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d031aafb | 1 | /* Target-dependent code for Morpho mt processor, for GDB. |
61def6bd | 2 | |
61baf725 | 3 | Copyright (C) 2005-2017 Free Software Foundation, Inc. |
61def6bd KB |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
61def6bd KB |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
61def6bd KB |
19 | |
20 | /* Contributed by Michael Snyder, msnyder@redhat.com. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "frame-unwind.h" | |
25 | #include "frame-base.h" | |
26 | #include "symtab.h" | |
27 | #include "dis-asm.h" | |
28 | #include "arch-utils.h" | |
29 | #include "gdbtypes.h" | |
61def6bd KB |
30 | #include "regcache.h" |
31 | #include "reggroups.h" | |
32 | #include "gdbcore.h" | |
33 | #include "trad-frame.h" | |
34 | #include "inferior.h" | |
35 | #include "dwarf2-frame.h" | |
36 | #include "infcall.h" | |
d8ca156b | 37 | #include "language.h" |
79a45b7d | 38 | #include "valprint.h" |
61def6bd | 39 | |
d031aafb | 40 | enum mt_arch_constants |
61def6bd | 41 | { |
d031aafb | 42 | MT_MAX_STRUCT_SIZE = 16 |
61def6bd KB |
43 | }; |
44 | ||
d031aafb | 45 | enum mt_gdb_regnums |
61def6bd | 46 | { |
d031aafb NS |
47 | MT_R0_REGNUM, /* 32 bit regs. */ |
48 | MT_R1_REGNUM, | |
49 | MT_1ST_ARGREG = MT_R1_REGNUM, | |
50 | MT_R2_REGNUM, | |
51 | MT_R3_REGNUM, | |
52 | MT_R4_REGNUM, | |
53 | MT_LAST_ARGREG = MT_R4_REGNUM, | |
54 | MT_R5_REGNUM, | |
55 | MT_R6_REGNUM, | |
56 | MT_R7_REGNUM, | |
57 | MT_R8_REGNUM, | |
58 | MT_R9_REGNUM, | |
59 | MT_R10_REGNUM, | |
60 | MT_R11_REGNUM, | |
61 | MT_R12_REGNUM, | |
62 | MT_FP_REGNUM = MT_R12_REGNUM, | |
63 | MT_R13_REGNUM, | |
64 | MT_SP_REGNUM = MT_R13_REGNUM, | |
65 | MT_R14_REGNUM, | |
66 | MT_RA_REGNUM = MT_R14_REGNUM, | |
67 | MT_R15_REGNUM, | |
68 | MT_IRA_REGNUM = MT_R15_REGNUM, | |
69 | MT_PC_REGNUM, | |
61def6bd KB |
70 | |
71 | /* Interrupt Enable pseudo-register, exported by SID. */ | |
d031aafb | 72 | MT_INT_ENABLE_REGNUM, |
61def6bd KB |
73 | /* End of CPU regs. */ |
74 | ||
d031aafb | 75 | MT_NUM_CPU_REGS, |
61def6bd KB |
76 | |
77 | /* Co-processor registers. */ | |
d031aafb NS |
78 | MT_COPRO_REGNUM = MT_NUM_CPU_REGS, /* 16 bit regs. */ |
79 | MT_CPR0_REGNUM, | |
80 | MT_CPR1_REGNUM, | |
81 | MT_CPR2_REGNUM, | |
82 | MT_CPR3_REGNUM, | |
83 | MT_CPR4_REGNUM, | |
84 | MT_CPR5_REGNUM, | |
85 | MT_CPR6_REGNUM, | |
86 | MT_CPR7_REGNUM, | |
87 | MT_CPR8_REGNUM, | |
88 | MT_CPR9_REGNUM, | |
89 | MT_CPR10_REGNUM, | |
90 | MT_CPR11_REGNUM, | |
91 | MT_CPR12_REGNUM, | |
92 | MT_CPR13_REGNUM, | |
93 | MT_CPR14_REGNUM, | |
94 | MT_CPR15_REGNUM, | |
95 | MT_BYPA_REGNUM, /* 32 bit regs. */ | |
96 | MT_BYPB_REGNUM, | |
97 | MT_BYPC_REGNUM, | |
98 | MT_FLAG_REGNUM, | |
99 | MT_CONTEXT_REGNUM, /* 38 bits (treat as array of | |
61def6bd | 100 | six bytes). */ |
d031aafb NS |
101 | MT_MAC_REGNUM, /* 32 bits. */ |
102 | MT_Z1_REGNUM, /* 16 bits. */ | |
103 | MT_Z2_REGNUM, /* 16 bits. */ | |
104 | MT_ICHANNEL_REGNUM, /* 32 bits. */ | |
105 | MT_ISCRAMB_REGNUM, /* 32 bits. */ | |
106 | MT_QSCRAMB_REGNUM, /* 32 bits. */ | |
107 | MT_OUT_REGNUM, /* 16 bits. */ | |
108 | MT_EXMAC_REGNUM, /* 32 bits (8 used). */ | |
109 | MT_QCHANNEL_REGNUM, /* 32 bits. */ | |
03a73f77 MM |
110 | MT_ZI2_REGNUM, /* 16 bits. */ |
111 | MT_ZQ2_REGNUM, /* 16 bits. */ | |
112 | MT_CHANNEL2_REGNUM, /* 32 bits. */ | |
113 | MT_ISCRAMB2_REGNUM, /* 32 bits. */ | |
114 | MT_QSCRAMB2_REGNUM, /* 32 bits. */ | |
115 | MT_QCHANNEL2_REGNUM, /* 32 bits. */ | |
61def6bd KB |
116 | |
117 | /* Number of real registers. */ | |
d031aafb | 118 | MT_NUM_REGS, |
61def6bd KB |
119 | |
120 | /* Pseudo-registers. */ | |
d031aafb NS |
121 | MT_COPRO_PSEUDOREG_REGNUM = MT_NUM_REGS, |
122 | MT_MAC_PSEUDOREG_REGNUM, | |
60e81fcc NS |
123 | MT_COPRO_PSEUDOREG_ARRAY, |
124 | ||
125 | MT_COPRO_PSEUDOREG_DIM_1 = 2, | |
126 | MT_COPRO_PSEUDOREG_DIM_2 = 8, | |
03a73f77 MM |
127 | /* The number of pseudo-registers for each coprocessor. These |
128 | include the real coprocessor registers, the pseudo-registe for | |
129 | the coprocessor number, and the pseudo-register for the MAC. */ | |
130 | MT_COPRO_PSEUDOREG_REGS = MT_NUM_REGS - MT_NUM_CPU_REGS + 2, | |
131 | /* The register number of the MAC, relative to a given coprocessor. */ | |
132 | MT_COPRO_PSEUDOREG_MAC_REGNUM = MT_COPRO_PSEUDOREG_REGS - 1, | |
61def6bd KB |
133 | |
134 | /* Two pseudo-regs ('coprocessor' and 'mac'). */ | |
60e81fcc NS |
135 | MT_NUM_PSEUDO_REGS = 2 + (MT_COPRO_PSEUDOREG_REGS |
136 | * MT_COPRO_PSEUDOREG_DIM_1 | |
137 | * MT_COPRO_PSEUDOREG_DIM_2) | |
61def6bd KB |
138 | }; |
139 | ||
df4df182 UW |
140 | /* The tdep structure. */ |
141 | struct gdbarch_tdep | |
142 | { | |
143 | /* ISA-specific types. */ | |
144 | struct type *copro_type; | |
145 | }; | |
146 | ||
147 | ||
61def6bd KB |
148 | /* Return name of register number specified by REGNUM. */ |
149 | ||
150 | static const char * | |
d93859e2 | 151 | mt_register_name (struct gdbarch *gdbarch, int regnum) |
61def6bd | 152 | { |
58b78171 | 153 | static const char *const register_names[] = { |
61def6bd KB |
154 | /* CPU regs. */ |
155 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
156 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
157 | "pc", "IE", | |
158 | /* Co-processor regs. */ | |
159 | "", /* copro register. */ | |
160 | "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7", | |
161 | "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15", | |
162 | "bypa", "bypb", "bypc", "flag", "context", "" /* mac. */ , "z1", "z2", | |
163 | "Ichannel", "Iscramb", "Qscramb", "out", "" /* ex-mac. */ , "Qchannel", | |
03a73f77 | 164 | "zi2", "zq2", "Ichannel2", "Iscramb2", "Qscramb2", "Qchannel2", |
61def6bd KB |
165 | /* Pseudo-registers. */ |
166 | "coprocessor", "MAC" | |
167 | }; | |
60e81fcc NS |
168 | static const char *array_names[MT_COPRO_PSEUDOREG_REGS |
169 | * MT_COPRO_PSEUDOREG_DIM_1 | |
170 | * MT_COPRO_PSEUDOREG_DIM_2]; | |
171 | ||
172 | if (regnum < 0) | |
173 | return ""; | |
174 | if (regnum < ARRAY_SIZE (register_names)) | |
175 | return register_names[regnum]; | |
176 | if (array_names[regnum - MT_COPRO_PSEUDOREG_ARRAY]) | |
177 | return array_names[regnum - MT_COPRO_PSEUDOREG_ARRAY]; | |
178 | ||
179 | { | |
