Commit | Line | Data |
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748894bf | 1 | /* Target-dependent code for the Motorola 68000 series. |
c6f0559b AC |
2 | |
3 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1999, 2000, | |
4754a64e | 4 | 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
3f244638 | 24 | #include "dwarf2-frame.h" |
c906108c | 25 | #include "frame.h" |
8de307e0 AS |
26 | #include "frame-base.h" |
27 | #include "frame-unwind.h" | |
f595cb19 | 28 | #include "floatformat.h" |
c906108c SS |
29 | #include "symtab.h" |
30 | #include "gdbcore.h" | |
31 | #include "value.h" | |
32 | #include "gdb_string.h" | |
8de307e0 | 33 | #include "gdb_assert.h" |
7a292a7a | 34 | #include "inferior.h" |
4e052eda | 35 | #include "regcache.h" |
5d3ed2e3 | 36 | #include "arch-utils.h" |
55809acb | 37 | #include "osabi.h" |
a89aa300 | 38 | #include "dis-asm.h" |
32eeb91a AS |
39 | |
40 | #include "m68k-tdep.h" | |
c906108c | 41 | \f |
c5aa993b | 42 | |
89c3b6d3 PDM |
43 | #define P_LINKL_FP 0x480e |
44 | #define P_LINKW_FP 0x4e56 | |
45 | #define P_PEA_FP 0x4856 | |
8de307e0 AS |
46 | #define P_MOVEAL_SP_FP 0x2c4f |
47 | #define P_ADDAW_SP 0xdefc | |
48 | #define P_ADDAL_SP 0xdffc | |
49 | #define P_SUBQW_SP 0x514f | |
50 | #define P_SUBQL_SP 0x518f | |
51 | #define P_LEA_SP_SP 0x4fef | |
52 | #define P_LEA_PC_A5 0x4bfb0170 | |
53 | #define P_FMOVEMX_SP 0xf227 | |
54 | #define P_MOVEL_SP 0x2f00 | |
55 | #define P_MOVEML_SP 0x48e7 | |
89c3b6d3 | 56 | |
103a1597 | 57 | |
103a1597 GS |
58 | #define REGISTER_BYTES_FP (16*4 + 8 + 8*12 + 3*4) |
59 | #define REGISTER_BYTES_NOFP (16*4 + 8) | |
60 | ||
103a1597 | 61 | /* Offset from SP to first arg on stack at first instruction of a function */ |
103a1597 GS |
62 | #define SP_ARG0 (1 * 4) |
63 | ||
103a1597 GS |
64 | #if !defined (BPT_VECTOR) |
65 | #define BPT_VECTOR 0xf | |
66 | #endif | |
67 | ||
f5cf7aa1 | 68 | static const gdb_byte * |
103a1597 GS |
69 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
70 | { | |
f5cf7aa1 | 71 | static gdb_byte break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; |
103a1597 GS |
72 | *lenptr = sizeof (break_insn); |
73 | return break_insn; | |
74 | } | |
75 | ||
76 | ||
942dc0e9 | 77 | static int |
5ae5f592 | 78 | m68k_register_bytes_ok (long numbytes) |
942dc0e9 GS |
79 | { |
80 | return ((numbytes == REGISTER_BYTES_FP) | |
81 | || (numbytes == REGISTER_BYTES_NOFP)); | |
82 | } | |
83 | ||
d85fe7f7 AS |
84 | /* Return the GDB type object for the "standard" data type of data in |
85 | register N. This should be int for D0-D7, SR, FPCONTROL and | |
86 | FPSTATUS, long double for FP0-FP7, and void pointer for all others | |
87 | (A0-A7, PC, FPIADDR). Note, for registers which contain | |
88 | addresses return pointer to void, not pointer to char, because we | |
89 | don't want to attempt to print the string after printing the | |
90 | address. */ | |
5d3ed2e3 GS |
91 | |
92 | static struct type * | |
8de307e0 | 93 | m68k_register_type (struct gdbarch *gdbarch, int regnum) |
5d3ed2e3 | 94 | { |
03dac896 AS |
95 | if (regnum >= FP0_REGNUM && regnum <= FP0_REGNUM + 7) |
96 | return builtin_type_m68881_ext; | |
97 | ||
32eeb91a | 98 | if (regnum == M68K_FPI_REGNUM || regnum == PC_REGNUM) |
03dac896 AS |
99 | return builtin_type_void_func_ptr; |
100 | ||
32eeb91a AS |
101 | if (regnum == M68K_FPC_REGNUM || regnum == M68K_FPS_REGNUM |
102 | || regnum == PS_REGNUM) | |
03dac896 AS |
103 | return builtin_type_int32; |
104 | ||
32eeb91a | 105 | if (regnum >= M68K_A0_REGNUM && regnum <= M68K_A0_REGNUM + 7) |
03dac896 AS |
106 | return builtin_type_void_data_ptr; |
107 | ||
108 | return builtin_type_int32; | |
5d3ed2e3 GS |
109 | } |
110 | ||
111 | /* Function: m68k_register_name | |
112 | Returns the name of the standard m68k register regnum. */ | |
113 | ||
114 | static const char * | |
115 | m68k_register_name (int regnum) | |
116 | { | |
117 | static char *register_names[] = { | |
118 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", | |
119 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", | |
120 | "ps", "pc", | |
121 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", | |
122 | "fpcontrol", "fpstatus", "fpiaddr", "fpcode", "fpflags" | |
123 | }; | |
124 | ||
125 | if (regnum < 0 || | |
126 | regnum >= sizeof (register_names) / sizeof (register_names[0])) | |
127 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 128 | _("m68k_register_name: illegal register number %d"), regnum); |
5d3ed2e3 GS |
129 | else |
130 | return register_names[regnum]; | |
131 | } | |
e47577ab MK |
132 | \f |
133 | /* Return nonzero if a value of type TYPE stored in register REGNUM | |
134 | needs any special handling. */ | |
135 | ||
136 | static int | |
137 | m68k_convert_register_p (int regnum, struct type *type) | |
138 | { | |
139 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FP0_REGNUM + 7); | |
140 | } | |
141 | ||
142 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
143 | return its contents in TO. */ | |
144 | ||
145 | static void | |
146 | m68k_register_to_value (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 147 | struct type *type, gdb_byte *to) |
e47577ab | 148 | { |
f5cf7aa1 | 149 | gdb_byte from[M68K_MAX_REGISTER_SIZE]; |
e47577ab MK |
150 | |
151 | /* We only support floating-point values. */ | |
152 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
153 | { | |
8a3fe4f8 AC |
154 | warning (_("Cannot convert floating-point register value " |
155 | "to non-floating-point type.")); | |
e47577ab MK |
156 | return; |
157 | } | |
158 | ||
159 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to | |
