Commit | Line | Data |
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748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b | 2 | |
6aba47ca | 3 | Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, 2001, |
9b254dd1 | 4 | 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 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 | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
3f244638 | 22 | #include "dwarf2-frame.h" |
c906108c | 23 | #include "frame.h" |
8de307e0 AS |
24 | #include "frame-base.h" |
25 | #include "frame-unwind.h" | |
e6bb342a | 26 | #include "gdbtypes.h" |
c906108c SS |
27 | #include "symtab.h" |
28 | #include "gdbcore.h" | |
29 | #include "value.h" | |
30 | #include "gdb_string.h" | |
8de307e0 | 31 | #include "gdb_assert.h" |
7a292a7a | 32 | #include "inferior.h" |
4e052eda | 33 | #include "regcache.h" |
5d3ed2e3 | 34 | #include "arch-utils.h" |
55809acb | 35 | #include "osabi.h" |
a89aa300 | 36 | #include "dis-asm.h" |
8ed86d01 | 37 | #include "target-descriptions.h" |
32eeb91a AS |
38 | |
39 | #include "m68k-tdep.h" | |
c906108c | 40 | \f |
c5aa993b | 41 | |
89c3b6d3 PDM |
42 | #define P_LINKL_FP 0x480e |
43 | #define P_LINKW_FP 0x4e56 | |
44 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
45 | #define P_MOVEAL_SP_FP 0x2c4f |
46 | #define P_ADDAW_SP 0xdefc | |
47 | #define P_ADDAL_SP 0xdffc | |
48 | #define P_SUBQW_SP 0x514f | |
49 | #define P_SUBQL_SP 0x518f | |
50 | #define P_LEA_SP_SP 0x4fef | |
51 | #define P_LEA_PC_A5 0x4bfb0170 | |
52 | #define P_FMOVEMX_SP 0xf227 | |
53 | #define P_MOVEL_SP 0x2f00 | |
54 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 55 | |
103a1597 | 56 | /* Offset from SP to first arg on stack at first instruction of a function */ |
103a1597 GS |
57 | #define SP_ARG0 (1 * 4) |
58 | ||
103a1597 GS |
59 | #if !defined (BPT_VECTOR) |
60 | #define BPT_VECTOR 0xf | |
61 | #endif | |
62 | ||
f5cf7aa1 | 63 | static const gdb_byte * |
67d57894 MD |
64 | m68k_local_breakpoint_from_pc (struct gdbarch *gdbarch, |
65 | CORE_ADDR *pcptr, int *lenptr) | |
103a1597 | 66 | { |
f5cf7aa1 | 67 | static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
103a1597 GS |
68 | *lenptr = sizeof (break_insn); |
69 | return break_insn; | |
70 | } | |
4713453b AS |
71 | \f |
72 | ||
73 | /* Type for %ps. */ | |
74 | struct type *m68k_ps_type; | |
75 | ||
76 | /* Construct types for ISA-specific registers. */ | |
77 | static void | |
78 | m68k_init_types (void) | |
79 | { | |
80 | struct type *type; | |
81 | ||
82 | type = init_flags_type ("builtin_type_m68k_ps", 4); | |
83 | append_flags_type_flag (type, 0, "C"); | |
84 | append_flags_type_flag (type, 1, "V"); | |
85 | append_flags_type_flag (type, 2, "Z"); | |
86 | append_flags_type_flag (type, 3, "N"); | |
87 | append_flags_type_flag (type, 4, "X"); | |
88 | append_flags_type_flag (type, 8, "I0"); | |
89 | append_flags_type_flag (type, 9, "I1"); | |
90 | append_flags_type_flag (type, 10, "I2"); | |
91 | append_flags_type_flag (type, 12, "M"); | |
92 | append_flags_type_flag (type, 13, "S"); | |
93 | append_flags_type_flag (type, 14, "T0"); | |
94 | append_flags_type_flag (type, 15, "T1"); | |
95 | m68k_ps_type = type; | |
96 | } | |
103a1597 | 97 | |
d85fe7f7 AS |
98 | /* Return the GDB type object for the "standard" data type of data in |
99 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
100 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
101 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
102 | addresses return pointer to void, not pointer to char, because we | |
103 | don't want to attempt to print the string after printing the | |
104 | address. */ | |
5d3ed2e3 GS |
105 | |
106 | static struct type * | |
8de307e0 | 107 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 108 | { |
c984b7ff | 109 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
03dac896 | 110 | |
8ed86d01 VP |
111 | if (tdep->fpregs_present) |
112 | { | |
c984b7ff UW |
113 | if (regnum >= gdbarch_fp0_regnum (gdbarch) |
114 | && regnum <= gdbarch_fp0_regnum (gdbarch) + 7) | |
8ed86d01 VP |
115 | { |
116 | if (tdep->flavour == m68k_coldfire_flavour) | |
117 | return builtin_type (gdbarch)->builtin_double; | |
118 | else | |
119 | return builtin_type_m68881_ext; | |
120 | } | |
121 | ||
122 | if (regnum == M68K_FPI_REGNUM) | |
123 | return builtin_type_void_func_ptr; | |
124 | ||
125 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) | |
126 | return builtin_type_int32; | |
127 | } | |
128 | else | |
129 | { | |
130 | if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) | |
131 | return builtin_type_int0; | |
132 | } | |
03dac896 | 133 | |
c984b7ff | 134 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
8ed86d01 | 135 | return builtin_type_void_func_ptr; |
03dac896 | 136 | |
32eeb91a | 137 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
138 | return builtin_type_void_data_ptr; |
139 | ||
4713453b AS |
140 | if (regnum == M68K_PS_REGNUM) |
141 | return m68k_ps_type; | |
142 | ||
03dac896 | 143 | return builtin_type_int32; |
5d3ed2e3 GS |
144 | } |
145 | ||
8ed86d01 | 146 | static const char *m68k_register_names[] = { |
5d3ed2e3 GS |
147 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
148 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
149 | "ps", "pc", | |
150 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
8ed86d01 | 151 | "fpcontrol", "fpstatus", "fpiaddr" |
5d3ed2e3 GS |
152 | }; |
153 | ||
8ed86d01 VP |
154 | /* Function: m68k_register_name |
155 | Returns the name of the standard m68k register regnum. */ | |
156 | ||
157 | static const char * | |
d93859e2 | 158 | m68k_register_name (struct gdbarch *gdbarch, int regnum) |
8ed86d01 VP |
159 | { |
160 | if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names)) | |
5d3ed2e3 | 161 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 162 | _("m68k_register_name: illegal register number %d"), regnum); |
