 | 308 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 309 | { |
f595cb19 MK |
310 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
311 | enum type_code code = TYPE_CODE (type); | |
312 | int len = TYPE_LENGTH (type); | |
c481dac7 | 313 | |
f595cb19 MK |
314 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
315 | ||
316 | if (tdep->struct_return == pcc_struct_return) | |
317 | return 0; | |
318 | ||
319 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
320 | } |
321 | ||
f595cb19 MK |
322 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
323 | should be returned. If it is supposed to be returned in registers, | |
324 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
325 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
326 | from WRITEBUF into REGCACHE. */ | |
327 | ||
328 | static enum return_value_convention | |
329 | m68k_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
330 | struct regcache *regcache, gdb_byte *readbuf, |
331 | const gdb_byte *writebuf) | |
f595cb19 MK |
332 | { |
333 | enum type_code code = TYPE_CODE (type); | |
334 | ||
1c845060 MK |
335 | /* GCC returns a `long double' in memory too. */ |
336 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
337 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
338 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
339 | { | |
340 | /* The default on m68k is to return structures in static memory. | |
341 | Consequently a function must return the address where we can | |
342 | find the return value. */ | |
f595cb19 | 343 | |
1c845060 MK |
344 | if (readbuf) |
345 | { | |
346 | ULONGEST addr; | |
347 | ||
348 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
349 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
350 | } | |
351 | ||
352 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
353 | } | |
f595cb19 MK |
354 | |
355 | if (readbuf) | |
356 | m68k_extract_return_value (type, regcache, readbuf); | |
357 | if (writebuf) | |
358 | m68k_store_return_value (type, regcache, writebuf); | |
359 | ||
360 | return RETURN_VALUE_REGISTER_CONVENTION; | |
361 | } | |
362 | ||
363 | static enum return_value_convention | |
364 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
365 | struct regcache *regcache, gdb_byte *readbuf, |
366 | const gdb_byte *writebuf) | |
f595cb19 MK |
367 | { |
368 | enum type_code code = TYPE_CODE (type); | |
369 | ||
370 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
371 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
372 | { |
373 | /* The System V ABI says that: | |
374 | ||
375 | "A function returning a structure or union also sets %a0 to | |
376 | the value it finds in %a0. Thus when the caller receives | |
377 | control again, the address of the returned object resides in | |
378 | register %a0." | |
379 | ||
380 | So the ABI guarantees that we can always find the return | |
381 | value just after the function has returned. */ | |
382 | ||
383 | if (readbuf) | |
384 | { | |
385 | ULONGEST addr; | |
386 | ||
387 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
388 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
389 | } | |
390 | ||
391 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
392 | } | |
f595cb19 MK |
393 | |
394 | /* This special case is for structures consisting of a single | |
395 | `float' or `double' member. These structures are returned in | |
396 | %fp0. For these structures, we call ourselves recursively, | |
397 | changing TYPE into the type of the first member of the structure. | |
398 | Since that should work for all structures that have only one | |
399 | member, we don't bother to check the member's type here. */ | |
400 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
401 | { | |
402 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
403 | return m68k_svr4_return_value (gdbarch, type, regcache, | |
404 | readbuf, writebuf); | |
405 | } | |
406 | ||
407 | if (readbuf) | |
408 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
409 | if (writebuf) | |
410 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
411 | ||
