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, |
7b6bb8da | 4 | 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
0fb0cc75 | 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 | |
025bb325 | 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 | 173 | /* Function: m68k_register_name |
025bb325 | 174 | Returns the name of the standard m68k register regnum. */ |
8ed86d01 VP |
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__, |
025bb325 MS |
181 | _("m68k_register_name: illegal register number %d"), |
182 | regnum); | |
86443c3e MK |
183 | else if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM |
184 | && gdbarch_tdep (gdbarch)->fpregs_present == 0) | |
185 | return ""; | |
5d3ed2e3 | 186 | else |
8ed86d01 | 187 | return m68k_register_names[regnum]; |
5d3ed2e3 | 188 | } |
e47577ab MK |
189 | \f |
190 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
191 | needs any special handling. */ | |
192 | ||
193 | static int | |
025bb325 MS |
194 | m68k_convert_register_p (struct gdbarch *gdbarch, |
195 | int regnum, struct type *type) | |
e47577ab | 196 | { |
0abe36f5 | 197 | if (!gdbarch_tdep (gdbarch)->fpregs_present) |
8ed86d01 | 198 | return 0; |
83acabca | 199 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7 |
3c1ac6e7 | 200 | && type != register_type (gdbarch, M68K_FP0_REGNUM)); |
e47577ab MK |
201 | } |
202 | ||
203 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
204 | return its contents in TO. */ | |
205 | ||
206 | static void | |
207 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 208 | struct type *type, gdb_byte *to) |
e47577ab | 209 | { |
f5cf7aa1 | 210 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
211 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
212 | M68K_FP0_REGNUM); | |
e47577ab MK |
213 | |
214 | /* We only support floating-point values. */ | |
215 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
216 | { | |
8a3fe4f8 AC |
217 | warning (_("Cannot convert floating-point register value " |
218 | "to non-floating-point type.")); | |
e47577ab MK |
219 | return; |
220 | } | |
221 | ||
83acabca | 222 | /* Convert to TYPE. */ |
e47577ab | 223 | get_frame_register (frame, regnum, from); |
8ed86d01 | 224 | convert_typed_floating (from, fpreg_type, to, type); |
e47577ab MK |
225 | } |
226 | ||
227 | /* Write the contents FROM of a value of type TYPE into register | |
228 | REGNUM in frame FRAME. */ | |
229 | ||
230 | static void | |
231 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 232 | struct type *type, const gdb_byte *from) |
e47577ab | 233 | { |
f5cf7aa1 | 234 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
235 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
236 | M68K_FP0_REGNUM); | |
e47577ab MK |
237 | |
238 | /* We only support floating-point values. */ | |
239 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
240 | { | |
8a3fe4f8 AC |
241 | warning (_("Cannot convert non-floating-point type " |
242 | "to floating-point register value.")); | |
e47577ab MK |
243 | return; |
244 | } | |
245 | ||
83acabca | 246 | /* Convert from TYPE. */ |
8ed86d01 | 247 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
248 | put_frame_register (frame, regnum, to); |
249 | } | |
250 | ||
8de307e0 | 251 | \f |
f595cb19 MK |
252 | /* There is a fair number of calling conventions that are in somewhat |
253 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
254 | coprocessor. All function return values are stored in %d0/%d1. | |
255 | Structures are returned in a static buffer, a pointer to which is | |
256 | returned in %d0. This means that functions returning a structure | |
257 | are not re-entrant. To avoid this problem some systems use a | |
258 | convention where the caller passes a pointer to a buffer in %a1 | |
259 | where the return values is to be stored. This convention is the | |
260 | default, and is implemented in the function m68k_return_value. | |
261 | ||
262 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
263 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
264 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
265 | psABI. Integer values are returned in %d0/%d1, pointer return | |
266 | values in %a0 and floating values in %fp0. When calling functions | |
267 | returning a structure the caller should pass a pointer to a buffer | |
268 | for the return value in %a0. This convention is implemented in the | |
269 | function m68k_svr4_return_value, and by appropriately setting the | |
270 | struct_value_regnum member of `struct gdbarch_tdep'. | |
271 | ||
272 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
273 | for passing the structure return value buffer. | |
274 | ||
275 | GCC can also generate code where small structures are returned in | |
276 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
277 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
278 | embedded systems. This convention is implemented by setting the | |
279 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
280 | ||
281 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 282 | into VALBUF. */ |
942dc0e9 GS |
283 | |
284 | static void | |
8de307e0 | 285 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 286 | gdb_byte *valbuf) |
942dc0e9 | 287 | { |
8de307e0 | 288 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 289 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 290 | |