5d3ed2e3 | 163 | else |
8ed86d01 | 164 | return m68k_register_names[regnum]; |
5d3ed2e3 | 165 | } |
e47577ab MK |
166 | \f |
167 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
168 | needs any special handling. */ | |
169 | ||
170 | static int | |
0abe36f5 | 171 | m68k_convert_register_p (struct gdbarch *gdbarch, int regnum, struct type *type) |
e47577ab | 172 | { |
0abe36f5 | 173 | if (!gdbarch_tdep (gdbarch)->fpregs_present) |
8ed86d01 | 174 | return 0; |
83acabca DJ |
175 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7 |
176 | && type != builtin_type_m68881_ext); | |
e47577ab MK |
177 | } |
178 | ||
179 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
180 | return its contents in TO. */ | |
181 | ||
182 | static void | |
183 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 184 | struct type *type, gdb_byte *to) |
e47577ab | 185 | { |
f5cf7aa1 | 186 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
187 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
188 | M68K_FP0_REGNUM); | |
e47577ab MK |
189 | |
190 | /* We only support floating-point values. */ | |
191 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
192 | { | |
8a3fe4f8 AC |
193 | warning (_("Cannot convert floating-point register value " |
194 | "to non-floating-point type.")); | |
e47577ab MK |
195 | return; |
196 | } | |
197 | ||
83acabca | 198 | /* Convert to TYPE. */ |
e47577ab | 199 | get_frame_register (frame, regnum, from); |
8ed86d01 | 200 | convert_typed_floating (from, fpreg_type, to, type); |
e47577ab MK |
201 | } |
202 | ||
203 | /* Write the contents FROM of a value of type TYPE into register | |
204 | REGNUM in frame FRAME. */ | |
205 | ||
206 | static void | |
207 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 208 | struct type *type, const gdb_byte *from) |
e47577ab | 209 | { |
f5cf7aa1 | 210 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
211 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
212 | M68K_FP0_REGNUM); | |
e47577ab MK |
213 | |
214 | /* We only support floating-point values. */ | |
215 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
216 | { | |
8a3fe4f8 AC |
217 | warning (_("Cannot convert non-floating-point type " |
218 | "to floating-point register value.")); | |
e47577ab MK |
219 | return; |
220 | } | |
221 | ||
83acabca | 222 | /* Convert from TYPE. */ |
8ed86d01 | 223 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
224 | put_frame_register (frame, regnum, to); |
225 | } | |
226 | ||
8de307e0 | 227 | \f |
f595cb19 MK |
228 | /* There is a fair number of calling conventions that are in somewhat |
229 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
230 | coprocessor. All function return values are stored in %d0/%d1. | |
231 | Structures are returned in a static buffer, a pointer to which is | |
232 | returned in %d0. This means that functions returning a structure | |
233 | are not re-entrant. To avoid this problem some systems use a | |
234 | convention where the caller passes a pointer to a buffer in %a1 | |
235 | where the return values is to be stored. This convention is the | |
236 | default, and is implemented in the function m68k_return_value. | |
237 | ||
238 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
239 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
240 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
241 | psABI. Integer values are returned in %d0/%d1, pointer return | |
242 | values in %a0 and floating values in %fp0. When calling functions | |
243 | returning a structure the caller should pass a pointer to a buffer | |
244 | for the return value in %a0. This convention is implemented in the | |
245 | function m68k_svr4_return_value, and by appropriately setting the | |
246 | struct_value_regnum member of `struct gdbarch_tdep'. | |
247 | ||
248 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
249 | for passing the structure return value buffer. | |
250 | ||
251 | GCC can also generate code where small structures are returned in | |
252 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
253 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
254 | embedded systems. This convention is implemented by setting the | |
255 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
256 | ||
257 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 258 | into VALBUF. */ |
942dc0e9 GS |
259 | |
260 | static void | |
8de307e0 | 261 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 262 | gdb_byte *valbuf) |
942dc0e9 | 263 | { |
8de307e0 | 264 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 265 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 266 | |
8de307e0 AS |
267 | if (len <= 4) |
268 | { | |
269 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
270 | memcpy (valbuf, buf + (4 - len), len); | |
271 | } | |
272 | else if (len <= 8) | |
273 | { | |
274 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
275 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 276 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
277 | } |
278 | else | |
279 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 280 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
281 | } |
282 | ||
942dc0e9 | 283 | static void |
f595cb19 | 284 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 285 | gdb_byte *valbuf) |
942dc0e9 | 286 | { |
8de307e0 | 287 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 288 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
289 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
290 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
942dc0e9 | 291 | |
8ed86d01 | 292 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 293 | { |
c984b7ff | 294 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f595cb19 | 295 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 296 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 297 | } |
f595cb19 MK |
