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748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b | 2 | |
e2882c85 | 3 | Copyright (C) 1990-2018 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" |
1841ee5d | 35 | #include "floatformat.h" |
3b2ca824 | 36 | #include "target-float.h" |
32eeb91a AS |
37 | |
38 | #include "m68k-tdep.h" | |
c906108c | 39 | \f |
c5aa993b | 40 | |
89c3b6d3 PDM |
41 | #define P_LINKL_FP 0x480e |
42 | #define P_LINKW_FP 0x4e56 | |
43 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
44 | #define P_MOVEAL_SP_FP 0x2c4f |
45 | #define P_ADDAW_SP 0xdefc | |
46 | #define P_ADDAL_SP 0xdffc | |
47 | #define P_SUBQW_SP 0x514f | |
48 | #define P_SUBQL_SP 0x518f | |
49 | #define P_LEA_SP_SP 0x4fef | |
50 | #define P_LEA_PC_A5 0x4bfb0170 | |
51 | #define P_FMOVEMX_SP 0xf227 | |
52 | #define P_MOVEL_SP 0x2f00 | |
53 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 54 | |
025bb325 | 55 | /* Offset from SP to first arg on stack at first instruction of a function. */ |
103a1597 GS |
56 | #define SP_ARG0 (1 * 4) |
57 | ||
103a1597 GS |
58 | #if !defined (BPT_VECTOR) |
59 | #define BPT_VECTOR 0xf | |
60 | #endif | |
61 | ||
04180708 | 62 | constexpr gdb_byte m68k_break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
598cc9dc | 63 | |
04180708 | 64 | typedef BP_MANIPULATION (m68k_break_insn) m68k_breakpoint; |
4713453b AS |
65 | \f |
66 | ||
4713453b | 67 | /* Construct types for ISA-specific registers. */ |
209bd28e UW |
68 | static struct type * |
69 | m68k_ps_type (struct gdbarch *gdbarch) | |
4713453b | 70 | { |
209bd28e UW |
71 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
72 | ||
73 | if (!tdep->m68k_ps_type) | |
74 | { | |
75 | struct type *type; | |
76 | ||
77b7c781 | 77 | type = arch_flags_type (gdbarch, "builtin_type_m68k_ps", 32); |
209bd28e UW |
78 | append_flags_type_flag (type, 0, "C"); |
79 | append_flags_type_flag (type, 1, "V"); | |
80 | append_flags_type_flag (type, 2, "Z"); | |
81 | append_flags_type_flag (type, 3, "N"); | |
82 | append_flags_type_flag (type, 4, "X"); | |
83 | append_flags_type_flag (type, 8, "I0"); | |
84 | append_flags_type_flag (type, 9, "I1"); | |
85 | append_flags_type_flag (type, 10, "I2"); | |
86 | append_flags_type_flag (type, 12, "M"); | |
87 | append_flags_type_flag (type, 13, "S"); | |
88 | append_flags_type_flag (type, 14, "T0"); | |
89 | append_flags_type_flag (type, 15, "T1"); | |
90 | ||
91 | tdep->m68k_ps_type = type; | |
92 | } | |
93 | ||
94 | return tdep->m68k_ps_type; | |
4713453b | 95 | } |
103a1597 | 96 | |
27067745 UW |
97 | static struct type * |
98 | m68881_ext_type (struct gdbarch *gdbarch) | |
99 | { | |
100 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
101 | ||
102 | if (!tdep->m68881_ext_type) | |
103 | tdep->m68881_ext_type | |
e9bb382b | 104 | = arch_float_type (gdbarch, -1, "builtin_type_m68881_ext", |
27067745 UW |
105 | floatformats_m68881_ext); |
106 | ||
107 | return tdep->m68881_ext_type; | |
108 | } | |
109 | ||
d85fe7f7 AS |
110 | /* Return the GDB type object for the "standard" data type of data in |
111 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
112 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
113 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
114 | addresses return pointer to void, not pointer to char, because we | |
115 | don't want to attempt to print the string after printing the | |
116 | address. */ | |
5d3ed2e3 GS |
117 | |
118 | static struct type * | |
8de307e0 | 119 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 120 | { |
c984b7ff | 121 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
03dac896 | 122 | |
8ed86d01 VP |
123 | if (tdep->fpregs_present) |
124 | { | |
c984b7ff UW |
125 | if (regnum >= gdbarch_fp0_regnum (gdbarch) |
126 | && regnum <= gdbarch_fp0_regnum (gdbarch) + 7) | |
8ed86d01 VP |
127 | { |
128 | if (tdep->flavour == m68k_coldfire_flavour) | |
129 | return builtin_type (gdbarch)->builtin_double; | |
130 | else | |
27067745 | 131 | return m68881_ext_type (gdbarch); |
8ed86d01 VP |
132 | } |
133 | ||
134 | if (regnum == M68K_FPI_REGNUM) | |
0dfff4cb | 135 | return builtin_type (gdbarch)->builtin_func_ptr; |
8ed86d01 VP |
136 | |
137 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM) | |
df4df182 | 138 | return builtin_type (gdbarch)->builtin_int32; |
8ed86d01 VP |
139 | } |
140 | else | |
141 | { | |
142 | if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM) | |
df4df182 | 143 | return builtin_type (gdbarch)->builtin_int0; |
8ed86d01 | 144 | } |
03dac896 | 145 | |
c984b7ff | 146 | if (regnum == gdbarch_pc_regnum (gdbarch)) |
0dfff4cb | 147 | return builtin_type (gdbarch)->builtin_func_ptr; |
03dac896 | 148 | |
32eeb91a | 149 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
0dfff4cb | 150 | return builtin_type (gdbarch)->builtin_data_ptr; |
03dac896 | 151 | |
4713453b | 152 | if (regnum == M68K_PS_REGNUM) |
209bd28e | 153 | return m68k_ps_type (gdbarch); |
4713453b | 154 | |
df4df182 | 155 | return builtin_type (gdbarch)->builtin_int32; |
5d3ed2e3 GS |
156 | } |
157 | ||
8ed86d01 | 158 | static const char *m68k_register_names[] = { |
5d3ed2e3 GS |
159 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", |
160 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
161 | "ps", "pc", | |
162 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
8ed86d01 | 163 | "fpcontrol", "fpstatus", "fpiaddr" |
5d3ed2e3 GS |
164 | }; |
165 | ||
8ed86d01 | 166 | /* Function: m68k_register_name |
025bb325 | 167 | Returns the name of the standard m68k register regnum. */ |
8ed86d01 VP |
168 | |
169 | static const char * | |
d93859e2 | 170 | m68k_register_name (struct gdbarch *gdbarch, int regnum) |
8ed86d01 VP |
171 | { |
172 | if (regnum < 0 || regnum >= ARRAY_SIZE (m68k_register_names)) | |
5d3ed2e3 | 173 | internal_error (__FILE__, __LINE__, |
025bb325 MS |
174 | _("m68k_register_name: illegal register number %d"), |
175 | regnum); | |
86443c3e MK |
176 | else if (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM |
177 | && gdbarch_tdep (gdbarch)->fpregs_present == 0) | |
178 | return ""; | |
5d3ed2e3 | 179 | else |
