Commit | Line | Data |
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748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b | 2 | |
61baf725 | 3 | Copyright (C) 1990-2017 Free Software Foundation, Inc. |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 10 | (at your option) any later version. |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b | 17 | You should have received a copy of the GNU General Public License |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
19 | |
20 | #include "defs.h" | |
3f244638 | 21 | #include "dwarf2-frame.h" |
c906108c | 22 | #include "frame.h" |
8de307e0 AS |
23 | #include "frame-base.h" |
24 | #include "frame-unwind.h" | |
e6bb342a | 25 | #include "gdbtypes.h" |
c906108c SS |
26 | #include "symtab.h" |
27 | #include "gdbcore.h" | |
28 | #include "value.h" | |
7a292a7a | 29 | #include "inferior.h" |
4e052eda | 30 | #include "regcache.h" |
5d3ed2e3 | 31 | #include "arch-utils.h" |
55809acb | 32 | #include "osabi.h" |
a89aa300 | 33 | #include "dis-asm.h" |
8ed86d01 | 34 | #include "target-descriptions.h" |
32eeb91a AS |
35 | |
36 | #include "m68k-tdep.h" | |
c906108c | 37 | \f |
c5aa993b | 38 | |
89c3b6d3 PDM |
39 | #define P_LINKL_FP 0x480e |
40 | #define P_LINKW_FP 0x4e56 | |
41 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
42 | #define P_MOVEAL_SP_FP 0x2c4f |
43 | #define P_ADDAW_SP 0xdefc | |
44 | #define P_ADDAL_SP 0xdffc | |
45 | #define P_SUBQW_SP 0x514f | |
46 | #define P_SUBQL_SP 0x518f | |
47 | #define P_LEA_SP_SP 0x4fef | |
48 | #define P_LEA_PC_A5 0x4bfb0170 | |
49 | #define P_FMOVEMX_SP 0xf227 | |
50 | #define P_MOVEL_SP 0x2f00 | |
51 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 52 | |
025bb325 | 53 | /* Offset from SP to first arg on stack at first instruction of a function. */ |
103a1597 GS |
54 | #define SP_ARG0 (1 * 4) |
55 | ||
103a1597 GS |
56 | #if !defined (BPT_VECTOR) |
57 | #define BPT_VECTOR 0xf | |
58 | #endif | |
59 | ||
04180708 | 60 | constexpr gdb_byte m68k_break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
598cc9dc | 61 | |
04180708 | 62 | typedef BP_MANIPULATION (m68k_break_insn) m68k_breakpoint; |
4713453b AS |
63 | \f |
64 | ||
4713453b | 65 | /* Construct types for ISA-specific registers. */ |
209bd28e UW |
66 | static struct type * |
67 | m68k_ps_type (struct gdbarch *gdbarch) | |
4713453b | 68 | { |
209bd28e UW |
69 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
70 | ||
71 | if (!tdep->m68k_ps_type) | |
72 | { | |
73 | struct type *type; | |
74 | ||
e9bb382b | 75 | type = arch_flags_type (gdbarch, "builtin_type_m68k_ps", 4); |
209bd28e UW |
76 | append_flags_type_flag (type, 0, "C"); |
77 | append_flags_type_flag (type, 1, "V"); | |
78 | append_flags_type_flag (type, 2, "Z"); | |
79 | append_flags_type_flag (type, 3, "N"); | |
80 | append_flags_type_flag (type, 4, "X"); | |
81 | append_flags_type_flag (type, 8, "I0"); | |
82 | append_flags_type_flag (type, 9, "I1"); | |
83 | append_flags_type_flag (type, 10, "I2"); | |
84 | append_flags_type_flag (type, 12, "M"); | |
85 | append_flags_type_flag (type, 13, "S"); | |
86 | append_flags_type_flag (type, 14, "T0"); | |
87 | append_flags_type_flag (type, 15, "T1"); | |
88 | ||
89 | tdep->m68k_ps_type = type; | |
90 | } | |
91 | ||
92 | return tdep->m68k_ps_type; | |
4713453b | 93 | } |
103a1597 | 94 | |
27067745 UW |
95 | static struct type * |
96 | m68881_ext_type (struct gdbarch *gdbarch) | |
97 | { | |
98 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
99 | ||
100 | if (!tdep->m68881_ext_type) | |
101 | tdep->m68881_ext_type | |
e9bb382b | 102 | = arch_float_type (gdbarch, -1, "builtin_type_m68881_ext", |
27067745 UW |
103 | floatformats_m68881_ext); |
104 | ||
105 | return tdep->m68881_ext_type; | |
106 | } | |
107 | ||
d85fe7f7 AS |
108 | /* Return the GDB type object for the "standard" data type of data in |
109 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
110 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
111 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
112 | addresses return pointer to void, not pointer to char, because we | |
113 | don't want to attempt to print the string after printing the | |
114 | address. */ | |
5d3ed2e3 GS |
115 | |
116 | static struct type * | |
8de307e0 | 117 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 118 | { |
c984b7ff | 119 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
03dac896 | 120 | |
8ed86d01 VP |
121 | if (tdep->fpregs_present) |
122 | { | |
c984b7ff UW |
123 | if (regnum >= gdbarch_fp0_regnum (gdbarch) |
124 | && regnum <= gdbarch_fp0_regnum (gdbarch) + 7) | |
8ed86d01 VP |
125 | { |
126 | if (tdep->flavour == m68k_coldfire_flavour) | |
127 | return builtin_type (gdbarch)->builtin_double; | |
128 | else | |
27067745 | 129 | return m68881_ext_type (gdbarch); |
8ed86d01 VP |
130 | } |
131 | ||
132 | if (regnum == M68K_FPI_REGNUM) | |
0dfff4cb | 133 | return builtin_type (gdbarch)->builtin_func_ptr; |
8ed86d01 VP |
134 | |
135 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) | |
df4df182 | 136 | return builtin_type (gdbarch)->builtin_int32; |
8ed86d01 VP |
137 | } |
138 | else | |
139 | { | |
140 | if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) | |
df4df182 | 141 | return builtin_type (gdbarch)->builtin_int0; |
8ed86d01 | 142 | } |
03dac896 | 143 | |
c984b7ff | 144 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
0dfff4cb | 145 | return builtin_type (gdbarch)->builtin_func_ptr; |
03dac896 | 146 | |
32eeb91a | 147 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
0dfff4cb | 148 | return builtin_type (gdbarch)->builtin_data_ptr; |
03dac896 | 149 | |
4713453b | 150 | if (regnum == M68K_PS_REGNUM) |
209bd28e | 151 | return m68k_ps_type (gdbarch); |
4713453b | 152 | |
df4df182 | 153 | return builtin_type (gdbarch)->builtin_int32; |
5d3ed2e3 GS |
154 | } |
155 | ||
8ed86d01 | 156 | static const char *m68k_register_names[] = { |
5d3ed2e3 GS |
