Commit | Line | Data |
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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" |
8ed86d01 | 39 | #include "target-descriptions.h" |
32eeb91a AS |
40 | |
41 | #include "m68k-tdep.h" | |
c906108c | 42 | \f |
c5aa993b | 43 | |
89c3b6d3 PDM |
44 | #define P_LINKL_FP 0x480e |
45 | #define P_LINKW_FP 0x4e56 | |
46 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
47 | #define P_MOVEAL_SP_FP 0x2c4f |
48 | #define P_ADDAW_SP 0xdefc | |
49 | #define P_ADDAL_SP 0xdffc | |
50 | #define P_SUBQW_SP 0x514f | |
51 | #define P_SUBQL_SP 0x518f | |
52 | #define P_LEA_SP_SP 0x4fef | |
53 | #define P_LEA_PC_A5 0x4bfb0170 | |
54 | #define P_FMOVEMX_SP 0xf227 | |
55 | #define P_MOVEL_SP 0x2f00 | |
56 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 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 | ||
f5cf7aa1 | 65 | static const gdb_byte * |
103a1597 GS |
66 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
67 | { | |
f5cf7aa1 | 68 | static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
103a1597 GS |
69 | *lenptr = sizeof (break_insn); |
70 | return break_insn; | |
71 | } | |
72 | ||
d85fe7f7 AS |
73 | /* Return the GDB type object for the "standard" data type of data in |
74 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
75 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
76 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
77 | addresses return pointer to void, not pointer to char, because we | |
78 | don't want to attempt to print the string after printing the | |
79 | address. */ | |
5d3ed2e3 GS |
80 | |
81 | static struct type * | |
8de307e0 | 82 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 83 | { |
8ed86d01 | 84 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
03dac896 | 85 | |
8ed86d01 VP |
86 | if (tdep->fpregs_present) |
87 | { | |
3e8c568d UW |
88 | if (regnum >= gdbarch_fp0_regnum (current_gdbarch) |
89 | && regnum <= gdbarch_fp0_regnum (current_gdbarch) + 7) | |
8ed86d01 VP |
90 | { |
91 | if (tdep->flavour == m68k_coldfire_flavour) | |
92 | return builtin_type (gdbarch)->builtin_double; | |
93 | else | |
94 | return builtin_type_m68881_ext; | |
95 | } | |
96 | ||
97 | if (regnum == M68K_FPI_REGNUM) | |
98 | return builtin_type_void_func_ptr; | |
99 | ||
100 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) | |
101 | return builtin_type_int32; | |
102 | } | |
103 | else | |
104 | { | |
105 | if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) | |
106 | return builtin_type_int0; | |
107 | } | |
03dac896 | 108 | |
3e8c568d | 109 | if (regnum == gdbarch_pc_regnum (current_gdbarch)) |
8ed86d01 | 110 | return builtin_type_void_func_ptr; |
03dac896 | 111 | |
32eeb91a | 112 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
113 | return builtin_type_void_data_ptr; |
114 | ||
115 | return builtin_type_int32; | |
5d3ed2e3 GS |
116 | } |
117 | ||
8ed86d01 | 118 | static const char *m68k_register_names[] = { |
5d3ed2e3 GS |
119 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
120 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
121 | "ps", "pc", | |
122 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
8ed86d01 | 123 | "fpcontrol", "fpstatus", "fpiaddr" |
5d3ed2e3 GS |
124 | }; |
125 | ||
8ed86d01 VP |
126 | /* Function: m68k_register_name |
127 | Returns the name of the standard m68k register regnum. */ | |
128 | ||
129 | static const char * | |
130 | m68k_register_name (int regnum) | |
131 | { | |
132 | if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names)) | |
5d3ed2e3 | 133 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 134 | _("m68k_register_name: illegal register number %d"), regnum); |
5d3ed2e3 | 135 | else |
8ed86d01 | 136 | return m68k_register_names[regnum]; |
5d3ed2e3 | 137 | } |
e47577ab MK |
138 | \f |
139 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
140 | needs any special handling. */ | |
141 | ||
142 | static int | |
143 | m68k_convert_register_p (int regnum, struct type *type) | |
144 | { | |
8ed86d01 VP |
145 | if (!gdbarch_tdep (current_gdbarch)->fpregs_present) |
146 | return 0; | |
e47577ab MK |
147 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7); |
148 | } | |
149 | ||
150 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
151 | return its contents in TO. */ | |
152 | ||
153 | static void | |
154 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 155 | struct type *type, gdb_byte *to) |
e47577ab | 156 | { |
f5cf7aa1 | 157 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 158 | struct type *fpreg_type = register_type (current_gdbarch, M68K_FP0_REGNUM); |
e47577ab MK |
159 | |
160 | /* We only support floating-point values. */ | |
161 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
162 | { | |
8a3fe4f8 AC |
163 | warning (_("Cannot convert floating-point register value " |
164 | "to non-floating-point type.")); | |
e47577ab MK |
165 | return; |
166 | } | |
167 | ||
168 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to | |
169 | the extended floating-point format used by the FPU. */ | |
170 | get_frame_register (frame, regnum, from); | |
8ed86d01 | 171 | convert_typed_floating (from, fpreg_type, to, type); |
e47577ab MK |
172 | } |
173 | ||
174 | /* Write the contents FROM of a value of type TYPE into register | |
175 | REGNUM in frame FRAME. */ | |
176 | ||
177 | static void | |
178 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 179 | struct type *type, const gdb_byte *from) |
e47577ab | 180 | { |
f5cf7aa1 | 181 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 182 | struct type *fpreg_type = register_type (current_gdbarch, M68K_FP0_REGNUM); |
