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, | |
4 | 2001, 2002, 2003, 2004 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 | ||
eb2e12d7 | 68 | static const unsigned char * |
103a1597 GS |
69 | m68k_local_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
70 | { | |
71 | static unsigned char break_insn[] = {0x4e, (0x40 | BPT_VECTOR)}; | |
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__, | |
128 | "m68k_register_name: illegal register number %d", regnum); | |
129 | else | |
130 | return register_names[regnum]; | |
131 | } | |
8de307e0 | 132 | \f |
f595cb19 MK |
133 | /* There is a fair number of calling conventions that are in somewhat |
134 | wide use. The 68000/08/10 don't support an FPU, not even as a | |
135 | coprocessor. All function return values are stored in %d0/%d1. | |
136 | Structures are returned in a static buffer, a pointer to which is | |
137 | returned in %d0. This means that functions returning a structure | |
138 | are not re-entrant. To avoid this problem some systems use a | |
139 | convention where the caller passes a pointer to a buffer in %a1 | |
140 | where the return values is to be stored. This convention is the | |
141 | default, and is implemented in the function m68k_return_value. | |
142 | ||
143 | The 68020/030/040/060 do support an FPU, either as a coprocessor | |
144 | (68881/2) or built-in (68040/68060). That's why System V release 4 | |
145 | (SVR4) instroduces a new calling convention specified by the SVR4 | |
146 | psABI. Integer values are returned in %d0/%d1, pointer return | |
147 | values in %a0 and floating values in %fp0. When calling functions | |
148 | returning a structure the caller should pass a pointer to a buffer | |
149 | for the return value in %a0. This convention is implemented in the | |
150 | function m68k_svr4_return_value, and by appropriately setting the | |
151 | struct_value_regnum member of `struct gdbarch_tdep'. | |
152 | ||
153 | GNU/Linux returns values in the same way as SVR4 does, but uses %a1 | |
154 | for passing the structure return value buffer. | |
155 | ||
156 | GCC can also generate code where small structures are returned in | |
157 | %d0/%d1 instead of in memory by using -freg-struct-return. This is | |
158 | the default on NetBSD a.out, OpenBSD and GNU/Linux and several | |
159 | embedded systems. This convention is implemented by setting the | |
160 | struct_return member of `struct gdbarch_tdep' to reg_struct_return. */ | |
161 | ||
162 | /* Read a function return value of TYPE from REGCACHE, and copy that | |
8de307e0 | 163 | into VALBUF. */ |
942dc0e9 GS |
164 | |
165 | static void | |
8de307e0 AS |
166 | m68k_extract_return_value (struct type *type, struct regcache *regcache, |
167 | void *valbuf) | |
942dc0e9 | 168 | { |
8de307e0 AS |
169 | int len = TYPE_LENGTH (type); |
170 | char buf[M68K_MAX_REGISTER_SIZE]; | |
942dc0e9 | 171 | |
8de307e0 AS |
172 | if (len <= 4) |
173 | { | |
174 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
175 | memcpy (valbuf, buf + (4 - len), len); | |
176 | } | |
177 | else if (len <= 8) | |
178 | { | |
179 | regcache_raw_read (regcache, M68K_D0_REGNUM, buf); | |
180 | memcpy (valbuf, buf + (8 - len), len - 4); | |
181 | regcache_raw_read (regcache, M68K_D1_REGNUM, | |
182 | (char *) valbuf + (len - 4)); | |
183 | } | |
184 | else | |
185 | internal_error (__FILE__, __LINE__, | |
186 | "Cannot extract return value of %d bytes long.", len); | |
942dc0e9 GS |
187 | } |
188 | ||
942dc0e9 | 189 | static void |
f595cb19 MK |
190 | m68k_svr4_extract_return_value (struct type *type, struct regcache *regcache, |
191 | void *valbuf) | |
942dc0e9 | 192 | { |
8de307e0 | 193 | int len = TYPE_LENGTH (type); |
f595cb19 | 194 | char buf[M68K_MAX_REGISTER_SIZE]; |
942dc0e9 | 195 | |
f595cb19 | 196 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
8de307e0 | 197 | { |
f595cb19 MK |
198 | regcache_raw_read (regcache, M68K_FP0_REGNUM, buf); |
199 | convert_typed_floating (buf, builtin_type_m68881_ext, valbuf, type); | |
8de307e0 | 200 | } |
f595cb19 MK |
201 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) |
202 | regcache_raw_read (regcache, M68K_A0_REGNUM, valbuf); | |
203 | else | |
204 | m68k_extract_return_value (type, regcache, valbuf); | |
205 | } | |
206 | ||
207 | /* Write a function return value of TYPE from VALBUF into REGCACHE. */ | |
208 | ||
209 | static void | |
210 | m68k_store_return_value (struct type *type, struct regcache *regcache, | |
211 | const void *valbuf) | |
212 | { | |
213 | int len = TYPE_LENGTH (type); | |
942dc0e9 | 214 | |
8de307e0 AS |
215 | if (len <= 4) |
216 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 4 - len, len, valbuf); | |
217 | else if (len <= 8) | |
218 | { | |
f595cb19 | 219 | regcache_raw_write_part (regcache, M68K_D0_REGNUM, 8 - len, |
8de307e0 | 220 | len - 4, valbuf); |
f595cb19 | 221 | regcache_raw_write (regcache, M68K_D1_REGNUM, |
8de307e0 AS |
222 | (char *) valbuf + (len - 4)); |
223 | } | |
224 | else | |
225 | internal_error (__FILE__, __LINE__, | |
226 | "Cannot store return value of %d bytes long.", len); | |
227 | } | |
942dc0e9 | 228 | |
f595cb19 MK |
229 | static void |
