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 | |
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 * |
103a1597 GS |
64 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
65 | { | |
f5cf7aa1 | 66 | static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
103a1597 GS |
67 | *lenptr = sizeof (break_insn); |
68 | return break_insn; | |
69 | } | |
4713453b AS |
70 | \f |
71 | ||
72 | /* Type for %ps. */ | |
73 | struct type *m68k_ps_type; | |
74 | ||
75 | /* Construct types for ISA-specific registers. */ | |
76 | static void | |
77 | m68k_init_types (void) | |
78 | { | |
79 | struct type *type; | |
80 | ||
81 | type = init_flags_type ("builtin_type_m68k_ps", 4); | |
82 | append_flags_type_flag (type, 0, "C"); | |
83 | append_flags_type_flag (type, 1, "V"); | |
84 | append_flags_type_flag (type, 2, "Z"); | |
85 | append_flags_type_flag (type, 3, "N"); | |
86 | append_flags_type_flag (type, 4, "X"); | |
87 | append_flags_type_flag (type, 8, "I0"); | |
88 | append_flags_type_flag (type, 9, "I1"); | |
89 | append_flags_type_flag (type, 10, "I2"); | |
90 | append_flags_type_flag (type, 12, "M"); | |
91 | append_flags_type_flag (type, 13, "S"); | |
92 | append_flags_type_flag (type, 14, "T0"); | |
93 | append_flags_type_flag (type, 15, "T1"); | |
94 | m68k_ps_type = type; | |
95 | } | |
103a1597 | 96 | |
d85fe7f7 AS |
97 | /* Return the GDB type object for the "standard" data type of data in |
98 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
99 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
100 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
101 | addresses return pointer to void, not pointer to char, because we | |
102 | don't want to attempt to print the string after printing the | |
103 | address. */ | |
5d3ed2e3 GS |
104 | |
105 | static struct type * | |
8de307e0 | 106 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 107 | { |
8ed86d01 | 108 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
03dac896 | 109 | |
8ed86d01 VP |
110 | if (tdep->fpregs_present) |
111 | { | |
3e8c568d UW |
112 | if (regnum >= gdbarch_fp0_regnum (current_gdbarch) |
113 | && regnum <= gdbarch_fp0_regnum (current_gdbarch) + 7) | |
8ed86d01 VP |
114 | { |
115 | if (tdep->flavour == m68k_coldfire_flavour) | |
116 | return builtin_type (gdbarch)->builtin_double; | |
117 | else | |
118 | return builtin_type_m68881_ext; | |
119 | } | |
120 | ||
121 | if (regnum == M68K_FPI_REGNUM) | |
122 | return builtin_type_void_func_ptr; | |
123 | ||
124 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) | |
125 | return builtin_type_int32; | |
126 | } | |
127 | else | |
128 | { | |
129 | if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) | |
130 | return builtin_type_int0; | |
131 | } | |
03dac896 | 132 | |
3e8c568d | 133 | if (regnum == gdbarch_pc_regnum (current_gdbarch)) |
8ed86d01 | 134 | return builtin_type_void_func_ptr; |
03dac896 | 135 | |
32eeb91a | 136 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
137 | return builtin_type_void_data_ptr; |
138 | ||
4713453b AS |
139 | if (regnum == M68K_PS_REGNUM) |
140 | return m68k_ps_type; | |
141 | ||
03dac896 | 142 | return builtin_type_int32; |
5d3ed2e3 GS |
143 | } |
144 | ||
8ed86d01 | 145 | static const char *m68k_register_names[] = { |
5d3ed2e3 GS |
146 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
147 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
148 | "ps", "pc", | |
149 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
8ed86d01 | 150 | "fpcontrol", "fpstatus", "fpiaddr" |
5d3ed2e3 GS |
151 | }; |
152 | ||
8ed86d01 VP |
153 | /* Function: m68k_register_name |
154 | Returns the name of the standard m68k register regnum. */ | |
155 | ||
156 | static const char * | |
157 | m68k_register_name (int regnum) | |
158 | { | |
159 | if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names)) | |
5d3ed2e3 | 160 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 161 | _("m68k_register_name: illegal register number %d"), regnum); |
5d3ed2e3 | 162 | else |
8ed86d01 | 163 | return m68k_register_names[regnum]; |
5d3ed2e3 | 164 | } |
e47577ab MK |
165 | \f |
166 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
167 | needs any special handling. */ | |
168 | ||
169 | static int | |
170 | m68k_convert_register_p (int regnum, struct type *type) | |
171 | { | |
8ed86d01 VP |
172 | if (!gdbarch_tdep (current_gdbarch)->fpregs_present) |
173 | return 0; | |
e47577ab MK |
174 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7); |
175 | } | |
176 | ||
177 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
178 | return its contents in TO. */ | |
179 | ||
180 | static void | |
181 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 182 | struct type *type, gdb_byte *to) |
e47577ab | 183 | { |
f5cf7aa1 | 184 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 185 | struct type *fpreg_type = register_type (current_gdbarch, M68K_FP0_REGNUM); |
e47577ab MK |
186 | |
187 | /* We only support floating-point values. */ | |
188 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
189 | { | |
8a3fe4f8 AC |
190 | warning (_("Cannot convert floating-point register value " |
191 | "to non-floating-point type.")); | |
e47577ab MK |
192 | return; |
193 | } | |
194 | ||
195 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to | |
196 | the extended floating-point format used by the FPU. */ | |
197 | get_frame_register (frame, regnum, from); | |
8ed86d01 | 198 | convert_typed_floating (from, fpreg_type, to, type); |
e47577ab MK |
199 | } |
200 | ||
201 | /* Write the contents FROM of a value of type TYPE into register | |
202 | REGNUM in frame FRAME. */ | |
203 | ||
204 | static void | |