8de307e0 AS |
291 | if (len <= 4) |
292 | { | |
293 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
294 | memcpy (valbuf, buf + (4 - len), len); | |
295 | } | |
296 | else if (len <= 8) | |
297 | { | |
298 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
299 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 300 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
301 | } |
302 | else | |
303 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 304 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
305 | } |
306 | ||
942dc0e9 | 307 | static void |
f595cb19 | 308 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 309 | gdb_byte *valbuf) |
942dc0e9 | 310 | { |
8de307e0 | 311 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 312 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
313 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
314 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
942dc0e9 | 315 | |
8ed86d01 | 316 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 317 | { |
c984b7ff | 318 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f595cb19 | 319 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 320 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 321 | } |
f595cb19 MK |
322 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
323 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
324 | else | |
325 | m68k_extract_return_value (type, regcache, valbuf); | |
326 | } | |
327 | ||
328 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
329 | ||
330 | static void | |
331 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 332 | const gdb_byte *valbuf) |
f595cb19 MK |
333 | { |
334 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 335 | |
8de307e0 AS |
336 | if (len <= 4) |
337 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
338 | else if (len <= 8) | |
339 | { | |
f595cb19 | 340 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 341 | len - 4, valbuf); |
f5cf7aa1 | 342 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
343 | } |
344 | else | |
345 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 346 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 347 | } |
942dc0e9 | 348 | |
f595cb19 MK |
349 | static void |
350 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 351 | const gdb_byte *valbuf) |
942dc0e9 | 352 | { |
f595cb19 | 353 | int len = TYPE_LENGTH (type); |
c984b7ff UW |
354 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
355 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
8de307e0 | 356 | |
8ed86d01 | 357 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 358 | { |
c984b7ff | 359 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f5cf7aa1 | 360 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 361 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
362 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
363 | } | |
364 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
365 | { | |
366 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
367 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
368 | } | |
369 | else | |
370 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
371 | } |
372 | ||
f595cb19 MK |
373 | /* Return non-zero if TYPE, which is assumed to be a structure or |
374 | union type, should be returned in registers for architecture | |
375 | GDBARCH. */ | |
376 | ||
c481dac7 | 377 | static int |
f595cb19 | 378 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 379 | { |
f595cb19 MK |
380 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
381 | enum type_code code = TYPE_CODE (type); | |
382 | int len = TYPE_LENGTH (type); | |
c481dac7 | 383 | |
f595cb19 MK |
384 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
385 | ||
386 | if (tdep->struct_return == pcc_struct_return) | |
387 | return 0; | |
388 | ||
389 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
390 | } |
391 | ||
f595cb19 MK |
392 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
393 | should be returned. If it is supposed to be returned in registers, | |
394 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
395 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
396 | from WRITEBUF into REGCACHE. */ | |
397 | ||
398 | static enum return_value_convention | |
c055b101 CV |
399 | m68k_return_value (struct gdbarch *gdbarch, struct type *func_type, |
400 | struct type *type, struct regcache *regcache, | |
401 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
402 | { |
403 | enum type_code code = TYPE_CODE (type); | |
404 | ||
1c845060 MK |
405 | /* GCC returns a `long double' in memory too. */ |
406 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
407 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
408 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
409 | { | |
410 | /* The default on m68k is to return structures in static memory. | |
411 | Consequently a function must return the address where we can | |
412 | find the return value. */ | |
f595cb19 | 413 | |
1c845060 MK |
414 | if (readbuf) |
415 | { | |
416 | ULONGEST addr; | |
417 | ||
418 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
419 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
420 | } | |
421 | ||
422 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
423 | } | |