8ed86d01 | 180 | return m68k_register_names[regnum]; |
5d3ed2e3 | 181 | } |
e47577ab MK |
182 | \f |
183 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
184 | needs any special handling. */ | |
185 | ||
186 | static int | |
025bb325 MS |
187 | m68k_convert_register_p (struct gdbarch *gdbarch, |
188 | int regnum, struct type *type) | |
e47577ab | 189 | { |
0abe36f5 | 190 | if (!gdbarch_tdep (gdbarch)->fpregs_present) |
8ed86d01 | 191 | return 0; |
83acabca | 192 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7 |
e3ec9b69 YQ |
193 | /* We only support floating-point values. */ |
194 | && TYPE_CODE (type) == TYPE_CODE_FLT | |
3c1ac6e7 | 195 | && type != register_type (gdbarch, M68K_FP0_REGNUM)); |
e47577ab MK |
196 | } |
197 | ||
198 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
199 | return its contents in TO. */ | |
200 | ||
8dccd430 | 201 | static int |
e47577ab | 202 | m68k_register_to_value (struct frame_info *frame, int regnum, |
8dccd430 PA |
203 | struct type *type, gdb_byte *to, |
204 | int *optimizedp, int *unavailablep) | |
e47577ab | 205 | { |
d8e07dda | 206 | struct gdbarch *gdbarch = get_frame_arch (frame); |
f5cf7aa1 | 207 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
e3ec9b69 | 208 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
e47577ab | 209 | |
e3ec9b69 | 210 | gdb_assert (TYPE_CODE (type) == TYPE_CODE_FLT); |
8dccd430 PA |
211 | |
212 | /* Convert to TYPE. */ | |
d8e07dda YQ |
213 | if (!get_frame_register_bytes (frame, regnum, 0, |
214 | register_size (gdbarch, regnum), | |
8dccd430 PA |
215 | from, optimizedp, unavailablep)) |
216 | return 0; | |
217 | ||
3b2ca824 | 218 | target_float_convert (from, fpreg_type, to, type); |
8dccd430 PA |
219 | *optimizedp = *unavailablep = 0; |
220 | return 1; | |
e47577ab MK |
221 | } |
222 | ||
223 | /* Write the contents FROM of a value of type TYPE into register | |
224 | REGNUM in frame FRAME. */ | |
225 | ||
226 | static void | |
227 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 228 | struct type *type, const gdb_byte *from) |
e47577ab | 229 | { |
f5cf7aa1 | 230 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
231 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
232 | M68K_FP0_REGNUM); | |
e47577ab MK |
233 | |
234 | /* We only support floating-point values. */ | |
235 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
236 | { | |
8a3fe4f8 AC |
237 | warning (_("Cannot convert non-floating-point type " |
238 | "to floating-point register value.")); | |
e47577ab MK |
239 | return; |
240 | } | |
241 | ||
83acabca | 242 | /* Convert from TYPE. */ |
3b2ca824 | 243 | target_float_convert (from, type, to, fpreg_type); |
e47577ab MK |
244 | put_frame_register (frame, regnum, to); |
245 | } | |
246 | ||
8de307e0 | 247 | \f |
f595cb19 MK |
248 | /* There is a fair number of calling conventions that are in somewhat |
249 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
250 | coprocessor. All function return values are stored in %d0/%d1. | |
251 | Structures are returned in a static buffer, a pointer to which is | |
252 | returned in %d0. This means that functions returning a structure | |
253 | are not re-entrant. To avoid this problem some systems use a | |
254 | convention where the caller passes a pointer to a buffer in %a1 | |
255 | where the return values is to be stored. This convention is the | |
256 | default, and is implemented in the function m68k_return_value. | |
257 | ||
258 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
259 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
260 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
261 | psABI. Integer values are returned in %d0/%d1, pointer return | |
262 | values in %a0 and floating values in %fp0. When calling functions | |
263 | returning a structure the caller should pass a pointer to a buffer | |
264 | for the return value in %a0. This convention is implemented in the | |
265 | function m68k_svr4_return_value, and by appropriately setting the | |
266 | struct_value_regnum member of `struct gdbarch_tdep'. | |
267 | ||
268 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
269 | for passing the structure return value buffer. | |
270 | ||
271 | GCC can also generate code where small structures are returned in | |
272 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
273 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
274 | embedded systems. This convention is implemented by setting the | |
275 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
276 | ||
277 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 278 | into VALBUF. */ |
942dc0e9 GS |
279 | |
280 | static void | |
8de307e0 | 281 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 282 | gdb_byte *valbuf) |
942dc0e9 | 283 | { |
8de307e0 | 284 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 285 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 286 | |
8de307e0 AS |
287 | if (len <= 4) |
288 | { | |
0b883586 | 289 | regcache->raw_read (M68K_D0_REGNUM, buf); |
8de307e0 AS |
290 | memcpy (valbuf, buf + (4 - len), len); |
291 | } | |
292 | else if (len <= 8) | |
293 | { | |
0b883586 | 294 | regcache->raw_read (M68K_D0_REGNUM, buf); |
8de307e0 | 295 | memcpy (valbuf, buf + (8 - len), len - 4); |
0b883586 | 296 | regcache->raw_read (M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
297 | } |
298 | else | |
299 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 300 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
301 | } |
302 | ||
942dc0e9 | 303 | static void |
f595cb19 | 304 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 305 | gdb_byte *valbuf) |
942dc0e9 | 306 | { |
f5cf7aa1 | 307 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
ac7936df | 308 | struct gdbarch *gdbarch = regcache->arch (); |
c984b7ff | 309 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
942dc0e9 | 310 | |
8ed86d01 | 311 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 312 | { |
c984b7ff | 313 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
0b883586 | 314 | regcache->raw_read (M68K_FP0_REGNUM, buf); |