180 | char *name; | |
181 | const char *stub; | |
182 | unsigned dim_1; | |
183 | unsigned dim_2; | |
184 | unsigned index; | |
185 | ||
186 | regnum -= MT_COPRO_PSEUDOREG_ARRAY; | |
187 | index = regnum % MT_COPRO_PSEUDOREG_REGS; | |
188 | dim_2 = (regnum / MT_COPRO_PSEUDOREG_REGS) % MT_COPRO_PSEUDOREG_DIM_2; | |
189 | dim_1 = ((regnum / MT_COPRO_PSEUDOREG_REGS / MT_COPRO_PSEUDOREG_DIM_2) | |
190 | % MT_COPRO_PSEUDOREG_DIM_1); | |
191 | ||
03a73f77 | 192 | if (index == MT_COPRO_PSEUDOREG_MAC_REGNUM) |
60e81fcc | 193 | stub = register_names[MT_MAC_PSEUDOREG_REGNUM]; |
03a73f77 | 194 | else if (index >= MT_NUM_REGS - MT_CPR0_REGNUM) |
60e81fcc NS |
195 | stub = ""; |
196 | else | |
197 | stub = register_names[index + MT_CPR0_REGNUM]; | |
198 | if (!*stub) | |
199 | { | |
200 | array_names[regnum] = stub; | |
201 | return stub; | |
202 | } | |
224c3ddb | 203 | name = (char *) xmalloc (30); |
60e81fcc NS |
204 | sprintf (name, "copro_%d_%d_%s", dim_1, dim_2, stub); |
205 | array_names[regnum] = name; | |
206 | return name; | |
207 | } | |
208 | } | |
61def6bd | 209 | |
60e81fcc NS |
210 | /* Return the type of a coprocessor register. */ |
211 | ||
212 | static struct type * | |
213 | mt_copro_register_type (struct gdbarch *arch, int regnum) | |
214 | { | |
215 | switch (regnum) | |
216 | { | |
217 | case MT_INT_ENABLE_REGNUM: | |
218 | case MT_ICHANNEL_REGNUM: | |
219 | case MT_QCHANNEL_REGNUM: | |
220 | case MT_ISCRAMB_REGNUM: | |
221 | case MT_QSCRAMB_REGNUM: | |
df4df182 | 222 | return builtin_type (arch)->builtin_int32; |
60e81fcc NS |
223 | case MT_BYPA_REGNUM: |
224 | case MT_BYPB_REGNUM: | |
225 | case MT_BYPC_REGNUM: | |
226 | case MT_Z1_REGNUM: | |
227 | case MT_Z2_REGNUM: | |
228 | case MT_OUT_REGNUM: | |
03a73f77 MM |
229 | case MT_ZI2_REGNUM: |
230 | case MT_ZQ2_REGNUM: | |
df4df182 | 231 | return builtin_type (arch)->builtin_int16; |
60e81fcc NS |
232 | case MT_EXMAC_REGNUM: |
233 | case MT_MAC_REGNUM: | |
df4df182 | 234 | return builtin_type (arch)->builtin_uint32; |
60e81fcc | 235 | case MT_CONTEXT_REGNUM: |
0dfff4cb | 236 | return builtin_type (arch)->builtin_long_long; |
60e81fcc | 237 | case MT_FLAG_REGNUM: |
0dfff4cb | 238 | return builtin_type (arch)->builtin_unsigned_char; |
60e81fcc NS |
239 | default: |
240 | if (regnum >= MT_CPR0_REGNUM && regnum <= MT_CPR15_REGNUM) | |
df4df182 | 241 | return builtin_type (arch)->builtin_int16; |
03a73f77 | 242 | else if (regnum == MT_CPR0_REGNUM + MT_COPRO_PSEUDOREG_MAC_REGNUM) |
60e81fcc NS |
243 | { |
244 | if (gdbarch_bfd_arch_info (arch)->mach == bfd_mach_mrisc2 | |
245 | || gdbarch_bfd_arch_info (arch)->mach == bfd_mach_ms2) | |
df4df182 | 246 | return builtin_type (arch)->builtin_uint64; |
60e81fcc | 247 | else |
df4df182 | 248 | return builtin_type (arch)->builtin_uint32; |
60e81fcc NS |
249 | } |
250 | else | |
df4df182 | 251 | return builtin_type (arch)->builtin_uint32; |
60e81fcc | 252 | } |
61def6bd KB |
253 | } |
254 | ||
255 | /* Given ARCH and a register number specified by REGNUM, return the | |
256 | type of that register. */ | |
257 | ||
258 | static struct type * | |
d031aafb | 259 | mt_register_type (struct gdbarch *arch, int regnum) |
61def6bd | 260 | { |
df4df182 | 261 | struct gdbarch_tdep *tdep = gdbarch_tdep (arch); |
61def6bd | 262 | |
d031aafb | 263 | if (regnum >= 0 && regnum < MT_NUM_REGS + MT_NUM_PSEUDO_REGS) |
61def6bd | 264 | { |
61def6bd KB |
265 | switch (regnum) |
266 | { | |
d031aafb NS |
267 | case MT_PC_REGNUM: |
268 | case MT_RA_REGNUM: | |
269 | case MT_IRA_REGNUM: | |
fde6c819 | 270 | return builtin_type (arch)->builtin_func_ptr; |
d031aafb NS |
271 | case MT_SP_REGNUM: |
272 | case MT_FP_REGNUM: | |
fde6c819 | 273 | return builtin_type (arch)->builtin_data_ptr; |
d031aafb NS |
274 | case MT_COPRO_REGNUM: |
275 | case MT_COPRO_PSEUDOREG_REGNUM: | |
df4df182 UW |
276 | if (tdep->copro_type == NULL) |
277 | { | |
278 | struct type *elt = builtin_type (arch)->builtin_int16; | |
279 | tdep->copro_type = lookup_array_range_type (elt, 0, 1); | |
280 | } | |
281 | return tdep->copro_type; | |
d031aafb | 282 | case MT_MAC_PSEUDOREG_REGNUM: |
60e81fcc NS |
283 | return mt_copro_register_type (arch, |
284 | MT_CPR0_REGNUM | |
03a73f77 | 285 | + MT_COPRO_PSEUDOREG_MAC_REGNUM); |
61def6bd | 286 | default: |
d031aafb | 287 | if (regnum >= MT_R0_REGNUM && regnum <= MT_R15_REGNUM) |
df4df182 | 288 | return builtin_type (arch)->builtin_int32; |
60e81fcc NS |
289 | else if (regnum < MT_COPRO_PSEUDOREG_ARRAY) |
290 | return mt_copro_register_type (arch, regnum); | |
291 | else | |
292 | { | |
293 | regnum -= MT_COPRO_PSEUDOREG_ARRAY; | |
294 | regnum %= MT_COPRO_PSEUDOREG_REGS; | |
295 | regnum += MT_CPR0_REGNUM; | |
296 | return mt_copro_register_type (arch, regnum); | |
297 | } | |
61def6bd KB |
298 | } |
299 | } | |
300 | internal_error (__FILE__, __LINE__, | |
d031aafb | 301 | _("mt_register_type: illegal register number %d"), regnum); |
61def6bd KB |
302 | } |
303 | ||
304 | /* Return true if register REGNUM is a member of the register group | |
305 | specified by GROUP. */ | |
306 | ||
307 | static int | |
d031aafb | 308 | mt_register_reggroup_p (struct gdbarch *gdbarch, int regnum, |
61def6bd KB |
309 | struct reggroup *group) |
310 | { | |
311 | /* Groups of registers that can be displayed via "info reg". */ | |
312 | if (group == all_reggroup) | |
313 | return (regnum >= 0 | |
d031aafb | 314 | && regnum < MT_NUM_REGS + MT_NUM_PSEUDO_REGS |
d93859e2 | 315 | && mt_register_name (gdbarch, regnum)[0] != '\0'); |
61def6bd KB |
316 | |
317 | if (group == general_reggroup) | |
d031aafb | 318 | return (regnum >= MT_R0_REGNUM && regnum <= MT_R15_REGNUM); |
61def6bd KB |
319 | |
320 | if (group == float_reggroup) | |
321 | return 0; /* No float regs. */ | |
322 | ||
323 | if (group == vector_reggroup) | |
324 | return 0; /* No vector regs. */ | |
325 | ||
326 | /* For any that are not handled above. */ | |
327 | return default_register_reggroup_p (gdbarch, regnum, group); | |
328 | } | |
329 | ||
330 | /* Return the return value convention used for a given type TYPE. | |
331 | Optionally, fetch or set the return value via READBUF or | |
332 | WRITEBUF respectively using REGCACHE for the register | |
333 | values. */ | |
334 | ||
335 | static enum return_value_convention | |