f595cb19 MK |
424 | |
425 | if (readbuf) | |
426 | m68k_extract_return_value (type, regcache, readbuf); | |
427 | if (writebuf) | |
428 | m68k_store_return_value (type, regcache, writebuf); | |
429 | ||
430 | return RETURN_VALUE_REGISTER_CONVENTION; | |
431 | } | |
432 | ||
433 | static enum return_value_convention | |
c055b101 CV |
434 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *func_type, |
435 | struct type *type, struct regcache *regcache, | |
436 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
437 | { |
438 | enum type_code code = TYPE_CODE (type); | |
439 | ||
440 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
441 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
442 | { |
443 | /* The System V ABI says that: | |
444 | ||
445 | "A function returning a structure or union also sets %a0 to | |
446 | the value it finds in %a0. Thus when the caller receives | |
447 | control again, the address of the returned object resides in | |
448 | register %a0." | |
449 | ||
450 | So the ABI guarantees that we can always find the return | |
451 | value just after the function has returned. */ | |
452 | ||
453 | if (readbuf) | |
454 | { | |
455 | ULONGEST addr; | |
456 | ||
457 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
458 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
459 | } | |
460 | ||
461 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
462 | } | |
f595cb19 MK |
463 | |
464 | /* This special case is for structures consisting of a single | |
465 | `float' or `double' member. These structures are returned in | |
466 | %fp0. For these structures, we call ourselves recursively, | |
467 | changing TYPE into the type of the first member of the structure. | |
468 | Since that should work for all structures that have only one | |
469 | member, we don't bother to check the member's type here. */ | |
470 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
471 | { | |
472 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
c055b101 | 473 | return m68k_svr4_return_value (gdbarch, func_type, type, regcache, |
f595cb19 MK |
474 | readbuf, writebuf); |
475 | } | |
476 | ||
477 | if (readbuf) | |
478 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
479 | if (writebuf) | |
480 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
481 | ||
482 | return RETURN_VALUE_REGISTER_CONVENTION; | |
483 | } | |
484 | \f | |
392a587b | 485 | |
9bb47d95 NS |
486 | /* Always align the frame to a 4-byte boundary. This is required on |
487 | coldfire and harmless on the rest. */ | |
488 | ||
489 | static CORE_ADDR | |
490 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
491 | { | |
492 | /* Align the stack to four bytes. */ | |
493 | return sp & ~3; | |
494 | } | |
495 | ||
8de307e0 | 496 | static CORE_ADDR |
7d9b040b | 497 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
498 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
499 | struct value **args, CORE_ADDR sp, int struct_return, | |
500 | CORE_ADDR struct_addr) | |
7f8e7424 | 501 | { |
f595cb19 | 502 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 503 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
f5cf7aa1 | 504 | gdb_byte buf[4]; |
8de307e0 AS |
505 | int i; |
506 | ||
507 | /* Push arguments in reverse order. */ | |
508 | for (i = nargs - 1; i >= 0; i--) | |
509 | { | |
4754a64e | 510 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 511 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 512 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
513 | int offset; |
514 | ||
515 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
516 | right aligned. */ | |
517 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
518 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
519 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
520 | && len > 4) | |
521 | offset = 0; | |
522 | else | |
523 | offset = container_len - len; | |
8de307e0 | 524 | sp -= container_len; |
46615f07 | 525 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
526 | } |
527 | ||
c481dac7 | 528 | /* Store struct value address. */ |
8de307e0 AS |
529 | if (struct_return) |
530 | { | |
e17a4113 | 531 | store_unsigned_integer (buf, 4, byte_order, struct_addr); |
f595cb19 | 532 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
533 | } |
534 | ||
535 | /* Store return address. */ | |
536 | sp -= 4; | |
e17a4113 | 537 | store_unsigned_integer (buf, 4, byte_order, bp_addr); |
8de307e0 AS |
538 | write_memory (sp, buf, 4); |
539 | ||
540 | /* Finally, update the stack pointer... */ | |
e17a4113 | 541 | store_unsigned_integer (buf, 4, byte_order, sp); |
8de307e0 AS |
542 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); |
543 | ||
544 | /* ...and fake a frame pointer. */ | |
545 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
546 | ||
547 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
548 | frame's CFA. */ | |
549 | return sp + 8; | |
7f8e7424 | 550 | } |
6dd0fba6 NS |
551 | |
552 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
553 | ||
554 | static int | |
d3f73121 | 555 | m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
6dd0fba6 NS |
556 | { |
557 | if (num < 8) | |
558 | /* d0..7 */ | |
559 | return (num - 0) + M68K_D0_REGNUM; | |
560 | else if (num < 16) | |
561 | /* a0..7 */ | |
562 | return (num - 8) + M68K_A0_REGNUM; | |