160 | the extended floating-point format used by the FPU. */ | |
161 | get_frame_register (frame, regnum, from); | |
162 | convert_typed_floating (from, builtin_type_m68881_ext, to, type); | |
163 | } | |
164 | ||
165 | /* Write the contents FROM of a value of type TYPE into register | |
166 | REGNUM in frame FRAME. */ | |
167 | ||
168 | static void | |
169 | m68k_value_to_register (struct frame_info *frame, int regnum, | |
f5cf7aa1 | 170 | struct type *type, const gdb_byte *from) |
e47577ab | 171 | { |
f5cf7aa1 | 172 | gdb_byte to[M68K_MAX_REGISTER_SIZE]; |
e47577ab MK |
173 | |
174 | /* We only support floating-point values. */ | |
175 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
176 | { | |
8a3fe4f8 AC |
177 | warning (_("Cannot convert non-floating-point type " |
178 | "to floating-point register value.")); | |
e47577ab MK |
179 | return; |
180 | } | |
181 | ||
182 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent | |
183 | to the extended floating-point format used by the FPU. */ | |
184 | convert_typed_floating (from, type, to, builtin_type_m68881_ext); | |
185 | put_frame_register (frame, regnum, to); | |
186 | } | |
187 | ||
8de307e0 | 188 | \f |
f595cb19 MK |
189 | /* There is a fair number of calling conventions that are in somewhat |
190 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
191 | coprocessor. All function return values are stored in %d0/%d1. | |
192 | Structures are returned in a static buffer, a pointer to which is | |
193 | returned in %d0. This means that functions returning a structure | |
194 | are not re-entrant. To avoid this problem some systems use a | |
195 | convention where the caller passes a pointer to a buffer in %a1 | |
196 | where the return values is to be stored. This convention is the | |
197 | default, and is implemented in the function m68k_return_value. | |
198 | ||
199 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
200 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
201 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
202 | psABI. Integer values are returned in %d0/%d1, pointer return | |
203 | values in %a0 and floating values in %fp0. When calling functions | |
204 | returning a structure the caller should pass a pointer to a buffer | |
205 | for the return value in %a0. This convention is implemented in the | |
206 | function m68k_svr4_return_value, and by appropriately setting the | |
207 | struct_value_regnum member of `struct gdbarch_tdep'. | |
208 | ||
209 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
210 | for passing the structure return value buffer. | |
211 | ||
212 | GCC can also generate code where small structures are returned in | |
213 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
214 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
215 | embedded systems. This convention is implemented by setting the | |
216 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
217 | ||
218 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 219 | into VALBUF. */ |
942dc0e9 GS |
220 | |
221 | static void | |
8de307e0 | 222 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 223 | gdb_byte *valbuf) |
942dc0e9 | 224 | { |
8de307e0 | 225 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 226 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 227 | |
8de307e0 AS |
228 | if (len <= 4) |
229 | { | |
230 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
231 | memcpy (valbuf, buf + (4 - len), len); | |
232 | } | |
233 | else if (len <= 8) | |
234 | { | |
235 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
236 | memcpy (valbuf, buf + (8 - len), len - 4); | |
f5cf7aa1 | 237 | regcache_raw_read (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
238 | } |
239 | else | |
240 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 241 | _("Cannot extract return value of %d bytes long."), len); |
942dc0e9 GS |
242 | } |
243 | ||
942dc0e9 | 244 | static void |
f595cb19 | 245 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
f5cf7aa1 | 246 | gdb_byte *valbuf) |
942dc0e9 | 247 | { |
8de307e0 | 248 | int len = TYPE_LENGTH (type); |
f5cf7aa1 | 249 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 250 | |
f595cb19 | 251 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 252 | { |
f595cb19 MK |
253 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
254 | convert_typed_floating (buf, builtin_type_m68881_ext, valbuf, type); | |
8de307e0 | 255 | } |
f595cb19 MK |
256 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
257 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
258 | else | |
259 | m68k_extract_return_value (type, regcache, valbuf); | |
260 | } | |
261 | ||
262 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
263 | ||
264 | static void | |
265 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 266 | const gdb_byte *valbuf) |
f595cb19 MK |
267 | { |
268 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 269 | |
8de307e0 AS |
270 | if (len <= 4) |
271 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
272 | else if (len <= 8) | |
273 | { | |
f595cb19 | 274 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 275 | len - 4, valbuf); |
f5cf7aa1 | 276 | regcache_raw_write (regcache, M68K_D1_REGNUM, valbuf + (len - 4)); |
8de307e0 AS |
277 | } |
278 | else | |
279 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 280 | _("Cannot store return value of %d bytes long."), len); |
8de307e0 | 281 | } |
942dc0e9 | 282 | |
f595cb19 MK |
283 | static void |
284 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
f5cf7aa1 | 285 | const gdb_byte *valbuf) |