e47577ab MK |
183 | |
184 | /* We only support floating-point values. */ | |
185 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
186 | { | |
8a3fe4f8 AC |
187 | warning (_("Cannot convert non-floating-point type " |
188 | "to floating-point register value.")); | |
e47577ab MK |
189 | return; |
190 | } | |
191 | ||
192 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent | |
193 | to the extended floating-point format used by the FPU. */ | |
8ed86d01 | 194 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
195 | put_frame_register (frame, regnum, to); |
196 | } | |
197 | ||
8de307e0 | 198 | \f |
f595cb19 MK |
199 | /* There is a fair number of calling conventions that are in somewhat |
200 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
201 | coprocessor. All function return values are stored in %d0/%d1. | |
202 | Structures are returned in a static buffer, a pointer to which is | |
203 | returned in %d0. This means that functions returning a structure | |
204 | are not re-entrant. To avoid this problem some systems use a | |
205 | convention where the caller passes a pointer to a buffer in %a1 | |
206 | where the return values is to be stored. This convention is the | |
207 | default, and is implemented in the function m68k_return_value. | |
208 | ||
209 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
210 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
211 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
212 | psABI. Integer values are returned in %d0/%d1, pointer return | |
213 | values in %a0 and floating values in %fp0. When calling functions | |
214 | returning a structure the caller should pass a pointer to a buffer | |
215 | for the return value in %a0. This convention is implemented in the | |
216 | function m68k_svr4_return_value, and by appropriately setting the | |
217 | struct_value_regnum member of `struct gdbarch_tdep'. | |
218 | ||
219 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
220 | for passing the structure return value buffer. | |
221 | ||
222 | GCC can also generate code where small structures are returned in | |
223 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
224 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
225 | embedded systems. This convention is implemented by setting the | |
226 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
227 | ||
228 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 229 | into VALBUF. */ |
942dc0e9 GS |
230 | |
231 | static void | |
8de307e0 | 232 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 233 | gdb_byte *valbuf) |
942dc0e9 | 234 | { |
8de307e0 | 235 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 236 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 237 | |
8de307e0 AS |
238 | if (len <= 4) |
239 | { | |
240 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
241 | memcpy (valbuf, buf + (4 - len), len); | |
242 | } | |
243 | else if (len <= 8) | |
244 | { | |
245 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
246 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 247 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
248 | } |
249 | else | |
250 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 251 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
252 | } |
253 | ||
942dc0e9 | 254 | static void |
f595cb19 | 255 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 256 | gdb_byte *valbuf) |
942dc0e9 | 257 | { |
8de307e0 | 258 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 259 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 260 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
942dc0e9 | 261 | |
8ed86d01 | 262 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 263 | { |
8ed86d01 VP |
264 | struct type *fpreg_type = register_type |
265 | (current_gdbarch, M68K_FP0_REGNUM); | |
f595cb19 | 266 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 267 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 268 | } |
f595cb19 MK |
269 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
270 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
271 | else | |
272 | m68k_extract_return_value (type, regcache, valbuf); | |
273 | } | |
274 | ||
275 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
276 | ||
277 | static void | |
278 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 279 | const gdb_byte *valbuf) |
f595cb19 MK |
280 | { |
281 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 282 | |
8de307e0 AS |
283 | if (len <= 4) |
284 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
285 | else if (len <= 8) | |
286 | { | |
f595cb19 | 287 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 288 | len - 4, valbuf); |
f5cf7aa1 | 289 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
290 | } |
291 | else | |
292 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 293 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 294 | } |
942dc0e9 | 295 | |
f595cb19 MK |
296 | static void |
297 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 298 | const gdb_byte *valbuf) |
942dc0e9 | 299 | { |
f595cb19 | 300 | int len = TYPE_LENGTH (type); |
8ed86d01 | 301 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
8de307e0 | 302 | |
8ed86d01 | 303 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 304 | { |
8ed86d01 VP |
305 | struct type *fpreg_type = register_type |
306 | (current_gdbarch, M68K_FP0_REGNUM); | |
f5cf7aa1 | 307 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 308 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