298 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
299 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
300 | else | |
301 | m68k_extract_return_value (type, regcache, valbuf); | |
302 | } | |
303 | ||
304 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
305 | ||
306 | static void | |
307 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 308 | const gdb_byte *valbuf) |
f595cb19 MK |
309 | { |
310 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 311 | |
8de307e0 AS |
312 | if (len <= 4) |
313 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
314 | else if (len <= 8) | |
315 | { | |
f595cb19 | 316 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 317 | len - 4, valbuf); |
f5cf7aa1 | 318 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
319 | } |
320 | else | |
321 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 322 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 323 | } |
942dc0e9 | 324 | |
f595cb19 MK |
325 | static void |
326 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 327 | const gdb_byte *valbuf) |
942dc0e9 | 328 | { |
f595cb19 | 329 | int len = TYPE_LENGTH (type); |
c984b7ff UW |
330 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
331 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
8de307e0 | 332 | |
8ed86d01 | 333 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 334 | { |
c984b7ff | 335 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f5cf7aa1 | 336 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 337 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
338 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
339 | } | |
340 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
341 | { | |
342 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
343 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
344 | } | |
345 | else | |
346 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
347 | } |
348 | ||
f595cb19 MK |
349 | /* Return non-zero if TYPE, which is assumed to be a structure or |
350 | union type, should be returned in registers for architecture | |
351 | GDBARCH. */ | |
352 | ||
c481dac7 | 353 | static int |
f595cb19 | 354 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 355 | { |
f595cb19 MK |
356 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
357 | enum type_code code = TYPE_CODE (type); | |
358 | int len = TYPE_LENGTH (type); | |
c481dac7 | 359 | |
f595cb19 MK |
360 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
361 | ||
362 | if (tdep->struct_return == pcc_struct_return) | |
363 | return 0; | |
364 | ||
365 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
366 | } |
367 | ||
f595cb19 MK |
368 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
369 | should be returned. If it is supposed to be returned in registers, | |
370 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
371 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
372 | from WRITEBUF into REGCACHE. */ | |
373 | ||
374 | static enum return_value_convention | |
375 | m68k_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
376 | struct regcache *regcache, gdb_byte *readbuf, |
377 | const gdb_byte *writebuf) | |
f595cb19 MK |
378 | { |
379 | enum type_code code = TYPE_CODE (type); | |
380 | ||
1c845060 MK |
381 | /* GCC returns a `long double' in memory too. */ |
382 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
383 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
384 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
385 | { | |
386 | /* The default on m68k is to return structures in static memory. | |
387 | Consequently a function must return the address where we can | |
388 | find the return value. */ | |
f595cb19 | 389 | |
1c845060 MK |
390 | if (readbuf) |
391 | { | |
392 | ULONGEST addr; | |
393 | ||
394 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
395 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
396 | } | |
397 | ||
398 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
399 | } | |
f595cb19 MK |
400 | |
401 | if (readbuf) | |
402 | m68k_extract_return_value (type, regcache, readbuf); | |
403 | if (writebuf) | |
404 | m68k_store_return_value (type, regcache, writebuf); | |
405 | ||
406 | return RETURN_VALUE_REGISTER_CONVENTION; | |
407 | } | |
408 | ||
409 | static enum return_value_convention | |
410 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
411 | struct regcache *regcache, gdb_byte *readbuf, |
412 | const gdb_byte *writebuf) | |
f595cb19 MK |
413 | { |
414 | enum type_code code = TYPE_CODE (type); | |
415 | ||
416 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
417 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
418 | { |
419 | /* The System V ABI says that: | |
420 | ||
421 | "A function returning a structure or union also sets %a0 to | |
422 | the value it finds in %a0. Thus when the caller receives | |
423 | control again, the address of the returned object resides in | |
424 | register %a0." | |
425 | ||
426 | So the ABI guarantees that we can always find the return | |
427 | value just after the function has returned. */ | |
428 | ||
429 | if (readbuf) | |
430 | { | |
431 | ULONGEST addr; | |
432 | ||
433 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
434 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
435 | } | |
436 | ||
437 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
438 | } | |
f595cb19 MK |
439 | |
440 | /* This special case is for structures consisting of a single | |
441 | `float' or `double' member. These structures are returned in | |
442 | %fp0. For these structures, we call ourselves recursively, | |
443 | changing TYPE into the type of the first member of the structure. | |
444 | Since that should work for all structures that have only one | |
445 | member, we don't bother to check the member's type here. */ | |
446 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
447 | { | |