230 | m68k_svr4_store_return_value (struct type *type, struct regcache *regcache, | |
231 | const void *valbuf) | |
942dc0e9 | 232 | { |
f595cb19 | 233 | int len = TYPE_LENGTH (type); |
8de307e0 | 234 | |
f595cb19 MK |
235 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
236 | { | |
237 | char buf[M68K_MAX_REGISTER_SIZE]; | |
238 | convert_typed_floating (valbuf, type, buf, builtin_type_m68881_ext); | |
239 | regcache_raw_write (regcache, M68K_FP0_REGNUM, buf); | |
240 | } | |
241 | else if (TYPE_CODE (type) == TYPE_CODE_PTR && len == 4) | |
242 | { | |
243 | regcache_raw_write (regcache, M68K_A0_REGNUM, valbuf); | |
244 | regcache_raw_write (regcache, M68K_D0_REGNUM, valbuf); | |
245 | } | |
246 | else | |
247 | m68k_store_return_value (type, regcache, valbuf); | |
942dc0e9 GS |
248 | } |
249 | ||
f595cb19 MK |
250 | /* Return non-zero if TYPE, which is assumed to be a structure or |
251 | union type, should be returned in registers for architecture | |
252 | GDBARCH. */ | |
253 | ||
c481dac7 | 254 | static int |
f595cb19 | 255 | m68k_reg_struct_return_p (struct gdbarch *gdbarch, struct type *type) |
c481dac7 | 256 | { |
f595cb19 MK |
257 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
258 | enum type_code code = TYPE_CODE (type); | |
259 | int len = TYPE_LENGTH (type); | |
c481dac7 | 260 | |
f595cb19 MK |
261 | gdb_assert (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION); |
262 | ||
263 | if (tdep->struct_return == pcc_struct_return) | |
264 | return 0; | |
265 | ||
266 | return (len == 1 || len == 2 || len == 4 || len == 8); | |
c481dac7 AS |
267 | } |
268 | ||
f595cb19 MK |
269 | /* Determine, for architecture GDBARCH, how a return value of TYPE |
270 | should be returned. If it is supposed to be returned in registers, | |
271 | and READBUF is non-zero, read the appropriate value from REGCACHE, | |
272 | and copy it into READBUF. If WRITEBUF is non-zero, write the value | |
273 | from WRITEBUF into REGCACHE. */ | |
274 | ||
275 | static enum return_value_convention | |
276 | m68k_return_value (struct gdbarch *gdbarch, struct type *type, | |
277 | struct regcache *regcache, void *readbuf, | |
278 | const void *writebuf) | |
279 | { | |
280 | enum type_code code = TYPE_CODE (type); | |
281 | ||
282 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
283 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
284 | return RETURN_VALUE_STRUCT_CONVENTION; | |
285 | ||
286 | /* GCC returns a `long double' in memory. */ | |
287 | if (code == TYPE_CODE_FLT && TYPE_LENGTH (type) == 12) | |
288 | return RETURN_VALUE_STRUCT_CONVENTION; | |
289 | ||
290 | if (readbuf) | |
291 | m68k_extract_return_value (type, regcache, readbuf); | |
292 | if (writebuf) | |
293 | m68k_store_return_value (type, regcache, writebuf); | |
294 | ||
295 | return RETURN_VALUE_REGISTER_CONVENTION; | |
296 | } | |
297 | ||
298 | static enum return_value_convention | |
299 | m68k_svr4_return_value (struct gdbarch *gdbarch, struct type *type, | |
300 | struct regcache *regcache, void *readbuf, | |
301 | const void *writebuf) | |
302 | { | |
303 | enum type_code code = TYPE_CODE (type); | |
304 | ||
305 | if ((code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION) | |
306 | && !m68k_reg_struct_return_p (gdbarch, type)) | |
307 | return RETURN_VALUE_STRUCT_CONVENTION; | |
308 | ||
309 | /* This special case is for structures consisting of a single | |
310 | `float' or `double' member. These structures are returned in | |
311 | %fp0. For these structures, we call ourselves recursively, | |
312 | changing TYPE into the type of the first member of the structure. | |
313 | Since that should work for all structures that have only one | |
314 | member, we don't bother to check the member's type here. */ | |
315 | if (code == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1) | |
316 | { | |
317 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); | |
318 | return m68k_svr4_return_value (gdbarch, type, regcache, | |
319 | readbuf, writebuf); | |
320 | } | |
321 | ||
322 | if (readbuf) | |
323 | m68k_svr4_extract_return_value (type, regcache, readbuf); | |
324 | if (writebuf) | |
325 | m68k_svr4_store_return_value (type, regcache, writebuf); | |
326 | ||
327 | return RETURN_VALUE_REGISTER_CONVENTION; | |
328 | } | |
329 | \f | |
330 | ||
942dc0e9 GS |
331 | /* A function that tells us whether the function invocation represented |
332 | by fi does not have a frame on the stack associated with it. If it | |
333 | does not, FRAMELESS is set to 1, else 0. */ | |
334 | ||
335 | static int | |
336 | m68k_frameless_function_invocation (struct frame_info *fi) | |
337 | { | |
32eeb91a | 338 | if (get_frame_type (fi) == SIGTRAMP_FRAME) |
942dc0e9 GS |
339 | return 0; |
340 | else | |
19772a2c | 341 | return legacy_frameless_look_for_prologue (fi); |
942dc0e9 GS |
342 | } |
343 | ||
89c3b6d3 | 344 | int |
fba45db2 | 345 | delta68_in_sigtramp (CORE_ADDR pc, char *name) |
89c3b6d3 | 346 | { |
1bd54964 AC |
347 | if (name != NULL) |
348 | return strcmp (name, "_sigcode") == 0; | |
349 | else | |
350 | return 0; | |
89c3b6d3 PDM |
351 | } |
352 | ||
353 | CORE_ADDR | |
fba45db2 | 354 | delta68_frame_args_address (struct frame_info *frame_info) |
89c3b6d3 PDM |
355 | { |
