Commit | Line | Data |
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748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b | 2 | |
618f726f | 3 | Copyright (C) 1990-2016 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 |
3c1ac6e7 | 191 | && type != register_type (gdbarch, M68K_FP0_REGNUM)); |
e47577ab MK |
192 | } |
193 | ||
194 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
195 | return its contents in TO. */ | |
196 | ||
8dccd430 | 197 | static int |
e47577ab | 198 | m68k_register_to_value (struct frame_info *frame, int regnum, |
8dccd430 PA |
199 | struct type *type, gdb_byte *to, |
200 | int *optimizedp, int *unavailablep) | |
e47577ab | 201 | { |
f5cf7aa1 | 202 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
203 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
204 | M68K_FP0_REGNUM); | |
e47577ab MK |
205 | |
206 | /* We only support floating-point values. */ | |
207 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
208 | { | |
8a3fe4f8 AC |
209 | warning (_("Cannot convert floating-point register value " |
210 | "to non-floating-point type.")); | |
8dccd430 PA |
211 | *optimizedp = *unavailablep = 0; |
212 | return 0; | |
e47577ab MK |
213 | } |
214 | ||
83acabca | 215 | /* Convert to TYPE. */ |
8dccd430 PA |
216 | |
217 | /* Convert to TYPE. */ | |
218 | if (!get_frame_register_bytes (frame, regnum, 0, TYPE_LENGTH (type), | |
219 | from, optimizedp, unavailablep)) | |
220 | return 0; | |
221 | ||
8ed86d01 | 222 | convert_typed_floating (from, fpreg_type, to, type); |
8dccd430 PA |
223 | *optimizedp = *unavailablep = 0; |
224 | return 1; | |
e47577ab MK |
225 | } |
226 | ||
227 | /* Write the contents FROM of a value of type TYPE into register | |
228 | REGNUM in frame FRAME. */ | |
229 | ||
230 | static void | |
231 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 232 | struct type *type, const gdb_byte *from) |
e47577ab | 233 | { |
f5cf7aa1 | 234 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
235 | struct type *fpreg_type = register_type (get_frame_arch (frame), |
236 | M68K_FP0_REGNUM); | |
e47577ab MK |
237 | |
238 | /* We only support floating-point values. */ | |
239 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
240 | { | |
8a3fe4f8 AC |
241 | warning (_("Cannot convert non-floating-point type " |
242 | "to floating-point register value.")); | |
e47577ab MK |
243 | return; |
244 | } | |
245 | ||
83acabca | 246 | /* Convert from TYPE. */ |
8ed86d01 | 247 | convert_typed_floating (from, type, to, fpreg_type); |
e47577ab MK |
248 | put_frame_register (frame, regnum, to); |
249 | } | |
250 | ||
8de307e0 | 251 | \f |
f595cb19 MK |
252 | /* There is a fair number of calling conventions that are in somewhat |
253 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
254 | coprocessor. All function return values are stored in %d0/%d1. | |
255 | Structures are returned in a static buffer, a pointer to which is | |
256 | returned in %d0. This means that functions returning a structure | |
257 | are not re-entrant. To avoid this problem some systems use a | |
258 | convention where the caller passes a pointer to a buffer in %a1 | |
259 | where the return values is to be stored. This convention is the | |
260 | default, and is implemented in the function m68k_return_value. | |
261 | ||
262 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
263 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
264 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
265 | psABI. Integer values are returned in %d0/%d1, pointer return | |
266 | values in %a0 and floating values in %fp0. When calling functions | |
267 | returning a structure the caller should pass a pointer to a buffer | |
268 | for the return value in %a0. This convention is implemented in the | |
269 | function m68k_svr4_return_value, and by appropriately setting the | |
270 | struct_value_regnum member of `struct gdbarch_tdep'. | |
271 | ||
272 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
273 | for passing the structure return value buffer. | |
274 | ||
275 | GCC can also generate code where small structures are returned in | |
276 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
277 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
278 | embedded systems. This convention is implemented by setting the | |
279 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
280 | ||
281 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 282 | into VALBUF. */ |
942dc0e9 GS |
283 | |
284 | static void | |
8de307e0 | 285 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 286 | gdb_byte *valbuf) |
942dc0e9 | 287 | { |
8de307e0 | 288 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 289 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 290 | |
8de307e0 AS |
291 | if (len <= 4) |
292 | { | |
293 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
294 | memcpy (valbuf, buf + (4 - len), len); | |
295 | } | |
296 | else if (len <= 8) | |
297 | { | |
298 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
299 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 300 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
301 | } |
302 | else | |
303 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 304 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
305 | } |
306 | ||
942dc0e9 | 307 | static void |
f595cb19 | 308 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 309 | gdb_byte *valbuf) |
942dc0e9 | 310 | { |