6a3a010b | 336 | mt_return_value (struct gdbarch *gdbarch, struct value *function, |
c055b101 CV |
337 | struct type *type, struct regcache *regcache, |
338 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
61def6bd | 339 | { |
e17a4113 UW |
340 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
341 | ||
61def6bd KB |
342 | if (TYPE_LENGTH (type) > 4) |
343 | { | |
344 | /* Return values > 4 bytes are returned in memory, | |
345 | pointed to by R11. */ | |
346 | if (readbuf) | |
347 | { | |
348 | ULONGEST addr; | |
349 | ||
d031aafb | 350 | regcache_cooked_read_unsigned (regcache, MT_R11_REGNUM, &addr); |
61def6bd KB |
351 | read_memory (addr, readbuf, TYPE_LENGTH (type)); |
352 | } | |
353 | ||
354 | if (writebuf) | |
355 | { | |
356 | ULONGEST addr; | |
357 | ||
d031aafb | 358 | regcache_cooked_read_unsigned (regcache, MT_R11_REGNUM, &addr); |
61def6bd KB |
359 | write_memory (addr, writebuf, TYPE_LENGTH (type)); |
360 | } | |
361 | ||
362 | return RETURN_VALUE_ABI_RETURNS_ADDRESS; | |
363 | } | |
364 | else | |
365 | { | |
366 | if (readbuf) | |
367 | { | |
368 | ULONGEST temp; | |
369 | ||
370 | /* Return values of <= 4 bytes are returned in R11. */ | |
d031aafb | 371 | regcache_cooked_read_unsigned (regcache, MT_R11_REGNUM, &temp); |
e17a4113 UW |
372 | store_unsigned_integer (readbuf, TYPE_LENGTH (type), |
373 | byte_order, temp); | |
61def6bd KB |
374 | } |
375 | ||
376 | if (writebuf) | |
377 | { | |
378 | if (TYPE_LENGTH (type) < 4) | |
379 | { | |
380 | gdb_byte buf[4]; | |
381 | /* Add leading zeros to the value. */ | |
382 | memset (buf, 0, sizeof (buf)); | |
383 | memcpy (buf + sizeof (buf) - TYPE_LENGTH (type), | |
384 | writebuf, TYPE_LENGTH (type)); | |
d031aafb | 385 | regcache_cooked_write (regcache, MT_R11_REGNUM, buf); |
61def6bd KB |
386 | } |
387 | else /* (TYPE_LENGTH (type) == 4 */ | |
d031aafb | 388 | regcache_cooked_write (regcache, MT_R11_REGNUM, writebuf); |
61def6bd KB |
389 | } |
390 | ||
391 | return RETURN_VALUE_REGISTER_CONVENTION; | |
392 | } | |
393 | } | |
394 | ||
395 | /* If the input address, PC, is in a function prologue, return the | |
396 | address of the end of the prologue, otherwise return the input | |
397 | address. | |
398 | ||
399 | Note: PC is likely to be the function start, since this function | |
400 | is mainly used for advancing a breakpoint to the first line, or | |
401 | stepping to the first line when we have stepped into a function | |
402 | call. */ | |
403 | ||
404 | static CORE_ADDR | |
6093d2eb | 405 | mt_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) |
61def6bd | 406 | { |
e17a4113 | 407 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
61def6bd | 408 | CORE_ADDR func_addr = 0, func_end = 0; |
2c02bd72 | 409 | const char *func_name; |
61def6bd KB |
410 | unsigned long instr; |
411 | ||
412 | if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end)) | |
413 | { | |
414 | struct symtab_and_line sal; | |
415 | struct symbol *sym; | |
416 | ||
417 | /* Found a function. */ | |
835a09d9 | 418 | sym = lookup_symbol (func_name, NULL, VAR_DOMAIN, NULL).symbol; |
61def6bd KB |
419 | if (sym && SYMBOL_LANGUAGE (sym) != language_asm) |
420 | { | |
421 | /* Don't use this trick for assembly source files. */ | |
422 | sal = find_pc_line (func_addr, 0); | |
423 | ||
424 | if (sal.end && sal.end < func_end) | |
425 | { | |
426 | /* Found a line number, use it as end of prologue. */ | |
427 | return sal.end; | |
428 | } | |
429 | } | |
430 | } | |
431 | ||
432 | /* No function symbol, or no line symbol. Use prologue scanning method. */ | |
433 | for (;; pc += 4) | |
434 | { | |
e17a4113 | 435 | instr = read_memory_unsigned_integer (pc, 4, byte_order); |
61def6bd KB |
436 | if (instr == 0x12000000) /* nop */ |
437 | continue; | |
438 | if (instr == 0x12ddc000) /* copy sp into fp */ | |
439 | continue; | |
440 | instr >>= 16; | |
441 | if (instr == 0x05dd) /* subi sp, sp, imm */ | |
442 | continue; | |
443 | if (instr >= 0x43c0 && instr <= 0x43df) /* push */ | |
444 | continue; | |
445 | /* Not an obvious prologue instruction. */ | |
446 | break; | |
447 | } | |
448 | ||
449 | return pc; | |
450 | } | |
451 | ||
cd6c3b4f YQ |
452 | /* Implement the breakpoint_kind_from_pc gdbarch method. */ |
453 | ||
d19280ad YQ |
454 | static int |
455 | mt_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) | |
456 | { | |
457 | return 4; | |
458 | } | |
61def6bd | 459 | |
cd6c3b4f YQ |
460 | /* Implement the sw_breakpoint_from_kind gdbarch method. */ |
461 | ||
61def6bd | 462 | static const gdb_byte * |
d19280ad | 463 | mt_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size) |
61def6bd | 464 | { |
d19280ad YQ |
465 | /* The breakpoint instruction must be the same size as the smallest |
466 | instruction in the instruction set. | |
467 | ||
468 | The BP for ms1 is defined as 0x68000000 (BREAK). | |
469 | The BP for ms2 is defined as 0x69000000 (illegal). */ | |
3950dc3f NS |
470 | static gdb_byte ms1_breakpoint[] = { 0x68, 0, 0, 0 }; |
471 | static gdb_byte ms2_breakpoint[] = { 0x69, 0, 0, 0 }; | |
61def6bd | 472 | |
d19280ad YQ |
473 | *size = kind; |
474 | ||
67d57894 | 475 | if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2) |
3950dc3f | 476 | return ms2_breakpoint; |
d19280ad | 477 | |
3950dc3f | 478 | return ms1_breakpoint; |
61def6bd KB |
479 | } |
480 | ||
60e81fcc NS |
481 | /* Select the correct coprocessor register bank. Return the pseudo |
482 | regnum we really want to read. */ | |
483 | ||
484 | static int | |
485 | mt_select_coprocessor (struct gdbarch *gdbarch, | |
486 | struct regcache *regcache, int regno) | |
487 | { | |
e17a4113 | 488 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
60e81fcc NS |
489 | unsigned index, base; |
490 | gdb_byte copro[4]; | |
491 | ||
025bb325 | 492 | /* Get the copro pseudo regnum. */ |
60e81fcc | 493 | regcache_raw_read (regcache, MT_COPRO_REGNUM, copro); |
e17a4113 UW |
494 | base = ((extract_signed_integer (&copro[0], 2, byte_order) |
495 | * MT_COPRO_PSEUDOREG_DIM_2) | |
496 | + extract_signed_integer (&copro[2], 2, byte_order)); | |
60e81fcc NS |
497 | |
498 | regno -= MT_COPRO_PSEUDOREG_ARRAY; | |
499 | index = regno % MT_COPRO_PSEUDOREG_REGS; | |
500 | regno /= MT_COPRO_PSEUDOREG_REGS; | |