356 | /* we assume here that the only frameless functions are the system calls | |
357 | or other functions who do not put anything on the stack. */ | |
32eeb91a | 358 | if (get_frame_type (frame_info) == SIGTRAMP_FRAME) |
1e2330ba | 359 | return get_frame_base (frame_info) + 12; |
19772a2c | 360 | else if (legacy_frameless_look_for_prologue (frame_info)) |
89c3b6d3 | 361 | { |
b5d78d39 | 362 | /* Check for an interrupted system call */ |
11c02a10 AC |
363 | if (get_next_frame (frame_info) && (get_frame_type (get_next_frame (frame_info)) == SIGTRAMP_FRAME)) |
364 | return get_frame_base (get_next_frame (frame_info)) + 16; | |
b5d78d39 | 365 | else |
1e2330ba | 366 | return get_frame_base (frame_info) + 4; |
89c3b6d3 PDM |
367 | } |
368 | else | |
1e2330ba | 369 | return get_frame_base (frame_info); |
89c3b6d3 PDM |
370 | } |
371 | ||
372 | CORE_ADDR | |
fba45db2 | 373 | delta68_frame_saved_pc (struct frame_info *frame_info) |
89c3b6d3 | 374 | { |
b5fc49aa AS |
375 | return read_memory_unsigned_integer (delta68_frame_args_address (frame_info) |
376 | + 4, 4); | |
89c3b6d3 PDM |
377 | } |
378 | ||
392a587b | 379 | int |
fba45db2 | 380 | delta68_frame_num_args (struct frame_info *fi) |
392a587b JM |
381 | { |
382 | int val; | |
8bedc050 | 383 | CORE_ADDR pc = DEPRECATED_FRAME_SAVED_PC (fi); |
b5fc49aa | 384 | int insn = read_memory_unsigned_integer (pc, 2); |
392a587b | 385 | val = 0; |
c5aa993b | 386 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ |
392a587b | 387 | val = read_memory_integer (pc + 2, 2); |
c5aa993b JM |
388 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ |
389 | || (insn & 0170777) == 0050117) /* addqw */ | |
392a587b JM |
390 | { |
391 | val = (insn >> 9) & 7; | |
392 | if (val == 0) | |
393 | val = 8; | |
394 | } | |
c5aa993b | 395 | else if (insn == 0157774) /* addal #WW, sp */ |
392a587b JM |
396 | val = read_memory_integer (pc + 2, 4); |
397 | val >>= 2; | |
398 | return val; | |
399 | } | |
400 | ||
8de307e0 AS |
401 | static CORE_ADDR |
402 | m68k_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr, | |
403 | struct regcache *regcache, CORE_ADDR bp_addr, int nargs, | |
404 | struct value **args, CORE_ADDR sp, int struct_return, | |
405 | CORE_ADDR struct_addr) | |
7f8e7424 | 406 | { |
f595cb19 | 407 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
8de307e0 AS |
408 | char buf[4]; |
409 | int i; | |
410 | ||
411 | /* Push arguments in reverse order. */ | |
412 | for (i = nargs - 1; i >= 0; i--) | |
413 | { | |
c481dac7 AS |
414 | struct type *value_type = VALUE_ENCLOSING_TYPE (args[i]); |
415 | int len = TYPE_LENGTH (value_type); | |
8de307e0 | 416 | int container_len = (len + 3) & ~3; |
c481dac7 AS |
417 | int offset; |
418 | ||
419 | /* Non-scalars bigger than 4 bytes are left aligned, others are | |
420 | right aligned. */ | |
421 | if ((TYPE_CODE (value_type) == TYPE_CODE_STRUCT | |
422 | || TYPE_CODE (value_type) == TYPE_CODE_UNION | |
423 | || TYPE_CODE (value_type) == TYPE_CODE_ARRAY) | |
424 | && len > 4) | |
425 | offset = 0; | |
426 | else | |
427 | offset = container_len - len; | |
8de307e0 AS |
428 | sp -= container_len; |
429 | write_memory (sp + offset, VALUE_CONTENTS_ALL (args[i]), len); | |
430 | } | |
431 | ||
c481dac7 | 432 | /* Store struct value address. */ |
8de307e0 AS |
433 | if (struct_return) |
434 | { | |
8de307e0 | 435 | store_unsigned_integer (buf, 4, struct_addr); |
f595cb19 | 436 | regcache_cooked_write (regcache, tdep->struct_value_regnum, buf); |
8de307e0 AS |
437 | } |
438 | ||
439 | /* Store return address. */ | |
440 | sp -= 4; | |
441 | store_unsigned_integer (buf, 4, bp_addr); | |
442 | write_memory (sp, buf, 4); | |
443 | ||
444 | /* Finally, update the stack pointer... */ | |
445 | store_unsigned_integer (buf, 4, sp); | |
446 | regcache_cooked_write (regcache, M68K_SP_REGNUM, buf); | |
447 | ||
448 | /* ...and fake a frame pointer. */ | |
449 | regcache_cooked_write (regcache, M68K_FP_REGNUM, buf); | |
450 | ||
451 | /* DWARF2/GCC uses the stack address *before* the function call as a | |
452 | frame's CFA. */ | |
453 | return sp + 8; | |
7f8e7424 | 454 | } |
8de307e0 AS |
455 | \f |
456 | struct m68k_frame_cache | |
457 | { | |
458 | /* Base address. */ | |
459 | CORE_ADDR base; | |
460 | CORE_ADDR sp_offset; | |
461 | CORE_ADDR pc; | |
7f8e7424 | 462 | |
8de307e0 AS |
463 | /* Saved registers. */ |
464 | CORE_ADDR saved_regs[M68K_NUM_REGS]; | |
465 | CORE_ADDR saved_sp; | |
7f8e7424 | 466 | |
8de307e0 AS |
467 | /* Stack space reserved for local variables. */ |
468 | long locals; | |
469 | }; | |
c906108c | 470 | |
8de307e0 AS |
471 | /* Allocate and initialize a frame cache. */ |
472 | ||
473 | static struct m68k_frame_cache * | |
474 | m68k_alloc_frame_cache (void) | |
c906108c | 475 | { |
8de307e0 AS |
476 | struct m68k_frame_cache *cache; |
477 | int i; | |
c906108c | 478 | |
8de307e0 | 479 | cache = FRAME_OBSTACK_ZALLOC (struct m68k_frame_cache); |
c906108c | 480 | |
8de307e0 AS |
481 | /* Base address. */ |
482 | cache->base = 0; | |
483 | cache->sp_offset = -4; | |
484 | cache->pc = 0; | |
c906108c | 485 | |
8de307e0 AS |
486 | /* Saved registers. We initialize these to -1 since zero is a valid |
487 | offset (that's where %fp is supposed to be stored). */ | |