309 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
310 | } | |
311 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
312 | { | |
313 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
314 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
315 | } | |
316 | else | |
317 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
318 | } |
319 | ||
f595cb19 MK |
320 | /* Return non-zero if TYPE, which is assumed to be a structure or |
321 | union type, should be returned in registers for architecture | |
322 | GDBARCH. */ | |
323 | ||
c481dac7 | 324 | static int |
f595cb19 | 325 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 326 | { |
f595cb19 MK |
327 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
328 | enum type_code code = TYPE_CODE (type); | |
329 | int len = TYPE_LENGTH (type); | |
c481dac7 | 330 | |
f595cb19 MK |
331 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
332 | ||
333 | if (tdep->struct_return == pcc_struct_return) | |
334 | return 0; | |
335 | ||
336 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
337 | } |
338 | ||
f595cb19 MK |
339 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
340 | should be returned. If it is supposed to be returned in registers, | |
341 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
342 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
343 | from WRITEBUF into REGCACHE. */ | |
344 | ||
345 | static enum return_value_convention | |
346 | m68k_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
347 | struct regcache *regcache, gdb_byte *readbuf, |
348 | const gdb_byte *writebuf) | |
f595cb19 MK |
349 | { |
350 | enum type_code code = TYPE_CODE (type); | |
351 | ||
1c845060 MK |
352 | /* GCC returns a `long double' in memory too. */ |
353 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
354 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
355 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
356 | { | |
357 | /* The default on m68k is to return structures in static memory. | |
358 | Consequently a function must return the address where we can | |
359 | find the return value. */ | |
f595cb19 | 360 | |
1c845060 MK |
361 | if (readbuf) |
362 | { | |
363 | ULONGEST addr; | |
364 | ||
365 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
366 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
367 | } | |
368 | ||
369 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
370 | } | |
f595cb19 MK |
371 | |
372 | if (readbuf) | |
373 | m68k_extract_return_value (type, regcache, readbuf); | |
374 | if (writebuf) | |
375 | m68k_store_return_value (type, regcache, writebuf); | |
376 | ||
377 | return RETURN_VALUE_REGISTER_CONVENTION; | |
378 | } | |
379 | ||
380 | static enum return_value_convention | |
381 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
382 | struct regcache *regcache, gdb_byte *readbuf, |
383 | const gdb_byte *writebuf) | |
f595cb19 MK |
384 | { |
385 | enum type_code code = TYPE_CODE (type); | |
386 | ||
387 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
388 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
389 | { |
390 | /* The System V ABI says that: | |
391 | ||
392 | "A function returning a structure or union also sets %a0 to | |
393 | the value it finds in %a0. Thus when the caller receives | |
394 | control again, the address of the returned object resides in | |
395 | register %a0." | |
396 | ||
397 | So the ABI guarantees that we can always find the return | |
398 | value just after the function has returned. */ | |
399 | ||
400 | if (readbuf) | |
401 | { | |
402 | ULONGEST addr; | |
403 | ||
404 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
405 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
406 | } | |
407 | ||
408 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
409 | } | |
f595cb19 MK |
410 | |
411 | /* This special case is for structures consisting of a single | |
412 | `float' or `double' member. These structures are returned in | |
413 | %fp0. For these structures, we call ourselves recursively, | |
414 | changing TYPE into the type of the first member of the structure. | |
415 | Since that should work for all structures that have only one | |
416 | member, we don't bother to check the member's type here. */ | |
417 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
418 | { | |
419 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
420 | return m68k_svr4_return_value (gdbarch, type, regcache, | |
421 | readbuf, writebuf); | |
422 | } | |
423 | ||
424 | if (readbuf) | |
425 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
426 | if (writebuf) | |
427 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
428 | ||
429 | return RETURN_VALUE_REGISTER_CONVENTION; | |
430 | } | |
431 | \f | |
392a587b | 432 | |
9bb47d95 NS |
433 | /* Always align the frame to a 4-byte boundary. This is required on |
434 | coldfire and harmless on the rest. */ | |
435 | ||
436 | static CORE_ADDR | |
437 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
438 | { | |
439 | /* Align the stack to four bytes. */ | |
440 | return sp & ~3; | |
441 | } | |
442 | ||
8de307e0 | 443 | static CORE_ADDR |
7d9b040b | 444 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
445 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
446 | struct value **args, CORE_ADDR sp, int struct_return, | |
447 | CORE_ADDR struct_addr) | |
7f8e7424 | 448 | { |
f595cb19 | 449 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
f5cf7aa1 | 450 | gdb_byte buf[4]; |
8de307e0 AS |
451 | int i; |
452 | ||
453 | /* Push arguments in reverse order. */ | |
454 | for (i = nargs - 1; i >= 0; i--) | |