d3f73121 | 563 | else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present) |
6dd0fba6 NS |
564 | /* fp0..7 */ |
565 | return (num - 16) + M68K_FP0_REGNUM; | |
566 | else if (num == 25) | |
567 | /* pc */ | |
568 | return M68K_PC_REGNUM; | |
569 | else | |
d3f73121 | 570 | return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
6dd0fba6 NS |
571 | } |
572 | ||
8de307e0 AS |
573 | \f |
574 | struct m68k_frame_cache | |
575 | { | |
576 | /* Base address. */ | |
577 | CORE_ADDR base; | |
578 | CORE_ADDR sp_offset; | |
579 | CORE_ADDR pc; | |
7f8e7424 | 580 | |
8de307e0 AS |
581 | /* Saved registers. */ |
582 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
583 | CORE_ADDR saved_sp; | |
7f8e7424 | 584 | |
8de307e0 AS |
585 | /* Stack space reserved for local variables. */ |
586 | long locals; | |
587 | }; | |
c906108c | 588 | |
8de307e0 AS |
589 | /* Allocate and initialize a frame cache. */ |
590 | ||
591 | static struct m68k_frame_cache * | |
592 | m68k_alloc_frame_cache (void) | |
c906108c | 593 | { |
8de307e0 AS |
594 | struct m68k_frame_cache *cache; |
595 | int i; | |
c906108c | 596 | |
8de307e0 | 597 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 598 | |
8de307e0 AS |
599 | /* Base address. */ |
600 | cache->base = 0; | |
601 | cache->sp_offset = -4; | |
602 | cache->pc = 0; | |
c906108c | 603 | |
8de307e0 AS |
604 | /* Saved registers. We initialize these to -1 since zero is a valid |
605 | offset (that's where %fp is supposed to be stored). */ | |
606 | for (i = 0; i < M68K_NUM_REGS; i++) | |
607 | cache->saved_regs[i] = -1; | |
608 | ||
609 | /* Frameless until proven otherwise. */ | |
610 | cache->locals = -1; | |
611 | ||
612 | return cache; | |
c906108c SS |
613 | } |
614 | ||
8de307e0 AS |
615 | /* Check whether PC points at a code that sets up a new stack frame. |
616 | If so, it updates CACHE and returns the address of the first | |
617 | instruction after the sequence that sets removes the "hidden" | |
618 | argument from the stack or CURRENT_PC, whichever is smaller. | |
619 | Otherwise, return PC. */ | |
c906108c | 620 | |
8de307e0 | 621 | static CORE_ADDR |
e17a4113 UW |
622 | m68k_analyze_frame_setup (struct gdbarch *gdbarch, |
623 | CORE_ADDR pc, CORE_ADDR current_pc, | |
8de307e0 | 624 | struct m68k_frame_cache *cache) |
c906108c | 625 | { |
e17a4113 | 626 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 AS |
627 | int op; |
628 | ||
629 | if (pc >= current_pc) | |
630 | return current_pc; | |
c906108c | 631 | |
e17a4113 | 632 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8de307e0 AS |
633 | |
634 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 635 | { |
8de307e0 AS |
636 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
637 | cache->sp_offset += 4; | |
638 | if (op == P_LINKW_FP) | |
639 | { | |
640 | /* link.w %fp, #-N */ | |
641 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
e17a4113 | 642 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
643 | |
644 | if (pc + 4 < current_pc && cache->locals == 0) | |
645 | { | |
e17a4113 | 646 | op = read_memory_unsigned_integer (pc + 4, 2, byte_order); |
8de307e0 AS |
647 | if (op == P_ADDAL_SP) |
648 | { | |
e17a4113 | 649 | cache->locals = read_memory_integer (pc + 6, 4, byte_order); |
8de307e0 AS |
650 | return pc + 10; |
651 | } | |
652 | } | |
653 | ||
654 | return pc + 4; | |
655 | } | |
656 | else if (op == P_LINKL_FP) | |
c906108c | 657 | { |
8de307e0 | 658 | /* link.l %fp, #-N */ |
e17a4113 | 659 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 AS |
660 | return pc + 6; |
661 | } | |
662 | else | |
663 | { | |
664 | /* pea (%fp); movea.l %sp, %fp */ | |
665 | cache->locals = 0; | |
666 | ||
667 | if (pc + 2 < current_pc) | |
668 | { | |
e17a4113 | 669 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
670 | |
671 | if (op == P_MOVEAL_SP_FP) | |
672 | { | |
673 | /* move.l %sp, %fp */ | |
674 | return pc + 4; | |
675 | } | |
676 | } | |
677 | ||
678 | return pc + 2; | |
c906108c SS |
679 | } |
680 | } | |
8de307e0 | 681 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 682 | { |
8de307e0 AS |
683 | /* subq.[wl] #N,%sp */ |
684 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
685 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
686 | if (pc + 2 < current_pc) | |
c906108c | 687 | { |
e17a4113 | 688 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
689 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
690 | { | |
691 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
692 | return pc + 4; | |
693 | } | |
c906108c | 694 | } |
8de307e0 AS |
695 | return pc + 2; |
696 | } | |
697 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
698 | { | |
699 | /* adda.w #-N,%sp */ | |
700 | /* lea (-N,%sp),%sp */ | |
e17a4113 | 701 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 | 702 | return pc + 4; |
c906108c | 703 | } |
8de307e0 | 704 | else if (op == P_ADDAL_SP) |
c906108c | 705 | { |
8de307e0 | 706 | /* adda.l #-N,%sp */ |
e17a4113 | 707 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 | 708 | return pc + 6; |
c906108c | 709 | } |
8de307e0 AS |
710 | |
711 | return pc; | |
c906108c | 712 | } |
c5aa993b | 713 | |
8de307e0 AS |
714 | /* Check whether PC points at code that saves registers on the stack. |
715 | If so, it updates CACHE and returns the address of the first | |