448 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
449 | return m68k_svr4_return_value (gdbarch, type, regcache, | |
450 | readbuf, writebuf); | |
451 | } | |
452 | ||
453 | if (readbuf) | |
454 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
455 | if (writebuf) | |
456 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
457 | ||
458 | return RETURN_VALUE_REGISTER_CONVENTION; | |
459 | } | |
460 | \f | |
392a587b | 461 | |
9bb47d95 NS |
462 | /* Always align the frame to a 4-byte boundary. This is required on |
463 | coldfire and harmless on the rest. */ | |
464 | ||
465 | static CORE_ADDR | |
466 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
467 | { | |
468 | /* Align the stack to four bytes. */ | |
469 | return sp & ~3; | |
470 | } | |
471 | ||
8de307e0 | 472 | static CORE_ADDR |
7d9b040b | 473 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
474 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
475 | struct value **args, CORE_ADDR sp, int struct_return, | |
476 | CORE_ADDR struct_addr) | |
7f8e7424 | 477 | { |
f595cb19 | 478 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
f5cf7aa1 | 479 | gdb_byte buf[4]; |
8de307e0 AS |
480 | int i; |
481 | ||
482 | /* Push arguments in reverse order. */ | |
483 | for (i = nargs - 1; i >= 0; i--) | |
484 | { | |
4754a64e | 485 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 486 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 487 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
488 | int offset; |
489 | ||
490 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
491 | right aligned. */ | |
492 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
493 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
494 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
495 | && len > 4) | |
496 | offset = 0; | |
497 | else | |
498 | offset = container_len - len; | |
8de307e0 | 499 | sp -= container_len; |
46615f07 | 500 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
501 | } |
502 | ||
c481dac7 | 503 | /* Store struct value address. */ |
8de307e0 AS |
504 | if (struct_return) |
505 | { | |
8de307e0 | 506 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 507 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
508 | } |
509 | ||
510 | /* Store return address. */ | |
511 | sp -= 4; | |
512 | store_unsigned_integer (buf, 4, bp_addr); | |
513 | write_memory (sp, buf, 4); | |
514 | ||
515 | /* Finally, update the stack pointer... */ | |
516 | store_unsigned_integer (buf, 4, sp); | |
517 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
518 | ||
519 | /* ...and fake a frame pointer. */ | |
520 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
521 | ||
522 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
523 | frame's CFA. */ | |
524 | return sp + 8; | |
7f8e7424 | 525 | } |
6dd0fba6 NS |
526 | |
527 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
528 | ||
529 | static int | |
d3f73121 | 530 | m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
6dd0fba6 NS |
531 | { |
532 | if (num < 8) | |
533 | /* d0..7 */ | |
534 | return (num - 0) + M68K_D0_REGNUM; | |
535 | else if (num < 16) | |
536 | /* a0..7 */ | |
537 | return (num - 8) + M68K_A0_REGNUM; | |
d3f73121 | 538 | else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present) |
6dd0fba6 NS |
539 | /* fp0..7 */ |
540 | return (num - 16) + M68K_FP0_REGNUM; | |
541 | else if (num == 25) | |
542 | /* pc */ | |
543 | return M68K_PC_REGNUM; | |
544 | else | |
d3f73121 | 545 | return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
6dd0fba6 NS |
546 | } |
547 | ||
8de307e0 AS |
548 | \f |
549 | struct m68k_frame_cache | |
550 | { | |
551 | /* Base address. */ | |
552 | CORE_ADDR base; | |
553 | CORE_ADDR sp_offset; | |
554 | CORE_ADDR pc; | |
7f8e7424 | 555 | |
8de307e0 AS |
556 | /* Saved registers. */ |
557 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
558 | CORE_ADDR saved_sp; | |
7f8e7424 | 559 | |
8de307e0 AS |
560 | /* Stack space reserved for local variables. */ |
561 | long locals; | |
562 | }; | |
c906108c | 563 | |
8de307e0 AS |
564 | /* Allocate and initialize a frame cache. */ |
565 | ||
566 | static struct m68k_frame_cache * | |
567 | m68k_alloc_frame_cache (void) | |
c906108c | 568 | { |
8de307e0 AS |
569 | struct m68k_frame_cache *cache; |
570 | int i; | |
c906108c | 571 | |
8de307e0 | 572 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 573 | |
8de307e0 AS |
574 | /* Base address. */ |
575 | cache->base = 0; | |
576 | cache->sp_offset = -4; | |
577 | cache->pc = 0; | |
c906108c | 578 | |
8de307e0 AS |
579 | /* Saved registers. We initialize these to -1 since zero is a valid |
580 | offset (that's where %fp is supposed to be stored). */ | |
581 | for (i = 0; i < M68K_NUM_REGS; i++) | |
582 | cache->saved_regs[i] = -1; | |
583 | ||
584 | /* Frameless until proven otherwise. */ | |
585 | cache->locals = -1; | |
586 | ||
587 | return cache; | |
c906108c SS |
588 | } |
589 | ||
8de307e0 AS |
590 | /* Check whether PC points at a code that sets up a new stack frame. |
591 | If so, it updates CACHE and returns the address of the first | |
592 | instruction after the sequence that sets removes the "hidden" | |
593 | argument from the stack or CURRENT_PC, whichever is smaller. | |
594 | Otherwise, return PC. */ | |
c906108c | 595 | |
8de307e0 AS |
596 | static CORE_ADDR |
597 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
598 | struct m68k_frame_cache *cache) | |
c906108c | 599 | { |
8de307e0 AS |
600 | int op; |
601 | ||
602 | if (pc >= current_pc) | |
603 | return current_pc; | |
c906108c | 604 | |
8de307e0 AS |
605 | op = read_memory_unsigned_integer (pc, 2); |
606 | ||
607 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 608 | { |
8de307e0 AS |
609 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
610 | cache->sp_offset += 4; | |
611 | if (op == P_LINKW_FP) | |
612 | { | |
613 | /* link.w %fp, #-N */ | |