412 | return RETURN_VALUE_REGISTER_CONVENTION; | |
413 | } | |
414 | \f | |
392a587b | 415 | |
9bb47d95 NS |
416 | /* Always align the frame to a 4-byte boundary. This is required on |
417 | coldfire and harmless on the rest. */ | |
418 | ||
419 | static CORE_ADDR | |
420 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
421 | { | |
422 | /* Align the stack to four bytes. */ | |
423 | return sp & ~3; | |
424 | } | |
425 | ||
8de307e0 | 426 | static CORE_ADDR |
7d9b040b | 427 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
428 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
429 | struct value **args, CORE_ADDR sp, int struct_return, | |
430 | CORE_ADDR struct_addr) | |
7f8e7424 | 431 | { |
f595cb19 | 432 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
f5cf7aa1 | 433 | gdb_byte buf[4]; |
8de307e0 AS |
434 | int i; |
435 | ||
436 | /* Push arguments in reverse order. */ | |
437 | for (i = nargs - 1; i >= 0; i--) | |
438 | { | |
4754a64e | 439 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 440 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 441 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
442 | int offset; |
443 | ||
444 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
445 | right aligned. */ | |
446 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
447 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
448 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
449 | && len > 4) | |
450 | offset = 0; | |
451 | else | |
452 | offset = container_len - len; | |
8de307e0 | 453 | sp -= container_len; |
46615f07 | 454 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
455 | } |
456 | ||
c481dac7 | 457 | /* Store struct value address. */ |
8de307e0 AS |
458 | if (struct_return) |
459 | { | |
8de307e0 | 460 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 461 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
462 | } |
463 | ||
464 | /* Store return address. */ | |
465 | sp -= 4; | |
466 | store_unsigned_integer (buf, 4, bp_addr); | |
467 | write_memory (sp, buf, 4); | |
468 | ||
469 | /* Finally, update the stack pointer... */ | |
470 | store_unsigned_integer (buf, 4, sp); | |
471 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
472 | ||
473 | /* ...and fake a frame pointer. */ | |
474 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
475 | ||
476 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
477 | frame's CFA. */ | |
478 | return sp + 8; | |
7f8e7424 | 479 | } |
6dd0fba6 NS |
480 | |
481 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
482 | ||
483 | static int | |
484 | m68k_dwarf_reg_to_regnum (int num) | |
485 | { | |
486 | if (num < 8) | |
487 | /* d0..7 */ | |
488 | return (num - 0) + M68K_D0_REGNUM; | |
489 | else if (num < 16) | |
490 | /* a0..7 */ | |
491 | return (num - 8) + M68K_A0_REGNUM; | |
492 | else if (num < 24) | |
493 | /* fp0..7 */ | |
494 | return (num - 16) + M68K_FP0_REGNUM; | |
495 | else if (num == 25) | |
496 | /* pc */ | |
497 | return M68K_PC_REGNUM; | |
498 | else | |
f57d151a UW |
499 | return gdbarch_num_regs (current_gdbarch) |
500 | + gdbarch_num_pseudo_regs (current_gdbarch); | |
6dd0fba6 NS |
501 | } |
502 | ||
8de307e0 AS |
503 | \f |
504 | struct m68k_frame_cache | |
505 | { | |
506 | /* Base address. */ | |
507 | CORE_ADDR base; | |
508 | CORE_ADDR sp_offset; | |
509 | CORE_ADDR pc; | |
7f8e7424 | 510 | |
8de307e0 AS |
511 | /* Saved registers. */ |
512 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
513 | CORE_ADDR saved_sp; | |
7f8e7424 | 514 | |
8de307e0 AS |
515 | /* Stack space reserved for local variables. */ |
516 | long locals; | |
517 | }; | |
c906108c | 518 | |
8de307e0 AS |
519 | /* Allocate and initialize a frame cache. */ |
520 | ||
521 | static struct m68k_frame_cache * | |
522 | m68k_alloc_frame_cache (void) | |
c906108c | 523 | { |
8de307e0 AS |
524 | struct m68k_frame_cache *cache; |
525 | int i; | |
c906108c | 526 | |
8de307e0 | 527 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 528 | |
8de307e0 AS |
529 | /* Base address. */ |
530 | cache->base = 0; | |