716 | instruction after the register saves or CURRENT_PC, whichever is | |
717 | smaller. Otherwise, return PC. */ | |
c906108c | 718 | |
8de307e0 | 719 | static CORE_ADDR |
be8626e0 MD |
720 | m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc, |
721 | CORE_ADDR current_pc, | |
8de307e0 AS |
722 | struct m68k_frame_cache *cache) |
723 | { | |
e17a4113 UW |
724 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
725 | ||
8de307e0 AS |
726 | if (cache->locals >= 0) |
727 | { | |
728 | CORE_ADDR offset; | |
729 | int op; | |
730 | int i, mask, regno; | |
c906108c | 731 | |
8de307e0 AS |
732 | offset = -4 - cache->locals; |
733 | while (pc < current_pc) | |
734 | { | |
e17a4113 | 735 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8ed86d01 | 736 | if (op == P_FMOVEMX_SP |
be8626e0 | 737 | && gdbarch_tdep (gdbarch)->fpregs_present) |
8de307e0 AS |
738 | { |
739 | /* fmovem.x REGS,-(%sp) */ | |
e17a4113 | 740 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
741 | if ((op & 0xff00) == 0xe000) |
742 | { | |
743 | mask = op & 0xff; | |
744 | for (i = 0; i < 16; i++, mask >>= 1) | |
745 | { | |
746 | if (mask & 1) | |
747 | { | |
748 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
749 | offset -= 12; | |
750 | } | |
751 | } | |
752 | pc += 4; | |
753 | } | |
754 | else | |
755 | break; | |
756 | } | |
0ba5a932 | 757 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
758 | { |
759 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 760 | regno = op & 017; |
8de307e0 AS |
761 | cache->saved_regs[regno] = offset; |
762 | offset -= 4; | |
763 | pc += 2; | |
764 | } | |
765 | else if (op == P_MOVEML_SP) | |
766 | { | |
767 | /* movem.l REGS,-(%sp) */ | |
e17a4113 | 768 | mask = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
769 | for (i = 0; i < 16; i++, mask >>= 1) |
770 | { | |
771 | if (mask & 1) | |
772 | { | |
773 | cache->saved_regs[15 - i] = offset; | |
774 | offset -= 4; | |
775 | } | |
776 | } | |
777 | pc += 4; | |
778 | } | |
779 | else | |
780 | break; | |
781 | } | |
782 | } | |
783 | ||
784 | return pc; | |
785 | } | |
c906108c | 786 | |
c906108c | 787 | |
8de307e0 AS |
788 | /* Do a full analysis of the prologue at PC and update CACHE |
789 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
790 | address where the analysis stopped. | |
c906108c | 791 | |
8de307e0 | 792 | We handle all cases that can be generated by gcc. |
c906108c | 793 | |
8de307e0 | 794 | For allocating a stack frame: |
c906108c | 795 | |
8de307e0 AS |
796 | link.w %a6,#-N |
797 | link.l %a6,#-N | |
798 | pea (%fp); move.l %sp,%fp | |
799 | link.w %a6,#0; add.l #-N,%sp | |
800 | subq.l #N,%sp | |
801 | subq.w #N,%sp | |
802 | subq.w #8,%sp; subq.w #N-8,%sp | |
803 | add.w #-N,%sp | |
804 | lea (-N,%sp),%sp | |
805 | add.l #-N,%sp | |
c906108c | 806 | |
8de307e0 | 807 | For saving registers: |
c906108c | 808 | |
8de307e0 AS |
809 | fmovem.x REGS,-(%sp) |
810 | move.l R1,-(%sp) | |
811 | move.l R1,-(%sp); move.l R2,-(%sp) | |
812 | movem.l REGS,-(%sp) | |
c906108c | 813 | |
8de307e0 | 814 | For setting up the PIC register: |
c906108c | 815 | |
8de307e0 | 816 | lea (%pc,N),%a5 |
c906108c | 817 | |
8de307e0 | 818 | */ |
c906108c | 819 | |
eb2e12d7 | 820 | static CORE_ADDR |
be8626e0 MD |
821 | m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
822 | CORE_ADDR current_pc, struct m68k_frame_cache *cache) | |
c906108c | 823 | { |
e17a4113 | 824 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 | 825 | unsigned int op; |
c906108c | 826 | |
e17a4113 | 827 | pc = m68k_analyze_frame_setup (gdbarch, pc, current_pc, cache); |
be8626e0 | 828 | pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache); |
8de307e0 AS |
829 | if (pc >= current_pc) |
830 | return current_pc; | |
c906108c | 831 | |
8de307e0 | 832 | /* Check for GOT setup. */ |
e17a4113 | 833 | op = read_memory_unsigned_integer (pc, 4, byte_order); |
8de307e0 | 834 | if (op == P_LEA_PC_A5) |
c906108c | 835 | { |
8de307e0 | 836 | /* lea (%pc,N),%a5 */ |
e4d8bc08 | 837 | return pc + 8; |
c906108c | 838 | } |
8de307e0 AS |
839 | |
840 | return pc; | |
c906108c SS |
841 | } |
842 | ||
8de307e0 | 843 | /* Return PC of first real instruction. */ |
7f8e7424 | 844 | |
8de307e0 | 845 | static CORE_ADDR |
6093d2eb | 846 | m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
c906108c | 847 | { |
8de307e0 AS |
848 | struct m68k_frame_cache cache; |
849 | CORE_ADDR pc; | |
850 | int op; | |
c906108c | 851 | |
8de307e0 | 852 | cache.locals = -1; |
be8626e0 | 853 | pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache); |
8de307e0 AS |
854 | if (cache.locals < 0) |
855 | return start_pc; | |
856 | return pc; | |
857 | } | |
c906108c | 858 | |
8de307e0 AS |
859 | static CORE_ADDR |
860 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
861 | { | |
f5cf7aa1 | 862 | gdb_byte buf[8]; |
7f8e7424 | 863 | |
c984b7ff | 864 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
0dfff4cb | 865 | return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
8de307e0 AS |
866 | } |
867 | \f | |
868 | /* Normal frames. */ | |
7f8e7424 | 869 | |
8de307e0 | 870 | static struct m68k_frame_cache * |
f36bf22c | 871 | m68k_frame_cache (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 872 | { |
e17a4113 UW |
873 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