942dc0e9 | 286 | { |
f595cb19 | 287 | int len = TYPE_LENGTH (type); |
8de307e0 | 288 | |
f595cb19 MK |
289 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
290 | { | |
f5cf7aa1 | 291 | gdb_byte buf[M68K_MAX_REGISTER_SIZE]; |
f595cb19 MK |
292 | convert_typed_floating (valbuf, type, buf, builtin_type_m68881_ext); |
293 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); | |
294 | } | |
295 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
296 | { | |
297 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
298 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
299 | } | |
300 | else | |
301 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
302 | } |
303 | ||
f595cb19 MK |
304 | /* Return non-zero if TYPE, which is assumed to be a structure or |
305 | union type, should be returned in registers for architecture | |
306 | GDBARCH. */ | |
307 | ||
c481dac7 | 308 | static int |
f595cb19 | 309 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 310 | { |
f595cb19 MK |
311 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
312 | enum type_code code = TYPE_CODE (type); | |
313 | int len = TYPE_LENGTH (type); | |
c481dac7 | 314 | |
f595cb19 MK |
315 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
316 | ||
317 | if (tdep->struct_return == pcc_struct_return) | |
318 | return 0; | |
319 | ||
320 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
321 | } |
322 | ||
f595cb19 MK |
323 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
324 | should be returned. If it is supposed to be returned in registers, | |
325 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
326 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
327 | from WRITEBUF into REGCACHE. */ | |
328 | ||
329 | static enum return_value_convention | |
330 | m68k_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
331 | struct regcache *regcache, gdb_byte *readbuf, |
332 | const gdb_byte *writebuf) | |
f595cb19 MK |
333 | { |
334 | enum type_code code = TYPE_CODE (type); | |
335 | ||
336 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
337 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
338 | return RETURN_VALUE_STRUCT_CONVENTION; | |
339 | ||
340 | /* GCC returns a `long double' in memory. */ | |
341 | if (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12) | |
342 | return RETURN_VALUE_STRUCT_CONVENTION; | |
343 | ||
344 | if (readbuf) | |
345 | m68k_extract_return_value (type, regcache, readbuf); | |
346 | if (writebuf) | |
347 | m68k_store_return_value (type, regcache, writebuf); | |
348 | ||
349 | return RETURN_VALUE_REGISTER_CONVENTION; | |
350 | } | |
351 | ||
352 | static enum return_value_convention | |
353 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *type, | |
f5cf7aa1 MK |
354 | struct regcache *regcache, gdb_byte *readbuf, |
355 | const gdb_byte *writebuf) | |
f595cb19 MK |
356 | { |
357 | enum type_code code = TYPE_CODE (type); | |
358 | ||
359 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
360 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
51da707a MK |
361 | { |
362 | /* The System V ABI says that: | |
363 | ||
364 | "A function returning a structure or union also sets %a0 to | |
365 | the value it finds in %a0. Thus when the caller receives | |
366 | control again, the address of the returned object resides in | |
367 | register %a0." | |
368 | ||
369 | So the ABI guarantees that we can always find the return | |
370 | value just after the function has returned. */ | |
371 | ||
372 | if (readbuf) | |
373 | { | |
374 | ULONGEST addr; | |
375 | ||
376 | regcache_raw_read_unsigned (regcache, M68K_A0_REGNUM, &addr); | |
377 | read_memory (addr, readbuf, TYPE_LENGTH (type)); | |
378 | } | |
379 | ||
380 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
381 | } | |
f595cb19 MK |
382 | |
383 | /* This special case is for structures consisting of a single | |
384 | `float' or `double' member. These structures are returned in | |
385 | %fp0. For these structures, we call ourselves recursively, | |
386 | changing TYPE into the type of the first member of the structure. | |
387 | Since that should work for all structures that have only one | |
388 | member, we don't bother to check the member's type here. */ | |
389 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
390 | { | |
391 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
392 | return m68k_svr4_return_value (gdbarch, type, regcache, | |
393 | readbuf, writebuf); | |
394 | } | |
395 | ||
396 | if (readbuf) | |
397 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
398 | if (writebuf) | |
399 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
400 | ||
401 | return RETURN_VALUE_REGISTER_CONVENTION; | |
402 | } | |
403 | \f | |
392a587b | 404 | |
8de307e0 | 405 | static CORE_ADDR |
7d9b040b | 406 | m68k_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
8de307e0 AS |
407 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, |
408 | struct value **args, CORE_ADDR sp, int struct_return, | |
409 | CORE_ADDR struct_addr) | |
7f8e7424 | 410 | { |
f595cb19 | 411 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
f5cf7aa1 | 412 | gdb_byte buf[4]; |
8de307e0 AS |
413 | int i; |
414 | ||
415 | /* Push arguments in reverse order. */ | |
416 | for (i = nargs - 1; i >= 0; i--) | |
417 | { | |
4754a64e | 418 | struct type *value_type = value_enclosing_type (args[i]); |
c481dac7 | 419 | int len = TYPE_LENGTH (value_type); |
8de307e0 | 420 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
421 | int offset; |
422 | ||
423 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
424 | right aligned. */ | |