3b2ca824 | 315 | target_float_convert (buf, fpreg_type, valbuf, type); |
8de307e0 | 316 | } |
354ecfd5 | 317 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4) |
0b883586 | 318 | regcache->raw_read (M68K_A0_REGNUM, valbuf); |
f595cb19 MK |
319 | else |
320 | m68k_extract_return_value (type, regcache, valbuf); | |
321 | } | |
322 | ||
323 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
324 | ||
325 | static void | |
326 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 327 | const gdb_byte *valbuf) |
f595cb19 MK |
328 | { |
329 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 330 | |
8de307e0 | 331 | if (len <= 4) |
4f0420fd | 332 | regcache->raw_write_part (M68K_D0_REGNUM, 4 - len, len, valbuf); |
8de307e0 AS |
333 | else if (len <= 8) |
334 | { | |
4f0420fd | 335 | regcache->raw_write_part (M68K_D0_REGNUM, 8 - len, len - 4, valbuf); |
10eaee5f | 336 | regcache->raw_write (M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
337 | } |
338 | else | |
339 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 340 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 341 | } |
942dc0e9 | 342 | |
f595cb19 MK |
343 | static void |
344 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 345 | const gdb_byte *valbuf) |
942dc0e9 | 346 | { |
ac7936df | 347 | struct gdbarch *gdbarch = regcache->arch (); |
c984b7ff | 348 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
8de307e0 | 349 | |
8ed86d01 | 350 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 351 | { |
c984b7ff | 352 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f5cf7aa1 | 353 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
3b2ca824 | 354 | target_float_convert (valbuf, type, buf, fpreg_type); |
10eaee5f | 355 | regcache->raw_write (M68K_FP0_REGNUM, buf); |
f595cb19 | 356 | } |
354ecfd5 | 357 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4) |
f595cb19 | 358 | { |
10eaee5f SM |
359 | regcache->raw_write (M68K_A0_REGNUM, valbuf); |
360 | regcache->raw_write (M68K_D0_REGNUM, valbuf); | |
f595cb19 MK |
361 | } |
362 | else | |
363 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
364 | } |
365 | ||
108fb0f7 AS |
366 | /* Return non-zero if TYPE, which is assumed to be a structure, union or |
367 | complex type, should be returned in registers for architecture | |
f595cb19 MK |
368 | GDBARCH. */ |
369 | ||
c481dac7 | 370 | static int |
f595cb19 | 371 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 372 | { |
f595cb19 MK |
373 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
374 | enum type_code code = TYPE_CODE (type); | |
375 | int len = TYPE_LENGTH (type); | |
c481dac7 | 376 | |
108fb0f7 AS |
377 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
378 | || code == TYPE_CODE_COMPLEX); | |
f595cb19 MK |
379 | |
380 | if (tdep->struct_return == pcc_struct_return) | |
381 | return 0; | |
382 | ||
383 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
384 | } |
385 | ||
f595cb19 MK |
386 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
387 | should be returned. If it is supposed to be returned in registers, | |
388 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
389 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
390 | from WRITEBUF into REGCACHE. */ | |
391 | ||
392 | static enum return_value_convention | |
6a3a010b | 393 | m68k_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
394 | struct type *type, struct regcache *regcache, |
395 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
396 | { |
397 | enum type_code code = TYPE_CODE (type); | |
398 | ||
1c845060 | 399 | /* GCC returns a `long double' in memory too. */ |
108fb0f7 AS |
400 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
401 | || code == TYPE_CODE_COMPLEX) | |
1c845060 MK |
402 | && !m68k_reg_struct_return_p (gdbarch, type)) |
403 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
404 | { | |
405 | /* The default on m68k is to return structures in static memory. | |
406 | Consequently a function must return the address where we can | |
407 | find the return value. */ | |
f595cb19 | 408 | |
1c845060 MK |
409 | if (readbuf) |
410 | { | |
411 | ULONGEST addr; | |
412 | ||
413 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
414 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
415 | } | |
416 | ||
417 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
418 | } | |
f595cb19 MK |
419 | |
420 | if (readbuf) | |
421 | m68k_extract_return_value (type, regcache, readbuf); | |
422 | if (writebuf) | |
423 | m68k_store_return_value (type, regcache, writebuf); | |
424 | ||
425 | return RETURN_VALUE_REGISTER_CONVENTION; | |
426 | } | |
427 | ||
428 | static enum return_value_convention | |
6a3a010b | 429 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
430 | struct type *type, struct regcache *regcache, |
431 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
432 | { |
433 | enum type_code code = TYPE_CODE (type); | |
434 | ||
108fb0f7 AS |
435 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
436 | || code == TYPE_CODE_COMPLEX) | |
f595cb19 | 437 | && !m68k_reg_struct_return_p (gdbarch, type)) |
51da707a MK |
438 | { |
439 | /* The System V ABI says that: | |
440 | ||
441 | "A function returning a structure or union also sets %a0 to | |
442 | the value it finds in %a0. Thus when the caller receives | |
443 | control again, the address of the returned object resides in | |
444 | register %a0." | |
445 | ||
446 | So the ABI guarantees that we can always find the return | |
447 | value just after the function has returned. */ | |
448 | ||
449 | if (readbuf) | |
450 | { | |
451 | ULONGEST addr; | |
452 | ||
453 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
454 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
455 | } | |
456 | ||
457 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
458 | } | |
f595cb19 MK |
459 | |
460 | /* This special case is for structures consisting of a single | |
461 | `float' or `double' member. These structures are returned in | |
462 | %fp0. For these structures, we call ourselves recursively, | |
463 | changing TYPE into the type of the first member of the structure. | |
