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, |
0fb0cc75 JB |
4 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
5 | Free Software Foundation, Inc. | |
c906108c | 6 | |
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | #include "defs.h" | |
3f244638 | 23 | #include "dwarf2-frame.h" |
c906108c | 24 | #include "frame.h" |
8de307e0 AS |
25 | #include "frame-base.h" |
26 | #include "frame-unwind.h" | |
e6bb342a | 27 | #include "gdbtypes.h" |
c906108c SS |
28 | #include "symtab.h" |
29 | #include "gdbcore.h" | |
30 | #include "value.h" | |
31 | #include "gdb_string.h" | |
8de307e0 | 32 | #include "gdb_assert.h" |
7a292a7a | 33 | #include "inferior.h" |
4e052eda | 34 | #include "regcache.h" |
5d3ed2e3 | 35 | #include "arch-utils.h" |
55809acb | 36 | #include "osabi.h" |
a89aa300 | 37 | #include "dis-asm.h" |
8ed86d01 | 38 | #include "target-descriptions.h" |
32eeb91a AS |
39 | |
40 | #include "m68k-tdep.h" | |
c906108c | 41 | \f |
c5aa993b | 42 | |
89c3b6d3 PDM |
43 | #define P_LINKL_FP 0x480e |
44 | #define P_LINKW_FP 0x4e56 | |
45 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
46 | #define P_MOVEAL_SP_FP 0x2c4f |
47 | #define P_ADDAW_SP 0xdefc | |
48 | #define P_ADDAL_SP 0xdffc | |
49 | #define P_SUBQW_SP 0x514f | |
50 | #define P_SUBQL_SP 0x518f | |
51 | #define P_LEA_SP_SP 0x4fef | |
52 | #define P_LEA_PC_A5 0x4bfb0170 | |
53 | #define P_FMOVEMX_SP 0xf227 | |
54 | #define P_MOVEL_SP 0x2f00 | |
55 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 56 | |
103a1597 | 57 | /* Offset from SP to first arg on stack at first instruction of a function */ |
103a1597 GS |
58 | #define SP_ARG0 (1 * 4) |
59 | ||
103a1597 GS |
60 | #if !defined (BPT_VECTOR) |
61 | #define BPT_VECTOR 0xf | |
62 | #endif | |
63 | ||
f5cf7aa1 | 64 | static const gdb_byte * |
67d57894 MD |
65 | m68k_local_breakpoint_from_pc (struct gdbarch *gdbarch, |
66 | CORE_ADDR *pcptr, int *lenptr) | |
103a1597 | 67 | { |
f5cf7aa1 | 68 | static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
103a1597 GS |
69 | *lenptr = sizeof (break_insn); |
70 | return break_insn; | |
71 | } | |
4713453b AS |
72 | \f |
73 | ||
4713453b | 74 | /* Construct types for ISA-specific registers. */ |
209bd28e UW |
75 | static struct type * |
76 | m68k_ps_type (struct gdbarch *gdbarch) | |
4713453b | 77 | { |
209bd28e UW |
78 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
79 | ||
80 | if (!tdep->m68k_ps_type) | |
81 | { | |
82 | struct type *type; | |
83 | ||
e9bb382b | 84 | type = arch_flags_type (gdbarch, "builtin_type_m68k_ps", 4); |
209bd28e UW |
85 | append_flags_type_flag (type, 0, "C"); |
86 | append_flags_type_flag (type, 1, "V"); | |
87 | append_flags_type_flag (type, 2, "Z"); | |
88 | append_flags_type_flag (type, 3, "N"); | |
89 | append_flags_type_flag (type, 4, "X"); | |
90 | append_flags_type_flag (type, 8, "I0"); | |
91 | append_flags_type_flag (type, 9, "I1"); | |
92 | append_flags_type_flag (type, 10, "I2"); | |
93 | append_flags_type_flag (type, 12, "M"); | |
94 | append_flags_type_flag (type, 13, "S"); | |
95 | append_flags_type_flag (type, 14, "T0"); | |
96 | append_flags_type_flag (type, 15, "T1"); | |
97 | ||
98 | tdep->m68k_ps_type = type; | |
99 | } | |
100 | ||
101 | return tdep->m68k_ps_type; | |
4713453b | 102 | } |
103a1597 | 103 | |
27067745 UW |
104 | static struct type * |
105 | m68881_ext_type (struct gdbarch *gdbarch) | |
106 | { | |
107 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
108 | ||
109 | if (!tdep->m68881_ext_type) | |
110 | tdep->m68881_ext_type | |
e9bb382b | 111 | = arch_float_type (gdbarch, -1, "builtin_type_m68881_ext", |
27067745 UW |
112 | floatformats_m68881_ext); |
113 | ||
114 | return tdep->m68881_ext_type; | |
115 | } | |
116 | ||
d85fe7f7 AS |
117 | /* Return the GDB type object for the "standard" data type of data in |
118 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
119 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
120 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
121 | addresses return pointer to void, not pointer to char, because we | |
122 | don't want to attempt to print the string after printing the | |
123 | address. */ | |
5d3ed2e3 GS |
124 | |
125 | static struct type * | |
8de307e0 | 126 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 127 | { |
c984b7ff | 128 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
03dac896 | 129 | |
8ed86d01 VP |
130 | if (tdep->fpregs_present) |
131 | { | |
c984b7ff UW |
132 | if (regnum >= gdbarch_fp0_regnum (gdbarch) |
133 | && regnum <= gdbarch_fp0_regnum (gdbarch) + 7) | |
8ed86d01 VP |
134 | { |
135 | if (tdep->flavour == m68k_coldfire_flavour) | |
136 | return builtin_type (gdbarch)->builtin_double; | |
137 | else | |
27067745 | 138 | return m68881_ext_type (gdbarch); |
8ed86d01 VP |
139 | } |
140 | ||
141 | if (regnum == M68K_FPI_REGNUM) | |
0dfff4cb | 142 | return builtin_type (gdbarch)->builtin_func_ptr; |
8ed86d01 VP |
143 | |
144 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) | |
df4df182 | 145 | return builtin_type (gdbarch)->builtin_int32; |
8ed86d01 VP |
146 | } |
147 | else | |
148 | { | |
149 | if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) | |
df4df182 | 150 | return builtin_type (gdbarch)->builtin_int0; |
8ed86d01 | 151 | } |
03dac896 | 152 | |
c984b7ff | 153 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
0dfff4cb | 154 | return builtin_type (gdbarch)->builtin_func_ptr; |
03dac896 | 155 | |
32eeb91a | 156 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
0dfff4cb | 157 | return builtin_type (gdbarch)->builtin_data_ptr; |
03dac896 | 158 | |
4713453b | 159 | if (regnum == M68K_PS_REGNUM) |
209bd28e | 160 | return m68k_ps_type (gdbarch); |
4713453b | 161 | |
df4df182 | 162 | return builtin_type (gdbarch)->builtin_int32; |
5d3ed2e3 GS |
163 | } |
164 | ||
8ed86d01 | 165 | static const char *m68k_register_names[] = { |
5d3ed2e3 GS |
166 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