205 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 206 | struct type *type, const gdb_byte *from) |
e47577ab | 207 | { |
f5cf7aa1 | 208 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 209 | struct type *fpreg_type = register_type (current_gdbarch, M68K_FP0_REGNUM); |
e47577ab MK |
210 | |
211 | /* We only support floating-point values. */ | |
212 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
213 | { | |
8a3fe4f8 AC |
214 | warning (_("Cannot convert non-floating-point type " |
215 | "to floating-point register value.")); | |
e47577ab MK |
216 | return; |
217 | } | |
218 | ||
219 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent | |
220 | to the extended floating-point format used by the FPU. */ | |
8ed86d01 | 221 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
222 | put_frame_register (frame, regnum, to); |
223 | } | |
224 | ||
8de307e0 | 225 | \f |
f595cb19 MK |
226 | /* There is a fair number of calling conventions that are in somewhat |
227 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
228 | coprocessor. All function return values are stored in %d0/%d1. | |
229 | Structures are returned in a static buffer, a pointer to which is | |
230 | returned in %d0. This means that functions returning a structure | |
231 | are not re-entrant. To avoid this problem some systems use a | |
232 | convention where the caller passes a pointer to a buffer in %a1 | |
233 | where the return values is to be stored. This convention is the | |
234 | default, and is implemented in the function m68k_return_value. | |
235 | ||
236 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
237 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
238 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
239 | psABI. Integer values are returned in %d0/%d1, pointer return | |
240 | values in %a0 and floating values in %fp0. When calling functions | |
241 | returning a structure the caller should pass a pointer to a buffer | |
242 | for the return value in %a0. This convention is implemented in the | |
243 | function m68k_svr4_return_value, and by appropriately setting the | |
244 | struct_value_regnum member of `struct gdbarch_tdep'. | |
245 | ||
246 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
247 | for passing the structure return value buffer. | |
248 | ||
249 | GCC can also generate code where small structures are returned in | |
250 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
251 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
252 | embedded systems. This convention is implemented by setting the | |
253 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
254 | ||
255 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 256 | into VALBUF. */ |
942dc0e9 GS |
257 | |
258 | static void | |
8de307e0 | 259 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 260 | gdb_byte *valbuf) |
942dc0e9 | 261 | { |
8de307e0 | 262 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 263 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 264 | |
8de307e0 AS |
265 | if (len <= 4) |
266 | { | |
267 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
268 | memcpy (valbuf, buf + (4 - len), len); | |
269 | } | |
270 | else if (len <= 8) | |
271 | { | |
272 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
273 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 274 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
275 | } |
276 | else | |
277 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 278 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
279 | } |
280 | ||
942dc0e9 | 281 | static void |
f595cb19 | 282 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 283 | gdb_byte *valbuf) |
942dc0e9 | 284 | { |
8de307e0 | 285 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 286 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 287 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
942dc0e9 | 288 | |
8ed86d01 | 289 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 290 | { |
8ed86d01 VP |
291 | struct type *fpreg_type = register_type |
292 | (current_gdbarch, M68K_FP0_REGNUM); | |
f595cb19 | 293 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 294 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 295 | } |
f595cb19 MK |
296 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
297 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
298 | else | |
299 | m68k_extract_return_value (type, regcache, valbuf); | |
300 | } | |
301 | ||
302 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
303 | ||
304 | static void | |
305 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 306 | const gdb_byte *valbuf) |
f595cb19 MK |
307 | { |
308 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 309 | |
8de307e0 AS |
310 | if (len <= 4) |
311 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
312 | else if (len <= 8) | |
313 | { | |
f595cb19 | 314 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 315 | len - 4, valbuf); |
f5cf7aa1 | 316 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
317 | } |
318 | else | |
319 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 320 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 321 | } |
942dc0e9 | 322 | |
f595cb19 MK |
323 | static void |
324 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 325 | const gdb_byte *valbuf) |
942dc0e9 | 326 | { |
f595cb19 | 327 | int len = TYPE_LENGTH (type); |
8ed86d01 | 328 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
8de307e0 | 329 | |
8ed86d01 | 330 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 331 | { |
8ed86d01 VP |
332 | struct type *fpreg_type = register_type |
333 | (current_gdbarch, M68K_FP0_REGNUM); | |