488 | for (i = 0; i < M68K_NUM_REGS; i++) | |
489 | cache->saved_regs[i] = -1; | |
490 | ||
491 | /* Frameless until proven otherwise. */ | |
492 | cache->locals = -1; | |
493 | ||
494 | return cache; | |
c906108c SS |
495 | } |
496 | ||
8de307e0 AS |
497 | /* Check whether PC points at a code that sets up a new stack frame. |
498 | If so, it updates CACHE and returns the address of the first | |
499 | instruction after the sequence that sets removes the "hidden" | |
500 | argument from the stack or CURRENT_PC, whichever is smaller. | |
501 | Otherwise, return PC. */ | |
c906108c | 502 | |
8de307e0 AS |
503 | static CORE_ADDR |
504 | m68k_analyze_frame_setup (CORE_ADDR pc, CORE_ADDR current_pc, | |
505 | struct m68k_frame_cache *cache) | |
c906108c | 506 | { |
8de307e0 AS |
507 | int op; |
508 | ||
509 | if (pc >= current_pc) | |
510 | return current_pc; | |
c906108c | 511 | |
8de307e0 AS |
512 | op = read_memory_unsigned_integer (pc, 2); |
513 | ||
514 | if (op == P_LINKW_FP || op == P_LINKL_FP || op == P_PEA_FP) | |
c906108c | 515 | { |
8de307e0 AS |
516 | cache->saved_regs[M68K_FP_REGNUM] = 0; |
517 | cache->sp_offset += 4; | |
518 | if (op == P_LINKW_FP) | |
519 | { | |
520 | /* link.w %fp, #-N */ | |
521 | /* link.w %fp, #0; adda.l #-N, %sp */ | |
522 | cache->locals = -read_memory_integer (pc + 2, 2); | |
523 | ||
524 | if (pc + 4 < current_pc && cache->locals == 0) | |
525 | { | |
526 | op = read_memory_unsigned_integer (pc + 4, 2); | |
527 | if (op == P_ADDAL_SP) | |
528 | { | |
529 | cache->locals = read_memory_integer (pc + 6, 4); | |
530 | return pc + 10; | |
531 | } | |
532 | } | |
533 | ||
534 | return pc + 4; | |
535 | } | |
536 | else if (op == P_LINKL_FP) | |
c906108c | 537 | { |
8de307e0 AS |
538 | /* link.l %fp, #-N */ |
539 | cache->locals = -read_memory_integer (pc + 2, 4); | |
540 | return pc + 6; | |
541 | } | |
542 | else | |
543 | { | |
544 | /* pea (%fp); movea.l %sp, %fp */ | |
545 | cache->locals = 0; | |
546 | ||
547 | if (pc + 2 < current_pc) | |
548 | { | |
549 | op = read_memory_unsigned_integer (pc + 2, 2); | |
550 | ||
551 | if (op == P_MOVEAL_SP_FP) | |
552 | { | |
553 | /* move.l %sp, %fp */ | |
554 | return pc + 4; | |
555 | } | |
556 | } | |
557 | ||
558 | return pc + 2; | |
c906108c SS |
559 | } |
560 | } | |
8de307e0 | 561 | else if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) |
c906108c | 562 | { |
8de307e0 AS |
563 | /* subq.[wl] #N,%sp */ |
564 | /* subq.[wl] #8,%sp; subq.[wl] #N,%sp */ | |
565 | cache->locals = (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
566 | if (pc + 2 < current_pc) | |
c906108c | 567 | { |
8de307e0 AS |
568 | op = read_memory_unsigned_integer (pc + 2, 2); |
569 | if ((op & 0170777) == P_SUBQW_SP || (op & 0170777) == P_SUBQL_SP) | |
570 | { | |
571 | cache->locals += (op & 07000) == 0 ? 8 : (op & 07000) >> 9; | |
572 | return pc + 4; | |
573 | } | |
c906108c | 574 | } |
8de307e0 AS |
575 | return pc + 2; |
576 | } | |
577 | else if (op == P_ADDAW_SP || op == P_LEA_SP_SP) | |
578 | { | |
579 | /* adda.w #-N,%sp */ | |
580 | /* lea (-N,%sp),%sp */ | |
581 | cache->locals = -read_memory_integer (pc + 2, 2); | |
582 | return pc + 4; | |
c906108c | 583 | } |
8de307e0 | 584 | else if (op == P_ADDAL_SP) |
c906108c | 585 | { |
8de307e0 AS |
586 | /* adda.l #-N,%sp */ |
587 | cache->locals = -read_memory_integer (pc + 2, 4); | |
588 | return pc + 6; | |
c906108c | 589 | } |
8de307e0 AS |
590 | |
591 | return pc; | |
c906108c | 592 | } |
c5aa993b | 593 | |
8de307e0 AS |
594 | /* Check whether PC points at code that saves registers on the stack. |
595 | If so, it updates CACHE and returns the address of the first | |
596 | instruction after the register saves or CURRENT_PC, whichever is | |
597 | smaller. Otherwise, return PC. */ | |
c906108c | 598 | |
8de307e0 AS |
599 | static CORE_ADDR |
600 | m68k_analyze_register_saves (CORE_ADDR pc, CORE_ADDR current_pc, | |
601 | struct m68k_frame_cache *cache) | |
602 | { | |
603 | if (cache->locals >= 0) | |
604 | { | |
605 | CORE_ADDR offset; | |
606 | int op; | |
607 | int i, mask, regno; | |
c906108c | 608 | |
8de307e0 AS |
609 | offset = -4 - cache->locals; |
610 | while (pc < current_pc) | |
611 | { | |
612 | op = read_memory_unsigned_integer (pc, 2); | |
613 | if (op == P_FMOVEMX_SP) | |
614 | { | |
615 | /* fmovem.x REGS,-(%sp) */ | |
616 | op = read_memory_unsigned_integer (pc + 2, 2); | |
617 | if ((op & 0xff00) == 0xe000) | |
618 | { | |
619 | mask = op & 0xff; | |
620 | for (i = 0; i < 16; i++, mask >>= 1) | |
621 | { | |
622 | if (mask & 1) | |
623 | { | |
624 | cache->saved_regs[i + M68K_FP0_REGNUM] = offset; | |
625 | offset -= 12; | |
626 | } | |
627 | } | |
628 | pc += 4; | |
629 | } | |
630 | else | |
631 | break; | |
632 | } | |
633 | else if ((op & 0170677) == P_MOVEL_SP) | |
634 | { | |
635 | /* move.l %R,-(%sp) */ | |
636 | regno = ((op & 07000) >> 9) | ((op & 0100) >> 3); | |
637 | cache->saved_regs[regno] = offset; | |
638 | offset -= 4; | |
639 | pc += 2; | |
640 | } | |
641 | else if (op == P_MOVEML_SP) | |
642 | { | |
643 | /* movem.l REGS,-(%sp) */ | |
644 | mask = read_memory_unsigned_integer (pc + 2, 2); | |
645 | for (i = 0; i < 16; i++, mask >>= 1) | |