167 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
168 | "ps", "pc", | |
169 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
8ed86d01 | 170 | "fpcontrol", "fpstatus", "fpiaddr" |
5d3ed2e3 GS |
171 | }; |
172 | ||
8ed86d01 VP |
173 | /* Function: m68k_register_name |
174 | Returns the name of the standard m68k register regnum. */ | |
175 | ||
176 | static const char * | |
d93859e2 | 177 | m68k_register_name (struct gdbarch *gdbarch, int regnum) |
8ed86d01 VP |
178 | { |
179 | if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names)) | |
5d3ed2e3 | 180 | internal_error (__FILE__, __LINE__, |
e2e0b3e5 | 181 | _("m68k_register_name: illegal register number %d"), regnum); |
5d3ed2e3 | 182 | else |
8ed86d01 | 183 | return m68k_register_names[regnum]; |
5d3ed2e3 | 184 | } |
e47577ab MK |
185 | \f |
186 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
187 | needs any special handling. */ | |
188 | ||
189 | static int | |
0abe36f5 | 190 | m68k_convert_register_p (struct gdbarch *gdbarch, int regnum, struct type *type) |
e47577ab | 191 | { |
0abe36f5 | 192 | if (!gdbarch_tdep (gdbarch)->fpregs_present) |
8ed86d01 | 193 | return 0; |
83acabca | 194 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7 |
27067745 | 195 | && type != m68881_ext_type (gdbarch)); |
e47577ab MK |
196 | } |
197 | ||
198 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
199 | return its contents in TO. */ | |
200 | ||
201 | static void | |
202 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 203 | struct type *type, gdb_byte *to) |
e47577ab | 204 | { |
f5cf7aa1 | 205 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
206 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
207 | M68K_FP0_REGNUM); | |
e47577ab MK |
208 | |
209 | /* We only support floating-point values. */ | |
210 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
211 | { | |
8a3fe4f8 AC |
212 | warning (_("Cannot convert floating-point register value " |
213 | "to non-floating-point type.")); | |
e47577ab MK |
214 | return; |
215 | } | |
216 | ||
83acabca | 217 | /* Convert to TYPE. */ |
e47577ab | 218 | get_frame_register (frame, regnum, from); |
8ed86d01 | 219 | convert_typed_floating (from, fpreg_type, to, type); |
e47577ab MK |
220 | } |
221 | ||
222 | /* Write the contents FROM of a value of type TYPE into register | |
223 | REGNUM in frame FRAME. */ | |
224 | ||
225 | static void | |
226 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 227 | struct type *type, const gdb_byte *from) |
e47577ab | 228 | { |
f5cf7aa1 | 229 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
230 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
231 | M68K_FP0_REGNUM); | |
e47577ab MK |
232 | |
233 | /* We only support floating-point values. */ | |
234 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
235 | { | |
8a3fe4f8 AC |
236 | warning (_("Cannot convert non-floating-point type " |
237 | "to floating-point register value.")); | |
e47577ab MK |
238 | return; |
239 | } | |
240 | ||
83acabca | 241 | /* Convert from TYPE. */ |
8ed86d01 | 242 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
243 | put_frame_register (frame, regnum, to); |
244 | } | |
245 | ||
8de307e0 | 246 | \f |
f595cb19 MK |
247 | /* There is a fair number of calling conventions that are in somewhat |
248 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
249 | coprocessor. All function return values are stored in %d0/%d1. | |
250 | Structures are returned in a static buffer, a pointer to which is | |
251 | returned in %d0. This means that functions returning a structure | |
252 | are not re-entrant. To avoid this problem some systems use a | |
253 | convention where the caller passes a pointer to a buffer in %a1 | |
254 | where the return values is to be stored. This convention is the | |
255 | default, and is implemented in the function m68k_return_value. | |
256 | ||
257 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
258 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
259 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
260 | psABI. Integer values are returned in %d0/%d1, pointer return | |
261 | values in %a0 and floating values in %fp0. When calling functions | |
262 | returning a structure the caller should pass a pointer to a buffer | |
263 | for the return value in %a0. This convention is implemented in the | |
264 | function m68k_svr4_return_value, and by appropriately setting the | |
265 | struct_value_regnum member of `struct gdbarch_tdep'. | |
266 | ||
267 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
268 | for passing the structure return value buffer. | |
269 | ||
270 | GCC can also generate code where small structures are returned in | |
271 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
272 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
273 | embedded systems. This convention is implemented by setting the | |
274 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
275 | ||
276 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 277 | into VALBUF. */ |
942dc0e9 GS |
278 | |
279 | static void | |
8de307e0 | 280 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 281 | gdb_byte *valbuf) |
942dc0e9 | 282 | { |
8de307e0 | 283 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 284 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 285 | |
8de307e0 AS |
286 | if (len <= 4) |
287 | { | |
288 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
289 | memcpy (valbuf, buf + (4 - len), len); | |
290 | } | |
291 | else if (len <= 8) | |
292 | { | |
293 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
294 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 295 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
296 | } |
297 | else | |
298 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 299 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
300 | } |
301 | ||
942dc0e9 | 302 | static void |