874 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8de307e0 | 875 | struct m68k_frame_cache *cache; |
f5cf7aa1 | 876 | gdb_byte buf[4]; |
8de307e0 AS |
877 | int i; |
878 | ||
879 | if (*this_cache) | |
880 | return *this_cache; | |
881 | ||
882 | cache = m68k_alloc_frame_cache (); | |
883 | *this_cache = cache; | |
884 | ||
885 | /* In principle, for normal frames, %fp holds the frame pointer, | |
886 | which holds the base address for the current stack frame. | |
887 | However, for functions that don't need it, the frame pointer is | |
888 | optional. For these "frameless" functions the frame pointer is | |
889 | actually the frame pointer of the calling frame. Signal | |
890 | trampolines are just a special case of a "frameless" function. | |
891 | They (usually) share their frame pointer with the frame that was | |
892 | in progress when the signal occurred. */ | |
893 | ||
f36bf22c | 894 | get_frame_register (this_frame, M68K_FP_REGNUM, buf); |
e17a4113 | 895 | cache->base = extract_unsigned_integer (buf, 4, byte_order); |
8de307e0 AS |
896 | if (cache->base == 0) |
897 | return cache; | |
898 | ||
899 | /* For normal frames, %pc is stored at 4(%fp). */ | |
900 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
901 | ||
f36bf22c | 902 | cache->pc = get_frame_func (this_frame); |
8de307e0 | 903 | if (cache->pc != 0) |
f36bf22c AS |
904 | m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
905 | get_frame_pc (this_frame), cache); | |
8de307e0 AS |
906 | |
907 | if (cache->locals < 0) | |
908 | { | |
909 | /* We didn't find a valid frame, which means that CACHE->base | |
910 | currently holds the frame pointer for our calling frame. If | |
911 | we're at the start of a function, or somewhere half-way its | |
912 | prologue, the function's frame probably hasn't been fully | |
913 | setup yet. Try to reconstruct the base address for the stack | |
914 | frame by looking at the stack pointer. For truly "frameless" | |
915 | functions this might work too. */ | |
916 | ||
f36bf22c | 917 | get_frame_register (this_frame, M68K_SP_REGNUM, buf); |
e17a4113 UW |
918 | cache->base = extract_unsigned_integer (buf, 4, byte_order) |
919 | + cache->sp_offset; | |
8de307e0 | 920 | } |
7f8e7424 | 921 | |
8de307e0 AS |
922 | /* Now that we have the base address for the stack frame we can |
923 | calculate the value of %sp in the calling frame. */ | |
924 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 925 | |
8de307e0 AS |
926 | /* Adjust all the saved registers such that they contain addresses |
927 | instead of offsets. */ | |
928 | for (i = 0; i < M68K_NUM_REGS; i++) | |
929 | if (cache->saved_regs[i] != -1) | |
930 | cache->saved_regs[i] += cache->base; | |
c906108c | 931 | |
8de307e0 AS |
932 | return cache; |
933 | } | |
c906108c | 934 | |
8de307e0 | 935 | static void |
f36bf22c | 936 | m68k_frame_this_id (struct frame_info *this_frame, void **this_cache, |
8de307e0 AS |
937 | struct frame_id *this_id) |
938 | { | |
f36bf22c | 939 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
c906108c | 940 | |
8de307e0 AS |
941 | /* This marks the outermost frame. */ |
942 | if (cache->base == 0) | |
943 | return; | |
c5aa993b | 944 | |
8de307e0 AS |
945 | /* See the end of m68k_push_dummy_call. */ |
946 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
947 | } | |
c5aa993b | 948 | |
f36bf22c AS |
949 | static struct value * |
950 | m68k_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
951 | int regnum) | |
8de307e0 | 952 | { |
f36bf22c | 953 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
954 | |
955 | gdb_assert (regnum >= 0); | |
956 | ||
957 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
f36bf22c | 958 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
8de307e0 AS |
959 | |
960 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
f36bf22c AS |
961 | return frame_unwind_got_memory (this_frame, regnum, |
962 | cache->saved_regs[regnum]); | |
8de307e0 | 963 | |
f36bf22c | 964 | return frame_unwind_got_register (this_frame, regnum, regnum); |
8de307e0 AS |
965 | } |
966 | ||
967 | static const struct frame_unwind m68k_frame_unwind = | |
968 | { | |
969 | NORMAL_FRAME, | |
970 | m68k_frame_this_id, | |
f36bf22c AS |
971 | m68k_frame_prev_register, |
972 | NULL, | |
973 | default_frame_sniffer | |
8de307e0 | 974 | }; |
8de307e0 | 975 | \f |
8de307e0 | 976 | static CORE_ADDR |
f36bf22c | 977 | m68k_frame_base_address (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 978 | { |
f36bf22c | 979 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
980 | |
981 | return cache->base; | |
982 | } | |
983 | ||
984 | static const struct frame_base m68k_frame_base = | |
985 | { | |
986 | &m68k_frame_unwind, | |
987 | m68k_frame_base_address, | |
988 | m68k_frame_base_address, | |
989 | m68k_frame_base_address | |
990 | }; | |
991 | ||
992 | static struct frame_id | |
f36bf22c | 993 | m68k_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
8de307e0 | 994 | { |
8de307e0 | 995 | CORE_ADDR fp; |
c906108c | 996 | |
f36bf22c | 997 | fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM); |
c906108c | 998 | |
8de307e0 | 999 | /* See the end of m68k_push_dummy_call. */ |
f36bf22c | 1000 | return frame_id_build (fp + 8, get_frame_pc (this_frame)); |
8de307e0 AS |
1001 | } |
1002 | \f | |
c906108c | 1003 | |
c906108c SS |