531 | cache->sp_offset = -4; | |
532 | cache->pc = 0; | |
c906108c | 533 | |
8de307e0 AS |
534 | /* Saved registers. We initialize these to -1 since zero is a valid |
535 | offset (that's where %fp is supposed to be stored). */ | |
536 | for (i = 0; i < M68K_NUM_REGS; i++) | |
537 | cache->saved_regs[i] = -1; | |
538 | ||
539 | /* Frameless until proven otherwise. */ | |
540 | cache->locals = -1; | |
541 | ||
542 | return cache; | |
c906108c SS |
543 | } |
544 | ||
8de307e0 AS |
545 | /* Check whether PC points at a code that sets up a new stack frame. |
546 | If so, it updates CACHE and returns the address of the first | |
547 | instruction after the sequence that sets removes the "hidden" | |
548 | argument from the stack or CURRENT_PC, whichever is smaller. | |
549 | Otherwise, return PC. */ | |
c906108c | 550 | |
8de307e0 AS |
551 | static CORE_ADDR |
552 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
553 | struct m68k_frame_cache *cache) | |
c906108c | 554 | { |
8de307e0 AS |
555 | int op; |
556 | ||
557 | if (pc >= current_pc) | |
558 | return current_pc; | |
c906108c | 559 | |
8de307e0 AS |
560 | op = read_memory_unsigned_integer (pc, 2); |
561 | ||
562 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 563 | { |
8de307e0 AS |
564 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
565 | cache->sp_offset += 4; | |
566 | if (op == P_LINKW_FP) | |
567 | { | |
568 | /* link.w %fp, #-N */ | |
569 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
570 | cache->locals = -read_memory_integer (pc + 2, 2); | |
571 | ||
572 | if (pc + 4 < current_pc && cache->locals == 0) | |
573 | { | |
574 | op = read_memory_unsigned_integer (pc + 4, 2); | |
575 | if (op == P_ADDAL_SP) | |
576 | { | |
577 | cache->locals = read_memory_integer (pc + 6, 4); | |
578 | return pc + 10; | |
579 | } | |
580 | } | |
581 | ||
582 | return pc + 4; | |
583 | } | |
584 | else if (op == P_LINKL_FP) | |
c906108c | 585 | { |
8de307e0 AS |
586 | /* link.l %fp, #-N */ |
587 | cache->locals = -read_memory_integer (pc + 2, 4); | |
588 | return pc + 6; | |
589 | } | |
590 | else | |
591 | { | |
592 | /* pea (%fp); movea.l %sp, %fp */ | |
593 | cache->locals = 0; | |
594 | ||
595 | if (pc + 2 < current_pc) | |
596 | { | |
597 | op = read_memory_unsigned_integer (pc + 2, 2); | |
598 | ||
599 | if (op == P_MOVEAL_SP_FP) | |
600 | { | |
601 | /* move.l %sp, %fp */ | |
602 | return pc + 4; | |
603 | } | |
604 | } | |
605 | ||
606 | return pc + 2; | |
c906108c SS |
607 | } |
608 | } | |
8de307e0 | 609 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 610 | { |
8de307e0 AS |
611 | /* subq.[wl] #N,%sp */ |
612 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
613 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
614 | if (pc + 2 < current_pc) | |
c906108c | 615 | { |
8de307e0 AS |
616 | op = read_memory_unsigned_integer (pc + 2, 2); |
617 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
618 | { | |
619 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
620 | return pc + 4; | |
621 | } | |
c906108c | 622 | } |
8de307e0 AS |
623 | return pc + 2; |
624 | } | |
625 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
626 | { | |
627 | /* adda.w #-N,%sp */ | |
628 | /* lea (-N,%sp),%sp */ | |
629 | cache->locals = -read_memory_integer (pc + 2, 2); | |
630 | return pc + 4; | |
c906108c | 631 | } |
8de307e0 | 632 | else if (op == P_ADDAL_SP) |
c906108c | 633 | { |
8de307e0 AS |
634 | /* adda.l #-N,%sp */ |
635 | cache->locals = -read_memory_integer (pc + 2, 4); | |
636 | return pc + 6; | |
c906108c | 637 | } |
8de307e0 AS |
638 | |
639 | return pc; | |
c906108c | 640 | } |
c5aa993b | 641 | |
8de307e0 AS |
642 | /* Check whether PC points at code that saves registers on the stack. |
643 | If so, it updates CACHE and returns the address of the first | |
644 | instruction after the register saves or CURRENT_PC, whichever is | |
645 | smaller. Otherwise, return PC. */ | |
c906108c | 646 | |
8de307e0 AS |
647 | static CORE_ADDR |
648 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
649 | struct m68k_frame_cache *cache) | |
650 | { | |