f595cb19 | 303 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 304 | gdb_byte *valbuf) |
942dc0e9 | 305 | { |
8de307e0 | 306 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 307 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
308 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
309 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
942dc0e9 | 310 | |
8ed86d01 | 311 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 312 | { |
c984b7ff | 313 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f595cb19 | 314 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 315 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 316 | } |
f595cb19 MK |
317 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
318 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
319 | else | |
320 | m68k_extract_return_value (type, regcache, valbuf); | |
321 | } | |
322 | ||
323 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
324 | ||
325 | static void | |
326 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 327 | const gdb_byte *valbuf) |
f595cb19 MK |
328 | { |
329 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 330 | |
8de307e0 AS |
331 | if (len <= 4) |
332 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
333 | else if (len <= 8) | |
334 | { | |
f595cb19 | 335 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 336 | len - 4, valbuf); |
f5cf7aa1 | 337 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
338 | } |
339 | else | |
340 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 341 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 342 | } |
942dc0e9 | 343 | |
f595cb19 MK |
344 | static void |
345 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 346 | const gdb_byte *valbuf) |
942dc0e9 | 347 | { |
f595cb19 | 348 | int len = TYPE_LENGTH (type); |
c984b7ff UW |
349 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
350 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
8de307e0 | 351 | |
8ed86d01 | 352 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 353 | { |
c984b7ff | 354 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f5cf7aa1 | 355 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 356 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
357 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
358 | } | |
359 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
360 | { | |
361 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
362 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
363 | } | |
364 | else | |
365 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
366 | } |
367 | ||
f595cb19 MK |
368 | /* Return non-zero if TYPE, which is assumed to be a structure or |
369 | union type, should be returned in registers for architecture | |
370 | GDBARCH. */ | |
371 | ||
c481dac7 | 372 | static int |
f595cb19 | 373 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 374 | { |
f595cb19 MK |
375 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
376 | enum type_code code = TYPE_CODE (type); | |
377 | int len = TYPE_LENGTH (type); | |
c481dac7 | 378 | |
f595cb19 MK |
379 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
380 | ||
381 | if (tdep->struct_return == pcc_struct_return) | |
382 | return 0; | |
383 | ||
384 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
385 | } |
386 | ||
f595cb19 MK |
387 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
388 | should be returned. If it is supposed to be returned in registers, | |
389 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
390 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
391 | from WRITEBUF into REGCACHE. */ | |
392 | ||
393 | static enum return_value_convention | |
c055b101 CV |
394 | m68k_return_value (struct gdbarch *gdbarch, struct type *func_type, |
395 | struct type *type, struct regcache *regcache, | |
396 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
397 | { |
398 | enum type_code code = TYPE_CODE (type); | |
399 | ||
1c845060 MK |
400 | /* GCC returns a `long double' in memory too. */ |
401 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
402 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
403 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
404 | { | |
405 | /* The default on m68k is to return structures in static memory. | |
406 | Consequently a function must return the address where we can | |
407 | find the return value. */ | |
f595cb19 | 408 | |
1c845060 MK |
409 | if (readbuf) |
410 | { | |
411 | ULONGEST addr; | |
412 | ||
413 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
414 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
415 | } | |
416 | ||
417 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
418 | } | |
f595cb19 MK |
419 | |
420 | if (readbuf) | |
421 | m68k_extract_return_value (type, regcache, readbuf); | |
422 | if (writebuf) | |
423 | m68k_store_return_value (type, regcache, writebuf); | |
424 | ||
425 | return RETURN_VALUE_REGISTER_CONVENTION; | |
426 | } | |
427 | ||
428 | static enum return_value_convention | |
c055b101 CV |
429 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *func_type, |
430 | struct type *type, struct regcache *regcache, | |
431 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
432 | { |
433 | enum type_code code = TYPE_CODE (type); | |
434 | ||
435 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
436 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
437 | { |
438 | /* The System V ABI says that: | |
439 | ||
440 | "A function returning a structure or union also sets %a0 to | |
441 | the value it finds in %a0. Thus when the caller receives | |
442 | control again, the address of the returned object resides in | |
443 | register %a0." | |
444 | ||
445 | So the ABI guarantees that we can always find the return | |
446 | value just after the function has returned. */ | |
447 | ||
448 | if (readbuf) | |
449 | { | |
450 | ULONGEST addr; | |
451 | ||