455 | { | |
4754a64e | 456 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 457 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 458 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
459 | int offset; |
460 | ||
461 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
462 | right aligned. */ | |
463 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
464 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
465 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
466 | && len > 4) | |
467 | offset = 0; | |
468 | else | |
469 | offset = container_len - len; | |
8de307e0 | 470 | sp -= container_len; |
46615f07 | 471 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
472 | } |
473 | ||
c481dac7 | 474 | /* Store struct value address. */ |
8de307e0 AS |
475 | if (struct_return) |
476 | { | |
8de307e0 | 477 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 478 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
479 | } |
480 | ||
481 | /* Store return address. */ | |
482 | sp -= 4; | |
483 | store_unsigned_integer (buf, 4, bp_addr); | |
484 | write_memory (sp, buf, 4); | |
485 | ||
486 | /* Finally, update the stack pointer... */ | |
487 | store_unsigned_integer (buf, 4, sp); | |
488 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
489 | ||
490 | /* ...and fake a frame pointer. */ | |
491 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
492 | ||
493 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
494 | frame's CFA. */ | |
495 | return sp + 8; | |
7f8e7424 | 496 | } |
6dd0fba6 NS |
497 | |
498 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
499 | ||
500 | static int | |
501 | m68k_dwarf_reg_to_regnum (int num) | |
502 | { | |
503 | if (num < 8) | |
504 | /* d0..7 */ | |
505 | return (num - 0) + M68K_D0_REGNUM; | |
506 | else if (num < 16) | |
507 | /* a0..7 */ | |
508 | return (num - 8) + M68K_A0_REGNUM; | |
8ed86d01 | 509 | else if (num < 24 && gdbarch_tdep (current_gdbarch)->fpregs_present) |
6dd0fba6 NS |
510 | /* fp0..7 */ |
511 | return (num - 16) + M68K_FP0_REGNUM; | |
512 | else if (num == 25) | |
513 | /* pc */ | |
514 | return M68K_PC_REGNUM; | |
515 | else | |
f57d151a UW |
516 | return gdbarch_num_regs (current_gdbarch) |
517 | + gdbarch_num_pseudo_regs (current_gdbarch); | |
6dd0fba6 NS |
518 | } |
519 | ||
8de307e0 AS |
520 | \f |
521 | struct m68k_frame_cache | |
522 | { | |
523 | /* Base address. */ | |
524 | CORE_ADDR base; | |
525 | CORE_ADDR sp_offset; | |
526 | CORE_ADDR pc; | |
7f8e7424 | 527 | |
8de307e0 AS |
528 | /* Saved registers. */ |
529 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
530 | CORE_ADDR saved_sp; | |
7f8e7424 | 531 | |
8de307e0 AS |
532 | /* Stack space reserved for local variables. */ |
533 | long locals; | |
534 | }; | |
c906108c | 535 | |
8de307e0 AS |
536 | /* Allocate and initialize a frame cache. */ |
537 | ||
538 | static struct m68k_frame_cache * | |
539 | m68k_alloc_frame_cache (void) | |
c906108c | 540 | { |
8de307e0 AS |
541 | struct m68k_frame_cache *cache; |
542 | int i; | |
c906108c | 543 | |
8de307e0 | 544 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 545 | |
8de307e0 AS |
546 | /* Base address. */ |
547 | cache->base = 0; | |
548 | cache->sp_offset = -4; | |
549 | cache->pc = 0; | |
c906108c | 550 | |
8de307e0 AS |
551 | /* Saved registers. We initialize these to -1 since zero is a valid |
552 | offset (that's where %fp is supposed to be stored). */ | |
553 | for (i = 0; i < M68K_NUM_REGS; i++) | |
554 | cache->saved_regs[i] = -1; | |
555 | ||
556 | /* Frameless until proven otherwise. */ | |
557 | cache->locals = -1; | |
558 | ||
559 | return cache; | |
c906108c SS |
560 | } |
561 | ||
8de307e0 AS |
562 | /* Check whether PC points at a code that sets up a new stack frame. |
563 | If so, it updates CACHE and returns the address of the first | |
564 | instruction after the sequence that sets removes the "hidden" | |
565 | argument from the stack or CURRENT_PC, whichever is smaller. | |
566 | Otherwise, return PC. */ | |
c906108c | 567 | |
8de307e0 AS |
568 | static CORE_ADDR |
569 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
570 | struct m68k_frame_cache *cache) | |
c906108c | 571 | { |
8de307e0 AS |
572 | int op; |
573 | ||
574 | if (pc >= current_pc) | |
575 | return current_pc; | |
c906108c | 576 | |
8de307e0 AS |
577 | op = read_memory_unsigned_integer (pc, 2); |
578 | ||
579 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 580 | { |
8de307e0 AS |
581 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
582 | cache->sp_offset += 4; | |
583 | if (op == P_LINKW_FP) | |
584 | { | |
585 | /* link.w %fp, #-N */ | |
586 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
587 | cache->locals = -read_memory_integer (pc + 2, 2); | |
588 | ||
589 | if (pc + 4 < current_pc && cache->locals == 0) | |
590 | { | |
591 | op = read_memory_unsigned_integer (pc + 4, 2); | |
592 | if (op == P_ADDAL_SP) | |
593 | { | |
594 | cache->locals = read_memory_integer (pc + 6, 4); | |
595 | return pc + 10; | |
596 | } | |
597 | } | |
598 | ||
599 | return pc + 4; | |
600 | } | |
601 | else if (op == P_LINKL_FP) | |
c906108c | 602 | { |
8de307e0 AS |
603 | /* link.l %fp, #-N */ |
604 | cache->locals = -read_memory_integer (pc + 2, 4); | |
605 | return pc + 6; | |
606 | } | |
607 | else | |
608 | { | |
609 | /* pea (%fp); movea.l %sp, %fp */ | |
610 | cache->locals = 0; | |
611 | ||
612 | if (pc + 2 < current_pc) | |
613 | { | |
614 | op = read_memory_unsigned_integer (pc + 2, 2); | |
615 | ||
616 | if (op == P_MOVEAL_SP_FP) | |
617 | { | |
618 | /* move.l %sp, %fp */ | |