501 | if (base != regno) | |
502 | { | |
503 | /* Select the correct coprocessor register bank. Invalidate the | |
504 | coprocessor register cache. */ | |
505 | unsigned ix; | |
506 | ||
e17a4113 UW |
507 | store_signed_integer (&copro[0], 2, byte_order, |
508 | regno / MT_COPRO_PSEUDOREG_DIM_2); | |
509 | store_signed_integer (&copro[2], 2, byte_order, | |
510 | regno % MT_COPRO_PSEUDOREG_DIM_2); | |
60e81fcc NS |
511 | regcache_raw_write (regcache, MT_COPRO_REGNUM, copro); |
512 | ||
513 | /* We must flush the cache, as it is now invalid. */ | |
514 | for (ix = MT_NUM_CPU_REGS; ix != MT_NUM_REGS; ix++) | |
9c5ea4d9 | 515 | regcache_invalidate (regcache, ix); |
60e81fcc NS |
516 | } |
517 | ||
518 | return index; | |
519 | } | |
520 | ||
61def6bd KB |
521 | /* Fetch the pseudo registers: |
522 | ||
60e81fcc | 523 | There are two regular pseudo-registers: |
61def6bd KB |
524 | 1) The 'coprocessor' pseudo-register (which mirrors the |
525 | "real" coprocessor register sent by the target), and | |
526 | 2) The 'MAC' pseudo-register (which represents the union | |
527 | of the original 32 bit target MAC register and the new | |
60e81fcc NS |
528 | 8-bit extended-MAC register). |
529 | ||
530 | Additionally there is an array of coprocessor registers which track | |
531 | the coprocessor registers for each coprocessor. */ | |
61def6bd | 532 | |
05d1431c | 533 | static enum register_status |
d031aafb | 534 | mt_pseudo_register_read (struct gdbarch *gdbarch, |
05d1431c | 535 | struct regcache *regcache, int regno, gdb_byte *buf) |
61def6bd | 536 | { |
e17a4113 UW |
537 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
538 | ||
61def6bd KB |
539 | switch (regno) |
540 | { | |
d031aafb NS |
541 | case MT_COPRO_REGNUM: |
542 | case MT_COPRO_PSEUDOREG_REGNUM: | |
05d1431c | 543 | return regcache_raw_read (regcache, MT_COPRO_REGNUM, buf); |
d031aafb NS |
544 | case MT_MAC_REGNUM: |
545 | case MT_MAC_PSEUDOREG_REGNUM: | |
3950dc3f NS |
546 | if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2 |
547 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2) | |
61def6bd | 548 | { |
05d1431c | 549 | enum register_status status; |
61def6bd KB |
550 | ULONGEST oldmac = 0, ext_mac = 0; |
551 | ULONGEST newmac; | |
552 | ||
05d1431c PA |
553 | status = regcache_cooked_read_unsigned (regcache, MT_MAC_REGNUM, &oldmac); |
554 | if (status != REG_VALID) | |
555 | return status; | |
556 | ||
d031aafb | 557 | regcache_cooked_read_unsigned (regcache, MT_EXMAC_REGNUM, &ext_mac); |
05d1431c PA |
558 | if (status != REG_VALID) |
559 | return status; | |
560 | ||
61def6bd KB |
561 | newmac = |
562 | (oldmac & 0xffffffff) | ((long long) (ext_mac & 0xff) << 32); | |
e17a4113 | 563 | store_signed_integer (buf, 8, byte_order, newmac); |
05d1431c PA |
564 | |
565 | return REG_VALID; | |
61def6bd KB |
566 | } |
567 | else | |
05d1431c | 568 | return regcache_raw_read (regcache, MT_MAC_REGNUM, buf); |
61def6bd KB |
569 | break; |
570 | default: | |
60e81fcc NS |
571 | { |
572 | unsigned index = mt_select_coprocessor (gdbarch, regcache, regno); | |
573 | ||
03a73f77 | 574 | if (index == MT_COPRO_PSEUDOREG_MAC_REGNUM) |
05d1431c PA |
575 | return mt_pseudo_register_read (gdbarch, regcache, |
576 | MT_MAC_PSEUDOREG_REGNUM, buf); | |
60e81fcc | 577 | else if (index < MT_NUM_REGS - MT_CPR0_REGNUM) |
05d1431c PA |
578 | return regcache_raw_read (regcache, index + MT_CPR0_REGNUM, buf); |
579 | else | |
580 | /* ??? */ | |
581 | return REG_VALID; | |
60e81fcc | 582 | } |
61def6bd KB |
583 | break; |
584 | } | |
585 | } | |
586 | ||
587 | /* Write the pseudo registers: | |
588 | ||
d031aafb | 589 | Mt pseudo-registers are stored directly to the target. The |
61def6bd KB |
590 | 'coprocessor' register is special, because when it is modified, all |
591 | the other coprocessor regs must be flushed from the reg cache. */ | |
592 | ||
593 | static void | |
d031aafb | 594 | mt_pseudo_register_write (struct gdbarch *gdbarch, |
61def6bd KB |
595 | struct regcache *regcache, |
596 | int regno, const gdb_byte *buf) | |
597 | { | |
e17a4113 | 598 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
61def6bd KB |
599 | int i; |
600 | ||
601 | switch (regno) | |
602 | { | |
d031aafb NS |
603 | case MT_COPRO_REGNUM: |
604 | case MT_COPRO_PSEUDOREG_REGNUM: | |
605 | regcache_raw_write (regcache, MT_COPRO_REGNUM, buf); | |
606 | for (i = MT_NUM_CPU_REGS; i < MT_NUM_REGS; i++) | |
9c5ea4d9 | 607 | regcache_invalidate (regcache, i); |
61def6bd | 608 | break; |
d031aafb NS |
609 | case MT_MAC_REGNUM: |
610 | case MT_MAC_PSEUDOREG_REGNUM: | |
3950dc3f NS |
611 | if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2 |
612 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2) | |
61def6bd KB |
613 | { |
614 | /* The 8-byte MAC pseudo-register must be broken down into two | |
615 | 32-byte registers. */ | |
616 | unsigned int oldmac, ext_mac; | |
617 | ULONGEST newmac; | |
618 | ||
e17a4113 | 619 | newmac = extract_unsigned_integer (buf, 8, byte_order); |
61def6bd KB |
620 | oldmac = newmac & 0xffffffff; |
621 | ext_mac = (newmac >> 32) & 0xff; | |
d031aafb NS |
622 | regcache_cooked_write_unsigned (regcache, MT_MAC_REGNUM, oldmac); |
623 | regcache_cooked_write_unsigned (regcache, MT_EXMAC_REGNUM, ext_mac); | |
61def6bd KB |
624 | } |
625 | else | |
d031aafb | 626 | regcache_raw_write (regcache, MT_MAC_REGNUM, buf); |
61def6bd KB |
627 | break; |
628 | default: | |
60e81fcc NS |
629 | { |
630 | unsigned index = mt_select_coprocessor (gdbarch, regcache, regno); | |
631 | ||
03a73f77 | 632 | if (index == MT_COPRO_PSEUDOREG_MAC_REGNUM) |
60e81fcc | 633 | mt_pseudo_register_write (gdbarch, regcache, |
03a73f77 | 634 | MT_MAC_PSEUDOREG_REGNUM, buf); |
60e81fcc NS |
635 | else if (index < MT_NUM_REGS - MT_CPR0_REGNUM) |
636 | regcache_raw_write (regcache, index + MT_CPR0_REGNUM, buf); | |
637 | } | |
61def6bd KB |
638 | break; |
639 | } | |
640 | } | |
641 | ||
642 | static CORE_ADDR | |
d031aafb | 643 | mt_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp) |
61def6bd KB |
644 | { |
645 | /* Register size is 4 bytes. */ | |
646 | return align_down (sp, 4); | |
647 | } | |
648 | ||
649 | /* Implements the "info registers" command. When ``all'' is non-zero, | |