157 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
158 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
159 | "ps", "pc", | |
160 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
8ed86d01 | 161 | "fpcontrol", "fpstatus", "fpiaddr" |
5d3ed2e3 GS |
162 | }; |
163 | ||
8ed86d01 | 164 | /* Function: m68k_register_name |
025bb325 | 165 | Returns the name of the standard m68k register regnum. */ |
8ed86d01 VP |
166 | |
167 | static const char * | |
d93859e2 | 168 | m68k_register_name (struct gdbarch *gdbarch, int regnum) |
8ed86d01 VP |
169 | { |
170 | if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names)) | |
5d3ed2e3 | 171 | internal_error (__FILE__, __LINE__, |
025bb325 MS |
172 | _("m68k_register_name: illegal register number %d"), |
173 | regnum); | |
86443c3e MK |
174 | else if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM |
175 | && gdbarch_tdep (gdbarch)->fpregs_present == 0) | |
176 | return ""; | |
5d3ed2e3 | 177 | else |
8ed86d01 | 178 | return m68k_register_names[regnum]; |
5d3ed2e3 | 179 | } |
e47577ab MK |
180 | \f |
181 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
182 | needs any special handling. */ | |
183 | ||
184 | static int | |
025bb325 MS |
185 | m68k_convert_register_p (struct gdbarch *gdbarch, |
186 | int regnum, struct type *type) | |
e47577ab | 187 | { |
0abe36f5 | 188 | if (!gdbarch_tdep (gdbarch)->fpregs_present) |
8ed86d01 | 189 | return 0; |
83acabca | 190 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7 |
e3ec9b69 YQ |
191 | /* We only support floating-point values. */ |
192 | && TYPE_CODE (type) == TYPE_CODE_FLT | |
3c1ac6e7 | 193 | && type != register_type (gdbarch, M68K_FP0_REGNUM)); |
e47577ab MK |
194 | } |
195 | ||
196 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
197 | return its contents in TO. */ | |
198 | ||
8dccd430 | 199 | static int |
e47577ab | 200 | m68k_register_to_value (struct frame_info *frame, int regnum, |
8dccd430 PA |
201 | struct type *type, gdb_byte *to, |
202 | int *optimizedp, int *unavailablep) | |
e47577ab | 203 | { |
d8e07dda | 204 | struct gdbarch *gdbarch = get_frame_arch (frame); |
f5cf7aa1 | 205 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
e3ec9b69 | 206 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
e47577ab | 207 | |
e3ec9b69 | 208 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT); |
8dccd430 PA |
209 | |
210 | /* Convert to TYPE. */ | |
d8e07dda YQ |
211 | if (!get_frame_register_bytes (frame, regnum, 0, |
212 | register_size (gdbarch, regnum), | |
8dccd430 PA |
213 | from, optimizedp, unavailablep)) |
214 | return 0; | |
215 | ||
8ed86d01 | 216 | convert_typed_floating (from, fpreg_type, to, type); |
8dccd430 PA |
217 | *optimizedp = *unavailablep = 0; |
218 | return 1; | |
e47577ab MK |
219 | } |
220 | ||
221 | /* Write the contents FROM of a value of type TYPE into register | |
222 | REGNUM in frame FRAME. */ | |
223 | ||
224 | static void | |
225 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 226 | struct type *type, const gdb_byte *from) |
e47577ab | 227 | { |
f5cf7aa1 | 228 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
229 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
230 | M68K_FP0_REGNUM); | |
e47577ab MK |
231 | |
232 | /* We only support floating-point values. */ | |
233 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
234 | { | |
8a3fe4f8 AC |
235 | warning (_("Cannot convert non-floating-point type " |
236 | "to floating-point register value.")); | |
e47577ab MK |
237 | return; |
238 | } | |
239 | ||
83acabca | 240 | /* Convert from TYPE. */ |
8ed86d01 | 241 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
242 | put_frame_register (frame, regnum, to); |
243 | } | |
244 | ||
8de307e0 | 245 | \f |
f595cb19 MK |
246 | /* There is a fair number of calling conventions that are in somewhat |
247 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
248 | coprocessor. All function return values are stored in %d0/%d1. | |
249 | Structures are returned in a static buffer, a pointer to which is | |
250 | returned in %d0. This means that functions returning a structure | |
251 | are not re-entrant. To avoid this problem some systems use a | |
252 | convention where the caller passes a pointer to a buffer in %a1 | |
253 | where the return values is to be stored. This convention is the | |
254 | default, and is implemented in the function m68k_return_value. | |
255 | ||
256 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
257 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
258 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
259 | psABI. Integer values are returned in %d0/%d1, pointer return | |
260 | values in %a0 and floating values in %fp0. When calling functions | |
261 | returning a structure the caller should pass a pointer to a buffer | |
262 | for the return value in %a0. This convention is implemented in the | |
263 | function m68k_svr4_return_value, and by appropriately setting the | |
264 | struct_value_regnum member of `struct gdbarch_tdep'. | |
265 | ||
266 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
267 | for passing the structure return value buffer. | |
268 | ||
269 | GCC can also generate code where small structures are returned in | |
270 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
271 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
272 | embedded systems. This convention is implemented by setting the | |
273 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
274 | ||
275 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 276 | into VALBUF. */ |
942dc0e9 GS |
277 | |
278 | static void | |
8de307e0 | 279 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 280 | gdb_byte *valbuf) |
942dc0e9 | 281 | { |
8de307e0 | 282 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 283 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 284 | |
8de307e0 AS |
285 | if (len <= 4) |
286 | { | |