f5cf7aa1 | 311 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
c984b7ff UW |
312 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
313 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
942dc0e9 | 314 | |
8ed86d01 | 315 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 316 | { |
c984b7ff | 317 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f595cb19 | 318 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
8ed86d01 | 319 | convert_typed_floating (buf, fpreg_type, valbuf, type); |
8de307e0 | 320 | } |
354ecfd5 | 321 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4) |
f595cb19 MK |
322 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); |
323 | else | |
324 | m68k_extract_return_value (type, regcache, valbuf); | |
325 | } | |
326 | ||
327 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
328 | ||
329 | static void | |
330 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 331 | const gdb_byte *valbuf) |
f595cb19 MK |
332 | { |
333 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 334 | |
8de307e0 AS |
335 | if (len <= 4) |
336 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
337 | else if (len <= 8) | |
338 | { | |
f595cb19 | 339 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 340 | len - 4, valbuf); |
f5cf7aa1 | 341 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
342 | } |
343 | else | |
344 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 345 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 346 | } |
942dc0e9 | 347 | |
f595cb19 MK |
348 | static void |
349 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 350 | const gdb_byte *valbuf) |
942dc0e9 | 351 | { |
c984b7ff UW |
352 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
353 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
8de307e0 | 354 | |
8ed86d01 | 355 | if (tdep->float_return && TYPE_CODE (type) == TYPE_CODE_FLT) |
f595cb19 | 356 | { |
c984b7ff | 357 | struct type *fpreg_type = register_type (gdbarch, M68K_FP0_REGNUM); |
f5cf7aa1 | 358 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
8ed86d01 | 359 | convert_typed_floating (valbuf, type, buf, fpreg_type); |
f595cb19 MK |
360 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); |
361 | } | |
354ecfd5 | 362 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && TYPE_LENGTH (type) == 4) |
f595cb19 MK |
363 | { |
364 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
365 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
366 | } | |
367 | else | |
368 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
369 | } |
370 | ||
108fb0f7 AS |
371 | /* Return non-zero if TYPE, which is assumed to be a structure, union or |
372 | complex type, should be returned in registers for architecture | |
f595cb19 MK |
373 | GDBARCH. */ |
374 | ||
c481dac7 | 375 | static int |
f595cb19 | 376 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 377 | { |
f595cb19 MK |
378 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
379 | enum type_code code = TYPE_CODE (type); | |
380 | int len = TYPE_LENGTH (type); | |
c481dac7 | 381 | |
108fb0f7 AS |
382 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
383 | || code == TYPE_CODE_COMPLEX); | |
f595cb19 MK |
384 | |
385 | if (tdep->struct_return == pcc_struct_return) | |
386 | return 0; | |
387 | ||
388 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
389 | } |
390 | ||
f595cb19 MK |
391 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
392 | should be returned. If it is supposed to be returned in registers, | |
393 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
394 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
395 | from WRITEBUF into REGCACHE. */ | |
396 | ||
397 | static enum return_value_convention | |
6a3a010b | 398 | m68k_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
399 | struct type *type, struct regcache *regcache, |
400 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
401 | { |
402 | enum type_code code = TYPE_CODE (type); | |
403 | ||
1c845060 | 404 | /* GCC returns a `long double' in memory too. */ |
108fb0f7 AS |
405 | if (((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
406 | || code == TYPE_CODE_COMPLEX) | |
1c845060 MK |
407 | && !m68k_reg_struct_return_p (gdbarch, type)) |
408 | || (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12)) | |
409 | { | |
410 | /* The default on m68k is to return structures in static memory. | |
411 | Consequently a function must return the address where we can | |
412 | find the return value. */ | |
f595cb19 | 413 | |
1c845060 MK |
414 | if (readbuf) |
415 | { | |
416 | ULONGEST addr; | |
417 | ||
418 | regcache_raw_read_unsigned (regcache, M68K_D0_REGNUM, &addr); | |
419 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
420 | } | |
421 | ||
422 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
423 | } | |
f595cb19 MK |
424 | |
425 | if (readbuf) | |
426 | m68k_extract_return_value (type, regcache, readbuf); | |
427 | if (writebuf) | |
428 | m68k_store_return_value (type, regcache, writebuf); | |
429 | ||
430 | return RETURN_VALUE_REGISTER_CONVENTION; | |
431 | } | |
432 | ||
433 | static enum return_value_convention | |
6a3a010b | 434 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
435 | struct type *type, struct regcache *regcache, |
436 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
f595cb19 MK |
437 | { |
438 | enum type_code code = TYPE_CODE (type); | |
439 | ||
108fb0f7 AS |
440 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION |
441 | || code == TYPE_CODE_COMPLEX) | |
f595cb19 | 442 | && !m68k_reg_struct_return_p (gdbarch, type)) |
51da707a MK |
443 | { |
444 | /* The System V ABI says that: | |
445 | ||
446 | "A function returning a structure or union also sets %a0 to | |
447 | the value it finds in %a0. Thus when the caller receives | |
448 | control again, the address of the returned object resides in | |
449 | register %a0." | |
450 | ||
451 | So the ABI guarantees that we can always find the return | |
452 | value just after the function has returned. */ | |
453 | ||
454 | if (readbuf) | |
455 | { | |
456 | ULONGEST addr; | |
457 | ||
458 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
459 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
460 | } | |
461 | ||
462 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
463 | } | |
f595cb19 MK |
464 | |
465 | /* This special case is for structures consisting of a single | |
466 | `float' or `double' member. These structures are returned in | |
467 | %fp0. For these structures, we call ourselves recursively, | |
468 | changing TYPE into the type of the first member of the structure. | |
469 | Since that should work for all structures that have only one | |
470 | member, we don't bother to check the member's type here. */ | |
471 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
472 | { | |
473 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
6a3a010b | 474 | return m68k_svr4_return_value (gdbarch, function, type, regcache, |
f595cb19 MK |
475 | readbuf, writebuf); |
476 | } | |
477 | ||
478 | if (readbuf) | |
479 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
480 | if (writebuf) | |
481 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
482 | ||
483 | return RETURN_VALUE_REGISTER_CONVENTION; | |
484 | } | |
485 | \f | |
392a587b | 486 | |
9bb47d95 NS |
487 | /* Always align the frame to a 4-byte boundary. This is required on |
488 | coldfire and harmless on the rest. */ | |
489 | ||
490 | static CORE_ADDR | |
491 | m68k_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) | |
492 | { | |
493 | /* Align the stack to four bytes. */ | |
494 | return sp & ~3; | |
495 | } | |
496 | ||
8de307e0 | 497 | static CORE_ADDR |
7d9b040b | 498 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
499 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
500 | struct value **args, CORE_ADDR sp, int struct_return, | |
501 | CORE_ADDR struct_addr) | |
7f8e7424 | 502 | { |
f595cb19 | 503 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 504 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
f5cf7aa1 | 505 | gdb_byte buf[4]; |
8de307e0 AS |
506 | int i; |
507 | ||
508 | /* Push arguments in reverse order. */ | |
509 | for (i = nargs - 1; i >= 0; i--) | |
510 | { | |
4754a64e | 511 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 512 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 513 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
514 | int offset; |
515 | ||
516 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
517 | right aligned. */ | |
518 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
519 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
520 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
521 | && len > 4) | |
522 | offset = 0; | |
523 | else | |
524 | offset = container_len - len; | |
8de307e0 | 525 | sp -= container_len; |
46615f07 | 526 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
527 | } |
528 | ||
c481dac7 | 529 | /* Store struct value address. */ |
8de307e0 AS |
530 | if (struct_return) |
531 | { | |
e17a4113 | 532 | store_unsigned_integer (buf, 4, byte_order, struct_addr); |
f595cb19 | 533 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
534 | } |
535 | ||
536 | /* Store return address. */ | |
537 | sp -= 4; | |
e17a4113 | 538 | store_unsigned_integer (buf, 4, byte_order, bp_addr); |
8de307e0 AS |
539 | write_memory (sp, buf, 4); |
540 | ||
541 | /* Finally, update the stack pointer... */ | |
e17a4113 | 542 | store_unsigned_integer (buf, 4, byte_order, sp); |
8de307e0 AS |
543 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); |
544 | ||
545 | /* ...and fake a frame pointer. */ | |
546 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
547 | ||
548 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
549 | frame's CFA. */ | |
550 | return sp + 8; | |
7f8e7424 | 551 | } |
6dd0fba6 NS |
552 | |
553 | /* Convert a dwarf or dwarf2 regnumber to a GDB regnum. */ | |
554 | ||
555 | static int | |
d3f73121 | 556 | m68k_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int num) |
6dd0fba6 NS |
557 | { |
558 | if (num < 8) | |
559 | /* d0..7 */ | |
560 | return (num - 0) + M68K_D0_REGNUM; | |
561 | else if (num < 16) | |
562 | /* a0..7 */ | |
563 | return (num - 8) + M68K_A0_REGNUM; | |
d3f73121 | 564 | else if (num < 24 && gdbarch_tdep (gdbarch)->fpregs_present) |
6dd0fba6 NS |
565 | /* fp0..7 */ |
566 | return (num - 16) + M68K_FP0_REGNUM; | |
567 | else if (num == 25) | |
568 | /* pc */ | |
569 | return M68K_PC_REGNUM; | |
570 | else | |
0fde2c53 | 571 | return -1; |
6dd0fba6 NS |
572 | } |
573 | ||
8de307e0 AS |
574 | \f |
575 | struct m68k_frame_cache | |
576 | { | |
577 | /* Base address. */ | |
578 | CORE_ADDR base; | |
579 | CORE_ADDR sp_offset; | |
580 | CORE_ADDR pc; | |
7f8e7424 | 581 | |
8de307e0 AS |
582 | /* Saved registers. */ |
583 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
584 | CORE_ADDR saved_sp; | |