464 | Since that should work for all structures that have only one | |
465 | member, we don't bother to check the member's type here. */ | |
466 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
467 | { | |
468 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
6a3a010b | 469 | return m68k_svr4_return_value (gdbarch, function, type, regcache, |
f595cb19 MK |
470 | readbuf, writebuf); |
471 | } | |
472 | ||
473 | if (readbuf) | |
474 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
475 | if (writebuf) | |
476 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
477 | ||
478 | return RETURN_VALUE_REGISTER_CONVENTION; | |
479 | } | |
480 | \f | |
392a587b | 481 | |
9bb47d95 NS |
482 | /* Always align the frame to a 4-byte boundary. This is required on |
483 | coldfire and harmless on the rest. */ | |
484 | ||
485 | static CORE_ADDR | |
486 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
487 | { | |
488 | /* Align the stack to four bytes. */ | |
489 | return sp & ~3; | |
490 | } | |
491 | ||
8de307e0 | 492 | static CORE_ADDR |
7d9b040b | 493 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
494 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
495 | struct value **args, CORE_ADDR sp, int struct_return, | |
496 | CORE_ADDR struct_addr) | |
7f8e7424 | 497 | { |
f595cb19 | 498 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 499 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
f5cf7aa1 | 500 | gdb_byte buf[4]; |
8de307e0 AS |
501 | int i; |
502 | ||
503 | /* Push arguments in reverse order. */ | |
504 | for (i = nargs - 1; i >= 0; i--) | |
505 | { | |
4754a64e | 506 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 507 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 508 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
509 | int offset; |
510 | ||
511 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
512 | right aligned. */ | |
513 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
514 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
515 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
516 | && len > 4) | |
517 | offset = 0; | |
518 | else | |
519 | offset = container_len - len; | |
8de307e0 | 520 | sp -= container_len; |
46615f07 | 521 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
522 | } |
523 | ||
c481dac7 | 524 | /* Store struct value address. */ |
8de307e0 AS |
525 | if (struct_return) |
526 | { | |
e17a4113 | 527 | store_unsigned_integer (buf, 4, byte_order, struct_addr); |
b66f5587 | 528 | regcache->cooked_write (tdep->struct_value_regnum, buf); |
8de307e0 AS |
529 | } |
530 | ||
531 | /* Store return address. */ | |
532 | sp -= 4; | |
e17a4113 | 533 | store_unsigned_integer (buf, 4, byte_order, bp_addr); |
8de307e0 AS |
534 | write_memory (sp, buf, 4); |
535 | ||
536 | /* Finally, update the stack pointer... */ | |
e17a4113 | 537 | store_unsigned_integer (buf, 4, byte_order, sp); |
b66f5587 | 538 | regcache->cooked_write (M68K_SP_REGNUM, buf); |
8de307e0 AS |
539 | |
540 | /* ...and fake a frame pointer. */ | |
b66f5587 | 541 | regcache->cooked_write (M68K_FP_REGNUM, buf); |
8de307e0 AS |
542 | |
543 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
544 | frame's CFA. */ | |
545 | return sp + 8; | |
7f8e7424 | 546 | } |
6dd0fba6 NS |
547 | |
548 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
549 | ||
550 | static int | |
d3f73121 | 551 | m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
6dd0fba6 NS |
552 | { |
553 | if (num < 8) | |
554 | /* d0..7 */ | |
555 | return (num - 0) + M68K_D0_REGNUM; | |
556 | else if (num < 16) | |
557 | /* a0..7 */ | |
558 | return (num - 8) + M68K_A0_REGNUM; | |
d3f73121 | 559 | else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present) |
6dd0fba6 NS |
560 | /* fp0..7 */ |
561 | return (num - 16) + M68K_FP0_REGNUM; | |
562 | else if (num == 25) | |
563 | /* pc */ | |
564 | return M68K_PC_REGNUM; | |
565 | else | |
0fde2c53 | 566 | return -1; |
6dd0fba6 NS |
567 | } |
568 | ||
8de307e0 AS |
569 | \f |
570 | struct m68k_frame_cache | |
571 | { | |
572 | /* Base address. */ | |
573 | CORE_ADDR base; | |
574 | CORE_ADDR sp_offset; | |
575 | CORE_ADDR pc; | |
7f8e7424 | 576 | |
8de307e0 AS |
577 | /* Saved registers. */ |
578 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
579 | CORE_ADDR saved_sp; | |
7f8e7424 | 580 | |
8de307e0 AS |
581 | /* Stack space reserved for local variables. */ |
582 | long locals; | |
583 | }; | |
c906108c | 584 | |
8de307e0 AS |
585 | /* Allocate and initialize a frame cache. */ |
586 | ||
587 | static struct m68k_frame_cache * | |
588 | m68k_alloc_frame_cache (void) | |
c906108c | 589 | { |
8de307e0 AS |
590 | struct m68k_frame_cache *cache; |
591 | int i; | |
c906108c | 592 | |
8de307e0 | 593 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 594 | |
8de307e0 AS |
595 | /* Base address. */ |
596 | cache->base = 0; | |
597 | cache->sp_offset = -4; | |
598 | cache->pc = 0; | |
c906108c | 599 | |
8de307e0 AS |
600 | /* Saved registers. We initialize these to -1 since zero is a valid |
601 | offset (that's where %fp is supposed to be stored). */ | |
602 | for (i = 0; i < M68K_NUM_REGS; i++) | |
603 | cache->saved_regs[i] = -1; | |
604 | ||
605 | /* Frameless until proven otherwise. */ | |
606 | cache->locals = -1; | |
607 | ||
608 | return cache; | |
c906108c SS |
609 | } |
610 | ||
8de307e0 AS |
611 | /* Check whether PC points at a code that sets up a new stack frame. |
612 | If so, it updates CACHE and returns the address of the first | |
613 | instruction after the sequence that sets removes the "hidden" | |
614 | argument from the stack or CURRENT_PC, whichever is smaller. | |
615 | Otherwise, return PC. */ | |
c906108c | 616 | |
8de307e0 | 617 | static CORE_ADDR |
e17a4113 UW |
618 | m68k_analyze_frame_setup (struct gdbarch *gdbarch, |
619 | CORE_ADDR pc, CORE_ADDR current_pc, | |
8de307e0 | 620 | struct m68k_frame_cache *cache) |
c906108c | 621 | { |
e17a4113 | 622 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 AS |
623 | int op; |
624 | ||
625 | if (pc >= current_pc) | |
626 | return current_pc; | |
c906108c | 627 | |