287 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
288 | memcpy (valbuf, buf + (4 - len), len); | |
289 | } | |
290 | else if (len <= 8) | |
291 | { | |
292 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
293 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 294 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
295 | } |
296 | else | |
297 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 298 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
299 | } |
300 | ||
942dc0e9 | 301 | static void |
f595cb19 | 302 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 303 | gdb_byte *valbuf) |
942dc0e9 | 304 | { |
f5cf7aa1 | 305 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
306 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
307 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
942dc0e9 | 308 | |
8ed86d01 | 309 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 310 | { |
c984b7ff | 311 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f595cb19 | 312 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 313 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 314 | } |
354ecfd5 | 315 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4) |
f595cb19 MK |
316 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); |
317 | else | |
318 | m68k_extract_return_value (type, regcache, valbuf); | |
319 | } | |
320 | ||
321 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
322 | ||
323 | static void | |
324 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 325 | const gdb_byte *valbuf) |
f595cb19 MK |
326 | { |
327 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 328 | |
8de307e0 AS |
329 | if (len <= 4) |
330 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
331 | else if (len <= 8) | |
332 | { | |
f595cb19 | 333 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 334 | len - 4, valbuf); |
f5cf7aa1 | 335 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
336 | } |
337 | else | |
338 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 339 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 340 | } |
942dc0e9 | 341 | |
f595cb19 MK |
342 | static void |
343 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 344 | const gdb_byte *valbuf) |
942dc0e9 | 345 | { |
c984b7ff UW |
346 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
347 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
8de307e0 | 348 | |
8ed86d01 | 349 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 350 | { |
c984b7ff | 351 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f5cf7aa1 | 352 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 353 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
354 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
355 | } | |
354ecfd5 | 356 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4) |
f595cb19 MK |
357 | { |
358 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
359 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
360 | } | |
361 | else | |
362 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
363 | } |
364 | ||
108fb0f7 AS |
365 | /* Return non-zero if TYPE, which is assumed to be a structure, union or |
366 | complex type, should be returned in registers for architecture | |
f595cb19 MK |
367 | GDBARCH. */ |
368 | ||
c481dac7 | 369 | static int |
f595cb19 | 370 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 371 | { |
f595cb19 MK |
372 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
373 | enum type_code code = TYPE_CODE (type); | |
374 | int len = TYPE_LENGTH (type); | |
c481dac7 | 375 | |
108fb0f7 AS |
376 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
377 | || code == TYPE_CODE_COMPLEX); | |
f595cb19 MK |
378 | |
379 | if (tdep->struct_return == pcc_struct_return) | |
380 | return 0; | |
381 | ||
382 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
383 | } |
384 | ||
f595cb19 MK |
385 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
386 | should be returned. If it is supposed to be returned in registers, | |
387 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
388 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
389 | from WRITEBUF into REGCACHE. */ | |
390 | ||
391 | static enum return_value_convention | |
6a3a010b | 392 | m68k_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
393 | struct type *type, struct regcache *regcache, |
394 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
395 | { |
396 | enum type_code code = TYPE_CODE (type); | |
397 | ||
1c845060 | 398 | /* GCC returns a `long double' in memory too. */ |
108fb0f7 AS |
399 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
400 | || code == TYPE_CODE_COMPLEX) | |
1c845060 MK |
401 | && !m68k_reg_struct_return_p (gdbarch, type)) |
402 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
403 | { | |
404 | /* The default on m68k is to return structures in static memory. | |
405 | Consequently a function must return the address where we can | |
406 | find the return value. */ | |
f595cb19 | 407 | |
1c845060 MK |
408 | if (readbuf) |
409 | { | |
410 | ULONGEST addr; | |
411 | ||
412 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
413 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
414 | } | |
415 | ||
416 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
417 | } | |
f595cb19 MK |
418 | |
419 | if (readbuf) | |
420 | m68k_extract_return_value (type, regcache, readbuf); | |
421 | if (writebuf) | |
422 | m68k_store_return_value (type, regcache, writebuf); | |
423 | ||
424 | return RETURN_VALUE_REGISTER_CONVENTION; | |
425 | } | |
426 | ||
427 | static enum return_value_convention | |
6a3a010b | 428 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
429 | struct type *type, struct regcache *regcache, |
430 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
431 | { |
432 | enum type_code code = TYPE_CODE (type); | |
433 | ||
108fb0f7 AS |
434 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