7f8e7424 | 585 | |
8de307e0 AS |
586 | /* Stack space reserved for local variables. */ |
587 | long locals; | |
588 | }; | |
c906108c | 589 | |
8de307e0 AS |
590 | /* Allocate and initialize a frame cache. */ |
591 | ||
592 | static struct m68k_frame_cache * | |
593 | m68k_alloc_frame_cache (void) | |
c906108c | 594 | { |
8de307e0 AS |
595 | struct m68k_frame_cache *cache; |
596 | int i; | |
c906108c | 597 | |
8de307e0 | 598 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 599 | |
8de307e0 AS |
600 | /* Base address. */ |
601 | cache->base = 0; | |
602 | cache->sp_offset = -4; | |
603 | cache->pc = 0; | |
c906108c | 604 | |
8de307e0 AS |
605 | /* Saved registers. We initialize these to -1 since zero is a valid |
606 | offset (that's where %fp is supposed to be stored). */ | |
607 | for (i = 0; i < M68K_NUM_REGS; i++) | |
608 | cache->saved_regs[i] = -1; | |
609 | ||
610 | /* Frameless until proven otherwise. */ | |
611 | cache->locals = -1; | |
612 | ||
613 | return cache; | |
c906108c SS |
614 | } |
615 | ||
8de307e0 AS |
616 | /* Check whether PC points at a code that sets up a new stack frame. |
617 | If so, it updates CACHE and returns the address of the first | |
618 | instruction after the sequence that sets removes the "hidden" | |
619 | argument from the stack or CURRENT_PC, whichever is smaller. | |
620 | Otherwise, return PC. */ | |
c906108c | 621 | |
8de307e0 | 622 | static CORE_ADDR |
e17a4113 UW |
623 | m68k_analyze_frame_setup (struct gdbarch *gdbarch, |
624 | CORE_ADDR pc, CORE_ADDR current_pc, | |
8de307e0 | 625 | struct m68k_frame_cache *cache) |
c906108c | 626 | { |
e17a4113 | 627 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 AS |
628 | int op; |
629 | ||
630 | if (pc >= current_pc) | |
631 | return current_pc; | |
c906108c | 632 | |
e17a4113 | 633 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8de307e0 AS |
634 | |
635 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 636 | { |
8de307e0 AS |
637 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
638 | cache->sp_offset += 4; | |
639 | if (op == P_LINKW_FP) | |
640 | { | |
641 | /* link.w %fp, #-N */ | |
642 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
e17a4113 | 643 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
644 | |
645 | if (pc + 4 < current_pc && cache->locals == 0) | |
646 | { | |
e17a4113 | 647 | op = read_memory_unsigned_integer (pc + 4, 2, byte_order); |
8de307e0 AS |
648 | if (op == P_ADDAL_SP) |
649 | { | |
e17a4113 | 650 | cache->locals = read_memory_integer (pc + 6, 4, byte_order); |
8de307e0 AS |
651 | return pc + 10; |
652 | } | |
653 | } | |
654 | ||
655 | return pc + 4; | |
656 | } | |
657 | else if (op == P_LINKL_FP) | |
c906108c | 658 | { |
8de307e0 | 659 | /* link.l %fp, #-N */ |
e17a4113 | 660 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 AS |
661 | return pc + 6; |
662 | } | |
663 | else | |
664 | { | |
665 | /* pea (%fp); movea.l %sp, %fp */ | |
666 | cache->locals = 0; | |
667 | ||
668 | if (pc + 2 < current_pc) | |
669 | { | |
e17a4113 | 670 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
671 | |
672 | if (op == P_MOVEAL_SP_FP) | |
673 | { | |
674 | /* move.l %sp, %fp */ | |
675 | return pc + 4; | |
676 | } | |
677 | } | |
678 | ||
679 | return pc + 2; | |
c906108c SS |
680 | } |
681 | } | |
8de307e0 | 682 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 683 | { |
8de307e0 AS |
684 | /* subq.[wl] #N,%sp */ |
685 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
686 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
687 | if (pc + 2 < current_pc) | |
c906108c | 688 | { |
e17a4113 | 689 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
690 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
691 | { | |
692 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
693 | return pc + 4; | |
694 | } | |
c906108c | 695 | } |
8de307e0 AS |
696 | return pc + 2; |
697 | } | |
698 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
699 | { | |
700 | /* adda.w #-N,%sp */ | |
701 | /* lea (-N,%sp),%sp */ | |
e17a4113 | 702 | cache->locals = -read_memory_integer (pc + 2, 2, byte_order); |
8de307e0 | 703 | return pc + 4; |
c906108c | 704 | } |
8de307e0 | 705 | else if (op == P_ADDAL_SP) |
c906108c | 706 | { |
8de307e0 | 707 | /* adda.l #-N,%sp */ |
e17a4113 | 708 | cache->locals = -read_memory_integer (pc + 2, 4, byte_order); |
8de307e0 | 709 | return pc + 6; |
c906108c | 710 | } |
8de307e0 AS |
711 | |
712 | return pc; | |
c906108c | 713 | } |
c5aa993b | 714 | |
8de307e0 AS |
715 | /* Check whether PC points at code that saves registers on the stack. |
716 | If so, it updates CACHE and returns the address of the first | |
717 | instruction after the register saves or CURRENT_PC, whichever is | |
718 | smaller. Otherwise, return PC. */ | |
c906108c | 719 | |
8de307e0 | 720 | static CORE_ADDR |
be8626e0 MD |
721 | m68k_analyze_register_saves (struct gdbarch *gdbarch, CORE_ADDR pc, |
722 | CORE_ADDR current_pc, | |
8de307e0 AS |
723 | struct m68k_frame_cache *cache) |
724 | { | |
e17a4113 UW |
725 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
726 | ||
8de307e0 AS |
727 | if (cache->locals >= 0) |
728 | { | |
729 | CORE_ADDR offset; | |
730 | int op; | |
731 | int i, mask, regno; | |
c906108c | 732 | |
8de307e0 AS |
733 | offset = -4 - cache->locals; |
734 | while (pc < current_pc) | |
735 | { | |
e17a4113 | 736 | op = read_memory_unsigned_integer (pc, 2, byte_order); |
8ed86d01 | 737 | if (op == P_FMOVEMX_SP |