e17a4113 | 628 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8de307e0 AS |
629 | |
630 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 631 | { |
8de307e0 AS |
632 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
633 | cache->sp_offset += 4; | |
634 | if (op == P_LINKW_FP) | |
635 | { | |
636 | /* link.w %fp, #-N */ | |
637 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
e17a4113 | 638 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
639 | |
640 | if (pc + 4 < current_pc && cache->locals == 0) | |
641 | { | |
e17a4113 | 642 | op = read_memory_unsigned_integer (pc + 4, 2, byte_order); |
8de307e0 AS |
643 | if (op == P_ADDAL_SP) |
644 | { | |
e17a4113 | 645 | cache->locals = read_memory_integer (pc + 6, 4, byte_order); |
8de307e0 AS |
646 | return pc + 10; |
647 | } | |
648 | } | |
649 | ||
650 | return pc + 4; | |
651 | } | |
652 | else if (op == P_LINKL_FP) | |
c906108c | 653 | { |
8de307e0 | 654 | /* link.l %fp, #-N */ |
e17a4113 | 655 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 AS |
656 | return pc + 6; |
657 | } | |
658 | else | |
659 | { | |
660 | /* pea (%fp); movea.l %sp, %fp */ | |
661 | cache->locals = 0; | |
662 | ||
663 | if (pc + 2 < current_pc) | |
664 | { | |
e17a4113 | 665 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
666 | |
667 | if (op == P_MOVEAL_SP_FP) | |
668 | { | |
669 | /* move.l %sp, %fp */ | |
670 | return pc + 4; | |
671 | } | |
672 | } | |
673 | ||
674 | return pc + 2; | |
c906108c SS |
675 | } |
676 | } | |
8de307e0 | 677 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 678 | { |
8de307e0 AS |
679 | /* subq.[wl] #N,%sp */ |
680 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
681 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
682 | if (pc + 2 < current_pc) | |
c906108c | 683 | { |
e17a4113 | 684 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
685 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
686 | { | |
687 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
688 | return pc + 4; | |
689 | } | |
c906108c | 690 | } |
8de307e0 AS |
691 | return pc + 2; |
692 | } | |
693 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
694 | { | |
695 | /* adda.w #-N,%sp */ | |
696 | /* lea (-N,%sp),%sp */ | |
e17a4113 | 697 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 | 698 | return pc + 4; |
c906108c | 699 | } |
8de307e0 | 700 | else if (op == P_ADDAL_SP) |
c906108c | 701 | { |
8de307e0 | 702 | /* adda.l #-N,%sp */ |
e17a4113 | 703 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 | 704 | return pc + 6; |
c906108c | 705 | } |
8de307e0 AS |
706 | |
707 | return pc; | |
c906108c | 708 | } |
c5aa993b | 709 | |
8de307e0 AS |
710 | /* Check whether PC points at code that saves registers on the stack. |
711 | If so, it updates CACHE and returns the address of the first | |
712 | instruction after the register saves or CURRENT_PC, whichever is | |
713 | smaller. Otherwise, return PC. */ | |
c906108c | 714 | |
8de307e0 | 715 | static CORE_ADDR |
be8626e0 MD |
716 | m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc, |
717 | CORE_ADDR current_pc, | |
8de307e0 AS |
718 | struct m68k_frame_cache *cache) |
719 | { | |
e17a4113 UW |
720 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
721 | ||
8de307e0 AS |
722 | if (cache->locals >= 0) |
723 | { | |
724 | CORE_ADDR offset; | |
725 | int op; | |
726 | int i, mask, regno; | |
c906108c | 727 | |
8de307e0 AS |
728 | offset = -4 - cache->locals; |
729 | while (pc < current_pc) | |
730 | { | |
e17a4113 | 731 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8ed86d01 | 732 | if (op == P_FMOVEMX_SP |
be8626e0 | 733 | && gdbarch_tdep (gdbarch)->fpregs_present) |
8de307e0 AS |
734 | { |
735 | /* fmovem.x REGS,-(%sp) */ | |
e17a4113 | 736 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
737 | if ((op & 0xff00) == 0xe000) |
738 | { | |
739 | mask = op & 0xff; | |
740 | for (i = 0; i < 16; i++, mask >>= 1) | |
741 | { | |
742 | if (mask & 1) | |
743 | { | |
744 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
745 | offset -= 12; | |
746 | } | |
747 | } | |
748 | pc += 4; | |
749 | } | |
750 | else | |
751 | break; | |
752 | } | |
0ba5a932 | 753 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
754 | { |
755 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 756 | regno = op & 017; |
8de307e0 AS |
757 | cache->saved_regs[regno] = offset; |
758 | offset -= 4; | |
759 | pc += 2; | |
760 | } | |
761 | else if (op == P_MOVEML_SP) | |
762 | { | |
763 | /* movem.l REGS,-(%sp) */ | |
e17a4113 | 764 | mask = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
765 | for (i = 0; i < 16; i++, mask >>= 1) |
766 | { | |
767 | if (mask & 1) | |
768 | { | |
769 | cache->saved_regs[15 - i] = offset; | |
770 | offset -= 4; | |
771 | } | |
772 | } | |
773 | pc += 4; | |
774 | } | |
775 | else | |
776 | break; | |
777 | } | |
778 | } | |
779 | ||
780 | return pc; | |
781 | } | |
c906108c | 782 | |
c906108c | 783 | |
8de307e0 AS |
784 | /* Do a full analysis of the prologue at PC and update CACHE |
785 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
786 | address where the analysis stopped. | |
c906108c | 787 | |
8de307e0 | 788 | We handle all cases that can be generated by gcc. |
c906108c | 789 | |
8de307e0 | 790 | For allocating a stack frame: |
c906108c | 791 | |
8de307e0 AS |
792 | link.w %a6,#-N |
793 | link.l %a6,#-N | |
794 | pea (%fp); move.l %sp,%fp | |
795 | link.w %a6,#0; add.l #-N,%sp | |
796 | subq.l #N,%sp | |
797 | subq.w #N,%sp | |
798 | subq.w #8,%sp; subq.w #N-8,%sp | |
799 | add.w #-N,%sp | |
800 | lea (-N,%sp),%sp | |
801 | add.l #-N,%sp | |
c906108c | 802 | |
8de307e0 | 803 | For saving registers: |
c906108c | 804 | |
8de307e0 AS |
805 | fmovem.x REGS,-(%sp) |
806 | move.l R1,-(%sp) | |
807 | move.l R1,-(%sp); move.l R2,-(%sp) | |
808 | movem.l REGS,-(%sp) | |
c906108c | 809 | |
8de307e0 | 810 | For setting up the PIC register: |
c906108c | 811 | |
8de307e0 | 812 | lea (%pc,N),%a5 |
c906108c | 813 | |
8de307e0 | 814 | */ |
c906108c | 815 | |
eb2e12d7 | 816 | static CORE_ADDR |
be8626e0 MD |
817 | m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