425 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
426 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
427 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
428 | && len > 4) | |
429 | offset = 0; | |
430 | else | |
431 | offset = container_len - len; | |
8de307e0 | 432 | sp -= container_len; |
46615f07 | 433 | write_memory (sp + offset, value_contents_all (args[i]), len); |
8de307e0 AS |
434 | } |
435 | ||
c481dac7 | 436 | /* Store struct value address. */ |
8de307e0 AS |
437 | if (struct_return) |
438 | { | |
8de307e0 | 439 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 440 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
441 | } |
442 | ||
443 | /* Store return address. */ | |
444 | sp -= 4; | |
445 | store_unsigned_integer (buf, 4, bp_addr); | |
446 | write_memory (sp, buf, 4); | |
447 | ||
448 | /* Finally, update the stack pointer... */ | |
449 | store_unsigned_integer (buf, 4, sp); | |
450 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
451 | ||
452 | /* ...and fake a frame pointer. */ | |
453 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
454 | ||
455 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
456 | frame's CFA. */ | |
457 | return sp + 8; | |
7f8e7424 | 458 | } |
8de307e0 AS |
459 | \f |
460 | struct m68k_frame_cache | |
461 | { | |
462 | /* Base address. */ | |
463 | CORE_ADDR base; | |
464 | CORE_ADDR sp_offset; | |
465 | CORE_ADDR pc; | |
7f8e7424 | 466 | |
8de307e0 AS |
467 | /* Saved registers. */ |
468 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
469 | CORE_ADDR saved_sp; | |
7f8e7424 | 470 | |
8de307e0 AS |
471 | /* Stack space reserved for local variables. */ |
472 | long locals; | |
473 | }; | |
c906108c | 474 | |
8de307e0 AS |
475 | /* Allocate and initialize a frame cache. */ |
476 | ||
477 | static struct m68k_frame_cache * | |
478 | m68k_alloc_frame_cache (void) | |
c906108c | 479 | { |
8de307e0 AS |
480 | struct m68k_frame_cache *cache; |
481 | int i; | |
c906108c | 482 | |
8de307e0 | 483 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 484 | |
8de307e0 AS |
485 | /* Base address. */ |
486 | cache->base = 0; | |
487 | cache->sp_offset = -4; | |
488 | cache->pc = 0; | |
c906108c | 489 | |
8de307e0 AS |
490 | /* Saved registers. We initialize these to -1 since zero is a valid |
491 | offset (that's where %fp is supposed to be stored). */ | |
492 | for (i = 0; i < M68K_NUM_REGS; i++) | |
493 | cache->saved_regs[i] = -1; | |
494 | ||
495 | /* Frameless until proven otherwise. */ | |
496 | cache->locals = -1; | |
497 | ||
498 | return cache; | |
c906108c SS |
499 | } |
500 | ||
8de307e0 AS |
501 | /* Check whether PC points at a code that sets up a new stack frame. |
502 | If so, it updates CACHE and returns the address of the first | |
503 | instruction after the sequence that sets removes the "hidden" | |
504 | argument from the stack or CURRENT_PC, whichever is smaller. | |
505 | Otherwise, return PC. */ | |
c906108c | 506 | |
8de307e0 AS |
507 | static CORE_ADDR |
508 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
509 | struct m68k_frame_cache *cache) | |
c906108c | 510 | { |
8de307e0 AS |
511 | int op; |
512 | ||
513 | if (pc >= current_pc) | |
514 | return current_pc; | |
c906108c | 515 | |
8de307e0 AS |
516 | op = read_memory_unsigned_integer (pc, 2); |
517 | ||
518 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 519 | { |
8de307e0 AS |
520 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
521 | cache->sp_offset += 4; | |
522 | if (op == P_LINKW_FP) | |
523 | { | |
524 | /* link.w %fp, #-N */ | |
525 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
526 | cache->locals = -read_memory_integer (pc + 2, 2); | |
527 | ||
528 | if (pc + 4 < current_pc && cache->locals == 0) | |
529 | { | |
530 | op = read_memory_unsigned_integer (pc + 4, 2); | |
531 | if (op == P_ADDAL_SP) | |
532 | { | |
533 | cache->locals = read_memory_integer (pc + 6, 4); | |
534 | return pc + 10; | |
535 | } | |
536 | } | |
537 | ||
538 | return pc + 4; | |
539 | } | |
540 | else if (op == P_LINKL_FP) | |
c906108c | 541 | { |
8de307e0 AS |
542 | /* link.l %fp, #-N */ |
543 | cache->locals = -read_memory_integer (pc + 2, 4); | |
544 | return pc + 6; | |
545 | } | |
546 | else | |
547 | { | |
548 | /* pea (%fp); movea.l %sp, %fp */ | |
549 | cache->locals = 0; | |
550 | ||
551 | if (pc + 2 < current_pc) | |
552 | { | |
553 | op = read_memory_unsigned_integer (pc + 2, 2); | |
554 | ||
555 | if (op == P_MOVEAL_SP_FP) | |
556 | { | |
557 | /* move.l %sp, %fp */ | |
558 | return pc + 4; | |
559 | } | |
560 | } | |
561 | ||
562 | return pc + 2; | |
c906108c SS |
563 | } |
564 | } | |
8de307e0 | 565 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 566 | { |
8de307e0 AS |
567 | /* subq.[wl] #N,%sp */ |
568 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
569 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
570 | if (pc + 2 < current_pc) | |
c906108c | 571 | { |
8de307e0 AS |
572 | op = read_memory_unsigned_integer (pc + 2, 2); |
573 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
574 | { | |
575 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
576 | return pc + 4; | |
577 | } | |
c906108c | 578 | } |
8de307e0 AS |
579 | return pc + 2; |
580 | } | |
581 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
582 | { | |
583 | /* adda.w #-N,%sp */ | |
584 | /* lea (-N,%sp),%sp */ | |
585 | cache->locals = -read_memory_integer (pc + 2, 2); | |
586 | return pc + 4; | |
c906108c | 587 | } |
8de307e0 | 588 | else if (op == P_ADDAL_SP) |
c906108c | 589 | { |
8de307e0 AS |
590 | /* adda.l #-N,%sp */ |
591 | cache->locals = -read_memory_integer (pc + 2, 4); | |