f5cf7aa1 | 334 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 335 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
336 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
337 | } | |
338 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
339 | { | |
340 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
341 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
342 | } | |
343 | else | |
344 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
345 | } |
346 | ||
f595cb19 MK |
347 | /* Return non-zero if TYPE, which is assumed to be a structure or |
348 | union type, should be returned in registers for architecture | |
349 | GDBARCH. */ | |
350 | ||
c481dac7 | 351 | static int |
f595cb19 | 352 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 353 | { |
f595cb19 MK |
354 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
355 | enum type_code code = TYPE_CODE (type); | |
356 | int len = TYPE_LENGTH (type); | |
c481dac7 | 357 | |
f595cb19 MK |
358 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
359 | ||
360 | if (tdep->struct_return == pcc_struct_return) | |
361 | return 0; | |
362 | ||
363 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
364 | } |
365 | ||
f595cb19 MK |
366 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
367 | should be returned. If it is supposed to be returned in registers, | |
368 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
369 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
370 | from WRITEBUF into REGCACHE. */ | |
371 | ||
372 | static enum return_value_convention | |
373 | m68k_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
374 | struct regcache *regcache, gdb_byte *readbuf, |
375 | const gdb_byte *writebuf) | |
f595cb19 MK |
376 | { |
377 | enum type_code code = TYPE_CODE (type); | |
378 | ||
1c845060 MK |
379 | /* GCC returns a `long double' in memory too. */ |
380 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
381 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
382 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
383 | { | |
384 | /* The default on m68k is to return structures in static memory. | |
385 | Consequently a function must return the address where we can | |
386 | find the return value. */ | |
f595cb19 | 387 | |
1c845060 MK |
388 | if (readbuf) |
389 | { | |
390 | ULONGEST addr; | |
391 | ||
392 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
393 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
394 | } | |
395 | ||
396 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
397 | } | |
f595cb19 MK |
398 | |
399 | if (readbuf) | |
400 | m68k_extract_return_value (type, regcache, readbuf); | |
401 | if (writebuf) | |
402 | m68k_store_return_value (type, regcache, writebuf); | |
403 | ||
404 | return RETURN_VALUE_REGISTER_CONVENTION; | |
405 | } | |
406 | ||
407 | static enum return_value_convention | |
408 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
409 | struct regcache *regcache, gdb_byte *readbuf, |
410 | const gdb_byte *writebuf) | |
f595cb19 MK |
411 | { |
412 | enum type_code code = TYPE_CODE (type); | |
413 | ||
414 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
415 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
416 | { |
417 | /* The System V ABI says that: | |
418 | ||
419 | "A function returning a structure or union also sets %a0 to | |
420 | the value it finds in %a0. Thus when the caller receives | |
421 | control again, the address of the returned object resides in | |
422 | register %a0." | |
423 | ||
424 | So the ABI guarantees that we can always find the return | |
425 | value just after the function has returned. */ | |
426 | ||
427 | if (readbuf) | |
428 | { | |
429 | ULONGEST addr; | |
430 | ||
431 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
432 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
433 | } | |
434 | ||
435 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
436 | } | |
f595cb19 MK |
437 | |
438 | /* This special case is for structures consisting of a single | |
439 | `float' or `double' member. These structures are returned in | |
440 | %fp0. For these structures, we call ourselves recursively, | |
441 | changing TYPE into the type of the first member of the structure. | |
442 | Since that should work for all structures that have only one | |
443 | member, we don't bother to check the member's type here. */ | |
444 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
445 | { | |
446 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
447 | return m68k_svr4_return_value (gdbarch, type, regcache, | |
448 | readbuf, writebuf); | |
449 | } | |
450 | ||
451 | if (readbuf) | |
452 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
453 | if (writebuf) | |
454 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
455 | ||
456 | return RETURN_VALUE_REGISTER_CONVENTION; | |
457 | } | |
458 | \f | |
392a587b | 459 | |
9bb47d95 NS |
460 | /* Always align the frame to a 4-byte boundary. This is required on |
461 | coldfire and harmless on the rest. */ | |
462 | ||
463 | static CORE_ADDR | |
464 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
465 | { | |
466 | /* Align the stack to four bytes. */ | |
467 | return sp & ~3; | |
468 | } | |
469 | ||
8de307e0 | 470 | static CORE_ADDR |
7d9b040b | 471 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
472 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
473 | struct value **args, CORE_ADDR sp, int struct_return, | |
474 | CORE_ADDR struct_addr) | |
7f8e7424 | 475 | { |
f595cb19 | 476 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
f5cf7aa1 | 477 | gdb_byte buf[4]; |
8de307e0 AS |
478 | int i; |