1004 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1005 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1006 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
025bb325 | 1007 | This routine returns true on success. */ |
c906108c | 1008 | |
c34d127c | 1009 | static int |
60ade65d | 1010 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 1011 | { |
f5cf7aa1 | 1012 | gdb_byte *buf; |
c906108c | 1013 | CORE_ADDR sp, jb_addr; |
c984b7ff | 1014 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
1015 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1016 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
eb2e12d7 AS |
1017 | |
1018 | if (tdep->jb_pc < 0) | |
1019 | { | |
1020 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1021 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1022 | return 0; |
1023 | } | |
c906108c | 1024 | |
c984b7ff UW |
1025 | buf = alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
1026 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); | |
c906108c | 1027 | |
025bb325 | 1028 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
c984b7ff | 1029 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1030 | return 0; |
1031 | ||
c984b7ff | 1032 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1033 | / TARGET_CHAR_BIT, byte_order); |
c906108c | 1034 | |
eb2e12d7 | 1035 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
e17a4113 UW |
1036 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT), |
1037 | byte_order) | |
c906108c SS |
1038 | return 0; |
1039 | ||
c984b7ff | 1040 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1041 | / TARGET_CHAR_BIT, byte_order); |
c906108c SS |
1042 | return 1; |
1043 | } | |
f595cb19 MK |
1044 | \f |
1045 | ||
1046 | /* System V Release 4 (SVR4). */ | |
1047 | ||
1048 | void | |
1049 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1050 | { | |
1051 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1052 | ||
1053 | /* SVR4 uses a different calling convention. */ | |
1054 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1055 | ||
1056 | /* SVR4 uses %a0 instead of %a1. */ | |
1057 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1058 | } | |
1059 | \f | |
c906108c | 1060 | |
152d9db6 GS |
1061 | /* Function: m68k_gdbarch_init |
1062 | Initializer function for the m68k gdbarch vector. | |
025bb325 | 1063 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
152d9db6 GS |
1064 | |
1065 | static struct gdbarch * | |
1066 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1067 | { | |
1068 | struct gdbarch_tdep *tdep = NULL; | |
1069 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1070 | struct gdbarch_list *best_arch; |
1071 | struct tdesc_arch_data *tdesc_data = NULL; | |
1072 | int i; | |
1073 | enum m68k_flavour flavour = m68k_no_flavour; | |
1074 | int has_fp = 1; | |
1075 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1076 | ||
1077 | /* Check any target description for validity. */ | |
1078 | if (tdesc_has_registers (info.target_desc)) | |
1079 | { | |
1080 | const struct tdesc_feature *feature; | |
1081 | int valid_p; | |
152d9db6 | 1082 | |
8ed86d01 VP |
1083 | feature = tdesc_find_feature (info.target_desc, |
1084 | "org.gnu.gdb.m68k.core"); | |
1085 | if (feature != NULL) | |
1086 | /* Do nothing. */ | |
1087 | ; | |
1088 | ||
1089 | if (feature == NULL) | |
1090 | { | |
1091 | feature = tdesc_find_feature (info.target_desc, | |
1092 | "org.gnu.gdb.coldfire.core"); | |
1093 | if (feature != NULL) | |
1094 | flavour = m68k_coldfire_flavour; | |
1095 | } | |
1096 | ||
1097 | if (feature == NULL) | |
1098 | { | |
1099 | feature = tdesc_find_feature (info.target_desc, | |
1100 | "org.gnu.gdb.fido.core"); | |
1101 | if (feature != NULL) | |
1102 | flavour = m68k_fido_flavour; | |
1103 | } | |
1104 | ||
1105 | if (feature == NULL) | |
1106 | return NULL; | |
1107 | ||
1108 | tdesc_data = tdesc_data_alloc (); | |
1109 | ||
1110 | valid_p = 1; | |
1111 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1112 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1113 | m68k_register_names[i]); | |
1114 | ||
1115 | if (!valid_p) | |
1116 | { | |
1117 | tdesc_data_cleanup (tdesc_data); | |
1118 | return NULL; | |
1119 | } | |
1120 | ||
1121 | feature = tdesc_find_feature (info.target_desc, | |
1122 | "org.gnu.gdb.coldfire.fp"); | |
1123 | if (feature != NULL) | |
1124 | { | |
1125 | valid_p = 1; | |
1126 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1127 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1128 | m68k_register_names[i]); | |
1129 | if (!valid_p) | |
1130 | { | |
1131 | tdesc_data_cleanup (tdesc_data); | |
1132 | return NULL; | |
1133 | } | |
1134 | } | |
1135 | else | |
1136 | has_fp = 0; | |
1137 | } | |
1138 | ||
1139 | /* The mechanism for returning floating values from function | |
1140 | and the type of long double depend on whether we're | |
025bb325 | 1141 | on ColdFire or standard m68k. */ |
8ed86d01 | 1142 | |
4ed77933 | 1143 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1144 | { |
1145 | const bfd_arch_info_type *coldfire_arch = | |
1146 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1147 | ||
1148 | if (coldfire_arch | |
4ed77933 AS |
1149 | && ((*info.bfd_arch_info->compatible) |
1150 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1151 | flavour = m68k_coldfire_flavour; |
1152 | } | |
1153 | ||