592 | return pc + 6; | |
c906108c | 593 | } |
8de307e0 AS |
594 | |
595 | return pc; | |
c906108c | 596 | } |
c5aa993b | 597 | |
8de307e0 AS |
598 | /* Check whether PC points at code that saves registers on the stack. |
599 | If so, it updates CACHE and returns the address of the first | |
600 | instruction after the register saves or CURRENT_PC, whichever is | |
601 | smaller. Otherwise, return PC. */ | |
c906108c | 602 | |
8de307e0 AS |
603 | static CORE_ADDR |
604 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
605 | struct m68k_frame_cache *cache) | |
606 | { | |
607 | if (cache->locals >= 0) | |
608 | { | |
609 | CORE_ADDR offset; | |
610 | int op; | |
611 | int i, mask, regno; | |
c906108c | 612 | |
8de307e0 AS |
613 | offset = -4 - cache->locals; |
614 | while (pc < current_pc) | |
615 | { | |
616 | op = read_memory_unsigned_integer (pc, 2); | |
617 | if (op == P_FMOVEMX_SP) | |
618 | { | |
619 | /* fmovem.x REGS,-(%sp) */ | |
620 | op = read_memory_unsigned_integer (pc + 2, 2); | |
621 | if ((op & 0xff00) == 0xe000) | |
622 | { | |
623 | mask = op & 0xff; | |
624 | for (i = 0; i < 16; i++, mask >>= 1) | |
625 | { | |
626 | if (mask & 1) | |
627 | { | |
628 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
629 | offset -= 12; | |
630 | } | |
631 | } | |
632 | pc += 4; | |
633 | } | |
634 | else | |
635 | break; | |
636 | } | |
637 | else if ((op & 0170677) == P_MOVEL_SP) | |
638 | { | |
639 | /* move.l %R,-(%sp) */ | |
640 | regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); | |
641 | cache->saved_regs[regno] = offset; | |
642 | offset -= 4; | |
643 | pc += 2; | |
644 | } | |
645 | else if (op == P_MOVEML_SP) | |
646 | { | |
647 | /* movem.l REGS,-(%sp) */ | |
648 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
649 | for (i = 0; i < 16; i++, mask >>= 1) | |
650 | { | |
651 | if (mask & 1) | |
652 | { | |
653 | cache->saved_regs[15 - i] = offset; | |
654 | offset -= 4; | |
655 | } | |
656 | } | |
657 | pc += 4; | |
658 | } | |
659 | else | |
660 | break; | |
661 | } | |
662 | } | |
663 | ||
664 | return pc; | |
665 | } | |
c906108c | 666 | |
c906108c | 667 | |
8de307e0 AS |
668 | /* Do a full analysis of the prologue at PC and update CACHE |
669 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
670 | address where the analysis stopped. | |
c906108c | 671 | |
8de307e0 | 672 | We handle all cases that can be generated by gcc. |
c906108c | 673 | |
8de307e0 | 674 | For allocating a stack frame: |
c906108c | 675 | |
8de307e0 AS |
676 | link.w %a6,#-N |
677 | link.l %a6,#-N | |
678 | pea (%fp); move.l %sp,%fp | |
679 | link.w %a6,#0; add.l #-N,%sp | |
680 | subq.l #N,%sp | |
681 | subq.w #N,%sp | |
682 | subq.w #8,%sp; subq.w #N-8,%sp | |
683 | add.w #-N,%sp | |
684 | lea (-N,%sp),%sp | |
685 | add.l #-N,%sp | |
c906108c | 686 | |
8de307e0 | 687 | For saving registers: |
c906108c | 688 | |
8de307e0 AS |
689 | fmovem.x REGS,-(%sp) |
690 | move.l R1,-(%sp) | |
691 | move.l R1,-(%sp); move.l R2,-(%sp) | |
692 | movem.l REGS,-(%sp) | |
c906108c | 693 | |
8de307e0 | 694 | For setting up the PIC register: |
c906108c | 695 | |
8de307e0 | 696 | lea (%pc,N),%a5 |
c906108c | 697 | |
8de307e0 | 698 | */ |
c906108c | 699 | |
eb2e12d7 | 700 | static CORE_ADDR |
8de307e0 AS |
701 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
702 | struct m68k_frame_cache *cache) | |
c906108c | 703 | { |
8de307e0 | 704 | unsigned int op; |
c906108c | 705 | |
8de307e0 AS |
706 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
707 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
708 | if (pc >= current_pc) | |
709 | return current_pc; | |
c906108c | 710 | |
8de307e0 AS |
711 | /* Check for GOT setup. */ |
712 | op = read_memory_unsigned_integer (pc, 4); | |
713 | if (op == P_LEA_PC_A5) | |
c906108c | 714 | { |
8de307e0 AS |
715 | /* lea (%pc,N),%a5 */ |
716 | return pc + 6; | |
c906108c | 717 | } |
8de307e0 AS |
718 | |
719 | return pc; | |
c906108c SS |
720 | } |
721 | ||
8de307e0 | 722 | /* Return PC of first real instruction. */ |
7f8e7424 | 723 | |
8de307e0 AS |
724 | static CORE_ADDR |
725 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 726 | { |
8de307e0 AS |
727 | struct m68k_frame_cache cache; |
728 | CORE_ADDR pc; | |
729 | int op; | |
c906108c | 730 | |
8de307e0 AS |
731 | cache.locals = -1; |
732 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
733 | if (cache.locals < 0) | |
734 | return start_pc; | |
735 | return pc; | |
736 | } | |
c906108c | 737 | |
8de307e0 AS |
738 | static CORE_ADDR |
739 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
740 | { | |
f5cf7aa1 | 741 | gdb_byte buf[8]; |
7f8e7424 | 742 | |
8de307e0 AS |
743 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
744 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
745 | } | |
746 | \f | |
747 | /* Normal frames. */ | |
7f8e7424 | 748 | |
8de307e0 AS |
749 | static struct m68k_frame_cache * |
750 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
751 | { | |
752 | struct m68k_frame_cache *cache; | |
f5cf7aa1 | 753 | gdb_byte buf[4]; |
8de307e0 AS |
754 | int i; |
755 | ||
756 | if (*this_cache) | |
757 | return *this_cache; | |
758 | ||
759 | cache = m68k_alloc_frame_cache (); | |
760 | *this_cache = cache; | |
761 | ||
762 | /* In principle, for normal frames, %fp holds the frame pointer, | |
763 | which holds the base address for the current stack frame. | |
764 | However, for functions that don't need it, the frame pointer is | |
765 | optional. For these "frameless" functions the frame pointer is | |
766 | actually the frame pointer of the calling frame. Signal | |