435 | || code == TYPE_CODE_COMPLEX) | |
f595cb19 | 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)); | |
6a3a010b | 468 | return m68k_svr4_return_value (gdbarch, function, 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); |
e17a4113 | 498 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
f5cf7aa1 | 499 | gdb_byte buf[4]; |
8de307e0 AS |
500 | int i; |
501 | ||
502 | /* Push arguments in reverse order. */ | |
503 | for (i = nargs - 1; i >= 0; i--) | |
504 | { | |
4754a64e | 505 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 506 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 507 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
508 | int offset; |
509 | ||
510 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
511 | right aligned. */ | |
512 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
513 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
514 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
515 | && len > 4) | |
516 | offset = 0; | |
517 | else | |
518 | offset = container_len - len; | |
8de307e0 | 519 | sp -= container_len; |
46615f07 | 520 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
521 | } |
522 | ||
c481dac7 | 523 | /* Store struct value address. */ |
8de307e0 AS |
524 | if (struct_return) |
525 | { | |
e17a4113 | 526 | store_unsigned_integer (buf, 4, byte_order, struct_addr); |
f595cb19 | 527 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
528 | } |
529 | ||
530 | /* Store return address. */ | |
531 | sp -= 4; | |
e17a4113 | 532 | store_unsigned_integer (buf, 4, byte_order, bp_addr); |
8de307e0 AS |
533 | write_memory (sp, buf, 4); |
534 | ||
535 | /* Finally, update the stack pointer... */ | |
e17a4113 | 536 | store_unsigned_integer (buf, 4, byte_order, sp); |
8de307e0 AS |
537 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); |
538 | ||
539 | /* ...and fake a frame pointer. */ | |
540 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
541 | ||
542 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
543 | frame's CFA. */ | |
544 | return sp + 8; | |
7f8e7424 | 545 | } |
6dd0fba6 NS |
546 | |
547 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
548 | ||
549 | static int | |
d3f73121 | 550 | m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
6dd0fba6 NS |
551 | { |
552 | if (num < 8) | |
553 | /* d0..7 */ | |
554 | return (num - 0) + M68K_D0_REGNUM; | |
555 | else if (num < 16) | |
556 | /* a0..7 */ | |
557 | return (num - 8) + M68K_A0_REGNUM; | |
d3f73121 | 558 | else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present) |
6dd0fba6 NS |
559 | /* fp0..7 */ |
560 | return (num - 16) + M68K_FP0_REGNUM; | |
561 | else if (num == 25) | |
562 | /* pc */ | |
563 | return M68K_PC_REGNUM; | |
564 | else | |
0fde2c53 | 565 | return -1; |
6dd0fba6 NS |
566 | } |
567 | ||
8de307e0 AS |
568 | \f |
569 | struct m68k_frame_cache | |
570 | { | |
571 | /* Base address. */ | |
572 | CORE_ADDR base; | |
573 | CORE_ADDR sp_offset; | |
574 | CORE_ADDR pc; | |
7f8e7424 | 575 | |
8de307e0 AS |
576 | /* Saved registers. */ |
577 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
578 | CORE_ADDR saved_sp; | |
7f8e7424 | 579 | |
8de307e0 AS |
580 | /* Stack space reserved for local variables. */ |
581 | long locals; | |
582 | }; | |
c906108c | 583 | |
8de307e0 AS |
584 | /* Allocate and initialize a frame cache. */ |
585 | ||
586 | static struct m68k_frame_cache * | |
587 | m68k_alloc_frame_cache (void) | |
c906108c | 588 | { |
8de307e0 AS |
589 | struct m68k_frame_cache *cache; |
590 | int i; | |
c906108c | 591 | |
8de307e0 | 592 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 593 | |
8de307e0 AS |
594 | /* Base address. */ |
595 | cache->base = 0; | |
596 | cache->sp_offset = -4; | |
597 | cache->pc = 0; | |
c906108c | 598 | |
8de307e0 AS |
599 | /* Saved registers. We initialize these to -1 since zero is a valid |
600 | offset (that's where %fp is supposed to be stored). */ | |
601 | for (i = 0; i < M68K_NUM_REGS; i++) | |
602 | cache->saved_regs[i] = -1; | |
603 | ||
604 | /* Frameless until proven otherwise. */ | |
605 | cache->locals = -1; | |
606 | ||
607 | return cache; | |
c906108c SS |
608 | } |
609 | ||
8de307e0 AS |
610 | /* Check whether PC points at a code that sets up a new stack frame. |
611 | If so, it updates CACHE and returns the address of the first | |
612 | instruction after the sequence that sets removes the "hidden" | |
613 | argument from the stack or CURRENT_PC, whichever is smaller. | |
614 | Otherwise, return PC. */ | |
c906108c | 615 | |
8de307e0 | 616 | static CORE_ADDR |
e17a4113 UW |
617 | m68k_analyze_frame_setup (struct gdbarch *gdbarch, |
618 | CORE_ADDR pc, CORE_ADDR current_pc, | |
8de307e0 | 619 | struct m68k_frame_cache *cache) |
c906108c | 620 | { |
e17a4113 | 621 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 AS |
622 | int op; |
623 | ||
624 | if (pc >= current_pc) | |
625 | return current_pc; | |
c906108c | 626 | |
e17a4113 | 627 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8de307e0 AS |
628 | |
629 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 630 | { |
8de307e0 AS |
631 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
632 | cache->sp_offset += 4; | |
633 | if (op == P_LINKW_FP) | |
634 | { | |
635 | /* link.w %fp, #-N */ | |
636 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
e17a4113 | 637 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
638 | |
639 | if (pc + 4 < current_pc && cache->locals == 0) | |
640 | { | |
e17a4113 | 641 | op = read_memory_unsigned_integer (pc + 4, 2, byte_order); |
8de307e0 AS |
642 | if (op == P_ADDAL_SP) |
643 | { | |
e17a4113 | 644 | cache->locals = read_memory_integer (pc + 6, 4, byte_order); |
8de307e0 AS |
645 | return pc + 10; |
646 | } | |
647 | } | |
648 | ||
649 | return pc + 4; | |
650 | } | |
651 | else if (op == P_LINKL_FP) | |
c906108c | 652 | { |
8de307e0 | 653 | /* link.l %fp, #-N */ |