619 | return pc + 4; | |
620 | } | |
621 | } | |
622 | ||
623 | return pc + 2; | |
c906108c SS |
624 | } |
625 | } | |
8de307e0 | 626 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 627 | { |
8de307e0 AS |
628 | /* subq.[wl] #N,%sp */ |
629 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
630 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
631 | if (pc + 2 < current_pc) | |
c906108c | 632 | { |
8de307e0 AS |
633 | op = read_memory_unsigned_integer (pc + 2, 2); |
634 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
635 | { | |
636 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
637 | return pc + 4; | |
638 | } | |
c906108c | 639 | } |
8de307e0 AS |
640 | return pc + 2; |
641 | } | |
642 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
643 | { | |
644 | /* adda.w #-N,%sp */ | |
645 | /* lea (-N,%sp),%sp */ | |
646 | cache->locals = -read_memory_integer (pc + 2, 2); | |
647 | return pc + 4; | |
c906108c | 648 | } |
8de307e0 | 649 | else if (op == P_ADDAL_SP) |
c906108c | 650 | { |
8de307e0 AS |
651 | /* adda.l #-N,%sp */ |
652 | cache->locals = -read_memory_integer (pc + 2, 4); | |
653 | return pc + 6; | |
c906108c | 654 | } |
8de307e0 AS |
655 | |
656 | return pc; | |
c906108c | 657 | } |
c5aa993b | 658 | |
8de307e0 AS |
659 | /* Check whether PC points at code that saves registers on the stack. |
660 | If so, it updates CACHE and returns the address of the first | |
661 | instruction after the register saves or CURRENT_PC, whichever is | |
662 | smaller. Otherwise, return PC. */ | |
c906108c | 663 | |
8de307e0 AS |
664 | static CORE_ADDR |
665 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
666 | struct m68k_frame_cache *cache) | |
667 | { | |
668 | if (cache->locals >= 0) | |
669 | { | |
670 | CORE_ADDR offset; | |
671 | int op; | |
672 | int i, mask, regno; | |
c906108c | 673 | |
8de307e0 AS |
674 | offset = -4 - cache->locals; |
675 | while (pc < current_pc) | |
676 | { | |
677 | op = read_memory_unsigned_integer (pc, 2); | |
8ed86d01 VP |
678 | if (op == P_FMOVEMX_SP |
679 | && gdbarch_tdep (current_gdbarch)->fpregs_present) | |
8de307e0 AS |
680 | { |
681 | /* fmovem.x REGS,-(%sp) */ | |
682 | op = read_memory_unsigned_integer (pc + 2, 2); | |
683 | if ((op & 0xff00) == 0xe000) | |
684 | { | |
685 | mask = op & 0xff; | |
686 | for (i = 0; i < 16; i++, mask >>= 1) | |
687 | { | |
688 | if (mask & 1) | |
689 | { | |
690 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
691 | offset -= 12; | |
692 | } | |
693 | } | |
694 | pc += 4; | |
695 | } | |
696 | else | |
697 | break; | |
698 | } | |
0ba5a932 | 699 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
700 | { |
701 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 702 | regno = op & 017; |
8de307e0 AS |
703 | cache->saved_regs[regno] = offset; |
704 | offset -= 4; | |
705 | pc += 2; | |
706 | } | |
707 | else if (op == P_MOVEML_SP) | |
708 | { | |
709 | /* movem.l REGS,-(%sp) */ | |
710 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
711 | for (i = 0; i < 16; i++, mask >>= 1) | |
712 | { | |
713 | if (mask & 1) | |
714 | { | |
715 | cache->saved_regs[15 - i] = offset; | |
716 | offset -= 4; | |
717 | } | |
718 | } | |
719 | pc += 4; | |
720 | } | |
721 | else | |
722 | break; | |
723 | } | |
724 | } | |
725 | ||
726 | return pc; | |
727 | } | |
c906108c | 728 | |
c906108c | 729 | |
8de307e0 AS |
730 | /* Do a full analysis of the prologue at PC and update CACHE |
731 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
732 | address where the analysis stopped. | |
c906108c | 733 | |
8de307e0 | 734 | We handle all cases that can be generated by gcc. |
c906108c | 735 | |
8de307e0 | 736 | For allocating a stack frame: |
c906108c | 737 | |
8de307e0 AS |
738 | link.w %a6,#-N |
739 | link.l %a6,#-N | |
740 | pea (%fp); move.l %sp,%fp | |
741 | link.w %a6,#0; add.l #-N,%sp | |
742 | subq.l #N,%sp | |
743 | subq.w #N,%sp | |
744 | subq.w #8,%sp; subq.w #N-8,%sp | |
745 | add.w #-N,%sp | |
746 | lea (-N,%sp),%sp | |
747 | add.l #-N,%sp | |
c906108c | 748 | |
8de307e0 | 749 | For saving registers: |
c906108c | 750 | |
8de307e0 AS |
751 | fmovem.x REGS,-(%sp) |
752 | move.l R1,-(%sp) | |
753 | move.l R1,-(%sp); move.l R2,-(%sp) | |
754 | movem.l REGS,-(%sp) | |
c906108c | 755 | |
8de307e0 | 756 | For setting up the PIC register: |
c906108c | 757 | |
8de307e0 | 758 | lea (%pc,N),%a5 |
c906108c | 759 | |
8de307e0 | 760 | */ |
c906108c | 761 | |
eb2e12d7 | 762 | static CORE_ADDR |
8de307e0 AS |
763 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
764 | struct m68k_frame_cache *cache) | |
c906108c | 765 | { |
8de307e0 | 766 | unsigned int op; |
c906108c | 767 | |
8de307e0 AS |
768 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
769 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
770 | if (pc >= current_pc) | |
771 | return current_pc; | |
c906108c | 772 | |
8de307e0 AS |
773 | /* Check for GOT setup. */ |
774 | op = read_memory_unsigned_integer (pc, 4); | |
775 | if (op == P_LEA_PC_A5) | |
c906108c | 776 | { |
8de307e0 AS |
777 | /* lea (%pc,N),%a5 */ |
778 | return pc + 6; | |
c906108c | 779 | } |
8de307e0 AS |
780 | |
781 | return pc; | |
c906108c SS |
782 | } |
783 | ||
8de307e0 | 784 | /* Return PC of first real instruction. */ |
7f8e7424 | 785 | |
8de307e0 AS |
786 | static CORE_ADDR |
787 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 788 | { |
8de307e0 AS |
789 | struct m68k_frame_cache cache; |
790 | CORE_ADDR pc; | |
791 | int op; | |
c906108c | 792 | |
8de307e0 AS |
793 | cache.locals = -1; |
794 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
795 | if (cache.locals < 0) | |