767 | trampolines are just a special case of a "frameless" function. | |
768 | They (usually) share their frame pointer with the frame that was | |
769 | in progress when the signal occurred. */ | |
770 | ||
771 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
772 | cache->base = extract_unsigned_integer (buf, 4); | |
773 | if (cache->base == 0) | |
774 | return cache; | |
775 | ||
776 | /* For normal frames, %pc is stored at 4(%fp). */ | |
777 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
778 | ||
779 | cache->pc = frame_func_unwind (next_frame); | |
780 | if (cache->pc != 0) | |
781 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
782 | ||
783 | if (cache->locals < 0) | |
784 | { | |
785 | /* We didn't find a valid frame, which means that CACHE->base | |
786 | currently holds the frame pointer for our calling frame. If | |
787 | we're at the start of a function, or somewhere half-way its | |
788 | prologue, the function's frame probably hasn't been fully | |
789 | setup yet. Try to reconstruct the base address for the stack | |
790 | frame by looking at the stack pointer. For truly "frameless" | |
791 | functions this might work too. */ | |
792 | ||
793 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
794 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
795 | } | |
7f8e7424 | 796 | |
8de307e0 AS |
797 | /* Now that we have the base address for the stack frame we can |
798 | calculate the value of %sp in the calling frame. */ | |
799 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 800 | |
8de307e0 AS |
801 | /* Adjust all the saved registers such that they contain addresses |
802 | instead of offsets. */ | |
803 | for (i = 0; i < M68K_NUM_REGS; i++) | |
804 | if (cache->saved_regs[i] != -1) | |
805 | cache->saved_regs[i] += cache->base; | |
c906108c | 806 | |
8de307e0 AS |
807 | return cache; |
808 | } | |
c906108c | 809 | |
8de307e0 AS |
810 | static void |
811 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
812 | struct frame_id *this_id) | |
813 | { | |
814 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 815 | |
8de307e0 AS |
816 | /* This marks the outermost frame. */ |
817 | if (cache->base == 0) | |
818 | return; | |
c5aa993b | 819 | |
8de307e0 AS |
820 | /* See the end of m68k_push_dummy_call. */ |
821 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
822 | } | |
c5aa993b | 823 | |
8de307e0 AS |
824 | static void |
825 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
826 | int regnum, int *optimizedp, | |
827 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
60b04da5 | 828 | int *realnump, gdb_byte *valuep) |
8de307e0 AS |
829 | { |
830 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
831 | ||
832 | gdb_assert (regnum >= 0); | |
833 | ||
834 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 835 | { |
8de307e0 AS |
836 | *optimizedp = 0; |
837 | *lvalp = not_lval; | |
838 | *addrp = 0; | |
839 | *realnump = -1; | |
840 | if (valuep) | |
c906108c | 841 | { |
8de307e0 AS |
842 | /* Store the value. */ |
843 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 844 | } |
8de307e0 AS |
845 | return; |
846 | } | |
847 | ||
848 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
849 | { | |
850 | *optimizedp = 0; | |
851 | *lvalp = lval_memory; | |
852 | *addrp = cache->saved_regs[regnum]; | |
853 | *realnump = -1; | |
854 | if (valuep) | |
89c3b6d3 | 855 | { |
8de307e0 AS |
856 | /* Read the value in from memory. */ |
857 | read_memory (*addrp, valuep, | |
858 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 859 | } |
8de307e0 | 860 | return; |
c906108c | 861 | } |
8de307e0 | 862 | |
00b25ff3 AC |
863 | *optimizedp = 0; |
864 | *lvalp = lval_register; | |
865 | *addrp = 0; | |
866 | *realnump = regnum; | |
867 | if (valuep) | |
868 | frame_unwind_register (next_frame, (*realnump), valuep); | |
8de307e0 AS |
869 | } |
870 | ||
871 | static const struct frame_unwind m68k_frame_unwind = | |
872 | { | |
873 | NORMAL_FRAME, | |
874 | m68k_frame_this_id, | |
875 | m68k_frame_prev_register | |
876 | }; | |
877 | ||
878 | static const struct frame_unwind * | |
336d1bba | 879 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
880 | { |
881 | return &m68k_frame_unwind; | |
882 | } | |
883 | \f | |
8de307e0 AS |
884 | static CORE_ADDR |
885 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
886 | { | |
887 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
888 | ||
889 | return cache->base; | |
890 | } | |
891 | ||
892 | static const struct frame_base m68k_frame_base = | |
893 | { | |
894 | &m68k_frame_unwind, | |
895 | m68k_frame_base_address, | |
896 | m68k_frame_base_address, | |
897 | m68k_frame_base_address | |
898 | }; | |
899 | ||
900 | static struct frame_id | |
901 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
902 | { | |
f5cf7aa1 | 903 | gdb_byte buf[4]; |
8de307e0 | 904 | CORE_ADDR fp; |
c906108c | 905 | |
8de307e0 AS |
906 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
907 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 908 | |
8de307e0 AS |
909 | /* See the end of m68k_push_dummy_call. */ |
910 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
911 | } | |
912 | \f | |
c5aa993b | 913 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
914 | |
915 | #include <sys/procfs.h> | |
916 | ||
c60c0f5f MS |
917 | /* Prototypes for supply_gregset etc. */ |
918 | #include "gregset.h" | |
919 | ||
c906108c | 920 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
921 | two different sets, the general register set (gregset) and the floating |
922 | point register set (fpregset). For each set, there is an ioctl to get | |