452 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
453 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
454 | } | |
455 | ||
456 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
457 | } | |
f595cb19 MK |
458 | |
459 | /* This special case is for structures consisting of a single | |
460 | `float' or `double' member. These structures are returned in | |
461 | %fp0. For these structures, we call ourselves recursively, | |
462 | changing TYPE into the type of the first member of the structure. | |
463 | Since that should work for all structures that have only one | |
464 | member, we don't bother to check the member's type here. */ | |
465 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
466 | { | |
467 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
c055b101 | 468 | return m68k_svr4_return_value (gdbarch, func_type, type, regcache, |
f595cb19 MK |
469 | readbuf, writebuf); |
470 | } | |
471 | ||
472 | if (readbuf) | |
473 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
474 | if (writebuf) | |
475 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
476 | ||
477 | return RETURN_VALUE_REGISTER_CONVENTION; | |
478 | } | |
479 | \f | |
392a587b | 480 | |
9bb47d95 NS |
481 | /* Always align the frame to a 4-byte boundary. This is required on |
482 | coldfire and harmless on the rest. */ | |
483 | ||
484 | static CORE_ADDR | |
485 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
486 | { | |
487 | /* Align the stack to four bytes. */ | |
488 | return sp & ~3; | |
489 | } | |
490 | ||
8de307e0 | 491 | static CORE_ADDR |
7d9b040b | 492 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
493 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
494 | struct value **args, CORE_ADDR sp, int struct_return, | |
495 | CORE_ADDR struct_addr) | |
7f8e7424 | 496 | { |
f595cb19 | 497 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
f5cf7aa1 | 498 | gdb_byte buf[4]; |
8de307e0 AS |
499 | int i; |
500 | ||
501 | /* Push arguments in reverse order. */ | |
502 | for (i = nargs - 1; i >= 0; i--) | |
503 | { | |
4754a64e | 504 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 505 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 506 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
507 | int offset; |
508 | ||
509 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
510 | right aligned. */ | |
511 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
512 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
513 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
514 | && len > 4) | |
515 | offset = 0; | |
516 | else | |
517 | offset = container_len - len; | |
8de307e0 | 518 | sp -= container_len; |
46615f07 | 519 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
520 | } |
521 | ||
c481dac7 | 522 | /* Store struct value address. */ |
8de307e0 AS |
523 | if (struct_return) |
524 | { | |
8de307e0 | 525 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 526 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
527 | } |
528 | ||
529 | /* Store return address. */ | |
530 | sp -= 4; | |
531 | store_unsigned_integer (buf, 4, bp_addr); | |
532 | write_memory (sp, buf, 4); | |
533 | ||
534 | /* Finally, update the stack pointer... */ | |
535 | store_unsigned_integer (buf, 4, sp); | |
536 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
537 | ||
538 | /* ...and fake a frame pointer. */ | |
539 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
540 | ||
541 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
542 | frame's CFA. */ | |
543 | return sp + 8; | |
7f8e7424 | 544 | } |
6dd0fba6 NS |
545 | |
546 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
547 | ||
548 | static int | |
d3f73121 | 549 | m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
6dd0fba6 NS |
550 | { |
551 | if (num < 8) | |
552 | /* d0..7 */ | |
553 | return (num - 0) + M68K_D0_REGNUM; | |
554 | else if (num < 16) | |
555 | /* a0..7 */ | |
556 | return (num - 8) + M68K_A0_REGNUM; | |
d3f73121 | 557 | else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present) |
6dd0fba6 NS |
558 | /* fp0..7 */ |
559 | return (num - 16) + M68K_FP0_REGNUM; | |
560 | else if (num == 25) | |
561 | /* pc */ | |
562 | return M68K_PC_REGNUM; | |
563 | else | |
d3f73121 | 564 | return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
6dd0fba6 NS |
565 | } |
566 | ||
8de307e0 AS |
567 | \f |
568 | struct m68k_frame_cache | |
569 | { | |
570 | /* Base address. */ | |
571 | CORE_ADDR base; | |
572 | CORE_ADDR sp_offset; | |
573 | CORE_ADDR pc; | |
7f8e7424 | 574 | |
8de307e0 AS |
575 | /* Saved registers. */ |
576 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
577 | CORE_ADDR saved_sp; | |
7f8e7424 | 578 | |
8de307e0 AS |
579 | /* Stack space reserved for local variables. */ |
580 | long locals; | |
581 | }; | |
c906108c | 582 | |
8de307e0 AS |
583 | /* Allocate and initialize a frame cache. */ |
584 | ||
585 | static struct m68k_frame_cache * | |
586 | m68k_alloc_frame_cache (void) | |
c906108c | 587 | { |
8de307e0 AS |
588 | struct m68k_frame_cache *cache; |
589 | int i; | |
c906108c | 590 | |
8de307e0 | 591 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 592 | |
8de307e0 AS |
593 | /* Base address. */ |
594 | cache->base = 0; | |
595 | cache->sp_offset = -4; | |
596 | cache->pc = 0; | |
c906108c | 597 | |
8de307e0 AS |
598 | /* Saved registers. We initialize these to -1 since zero is a valid |
599 | offset (that's where %fp is supposed to be stored). */ | |
600 | for (i = 0; i < M68K_NUM_REGS; i++) | |
601 | cache->saved_regs[i] = -1; | |
602 | ||
603 | /* Frameless until proven otherwise. */ | |
604 | cache->locals = -1; | |
605 | ||
606 | return cache; | |
c906108c SS |
607 | } |
608 | ||
8de307e0 AS |
609 | /* Check whether PC points at a code that sets up a new stack frame. |
610 | If so, it updates CACHE and returns the address of the first | |
611 | instruction after the sequence that sets removes the "hidden" | |