479 | ||
480 | /* Push arguments in reverse order. */ | |
481 | for (i = nargs - 1; i >= 0; i--) | |
482 | { | |
4754a64e | 483 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 484 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 485 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
486 | int offset; |
487 | ||
488 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
489 | right aligned. */ | |
490 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
491 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
492 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
493 | && len > 4) | |
494 | offset = 0; | |
495 | else | |
496 | offset = container_len - len; | |
8de307e0 | 497 | sp -= container_len; |
46615f07 | 498 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
499 | } |
500 | ||
c481dac7 | 501 | /* Store struct value address. */ |
8de307e0 AS |
502 | if (struct_return) |
503 | { | |
8de307e0 | 504 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 505 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
506 | } |
507 | ||
508 | /* Store return address. */ | |
509 | sp -= 4; | |
510 | store_unsigned_integer (buf, 4, bp_addr); | |
511 | write_memory (sp, buf, 4); | |
512 | ||
513 | /* Finally, update the stack pointer... */ | |
514 | store_unsigned_integer (buf, 4, sp); | |
515 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
516 | ||
517 | /* ...and fake a frame pointer. */ | |
518 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
519 | ||
520 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
521 | frame's CFA. */ | |
522 | return sp + 8; | |
7f8e7424 | 523 | } |
6dd0fba6 NS |
524 | |
525 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
526 | ||
527 | static int | |
528 | m68k_dwarf_reg_to_regnum (int num) | |
529 | { | |
530 | if (num < 8) | |
531 | /* d0..7 */ | |
532 | return (num - 0) + M68K_D0_REGNUM; | |
533 | else if (num < 16) | |
534 | /* a0..7 */ | |
535 | return (num - 8) + M68K_A0_REGNUM; | |
8ed86d01 | 536 | else if (num < 24 && gdbarch_tdep (current_gdbarch)->fpregs_present) |
6dd0fba6 NS |
537 | /* fp0..7 */ |
538 | return (num - 16) + M68K_FP0_REGNUM; | |
539 | else if (num == 25) | |
540 | /* pc */ | |
541 | return M68K_PC_REGNUM; | |
542 | else | |
f57d151a UW |
543 | return gdbarch_num_regs (current_gdbarch) |
544 | + gdbarch_num_pseudo_regs (current_gdbarch); | |
6dd0fba6 NS |
545 | } |
546 | ||
8de307e0 AS |
547 | \f |
548 | struct m68k_frame_cache | |
549 | { | |
550 | /* Base address. */ | |
551 | CORE_ADDR base; | |
552 | CORE_ADDR sp_offset; | |
553 | CORE_ADDR pc; | |
7f8e7424 | 554 | |
8de307e0 AS |
555 | /* Saved registers. */ |
556 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
557 | CORE_ADDR saved_sp; | |
7f8e7424 | 558 | |
8de307e0 AS |
559 | /* Stack space reserved for local variables. */ |
560 | long locals; | |
561 | }; | |
c906108c | 562 | |
8de307e0 AS |
563 | /* Allocate and initialize a frame cache. */ |
564 | ||
565 | static struct m68k_frame_cache * | |
566 | m68k_alloc_frame_cache (void) | |
c906108c | 567 | { |
8de307e0 AS |
568 | struct m68k_frame_cache *cache; |
569 | int i; | |
c906108c | 570 | |
8de307e0 | 571 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 572 | |
8de307e0 AS |
573 | /* Base address. */ |
574 | cache->base = 0; | |
575 | cache->sp_offset = -4; | |
576 | cache->pc = 0; | |
c906108c | 577 | |
8de307e0 AS |
578 | /* Saved registers. We initialize these to -1 since zero is a valid |
579 | offset (that's where %fp is supposed to be stored). */ | |
580 | for (i = 0; i < M68K_NUM_REGS; i++) | |
581 | cache->saved_regs[i] = -1; | |
582 | ||
583 | /* Frameless until proven otherwise. */ | |
584 | cache->locals = -1; | |
585 | ||
586 | return cache; | |
c906108c SS |
587 | } |
588 | ||
8de307e0 AS |
589 | /* Check whether PC points at a code that sets up a new stack frame. |
590 | If so, it updates CACHE and returns the address of the first | |
591 | instruction after the sequence that sets removes the "hidden" | |
592 | argument from the stack or CURRENT_PC, whichever is smaller. | |
593 | Otherwise, return PC. */ | |
c906108c | 594 | |
8de307e0 AS |
595 | static CORE_ADDR |
596 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
597 | struct m68k_frame_cache *cache) | |
c906108c | 598 | { |
8de307e0 AS |
599 | int op; |
600 | ||
601 | if (pc >= current_pc) | |
602 | return current_pc; | |
c906108c | 603 | |
8de307e0 AS |
604 | op = read_memory_unsigned_integer (pc, 2); |
605 | ||
606 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 607 | { |
8de307e0 AS |
608 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
609 | cache->sp_offset += 4; | |
610 | if (op == P_LINKW_FP) | |
611 | { | |
612 | /* link.w %fp, #-N */ | |
613 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
614 | cache->locals = -read_memory_integer (pc + 2, 2); | |
615 | ||
616 | if (pc + 4 < current_pc && cache->locals == 0) | |
617 | { | |
618 | op = read_memory_unsigned_integer (pc + 4, 2); | |
619 | if (op == P_ADDAL_SP) | |
620 | { | |
621 | cache->locals = read_memory_integer (pc + 6, 4); | |
622 | return pc + 10; | |
623 | } | |
624 | } | |
625 | ||
626 | return pc + 4; | |
627 | } | |
628 | else if (op == P_LINKL_FP) | |
c906108c | 629 | { |
8de307e0 AS |
630 | /* link.l %fp, #-N */ |
631 | cache->locals = -read_memory_integer (pc + 2, 4); | |
632 | return pc + 6; | |
633 | } | |
634 | else | |
635 | { | |
636 | /* pea (%fp); movea.l %sp, %fp */ | |
637 | cache->locals = 0; | |
638 | ||
639 | if (pc + 2 < current_pc) | |
640 | { | |
641 | op = read_memory_unsigned_integer (pc + 2, 2); | |
642 | ||
643 | if (op == P_MOVEAL_SP_FP) | |
644 | { | |