646 | { | |
647 | if (mask & 1) | |
648 | { | |
649 | cache->saved_regs[15 - i] = offset; | |
650 | offset -= 4; | |
651 | } | |
652 | } | |
653 | pc += 4; | |
654 | } | |
655 | else | |
656 | break; | |
657 | } | |
658 | } | |
659 | ||
660 | return pc; | |
661 | } | |
c906108c | 662 | |
c906108c | 663 | |
8de307e0 AS |
664 | /* Do a full analysis of the prologue at PC and update CACHE |
665 | accordingly. Bail out early if CURRENT_PC is reached. Return the | |
666 | address where the analysis stopped. | |
c906108c | 667 | |
8de307e0 | 668 | We handle all cases that can be generated by gcc. |
c906108c | 669 | |
8de307e0 | 670 | For allocating a stack frame: |
c906108c | 671 | |
8de307e0 AS |
672 | link.w %a6,#-N |
673 | link.l %a6,#-N | |
674 | pea (%fp); move.l %sp,%fp | |
675 | link.w %a6,#0; add.l #-N,%sp | |
676 | subq.l #N,%sp | |
677 | subq.w #N,%sp | |
678 | subq.w #8,%sp; subq.w #N-8,%sp | |
679 | add.w #-N,%sp | |
680 | lea (-N,%sp),%sp | |
681 | add.l #-N,%sp | |
c906108c | 682 | |
8de307e0 | 683 | For saving registers: |
c906108c | 684 | |
8de307e0 AS |
685 | fmovem.x REGS,-(%sp) |
686 | move.l R1,-(%sp) | |
687 | move.l R1,-(%sp); move.l R2,-(%sp) | |
688 | movem.l REGS,-(%sp) | |
c906108c | 689 | |
8de307e0 | 690 | For setting up the PIC register: |
c906108c | 691 | |
8de307e0 | 692 | lea (%pc,N),%a5 |
c906108c | 693 | |
8de307e0 | 694 | */ |
c906108c | 695 | |
eb2e12d7 | 696 | static CORE_ADDR |
8de307e0 AS |
697 | m68k_analyze_prologue (CORE_ADDR pc, CORE_ADDR current_pc, |
698 | struct m68k_frame_cache *cache) | |
c906108c | 699 | { |
8de307e0 | 700 | unsigned int op; |
c906108c | 701 | |
8de307e0 AS |
702 | pc = m68k_analyze_frame_setup (pc, current_pc, cache); |
703 | pc = m68k_analyze_register_saves (pc, current_pc, cache); | |
704 | if (pc >= current_pc) | |
705 | return current_pc; | |
c906108c | 706 | |
8de307e0 AS |
707 | /* Check for GOT setup. */ |
708 | op = read_memory_unsigned_integer (pc, 4); | |
709 | if (op == P_LEA_PC_A5) | |
c906108c | 710 | { |
8de307e0 AS |
711 | /* lea (%pc,N),%a5 */ |
712 | return pc + 6; | |
c906108c | 713 | } |
8de307e0 AS |
714 | |
715 | return pc; | |
c906108c SS |
716 | } |
717 | ||
8de307e0 | 718 | /* Return PC of first real instruction. */ |
7f8e7424 | 719 | |
8de307e0 AS |
720 | static CORE_ADDR |
721 | m68k_skip_prologue (CORE_ADDR start_pc) | |
c906108c | 722 | { |
8de307e0 AS |
723 | struct m68k_frame_cache cache; |
724 | CORE_ADDR pc; | |
725 | int op; | |
c906108c | 726 | |
8de307e0 AS |
727 | cache.locals = -1; |
728 | pc = m68k_analyze_prologue (start_pc, (CORE_ADDR) -1, &cache); | |
729 | if (cache.locals < 0) | |
730 | return start_pc; | |
731 | return pc; | |
732 | } | |
c906108c | 733 | |
8de307e0 AS |
734 | static CORE_ADDR |
735 | m68k_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
736 | { | |
737 | char buf[8]; | |
7f8e7424 | 738 | |
8de307e0 AS |
739 | frame_unwind_register (next_frame, PC_REGNUM, buf); |
740 | return extract_typed_address (buf, builtin_type_void_func_ptr); | |
741 | } | |
742 | \f | |
743 | /* Normal frames. */ | |
7f8e7424 | 744 | |
8de307e0 AS |
745 | static struct m68k_frame_cache * |
746 | m68k_frame_cache (struct frame_info *next_frame, void **this_cache) | |
747 | { | |
748 | struct m68k_frame_cache *cache; | |
749 | char buf[4]; | |
750 | int i; | |
751 | ||
752 | if (*this_cache) | |
753 | return *this_cache; | |
754 | ||
755 | cache = m68k_alloc_frame_cache (); | |
756 | *this_cache = cache; | |
757 | ||
758 | /* In principle, for normal frames, %fp holds the frame pointer, | |
759 | which holds the base address for the current stack frame. | |
760 | However, for functions that don't need it, the frame pointer is | |
761 | optional. For these "frameless" functions the frame pointer is | |
762 | actually the frame pointer of the calling frame. Signal | |
763 | trampolines are just a special case of a "frameless" function. | |
764 | They (usually) share their frame pointer with the frame that was | |
765 | in progress when the signal occurred. */ | |
766 | ||
767 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); | |
768 | cache->base = extract_unsigned_integer (buf, 4); | |
769 | if (cache->base == 0) | |
770 | return cache; | |
771 | ||
772 | /* For normal frames, %pc is stored at 4(%fp). */ | |
773 | cache->saved_regs[M68K_PC_REGNUM] = 4; | |
774 | ||
775 | cache->pc = frame_func_unwind (next_frame); | |
776 | if (cache->pc != 0) | |
777 | m68k_analyze_prologue (cache->pc, frame_pc_unwind (next_frame), cache); | |
778 | ||
779 | if (cache->locals < 0) | |
780 | { | |
781 | /* We didn't find a valid frame, which means that CACHE->base | |
782 | currently holds the frame pointer for our calling frame. If | |
783 | we're at the start of a function, or somewhere half-way its | |
784 | prologue, the function's frame probably hasn't been fully | |
785 | setup yet. Try to reconstruct the base address for the stack | |
786 | frame by looking at the stack pointer. For truly "frameless" | |
787 | functions this might work too. */ | |
788 | ||
789 | frame_unwind_register (next_frame, M68K_SP_REGNUM, buf); | |
790 | cache->base = extract_unsigned_integer (buf, 4) + cache->sp_offset; | |
791 | } | |
7f8e7424 | 792 | |