818 | CORE_ADDR current_pc, struct m68k_frame_cache *cache) | |
c906108c | 819 | { |
e17a4113 | 820 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 | 821 | unsigned int op; |
c906108c | 822 | |
e17a4113 | 823 | pc = m68k_analyze_frame_setup (gdbarch, pc, current_pc, cache); |
be8626e0 | 824 | pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache); |
8de307e0 AS |
825 | if (pc >= current_pc) |
826 | return current_pc; | |
c906108c | 827 | |
8de307e0 | 828 | /* Check for GOT setup. */ |
e17a4113 | 829 | op = read_memory_unsigned_integer (pc, 4, byte_order); |
8de307e0 | 830 | if (op == P_LEA_PC_A5) |
c906108c | 831 | { |
8de307e0 | 832 | /* lea (%pc,N),%a5 */ |
e4d8bc08 | 833 | return pc + 8; |
c906108c | 834 | } |
8de307e0 AS |
835 | |
836 | return pc; | |
c906108c SS |
837 | } |
838 | ||
8de307e0 | 839 | /* Return PC of first real instruction. */ |
7f8e7424 | 840 | |
8de307e0 | 841 | static CORE_ADDR |
6093d2eb | 842 | m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
c906108c | 843 | { |
8de307e0 AS |
844 | struct m68k_frame_cache cache; |
845 | CORE_ADDR pc; | |
c906108c | 846 | |
8de307e0 | 847 | cache.locals = -1; |
be8626e0 | 848 | pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache); |
8de307e0 AS |
849 | if (cache.locals < 0) |
850 | return start_pc; | |
851 | return pc; | |
852 | } | |
c906108c | 853 | |
8de307e0 AS |
854 | static CORE_ADDR |
855 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
856 | { | |
f5cf7aa1 | 857 | gdb_byte buf[8]; |
7f8e7424 | 858 | |
c984b7ff | 859 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
0dfff4cb | 860 | return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
8de307e0 AS |
861 | } |
862 | \f | |
863 | /* Normal frames. */ | |
7f8e7424 | 864 | |
8de307e0 | 865 | static struct m68k_frame_cache * |
f36bf22c | 866 | m68k_frame_cache (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 867 | { |
e17a4113 UW |
868 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
869 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8de307e0 | 870 | struct m68k_frame_cache *cache; |
f5cf7aa1 | 871 | gdb_byte buf[4]; |
8de307e0 AS |
872 | int i; |
873 | ||
874 | if (*this_cache) | |
9a3c8263 | 875 | return (struct m68k_frame_cache *) *this_cache; |
8de307e0 AS |
876 | |
877 | cache = m68k_alloc_frame_cache (); | |
878 | *this_cache = cache; | |
879 | ||
880 | /* In principle, for normal frames, %fp holds the frame pointer, | |
881 | which holds the base address for the current stack frame. | |
882 | However, for functions that don't need it, the frame pointer is | |
883 | optional. For these "frameless" functions the frame pointer is | |
884 | actually the frame pointer of the calling frame. Signal | |
885 | trampolines are just a special case of a "frameless" function. | |
886 | They (usually) share their frame pointer with the frame that was | |
887 | in progress when the signal occurred. */ | |
888 | ||
f36bf22c | 889 | get_frame_register (this_frame, M68K_FP_REGNUM, buf); |
e17a4113 | 890 | cache->base = extract_unsigned_integer (buf, 4, byte_order); |
8de307e0 AS |
891 | if (cache->base == 0) |
892 | return cache; | |
893 | ||
894 | /* For normal frames, %pc is stored at 4(%fp). */ | |
895 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
896 | ||
f36bf22c | 897 | cache->pc = get_frame_func (this_frame); |
8de307e0 | 898 | if (cache->pc != 0) |
f36bf22c AS |
899 | m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
900 | get_frame_pc (this_frame), cache); | |
8de307e0 AS |
901 | |
902 | if (cache->locals < 0) | |
903 | { | |
904 | /* We didn't find a valid frame, which means that CACHE->base | |
905 | currently holds the frame pointer for our calling frame. If | |
906 | we're at the start of a function, or somewhere half-way its | |
907 | prologue, the function's frame probably hasn't been fully | |
908 | setup yet. Try to reconstruct the base address for the stack | |
909 | frame by looking at the stack pointer. For truly "frameless" | |
910 | functions this might work too. */ | |
911 | ||
f36bf22c | 912 | get_frame_register (this_frame, M68K_SP_REGNUM, buf); |
e17a4113 UW |
913 | cache->base = extract_unsigned_integer (buf, 4, byte_order) |
914 | + cache->sp_offset; | |
8de307e0 | 915 | } |
7f8e7424 | 916 | |
8de307e0 AS |
917 | /* Now that we have the base address for the stack frame we can |
918 | calculate the value of %sp in the calling frame. */ | |
919 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 920 | |
8de307e0 AS |
921 | /* Adjust all the saved registers such that they contain addresses |
922 | instead of offsets. */ | |
923 | for (i = 0; i < M68K_NUM_REGS; i++) | |
924 | if (cache->saved_regs[i] != -1) | |
925 | cache->saved_regs[i] += cache->base; | |
c906108c | 926 | |
8de307e0 AS |
927 | return cache; |
928 | } | |
c906108c | 929 | |
8de307e0 | 930 | static void |
f36bf22c | 931 | m68k_frame_this_id (struct frame_info *this_frame, void **this_cache, |
8de307e0 AS |
932 | struct frame_id *this_id) |
933 | { | |
f36bf22c | 934 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
c906108c | 935 | |
8de307e0 AS |
936 | /* This marks the outermost frame. */ |
937 | if (cache->base == 0) | |
938 | return; | |
c5aa993b | 939 | |
8de307e0 AS |
940 | /* See the end of m68k_push_dummy_call. */ |
941 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
942 | } | |
c5aa993b | 943 | |
f36bf22c AS |
944 | static struct value * |
945 | m68k_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
946 | int regnum) | |
8de307e0 | 947 | { |
f36bf22c | 948 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
949 | |
950 | gdb_assert (regnum >= 0); | |
951 | ||
952 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
f36bf22c | 953 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
8de307e0 AS |
954 | |
955 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
f36bf22c AS |
956 | return frame_unwind_got_memory (this_frame, regnum, |
957 | cache->saved_regs[regnum]); | |
8de307e0 | 958 | |
f36bf22c | 959 | return frame_unwind_got_register (this_frame, regnum, regnum); |
8de307e0 AS |
960 | } |
961 | ||