650 | the coprocessor registers will be printed in addition to the rest | |
651 | of the registers. */ | |
652 | ||
653 | static void | |
d031aafb | 654 | mt_registers_info (struct gdbarch *gdbarch, |
d93859e2 UW |
655 | struct ui_file *file, |
656 | struct frame_info *frame, int regnum, int all) | |
61def6bd | 657 | { |
e17a4113 UW |
658 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
659 | ||
61def6bd KB |
660 | if (regnum == -1) |
661 | { | |
662 | int lim; | |
663 | ||
d031aafb | 664 | lim = all ? MT_NUM_REGS : MT_NUM_CPU_REGS; |
61def6bd KB |
665 | |
666 | for (regnum = 0; regnum < lim; regnum++) | |
667 | { | |
668 | /* Don't display the Qchannel register since it will be displayed | |
669 | along with Ichannel. (See below.) */ | |
d031aafb | 670 | if (regnum == MT_QCHANNEL_REGNUM) |
61def6bd KB |
671 | continue; |
672 | ||
d031aafb | 673 | mt_registers_info (gdbarch, file, frame, regnum, all); |
61def6bd KB |
674 | |
675 | /* Display the Qchannel register immediately after Ichannel. */ | |
d031aafb NS |
676 | if (regnum == MT_ICHANNEL_REGNUM) |
677 | mt_registers_info (gdbarch, file, frame, MT_QCHANNEL_REGNUM, all); | |
61def6bd KB |
678 | } |
679 | } | |
680 | else | |
681 | { | |
d031aafb | 682 | if (regnum == MT_EXMAC_REGNUM) |
61def6bd | 683 | return; |
d031aafb | 684 | else if (regnum == MT_CONTEXT_REGNUM) |
61def6bd KB |
685 | { |
686 | /* Special output handling for 38-bit context register. */ | |
687 | unsigned char *buff; | |
870f88f7 | 688 | unsigned int i, regsize; |
61def6bd KB |
689 | |
690 | regsize = register_size (gdbarch, regnum); | |
691 | ||
224c3ddb | 692 | buff = (unsigned char *) alloca (regsize); |
61def6bd | 693 | |
ca9d61b9 | 694 | deprecated_frame_register_read (frame, regnum, buff); |
61def6bd | 695 | |
c9f4d572 | 696 | fputs_filtered (gdbarch_register_name |
d93859e2 | 697 | (gdbarch, regnum), file); |
c9f4d572 | 698 | print_spaces_filtered (15 - strlen (gdbarch_register_name |
d93859e2 | 699 | (gdbarch, regnum)), |
c9f4d572 | 700 | file); |
61def6bd KB |
701 | fputs_filtered ("0x", file); |
702 | ||
703 | for (i = 0; i < regsize; i++) | |
704 | fprintf_filtered (file, "%02x", (unsigned int) | |
e17a4113 | 705 | extract_unsigned_integer (buff + i, 1, byte_order)); |
61def6bd KB |
706 | fputs_filtered ("\t", file); |
707 | print_longest (file, 'd', 0, | |
e17a4113 | 708 | extract_unsigned_integer (buff, regsize, byte_order)); |
61def6bd KB |
709 | fputs_filtered ("\n", file); |
710 | } | |
d031aafb NS |
711 | else if (regnum == MT_COPRO_REGNUM |
712 | || regnum == MT_COPRO_PSEUDOREG_REGNUM) | |
61def6bd KB |
713 | { |
714 | /* Special output handling for the 'coprocessor' register. */ | |
79a45b7d | 715 | struct value_print_options opts; |
cc977dc7 | 716 | struct value *val; |
61def6bd | 717 | |
cc977dc7 | 718 | val = get_frame_register_value (frame, MT_COPRO_REGNUM); |
61def6bd | 719 | /* And print. */ |
d031aafb | 720 | regnum = MT_COPRO_PSEUDOREG_REGNUM; |
d93859e2 | 721 | fputs_filtered (gdbarch_register_name (gdbarch, regnum), |
c9f4d572 UW |
722 | file); |
723 | print_spaces_filtered (15 - strlen (gdbarch_register_name | |
d93859e2 | 724 | (gdbarch, regnum)), |
c9f4d572 | 725 | file); |
915dd369 | 726 | get_no_prettyformat_print_options (&opts); |
79a45b7d | 727 | opts.deref_ref = 1; |
cc977dc7 | 728 | val_print (register_type (gdbarch, regnum), |
cc977dc7 | 729 | 0, 0, file, 0, val, |
0e03807e | 730 | &opts, current_language); |
61def6bd KB |
731 | fputs_filtered ("\n", file); |
732 | } | |
d031aafb | 733 | else if (regnum == MT_MAC_REGNUM || regnum == MT_MAC_PSEUDOREG_REGNUM) |
61def6bd KB |
734 | { |
735 | ULONGEST oldmac, ext_mac, newmac; | |
58b78171 | 736 | gdb_byte buf[3 * sizeof (LONGEST)]; |
61def6bd KB |
737 | |
738 | /* Get the two "real" mac registers. */ | |
ca9d61b9 | 739 | deprecated_frame_register_read (frame, MT_MAC_REGNUM, buf); |
3950dc3f | 740 | oldmac = extract_unsigned_integer |
e17a4113 | 741 | (buf, register_size (gdbarch, MT_MAC_REGNUM), byte_order); |
58b78171 NS |
742 | if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_mrisc2 |
743 | || gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_ms2) | |
61def6bd | 744 | { |
ca9d61b9 | 745 | deprecated_frame_register_read (frame, MT_EXMAC_REGNUM, buf); |
3950dc3f | 746 | ext_mac = extract_unsigned_integer |
e17a4113 | 747 | (buf, register_size (gdbarch, MT_EXMAC_REGNUM), byte_order); |
61def6bd KB |
748 | } |
749 | else | |
750 | ext_mac = 0; | |
751 | ||
752 | /* Add them together. */ | |
753 | newmac = (oldmac & 0xffffffff) + ((ext_mac & 0xff) << 32); | |
754 | ||
755 | /* And print. */ | |
d031aafb | 756 | regnum = MT_MAC_PSEUDOREG_REGNUM; |
d93859e2 | 757 | fputs_filtered (gdbarch_register_name (gdbarch, regnum), |
c9f4d572 UW |
758 | file); |
759 | print_spaces_filtered (15 - strlen (gdbarch_register_name | |
d93859e2 | 760 | (gdbarch, regnum)), |
c9f4d572 | 761 | file); |
61def6bd KB |
762 | fputs_filtered ("0x", file); |
763 | print_longest (file, 'x', 0, newmac); | |
764 | fputs_filtered ("\t", file); | |
765 | print_longest (file, 'u', 0, newmac); | |
766 | fputs_filtered ("\n", file); | |
767 | } | |
768 | else | |
769 | default_print_registers_info (gdbarch, file, frame, regnum, all); | |
770 | } | |
771 | } | |
772 | ||
773 | /* Set up the callee's arguments for an inferior function call. The | |
774 | arguments are pushed on the stack or are placed in registers as | |
775 | appropriate. It also sets up the return address (which points to | |
776 | the call dummy breakpoint). | |
777 | ||
778 | Returns the updated (and aligned) stack pointer. */ | |
779 | ||
780 | static CORE_ADDR | |
d031aafb | 781 | mt_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
61def6bd KB |
782 | struct regcache *regcache, CORE_ADDR bp_addr, |
783 | int nargs, struct value **args, CORE_ADDR sp, | |
784 | int struct_return, CORE_ADDR struct_addr) | |
785 | { | |
786 | #define wordsize 4 | |
e17a4113 | 787 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d031aafb NS |
788 | gdb_byte buf[MT_MAX_STRUCT_SIZE]; |
789 | int argreg = MT_1ST_ARGREG; | |
61def6bd KB |
790 | int split_param_len = 0; |
791 | int stack_dest = sp; | |
792 | int slacklen; | |
793 | int typelen; | |
794 | int i, j; | |
795 | ||