614 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
615 | cache->locals = -read_memory_integer (pc + 2, 2); | |
616 | ||
617 | if (pc + 4 < current_pc && cache->locals == 0) | |
618 | { | |
619 | op = read_memory_unsigned_integer (pc + 4, 2); | |
620 | if (op == P_ADDAL_SP) | |
621 | { | |
622 | cache->locals = read_memory_integer (pc + 6, 4); | |
623 | return pc + 10; | |
624 | } | |
625 | } | |
626 | ||
627 | return pc + 4; | |
628 | } | |
629 | else if (op == P_LINKL_FP) | |
c906108c | 630 | { |
8de307e0 AS |
631 | /* link.l %fp, #-N */ |
632 | cache->locals = -read_memory_integer (pc + 2, 4); | |
633 | return pc + 6; | |
634 | } | |
635 | else | |
636 | { | |
637 | /* pea (%fp); movea.l %sp, %fp */ | |
638 | cache->locals = 0; | |
639 | ||
640 | if (pc + 2 < current_pc) | |
641 | { | |
642 | op = read_memory_unsigned_integer (pc + 2, 2); | |
643 | ||
644 | if (op == P_MOVEAL_SP_FP) | |
645 | { | |
646 | /* move.l %sp, %fp */ | |
647 | return pc + 4; | |
648 | } | |
649 | } | |
650 | ||
651 | return pc + 2; | |
c906108c SS |
652 | } |
653 | } | |
8de307e0 | 654 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 655 | { |
8de307e0 AS |
656 | /* subq.[wl] #N,%sp */ |
657 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
658 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
659 | if (pc + 2 < current_pc) | |
c906108c | 660 | { |
8de307e0 AS |
661 | op = read_memory_unsigned_integer (pc + 2, 2); |
662 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
663 | { | |
664 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
665 | return pc + 4; | |
666 | } | |
c906108c | 667 | } |
8de307e0 AS |
668 | return pc + 2; |
669 | } | |
670 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
671 | { | |
672 | /* adda.w #-N,%sp */ | |
673 | /* lea (-N,%sp),%sp */ | |
674 | cache->locals = -read_memory_integer (pc + 2, 2); | |
675 | return pc + 4; | |
c906108c | 676 | } |
8de307e0 | 677 | else if (op == P_ADDAL_SP) |
c906108c | 678 | { |
8de307e0 AS |
679 | /* adda.l #-N,%sp */ |
680 | cache->locals = -read_memory_integer (pc + 2, 4); | |
681 | return pc + 6; | |
c906108c | 682 | } |
8de307e0 AS |
683 | |
684 | return pc; | |
c906108c | 685 | } |
c5aa993b | 686 | |
8de307e0 AS |
687 | /* Check whether PC points at code that saves registers on the stack. |
688 | If so, it updates CACHE and returns the address of the first | |
689 | instruction after the register saves or CURRENT_PC, whichever is | |
690 | smaller. Otherwise, return PC. */ | |
c906108c | 691 | |
8de307e0 AS |
692 | static CORE_ADDR |
693 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
694 | struct m68k_frame_cache *cache) | |
695 | { | |
696 | if (cache->locals >= 0) | |
697 | { | |
698 | CORE_ADDR offset; | |
699 | int op; | |
700 | int i, mask, regno; | |
c906108c | 701 | |
8de307e0 AS |
702 | offset = -4 - cache->locals; |
703 | while (pc < current_pc) | |
704 | { | |
705 | op = read_memory_unsigned_integer (pc, 2); | |
8ed86d01 VP |
706 | if (op == P_FMOVEMX_SP |
707 | && gdbarch_tdep (current_gdbarch)->fpregs_present) | |
8de307e0 AS |
708 | { |
709 | /* fmovem.x REGS,-(%sp) */ | |
710 | op = read_memory_unsigned_integer (pc + 2, 2); | |
711 | if ((op & 0xff00) == 0xe000) | |
712 | { | |
713 | mask = op & 0xff; | |
714 | for (i = 0; i < 16; i++, mask >>= 1) | |
715 | { | |
716 | if (mask & 1) | |
717 | { | |
718 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
719 | offset -= 12; | |
720 | } | |
721 | } | |
722 | pc += 4; | |
723 | } | |
724 | else | |
725 | break; | |
726 | } | |
0ba5a932 | 727 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
728 | { |
729 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 730 | regno = op & 017; |
8de307e0 AS |
731 | cache->saved_regs[regno] = offset; |
732 | offset -= 4; | |
733 | pc += 2; | |
734 | } | |
735 | else if (op == P_MOVEML_SP) | |
736 | { | |
737 | /* movem.l REGS,-(%sp) */ | |
738 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
739 | for (i = 0; i < 16; i++, mask >>= 1) | |
740 | { | |
741 | if (mask & 1) | |
742 | { | |
743 | cache->saved_regs[15 - i] = offset; | |
744 | offset -= 4; | |
745 | } | |
746 | } | |
747 | pc += 4; | |
748 | } | |
749 | else | |
750 | break; | |
751 | } | |
752 | } | |
753 | ||
754 | return pc; | |
755 | } | |
c906108c | 756 | |
c906108c | 757 | |
8de307e0 AS |
758 | /* Do a full analysis of the prologue at PC and update CACHE |
759 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
760 | address where the analysis stopped. | |
c906108c | 761 | |
8de307e0 | 762 | We handle all cases that can be generated by gcc. |
c906108c | 763 | |
8de307e0 | 764 | For allocating a stack frame: |
c906108c | 765 | |
8de307e0 AS |
766 | link.w %a6,#-N |
767 | link.l %a6,#-N | |
768 | pea (%fp); move.l %sp,%fp | |
769 | link.w %a6,#0; add.l #-N,%sp | |
770 | subq.l #N,%sp | |
771 | subq.w #N,%sp | |
772 | subq.w #8,%sp; subq.w #N-8,%sp | |
773 | add.w #-N,%sp | |
774 | lea (-N,%sp),%sp | |
775 | add.l #-N,%sp | |
c906108c | 776 | |
8de307e0 | 777 | For saving registers: |
c906108c | 778 | |
8de307e0 AS |
779 | fmovem.x REGS,-(%sp) |
780 | move.l R1,-(%sp) | |
781 | move.l R1,-(%sp); move.l R2,-(%sp) | |
782 | movem.l REGS,-(%sp) | |
c906108c | 783 | |
8de307e0 | 784 | For setting up the PIC register: |
c906108c | 785 | |
8de307e0 | 786 | lea (%pc,N),%a5 |
c906108c | 787 | |
8de307e0 | 788 | */ |
c906108c | 789 | |
eb2e12d7 | 790 | static CORE_ADDR |
8de307e0 AS |
791 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
792 | struct m68k_frame_cache *cache) | |
c906108c | 793 | { |
8de307e0 | 794 | unsigned int op; |
c906108c | 795 | |
8de307e0 AS |
796 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
797 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
798 | if (pc >= current_pc) | |
799 | return current_pc; | |
c906108c | 800 | |
8de307e0 AS |
801 | /* Check for GOT setup. */ |
802 | op = read_memory_unsigned_integer (pc, 4); | |