e17a4113 | 654 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 AS |
655 | return pc + 6; |
656 | } | |
657 | else | |
658 | { | |
659 | /* pea (%fp); movea.l %sp, %fp */ | |
660 | cache->locals = 0; | |
661 | ||
662 | if (pc + 2 < current_pc) | |
663 | { | |
e17a4113 | 664 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
665 | |
666 | if (op == P_MOVEAL_SP_FP) | |
667 | { | |
668 | /* move.l %sp, %fp */ | |
669 | return pc + 4; | |
670 | } | |
671 | } | |
672 | ||
673 | return pc + 2; | |
c906108c SS |
674 | } |
675 | } | |
8de307e0 | 676 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 677 | { |
8de307e0 AS |
678 | /* subq.[wl] #N,%sp */ |
679 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
680 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
681 | if (pc + 2 < current_pc) | |
c906108c | 682 | { |
e17a4113 | 683 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
684 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
685 | { | |
686 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
687 | return pc + 4; | |
688 | } | |
c906108c | 689 | } |
8de307e0 AS |
690 | return pc + 2; |
691 | } | |
692 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
693 | { | |
694 | /* adda.w #-N,%sp */ | |
695 | /* lea (-N,%sp),%sp */ | |
e17a4113 | 696 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 | 697 | return pc + 4; |
c906108c | 698 | } |
8de307e0 | 699 | else if (op == P_ADDAL_SP) |
c906108c | 700 | { |
8de307e0 | 701 | /* adda.l #-N,%sp */ |
e17a4113 | 702 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 | 703 | return pc + 6; |
c906108c | 704 | } |
8de307e0 AS |
705 | |
706 | return pc; | |
c906108c | 707 | } |
c5aa993b | 708 | |
8de307e0 AS |
709 | /* Check whether PC points at code that saves registers on the stack. |
710 | If so, it updates CACHE and returns the address of the first | |
711 | instruction after the register saves or CURRENT_PC, whichever is | |
712 | smaller. Otherwise, return PC. */ | |
c906108c | 713 | |
8de307e0 | 714 | static CORE_ADDR |
be8626e0 MD |
715 | m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc, |
716 | CORE_ADDR current_pc, | |
8de307e0 AS |
717 | struct m68k_frame_cache *cache) |
718 | { | |
e17a4113 UW |
719 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
720 | ||
8de307e0 AS |
721 | if (cache->locals >= 0) |
722 | { | |
723 | CORE_ADDR offset; | |
724 | int op; | |
725 | int i, mask, regno; | |
c906108c | 726 | |
8de307e0 AS |
727 | offset = -4 - cache->locals; |
728 | while (pc < current_pc) | |
729 | { | |
e17a4113 | 730 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8ed86d01 | 731 | if (op == P_FMOVEMX_SP |
be8626e0 | 732 | && gdbarch_tdep (gdbarch)->fpregs_present) |
8de307e0 AS |
733 | { |
734 | /* fmovem.x REGS,-(%sp) */ | |
e17a4113 | 735 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
736 | if ((op & 0xff00) == 0xe000) |
737 | { | |
738 | mask = op & 0xff; | |
739 | for (i = 0; i < 16; i++, mask >>= 1) | |
740 | { | |
741 | if (mask & 1) | |
742 | { | |
743 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
744 | offset -= 12; | |
745 | } | |
746 | } | |
747 | pc += 4; | |
748 | } | |
749 | else | |
750 | break; | |
751 | } | |
0ba5a932 | 752 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
753 | { |
754 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 755 | regno = op & 017; |
8de307e0 AS |
756 | cache->saved_regs[regno] = offset; |
757 | offset -= 4; | |
758 | pc += 2; | |
759 | } | |
760 | else if (op == P_MOVEML_SP) | |
761 | { | |
762 | /* movem.l REGS,-(%sp) */ | |
e17a4113 | 763 | mask = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
764 | for (i = 0; i < 16; i++, mask >>= 1) |
765 | { | |
766 | if (mask & 1) | |
767 | { | |
768 | cache->saved_regs[15 - i] = offset; | |
769 | offset -= 4; | |
770 | } | |
771 | } | |
772 | pc += 4; | |
773 | } | |
774 | else | |
775 | break; | |
776 | } | |
777 | } | |
778 | ||
779 | return pc; | |
780 | } | |
c906108c | 781 | |
c906108c | 782 | |
8de307e0 AS |
783 | /* Do a full analysis of the prologue at PC and update CACHE |
784 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
785 | address where the analysis stopped. | |
c906108c | 786 | |
8de307e0 | 787 | We handle all cases that can be generated by gcc. |
c906108c | 788 | |
8de307e0 | 789 | For allocating a stack frame: |
c906108c | 790 | |
8de307e0 AS |
791 | link.w %a6,#-N |
792 | link.l %a6,#-N | |
793 | pea (%fp); move.l %sp,%fp | |
794 | link.w %a6,#0; add.l #-N,%sp | |
795 | subq.l #N,%sp | |
796 | subq.w #N,%sp | |
797 | subq.w #8,%sp; subq.w #N-8,%sp | |
798 | add.w #-N,%sp | |
799 | lea (-N,%sp),%sp | |
800 | add.l #-N,%sp | |
c906108c | 801 | |
8de307e0 | 802 | For saving registers: |
c906108c | 803 | |
8de307e0 AS |
804 | fmovem.x REGS,-(%sp) |
805 | move.l R1,-(%sp) | |
806 | move.l R1,-(%sp); move.l R2,-(%sp) | |
807 | movem.l REGS,-(%sp) | |
c906108c | 808 | |
8de307e0 | 809 | For setting up the PIC register: |
c906108c | 810 | |
8de307e0 | 811 | lea (%pc,N),%a5 |
c906108c | 812 | |
8de307e0 | 813 | */ |
c906108c | 814 | |
eb2e12d7 | 815 | static CORE_ADDR |
be8626e0 MD |
816 | m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
817 | CORE_ADDR current_pc, struct m68k_frame_cache *cache) | |
c906108c | 818 | { |
e17a4113 | 819 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 | 820 | unsigned int op; |
c906108c | 821 | |
e17a4113 | 822 | pc = m68k_analyze_frame_setup (gdbarch, pc, current_pc, cache); |
be8626e0 | 823 | pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache); |
8de307e0 AS |
824 | if (pc >= current_pc) |
825 | return current_pc; | |
c906108c | 826 | |
8de307e0 | 827 | /* Check for GOT setup. */ |
e17a4113 | 828 | op = read_memory_unsigned_integer (pc, 4, byte_order); |
8de307e0 | 829 | if (op == P_LEA_PC_A5) |
c906108c | 830 | { |
8de307e0 | 831 | /* lea (%pc,N),%a5 */ |
e4d8bc08 | 832 | return pc + 8; |
c906108c | 833 | } |
8de307e0 AS |
834 | |
835 | return pc; | |
c906108c SS |