612 | argument from the stack or CURRENT_PC, whichever is smaller. | |
613 | Otherwise, return PC. */ | |
c906108c | 614 | |
8de307e0 AS |
615 | static CORE_ADDR |
616 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
617 | struct m68k_frame_cache *cache) | |
c906108c | 618 | { |
8de307e0 AS |
619 | int op; |
620 | ||
621 | if (pc >= current_pc) | |
622 | return current_pc; | |
c906108c | 623 | |
8de307e0 AS |
624 | op = read_memory_unsigned_integer (pc, 2); |
625 | ||
626 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 627 | { |
8de307e0 AS |
628 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
629 | cache->sp_offset += 4; | |
630 | if (op == P_LINKW_FP) | |
631 | { | |
632 | /* link.w %fp, #-N */ | |
633 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
634 | cache->locals = -read_memory_integer (pc + 2, 2); | |
635 | ||
636 | if (pc + 4 < current_pc && cache->locals == 0) | |
637 | { | |
638 | op = read_memory_unsigned_integer (pc + 4, 2); | |
639 | if (op == P_ADDAL_SP) | |
640 | { | |
641 | cache->locals = read_memory_integer (pc + 6, 4); | |
642 | return pc + 10; | |
643 | } | |
644 | } | |
645 | ||
646 | return pc + 4; | |
647 | } | |
648 | else if (op == P_LINKL_FP) | |
c906108c | 649 | { |
8de307e0 AS |
650 | /* link.l %fp, #-N */ |
651 | cache->locals = -read_memory_integer (pc + 2, 4); | |
652 | return pc + 6; | |
653 | } | |
654 | else | |
655 | { | |
656 | /* pea (%fp); movea.l %sp, %fp */ | |
657 | cache->locals = 0; | |
658 | ||
659 | if (pc + 2 < current_pc) | |
660 | { | |
661 | op = read_memory_unsigned_integer (pc + 2, 2); | |
662 | ||
663 | if (op == P_MOVEAL_SP_FP) | |
664 | { | |
665 | /* move.l %sp, %fp */ | |
666 | return pc + 4; | |
667 | } | |
668 | } | |
669 | ||
670 | return pc + 2; | |
c906108c SS |
671 | } |
672 | } | |
8de307e0 | 673 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 674 | { |
8de307e0 AS |
675 | /* subq.[wl] #N,%sp */ |
676 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
677 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
678 | if (pc + 2 < current_pc) | |
c906108c | 679 | { |
8de307e0 AS |
680 | op = read_memory_unsigned_integer (pc + 2, 2); |
681 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
682 | { | |
683 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
684 | return pc + 4; | |
685 | } | |
c906108c | 686 | } |
8de307e0 AS |
687 | return pc + 2; |
688 | } | |
689 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
690 | { | |
691 | /* adda.w #-N,%sp */ | |
692 | /* lea (-N,%sp),%sp */ | |
693 | cache->locals = -read_memory_integer (pc + 2, 2); | |
694 | return pc + 4; | |
c906108c | 695 | } |
8de307e0 | 696 | else if (op == P_ADDAL_SP) |
c906108c | 697 | { |
8de307e0 AS |
698 | /* adda.l #-N,%sp */ |
699 | cache->locals = -read_memory_integer (pc + 2, 4); | |
700 | return pc + 6; | |
c906108c | 701 | } |
8de307e0 AS |
702 | |
703 | return pc; | |
c906108c | 704 | } |
c5aa993b | 705 | |
8de307e0 AS |
706 | /* Check whether PC points at code that saves registers on the stack. |
707 | If so, it updates CACHE and returns the address of the first | |
708 | instruction after the register saves or CURRENT_PC, whichever is | |
709 | smaller. Otherwise, return PC. */ | |
c906108c | 710 | |
8de307e0 | 711 | static CORE_ADDR |
be8626e0 MD |
712 | m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc, |
713 | CORE_ADDR current_pc, | |
8de307e0 AS |
714 | struct m68k_frame_cache *cache) |
715 | { | |
716 | if (cache->locals >= 0) | |
717 | { | |
718 | CORE_ADDR offset; | |
719 | int op; | |
720 | int i, mask, regno; | |
c906108c | 721 | |
8de307e0 AS |
722 | offset = -4 - cache->locals; |
723 | while (pc < current_pc) | |
724 | { | |
725 | op = read_memory_unsigned_integer (pc, 2); | |
8ed86d01 | 726 | if (op == P_FMOVEMX_SP |
be8626e0 | 727 | && gdbarch_tdep (gdbarch)->fpregs_present) |
8de307e0 AS |
728 | { |
729 | /* fmovem.x REGS,-(%sp) */ | |
730 | op = read_memory_unsigned_integer (pc + 2, 2); | |
731 | if ((op & 0xff00) == 0xe000) | |
732 | { | |
733 | mask = op & 0xff; | |
734 | for (i = 0; i < 16; i++, mask >>= 1) | |
735 | { | |
736 | if (mask & 1) | |
737 | { | |
738 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
739 | offset -= 12; | |
740 | } | |
741 | } | |
742 | pc += 4; | |
743 | } | |
744 | else | |
745 | break; | |
746 | } | |
0ba5a932 | 747 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
748 | { |
749 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 750 | regno = op & 017; |
8de307e0 AS |
751 | cache->saved_regs[regno] = offset; |
752 | offset -= 4; | |
753 | pc += 2; | |
754 | } | |
755 | else if (op == P_MOVEML_SP) | |
756 | { | |
757 | /* movem.l REGS,-(%sp) */ | |
758 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
759 | for (i = 0; i < 16; i++, mask >>= 1) | |
760 | { | |
761 | if (mask & 1) | |
762 | { | |
763 | cache->saved_regs[15 - i] = offset; | |
764 | offset -= 4; | |
765 | } | |
766 | } | |
767 | pc += 4; | |
768 | } | |
769 | else | |
770 | break; | |
771 | } | |
772 | } | |
773 | ||
774 | return pc; | |
775 | } | |
c906108c | 776 | |
c906108c | 777 | |
8de307e0 AS |
778 | /* Do a full analysis of the prologue at PC and update CACHE |
779 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
780 | address where the analysis stopped. | |
c906108c | 781 | |
8de307e0 | 782 | We handle all cases that can be generated by gcc. |
c906108c | 783 | |
8de307e0 | 784 | For allocating a stack frame: |
c906108c | 785 | |
8de307e0 AS |
786 | link.w %a6,#-N |
787 | link.l %a6,#-N | |
788 | pea (%fp); move.l %sp,%fp | |
789 | link.w %a6,#0; add.l #-N,%sp | |
790 | subq.l #N,%sp | |
791 | subq.w #N,%sp | |
792 | subq.w #8,%sp; subq.w #N-8,%sp | |
793 | add.w #-N,%sp | |
794 | lea (-N,%sp),%sp | |
795 | add.l #-N,%sp | |
c906108c | 796 | |
8de307e0 | 797 | For saving registers: |
c906108c | 798 | |
8de307e0 AS |
799 | fmovem.x REGS,-(%sp) |
800 | move.l R1,-(%sp) | |