d031aafb NS |
796 | /* First handle however many args we can fit into MT_1ST_ARGREG thru |
797 | MT_LAST_ARGREG. */ | |
798 | for (i = 0; i < nargs && argreg <= MT_LAST_ARGREG; i++) | |
61def6bd | 799 | { |
58b78171 | 800 | const gdb_byte *val; |
61def6bd KB |
801 | typelen = TYPE_LENGTH (value_type (args[i])); |
802 | switch (typelen) | |
803 | { | |
804 | case 1: | |
805 | case 2: | |
806 | case 3: | |
807 | case 4: | |
808 | regcache_cooked_write_unsigned (regcache, argreg++, | |
809 | extract_unsigned_integer | |
810 | (value_contents (args[i]), | |
e17a4113 | 811 | wordsize, byte_order)); |
61def6bd KB |
812 | break; |
813 | case 8: | |
814 | case 12: | |
815 | case 16: | |
816 | val = value_contents (args[i]); | |
817 | while (typelen > 0) | |
818 | { | |
d031aafb | 819 | if (argreg <= MT_LAST_ARGREG) |
61def6bd KB |
820 | { |
821 | /* This word of the argument is passed in a register. */ | |
822 | regcache_cooked_write_unsigned (regcache, argreg++, | |
823 | extract_unsigned_integer | |
e17a4113 | 824 | (val, wordsize, byte_order)); |
61def6bd KB |
825 | typelen -= wordsize; |
826 | val += wordsize; | |
827 | } | |
828 | else | |
829 | { | |
830 | /* Remainder of this arg must be passed on the stack | |
831 | (deferred to do later). */ | |
832 | split_param_len = typelen; | |
833 | memcpy (buf, val, typelen); | |
834 | break; /* No more args can be handled in regs. */ | |
835 | } | |
836 | } | |
837 | break; | |
838 | default: | |
839 | /* By reverse engineering of gcc output, args bigger than | |
840 | 16 bytes go on the stack, and their address is passed | |
841 | in the argreg. */ | |
842 | stack_dest -= typelen; | |
843 | write_memory (stack_dest, value_contents (args[i]), typelen); | |
844 | regcache_cooked_write_unsigned (regcache, argreg++, stack_dest); | |
845 | break; | |
846 | } | |
847 | } | |
848 | ||
849 | /* Next, the rest of the arguments go onto the stack, in reverse order. */ | |
850 | for (j = nargs - 1; j >= i; j--) | |
851 | { | |
58b78171 | 852 | gdb_byte *val; |
ecfb0d68 SP |
853 | struct cleanup *back_to; |
854 | const gdb_byte *contents = value_contents (args[j]); | |
58b78171 | 855 | |
61def6bd KB |
856 | /* Right-justify the value in an aligned-length buffer. */ |
857 | typelen = TYPE_LENGTH (value_type (args[j])); | |
858 | slacklen = (wordsize - (typelen % wordsize)) % wordsize; | |
224c3ddb | 859 | val = (gdb_byte *) xmalloc (typelen + slacklen); |
ecfb0d68 SP |
860 | back_to = make_cleanup (xfree, val); |
861 | memcpy (val, contents, typelen); | |
61def6bd KB |
862 | memset (val + typelen, 0, slacklen); |
863 | /* Now write this data to the stack. */ | |
864 | stack_dest -= typelen + slacklen; | |
865 | write_memory (stack_dest, val, typelen + slacklen); | |
ecfb0d68 | 866 | do_cleanups (back_to); |
61def6bd KB |
867 | } |
868 | ||
869 | /* Finally, if a param needs to be split between registers and stack, | |
870 | write the second half to the stack now. */ | |
871 | if (split_param_len != 0) | |
872 | { | |
873 | stack_dest -= split_param_len; | |
874 | write_memory (stack_dest, buf, split_param_len); | |
875 | } | |
876 | ||
877 | /* Set up return address (provided to us as bp_addr). */ | |
d031aafb | 878 | regcache_cooked_write_unsigned (regcache, MT_RA_REGNUM, bp_addr); |
61def6bd KB |
879 | |
880 | /* Store struct return address, if given. */ | |
881 | if (struct_return && struct_addr != 0) | |
d031aafb | 882 | regcache_cooked_write_unsigned (regcache, MT_R11_REGNUM, struct_addr); |
61def6bd KB |
883 | |
884 | /* Set aside 16 bytes for the callee to save regs 1-4. */ | |
885 | stack_dest -= 16; | |
886 | ||
887 | /* Update the stack pointer. */ | |
d031aafb | 888 | regcache_cooked_write_unsigned (regcache, MT_SP_REGNUM, stack_dest); |
61def6bd KB |
889 | |
890 | /* And that should do it. Return the new stack pointer. */ | |
891 | return stack_dest; | |
892 | } | |
893 | ||
894 | ||
895 | /* The 'unwind_cache' data structure. */ | |
896 | ||
d031aafb | 897 | struct mt_unwind_cache |
61def6bd | 898 | { |
025bb325 | 899 | /* The previous frame's inner most stack address. |
61def6bd KB |
900 | Used as this frame ID's stack_addr. */ |
901 | CORE_ADDR prev_sp; | |
902 | CORE_ADDR frame_base; | |
903 | int framesize; | |
904 | int frameless_p; | |
905 | ||
906 | /* Table indicating the location of each and every register. */ | |
907 | struct trad_frame_saved_reg *saved_regs; | |
908 | }; | |
909 | ||
910 | /* Initialize an unwind_cache. Build up the saved_regs table etc. for | |
911 | the frame. */ | |
912 | ||
d031aafb | 913 | static struct mt_unwind_cache * |
94afd7a6 | 914 | mt_frame_unwind_cache (struct frame_info *this_frame, |
61def6bd KB |
915 | void **this_prologue_cache) |
916 | { | |
917 | struct gdbarch *gdbarch; | |
d031aafb | 918 | struct mt_unwind_cache *info; |
61def6bd KB |
919 | CORE_ADDR next_addr, start_addr, end_addr, prologue_end_addr; |
920 | unsigned long instr, upper_half, delayed_store = 0; | |
921 | int regnum, offset; | |
922 | ULONGEST sp, fp; | |
923 | ||
924 | if ((*this_prologue_cache)) | |
19ba03f4 | 925 | return (struct mt_unwind_cache *) (*this_prologue_cache); |
61def6bd | 926 | |
94afd7a6 | 927 | gdbarch = get_frame_arch (this_frame); |
d031aafb | 928 | info = FRAME_OBSTACK_ZALLOC (struct mt_unwind_cache); |
61def6bd KB |
929 | (*this_prologue_cache) = info; |
930 | ||
931 | info->prev_sp = 0; | |
932 | info->framesize = 0; | |
933 | info->frame_base = 0; | |
934 | info->frameless_p = 1; | |
94afd7a6 | 935 | info->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
61def6bd | 936 | |
025bb325 | 937 | /* Grab the frame-relative values of SP and FP, needed below. |
61def6bd KB |
938 | The frame_saved_register function will find them on the |
939 | stack or in the registers as appropriate. */ | |
94afd7a6 UW |
940 | sp = get_frame_register_unsigned (this_frame, MT_SP_REGNUM); |
941 | fp = get_frame_register_unsigned (this_frame, MT_FP_REGNUM); | |
61def6bd | 942 | |
94afd7a6 | 943 | start_addr = get_frame_func (this_frame); |
61def6bd KB |
944 | |
945 | /* Return early if GDB couldn't find the function. */ | |
946 | if (start_addr == 0) | |
947 | return info; | |
948 | ||
94afd7a6 | 949 | end_addr = get_frame_pc (this_frame); |