651 | if (cache->locals >= 0) | |
652 | { | |
653 | CORE_ADDR offset; | |
654 | int op; | |
655 | int i, mask, regno; | |
c906108c | 656 | |
8de307e0 AS |
657 | offset = -4 - cache->locals; |
658 | while (pc < current_pc) | |
659 | { | |
660 | op = read_memory_unsigned_integer (pc, 2); | |
661 | if (op == P_FMOVEMX_SP) | |
662 | { | |
663 | /* fmovem.x REGS,-(%sp) */ | |
664 | op = read_memory_unsigned_integer (pc + 2, 2); | |
665 | if ((op & 0xff00) == 0xe000) | |
666 | { | |
667 | mask = op & 0xff; | |
668 | for (i = 0; i < 16; i++, mask >>= 1) | |
669 | { | |
670 | if (mask & 1) | |
671 | { | |
672 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
673 | offset -= 12; | |
674 | } | |
675 | } | |
676 | pc += 4; | |
677 | } | |
678 | else | |
679 | break; | |
680 | } | |
0ba5a932 | 681 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
682 | { |
683 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 684 | regno = op & 017; |
8de307e0 AS |
685 | cache->saved_regs[regno] = offset; |
686 | offset -= 4; | |
687 | pc += 2; | |
688 | } | |
689 | else if (op == P_MOVEML_SP) | |
690 | { | |
691 | /* movem.l REGS,-(%sp) */ | |
692 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
693 | for (i = 0; i < 16; i++, mask >>= 1) | |
694 | { | |
695 | if (mask & 1) | |
696 | { | |
697 | cache->saved_regs[15 - i] = offset; | |
698 | offset -= 4; | |
699 | } | |
700 | } | |
701 | pc += 4; | |
702 | } | |
703 | else | |
704 | break; | |
705 | } | |
706 | } | |
707 | ||
708 | return pc; | |
709 | } | |
c906108c | 710 | |
c906108c | 711 | |
8de307e0 AS |
712 | /* Do a full analysis of the prologue at PC and update CACHE |
713 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
714 | address where the analysis stopped. | |
c906108c | 715 | |
8de307e0 | 716 | We handle all cases that can be generated by gcc. |
c906108c | 717 | |
8de307e0 | 718 | For allocating a stack frame: |
c906108c | 719 | |
8de307e0 AS |
720 | link.w %a6,#-N |
721 | link.l %a6,#-N | |
722 | pea (%fp); move.l %sp,%fp | |
723 | link.w %a6,#0; add.l #-N,%sp | |
724 | subq.l #N,%sp | |
725 | subq.w #N,%sp | |
726 | subq.w #8,%sp; subq.w #N-8,%sp | |
727 | add.w #-N,%sp | |
728 | lea (-N,%sp),%sp | |
729 | add.l #-N,%sp | |
c906108c | 730 | |
8de307e0 | 731 | For saving registers: |
c906108c | 732 | |
8de307e0 AS |
733 | fmovem.x REGS,-(%sp) |
734 | move.l R1,-(%sp) | |
735 | move.l R1,-(%sp); move.l R2,-(%sp) | |
736 | movem.l REGS,-(%sp) | |
c906108c | 737 | |
8de307e0 | 738 | For setting up the PIC register: |
c906108c | 739 | |
8de307e0 | 740 | lea (%pc,N),%a5 |
c906108c | 741 | |
8de307e0 | 742 | */ |
c906108c | 743 | |
eb2e12d7 | 744 | static CORE_ADDR |
8de307e0 AS |
745 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
746 | struct m68k_frame_cache *cache) | |
c906108c | 747 | { |
8de307e0 | 748 | unsigned int op; |
c906108c | 749 | |
8de307e0 AS |
750 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
751 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
752 | if (pc >= current_pc) | |
753 | return current_pc; | |
c906108c | 754 | |
8de307e0 AS |
755 | /* Check for GOT setup. */ |
756 | op = read_memory_unsigned_integer (pc, 4); | |
757 | if (op == P_LEA_PC_A5) | |
c906108c | 758 | { |
8de307e0 AS |
759 | /* lea (%pc,N),%a5 */ |
760 | return pc + 6; | |
c906108c | 761 | } |
8de307e0 AS |
762 | |
763 | return pc; | |
c906108c SS |
764 | } |
765 | ||
8de307e0 | 766 | /* Return PC of first real instruction. */ |
7f8e7424 | 767 | |
8de307e0 AS |
768 | static CORE_ADDR |
769 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 770 | { |
8de307e0 AS |
771 | struct m68k_frame_cache cache; |
772 | CORE_ADDR pc; | |
773 | int op; | |
c906108c | 774 | |
8de307e0 AS |
775 | cache.locals = -1; |
776 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
777 | if (cache.locals < 0) | |
778 | return start_pc; | |
779 | return pc; | |
780 | } | |
c906108c | 781 | |
8de307e0 AS |
782 | static CORE_ADDR |
783 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
784 | { | |
f5cf7aa1 | 785 | gdb_byte buf[8]; |
7f8e7424 | 786 | |
8de307e0 AS |