801 | move.l R1,-(%sp); move.l R2,-(%sp) | |
802 | movem.l REGS,-(%sp) | |
c906108c | 803 | |
8de307e0 | 804 | For setting up the PIC register: |
c906108c | 805 | |
8de307e0 | 806 | lea (%pc,N),%a5 |
c906108c | 807 | |
8de307e0 | 808 | */ |
c906108c | 809 | |
eb2e12d7 | 810 | static CORE_ADDR |
be8626e0 MD |
811 | m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
812 | CORE_ADDR current_pc, struct m68k_frame_cache *cache) | |
c906108c | 813 | { |
8de307e0 | 814 | unsigned int op; |
c906108c | 815 | |
8de307e0 | 816 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
be8626e0 | 817 | pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache); |
8de307e0 AS |
818 | if (pc >= current_pc) |
819 | return current_pc; | |
c906108c | 820 | |
8de307e0 AS |
821 | /* Check for GOT setup. */ |
822 | op = read_memory_unsigned_integer (pc, 4); | |
823 | if (op == P_LEA_PC_A5) | |
c906108c | 824 | { |
8de307e0 | 825 | /* lea (%pc,N),%a5 */ |
e4d8bc08 | 826 | return pc + 8; |
c906108c | 827 | } |
8de307e0 AS |
828 | |
829 | return pc; | |
c906108c SS |
830 | } |
831 | ||
8de307e0 | 832 | /* Return PC of first real instruction. */ |
7f8e7424 | 833 | |
8de307e0 | 834 | static CORE_ADDR |
6093d2eb | 835 | m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
c906108c | 836 | { |
8de307e0 AS |
837 | struct m68k_frame_cache cache; |
838 | CORE_ADDR pc; | |
839 | int op; | |
c906108c | 840 | |
8de307e0 | 841 | cache.locals = -1; |
be8626e0 | 842 | pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache); |
8de307e0 AS |
843 | if (cache.locals < 0) |
844 | return start_pc; | |
845 | return pc; | |
846 | } | |
c906108c | 847 | |
8de307e0 AS |
848 | static CORE_ADDR |
849 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
850 | { | |
f5cf7aa1 | 851 | gdb_byte buf[8]; |
7f8e7424 | 852 | |
c984b7ff | 853 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
0dfff4cb | 854 | return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
8de307e0 AS |
855 | } |
856 | \f | |
857 | /* Normal frames. */ | |
7f8e7424 | 858 | |
8de307e0 | 859 | static struct m68k_frame_cache * |
f36bf22c | 860 | m68k_frame_cache (struct frame_info *this_frame, void **this_cache) |
8de307e0 AS |
861 | { |
862 | struct m68k_frame_cache *cache; | |
f5cf7aa1 | 863 | gdb_byte buf[4]; |
8de307e0 AS |
864 | int i; |
865 | ||
866 | if (*this_cache) | |
867 | return *this_cache; | |
868 | ||
869 | cache = m68k_alloc_frame_cache (); | |
870 | *this_cache = cache; | |
871 | ||
872 | /* In principle, for normal frames, %fp holds the frame pointer, | |
873 | which holds the base address for the current stack frame. | |
874 | However, for functions that don't need it, the frame pointer is | |
875 | optional. For these "frameless" functions the frame pointer is | |
876 | actually the frame pointer of the calling frame. Signal | |
877 | trampolines are just a special case of a "frameless" function. | |
878 | They (usually) share their frame pointer with the frame that was | |
879 | in progress when the signal occurred. */ | |
880 | ||
f36bf22c | 881 | get_frame_register (this_frame, M68K_FP_REGNUM, buf); |
8de307e0 AS |
882 | cache->base = extract_unsigned_integer (buf, 4); |
883 | if (cache->base == 0) | |
884 | return cache; | |
885 | ||
886 | /* For normal frames, %pc is stored at 4(%fp). */ | |
887 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
888 | ||
f36bf22c | 889 | cache->pc = get_frame_func (this_frame); |
8de307e0 | 890 | if (cache->pc != 0) |
f36bf22c AS |
891 | m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
892 | get_frame_pc (this_frame), cache); | |
8de307e0 AS |
893 | |
894 | if (cache->locals < 0) | |
895 | { | |
896 | /* We didn't find a valid frame, which means that CACHE->base | |
897 | currently holds the frame pointer for our calling frame. If | |
898 | we're at the start of a function, or somewhere half-way its | |
899 | prologue, the function's frame probably hasn't been fully | |
900 | setup yet. Try to reconstruct the base address for the stack | |
901 | frame by looking at the stack pointer. For truly "frameless" | |
902 | functions this might work too. */ | |
903 | ||
f36bf22c | 904 | get_frame_register (this_frame, M68K_SP_REGNUM, buf); |
8de307e0 AS |
905 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; |
906 | } | |
7f8e7424 | 907 | |
8de307e0 AS |
908 | /* Now that we have the base address for the stack frame we can |
909 | calculate the value of %sp in the calling frame. */ | |
910 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 911 | |
8de307e0 AS |
912 | /* Adjust all the saved registers such that they contain addresses |
913 | instead of offsets. */ | |
914 | for (i = 0; i < M68K_NUM_REGS; i++) | |
915 | if (cache->saved_regs[i] != -1) | |
916 | cache->saved_regs[i] += cache->base; | |
c906108c | 917 | |
8de307e0 AS |
918 | return cache; |
919 | } | |
c906108c | 920 | |
8de307e0 | 921 | static void |
f36bf22c | 922 | m68k_frame_this_id (struct frame_info *this_frame, void **this_cache, |
8de307e0 AS |
923 | struct frame_id *this_id) |
924 | { | |
f36bf22c | 925 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
c906108c | 926 | |
8de307e0 AS |
927 | /* This marks the outermost frame. */ |
928 | if (cache->base == 0) | |
929 | return; | |
c5aa993b | 930 | |
8de307e0 AS |
931 | /* See the end of m68k_push_dummy_call. */ |
932 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
933 | } | |
c5aa993b | 934 | |
f36bf22c AS |
935 | static struct value * |
936 | m68k_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
937 | int regnum) | |
8de307e0 | 938 | { |
f36bf22c | 939 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
940 | |
941 | gdb_assert (regnum >= 0); | |
942 | ||
943 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
f36bf22c | 944 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
8de307e0 AS |
945 | |
946 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
f36bf22c AS |