923 | the current register set and another ioctl to set the current values. | |
c906108c | 924 | |
c5aa993b JM |
925 | The actual structure passed through the ioctl interface is, of course, |
926 | naturally machine dependent, and is different for each set of registers. | |
927 | For the m68k for example, the general register set is typically defined | |
928 | by: | |
c906108c | 929 | |
c5aa993b | 930 | typedef int gregset_t[18]; |
c906108c | 931 | |
c5aa993b JM |
932 | #define R_D0 0 |
933 | ... | |
934 | #define R_PS 17 | |
c906108c | 935 | |
c5aa993b | 936 | and the floating point set by: |
c906108c | 937 | |
c5aa993b JM |
938 | typedef struct fpregset { |
939 | int f_pcr; | |
940 | int f_psr; | |
941 | int f_fpiaddr; | |
942 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
943 | } fpregset_t; | |
c906108c | 944 | |
c5aa993b JM |
945 | These routines provide the packing and unpacking of gregset_t and |
946 | fpregset_t formatted data. | |
c906108c SS |
947 | |
948 | */ | |
949 | ||
950 | /* Atari SVR4 has R_SR but not R_PS */ | |
951 | ||
952 | #if !defined (R_PS) && defined (R_SR) | |
953 | #define R_PS R_SR | |
954 | #endif | |
955 | ||
956 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
957 | unpack the register contents and supply them as gdb's idea of the current |
958 | register values. */ | |
c906108c SS |
959 | |
960 | void | |
fba45db2 | 961 | supply_gregset (gregset_t *gregsetp) |
c906108c | 962 | { |
52f0bd74 AC |
963 | int regi; |
964 | greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 965 | |
c5aa993b | 966 | for (regi = 0; regi < R_PC; regi++) |
c906108c | 967 | { |
23a6d369 | 968 | regcache_raw_supply (current_regcache, regi, (char *) (regp + regi)); |
c906108c | 969 | } |
23a6d369 AC |
970 | regcache_raw_supply (current_regcache, PS_REGNUM, (char *) (regp + R_PS)); |
971 | regcache_raw_supply (current_regcache, PC_REGNUM, (char *) (regp + R_PC)); | |
c906108c SS |
972 | } |
973 | ||
974 | void | |
fba45db2 | 975 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c | 976 | { |
52f0bd74 AC |
977 | int regi; |
978 | greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 979 | |
c5aa993b | 980 | for (regi = 0; regi < R_PC; regi++) |
c906108c | 981 | { |
8de307e0 | 982 | if (regno == -1 || regno == regi) |
822c9732 | 983 | regcache_raw_collect (current_regcache, regi, regp + regi); |
c906108c | 984 | } |
8de307e0 | 985 | if (regno == -1 || regno == PS_REGNUM) |
822c9732 | 986 | regcache_raw_collect (current_regcache, PS_REGNUM, regp + R_PS); |
8de307e0 | 987 | if (regno == -1 || regno == PC_REGNUM) |
822c9732 | 988 | regcache_raw_collect (current_regcache, PC_REGNUM, regp + R_PC); |
c906108c SS |
989 | } |
990 | ||
991 | #if defined (FP0_REGNUM) | |
992 | ||
993 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
994 | (fpregset_t *), unpack the register contents and supply them as gdb's |
995 | idea of the current floating point register values. */ | |
c906108c | 996 | |
c5aa993b | 997 | void |
fba45db2 | 998 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c | 999 | { |
52f0bd74 | 1000 | int regi; |
c906108c | 1001 | char *from; |
c5aa993b | 1002 | |
32eeb91a | 1003 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 1004 | { |
c5aa993b | 1005 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
23a6d369 | 1006 | regcache_raw_supply (current_regcache, regi, from); |
c906108c | 1007 | } |
23a6d369 AC |
1008 | regcache_raw_supply (current_regcache, M68K_FPC_REGNUM, |
1009 | (char *) &(fpregsetp->f_pcr)); | |
1010 | regcache_raw_supply (current_regcache, M68K_FPS_REGNUM, | |
1011 | (char *) &(fpregsetp->f_psr)); | |
1012 | regcache_raw_supply (current_regcache, M68K_FPI_REGNUM, | |
1013 | (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
1014 | } |
1015 | ||
1016 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
1017 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
1018 | of the current floating point register set. If REGNO is -1, update | |
1019 | them all. */ | |
c906108c SS |
1020 | |
1021 | void | |
fba45db2 | 1022 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
1023 | { |
1024 | int regi; | |
c906108c | 1025 | |
32eeb91a | 1026 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 1027 | { |
8de307e0 | 1028 | if (regno == -1 || regno == regi) |
822c9732 AC |
1029 | regcache_raw_collect (current_regcache, regi, |
1030 | &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); | |
c906108c | 1031 | } |
8de307e0 | 1032 | if (regno == -1 || regno == M68K_FPC_REGNUM) |
822c9732 AC |
1033 | regcache_raw_collect (current_regcache, M68K_FPC_REGNUM, |
1034 | &fpregsetp->f_pcr); | |
8de307e0 | 1035 | if (regno == -1 || regno == M68K_FPS_REGNUM) |
822c9732 AC |
1036 | regcache_raw_collect (current_regcache, M68K_FPS_REGNUM, |
1037 | &fpregsetp->f_psr); | |
8de307e0 | 1038 | if (regno == -1 || regno == M68K_FPI_REGNUM) |
822c9732 AC |
1039 | regcache_raw_collect (current_regcache, M68K_FPI_REGNUM, |
1040 | &fpregsetp->f_fpiaddr); | |
c906108c SS |
1041 | } |
1042 | ||
c5aa993b | 1043 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 1044 | |
c5aa993b | 1045 | #endif /* USE_PROC_FS */ |
c906108c | 1046 | |
c906108c SS |
1047 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1048 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1049 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
1050 | This routine returns true on success. */ | |
1051 | ||
c34d127c | 1052 | static int |
f4281f55 | 1053 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 1054 | { |
f5cf7aa1 | 1055 | gdb_byte *buf; |
c906108c | 1056 | CORE_ADDR sp, jb_addr; |
eb2e12d7 AS |