8de307e0 AS |
793 | /* Now that we have the base address for the stack frame we can |
794 | calculate the value of %sp in the calling frame. */ | |
795 | cache->saved_sp = cache->base + 8; | |
7f8e7424 | 796 | |
8de307e0 AS |
797 | /* Adjust all the saved registers such that they contain addresses |
798 | instead of offsets. */ | |
799 | for (i = 0; i < M68K_NUM_REGS; i++) | |
800 | if (cache->saved_regs[i] != -1) | |
801 | cache->saved_regs[i] += cache->base; | |
c906108c | 802 | |
8de307e0 AS |
803 | return cache; |
804 | } | |
c906108c | 805 | |
8de307e0 AS |
806 | static void |
807 | m68k_frame_this_id (struct frame_info *next_frame, void **this_cache, | |
808 | struct frame_id *this_id) | |
809 | { | |
810 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
c906108c | 811 | |
8de307e0 AS |
812 | /* This marks the outermost frame. */ |
813 | if (cache->base == 0) | |
814 | return; | |
c5aa993b | 815 | |
8de307e0 AS |
816 | /* See the end of m68k_push_dummy_call. */ |
817 | *this_id = frame_id_build (cache->base + 8, cache->pc); | |
818 | } | |
c5aa993b | 819 | |
8de307e0 AS |
820 | static void |
821 | m68k_frame_prev_register (struct frame_info *next_frame, void **this_cache, | |
822 | int regnum, int *optimizedp, | |
823 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
824 | int *realnump, void *valuep) | |
825 | { | |
826 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
827 | ||
828 | gdb_assert (regnum >= 0); | |
829 | ||
830 | if (regnum == M68K_SP_REGNUM && cache->saved_sp) | |
c5aa993b | 831 | { |
8de307e0 AS |
832 | *optimizedp = 0; |
833 | *lvalp = not_lval; | |
834 | *addrp = 0; | |
835 | *realnump = -1; | |
836 | if (valuep) | |
c906108c | 837 | { |
8de307e0 AS |
838 | /* Store the value. */ |
839 | store_unsigned_integer (valuep, 4, cache->saved_sp); | |
89c3b6d3 | 840 | } |
8de307e0 AS |
841 | return; |
842 | } | |
843 | ||
844 | if (regnum < M68K_NUM_REGS && cache->saved_regs[regnum] != -1) | |
845 | { | |
846 | *optimizedp = 0; | |
847 | *lvalp = lval_memory; | |
848 | *addrp = cache->saved_regs[regnum]; | |
849 | *realnump = -1; | |
850 | if (valuep) | |
89c3b6d3 | 851 | { |
8de307e0 AS |
852 | /* Read the value in from memory. */ |
853 | read_memory (*addrp, valuep, | |
854 | register_size (current_gdbarch, regnum)); | |
89c3b6d3 | 855 | } |
8de307e0 | 856 | return; |
c906108c | 857 | } |
8de307e0 AS |
858 | |
859 | frame_register_unwind (next_frame, regnum, | |
860 | optimizedp, lvalp, addrp, realnump, valuep); | |
861 | } | |
862 | ||
863 | static const struct frame_unwind m68k_frame_unwind = | |
864 | { | |
865 | NORMAL_FRAME, | |
866 | m68k_frame_this_id, | |
867 | m68k_frame_prev_register | |
868 | }; | |
869 | ||
870 | static const struct frame_unwind * | |
336d1bba | 871 | m68k_frame_sniffer (struct frame_info *next_frame) |
8de307e0 AS |
872 | { |
873 | return &m68k_frame_unwind; | |
874 | } | |
875 | \f | |
8de307e0 AS |
876 | static CORE_ADDR |
877 | m68k_frame_base_address (struct frame_info *next_frame, void **this_cache) | |
878 | { | |
879 | struct m68k_frame_cache *cache = m68k_frame_cache (next_frame, this_cache); | |
880 | ||
881 | return cache->base; | |
882 | } | |
883 | ||
884 | static const struct frame_base m68k_frame_base = | |
885 | { | |
886 | &m68k_frame_unwind, | |
887 | m68k_frame_base_address, | |
888 | m68k_frame_base_address, | |
889 | m68k_frame_base_address | |
890 | }; | |
891 | ||
892 | static struct frame_id | |
893 | m68k_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
894 | { | |
895 | char buf[4]; | |
896 | CORE_ADDR fp; | |
c906108c | 897 | |
8de307e0 AS |
898 | frame_unwind_register (next_frame, M68K_FP_REGNUM, buf); |
899 | fp = extract_unsigned_integer (buf, 4); | |
c906108c | 900 | |
8de307e0 AS |
901 | /* See the end of m68k_push_dummy_call. */ |
902 | return frame_id_build (fp + 8, frame_pc_unwind (next_frame)); | |
903 | } | |
904 | \f | |
c5aa993b | 905 | #ifdef USE_PROC_FS /* Target dependent support for /proc */ |
c906108c SS |
906 | |
907 | #include <sys/procfs.h> | |
908 | ||
c60c0f5f MS |
909 | /* Prototypes for supply_gregset etc. */ |
910 | #include "gregset.h" | |
911 | ||
c906108c | 912 | /* The /proc interface divides the target machine's register set up into |
c5aa993b JM |
913 | two different sets, the general register set (gregset) and the floating |
914 | point register set (fpregset). For each set, there is an ioctl to get | |
915 | the current register set and another ioctl to set the current values. | |
c906108c | 916 | |
c5aa993b JM |
917 | The actual structure passed through the ioctl interface is, of course, |
918 | naturally machine dependent, and is different for each set of registers. | |
919 | For the m68k for example, the general register set is typically defined | |
920 | by: | |
c906108c | 921 | |
c5aa993b | 922 | typedef int gregset_t[18]; |
c906108c | 923 | |
c5aa993b JM |
924 | #define R_D0 0 |
925 | ... | |
926 | #define R_PS 17 | |
c906108c | 927 | |
c5aa993b | 928 | and the floating point set by: |
c906108c | 929 | |
c5aa993b JM |
930 | typedef struct fpregset { |
931 | int f_pcr; | |
932 | int f_psr; | |
933 | int f_fpiaddr; | |
934 | int f_fpregs[8][3]; (8 regs, 96 bits each) | |
935 | } fpregset_t; | |