645 | /* move.l %sp, %fp */ | |
646 | return pc + 4; | |
647 | } | |
648 | } | |
649 | ||
650 | return pc + 2; | |
c906108c SS |
651 | } |
652 | } | |
8de307e0 | 653 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 654 | { |
8de307e0 AS |
655 | /* subq.[wl] #N,%sp */ |
656 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
657 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
658 | if (pc + 2 < current_pc) | |
c906108c | 659 | { |
8de307e0 AS |
660 | op = read_memory_unsigned_integer (pc + 2, 2); |
661 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
662 | { | |
663 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
664 | return pc + 4; | |
665 | } | |
c906108c | 666 | } |
8de307e0 AS |
667 | return pc + 2; |
668 | } | |
669 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
670 | { | |
671 | /* adda.w #-N,%sp */ | |
672 | /* lea (-N,%sp),%sp */ | |
673 | cache->locals = -read_memory_integer (pc + 2, 2); | |
674 | return pc + 4; | |
c906108c | 675 | } |
8de307e0 | 676 | else if (op == P_ADDAL_SP) |
c906108c | 677 | { |
8de307e0 AS |
678 | /* adda.l #-N,%sp */ |
679 | cache->locals = -read_memory_integer (pc + 2, 4); | |
680 | return pc + 6; | |
c906108c | 681 | } |
8de307e0 AS |
682 | |
683 | return pc; | |
c906108c | 684 | } |
c5aa993b | 685 | |
8de307e0 AS |
686 | /* Check whether PC points at code that saves registers on the stack. |
687 | If so, it updates CACHE and returns the address of the first | |
688 | instruction after the register saves or CURRENT_PC, whichever is | |
689 | smaller. Otherwise, return PC. */ | |
c906108c | 690 | |
8de307e0 AS |
691 | static CORE_ADDR |
692 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
693 | struct m68k_frame_cache *cache) | |
694 | { | |
695 | if (cache->locals >= 0) | |
696 | { | |
697 | CORE_ADDR offset; | |
698 | int op; | |
699 | int i, mask, regno; | |
c906108c | 700 | |
8de307e0 AS |
701 | offset = -4 - cache->locals; |
702 | while (pc < current_pc) | |
703 | { | |
704 | op = read_memory_unsigned_integer (pc, 2); | |
8ed86d01 VP |
705 | if (op == P_FMOVEMX_SP |
706 | && gdbarch_tdep (current_gdbarch)->fpregs_present) | |
8de307e0 AS |
707 | { |
708 | /* fmovem.x REGS,-(%sp) */ | |
709 | op = read_memory_unsigned_integer (pc + 2, 2); | |
710 | if ((op & 0xff00) == 0xe000) | |
711 | { | |
712 | mask = op & 0xff; | |
713 | for (i = 0; i < 16; i++, mask >>= 1) | |
714 | { | |
715 | if (mask & 1) | |
716 | { | |
717 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
718 | offset -= 12; | |
719 | } | |
720 | } | |
721 | pc += 4; | |
722 | } | |
723 | else | |
724 | break; | |
725 | } | |
0ba5a932 | 726 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
727 | { |
728 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 729 | regno = op & 017; |
8de307e0 AS |
730 | cache->saved_regs[regno] = offset; |
731 | offset -= 4; | |
732 | pc += 2; | |
733 | } | |
734 | else if (op == P_MOVEML_SP) | |
735 | { | |
736 | /* movem.l REGS,-(%sp) */ | |
737 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
738 | for (i = 0; i < 16; i++, mask >>= 1) | |
739 | { | |
740 | if (mask & 1) | |
741 | { | |
742 | cache->saved_regs[15 - i] = offset; | |
743 | offset -= 4; | |
744 | } | |
745 | } | |
746 | pc += 4; | |
747 | } | |
748 | else | |
749 | break; | |
750 | } | |
751 | } | |
752 | ||
753 | return pc; | |
754 | } | |
c906108c | 755 | |
c906108c | 756 | |
8de307e0 AS |
757 | /* Do a full analysis of the prologue at PC and update CACHE |
758 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
759 | address where the analysis stopped. | |
c906108c | 760 | |
8de307e0 | 761 | We handle all cases that can be generated by gcc. |
c906108c | 762 | |
8de307e0 | 763 | For allocating a stack frame: |
c906108c | 764 | |
8de307e0 AS |
765 | link.w %a6,#-N |
766 | link.l %a6,#-N | |
767 | pea (%fp); move.l %sp,%fp | |
768 | link.w %a6,#0; add.l #-N,%sp | |
769 | subq.l #N,%sp | |
770 | subq.w #N,%sp | |
771 | subq.w #8,%sp; subq.w #N-8,%sp | |
772 | add.w #-N,%sp | |
773 | lea (-N,%sp),%sp | |
774 | add.l #-N,%sp | |
c906108c | 775 | |
8de307e0 | 776 | For saving registers: |
c906108c | 777 | |
8de307e0 AS |
778 | fmovem.x REGS,-(%sp) |
779 | move.l R1,-(%sp) | |
780 | move.l R1,-(%sp); move.l R2,-(%sp) | |
781 | movem.l REGS,-(%sp) | |
c906108c | 782 | |
8de307e0 | 783 | For setting up the PIC register: |
c906108c | 784 | |
8de307e0 | 785 | lea (%pc,N),%a5 |
c906108c | 786 | |
8de307e0 | 787 | */ |
c906108c | 788 | |
eb2e12d7 | 789 | static CORE_ADDR |
8de307e0 AS |
790 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
791 | struct m68k_frame_cache *cache) | |
c906108c | 792 | { |
8de307e0 | 793 | unsigned int op; |
c906108c | 794 | |
8de307e0 AS |
795 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
796 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
797 | if (pc >= current_pc) | |
798 | return current_pc; | |
c906108c | 799 | |
8de307e0 AS |
800 | /* Check for GOT setup. */ |
801 | op = read_memory_unsigned_integer (pc, 4); | |
802 | if (op == P_LEA_PC_A5) | |
c906108c | 803 | { |
8de307e0 AS |
804 | /* lea (%pc,N),%a5 */ |
805 | return pc + 6; | |
c906108c | 806 | } |
8de307e0 AS |
807 | |
808 | return pc; | |
c906108c SS |
809 | } |
810 | ||
8de307e0 | 811 | /* Return PC of first real instruction. */ |
7f8e7424 | 812 | |
8de307e0 AS |
813 | static CORE_ADDR |
814 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 815 | { |
8de307e0 AS |
816 | struct m68k_frame_cache cache; |
817 | CORE_ADDR pc; | |
818 | int op; | |
c906108c | 819 | |
8de307e0 AS |
820 | cache.locals = -1; |
821 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
822 | if (cache.locals < 0) | |
823 | return start_pc; | |