836 | } |
837 | ||
8de307e0 | 838 | /* Return PC of first real instruction. */ |
7f8e7424 | 839 | |
8de307e0 | 840 | static CORE_ADDR |
6093d2eb | 841 | m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
c906108c | 842 | { |
8de307e0 AS |
843 | struct m68k_frame_cache cache; |
844 | CORE_ADDR pc; | |
c906108c | 845 | |
8de307e0 | 846 | cache.locals = -1; |
be8626e0 | 847 | pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache); |
8de307e0 AS |
848 | if (cache.locals < 0) |
849 | return start_pc; | |
850 | return pc; | |
851 | } | |
c906108c | 852 | |
8de307e0 AS |
853 | static CORE_ADDR |
854 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
855 | { | |
f5cf7aa1 | 856 | gdb_byte buf[8]; |
7f8e7424 | 857 | |
c984b7ff | 858 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
0dfff4cb | 859 | return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
8de307e0 AS |
860 | } |
861 | \f | |
862 | /* Normal frames. */ | |
7f8e7424 | 863 | |
8de307e0 | 864 | static struct m68k_frame_cache * |
f36bf22c | 865 | m68k_frame_cache (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 866 | { |
e17a4113 UW |
867 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
868 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8de307e0 | 869 | struct m68k_frame_cache *cache; |
f5cf7aa1 | 870 | gdb_byte buf[4]; |
8de307e0 AS |
871 | int i; |
872 | ||
873 | if (*this_cache) | |
9a3c8263 | 874 | return (struct m68k_frame_cache *) *this_cache; |
8de307e0 AS |
875 | |
876 | cache = m68k_alloc_frame_cache (); | |
877 | *this_cache = cache; | |
878 | ||
879 | /* In principle, for normal frames, %fp holds the frame pointer, | |
880 | which holds the base address for the current stack frame. | |
881 | However, for functions that don't need it, the frame pointer is | |
882 | optional. For these "frameless" functions the frame pointer is | |
883 | actually the frame pointer of the calling frame. Signal | |
884 | trampolines are just a special case of a "frameless" function. | |
885 | They (usually) share their frame pointer with the frame that was | |
886 | in progress when the signal occurred. */ | |
887 | ||
f36bf22c | 888 | get_frame_register (this_frame, M68K_FP_REGNUM, buf); |
e17a4113 | 889 | cache->base = extract_unsigned_integer (buf, 4, byte_order); |
8de307e0 AS |
890 | if (cache->base == 0) |
891 | return cache; | |
892 | ||
893 | /* For normal frames, %pc is stored at 4(%fp). */ | |
894 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
895 | ||
f36bf22c | 896 | cache->pc = get_frame_func (this_frame); |
8de307e0 | 897 | if (cache->pc != 0) |
f36bf22c AS |
898 | m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
899 | get_frame_pc (this_frame), cache); | |
8de307e0 AS |
900 | |
901 | if (cache->locals < 0) | |
902 | { | |
903 | /* We didn't find a valid frame, which means that CACHE->base | |
904 | currently holds the frame pointer for our calling frame. If | |
905 | we're at the start of a function, or somewhere half-way its | |
906 | prologue, the function's frame probably hasn't been fully | |
907 | setup yet. Try to reconstruct the base address for the stack | |
908 | frame by looking at the stack pointer. For truly "frameless" | |
909 | functions this might work too. */ | |
910 | ||
f36bf22c | 911 | get_frame_register (this_frame, M68K_SP_REGNUM, buf); |
e17a4113 UW |
912 | cache->base = extract_unsigned_integer (buf, 4, byte_order) |
913 | + cache->sp_offset; | |
8de307e0 | 914 | } |
7f8e7424 | 915 | |
8de307e0 AS |
916 | /* Now that we have the base address for the stack frame we can |
917 | calculate the value of %sp in the calling frame. */ | |
918 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 919 | |
8de307e0 AS |
920 | /* Adjust all the saved registers such that they contain addresses |
921 | instead of offsets. */ | |
922 | for (i = 0; i < M68K_NUM_REGS; i++) | |
923 | if (cache->saved_regs[i] != -1) | |
924 | cache->saved_regs[i] += cache->base; | |
c906108c | 925 | |
8de307e0 AS |
926 | return cache; |
927 | } | |
c906108c | 928 | |
8de307e0 | 929 | static void |
f36bf22c | 930 | m68k_frame_this_id (struct frame_info *this_frame, void **this_cache, |
8de307e0 AS |
931 | struct frame_id *this_id) |
932 | { | |
f36bf22c | 933 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
c906108c | 934 | |
8de307e0 AS |
935 | /* This marks the outermost frame. */ |
936 | if (cache->base == 0) | |
937 | return; | |
c5aa993b | 938 | |
8de307e0 AS |
939 | /* See the end of m68k_push_dummy_call. */ |
940 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
941 | } | |
c5aa993b | 942 | |
f36bf22c AS |
943 | static struct value * |
944 | m68k_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
945 | int regnum) | |
8de307e0 | 946 | { |
f36bf22c | 947 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
948 | |
949 | gdb_assert (regnum >= 0); | |
950 | ||
951 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
f36bf22c | 952 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
8de307e0 AS |
953 | |
954 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
f36bf22c AS |
955 | return frame_unwind_got_memory (this_frame, regnum, |
956 | cache->saved_regs[regnum]); | |
8de307e0 | 957 | |
f36bf22c | 958 | return frame_unwind_got_register (this_frame, regnum, regnum); |
8de307e0 AS |
959 | } |
960 | ||
961 | static const struct frame_unwind m68k_frame_unwind = | |
962 | { | |
963 | NORMAL_FRAME, | |
8fbca658 | 964 | default_frame_unwind_stop_reason, |
8de307e0 | 965 | m68k_frame_this_id, |
f36bf22c AS |
966 | m68k_frame_prev_register, |
967 | NULL, | |
968 | default_frame_sniffer | |
8de307e0 | 969 | }; |
8de307e0 | 970 | \f |
8de307e0 | 971 | static CORE_ADDR |
f36bf22c | 972 | m68k_frame_base_address (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 973 | { |
f36bf22c | 974 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
975 | |
976 | return cache->base; | |
977 | } | |
978 | ||