1057 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
1058 | ||
1059 | if (tdep->jb_pc < 0) | |
1060 | { | |
1061 | internal_error (__FILE__, __LINE__, | |
e2e0b3e5 | 1062 | _("m68k_get_longjmp_target: not implemented")); |
eb2e12d7 AS |
1063 | return 0; |
1064 | } | |
c906108c | 1065 | |
35fc8285 | 1066 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 1067 | sp = read_register (SP_REGNUM); |
c906108c | 1068 | |
b5d78d39 GS |
1069 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
1070 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
1071 | return 0; |
1072 | ||
7c0b4a20 | 1073 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c | 1074 | |
eb2e12d7 | 1075 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c906108c SS |
1076 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
1077 | return 0; | |
1078 | ||
7c0b4a20 | 1079 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
1080 | return 1; |
1081 | } | |
f595cb19 MK |
1082 | \f |
1083 | ||
1084 | /* System V Release 4 (SVR4). */ | |
1085 | ||
1086 | void | |
1087 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1088 | { | |
1089 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1090 | ||
1091 | /* SVR4 uses a different calling convention. */ | |
1092 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1093 | ||
1094 | /* SVR4 uses %a0 instead of %a1. */ | |
1095 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1096 | } | |
1097 | \f | |
c906108c | 1098 | |
152d9db6 GS |
1099 | /* Function: m68k_gdbarch_init |
1100 | Initializer function for the m68k gdbarch vector. | |
1101 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1102 | ||
1103 | static struct gdbarch * | |
1104 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1105 | { | |
1106 | struct gdbarch_tdep *tdep = NULL; | |
1107 | struct gdbarch *gdbarch; | |
1108 | ||
1109 | /* find a candidate among the list of pre-declared architectures. */ | |
1110 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1111 | if (arches != NULL) | |
1112 | return (arches->gdbarch); | |
1113 | ||
eb2e12d7 AS |
1114 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1115 | gdbarch = gdbarch_alloc (&info, tdep); | |
152d9db6 | 1116 | |
5d3ed2e3 GS |
1117 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
1118 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1119 | ||
5d3ed2e3 | 1120 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1121 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1122 | |
1123 | /* Stack grows down. */ | |
1124 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
6300c360 GS |
1125 | |
1126 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 GS |
1127 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
1128 | ||
6300c360 | 1129 | set_gdbarch_frame_args_skip (gdbarch, 8); |
942dc0e9 | 1130 | |
8de307e0 | 1131 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1132 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
942dc0e9 GS |
1133 | set_gdbarch_num_regs (gdbarch, 29); |
1134 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); | |
32eeb91a | 1135 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1136 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1137 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1138 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
e47577ab MK |
1139 | set_gdbarch_convert_register_p (gdbarch, m68k_convert_register_p); |
1140 | set_gdbarch_register_to_value (gdbarch, m68k_register_to_value); | |
1141 | set_gdbarch_value_to_register (gdbarch, m68k_value_to_register); | |
a2c6a6d5 | 1142 | |
8de307e0 | 1143 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1144 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1145 | |
650fcc91 AS |
1146 | /* Disassembler. */ |
1147 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1148 | ||
eb2e12d7 AS |
1149 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1150 | tdep->jb_pc = JB_PC; | |
1151 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1152 | #else | |
1153 | tdep->jb_pc = -1; | |
1154 | #endif | |
f595cb19 | 1155 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
66894781 | 1156 | tdep->struct_return = reg_struct_return; |
8de307e0 AS |
1157 | |
1158 | /* Frame unwinder. */ | |
1159 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1160 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1161 | |
1162 | /* Hook in the DWARF CFI frame unwinder. */ | |
1163 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1164 | ||
8de307e0 | 1165 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1166 | |
55809acb AS |
1167 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1168 | gdbarch_init_osabi (info, gdbarch); | |
1169 | ||
eb2e12d7 AS |
1170 | /* Now we have tuned the configuration, set a few final things, |
1171 | based on what the OS ABI has told us. */ | |
1172 | ||
1173 | if (tdep->jb_pc >= 0) | |
1174 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1175 | ||
336d1bba | 1176 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1177 | |
152d9db6 GS |
1178 | return gdbarch; |
1179 | } | |
1180 | ||
1181 | ||
1182 | static void | |
1183 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1184 | { | |
eb2e12d7 | 1185 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1186 | |
eb2e12d7 AS |
1187 | if (tdep == NULL) |
1188 | return; | |
152d9db6 | 1189 | } |
2acceee2 | 1190 | |
a78f21af AC |
1191 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1192 | ||
c906108c | 1193 | void |
fba45db2 | 1194 | _initialize_m68k_tdep (void) |
c906108c | 1195 | { |
152d9db6 | 1196 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1197 | } |