824 | return pc; | |
825 | } | |
c906108c | 826 | |
8de307e0 AS |
827 | static CORE_ADDR |
828 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
829 | { | |
f5cf7aa1 | 830 | gdb_byte buf[8]; |
7f8e7424 | 831 | |
3e8c568d | 832 | frame_unwind_register (next_frame, gdbarch_pc_regnum (current_gdbarch), buf); |
8de307e0 AS |
833 | return extract_typed_address (buf, builtin_type_void_func_ptr); |
834 | } | |
835 | \f | |
836 | /* Normal frames. */ | |
7f8e7424 | 837 | |
8de307e0 AS |
838 | static struct m68k_frame_cache * |
839 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
840 | { | |
841 | struct m68k_frame_cache *cache; | |
f5cf7aa1 | 842 | gdb_byte buf[4]; |
8de307e0 AS |
843 | int i; |
844 | ||
845 | if (*this_cache) | |
846 | return *this_cache; | |
847 | ||
848 | cache = m68k_alloc_frame_cache (); | |
849 | *this_cache = cache; | |
850 | ||
851 | /* In principle, for normal frames, %fp holds the frame pointer, | |
852 | which holds the base address for the current stack frame. | |
853 | However, for functions that don't need it, the frame pointer is | |
854 | optional. For these "frameless" functions the frame pointer is | |
855 | actually the frame pointer of the calling frame. Signal | |
856 | trampolines are just a special case of a "frameless" function. | |
857 | They (usually) share their frame pointer with the frame that was | |
858 | in progress when the signal occurred. */ | |
859 | ||
860 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
861 | cache->base = extract_unsigned_integer (buf, 4); | |
862 | if (cache->base == 0) | |
863 | return cache; | |
864 | ||
865 | /* For normal frames, %pc is stored at 4(%fp). */ | |
866 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
867 | ||
93d42b30 | 868 | cache->pc = frame_func_unwind (next_frame, NORMAL_FRAME); |
8de307e0 AS |
869 | if (cache->pc != 0) |
870 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
871 | ||
872 | if (cache->locals < 0) | |
873 | { | |
874 | /* We didn't find a valid frame, which means that CACHE->base | |
875 | currently holds the frame pointer for our calling frame. If | |
876 | we're at the start of a function, or somewhere half-way its | |
877 | prologue, the function's frame probably hasn't been fully | |
878 | setup yet. Try to reconstruct the base address for the stack | |
879 | frame by looking at the stack pointer. For truly "frameless" | |
880 | functions this might work too. */ | |
881 | ||
882 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
883 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
884 | } | |
7f8e7424 | 885 | |
8de307e0 AS |
886 | /* Now that we have the base address for the stack frame we can |
887 | calculate the value of %sp in the calling frame. */ | |
888 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 889 | |
8de307e0 AS |
890 | /* Adjust all the saved registers such that they contain addresses |
891 | instead of offsets. */ | |
892 | for (i = 0; i < M68K_NUM_REGS; i++) | |
893 | if (cache->saved_regs[i] != -1) | |
894 | cache->saved_regs[i] += cache->base; | |
c906108c | 895 | |
8de307e0 AS |
896 | return cache; |
897 | } | |
c906108c | 898 | |
8de307e0 AS |
899 | static void |
900 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
901 | struct frame_id *this_id) | |
902 | { | |
903 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 904 | |
8de307e0 AS |
905 | /* This marks the outermost frame. */ |
906 | if (cache->base == 0) | |
907 | return; | |
c5aa993b | 908 | |
8de307e0 AS |
909 | /* See the end of m68k_push_dummy_call. */ |
910 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
911 | } | |
c5aa993b | 912 | |
8de307e0 AS |
913 | static void |
914 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
915 | int regnum, int *optimizedp, | |
916 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
60b04da5 | 917 | int *realnump, gdb_byte *valuep) |
8de307e0 AS |
918 | { |
919 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
920 | ||
921 | gdb_assert (regnum >= 0); | |
922 | ||
923 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 924 | { |
8de307e0 AS |
925 | *optimizedp = 0; |
926 | *lvalp = not_lval; | |
927 | *addrp = 0; | |
928 | *realnump = -1; | |
929 | if (valuep) | |
c906108c | 930 | { |
8de307e0 AS |
931 | /* Store the value. */ |
932 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 933 | } |
8de307e0 AS |
934 | return; |
935 | } | |
936 | ||
937 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
938 | { | |
939 | *optimizedp = 0; | |
940 | *lvalp = lval_memory; | |
941 | *addrp = cache->saved_regs[regnum]; | |
942 | *realnump = -1; | |
943 | if (valuep) | |
89c3b6d3 | 944 | { |
8de307e0 AS |
945 | /* Read the value in from memory. */ |
946 | read_memory (*addrp, valuep, | |
947 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 948 | } |
8de307e0 | 949 | return; |
c906108c | 950 | } |
8de307e0 | 951 | |
00b25ff3 AC |
952 | *optimizedp = 0; |
953 | *lvalp = lval_register; | |
954 | *addrp = 0; | |
955 | *realnump = regnum; | |
956 | if (valuep) | |
957 | frame_unwind_register (next_frame, (*realnump), valuep); | |
8de307e0 AS |
958 | } |
959 | ||
960 | static const struct frame_unwind m68k_frame_unwind = | |
961 | { | |
962 | NORMAL_FRAME, | |
963 | m68k_frame_this_id, | |
964 | m68k_frame_prev_register | |
965 | }; | |
966 | ||
967 | static const struct frame_unwind * | |
336d1bba | 968 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
969 | { |
970 | return &m68k_frame_unwind; | |
971 | } | |
972 | \f | |
8de307e0 AS |
973 | static CORE_ADDR |
974 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
975 | { | |
976 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