be8626e0 | 738 | && gdbarch_tdep (gdbarch)->fpregs_present) |
8de307e0 AS |
739 | { |
740 | /* fmovem.x REGS,-(%sp) */ | |
e17a4113 | 741 | op = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
742 | if ((op & 0xff00) == 0xe000) |
743 | { | |
744 | mask = op & 0xff; | |
745 | for (i = 0; i < 16; i++, mask >>= 1) | |
746 | { | |
747 | if (mask & 1) | |
748 | { | |
749 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
750 | offset -= 12; | |
751 | } | |
752 | } | |
753 | pc += 4; | |
754 | } | |
755 | else | |
756 | break; | |
757 | } | |
0ba5a932 | 758 | else if ((op & 0177760) == P_MOVEL_SP) |
8de307e0 AS |
759 | { |
760 | /* move.l %R,-(%sp) */ | |
0ba5a932 | 761 | regno = op & 017; |
8de307e0 AS |
762 | cache->saved_regs[regno] = offset; |
763 | offset -= 4; | |
764 | pc += 2; | |
765 | } | |
766 | else if (op == P_MOVEML_SP) | |
767 | { | |
768 | /* movem.l REGS,-(%sp) */ | |
e17a4113 | 769 | mask = read_memory_unsigned_integer (pc + 2, 2, byte_order); |
8de307e0 AS |
770 | for (i = 0; i < 16; i++, mask >>= 1) |
771 | { | |
772 | if (mask & 1) | |
773 | { | |
774 | cache->saved_regs[15 - i] = offset; | |
775 | offset -= 4; | |
776 | } | |
777 | } | |
778 | pc += 4; | |
779 | } | |
780 | else | |
781 | break; | |
782 | } | |
783 | } | |
784 | ||
785 | return pc; | |
786 | } | |
c906108c | 787 | |
c906108c | 788 | |
8de307e0 AS |
789 | /* Do a full analysis of the prologue at PC and update CACHE |
790 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
791 | address where the analysis stopped. | |
c906108c | 792 | |
8de307e0 | 793 | We handle all cases that can be generated by gcc. |
c906108c | 794 | |
8de307e0 | 795 | For allocating a stack frame: |
c906108c | 796 | |
8de307e0 AS |
797 | link.w %a6,#-N |
798 | link.l %a6,#-N | |
799 | pea (%fp); move.l %sp,%fp | |
800 | link.w %a6,#0; add.l #-N,%sp | |
801 | subq.l #N,%sp | |
802 | subq.w #N,%sp | |
803 | subq.w #8,%sp; subq.w #N-8,%sp | |
804 | add.w #-N,%sp | |
805 | lea (-N,%sp),%sp | |
806 | add.l #-N,%sp | |
c906108c | 807 | |
8de307e0 | 808 | For saving registers: |
c906108c | 809 | |
8de307e0 AS |
810 | fmovem.x REGS,-(%sp) |
811 | move.l R1,-(%sp) | |
812 | move.l R1,-(%sp); move.l R2,-(%sp) | |
813 | movem.l REGS,-(%sp) | |
c906108c | 814 | |
8de307e0 | 815 | For setting up the PIC register: |
c906108c | 816 | |
8de307e0 | 817 | lea (%pc,N),%a5 |
c906108c | 818 | |
8de307e0 | 819 | */ |
c906108c | 820 | |
eb2e12d7 | 821 | static CORE_ADDR |
be8626e0 MD |
822 | m68k_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc, |
823 | CORE_ADDR current_pc, struct m68k_frame_cache *cache) | |
c906108c | 824 | { |
e17a4113 | 825 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
8de307e0 | 826 | unsigned int op; |
c906108c | 827 | |
e17a4113 | 828 | pc = m68k_analyze_frame_setup (gdbarch, pc, current_pc, cache); |
be8626e0 | 829 | pc = m68k_analyze_register_saves (gdbarch, pc, current_pc, cache); |
8de307e0 AS |
830 | if (pc >= current_pc) |
831 | return current_pc; | |
c906108c | 832 | |
8de307e0 | 833 | /* Check for GOT setup. */ |
e17a4113 | 834 | op = read_memory_unsigned_integer (pc, 4, byte_order); |
8de307e0 | 835 | if (op == P_LEA_PC_A5) |
c906108c | 836 | { |
8de307e0 | 837 | /* lea (%pc,N),%a5 */ |
e4d8bc08 | 838 | return pc + 8; |
c906108c | 839 | } |
8de307e0 AS |
840 | |
841 | return pc; | |
c906108c SS |
842 | } |
843 | ||
8de307e0 | 844 | /* Return PC of first real instruction. */ |
7f8e7424 | 845 | |
8de307e0 | 846 | static CORE_ADDR |
6093d2eb | 847 | m68k_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
c906108c | 848 | { |
8de307e0 AS |
849 | struct m68k_frame_cache cache; |
850 | CORE_ADDR pc; | |
c906108c | 851 | |
8de307e0 | 852 | cache.locals = -1; |
be8626e0 | 853 | pc = m68k_analyze_prologue (gdbarch, start_pc, (CORE_ADDR) -1, &cache); |
8de307e0 AS |
854 | if (cache.locals < 0) |
855 | return start_pc; | |
856 | return pc; | |
857 | } | |
c906108c | 858 | |
8de307e0 AS |
859 | static CORE_ADDR |
860 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
861 | { | |
f5cf7aa1 | 862 | gdb_byte buf[8]; |
7f8e7424 | 863 | |
c984b7ff | 864 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
0dfff4cb | 865 | return extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
8de307e0 AS |
866 | } |
867 | \f | |
868 | /* Normal frames. */ | |
7f8e7424 | 869 | |
8de307e0 | 870 | static struct m68k_frame_cache * |
f36bf22c | 871 | m68k_frame_cache (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 872 | { |
e17a4113 UW |
873 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
874 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
8de307e0 | 875 | struct m68k_frame_cache *cache; |
f5cf7aa1 | 876 | gdb_byte buf[4]; |
8de307e0 AS |
877 | int i; |
878 | ||
879 | if (*this_cache) | |
9a3c8263 | 880 | return (struct m68k_frame_cache *) *this_cache; |
8de307e0 AS |
881 | |
882 | cache = m68k_alloc_frame_cache (); | |
883 | *this_cache = cache; | |
884 | ||
885 | /* In principle, for normal frames, %fp holds the frame pointer, | |
886 | which holds the base address for the current stack frame. | |
887 | However, for functions that don't need it, the frame pointer is | |
888 | optional. For these "frameless" functions the frame pointer is | |
889 | actually the frame pointer of the calling frame. Signal | |
890 | trampolines are just a special case of a "frameless" function. | |
891 | They (usually) share their frame pointer with the frame that was | |