d80b854b | 950 | prologue_end_addr = skip_prologue_using_sal (gdbarch, start_addr); |
61def6bd KB |
951 | if (end_addr == 0) |
952 | for (next_addr = start_addr; next_addr < end_addr; next_addr += 4) | |
953 | { | |
94afd7a6 | 954 | instr = get_frame_memory_unsigned (this_frame, next_addr, 4); |
025bb325 | 955 | if (delayed_store) /* Previous instr was a push. */ |
61def6bd KB |
956 | { |
957 | upper_half = delayed_store >> 16; | |
958 | regnum = upper_half & 0xf; | |
959 | offset = delayed_store & 0xffff; | |
960 | switch (upper_half & 0xfff0) | |
961 | { | |
025bb325 | 962 | case 0x43c0: /* push using frame pointer. */ |
61def6bd KB |
963 | info->saved_regs[regnum].addr = offset; |
964 | break; | |
025bb325 | 965 | case 0x43d0: /* push using stack pointer. */ |
61def6bd KB |
966 | info->saved_regs[regnum].addr = offset; |
967 | break; | |
968 | default: /* lint */ | |
969 | break; | |
970 | } | |
971 | delayed_store = 0; | |
972 | } | |
973 | ||
974 | switch (instr) | |
975 | { | |
976 | case 0x12000000: /* NO-OP */ | |
977 | continue; | |
978 | case 0x12ddc000: /* copy sp into fp */ | |
025bb325 MS |
979 | info->frameless_p = 0; /* Record that the frame |
980 | pointer is in use. */ | |
61def6bd KB |
981 | continue; |
982 | default: | |
983 | upper_half = instr >> 16; | |
984 | if (upper_half == 0x05dd || /* subi sp, sp, imm */ | |
985 | upper_half == 0x07dd) /* subui sp, sp, imm */ | |
986 | { | |
987 | /* Record the frame size. */ | |
988 | info->framesize = instr & 0xffff; | |
989 | continue; | |
990 | } | |
991 | if ((upper_half & 0xfff0) == 0x43c0 || /* frame push */ | |
992 | (upper_half & 0xfff0) == 0x43d0) /* stack push */ | |
993 | { | |
994 | /* Save this instruction, but don't record the | |
995 | pushed register as 'saved' until we see the | |
996 | next instruction. That's because of deferred stores | |
997 | on this target -- GDB won't be able to read the register | |
998 | from the stack until one instruction later. */ | |
999 | delayed_store = instr; | |
1000 | continue; | |
1001 | } | |
1002 | /* Not a prologue instruction. Is this the end of the prologue? | |
1003 | This is the most difficult decision; when to stop scanning. | |
1004 | ||
1005 | If we have no line symbol, then the best thing we can do | |
1006 | is to stop scanning when we encounter an instruction that | |
1007 | is not likely to be a part of the prologue. | |
1008 | ||
1009 | But if we do have a line symbol, then we should | |
1010 | keep scanning until we reach it (or we reach end_addr). */ | |
1011 | ||
1012 | if (prologue_end_addr && (prologue_end_addr > (next_addr + 4))) | |
025bb325 | 1013 | continue; /* Keep scanning, recording saved_regs etc. */ |
61def6bd | 1014 | else |
025bb325 | 1015 | break; /* Quit scanning: breakpoint can be set here. */ |
61def6bd KB |
1016 | } |
1017 | } | |
1018 | ||
1019 | /* Special handling for the "saved" address of the SP: | |
1020 | The SP is of course never saved on the stack at all, so | |
1021 | by convention what we put here is simply the previous | |
1022 | _value_ of the SP (as opposed to an address where the | |
1023 | previous value would have been pushed). This will also | |
1024 | give us the frame base address. */ | |
1025 | ||
1026 | if (info->frameless_p) | |
1027 | { | |
1028 | info->frame_base = sp + info->framesize; | |
1029 | info->prev_sp = sp + info->framesize; | |
1030 | } | |
1031 | else | |
1032 | { | |
1033 | info->frame_base = fp + info->framesize; | |
1034 | info->prev_sp = fp + info->framesize; | |
1035 | } | |
1036 | /* Save prev_sp in saved_regs as a value, not as an address. */ | |
d031aafb | 1037 | trad_frame_set_value (info->saved_regs, MT_SP_REGNUM, info->prev_sp); |
61def6bd KB |
1038 | |
1039 | /* Now convert frame offsets to actual addresses (not offsets). */ | |
d031aafb | 1040 | for (regnum = 0; regnum < MT_NUM_REGS; regnum++) |
61def6bd KB |
1041 | if (trad_frame_addr_p (info->saved_regs, regnum)) |
1042 | info->saved_regs[regnum].addr += info->frame_base - info->framesize; | |
1043 | ||
1044 | /* The call instruction moves the caller's PC in the callee's RA reg. | |
1045 | Since this is an unwind, do the reverse. Copy the location of RA | |
1046 | into PC (the address / regnum) so that a request for PC will be | |
1047 | converted into a request for the RA. */ | |
d031aafb | 1048 | info->saved_regs[MT_PC_REGNUM] = info->saved_regs[MT_RA_REGNUM]; |
61def6bd KB |
1049 | |
1050 | return info; | |
1051 | } | |
1052 | ||
1053 | static CORE_ADDR | |
d031aafb | 1054 | mt_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
61def6bd KB |
1055 | { |
1056 | ULONGEST pc; | |
1057 | ||
11411de3 | 1058 | pc = frame_unwind_register_unsigned (next_frame, MT_PC_REGNUM); |
61def6bd KB |
1059 | return pc; |
1060 | } | |
1061 | ||
1062 | static CORE_ADDR | |
d031aafb | 1063 | mt_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame) |
61def6bd KB |
1064 | { |
1065 | ULONGEST sp; | |
1066 | ||
11411de3 | 1067 | sp = frame_unwind_register_unsigned (next_frame, MT_SP_REGNUM); |
61def6bd KB |
1068 | return sp; |
1069 | } | |
1070 | ||
94afd7a6 UW |
1071 | /* Assuming THIS_FRAME is a dummy, return the frame ID of that dummy |
1072 | frame. The frame ID's base needs to match the TOS value saved by | |
1073 | save_dummy_frame_tos(), and the PC match the dummy frame's breakpoint. */ | |
61def6bd KB |
1074 | |
1075 | static struct frame_id | |
94afd7a6 | 1076 | mt_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
61def6bd | 1077 | { |
94afd7a6 UW |
1078 | CORE_ADDR sp = get_frame_register_unsigned (this_frame, MT_SP_REGNUM); |
1079 | return frame_id_build (sp, get_frame_pc (this_frame)); | |
61def6bd KB |
1080 | } |
1081 | ||
1082 | /* Given a GDB frame, determine the address of the calling function's | |
1083 | frame. This will be used to create a new GDB frame struct. */ | |
1084 | ||
1085 | static void | |
94afd7a6 | 1086 | mt_frame_this_id (struct frame_info *this_frame, |
61def6bd KB |
1087 | void **this_prologue_cache, struct frame_id *this_id) |
1088 | { | |
d031aafb | 1089 | struct mt_unwind_cache *info = |
94afd7a6 | 1090 | mt_frame_unwind_cache (this_frame, this_prologue_cache); |
61def6bd KB |
1091 | |
1092 | if (!(info == NULL || info->prev_sp == 0)) | |