1154 | /* If there is already a candidate, use it. */ | |
1155 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1156 | best_arch != NULL; | |
1157 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1158 | { | |
1159 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1160 | continue; | |
1161 | ||
1162 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1163 | continue; | |
1164 | ||
1165 | break; | |
1166 | } | |
152d9db6 | 1167 | |
0c85e18e MK |
1168 | if (best_arch != NULL) |
1169 | { | |
1170 | if (tdesc_data != NULL) | |
1171 | tdesc_data_cleanup (tdesc_data); | |
1172 | return best_arch->gdbarch; | |
1173 | } | |
1174 | ||
1390fcc2 | 1175 | tdep = xzalloc (sizeof (struct gdbarch_tdep)); |
eb2e12d7 | 1176 | gdbarch = gdbarch_alloc (&info, tdep); |
8ed86d01 VP |
1177 | tdep->fpregs_present = has_fp; |
1178 | tdep->flavour = flavour; | |
152d9db6 | 1179 | |
8ed86d01 VP |
1180 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1181 | long_double_format = floatformats_ieee_double; | |
1182 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1183 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1184 | |
5d3ed2e3 | 1185 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1186 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 | 1187 | |
025bb325 | 1188 | /* Stack grows down. */ |
5d3ed2e3 | 1189 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
9bb47d95 | 1190 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1191 | |
1192 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1193 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1194 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1195 | |
6300c360 | 1196 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 | 1197 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
942dc0e9 | 1198 | |
8de307e0 | 1199 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1200 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1201 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1202 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1203 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1204 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
e47577ab MK |
1205 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1206 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1207 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1208 | |
8ed86d01 VP |
1209 | if (has_fp) |
1210 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1211 | ||
1212 | /* Try to figure out if the arch uses floating registers to return | |
1213 | floating point values from functions. */ | |
1214 | if (has_fp) | |
1215 | { | |
1216 | /* On ColdFire, floating point values are returned in D0. */ | |
1217 | if (flavour == m68k_coldfire_flavour) | |
1218 | tdep->float_return = 0; | |
1219 | else | |
1220 | tdep->float_return = 1; | |
1221 | } | |
1222 | else | |
1223 | { | |
1224 | /* No floating registers, so can't use them for returning values. */ | |
1225 | tdep->float_return = 0; | |
1226 | } | |
1227 | ||
025bb325 | 1228 | /* Function call & return. */ |
8de307e0 | 1229 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1230 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1231 | |
8ed86d01 | 1232 | |
650fcc91 AS |
1233 | /* Disassembler. */ |
1234 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1235 | ||
eb2e12d7 AS |
1236 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1237 | tdep->jb_pc = JB_PC; | |
1238 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1239 | #else | |
1240 | tdep->jb_pc = -1; | |
1241 | #endif | |
f595cb19 | 1242 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1243 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1244 | |
1245 | /* Frame unwinder. */ | |
f36bf22c | 1246 | set_gdbarch_dummy_id (gdbarch, m68k_dummy_id); |
8de307e0 | 1247 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
3f244638 AS |
1248 | |
1249 | /* Hook in the DWARF CFI frame unwinder. */ | |
f36bf22c | 1250 | dwarf2_append_unwinders (gdbarch); |
3f244638 | 1251 | |
8de307e0 | 1252 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1253 | |
55809acb AS |
1254 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1255 | gdbarch_init_osabi (info, gdbarch); | |
1256 | ||
eb2e12d7 AS |
1257 | /* Now we have tuned the configuration, set a few final things, |
1258 | based on what the OS ABI has told us. */ | |
1259 | ||
1260 | if (tdep->jb_pc >= 0) | |
1261 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1262 | ||
f36bf22c | 1263 | frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind); |
8de307e0 | 1264 | |
8ed86d01 | 1265 | if (tdesc_data) |
7cc46491 | 1266 | tdesc_use_registers (gdbarch, info.target_desc, tdesc_data); |
8ed86d01 | 1267 | |
152d9db6 GS |
1268 | return gdbarch; |
1269 | } | |
1270 | ||
1271 | ||
1272 | static void | |
c984b7ff | 1273 | m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
152d9db6 | 1274 | { |
c984b7ff | 1275 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
152d9db6 | 1276 | |
eb2e12d7 AS |
1277 | if (tdep == NULL) |
1278 | return; | |
152d9db6 | 1279 | } |
2acceee2 | 1280 | |
a78f21af AC |
1281 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1282 | ||
c906108c | 1283 | void |
fba45db2 | 1284 | _initialize_m68k_tdep (void) |
c906108c | 1285 | { |
152d9db6 | 1286 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1287 | } |