c906108c | 936 | |
c5aa993b JM |
937 | These routines provide the packing and unpacking of gregset_t and |
938 | fpregset_t formatted data. | |
c906108c SS |
939 | |
940 | */ | |
941 | ||
942 | /* Atari SVR4 has R_SR but not R_PS */ | |
943 | ||
944 | #if !defined (R_PS) && defined (R_SR) | |
945 | #define R_PS R_SR | |
946 | #endif | |
947 | ||
948 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
c5aa993b JM |
949 | unpack the register contents and supply them as gdb's idea of the current |
950 | register values. */ | |
c906108c SS |
951 | |
952 | void | |
fba45db2 | 953 | supply_gregset (gregset_t *gregsetp) |
c906108c | 954 | { |
52f0bd74 AC |
955 | int regi; |
956 | greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 957 | |
c5aa993b | 958 | for (regi = 0; regi < R_PC; regi++) |
c906108c SS |
959 | { |
960 | supply_register (regi, (char *) (regp + regi)); | |
961 | } | |
962 | supply_register (PS_REGNUM, (char *) (regp + R_PS)); | |
963 | supply_register (PC_REGNUM, (char *) (regp + R_PC)); | |
964 | } | |
965 | ||
966 | void | |
fba45db2 | 967 | fill_gregset (gregset_t *gregsetp, int regno) |
c906108c | 968 | { |
52f0bd74 AC |
969 | int regi; |
970 | greg_t *regp = (greg_t *) gregsetp; | |
c906108c | 971 | |
c5aa993b | 972 | for (regi = 0; regi < R_PC; regi++) |
c906108c | 973 | { |
8de307e0 AS |
974 | if (regno == -1 || regno == regi) |
975 | regcache_collect (regi, regp + regi); | |
c906108c | 976 | } |
8de307e0 AS |
977 | if (regno == -1 || regno == PS_REGNUM) |
978 | regcache_collect (PS_REGNUM, regp + R_PS); | |
979 | if (regno == -1 || regno == PC_REGNUM) | |
980 | regcache_collect (PC_REGNUM, regp + R_PC); | |
c906108c SS |
981 | } |
982 | ||
983 | #if defined (FP0_REGNUM) | |
984 | ||
985 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
986 | (fpregset_t *), unpack the register contents and supply them as gdb's |
987 | idea of the current floating point register values. */ | |
c906108c | 988 | |
c5aa993b | 989 | void |
fba45db2 | 990 | supply_fpregset (fpregset_t *fpregsetp) |
c906108c | 991 | { |
52f0bd74 | 992 | int regi; |
c906108c | 993 | char *from; |
c5aa993b | 994 | |
32eeb91a | 995 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 996 | { |
c5aa993b | 997 | from = (char *) &(fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); |
c906108c SS |
998 | supply_register (regi, from); |
999 | } | |
32eeb91a AS |
1000 | supply_register (M68K_FPC_REGNUM, (char *) &(fpregsetp->f_pcr)); |
1001 | supply_register (M68K_FPS_REGNUM, (char *) &(fpregsetp->f_psr)); | |
1002 | supply_register (M68K_FPI_REGNUM, (char *) &(fpregsetp->f_fpiaddr)); | |
c906108c SS |
1003 | } |
1004 | ||
1005 | /* Given a pointer to a floating point register set in /proc format | |
c5aa993b JM |
1006 | (fpregset_t *), update the register specified by REGNO from gdb's idea |
1007 | of the current floating point register set. If REGNO is -1, update | |
1008 | them all. */ | |
c906108c SS |
1009 | |
1010 | void | |
fba45db2 | 1011 | fill_fpregset (fpregset_t *fpregsetp, int regno) |
c906108c SS |
1012 | { |
1013 | int regi; | |
c906108c | 1014 | |
32eeb91a | 1015 | for (regi = FP0_REGNUM; regi < M68K_FPC_REGNUM; regi++) |
c906108c | 1016 | { |
8de307e0 AS |
1017 | if (regno == -1 || regno == regi) |
1018 | regcache_collect (regi, &fpregsetp->f_fpregs[regi - FP0_REGNUM][0]); | |
c906108c | 1019 | } |
8de307e0 AS |
1020 | if (regno == -1 || regno == M68K_FPC_REGNUM) |
1021 | regcache_collect (M68K_FPC_REGNUM, &fpregsetp->f_pcr); | |
1022 | if (regno == -1 || regno == M68K_FPS_REGNUM) | |
1023 | regcache_collect (M68K_FPS_REGNUM, &fpregsetp->f_psr); | |
1024 | if (regno == -1 || regno == M68K_FPI_REGNUM) | |
1025 | regcache_collect (M68K_FPI_REGNUM, &fpregsetp->f_fpiaddr); | |
c906108c SS |
1026 | } |
1027 | ||
c5aa993b | 1028 | #endif /* defined (FP0_REGNUM) */ |
c906108c | 1029 | |
c5aa993b | 1030 | #endif /* USE_PROC_FS */ |
c906108c | 1031 | |
c906108c SS |
1032 | /* Figure out where the longjmp will land. Slurp the args out of the stack. |
1033 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
1034 | we extract the pc (JB_PC) that we will land at. The pc is copied into PC. | |
1035 | This routine returns true on success. */ | |
1036 | ||
1037 | int | |
f4281f55 | 1038 | m68k_get_longjmp_target (CORE_ADDR *pc) |
c906108c | 1039 | { |
35fc8285 | 1040 | char *buf; |
c906108c | 1041 | CORE_ADDR sp, jb_addr; |
eb2e12d7 AS |
1042 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
1043 | ||
1044 | if (tdep->jb_pc < 0) | |
1045 | { | |
1046 | internal_error (__FILE__, __LINE__, | |
1047 | "m68k_get_longjmp_target: not implemented"); | |
1048 | return 0; | |
1049 | } | |
c906108c | 1050 | |
35fc8285 | 1051 | buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c5aa993b | 1052 | sp = read_register (SP_REGNUM); |
c906108c | 1053 | |
b5d78d39 GS |
1054 | if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */ |
1055 | buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) | |
c906108c SS |
1056 | return 0; |
1057 | ||
7c0b4a20 | 1058 | jb_addr = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c | 1059 | |
eb2e12d7 | 1060 | if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf, |
c906108c SS |