803 | if (op == P_LEA_PC_A5) | |
c906108c | 804 | { |
8de307e0 AS |
805 | /* lea (%pc,N),%a5 */ |
806 | return pc + 6; | |
c906108c | 807 | } |
8de307e0 AS |
808 | |
809 | return pc; | |
c906108c SS |
810 | } |
811 | ||
8de307e0 | 812 | /* Return PC of first real instruction. */ |
7f8e7424 | 813 | |
8de307e0 AS |
814 | static CORE_ADDR |
815 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 816 | { |
8de307e0 AS |
817 | struct m68k_frame_cache cache; |
818 | CORE_ADDR pc; | |
819 | int op; | |
c906108c | 820 | |
8de307e0 AS |
821 | cache.locals = -1; |
822 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
823 | if (cache.locals < 0) | |
824 | return start_pc; | |
825 | return pc; | |
826 | } | |
c906108c | 827 | |
8de307e0 AS |
828 | static CORE_ADDR |
829 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
830 | { | |
f5cf7aa1 | 831 | gdb_byte buf[8]; |
7f8e7424 | 832 | |
c984b7ff | 833 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
8de307e0 AS |
834 | return extract_typed_address (buf, builtin_type_void_func_ptr); |
835 | } | |
836 | \f | |
837 | /* Normal frames. */ | |
7f8e7424 | 838 | |
8de307e0 AS |
839 | static struct m68k_frame_cache * |
840 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
841 | { | |
842 | struct m68k_frame_cache *cache; | |
f5cf7aa1 | 843 | gdb_byte buf[4]; |
8de307e0 AS |
844 | int i; |
845 | ||
846 | if (*this_cache) | |
847 | return *this_cache; | |
848 | ||
849 | cache = m68k_alloc_frame_cache (); | |
850 | *this_cache = cache; | |
851 | ||
852 | /* In principle, for normal frames, %fp holds the frame pointer, | |
853 | which holds the base address for the current stack frame. | |
854 | However, for functions that don't need it, the frame pointer is | |
855 | optional. For these "frameless" functions the frame pointer is | |
856 | actually the frame pointer of the calling frame. Signal | |
857 | trampolines are just a special case of a "frameless" function. | |
858 | They (usually) share their frame pointer with the frame that was | |
859 | in progress when the signal occurred. */ | |
860 | ||
861 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
862 | cache->base = extract_unsigned_integer (buf, 4); | |
863 | if (cache->base == 0) | |
864 | return cache; | |
865 | ||
866 | /* For normal frames, %pc is stored at 4(%fp). */ | |
867 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
868 | ||
93d42b30 | 869 | cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME); |
8de307e0 AS |
870 | if (cache->pc != 0) |
871 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
872 | ||
873 | if (cache->locals < 0) | |
874 | { | |
875 | /* We didn't find a valid frame, which means that CACHE->base | |
876 | currently holds the frame pointer for our calling frame. If | |
877 | we're at the start of a function, or somewhere half-way its | |
878 | prologue, the function's frame probably hasn't been fully | |
879 | setup yet. Try to reconstruct the base address for the stack | |
880 | frame by looking at the stack pointer. For truly "frameless" | |
881 | functions this might work too. */ | |
882 | ||
883 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
884 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
885 | } | |
7f8e7424 | 886 | |
8de307e0 AS |
887 | /* Now that we have the base address for the stack frame we can |
888 | calculate the value of %sp in the calling frame. */ | |
889 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 890 | |
8de307e0 AS |
891 | /* Adjust all the saved registers such that they contain addresses |
892 | instead of offsets. */ | |
893 | for (i = 0; i < M68K_NUM_REGS; i++) | |
894 | if (cache->saved_regs[i] != -1) | |
895 | cache->saved_regs[i] += cache->base; | |
c906108c | 896 | |
8de307e0 AS |
897 | return cache; |
898 | } | |
c906108c | 899 | |
8de307e0 AS |
900 | static void |
901 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
902 | struct frame_id *this_id) | |
903 | { | |
904 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 905 | |
8de307e0 AS |
906 | /* This marks the outermost frame. */ |
907 | if (cache->base == 0) | |
908 | return; | |
c5aa993b | 909 | |
8de307e0 AS |
910 | /* See the end of m68k_push_dummy_call. */ |
911 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
912 | } | |
c5aa993b | 913 | |
8de307e0 AS |
914 | static void |
915 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
916 | int regnum, int *optimizedp, | |
917 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
60b04da5 | 918 | int *realnump, gdb_byte *valuep) |
8de307e0 AS |
919 | { |
920 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
921 | ||
922 | gdb_assert (regnum >= 0); | |
923 | ||
924 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 925 | { |
8de307e0 AS |
926 | *optimizedp = 0; |
927 | *lvalp = not_lval; | |
928 | *addrp = 0; | |
929 | *realnump = -1; | |
930 | if (valuep) | |
c906108c | 931 | { |
8de307e0 AS |
932 | /* Store the value. */ |
933 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 934 | } |
8de307e0 AS |
935 | return; |
936 | } | |
937 | ||
938 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
939 | { | |
940 | *optimizedp = 0; | |
941 | *lvalp = lval_memory; | |
942 | *addrp = cache->saved_regs[regnum]; | |
943 | *realnump = -1; | |
944 | if (valuep) | |
89c3b6d3 | 945 | { |
8de307e0 AS |
946 | /* Read the value in from memory. */ |
947 | read_memory (*addrp, valuep, | |
c984b7ff | 948 | register_size (get_frame_arch (next_frame), regnum)); |
89c3b6d3 | 949 | } |
8de307e0 | 950 | return; |
c906108c | 951 | } |
8de307e0 | 952 | |
00b25ff3 AC |
953 | *optimizedp = 0; |
954 | *lvalp = lval_register; | |
955 | *addrp = 0; | |
956 | *realnump = regnum; | |
957 | if (valuep) | |
958 | frame_unwind_register (next_frame, (*realnump), valuep); | |
8de307e0 AS |
959 | } |
960 | ||
961 | static const struct frame_unwind m68k_frame_unwind = | |