796 | return start_pc; | |
797 | return pc; | |
798 | } | |
c906108c | 799 | |
8de307e0 AS |
800 | static CORE_ADDR |
801 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
802 | { | |
f5cf7aa1 | 803 | gdb_byte buf[8]; |
7f8e7424 | 804 | |
3e8c568d | 805 | frame_unwind_register (next_frame, gdbarch_pc_regnum (current_gdbarch), buf); |
8de307e0 AS |
806 | return extract_typed_address (buf, builtin_type_void_func_ptr); |
807 | } | |
808 | \f | |
809 | /* Normal frames. */ | |
7f8e7424 | 810 | |
8de307e0 AS |
811 | static struct m68k_frame_cache * |
812 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
813 | { | |
814 | struct m68k_frame_cache *cache; | |
f5cf7aa1 | 815 | gdb_byte buf[4]; |
8de307e0 AS |
816 | int i; |
817 | ||
818 | if (*this_cache) | |
819 | return *this_cache; | |
820 | ||
821 | cache = m68k_alloc_frame_cache (); | |
822 | *this_cache = cache; | |
823 | ||
824 | /* In principle, for normal frames, %fp holds the frame pointer, | |
825 | which holds the base address for the current stack frame. | |
826 | However, for functions that don't need it, the frame pointer is | |
827 | optional. For these "frameless" functions the frame pointer is | |
828 | actually the frame pointer of the calling frame. Signal | |
829 | trampolines are just a special case of a "frameless" function. | |
830 | They (usually) share their frame pointer with the frame that was | |
831 | in progress when the signal occurred. */ | |
832 | ||
833 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
834 | cache->base = extract_unsigned_integer (buf, 4); | |
835 | if (cache->base == 0) | |
836 | return cache; | |
837 | ||
838 | /* For normal frames, %pc is stored at 4(%fp). */ | |
839 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
840 | ||
93d42b30 | 841 | cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME); |
8de307e0 AS |
842 | if (cache->pc != 0) |
843 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
844 | ||
845 | if (cache->locals < 0) | |
846 | { | |
847 | /* We didn't find a valid frame, which means that CACHE->base | |
848 | currently holds the frame pointer for our calling frame. If | |
849 | we're at the start of a function, or somewhere half-way its | |
850 | prologue, the function's frame probably hasn't been fully | |
851 | setup yet. Try to reconstruct the base address for the stack | |
852 | frame by looking at the stack pointer. For truly "frameless" | |
853 | functions this might work too. */ | |
854 | ||
855 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
856 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
857 | } | |
7f8e7424 | 858 | |
8de307e0 AS |
859 | /* Now that we have the base address for the stack frame we can |
860 | calculate the value of %sp in the calling frame. */ | |
861 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 862 | |
8de307e0 AS |
863 | /* Adjust all the saved registers such that they contain addresses |
864 | instead of offsets. */ | |
865 | for (i = 0; i < M68K_NUM_REGS; i++) | |
866 | if (cache->saved_regs[i] != -1) | |
867 | cache->saved_regs[i] += cache->base; | |
c906108c | 868 | |
8de307e0 AS |
869 | return cache; |
870 | } | |
c906108c | 871 | |
8de307e0 AS |
872 | static void |
873 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
874 | struct frame_id *this_id) | |
875 | { | |
876 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 877 | |
8de307e0 AS |
878 | /* This marks the outermost frame. */ |
879 | if (cache->base == 0) | |
880 | return; | |
c5aa993b | 881 | |
8de307e0 AS |
882 | /* See the end of m68k_push_dummy_call. */ |
883 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
884 | } | |
c5aa993b | 885 | |
8de307e0 AS |
886 | static void |
887 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
888 | int regnum, int *optimizedp, | |
889 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
60b04da5 | 890 | int *realnump, gdb_byte *valuep) |
8de307e0 AS |
891 | { |
892 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
893 | ||
894 | gdb_assert (regnum >= 0); | |
895 | ||
896 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 897 | { |
8de307e0 AS |
898 | *optimizedp = 0; |
899 | *lvalp = not_lval; | |
900 | *addrp = 0; | |
901 | *realnump = -1; | |
902 | if (valuep) | |
c906108c | 903 | { |
8de307e0 AS |
904 | /* Store the value. */ |
905 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 906 | } |
8de307e0 AS |
907 | return; |
908 | } | |
909 | ||
910 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
911 | { | |
912 | *optimizedp = 0; | |
913 | *lvalp = lval_memory; | |
914 | *addrp = cache->saved_regs[regnum]; | |
915 | *realnump = -1; | |
916 | if (valuep) | |
89c3b6d3 | 917 | { |
8de307e0 AS |
918 | /* Read the value in from memory. */ |
919 | read_memory (*addrp, valuep, | |
920 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 921 | } |
8de307e0 | 922 | return; |
c906108c | 923 | } |
8de307e0 | 924 | |
00b25ff3 AC |
925 | *optimizedp = 0; |
926 | *lvalp = lval_register; | |
927 | *addrp = 0; | |
928 | *realnump = regnum; | |
929 | if (valuep) | |
930 | frame_unwind_register (next_frame, (*realnump), valuep); | |
8de307e0 AS |
931 | } |
932 | ||
933 | static const struct frame_unwind m68k_frame_unwind = | |
934 | { | |
935 | NORMAL_FRAME, | |
936 | m68k_frame_this_id, | |
937 | m68k_frame_prev_register | |
938 | }; | |
939 | ||
940 | static const struct frame_unwind * | |
336d1bba | 941 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
942 | { |
943 | return &m68k_frame_unwind; | |
944 | } | |
945 | \f | |
8de307e0 AS |
946 | static CORE_ADDR |