892 | in progress when the signal occurred. */ | |
893 | ||
f36bf22c | 894 | get_frame_register (this_frame, M68K_FP_REGNUM, buf); |
e17a4113 | 895 | cache->base = extract_unsigned_integer (buf, 4, byte_order); |
8de307e0 AS |
896 | if (cache->base == 0) |
897 | return cache; | |
898 | ||
899 | /* For normal frames, %pc is stored at 4(%fp). */ | |
900 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
901 | ||
f36bf22c | 902 | cache->pc = get_frame_func (this_frame); |
8de307e0 | 903 | if (cache->pc != 0) |
f36bf22c AS |
904 | m68k_analyze_prologue (get_frame_arch (this_frame), cache->pc, |
905 | get_frame_pc (this_frame), cache); | |
8de307e0 AS |
906 | |
907 | if (cache->locals < 0) | |
908 | { | |
909 | /* We didn't find a valid frame, which means that CACHE->base | |
910 | currently holds the frame pointer for our calling frame. If | |
911 | we're at the start of a function, or somewhere half-way its | |
912 | prologue, the function's frame probably hasn't been fully | |
913 | setup yet. Try to reconstruct the base address for the stack | |
914 | frame by looking at the stack pointer. For truly "frameless" | |
915 | functions this might work too. */ | |
916 | ||
f36bf22c | 917 | get_frame_register (this_frame, M68K_SP_REGNUM, buf); |
e17a4113 UW |
918 | cache->base = extract_unsigned_integer (buf, 4, byte_order) |
919 | + cache->sp_offset; | |
8de307e0 | 920 | } |
7f8e7424 | 921 | |
8de307e0 AS |
922 | /* Now that we have the base address for the stack frame we can |
923 | calculate the value of %sp in the calling frame. */ | |
924 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 925 | |
8de307e0 AS |
926 | /* Adjust all the saved registers such that they contain addresses |
927 | instead of offsets. */ | |
928 | for (i = 0; i < M68K_NUM_REGS; i++) | |
929 | if (cache->saved_regs[i] != -1) | |
930 | cache->saved_regs[i] += cache->base; | |
c906108c | 931 | |
8de307e0 AS |
932 | return cache; |
933 | } | |
c906108c | 934 | |
8de307e0 | 935 | static void |
f36bf22c | 936 | m68k_frame_this_id (struct frame_info *this_frame, void **this_cache, |
8de307e0 AS |
937 | struct frame_id *this_id) |
938 | { | |
f36bf22c | 939 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
c906108c | 940 | |
8de307e0 AS |
941 | /* This marks the outermost frame. */ |
942 | if (cache->base == 0) | |
943 | return; | |
c5aa993b | 944 | |
8de307e0 AS |
945 | /* See the end of m68k_push_dummy_call. */ |
946 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
947 | } | |
c5aa993b | 948 | |
f36bf22c AS |
949 | static struct value * |
950 | m68k_frame_prev_register (struct frame_info *this_frame, void **this_cache, | |
951 | int regnum) | |
8de307e0 | 952 | { |
f36bf22c | 953 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
954 | |
955 | gdb_assert (regnum >= 0); | |
956 | ||
957 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
f36bf22c | 958 | return frame_unwind_got_constant (this_frame, regnum, cache->saved_sp); |
8de307e0 AS |
959 | |
960 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
f36bf22c AS |
961 | return frame_unwind_got_memory (this_frame, regnum, |
962 | cache->saved_regs[regnum]); | |
8de307e0 | 963 | |
f36bf22c | 964 | return frame_unwind_got_register (this_frame, regnum, regnum); |
8de307e0 AS |
965 | } |
966 | ||
967 | static const struct frame_unwind m68k_frame_unwind = | |
968 | { | |
969 | NORMAL_FRAME, | |
8fbca658 | 970 | default_frame_unwind_stop_reason, |
8de307e0 | 971 | m68k_frame_this_id, |
f36bf22c AS |
972 | m68k_frame_prev_register, |
973 | NULL, | |
974 | default_frame_sniffer | |
8de307e0 | 975 | }; |
8de307e0 | 976 | \f |
8de307e0 | 977 | static CORE_ADDR |
f36bf22c | 978 | m68k_frame_base_address (struct frame_info *this_frame, void **this_cache) |
8de307e0 | 979 | { |
f36bf22c | 980 | struct m68k_frame_cache *cache = m68k_frame_cache (this_frame, this_cache); |
8de307e0 AS |
981 | |
982 | return cache->base; | |
983 | } | |
984 | ||
985 | static const struct frame_base m68k_frame_base = | |
986 | { | |
987 | &m68k_frame_unwind, | |
988 | m68k_frame_base_address, | |
989 | m68k_frame_base_address, | |
990 | m68k_frame_base_address | |
991 | }; | |
992 | ||
993 | static struct frame_id | |
f36bf22c | 994 | m68k_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
8de307e0 | 995 | { |
8de307e0 | 996 | CORE_ADDR fp; |
c906108c | 997 | |
f36bf22c | 998 | fp = get_frame_register_unsigned (this_frame, M68K_FP_REGNUM); |
c906108c | 999 | |
8de307e0 | 1000 | /* See the end of m68k_push_dummy_call. */ |
f36bf22c | 1001 | return frame_id_build (fp + 8, get_frame_pc (this_frame)); |
8de307e0 AS |
1002 | } |
1003 | \f | |
c906108c | 1004 | |
c906108c SS |
1005 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1006 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1007 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
025bb325 | 1008 | This routine returns true on success. */ |
c906108c | 1009 | |
c34d127c | 1010 | static int |
60ade65d | 1011 | m68k_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) |
c906108c | 1012 | { |
f5cf7aa1 | 1013 | gdb_byte *buf; |
c906108c | 1014 | CORE_ADDR sp, jb_addr; |
c984b7ff | 1015 | struct gdbarch *gdbarch = get_frame_arch (frame); |
e17a4113 UW |
1016 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
1017 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
eb2e12d7 AS |
1018 | |
1019 | if (tdep->jb_pc < 0) | |
1020 | { | |
1021 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1022 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1023 | return 0; |