962 | { | |
963 | NORMAL_FRAME, | |
964 | m68k_frame_this_id, | |
965 | m68k_frame_prev_register | |
966 | }; | |
967 | ||
968 | static const struct frame_unwind * | |
336d1bba | 969 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
970 | { |
971 | return &m68k_frame_unwind; | |
972 | } | |
973 | \f | |
8de307e0 AS |
974 | static CORE_ADDR |
975 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
976 | { | |
977 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
978 | ||
979 | return cache->base; | |
980 | } | |
981 | ||
982 | static const struct frame_base m68k_frame_base = | |
983 | { | |
984 | &m68k_frame_unwind, | |
985 | m68k_frame_base_address, | |
986 | m68k_frame_base_address, | |
987 | m68k_frame_base_address | |
988 | }; | |
989 | ||
990 | static struct frame_id | |
991 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
992 | { | |
f5cf7aa1 | 993 | gdb_byte buf[4]; |
8de307e0 | 994 | CORE_ADDR fp; |
c906108c | 995 | |
8de307e0 AS |
996 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
997 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 998 | |
8de307e0 AS |
999 | /* See the end of m68k_push_dummy_call. */ |
1000 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
1001 | } | |
1002 | \f | |
c906108c | 1003 | |
c906108c SS |
1004 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1005 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1006 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
1007 | This routine returns true on success. */ | |
1008 | ||
c34d127c | 1009 | static int |
60ade65d | 1010 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 1011 | { |
f5cf7aa1 | 1012 | gdb_byte *buf; |
c906108c | 1013 | CORE_ADDR sp, jb_addr; |
c984b7ff | 1014 | struct gdbarch *gdbarch = get_frame_arch (frame); |
60ade65d | 1015 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
eb2e12d7 AS |
1016 | |
1017 | if (tdep->jb_pc < 0) | |
1018 | { | |
1019 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1020 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1021 | return 0; |
1022 | } | |
c906108c | 1023 | |
c984b7ff UW |
1024 | buf = alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
1025 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); | |
c906108c | 1026 | |
b5d78d39 | 1027 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
c984b7ff | 1028 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1029 | return 0; |
1030 | ||
c984b7ff | 1031 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
819844ad | 1032 | / TARGET_CHAR_BIT); |
c906108c | 1033 | |
eb2e12d7 | 1034 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c984b7ff | 1035 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1036 | return 0; |
1037 | ||
c984b7ff | 1038 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
819844ad | 1039 | / TARGET_CHAR_BIT); |
c906108c SS |
1040 | return 1; |
1041 | } | |
f595cb19 MK |
1042 | \f |
1043 | ||
1044 | /* System V Release 4 (SVR4). */ | |
1045 | ||
1046 | void | |
1047 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1048 | { | |
1049 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1050 | ||
1051 | /* SVR4 uses a different calling convention. */ | |
1052 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1053 | ||
1054 | /* SVR4 uses %a0 instead of %a1. */ | |
1055 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1056 | } | |
1057 | \f | |
c906108c | 1058 | |
152d9db6 GS |
1059 | /* Function: m68k_gdbarch_init |
1060 | Initializer function for the m68k gdbarch vector. | |
1061 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1062 | ||
1063 | static struct gdbarch * | |
1064 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1065 | { | |
1066 | struct gdbarch_tdep *tdep = NULL; | |
1067 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1068 | struct gdbarch_list *best_arch; |
1069 | struct tdesc_arch_data *tdesc_data = NULL; | |
1070 | int i; | |
1071 | enum m68k_flavour flavour = m68k_no_flavour; | |
1072 | int has_fp = 1; | |
1073 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1074 | ||
1075 | /* Check any target description for validity. */ | |
1076 | if (tdesc_has_registers (info.target_desc)) | |
1077 | { | |
1078 | const struct tdesc_feature *feature; | |
1079 | int valid_p; | |
152d9db6 | 1080 | |
8ed86d01 VP |
1081 | feature = tdesc_find_feature (info.target_desc, |
1082 | "org.gnu.gdb.m68k.core"); | |
1083 | if (feature != NULL) | |
1084 | /* Do nothing. */ | |
1085 | ; | |
1086 | ||
1087 | if (feature == NULL) | |
1088 | { | |
1089 | feature = tdesc_find_feature (info.target_desc, | |
1090 | "org.gnu.gdb.coldfire.core"); | |
1091 | if (feature != NULL) | |
1092 | flavour = m68k_coldfire_flavour; | |
1093 | } | |
1094 | ||
1095 | if (feature == NULL) | |
1096 | { | |
1097 | feature = tdesc_find_feature (info.target_desc, | |
1098 | "org.gnu.gdb.fido.core"); | |
1099 | if (feature != NULL) | |
1100 | flavour = m68k_fido_flavour; | |
1101 | } | |
1102 | ||
1103 | if (feature == NULL) | |
1104 | return NULL; | |
1105 | ||
1106 | tdesc_data = tdesc_data_alloc (); | |
1107 | ||
1108 | valid_p = 1; | |
1109 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1110 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1111 | m68k_register_names[i]); | |
1112 | ||
1113 | if (!valid_p) | |
1114 | { | |
1115 | tdesc_data_cleanup (tdesc_data); | |
1116 | return NULL; | |
1117 | } | |
1118 | ||
1119 | feature = tdesc_find_feature (info.target_desc, | |
1120 | "org.gnu.gdb.coldfire.fp"); | |
1121 | if (feature != NULL) | |
1122 | { | |
1123 | valid_p = 1; | |
1124 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1125 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1126 | m68k_register_names[i]); | |
1127 | if (!valid_p) | |
1128 | { | |
1129 | tdesc_data_cleanup (tdesc_data); | |
1130 | return NULL; | |
1131 | } | |
1132 | } | |
1133 | else | |
1134 | has_fp = 0; | |
1135 | } | |
1136 | ||