977 | ||
978 | return cache->base; | |
979 | } | |
980 | ||
981 | static const struct frame_base m68k_frame_base = | |
982 | { | |
983 | &m68k_frame_unwind, | |
984 | m68k_frame_base_address, | |
985 | m68k_frame_base_address, | |
986 | m68k_frame_base_address | |
987 | }; | |
988 | ||
989 | static struct frame_id | |
990 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
991 | { | |
f5cf7aa1 | 992 | gdb_byte buf[4]; |
8de307e0 | 993 | CORE_ADDR fp; |
c906108c | 994 | |
8de307e0 AS |
995 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
996 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 997 | |
8de307e0 AS |
998 | /* See the end of m68k_push_dummy_call. */ |
999 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
1000 | } | |
1001 | \f | |
c906108c | 1002 | |
c906108c SS |
1003 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1004 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1005 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
1006 | This routine returns true on success. */ | |
1007 | ||
c34d127c | 1008 | static int |
60ade65d | 1009 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 1010 | { |
f5cf7aa1 | 1011 | gdb_byte *buf; |
c906108c | 1012 | CORE_ADDR sp, jb_addr; |
60ade65d | 1013 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
eb2e12d7 AS |
1014 | |
1015 | if (tdep->jb_pc < 0) | |
1016 | { | |
1017 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1018 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1019 | return 0; |
1020 | } | |
c906108c | 1021 | |
819844ad | 1022 | buf = alloca (gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT); |
3e8c568d | 1023 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (current_gdbarch)); |
c906108c | 1024 | |
b5d78d39 | 1025 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
819844ad UW |
1026 | buf, |
1027 | gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT)) | |
c906108c SS |
1028 | return 0; |
1029 | ||
819844ad UW |
1030 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (current_gdbarch) |
1031 | / TARGET_CHAR_BIT); | |
c906108c | 1032 | |
eb2e12d7 | 1033 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
819844ad | 1034 | gdbarch_ptr_bit (current_gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1035 | return 0; |
1036 | ||
819844ad UW |
1037 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (current_gdbarch) |
1038 | / TARGET_CHAR_BIT); | |
c906108c SS |
1039 | return 1; |
1040 | } | |
f595cb19 MK |
1041 | \f |
1042 | ||
1043 | /* System V Release 4 (SVR4). */ | |
1044 | ||
1045 | void | |
1046 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1047 | { | |
1048 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1049 | ||
1050 | /* SVR4 uses a different calling convention. */ | |
1051 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1052 | ||
1053 | /* SVR4 uses %a0 instead of %a1. */ | |
1054 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1055 | } | |
1056 | \f | |
c906108c | 1057 | |
152d9db6 GS |
1058 | /* Function: m68k_gdbarch_init |
1059 | Initializer function for the m68k gdbarch vector. | |
1060 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1061 | ||
1062 | static struct gdbarch * | |
1063 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1064 | { | |
1065 | struct gdbarch_tdep *tdep = NULL; | |
1066 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1067 | struct gdbarch_list *best_arch; |
1068 | struct tdesc_arch_data *tdesc_data = NULL; | |
1069 | int i; | |
1070 | enum m68k_flavour flavour = m68k_no_flavour; | |
1071 | int has_fp = 1; | |
1072 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1073 | ||
1074 | /* Check any target description for validity. */ | |
1075 | if (tdesc_has_registers (info.target_desc)) | |
1076 | { | |
1077 | const struct tdesc_feature *feature; | |
1078 | int valid_p; | |
152d9db6 | 1079 | |
8ed86d01 VP |
1080 | feature = tdesc_find_feature (info.target_desc, |
1081 | "org.gnu.gdb.m68k.core"); | |
1082 | if (feature != NULL) | |
1083 | /* Do nothing. */ | |
1084 | ; | |
1085 | ||
1086 | if (feature == NULL) | |
1087 | { | |
1088 | feature = tdesc_find_feature (info.target_desc, | |
1089 | "org.gnu.gdb.coldfire.core"); | |
1090 | if (feature != NULL) | |
1091 | flavour = m68k_coldfire_flavour; | |
1092 | } | |
1093 | ||
1094 | if (feature == NULL) | |
1095 | { | |
1096 | feature = tdesc_find_feature (info.target_desc, | |
1097 | "org.gnu.gdb.fido.core"); | |
1098 | if (feature != NULL) | |
1099 | flavour = m68k_fido_flavour; | |
1100 | } | |
1101 | ||
1102 | if (feature == NULL) | |
1103 | return NULL; | |
1104 | ||
1105 | tdesc_data = tdesc_data_alloc (); | |
1106 | ||
1107 | valid_p = 1; | |
1108 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1109 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1110 | m68k_register_names[i]); | |
1111 | ||
1112 | if (!valid_p) | |
1113 | { | |
1114 | tdesc_data_cleanup (tdesc_data); | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | feature = tdesc_find_feature (info.target_desc, | |
1119 | "org.gnu.gdb.coldfire.fp"); | |
1120 | if (feature != NULL) | |
1121 | { | |
1122 | valid_p = 1; | |
1123 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1124 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1125 | m68k_register_names[i]); | |
1126 | if (!valid_p) | |
1127 | { | |
1128 | tdesc_data_cleanup (tdesc_data); | |
1129 | return NULL; | |
1130 | } | |
1131 | } | |
1132 | else | |
1133 | has_fp = 0; | |
1134 | } | |
1135 | ||
1136 | /* The mechanism for returning floating values from function | |
1137 | and the type of long double depend on whether we're | |
1138 | on ColdFire or standard m68k. */ | |
1139 | ||