947 | return frame_unwind_got_memory (this_frame, regnum, |
948 | cache->saved_regs[regnum]); | |
8de307e0 | 949 | |
f36bf22c | 950 | return frame_unwind_got_register (this_frame, regnum, regnum); |
8de307e0 AS |
951 | } |
952 | ||
953 | static const struct frame_unwind m68k_frame_unwind = | |
954 | { | |
955 | NORMAL_FRAME, | |
956 | m68k_frame_this_id, | |
f36bf22c AS |
957 | m68k_frame_prev_register, |
958 | NULL, | |
959 | default_frame_sniffer | |
8de307e0 | 960 | }; |
8de307e0 | 961 | \f |
8de307e0 | 962 | static CORE_ADDR |
f36bf22c | 963 | m68k_frame_base_address (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 964 | { |
f36bf22c | 965 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
966 | |
967 | return cache->base; | |
968 | } | |
969 | ||
970 | static const struct frame_base m68k_frame_base = | |
971 | { | |
972 | &m68k_frame_unwind, | |
973 | m68k_frame_base_address, | |
974 | m68k_frame_base_address, | |
975 | m68k_frame_base_address | |
976 | }; | |
977 | ||
978 | static struct frame_id | |
f36bf22c | 979 | m68k_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
8de307e0 | 980 | { |
8de307e0 | 981 | CORE_ADDR fp; |
c906108c | 982 | |
f36bf22c | 983 | fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM); |
c906108c | 984 | |
8de307e0 | 985 | /* See the end of m68k_push_dummy_call. */ |
f36bf22c | 986 | return frame_id_build (fp + 8, get_frame_pc (this_frame)); |
8de307e0 AS |
987 | } |
988 | \f | |
c906108c | 989 | |
c906108c SS |
990 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
991 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
992 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
993 | This routine returns true on success. */ | |
994 | ||
c34d127c | 995 | static int |
60ade65d | 996 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 997 | { |
f5cf7aa1 | 998 | gdb_byte *buf; |
c906108c | 999 | CORE_ADDR sp, jb_addr; |
c984b7ff | 1000 | struct gdbarch *gdbarch = get_frame_arch (frame); |
60ade65d | 1001 | struct gdbarch_tdep *tdep = gdbarch_tdep (get_frame_arch (frame)); |
eb2e12d7 AS |
1002 | |
1003 | if (tdep->jb_pc < 0) | |
1004 | { | |
1005 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1006 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1007 | return 0; |
1008 | } | |
c906108c | 1009 | |
c984b7ff UW |
1010 | buf = alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
1011 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); | |
c906108c | 1012 | |
b5d78d39 | 1013 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
c984b7ff | 1014 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1015 | return 0; |
1016 | ||
c984b7ff | 1017 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
819844ad | 1018 | / TARGET_CHAR_BIT); |
c906108c | 1019 | |
eb2e12d7 | 1020 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c984b7ff | 1021 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1022 | return 0; |
1023 | ||
c984b7ff | 1024 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
819844ad | 1025 | / TARGET_CHAR_BIT); |
c906108c SS |
1026 | return 1; |
1027 | } | |
f595cb19 MK |
1028 | \f |
1029 | ||
1030 | /* System V Release 4 (SVR4). */ | |
1031 | ||
1032 | void | |
1033 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1034 | { | |
1035 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1036 | ||
1037 | /* SVR4 uses a different calling convention. */ | |
1038 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1039 | ||
1040 | /* SVR4 uses %a0 instead of %a1. */ | |
1041 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1042 | } | |
1043 | \f | |
c906108c | 1044 | |
152d9db6 GS |
1045 | /* Function: m68k_gdbarch_init |
1046 | Initializer function for the m68k gdbarch vector. | |
1047 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1048 | ||
1049 | static struct gdbarch * | |
1050 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1051 | { | |
1052 | struct gdbarch_tdep *tdep = NULL; | |
1053 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1054 | struct gdbarch_list *best_arch; |
1055 | struct tdesc_arch_data *tdesc_data = NULL; | |
1056 | int i; | |
1057 | enum m68k_flavour flavour = m68k_no_flavour; | |
1058 | int has_fp = 1; | |
1059 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1060 | ||
1061 | /* Check any target description for validity. */ | |
1062 | if (tdesc_has_registers (info.target_desc)) | |
1063 | { | |
1064 | const struct tdesc_feature *feature; | |
1065 | int valid_p; | |
152d9db6 | 1066 | |
8ed86d01 VP |
1067 | feature = tdesc_find_feature (info.target_desc, |
1068 | "org.gnu.gdb.m68k.core"); | |
1069 | if (feature != NULL) | |
1070 | /* Do nothing. */ | |
1071 | ; | |
1072 | ||
1073 | if (feature == NULL) | |
1074 | { | |
1075 | feature = tdesc_find_feature (info.target_desc, | |
1076 | "org.gnu.gdb.coldfire.core"); | |
1077 | if (feature != NULL) | |
1078 | flavour = m68k_coldfire_flavour; | |
1079 | } | |
1080 | ||
1081 | if (feature == NULL) | |
1082 | { | |
1083 | feature = tdesc_find_feature (info.target_desc, | |
1084 | "org.gnu.gdb.fido.core"); | |
1085 | if (feature != NULL) | |
1086 | flavour = m68k_fido_flavour; | |
1087 | } | |
1088 | ||
1089 | if (feature == NULL) | |
1090 | return NULL; | |
1091 | ||
1092 | tdesc_data = tdesc_data_alloc (); | |
1093 | ||
1094 | valid_p = 1; | |
1095 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1096 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1097 | m68k_register_names[i]); | |
1098 | ||
1099 | if (!valid_p) | |
1100 | { | |
1101 | tdesc_data_cleanup (tdesc_data); | |
1102 | return NULL; | |
1103 | } | |
1104 | ||
1105 | feature = tdesc_find_feature (info.target_desc, | |
1106 | "org.gnu.gdb.coldfire.fp"); | |
1107 | if (feature != NULL) | |
1108 | { | |
1109 | valid_p = 1; | |
1110 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1111 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1112 | m68k_register_names[i]); | |
1113 | if (!valid_p) | |
1114 | { | |