787 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
788 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
789 | } | |
790 | \f | |
791 | /* Normal frames. */ | |
7f8e7424 | 792 | |
8de307e0 AS |
793 | static struct m68k_frame_cache * |
794 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
795 | { | |
796 | struct m68k_frame_cache *cache; | |
f5cf7aa1 | 797 | gdb_byte buf[4]; |
8de307e0 AS |
798 | int i; |
799 | ||
800 | if (*this_cache) | |
801 | return *this_cache; | |
802 | ||
803 | cache = m68k_alloc_frame_cache (); | |
804 | *this_cache = cache; | |
805 | ||
806 | /* In principle, for normal frames, %fp holds the frame pointer, | |
807 | which holds the base address for the current stack frame. | |
808 | However, for functions that don't need it, the frame pointer is | |
809 | optional. For these "frameless" functions the frame pointer is | |
810 | actually the frame pointer of the calling frame. Signal | |
811 | trampolines are just a special case of a "frameless" function. | |
812 | They (usually) share their frame pointer with the frame that was | |
813 | in progress when the signal occurred. */ | |
814 | ||
815 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
816 | cache->base = extract_unsigned_integer (buf, 4); | |
817 | if (cache->base == 0) | |
818 | return cache; | |
819 | ||
820 | /* For normal frames, %pc is stored at 4(%fp). */ | |
821 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
822 | ||
93d42b30 | 823 | cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME); |
8de307e0 AS |
824 | if (cache->pc != 0) |
825 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
826 | ||
827 | if (cache->locals < 0) | |
828 | { | |
829 | /* We didn't find a valid frame, which means that CACHE->base | |
830 | currently holds the frame pointer for our calling frame. If | |
831 | we're at the start of a function, or somewhere half-way its | |
832 | prologue, the function's frame probably hasn't been fully | |
833 | setup yet. Try to reconstruct the base address for the stack | |
834 | frame by looking at the stack pointer. For truly "frameless" | |
835 | functions this might work too. */ | |
836 | ||
837 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
838 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
839 | } | |
7f8e7424 | 840 | |
8de307e0 AS |
841 | /* Now that we have the base address for the stack frame we can |
842 | calculate the value of %sp in the calling frame. */ | |
843 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 844 | |
8de307e0 AS |
845 | /* Adjust all the saved registers such that they contain addresses |
846 | instead of offsets. */ | |
847 | for (i = 0; i < M68K_NUM_REGS; i++) | |
848 | if (cache->saved_regs[i] != -1) | |
849 | cache->saved_regs[i] += cache->base; | |
c906108c | 850 | |
8de307e0 AS |
851 | return cache; |
852 | } | |
c906108c | 853 | |
8de307e0 AS |
854 | static void |
855 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
856 | struct frame_id *this_id) | |
857 | { | |
858 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 859 | |
8de307e0 AS |
860 | /* This marks the outermost frame. */ |
861 | if (cache->base == 0) | |
862 | return; | |
c5aa993b | 863 | |
8de307e0 AS |
864 | /* See the end of m68k_push_dummy_call. */ |
865 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
866 | } | |
c5aa993b | 867 | |
8de307e0 AS |
868 | static void |
869 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
870 | int regnum, int *optimizedp, | |
871 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
60b04da5 | 872 | int *realnump, gdb_byte *valuep) |
8de307e0 AS |
873 | { |
874 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
875 | ||
876 | gdb_assert (regnum >= 0); | |
877 | ||
878 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 879 | { |
8de307e0 AS |
880 | *optimizedp = 0; |
881 | *lvalp = not_lval; | |
882 | *addrp = 0; | |
883 | *realnump = -1; | |
884 | if (valuep) | |
c906108c | 885 | { |
8de307e0 AS |
886 | /* Store the value. */ |
887 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 888 | } |
8de307e0 AS |
889 | return; |