962 | static const struct frame_unwind m68k_frame_unwind = | |
963 | { | |
964 | NORMAL_FRAME, | |
8fbca658 | 965 | default_frame_unwind_stop_reason, |
8de307e0 | 966 | m68k_frame_this_id, |
f36bf22c AS |
967 | m68k_frame_prev_register, |
968 | NULL, | |
969 | default_frame_sniffer | |
8de307e0 | 970 | }; |
8de307e0 | 971 | \f |
8de307e0 | 972 | static CORE_ADDR |
f36bf22c | 973 | m68k_frame_base_address (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 974 | { |
f36bf22c | 975 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
976 | |
977 | return cache->base; | |
978 | } | |
979 | ||
980 | static const struct frame_base m68k_frame_base = | |
981 | { | |
982 | &m68k_frame_unwind, | |
983 | m68k_frame_base_address, | |
984 | m68k_frame_base_address, | |
985 | m68k_frame_base_address | |
986 | }; | |
987 | ||
988 | static struct frame_id | |
f36bf22c | 989 | m68k_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
8de307e0 | 990 | { |
8de307e0 | 991 | CORE_ADDR fp; |
c906108c | 992 | |
f36bf22c | 993 | fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM); |
c906108c | 994 | |
8de307e0 | 995 | /* See the end of m68k_push_dummy_call. */ |
f36bf22c | 996 | return frame_id_build (fp + 8, get_frame_pc (this_frame)); |
8de307e0 AS |
997 | } |
998 | \f | |
c906108c | 999 | |
c906108c SS |
1000 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1001 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1002 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
025bb325 | 1003 | This routine returns true on success. */ |
c906108c | 1004 | |
c34d127c | 1005 | static int |
60ade65d | 1006 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 1007 | { |
f5cf7aa1 | 1008 | gdb_byte *buf; |
c906108c | 1009 | CORE_ADDR sp, jb_addr; |
c984b7ff | 1010 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
1011 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1012 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
eb2e12d7 AS |
1013 | |
1014 | if (tdep->jb_pc < 0) | |
1015 | { | |
1016 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1017 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1018 | return 0; |
1019 | } | |
c906108c | 1020 | |
224c3ddb | 1021 | buf = (gdb_byte *) alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
c984b7ff | 1022 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); |
c906108c | 1023 | |
025bb325 | 1024 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
c984b7ff | 1025 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1026 | return 0; |
1027 | ||
c984b7ff | 1028 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1029 | / TARGET_CHAR_BIT, byte_order); |
c906108c | 1030 | |
eb2e12d7 | 1031 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
e17a4113 UW |
1032 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT), |
1033 | byte_order) | |
c906108c SS |
1034 | return 0; |
1035 | ||
c984b7ff | 1036 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1037 | / TARGET_CHAR_BIT, byte_order); |
c906108c SS |
1038 | return 1; |
1039 | } | |
f595cb19 MK |
1040 | \f |
1041 | ||
18648a37 YQ |
1042 | /* This is the implementation of gdbarch method |
1043 | return_in_first_hidden_param_p. */ | |
1044 | ||
1045 | static int | |
1046 | m68k_return_in_first_hidden_param_p (struct gdbarch *gdbarch, | |
1047 | struct type *type) | |
1048 | { | |
1049 | return 0; | |
1050 | } | |
1051 | ||
f595cb19 MK |
1052 | /* System V Release 4 (SVR4). */ |
1053 | ||
1054 | void | |
1055 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1056 | { | |
1057 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1058 | ||
1059 | /* SVR4 uses a different calling convention. */ | |
1060 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1061 | ||
1062 | /* SVR4 uses %a0 instead of %a1. */ | |
1063 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1064 | } | |
1065 | \f | |
c906108c | 1066 | |
152d9db6 GS |
1067 | /* Function: m68k_gdbarch_init |
1068 | Initializer function for the m68k gdbarch vector. | |
025bb325 | 1069 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
152d9db6 GS |
1070 | |
1071 | static struct gdbarch * | |
1072 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1073 | { | |
1074 | struct gdbarch_tdep *tdep = NULL; | |
1075 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1076 | struct gdbarch_list *best_arch; |
1077 | struct tdesc_arch_data *tdesc_data = NULL; | |
1078 | int i; | |
1079 | enum m68k_flavour flavour = m68k_no_flavour; | |
1080 | int has_fp = 1; | |
1081 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1082 | ||
1083 | /* Check any target description for validity. */ | |
1084 | if (tdesc_has_registers (info.target_desc)) | |
1085 | { | |
1086 | const struct tdesc_feature *feature; | |
1087 | int valid_p; | |
152d9db6 | 1088 | |
8ed86d01 VP |
1089 | feature = tdesc_find_feature (info.target_desc, |
1090 | "org.gnu.gdb.m68k.core"); | |
8ed86d01 VP |
1091 | |
1092 | if (feature == NULL) | |
1093 | { | |
1094 | feature = tdesc_find_feature (info.target_desc, | |
1095 | "org.gnu.gdb.coldfire.core"); | |
1096 | if (feature != NULL) | |
1097 | flavour = m68k_coldfire_flavour; | |
1098 | } | |
1099 | ||
1100 | if (feature == NULL) | |
1101 | { | |
1102 | feature = tdesc_find_feature (info.target_desc, | |
1103 | "org.gnu.gdb.fido.core"); | |
1104 | if (feature != NULL) | |
1105 | flavour = m68k_fido_flavour; | |
1106 | } | |
1107 | ||
1108 | if (feature == NULL) | |
1109 | return NULL; | |
1110 | ||
1111 | tdesc_data = tdesc_data_alloc (); | |
1112 | ||
1113 | valid_p = 1; | |
1114 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1115 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1116 | m68k_register_names[i]); | |
1117 | ||
1118 | if (!valid_p) | |
1119 | { | |
1120 | tdesc_data_cleanup (tdesc_data); | |
1121 | return NULL; | |
1122 | } | |
1123 | ||
1124 | feature = tdesc_find_feature (info.target_desc, | |
1125 | "org.gnu.gdb.coldfire.fp"); | |
1126 | if (feature != NULL) | |
1127 | { | |
1128 | valid_p = 1; | |
1129 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1130 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1131 | m68k_register_names[i]); | |