1061 | TARGET_PTR_BIT / TARGET_CHAR_BIT)) |
1062 | return 0; | |
1063 | ||
7c0b4a20 | 1064 | *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); |
c906108c SS |
1065 | return 1; |
1066 | } | |
f595cb19 MK |
1067 | \f |
1068 | ||
1069 | /* System V Release 4 (SVR4). */ | |
1070 | ||
1071 | void | |
1072 | m68k_svr4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
1073 | { | |
1074 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1075 | ||
1076 | /* SVR4 uses a different calling convention. */ | |
1077 | set_gdbarch_return_value (gdbarch, m68k_svr4_return_value); | |
1078 | ||
1079 | /* SVR4 uses %a0 instead of %a1. */ | |
1080 | tdep->struct_value_regnum = M68K_A0_REGNUM; | |
1081 | } | |
1082 | \f | |
c906108c | 1083 | |
152d9db6 GS |
1084 | /* Function: m68k_gdbarch_init |
1085 | Initializer function for the m68k gdbarch vector. | |
1086 | Called by gdbarch. Sets up the gdbarch vector(s) for this target. */ | |
1087 | ||
1088 | static struct gdbarch * | |
1089 | m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
1090 | { | |
1091 | struct gdbarch_tdep *tdep = NULL; | |
1092 | struct gdbarch *gdbarch; | |
1093 | ||
1094 | /* find a candidate among the list of pre-declared architectures. */ | |
1095 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1096 | if (arches != NULL) | |
1097 | return (arches->gdbarch); | |
1098 | ||
eb2e12d7 AS |
1099 | tdep = xmalloc (sizeof (struct gdbarch_tdep)); |
1100 | gdbarch = gdbarch_alloc (&info, tdep); | |
152d9db6 | 1101 | |
5d3ed2e3 GS |
1102 | set_gdbarch_long_double_format (gdbarch, &floatformat_m68881_ext); |
1103 | set_gdbarch_long_double_bit (gdbarch, 96); | |
1104 | ||
5d3ed2e3 | 1105 | set_gdbarch_skip_prologue (gdbarch, m68k_skip_prologue); |
103a1597 | 1106 | set_gdbarch_breakpoint_from_pc (gdbarch, m68k_local_breakpoint_from_pc); |
5d3ed2e3 GS |
1107 | |
1108 | /* Stack grows down. */ | |
1109 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
78bf922a | 1110 | set_gdbarch_parm_boundary (gdbarch, 32); |
6300c360 GS |
1111 | |
1112 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
942dc0e9 GS |
1113 | set_gdbarch_decr_pc_after_break (gdbarch, 2); |
1114 | ||
19772a2c | 1115 | set_gdbarch_deprecated_frameless_function_invocation (gdbarch, m68k_frameless_function_invocation); |
6300c360 | 1116 | set_gdbarch_frame_args_skip (gdbarch, 8); |
942dc0e9 | 1117 | |
8de307e0 | 1118 | set_gdbarch_register_type (gdbarch, m68k_register_type); |
5d3ed2e3 | 1119 | set_gdbarch_register_name (gdbarch, m68k_register_name); |
942dc0e9 GS |
1120 | set_gdbarch_num_regs (gdbarch, 29); |
1121 | set_gdbarch_register_bytes_ok (gdbarch, m68k_register_bytes_ok); | |
32eeb91a | 1122 | set_gdbarch_sp_regnum (gdbarch, M68K_SP_REGNUM); |
32eeb91a AS |
1123 | set_gdbarch_pc_regnum (gdbarch, M68K_PC_REGNUM); |
1124 | set_gdbarch_ps_regnum (gdbarch, M68K_PS_REGNUM); | |
1125 | set_gdbarch_fp0_regnum (gdbarch, M68K_FP0_REGNUM); | |
a2c6a6d5 | 1126 | |
8de307e0 | 1127 | set_gdbarch_push_dummy_call (gdbarch, m68k_push_dummy_call); |
f595cb19 | 1128 | set_gdbarch_return_value (gdbarch, m68k_return_value); |
6c0e89ed | 1129 | |
650fcc91 AS |
1130 | /* Disassembler. */ |
1131 | set_gdbarch_print_insn (gdbarch, print_insn_m68k); | |
1132 | ||
eb2e12d7 AS |
1133 | #if defined JB_PC && defined JB_ELEMENT_SIZE |
1134 | tdep->jb_pc = JB_PC; | |
1135 | tdep->jb_elt_size = JB_ELEMENT_SIZE; | |
1136 | #else | |
1137 | tdep->jb_pc = -1; | |
1138 | #endif | |
f595cb19 | 1139 | tdep->struct_value_regnum = M68K_A1_REGNUM; |
c481dac7 | 1140 | tdep->struct_return = pcc_struct_return; |
8de307e0 AS |
1141 | |
1142 | /* Frame unwinder. */ | |
1143 | set_gdbarch_unwind_dummy_id (gdbarch, m68k_unwind_dummy_id); | |
1144 | set_gdbarch_unwind_pc (gdbarch, m68k_unwind_pc); | |
3f244638 AS |
1145 | |
1146 | /* Hook in the DWARF CFI frame unwinder. */ | |
1147 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); | |
1148 | ||
8de307e0 | 1149 | frame_base_set_default (gdbarch, &m68k_frame_base); |
eb2e12d7 | 1150 | |
55809acb AS |
1151 | /* Hook in ABI-specific overrides, if they have been registered. */ |
1152 | gdbarch_init_osabi (info, gdbarch); | |
1153 | ||
eb2e12d7 AS |
1154 | /* Now we have tuned the configuration, set a few final things, |
1155 | based on what the OS ABI has told us. */ | |
1156 | ||
1157 | if (tdep->jb_pc >= 0) | |
1158 | set_gdbarch_get_longjmp_target (gdbarch, m68k_get_longjmp_target); | |
1159 | ||
336d1bba | 1160 | frame_unwind_append_sniffer (gdbarch, m68k_frame_sniffer); |
8de307e0 | 1161 | |
152d9db6 GS |
1162 | return gdbarch; |
1163 | } | |
1164 | ||
1165 | ||
1166 | static void | |
1167 | m68k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) | |
1168 | { | |
eb2e12d7 | 1169 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); |
152d9db6 | 1170 | |
eb2e12d7 AS |
1171 | if (tdep == NULL) |
1172 | return; | |
152d9db6 | 1173 | } |
2acceee2 | 1174 | |
a78f21af AC |
1175 | extern initialize_file_ftype _initialize_m68k_tdep; /* -Wmissing-prototypes */ |
1176 | ||
c906108c | 1177 | void |
fba45db2 | 1178 | _initialize_m68k_tdep (void) |
c906108c | 1179 | { |
152d9db6 | 1180 | gdbarch_register (bfd_arch_m68k, m68k_gdbarch_init, m68k_dump_tdep); |
c906108c | 1181 | } |