979 | static const struct frame_base m68k_frame_base = | |
980 | { | |
981 | &m68k_frame_unwind, | |
982 | m68k_frame_base_address, | |
983 | m68k_frame_base_address, | |
984 | m68k_frame_base_address | |
985 | }; | |
986 | ||
987 | static struct frame_id | |
f36bf22c | 988 | m68k_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
8de307e0 | 989 | { |
8de307e0 | 990 | CORE_ADDR fp; |
c906108c | 991 | |
f36bf22c | 992 | fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM); |
c906108c | 993 | |
8de307e0 | 994 | /* See the end of m68k_push_dummy_call. */ |
f36bf22c | 995 | return frame_id_build (fp + 8, get_frame_pc (this_frame)); |
8de307e0 AS |
996 | } |
997 | \f | |
c906108c | 998 | |
c906108c SS |
999 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1000 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1001 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
025bb325 | 1002 | This routine returns true on success. */ |
c906108c | 1003 | |
c34d127c | 1004 | static int |
60ade65d | 1005 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 1006 | { |
f5cf7aa1 | 1007 | gdb_byte *buf; |
c906108c | 1008 | CORE_ADDR sp, jb_addr; |
c984b7ff | 1009 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
1010 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1011 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
eb2e12d7 AS |
1012 | |
1013 | if (tdep->jb_pc < 0) | |
1014 | { | |
1015 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1016 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1017 | return 0; |
1018 | } | |
c906108c | 1019 | |
224c3ddb | 1020 | buf = (gdb_byte *) alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
c984b7ff | 1021 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); |
c906108c | 1022 | |
025bb325 | 1023 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
c984b7ff | 1024 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1025 | return 0; |
1026 | ||
c984b7ff | 1027 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1028 | / TARGET_CHAR_BIT, byte_order); |
c906108c | 1029 | |
eb2e12d7 | 1030 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
e17a4113 UW |
1031 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT), |
1032 | byte_order) | |
c906108c SS |
1033 | return 0; |
1034 | ||
c984b7ff | 1035 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1036 | / TARGET_CHAR_BIT, byte_order); |
c906108c SS |
1037 | return 1; |
1038 | } | |
f595cb19 MK |
1039 | \f |
1040 | ||
18648a37 YQ |
1041 | /* This is the implementation of gdbarch method |
1042 | return_in_first_hidden_param_p. */ | |
1043 | ||
1044 | static int | |
1045 | m68k_return_in_first_hidden_param_p (struct gdbarch *gdbarch, | |
1046 | struct type *type) | |
1047 | { | |
1048 | return 0; | |
1049 | } | |
1050 | ||
f595cb19 MK |
1051 | /* System V Release 4 (SVR4). */ |
1052 | ||
1053 | void | |
1054 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1055 | { | |
1056 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1057 | ||
1058 | /* SVR4 uses a different calling convention. */ | |
1059 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1060 | ||
1061 | /* SVR4 uses %a0 instead of %a1. */ | |
1062 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1063 | } | |
1064 | \f | |
c906108c | 1065 | |
152d9db6 GS |
1066 | /* Function: m68k_gdbarch_init |
1067 | Initializer function for the m68k gdbarch vector. | |
025bb325 | 1068 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
152d9db6 GS |
1069 | |
1070 | static struct gdbarch * | |
1071 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1072 | { | |
1073 | struct gdbarch_tdep *tdep = NULL; | |
1074 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1075 | struct gdbarch_list *best_arch; |
1076 | struct tdesc_arch_data *tdesc_data = NULL; | |
1077 | int i; | |
1078 | enum m68k_flavour flavour = m68k_no_flavour; | |
1079 | int has_fp = 1; | |
1080 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1081 | ||
1082 | /* Check any target description for validity. */ | |
1083 | if (tdesc_has_registers (info.target_desc)) | |
1084 | { | |
1085 | const struct tdesc_feature *feature; | |
1086 | int valid_p; | |
152d9db6 | 1087 | |
8ed86d01 VP |
1088 | feature = tdesc_find_feature (info.target_desc, |
1089 | "org.gnu.gdb.m68k.core"); | |
8ed86d01 VP |
1090 | |
1091 | if (feature == NULL) | |
1092 | { | |
1093 | feature = tdesc_find_feature (info.target_desc, | |
1094 | "org.gnu.gdb.coldfire.core"); | |
1095 | if (feature != NULL) | |
1096 | flavour = m68k_coldfire_flavour; | |
1097 | } | |
1098 | ||
1099 | if (feature == NULL) | |
1100 | { | |
1101 | feature = tdesc_find_feature (info.target_desc, | |
1102 | "org.gnu.gdb.fido.core"); | |
1103 | if (feature != NULL) | |
1104 | flavour = m68k_fido_flavour; | |
1105 | } | |
1106 | ||
1107 | if (feature == NULL) | |
1108 | return NULL; | |
1109 | ||
1110 | tdesc_data = tdesc_data_alloc (); | |
1111 | ||
1112 | valid_p = 1; | |
1113 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1114 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1115 | m68k_register_names[i]); | |
1116 | ||
1117 | if (!valid_p) | |
1118 | { | |
1119 | tdesc_data_cleanup (tdesc_data); | |
1120 | return NULL; | |
1121 | } | |
1122 | ||
1123 | feature = tdesc_find_feature (info.target_desc, | |
1124 | "org.gnu.gdb.coldfire.fp"); | |
1125 | if (feature != NULL) | |
1126 | { | |
1127 | valid_p = 1; | |
1128 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1129 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1130 | m68k_register_names[i]); | |
1131 | if (!valid_p) | |
1132 | { | |
1133 | tdesc_data_cleanup (tdesc_data); | |
1134 | return NULL; | |
1135 | } | |
1136 | } | |
1137 | else | |
1138 | has_fp = 0; | |
1139 | } | |
1140 | ||
1141 | /* The mechanism for returning floating values from function | |
1142 | and the type of long double depend on whether we're | |
025bb325 | 1143 | on ColdFire or standard m68k. */ |