947 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
948 | { | |
949 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
950 | ||
951 | return cache->base; | |
952 | } | |
953 | ||
954 | static const struct frame_base m68k_frame_base = | |
955 | { | |
956 | &m68k_frame_unwind, | |
957 | m68k_frame_base_address, | |
958 | m68k_frame_base_address, | |
959 | m68k_frame_base_address | |
960 | }; | |
961 | ||
962 | static struct frame_id | |
963 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
964 | { | |
f5cf7aa1 | 965 | gdb_byte buf[4]; |
8de307e0 | 966 | CORE_ADDR fp; |
c906108c | 967 | |
8de307e0 AS |
968 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
969 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 970 | |
8de307e0 AS |
971 | /* See the end of m68k_push_dummy_call. */ |
972 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
973 | } | |
974 | \f | |
c906108c | 975 | |
c906108c SS |
976 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
977 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
978 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
979 | This routine returns true on success. */ | |
980 | ||
c34d127c | 981 | static int |
60ade65d | 982 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 983 | { |
f5cf7aa1 | 984 | gdb_byte *buf; |
c906108c | 985 | CORE_ADDR sp, jb_addr; |
60ade65d | 986 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
eb2e12d7 AS |
987 | |
988 | if (tdep->jb_pc < 0) | |
989 | { | |
990 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 991 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
992 | return 0; |
993 | } | |
c906108c | 994 | |
819844ad | 995 | buf = alloca (gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT); |
3e8c568d | 996 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (current_gdbarch)); |
c906108c | 997 | |
b5d78d39 | 998 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
819844ad UW |
999 | buf, |
1000 | gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT)) | |
c906108c SS |
1001 | return 0; |
1002 | ||
819844ad UW |
1003 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (current_gdbarch) |
1004 | / TARGET_CHAR_BIT); | |
c906108c | 1005 | |
eb2e12d7 | 1006 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
819844ad | 1007 | gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1008 | return 0; |
1009 | ||
819844ad UW |
1010 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (current_gdbarch) |
1011 | / TARGET_CHAR_BIT); | |
c906108c SS |
1012 | return 1; |
1013 | } | |
f595cb19 MK |
1014 | \f |
1015 | ||
1016 | /* System V Release 4 (SVR4). */ | |
1017 | ||
1018 | void | |
1019 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1020 | { | |
1021 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1022 | ||
1023 | /* SVR4 uses a different calling convention. */ | |
1024 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1025 | ||
1026 | /* SVR4 uses %a0 instead of %a1. */ | |
1027 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1028 | } | |
1029 | \f | |
c906108c | 1030 | |
152d9db6 GS |
1031 | /* Function: m68k_gdbarch_init |
1032 | Initializer function for the m68k gdbarch vector. | |
1033 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1034 | ||
1035 | static struct gdbarch * | |
1036 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1037 | { | |
1038 | struct gdbarch_tdep *tdep = NULL; | |
1039 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1040 | struct gdbarch_list *best_arch; |
1041 | struct tdesc_arch_data *tdesc_data = NULL; | |
1042 | int i; | |
1043 | enum m68k_flavour flavour = m68k_no_flavour; | |
1044 | int has_fp = 1; | |
1045 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1046 | ||
1047 | /* Check any target description for validity. */ | |
1048 | if (tdesc_has_registers (info.target_desc)) | |
1049 | { | |
1050 | const struct tdesc_feature *feature; | |
1051 | int valid_p; | |
152d9db6 | 1052 | |
8ed86d01 VP |
1053 | feature = tdesc_find_feature (info.target_desc, |
1054 | "org.gnu.gdb.m68k.core"); | |
1055 | if (feature != NULL) | |
1056 | /* Do nothing. */ | |
1057 | ; | |
1058 | ||
1059 | if (feature == NULL) | |
1060 | { | |
1061 | feature = tdesc_find_feature (info.target_desc, | |
1062 | "org.gnu.gdb.coldfire.core"); | |
1063 | if (feature != NULL) | |
1064 | flavour = m68k_coldfire_flavour; | |
1065 | } | |
1066 | ||
1067 | if (feature == NULL) | |
1068 | { | |
1069 | feature = tdesc_find_feature (info.target_desc, | |
1070 | "org.gnu.gdb.fido.core"); | |
1071 | if (feature != NULL) | |
1072 | flavour = m68k_fido_flavour; | |
1073 | } | |
1074 | ||
1075 | if (feature == NULL) | |
1076 | return NULL; | |
1077 | ||
1078 | tdesc_data = tdesc_data_alloc (); | |
1079 | ||
1080 | valid_p = 1; | |
1081 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1082 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1083 | m68k_register_names[i]); | |
1084 | ||
1085 | if (!valid_p) | |
1086 | { | |
1087 | tdesc_data_cleanup (tdesc_data); | |
1088 | return NULL; | |
1089 | } | |
1090 | ||
1091 | feature = tdesc_find_feature (info.target_desc, | |
1092 | "org.gnu.gdb.coldfire.fp"); | |
1093 | if (feature != NULL) | |
1094 | { | |
1095 | valid_p = 1; | |
1096 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1097 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1098 | m68k_register_names[i]); | |
1099 | if (!valid_p) | |
1100 | { | |
1101 | tdesc_data_cleanup (tdesc_data); | |
1102 | return NULL; | |
1103 | } | |
1104 | } | |
1105 | else | |
1106 | has_fp = 0; | |
1107 | } | |
1108 | ||
1109 | /* The mechanism for returning floating values from function | |