94afd7a6 | 1093 | (*this_id) = frame_id_build (info->prev_sp, get_frame_func (this_frame)); |
93d42b30 | 1094 | |
61def6bd KB |
1095 | return; |
1096 | } | |
1097 | ||
94afd7a6 UW |
1098 | static struct value * |
1099 | mt_frame_prev_register (struct frame_info *this_frame, | |
1100 | void **this_prologue_cache, int regnum) | |
61def6bd | 1101 | { |
d031aafb | 1102 | struct mt_unwind_cache *info = |
94afd7a6 | 1103 | mt_frame_unwind_cache (this_frame, this_prologue_cache); |
61def6bd | 1104 | |
94afd7a6 | 1105 | return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum); |
61def6bd KB |
1106 | } |
1107 | ||
1108 | static CORE_ADDR | |
94afd7a6 | 1109 | mt_frame_base_address (struct frame_info *this_frame, |
61def6bd KB |
1110 | void **this_prologue_cache) |
1111 | { | |
d031aafb | 1112 | struct mt_unwind_cache *info = |
94afd7a6 | 1113 | mt_frame_unwind_cache (this_frame, this_prologue_cache); |
61def6bd KB |
1114 | |
1115 | return info->frame_base; | |
1116 | } | |
1117 | ||
1118 | /* This is a shared interface: the 'frame_unwind' object is what's | |
1119 | returned by the 'sniffer' function, and in turn specifies how to | |
1120 | get a frame's ID and prev_regs. | |
1121 | ||
1122 | This exports the 'prev_register' and 'this_id' methods. */ | |
1123 | ||
d031aafb | 1124 | static const struct frame_unwind mt_frame_unwind = { |
61def6bd | 1125 | NORMAL_FRAME, |
8fbca658 | 1126 | default_frame_unwind_stop_reason, |
d031aafb | 1127 | mt_frame_this_id, |
94afd7a6 UW |
1128 | mt_frame_prev_register, |
1129 | NULL, | |
1130 | default_frame_sniffer | |
61def6bd KB |
1131 | }; |
1132 | ||
61def6bd KB |
1133 | /* Another shared interface: the 'frame_base' object specifies how to |
1134 | unwind a frame and secure the base addresses for frame objects | |
1135 | (locals, args). */ | |
1136 | ||
d031aafb NS |
1137 | static struct frame_base mt_frame_base = { |
1138 | &mt_frame_unwind, | |
1139 | mt_frame_base_address, | |
1140 | mt_frame_base_address, | |
1141 | mt_frame_base_address | |
61def6bd KB |
1142 | }; |
1143 | ||
1144 | static struct gdbarch * | |
d031aafb | 1145 | mt_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
61def6bd KB |
1146 | { |
1147 | struct gdbarch *gdbarch; | |
df4df182 | 1148 | struct gdbarch_tdep *tdep; |
61def6bd KB |
1149 | |
1150 | /* Find a candidate among the list of pre-declared architectures. */ | |
1151 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1152 | if (arches != NULL) | |
1153 | return arches->gdbarch; | |
1154 | ||
1155 | /* None found, create a new architecture from the information | |
1156 | provided. */ | |
fc270c35 | 1157 | tdep = XCNEW (struct gdbarch_tdep); |
df4df182 | 1158 | gdbarch = gdbarch_alloc (&info, tdep); |
61def6bd | 1159 | |
cb5c8c39 DJ |
1160 | set_gdbarch_float_format (gdbarch, floatformats_ieee_single); |
1161 | set_gdbarch_double_format (gdbarch, floatformats_ieee_double); | |
1162 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); | |
61def6bd | 1163 | |
d031aafb NS |
1164 | set_gdbarch_register_name (gdbarch, mt_register_name); |
1165 | set_gdbarch_num_regs (gdbarch, MT_NUM_REGS); | |
1166 | set_gdbarch_num_pseudo_regs (gdbarch, MT_NUM_PSEUDO_REGS); | |
1167 | set_gdbarch_pc_regnum (gdbarch, MT_PC_REGNUM); | |
1168 | set_gdbarch_sp_regnum (gdbarch, MT_SP_REGNUM); | |
1169 | set_gdbarch_pseudo_register_read (gdbarch, mt_pseudo_register_read); | |
1170 | set_gdbarch_pseudo_register_write (gdbarch, mt_pseudo_register_write); | |
1171 | set_gdbarch_skip_prologue (gdbarch, mt_skip_prologue); | |
61def6bd | 1172 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
04180708 YQ |
1173 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, mt_breakpoint_kind_from_pc); |
1174 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, mt_sw_breakpoint_from_kind); | |
61def6bd KB |
1175 | set_gdbarch_decr_pc_after_break (gdbarch, 0); |
1176 | set_gdbarch_frame_args_skip (gdbarch, 0); | |
d031aafb NS |
1177 | set_gdbarch_print_insn (gdbarch, print_insn_mt); |
1178 | set_gdbarch_register_type (gdbarch, mt_register_type); | |
1179 | set_gdbarch_register_reggroup_p (gdbarch, mt_register_reggroup_p); | |
61def6bd | 1180 | |
d031aafb NS |
1181 | set_gdbarch_return_value (gdbarch, mt_return_value); |
1182 | set_gdbarch_sp_regnum (gdbarch, MT_SP_REGNUM); | |
61def6bd | 1183 | |
d031aafb | 1184 | set_gdbarch_frame_align (gdbarch, mt_frame_align); |
61def6bd | 1185 | |
d031aafb | 1186 | set_gdbarch_print_registers_info (gdbarch, mt_registers_info); |
61def6bd | 1187 | |
d031aafb | 1188 | set_gdbarch_push_dummy_call (gdbarch, mt_push_dummy_call); |
61def6bd KB |
1189 | |
1190 | /* Target builtin data types. */ | |
1191 | set_gdbarch_short_bit (gdbarch, 16); | |
1192 | set_gdbarch_int_bit (gdbarch, 32); | |
1193 | set_gdbarch_long_bit (gdbarch, 32); | |
1194 | set_gdbarch_long_long_bit (gdbarch, 64); | |
1195 | set_gdbarch_float_bit (gdbarch, 32); | |
1196 | set_gdbarch_double_bit (gdbarch, 64); | |
1197 | set_gdbarch_long_double_bit (gdbarch, 64); | |
1198 | set_gdbarch_ptr_bit (gdbarch, 32); | |
1199 | ||
1200 | /* Register the DWARF 2 sniffer first, and then the traditional prologue | |
1201 | based sniffer. */ | |
94afd7a6 UW |
1202 | dwarf2_append_unwinders (gdbarch); |
1203 | frame_unwind_append_unwinder (gdbarch, &mt_frame_unwind); | |
d031aafb | 1204 | frame_base_set_default (gdbarch, &mt_frame_base); |
61def6bd KB |
1205 | |
1206 | /* Register the 'unwind_pc' method. */ | |
d031aafb NS |
1207 | set_gdbarch_unwind_pc (gdbarch, mt_unwind_pc); |
1208 | set_gdbarch_unwind_sp (gdbarch, mt_unwind_sp); | |
61def6bd | 1209 | |
025bb325 | 1210 | /* Methods for saving / extracting a dummy frame's ID. |
61def6bd KB |
1211 | The ID's stack address must match the SP value returned by |
1212 | PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */ | |
94afd7a6 | 1213 | set_gdbarch_dummy_id (gdbarch, mt_dummy_id); |
61def6bd KB |
1214 | |
1215 | return gdbarch; | |
1216 | } | |
1217 | ||
63807e1d PA |
1218 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1219 | extern initialize_file_ftype _initialize_mt_tdep; | |
1220 | ||
61def6bd | 1221 | void |
d031aafb | 1222 | _initialize_mt_tdep (void) |
61def6bd | 1223 | { |
d031aafb | 1224 | register_gdbarch_init (bfd_arch_mt, mt_gdbarch_init); |
61def6bd | 1225 | } |