8ed86d01 | 1144 | |
4ed77933 | 1145 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1146 | { |
1147 | const bfd_arch_info_type *coldfire_arch = | |
1148 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1149 | ||
1150 | if (coldfire_arch | |
4ed77933 AS |
1151 | && ((*info.bfd_arch_info->compatible) |
1152 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1153 | flavour = m68k_coldfire_flavour; |
1154 | } | |
1155 | ||
1156 | /* If there is already a candidate, use it. */ | |
1157 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1158 | best_arch != NULL; | |
1159 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1160 | { | |
1161 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1162 | continue; | |
1163 | ||
1164 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1165 | continue; | |
1166 | ||
1167 | break; | |
1168 | } | |
152d9db6 | 1169 | |
0c85e18e MK |
1170 | if (best_arch != NULL) |
1171 | { | |
1172 | if (tdesc_data != NULL) | |
1173 | tdesc_data_cleanup (tdesc_data); | |
1174 | return best_arch->gdbarch; | |
1175 | } | |
1176 | ||
8d749320 | 1177 | tdep = XCNEW (struct gdbarch_tdep); |
eb2e12d7 | 1178 | gdbarch = gdbarch_alloc (&info, tdep); |
8ed86d01 VP |
1179 | tdep->fpregs_present = has_fp; |
1180 | tdep->flavour = flavour; | |
152d9db6 | 1181 | |
8ed86d01 VP |
1182 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1183 | long_double_format = floatformats_ieee_double; | |
1184 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1185 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1186 | |
5d3ed2e3 | 1187 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
04180708 YQ |
1188 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, m68k_breakpoint::kind_from_pc); |
1189 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, m68k_breakpoint::bp_from_kind); | |
5d3ed2e3 | 1190 | |
025bb325 | 1191 | /* Stack grows down. */ |
5d3ed2e3 | 1192 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
9bb47d95 | 1193 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1194 | |
1195 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1196 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1197 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1198 | |
6300c360 | 1199 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 | 1200 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
942dc0e9 | 1201 | |
8de307e0 | 1202 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1203 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1204 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1205 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1206 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1207 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
e47577ab MK |
1208 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1209 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1210 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1211 | |
8ed86d01 VP |
1212 | if (has_fp) |
1213 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1214 | ||
1215 | /* Try to figure out if the arch uses floating registers to return | |
1216 | floating point values from functions. */ | |
1217 | if (has_fp) | |
1218 | { | |
1219 | /* On ColdFire, floating point values are returned in D0. */ | |
1220 | if (flavour == m68k_coldfire_flavour) | |
1221 | tdep->float_return = 0; | |
1222 | else | |
1223 | tdep->float_return = 1; | |
1224 | } | |
1225 | else | |
1226 | { | |
1227 | /* No floating registers, so can't use them for returning values. */ | |
1228 | tdep->float_return = 0; | |
1229 | } | |
1230 | ||
025bb325 | 1231 | /* Function call & return. */ |
8de307e0 | 1232 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1233 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
18648a37 YQ |
1234 | set_gdbarch_return_in_first_hidden_param_p (gdbarch, |
1235 | m68k_return_in_first_hidden_param_p); | |
6c0e89ed | 1236 | |
eb2e12d7 AS |
1237 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1238 | tdep->jb_pc = JB_PC; | |
1239 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1240 | #else | |
1241 | tdep->jb_pc = -1; | |
1242 | #endif | |
f595cb19 | 1243 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1244 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1245 | |
1246 | /* Frame unwinder. */ | |
f36bf22c | 1247 | set_gdbarch_dummy_id (gdbarch, m68k_dummy_id); |
8de307e0 | 1248 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
3f244638 AS |
1249 | |
1250 | /* Hook in the DWARF CFI frame unwinder. */ | |
f36bf22c | 1251 | dwarf2_append_unwinders (gdbarch); |
3f244638 | 1252 | |
8de307e0 | 1253 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1254 | |
55809acb AS |
1255 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1256 | gdbarch_init_osabi (info, gdbarch); | |
1257 | ||
eb2e12d7 AS |
1258 | /* Now we have tuned the configuration, set a few final things, |
1259 | based on what the OS ABI has told us. */ | |
1260 | ||
1261 | if (tdep->jb_pc >= 0) | |
1262 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1263 | ||
f36bf22c | 1264 | frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind); |
8de307e0 | 1265 | |
8ed86d01 | 1266 | if (tdesc_data) |
7cc46491 | 1267 | tdesc_use_registers (gdbarch, info.target_desc, tdesc_data); |
8ed86d01 | 1268 | |
152d9db6 GS |
1269 | return gdbarch; |
1270 | } | |
1271 | ||
1272 | ||
1273 | static void | |
c984b7ff | 1274 | m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
152d9db6 | 1275 | { |
c984b7ff | 1276 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
152d9db6 | 1277 | |
eb2e12d7 AS |
1278 | if (tdep == NULL) |
1279 | return; | |
152d9db6 | 1280 | } |
2acceee2 | 1281 | |
a78f21af AC |
1282 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1283 | ||
c906108c | 1284 | void |
fba45db2 | 1285 | _initialize_m68k_tdep (void) |
c906108c | 1286 | { |
152d9db6 | 1287 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1288 | } |