4ed77933 | 1140 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1141 | { |
1142 | const bfd_arch_info_type *coldfire_arch = | |
1143 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1144 | ||
1145 | if (coldfire_arch | |
4ed77933 AS |
1146 | && ((*info.bfd_arch_info->compatible) |
1147 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1148 | flavour = m68k_coldfire_flavour; |
1149 | } | |
1150 | ||
1151 | /* If there is already a candidate, use it. */ | |
1152 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1153 | best_arch != NULL; | |
1154 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1155 | { | |
1156 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1157 | continue; | |
1158 | ||
1159 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1160 | continue; | |
1161 | ||
1162 | break; | |
1163 | } | |
152d9db6 | 1164 | |
eb2e12d7 AS |
1165 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1166 | gdbarch = gdbarch_alloc (&info, tdep); | |
8ed86d01 VP |
1167 | tdep->fpregs_present = has_fp; |
1168 | tdep->flavour = flavour; | |
152d9db6 | 1169 | |
8ed86d01 VP |
1170 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1171 | long_double_format = floatformats_ieee_double; | |
1172 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1173 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1174 | |
5d3ed2e3 | 1175 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1176 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1177 | |
1178 | /* Stack grows down. */ | |
1179 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
9bb47d95 | 1180 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1181 | |
1182 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1183 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1184 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1185 | |
6300c360 | 1186 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 NS |
1187 | set_gdbarch_dwarf_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
1188 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); | |
942dc0e9 | 1189 | |
8de307e0 | 1190 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1191 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1192 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1193 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1194 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1195 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1196 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
e47577ab MK |
1197 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1198 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1199 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1200 | |
8ed86d01 VP |
1201 | if (has_fp) |
1202 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1203 | ||
1204 | /* Try to figure out if the arch uses floating registers to return | |
1205 | floating point values from functions. */ | |
1206 | if (has_fp) | |
1207 | { | |
1208 | /* On ColdFire, floating point values are returned in D0. */ | |
1209 | if (flavour == m68k_coldfire_flavour) | |
1210 | tdep->float_return = 0; | |
1211 | else | |
1212 | tdep->float_return = 1; | |
1213 | } | |
1214 | else | |
1215 | { | |
1216 | /* No floating registers, so can't use them for returning values. */ | |
1217 | tdep->float_return = 0; | |
1218 | } | |
1219 | ||
1220 | /* Function call & return */ | |
8de307e0 | 1221 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1222 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1223 | |
8ed86d01 | 1224 | |
650fcc91 AS |
1225 | /* Disassembler. */ |
1226 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1227 | ||
eb2e12d7 AS |
1228 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1229 | tdep->jb_pc = JB_PC; | |
1230 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1231 | #else | |
1232 | tdep->jb_pc = -1; | |
1233 | #endif | |
f595cb19 | 1234 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1235 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1236 | |
1237 | /* Frame unwinder. */ | |
1238 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1239 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1240 | |
1241 | /* Hook in the DWARF CFI frame unwinder. */ | |
1242 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1243 | ||
8de307e0 | 1244 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1245 | |
55809acb AS |
1246 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1247 | gdbarch_init_osabi (info, gdbarch); | |
1248 | ||
eb2e12d7 AS |
1249 | /* Now we have tuned the configuration, set a few final things, |
1250 | based on what the OS ABI has told us. */ | |
1251 | ||
1252 | if (tdep->jb_pc >= 0) | |
1253 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1254 | ||
336d1bba | 1255 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1256 | |
8ed86d01 VP |
1257 | if (tdesc_data) |
1258 | tdesc_use_registers (gdbarch, tdesc_data); | |
1259 | ||
152d9db6 GS |
1260 | return gdbarch; |
1261 | } | |
1262 | ||
1263 | ||
1264 | static void | |
1265 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1266 | { | |
eb2e12d7 | 1267 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1268 | |
eb2e12d7 AS |
1269 | if (tdep == NULL) |
1270 | return; | |
152d9db6 | 1271 | } |
2acceee2 | 1272 | |
a78f21af AC |
1273 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1274 | ||
c906108c | 1275 | void |
fba45db2 | 1276 | _initialize_m68k_tdep (void) |
c906108c | 1277 | { |
152d9db6 | 1278 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
4713453b AS |
1279 | |
1280 | /* Initialize the m68k-specific register types. */ | |
1281 | m68k_init_types (); | |
c906108c | 1282 | } |