1024 | } | |
c906108c | 1025 | |
224c3ddb | 1026 | buf = (gdb_byte *) alloca (gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT); |
c984b7ff | 1027 | sp = get_frame_register_unsigned (frame, gdbarch_sp_regnum (gdbarch)); |
c906108c | 1028 | |
025bb325 | 1029 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack. */ |
c984b7ff | 1030 | buf, gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT)) |
c906108c SS |
1031 | return 0; |
1032 | ||
c984b7ff | 1033 | jb_addr = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1034 | / TARGET_CHAR_BIT, byte_order); |
c906108c | 1035 | |
eb2e12d7 | 1036 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
e17a4113 UW |
1037 | gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT), |
1038 | byte_order) | |
c906108c SS |
1039 | return 0; |
1040 | ||
c984b7ff | 1041 | *pc = extract_unsigned_integer (buf, gdbarch_ptr_bit (gdbarch) |
e17a4113 | 1042 | / TARGET_CHAR_BIT, byte_order); |
c906108c SS |
1043 | return 1; |
1044 | } | |
f595cb19 MK |
1045 | \f |
1046 | ||
18648a37 YQ |
1047 | /* This is the implementation of gdbarch method |
1048 | return_in_first_hidden_param_p. */ | |
1049 | ||
1050 | static int | |
1051 | m68k_return_in_first_hidden_param_p (struct gdbarch *gdbarch, | |
1052 | struct type *type) | |
1053 | { | |
1054 | return 0; | |
1055 | } | |
1056 | ||
f595cb19 MK |
1057 | /* System V Release 4 (SVR4). */ |
1058 | ||
1059 | void | |
1060 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1061 | { | |
1062 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1063 | ||
1064 | /* SVR4 uses a different calling convention. */ | |
1065 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1066 | ||
1067 | /* SVR4 uses %a0 instead of %a1. */ | |
1068 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1069 | } | |
1070 | \f | |
c906108c | 1071 | |
152d9db6 GS |
1072 | /* Function: m68k_gdbarch_init |
1073 | Initializer function for the m68k gdbarch vector. | |
025bb325 | 1074 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ |
152d9db6 GS |
1075 | |
1076 | static struct gdbarch * | |
1077 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1078 | { | |
1079 | struct gdbarch_tdep *tdep = NULL; | |
1080 | struct gdbarch *gdbarch; | |
8ed86d01 VP |
1081 | struct gdbarch_list *best_arch; |
1082 | struct tdesc_arch_data *tdesc_data = NULL; | |
1083 | int i; | |
1084 | enum m68k_flavour flavour = m68k_no_flavour; | |
1085 | int has_fp = 1; | |
1086 | const struct floatformat **long_double_format = floatformats_m68881_ext; | |
1087 | ||
1088 | /* Check any target description for validity. */ | |
1089 | if (tdesc_has_registers (info.target_desc)) | |
1090 | { | |
1091 | const struct tdesc_feature *feature; | |
1092 | int valid_p; | |
152d9db6 | 1093 | |
8ed86d01 VP |
1094 | feature = tdesc_find_feature (info.target_desc, |
1095 | "org.gnu.gdb.m68k.core"); | |
8ed86d01 VP |
1096 | |
1097 | if (feature == NULL) | |
1098 | { | |
1099 | feature = tdesc_find_feature (info.target_desc, | |
1100 | "org.gnu.gdb.coldfire.core"); | |
1101 | if (feature != NULL) | |
1102 | flavour = m68k_coldfire_flavour; | |
1103 | } | |
1104 | ||
1105 | if (feature == NULL) | |
1106 | { | |
1107 | feature = tdesc_find_feature (info.target_desc, | |
1108 | "org.gnu.gdb.fido.core"); | |
1109 | if (feature != NULL) | |
1110 | flavour = m68k_fido_flavour; | |
1111 | } | |
1112 | ||
1113 | if (feature == NULL) | |
1114 | return NULL; | |
1115 | ||
1116 | tdesc_data = tdesc_data_alloc (); | |
1117 | ||
1118 | valid_p = 1; | |
1119 | for (i = 0; i <= M68K_PC_REGNUM; i++) | |
1120 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1121 | m68k_register_names[i]); | |
1122 | ||
1123 | if (!valid_p) | |
1124 | { | |
1125 | tdesc_data_cleanup (tdesc_data); | |
1126 | return NULL; | |
1127 | } | |
1128 | ||
1129 | feature = tdesc_find_feature (info.target_desc, | |
1130 | "org.gnu.gdb.coldfire.fp"); | |
1131 | if (feature != NULL) | |
1132 | { | |
1133 | valid_p = 1; | |
1134 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
1135 | valid_p &= tdesc_numbered_register (feature, tdesc_data, i, | |
1136 | m68k_register_names[i]); | |
1137 | if (!valid_p) | |
1138 | { | |
1139 | tdesc_data_cleanup (tdesc_data); | |
1140 | return NULL; | |
1141 | } | |
1142 | } | |
1143 | else | |
1144 | has_fp = 0; | |
1145 | } | |
1146 | ||
1147 | /* The mechanism for returning floating values from function | |
1148 | and the type of long double depend on whether we're | |
025bb325 | 1149 | on ColdFire or standard m68k. */ |
8ed86d01 | 1150 | |
4ed77933 | 1151 | if (info.bfd_arch_info && info.bfd_arch_info->mach != 0) |
8ed86d01 VP |
1152 | { |
1153 | const bfd_arch_info_type *coldfire_arch = | |
1154 | bfd_lookup_arch (bfd_arch_m68k, bfd_mach_mcf_isa_a_nodiv); | |
1155 | ||
1156 | if (coldfire_arch | |
4ed77933 AS |
1157 | && ((*info.bfd_arch_info->compatible) |
1158 | (info.bfd_arch_info, coldfire_arch))) | |
8ed86d01 VP |
1159 | flavour = m68k_coldfire_flavour; |
1160 | } | |
1161 | ||
1162 | /* If there is already a candidate, use it. */ | |
1163 | for (best_arch = gdbarch_list_lookup_by_info (arches, &info); | |
1164 | best_arch != NULL; | |
1165 | best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info)) | |
1166 | { | |
1167 | if (flavour != gdbarch_tdep (best_arch->gdbarch)->flavour) | |
1168 | continue; | |
1169 | ||
1170 | if (has_fp != gdbarch_tdep (best_arch->gdbarch)->fpregs_present) | |