1132 | if (!valid_p) | |
1133 | { | |
1134 | tdesc_data_cleanup (tdesc_data); | |
1135 | return NULL; | |
1136 | } | |
1137 | } | |
1138 | else | |
1139 | has_fp = 0; | |
1140 | } | |
1141 | ||
1142 | /* The mechanism for returning floating values from function | |
1143 | and the type of long double depend on whether we're | |
025bb325 | 1144 | on ColdFire or standard m68k. */ |
8ed86d01 | 1145 | |
4ed77933 | 1146 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1147 | { |
1148 | const bfd_arch_info_type *coldfire_arch = | |
1149 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1150 | ||
1151 | if (coldfire_arch | |
4ed77933 AS |
1152 | && ((*info.bfd_arch_info->compatible) |
1153 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1154 | flavour = m68k_coldfire_flavour; |
1155 | } | |
1156 | ||
1157 | /* If there is already a candidate, use it. */ | |
1158 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1159 | best_arch != NULL; | |
1160 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1161 | { | |
1162 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1163 | continue; | |
1164 | ||
1165 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1166 | continue; | |
1167 | ||
1168 | break; | |
1169 | } | |
152d9db6 | 1170 | |
0c85e18e MK |
1171 | if (best_arch != NULL) |
1172 | { | |
1173 | if (tdesc_data != NULL) | |
1174 | tdesc_data_cleanup (tdesc_data); | |
1175 | return best_arch->gdbarch; | |
1176 | } | |
1177 | ||
8d749320 | 1178 | tdep = XCNEW (struct gdbarch_tdep); |
eb2e12d7 | 1179 | gdbarch = gdbarch_alloc (&info, tdep); |
8ed86d01 VP |
1180 | tdep->fpregs_present = has_fp; |
1181 | tdep->flavour = flavour; | |
152d9db6 | 1182 | |
8ed86d01 VP |
1183 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1184 | long_double_format = floatformats_ieee_double; | |
1185 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1186 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1187 | |
5d3ed2e3 | 1188 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
04180708 YQ |
1189 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, m68k_breakpoint::kind_from_pc); |
1190 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, m68k_breakpoint::bp_from_kind); | |
5d3ed2e3 | 1191 | |
025bb325 | 1192 | /* Stack grows down. */ |
5d3ed2e3 | 1193 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
9bb47d95 | 1194 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1195 | |
1196 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1197 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1198 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1199 | |
6300c360 | 1200 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 | 1201 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
942dc0e9 | 1202 | |
8de307e0 | 1203 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1204 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1205 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1206 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1207 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1208 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
e47577ab MK |
1209 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1210 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1211 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1212 | |
8ed86d01 VP |
1213 | if (has_fp) |
1214 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1215 | ||
1216 | /* Try to figure out if the arch uses floating registers to return | |
1217 | floating point values from functions. */ | |
1218 | if (has_fp) | |
1219 | { | |
1220 | /* On ColdFire, floating point values are returned in D0. */ | |
1221 | if (flavour == m68k_coldfire_flavour) | |
1222 | tdep->float_return = 0; | |
1223 | else | |
1224 | tdep->float_return = 1; | |
1225 | } | |
1226 | else | |
1227 | { | |
1228 | /* No floating registers, so can't use them for returning values. */ | |
1229 | tdep->float_return = 0; | |
1230 | } | |
1231 | ||
025bb325 | 1232 | /* Function call & return. */ |
8de307e0 | 1233 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1234 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
18648a37 YQ |
1235 | set_gdbarch_return_in_first_hidden_param_p (gdbarch, |
1236 | m68k_return_in_first_hidden_param_p); | |
6c0e89ed | 1237 | |
eb2e12d7 AS |
1238 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1239 | tdep->jb_pc = JB_PC; | |
1240 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1241 | #else | |
1242 | tdep->jb_pc = -1; | |
1243 | #endif | |
f595cb19 | 1244 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1245 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1246 | |
1247 | /* Frame unwinder. */ | |
f36bf22c | 1248 | set_gdbarch_dummy_id (gdbarch, m68k_dummy_id); |
8de307e0 | 1249 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
3f244638 AS |
1250 | |
1251 | /* Hook in the DWARF CFI frame unwinder. */ | |
f36bf22c | 1252 | dwarf2_append_unwinders (gdbarch); |
3f244638 | 1253 | |
8de307e0 | 1254 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1255 | |
55809acb AS |
1256 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1257 | gdbarch_init_osabi (info, gdbarch); | |
1258 | ||
eb2e12d7 AS |
1259 | /* Now we have tuned the configuration, set a few final things, |
1260 | based on what the OS ABI has told us. */ | |
1261 | ||
1262 | if (tdep->jb_pc >= 0) | |
1263 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1264 | ||
f36bf22c | 1265 | frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind); |
8de307e0 | 1266 | |
8ed86d01 | 1267 | if (tdesc_data) |
7cc46491 | 1268 | tdesc_use_registers (gdbarch, info.target_desc, tdesc_data); |
8ed86d01 | 1269 | |
152d9db6 GS |
1270 | return gdbarch; |
1271 | } | |
1272 | ||
1273 | ||
1274 | static void | |
c984b7ff | 1275 | m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
152d9db6 | 1276 | { |
c984b7ff | 1277 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
152d9db6 | 1278 | |
eb2e12d7 AS |
1279 | if (tdep == NULL) |
1280 | return; | |
152d9db6 | 1281 | } |
2acceee2 | 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 | } |