1137 | /* The mechanism for returning floating values from function | |
1138 | and the type of long double depend on whether we're | |
1139 | on ColdFire or standard m68k. */ | |
1140 | ||
4ed77933 | 1141 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1142 | { |
1143 | const bfd_arch_info_type *coldfire_arch = | |
1144 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1145 | ||
1146 | if (coldfire_arch | |
4ed77933 AS |
1147 | && ((*info.bfd_arch_info->compatible) |
1148 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1149 | flavour = m68k_coldfire_flavour; |
1150 | } | |
1151 | ||
1152 | /* If there is already a candidate, use it. */ | |
1153 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1154 | best_arch != NULL; | |
1155 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1156 | { | |
1157 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1158 | continue; | |
1159 | ||
1160 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1161 | continue; | |
1162 | ||
1163 | break; | |
1164 | } | |
152d9db6 | 1165 | |
eb2e12d7 AS |
1166 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1167 | gdbarch = gdbarch_alloc (&info, tdep); | |
8ed86d01 VP |
1168 | tdep->fpregs_present = has_fp; |
1169 | tdep->flavour = flavour; | |
152d9db6 | 1170 | |
8ed86d01 VP |
1171 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1172 | long_double_format = floatformats_ieee_double; | |
1173 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1174 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1175 | |
5d3ed2e3 | 1176 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1177 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1178 | |
1179 | /* Stack grows down. */ | |
1180 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
9bb47d95 | 1181 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1182 | |
1183 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1184 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1185 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1186 | |
6300c360 | 1187 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 NS |
1188 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
1189 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); | |
942dc0e9 | 1190 | |
8de307e0 | 1191 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1192 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1193 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1194 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1195 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1196 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1197 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
e47577ab MK |
1198 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1199 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1200 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1201 | |
8ed86d01 VP |
1202 | if (has_fp) |
1203 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1204 | ||
1205 | /* Try to figure out if the arch uses floating registers to return | |
1206 | floating point values from functions. */ | |
1207 | if (has_fp) | |
1208 | { | |
1209 | /* On ColdFire, floating point values are returned in D0. */ | |
1210 | if (flavour == m68k_coldfire_flavour) | |
1211 | tdep->float_return = 0; | |
1212 | else | |
1213 | tdep->float_return = 1; | |
1214 | } | |
1215 | else | |
1216 | { | |
1217 | /* No floating registers, so can't use them for returning values. */ | |
1218 | tdep->float_return = 0; | |
1219 | } | |
1220 | ||
1221 | /* Function call & return */ | |
8de307e0 | 1222 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1223 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1224 | |
8ed86d01 | 1225 | |
650fcc91 AS |
1226 | /* Disassembler. */ |
1227 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1228 | ||
eb2e12d7 AS |
1229 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1230 | tdep->jb_pc = JB_PC; | |
1231 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1232 | #else | |
1233 | tdep->jb_pc = -1; | |
1234 | #endif | |
f595cb19 | 1235 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1236 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1237 | |
1238 | /* Frame unwinder. */ | |
1239 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1240 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1241 | |
1242 | /* Hook in the DWARF CFI frame unwinder. */ | |
1243 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1244 | ||
8de307e0 | 1245 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1246 | |
55809acb AS |
1247 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1248 | gdbarch_init_osabi (info, gdbarch); | |
1249 | ||
eb2e12d7 AS |
1250 | /* Now we have tuned the configuration, set a few final things, |
1251 | based on what the OS ABI has told us. */ | |
1252 | ||
1253 | if (tdep->jb_pc >= 0) | |
1254 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1255 | ||
336d1bba | 1256 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1257 | |
8ed86d01 | 1258 | if (tdesc_data) |
7cc46491 | 1259 | tdesc_use_registers (gdbarch, info.target_desc, tdesc_data); |
8ed86d01 | 1260 | |
152d9db6 GS |
1261 | return gdbarch; |
1262 | } | |
1263 | ||
1264 | ||
1265 | static void | |
c984b7ff | 1266 | m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
152d9db6 | 1267 | { |
c984b7ff | 1268 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
152d9db6 | 1269 | |
eb2e12d7 AS |
1270 | if (tdep == NULL) |
1271 | return; | |
152d9db6 | 1272 | } |
2acceee2 | 1273 | |
a78f21af AC |
1274 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1275 | ||
c906108c | 1276 | void |
fba45db2 | 1277 | _initialize_m68k_tdep (void) |
c906108c | 1278 | { |
152d9db6 | 1279 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
4713453b AS |
1280 | |
1281 | /* Initialize the m68k-specific register types. */ | |
1282 | m68k_init_types (); | |
c906108c | 1283 | } |