1110 | and the type of long double depend on whether we're | |
1111 | on ColdFire or standard m68k. */ | |
1112 | ||
1113 | if (info.bfd_arch_info) | |
1114 | { | |
1115 | const bfd_arch_info_type *coldfire_arch = | |
1116 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1117 | ||
1118 | if (coldfire_arch | |
1119 | && (*info.bfd_arch_info->compatible) | |
1120 | (info.bfd_arch_info, coldfire_arch)) | |
1121 | flavour = m68k_coldfire_flavour; | |
1122 | } | |
1123 | ||
1124 | /* If there is already a candidate, use it. */ | |
1125 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1126 | best_arch != NULL; | |
1127 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1128 | { | |
1129 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1130 | continue; | |
1131 | ||
1132 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1133 | continue; | |
1134 | ||
1135 | break; | |
1136 | } | |
152d9db6 | 1137 | |
eb2e12d7 AS |
1138 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1139 | gdbarch = gdbarch_alloc (&info, tdep); | |
8ed86d01 VP |
1140 | tdep->fpregs_present = has_fp; |
1141 | tdep->flavour = flavour; | |
152d9db6 | 1142 | |
8ed86d01 VP |
1143 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1144 | long_double_format = floatformats_ieee_double; | |
1145 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1146 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1147 | |
5d3ed2e3 | 1148 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1149 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1150 | |
1151 | /* Stack grows down. */ | |
1152 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
9bb47d95 | 1153 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1154 | |
1155 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1156 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1157 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1158 | |
6300c360 | 1159 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 NS |
1160 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
1161 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); | |
942dc0e9 | 1162 | |
8de307e0 | 1163 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1164 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1165 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1166 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1167 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1168 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1169 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
e47577ab MK |
1170 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1171 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1172 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1173 | |
8ed86d01 VP |
1174 | if (has_fp) |
1175 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1176 | ||
1177 | /* Try to figure out if the arch uses floating registers to return | |
1178 | floating point values from functions. */ | |
1179 | if (has_fp) | |
1180 | { | |
1181 | /* On ColdFire, floating point values are returned in D0. */ | |
1182 | if (flavour == m68k_coldfire_flavour) | |
1183 | tdep->float_return = 0; | |
1184 | else | |
1185 | tdep->float_return = 1; | |
1186 | } | |
1187 | else | |
1188 | { | |
1189 | /* No floating registers, so can't use them for returning values. */ | |
1190 | tdep->float_return = 0; | |
1191 | } | |
1192 | ||
1193 | /* Function call & return */ | |
8de307e0 | 1194 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1195 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1196 | |
8ed86d01 | 1197 | |
650fcc91 AS |
1198 | /* Disassembler. */ |
1199 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1200 | ||
eb2e12d7 AS |
1201 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1202 | tdep->jb_pc = JB_PC; | |
1203 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1204 | #else | |
1205 | tdep->jb_pc = -1; | |
1206 | #endif | |
f595cb19 | 1207 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1208 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1209 | |
1210 | /* Frame unwinder. */ | |
1211 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1212 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1213 | |
1214 | /* Hook in the DWARF CFI frame unwinder. */ | |
1215 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1216 | ||
8de307e0 | 1217 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1218 | |
55809acb AS |
1219 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1220 | gdbarch_init_osabi (info, gdbarch); | |
1221 | ||
eb2e12d7 AS |
1222 | /* Now we have tuned the configuration, set a few final things, |
1223 | based on what the OS ABI has told us. */ | |
1224 | ||
1225 | if (tdep->jb_pc >= 0) | |
1226 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1227 | ||
336d1bba | 1228 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1229 | |
8ed86d01 VP |
1230 | if (tdesc_data) |
1231 | tdesc_use_registers (gdbarch, tdesc_data); | |
1232 | ||
152d9db6 GS |
1233 | return gdbarch; |
1234 | } | |
1235 | ||
1236 | ||
1237 | static void | |
1238 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1239 | { | |
eb2e12d7 | 1240 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1241 | |
eb2e12d7 AS |
1242 | if (tdep == NULL) |
1243 | return; | |
152d9db6 | 1244 | } |
2acceee2 | 1245 | |
a78f21af AC |
1246 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1247 | ||
c906108c | 1248 | void |
fba45db2 | 1249 | _initialize_m68k_tdep (void) |
c906108c | 1250 | { |
152d9db6 | 1251 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1252 | } |