1171 | continue; | |
1172 | ||
1173 | break; | |
1174 | } | |
152d9db6 | 1175 | |
0c85e18e MK |
1176 | if (best_arch != NULL) |
1177 | { | |
1178 | if (tdesc_data != NULL) | |
1179 | tdesc_data_cleanup (tdesc_data); | |
1180 | return best_arch->gdbarch; | |
1181 | } | |
1182 | ||
8d749320 | 1183 | tdep = XCNEW (struct gdbarch_tdep); |
eb2e12d7 | 1184 | gdbarch = gdbarch_alloc (&info, tdep); |
8ed86d01 VP |
1185 | tdep->fpregs_present = has_fp; |
1186 | tdep->flavour = flavour; | |
152d9db6 | 1187 | |
8ed86d01 VP |
1188 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1189 | long_double_format = floatformats_ieee_double; | |
1190 | set_gdbarch_long_double_format (gdbarch, long_double_format); | |
1191 | set_gdbarch_long_double_bit (gdbarch, long_double_format[0]->totalsize); | |
5d3ed2e3 | 1192 | |
5d3ed2e3 | 1193 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
04180708 YQ |
1194 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, m68k_breakpoint::kind_from_pc); |
1195 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, m68k_breakpoint::bp_from_kind); | |
5d3ed2e3 | 1196 | |
025bb325 | 1197 | /* Stack grows down. */ |
5d3ed2e3 | 1198 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
9bb47d95 | 1199 | set_gdbarch_frame_align (gdbarch, m68k_frame_align); |
6300c360 GS |
1200 | |
1201 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
8ed86d01 VP |
1202 | if (flavour == m68k_coldfire_flavour || flavour == m68k_fido_flavour) |
1203 | set_gdbarch_decr_pc_after_break (gdbarch, 2); | |
942dc0e9 | 1204 | |
6300c360 | 1205 | set_gdbarch_frame_args_skip (gdbarch, 8); |
6dd0fba6 | 1206 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, m68k_dwarf_reg_to_regnum); |
942dc0e9 | 1207 | |
8de307e0 | 1208 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1209 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
6dd0fba6 | 1210 | set_gdbarch_num_regs (gdbarch, M68K_NUM_REGS); |
32eeb91a | 1211 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1212 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1213 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
e47577ab MK |
1214 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1215 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1216 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1217 | |
8ed86d01 VP |
1218 | if (has_fp) |
1219 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
1220 | ||
1221 | /* Try to figure out if the arch uses floating registers to return | |
1222 | floating point values from functions. */ | |
1223 | if (has_fp) | |
1224 | { | |
1225 | /* On ColdFire, floating point values are returned in D0. */ | |
1226 | if (flavour == m68k_coldfire_flavour) | |
1227 | tdep->float_return = 0; | |
1228 | else | |
1229 | tdep->float_return = 1; | |
1230 | } | |
1231 | else | |
1232 | { | |
1233 | /* No floating registers, so can't use them for returning values. */ | |
1234 | tdep->float_return = 0; | |
1235 | } | |
1236 | ||
025bb325 | 1237 | /* Function call & return. */ |
8de307e0 | 1238 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1239 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
18648a37 YQ |
1240 | set_gdbarch_return_in_first_hidden_param_p (gdbarch, |
1241 | m68k_return_in_first_hidden_param_p); | |
6c0e89ed | 1242 | |
8ed86d01 | 1243 | |
650fcc91 AS |
1244 | /* Disassembler. */ |
1245 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1246 | ||
eb2e12d7 AS |
1247 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1248 | tdep->jb_pc = JB_PC; | |
1249 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1250 | #else | |
1251 | tdep->jb_pc = -1; | |
1252 | #endif | |
f595cb19 | 1253 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1254 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1255 | |
1256 | /* Frame unwinder. */ | |
f36bf22c | 1257 | set_gdbarch_dummy_id (gdbarch, m68k_dummy_id); |
8de307e0 | 1258 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); |
3f244638 AS |
1259 | |
1260 | /* Hook in the DWARF CFI frame unwinder. */ | |
f36bf22c | 1261 | dwarf2_append_unwinders (gdbarch); |
3f244638 | 1262 | |
8de307e0 | 1263 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1264 | |
55809acb AS |
1265 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1266 | gdbarch_init_osabi (info, gdbarch); | |
1267 | ||
eb2e12d7 AS |
1268 | /* Now we have tuned the configuration, set a few final things, |
1269 | based on what the OS ABI has told us. */ | |
1270 | ||
1271 | if (tdep->jb_pc >= 0) | |
1272 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1273 | ||
f36bf22c | 1274 | frame_unwind_append_unwinder (gdbarch, &m68k_frame_unwind); |
8de307e0 | 1275 | |
8ed86d01 | 1276 | if (tdesc_data) |
7cc46491 | 1277 | tdesc_use_registers (gdbarch, info.target_desc, tdesc_data); |
8ed86d01 | 1278 | |
152d9db6 GS |
1279 | return gdbarch; |
1280 | } | |
1281 | ||
1282 | ||
1283 | static void | |
c984b7ff | 1284 | m68k_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
152d9db6 | 1285 | { |
c984b7ff | 1286 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
152d9db6 | 1287 | |
eb2e12d7 AS |
1288 | if (tdep == NULL) |
1289 | return; | |
152d9db6 | 1290 | } |
2acceee2 | 1291 | |
a78f21af AC |
1292 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1293 | ||
c906108c | 1294 | void |
fba45db2 | 1295 | _initialize_m68k_tdep (void) |
c906108c | 1296 | { |
152d9db6 | 1297 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1298 | } |