890 | } | |
891 | ||
892 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
893 | { | |
894 | *optimizedp = 0; | |
895 | *lvalp = lval_memory; | |
896 | *addrp = cache->saved_regs[regnum]; | |
897 | *realnump = -1; | |
898 | if (valuep) | |
89c3b6d3 | 899 | { |
8de307e0 AS |
900 | /* Read the value in from memory. */ |
901 | read_memory (*addrp, valuep, | |
902 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 903 | } |
8de307e0 | 904 | return; |
c906108c | 905 | } |
8de307e0 | 906 | |
00b25ff3 AC |
907 | *optimizedp = 0; |
908 | *lvalp = lval_register; | |
909 | *addrp = 0; | |
910 | *realnump = regnum; | |
911 | if (valuep) | |
912 | frame_unwind_register (next_frame, (*realnump), valuep); | |
8de307e0 AS |
913 | } |
914 | ||
915 | static const struct frame_unwind m68k_frame_unwind = | |
916 | { | |
917 | NORMAL_FRAME, | |
918 | m68k_frame_this_id, | |
919 | m68k_frame_prev_register | |
920 | }; | |
921 | ||
922 | static const struct frame_unwind * | |
336d1bba | 923 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
924 | { |
925 | return &m68k_frame_unwind; | |
926 | } | |
927 | \f | |
8de307e0 AS |
928 | static CORE_ADDR |
929 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
930 | { | |
931 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
932 | ||
933 | return cache->base; | |
934 | } | |
935 | ||
936 | static const struct frame_base m68k_frame_base = | |
937 | { | |
938 | &m68k_frame_unwind, | |
939 | m68k_frame_base_address, | |
940 | m68k_frame_base_address, | |
941 | m68k_frame_base_address | |
942 | }; | |
943 | ||
944 | static struct frame_id | |
945 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
946 | { | |
f5cf7aa1 | 947 | gdb_byte buf[4]; |
8de307e0 | 948 | CORE_ADDR fp; |
c906108c | 949 | |
8de307e0 AS |
950 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
951 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 952 | |
8de307e0 AS |
953 | /* See the end of m68k_push_dummy_call. */ |
954 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
955 | } | |
956 | \f | |
c906108c | 957 | |
c906108c SS |
958 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
959 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
960 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
961 | This routine returns true on success. */ | |
962 | ||
c34d127c | 963 | static int |
f4281f55 | 964 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 965 | { |
f5cf7aa1 | 966 | gdb_byte *buf; |
c906108c | 967 | CORE_ADDR sp, jb_addr; |
eb2e12d7 AS |
968 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
969 | ||
970 | if (tdep->jb_pc < 0) | |
971 | { | |
972 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 973 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
974 | return 0; |
975 | } | |
c906108c | 976 | |
35fc8285 | 977 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 978 | sp = read_register (SP_REGNUM); |
c906108c | 979 | |
b5d78d39 GS |
980 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
981 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
982 | return 0; |
983 | ||
7c0b4a20 | 984 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c | 985 | |
eb2e12d7 | 986 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c906108c SS |
987 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
988 | return 0; | |
989 | ||
7c0b4a20 | 990 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
991 | return 1; |
992 | } | |
f595cb19 MK |
993 | \f |
994 | ||
995 | /* System V Release 4 (SVR4). */ | |
996 | ||
997 | void | |
998 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
999 | { | |
1000 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1001 | ||
1002 | /* SVR4 uses a different calling convention. */ | |
1003 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1004 | ||
1005 | /* SVR4 uses %a0 instead of %a1. */ | |
1006 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1007 | } | |
1008 | \f | |
c906108c | 1009 | |
152d9db6 GS |
1010 | /* Function: m68k_gdbarch_init |
1011 | Initializer function for the m68k gdbarch vector. | |