1115 | tdesc_data_cleanup (tdesc_data); | |
1116 | return NULL; | |
1117 | } | |
1118 | } | |
1119 | else | |
1120 | has_fp = 0; | |
1121 | } | |
1122 | ||
1123 | /* The mechanism for returning floating values from function | |
1124 | and the type of long double depend on whether we're | |
1125 | on ColdFire or standard m68k. */ | |
1126 | ||
4ed77933 | 1127 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1128 | { |
1129 | const bfd_arch_info_type *coldfire_arch = | |
1130 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1131 | ||
1132 | if (coldfire_arch | |
4ed77933 AS |
1133 | && ((*info.bfd_arch_info->compatible) |
1134 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1135 | flavour = m68k_coldfire_flavour; |
1136 | } | |
1137 | ||
1138 | /* If there is already a candidate, use it. */ | |
1139 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1140 | best_arch != NULL; | |
1141 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1142 | { | |
1143 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1144 | continue; | |
1145 | ||
1146 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1147 | continue; | |
1148 | ||
1149 | break; | |
1150 | } | |
152d9db6 | 1151 | |
eb2e12d7 AS |
1152 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1153 | gdbarch = gdbarch_alloc (&info, tdep); | |
8ed86d01 VP |
1154 | tdep->fpregs_present = has_fp; |
1155 | tdep->flavour = flavour; | |
152d9db6 | 1156 | |
8ed86d01 VP |
1157 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1158 | long_double_format = floatformats_ieee_double; | |
1159 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1160 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1161 | |
5d3ed2e3 | 1162 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1163 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1164 | |
1165 | /* Stack grows down. */ | |
1166 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
9bb47d95 | 1167 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1168 | |
1169 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1170 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1171 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1172 | |
6300c360 | 1173 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 | 1174 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
942dc0e9 | 1175 | |
8de307e0 | 1176 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1177 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1178 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1179 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1180 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1181 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1182 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
e47577ab MK |
1183 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1184 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1185 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1186 | |
8ed86d01 VP |
1187 | if (has_fp) |
1188 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1189 | ||
1190 | /* Try to figure out if the arch uses floating registers to return | |
1191 | floating point values from functions. */ | |
1192 | if (has_fp) | |
1193 | { | |
1194 | /* On ColdFire, floating point values are returned in D0. */ | |
1195 | if (flavour == m68k_coldfire_flavour) | |
1196 | tdep->float_return = 0; | |
1197 | else | |
1198 | tdep->float_return = 1; | |
1199 | } | |
1200 | else | |
1201 | { | |
1202 | /* No floating registers, so can't use them for returning values. */ | |
1203 | tdep->float_return = 0; | |
1204 | } | |
1205 | ||
1206 | /* Function call & return */ | |
8de307e0 | 1207 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1208 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1209 | |
8ed86d01 | 1210 | |
650fcc91 AS |
1211 | /* Disassembler. */ |
1212 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1213 | ||
eb2e12d7 AS |
1214 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1215 | tdep->jb_pc = JB_PC; | |
1216 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1217 | #else | |
1218 | tdep->jb_pc = -1; | |
1219 | #endif | |
f595cb19 | 1220 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1221 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1222 | |
1223 | /* Frame unwinder. */ | |
f36bf22c | 1224 | set_gdbarch_dummy_id (gdbarch, m68k_dummy_id); |
8de307e0 | 1225 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
3f244638 AS |
1226 | |
1227 | /* Hook in the DWARF CFI frame unwinder. */ | |
f36bf22c | 1228 | dwarf2_append_unwinders (gdbarch); |
3f244638 | 1229 | |
8de307e0 | 1230 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1231 | |
55809acb AS |
1232 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1233 | gdbarch_init_osabi (info, gdbarch); | |
1234 | ||
eb2e12d7 AS |
1235 | /* Now we have tuned the configuration, set a few final things, |
1236 | based on what the OS ABI has told us. */ | |
1237 | ||
1238 | if (tdep->jb_pc >= 0) | |
1239 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1240 | ||
f36bf22c | 1241 | frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind); |
8de307e0 | 1242 | |
8ed86d01 | 1243 | if (tdesc_data) |
7cc46491 | 1244 | tdesc_use_registers (gdbarch, info.target_desc, tdesc_data); |
8ed86d01 | 1245 | |
152d9db6 GS |
1246 | return gdbarch; |
1247 | } | |
1248 | ||
1249 | ||
1250 | static void | |
c984b7ff | 1251 | m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
152d9db6 | 1252 | { |
c984b7ff | 1253 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
152d9db6 | 1254 | |
eb2e12d7 AS |
1255 | if (tdep == NULL) |
1256 | return; | |
152d9db6 | 1257 | } |
2acceee2 | 1258 | |
a78f21af AC |
1259 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1260 | ||
c906108c | 1261 | void |
fba45db2 | 1262 | _initialize_m68k_tdep (void) |
c906108c | 1263 | { |
152d9db6 | 1264 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1265 | } |