1012 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1013 | ||
1014 | static struct gdbarch * | |
1015 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1016 | { | |
1017 | struct gdbarch_tdep *tdep = NULL; | |
1018 | struct gdbarch *gdbarch; | |
1019 | ||
1020 | /* find a candidate among the list of pre-declared architectures. */ | |
1021 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1022 | if (arches != NULL) | |
1023 | return (arches->gdbarch); | |
1024 | ||
eb2e12d7 AS |
1025 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1026 | gdbarch = gdbarch_alloc (&info, tdep); | |
152d9db6 | 1027 | |
8da61cc4 | 1028 | set_gdbarch_long_double_format (gdbarch, floatformats_m68881_ext); |
5d3ed2e3 GS |
1029 | set_gdbarch_long_double_bit (gdbarch, 96); |
1030 | ||
5d3ed2e3 | 1031 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1032 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1033 | |
1034 | /* Stack grows down. */ | |
1035 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
9bb47d95 | 1036 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1037 | |
1038 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 | 1039 | |
6300c360 | 1040 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 NS |
1041 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
1042 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); | |
942dc0e9 | 1043 | |
8de307e0 | 1044 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1045 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1046 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
942dc0e9 | 1047 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); |
32eeb91a | 1048 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1049 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1050 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1051 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
e47577ab MK |
1052 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1053 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1054 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1055 | |
8de307e0 | 1056 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1057 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1058 | |
650fcc91 AS |
1059 | /* Disassembler. */ |
1060 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1061 | ||
eb2e12d7 AS |
1062 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1063 | tdep->jb_pc = JB_PC; | |
1064 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1065 | #else | |
1066 | tdep->jb_pc = -1; | |
1067 | #endif | |
f595cb19 | 1068 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1069 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1070 | |
1071 | /* Frame unwinder. */ | |
1072 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1073 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1074 | |
1075 | /* Hook in the DWARF CFI frame unwinder. */ | |
1076 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1077 | ||
8de307e0 | 1078 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1079 | |
55809acb AS |
1080 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1081 | gdbarch_init_osabi (info, gdbarch); | |
1082 | ||
eb2e12d7 AS |
1083 | /* Now we have tuned the configuration, set a few final things, |
1084 | based on what the OS ABI has told us. */ | |
1085 | ||
1086 | if (tdep->jb_pc >= 0) | |
1087 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1088 | ||
336d1bba | 1089 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1090 | |
152d9db6 GS |
1091 | return gdbarch; |
1092 | } | |
1093 | ||
1094 | ||
1095 | static void | |
1096 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1097 | { | |
eb2e12d7 | 1098 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1099 | |
eb2e12d7 AS |
1100 | if (tdep == NULL) |
1101 | return; | |
152d9db6 | 1102 | } |
2acceee2 | 1103 | |
a78f21af AC |
1104 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1105 | ||
c906108c | 1106 | void |
fba45db2 | 1107 | _initialize_m68k_tdep (void) |
c906108c | 1108 | { |
152d9db6 | 1109 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1110 | } |