Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. |
435e042a | 2 | Copyright 1996, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
c906108c SS |
24 | #include "target.h" |
25 | #include "value.h" | |
26 | #include "bfd.h" | |
27 | #include "gdb_string.h" | |
28 | #include "gdbcore.h" | |
29 | #include "symfile.h" | |
b4a20239 | 30 | #include "arch-utils.h" |
4e052eda | 31 | #include "regcache.h" |
435e042a | 32 | #include "symtab.h" |
c906108c | 33 | |
435e042a CV |
34 | struct gdbarch_tdep |
35 | { | |
36 | /* gdbarch target dependent data here. Currently unused for v850. */ | |
37 | }; | |
38 | ||
39 | /* Extra info which is saved in each frame_info. */ | |
40 | struct frame_extra_info | |
41 | { | |
42 | }; | |
c906108c | 43 | |
435e042a CV |
44 | enum { |
45 | E_R0_REGNUM, | |
46 | E_R1_REGNUM, | |
47 | E_R2_REGNUM, E_SAVE1_START_REGNUM = E_R2_REGNUM, E_SAVE1_END_REGNUM = E_R2_REGNUM, | |
48 | E_R3_REGNUM, E_SP_REGNUM = E_R3_REGNUM, | |
49 | E_R4_REGNUM, | |
50 | E_R5_REGNUM, | |
51 | E_R6_REGNUM, E_ARG0_REGNUM = E_R6_REGNUM, | |
52 | E_R7_REGNUM, | |
53 | E_R8_REGNUM, | |
54 | E_R9_REGNUM, E_ARGLAST_REGNUM = E_R9_REGNUM, | |
55 | E_R10_REGNUM, E_V0_REGNUM = E_R10_REGNUM, | |
56 | E_R11_REGNUM, E_V1_REGNUM = E_R11_REGNUM, | |
57 | E_R12_REGNUM, | |
58 | E_R13_REGNUM, | |
59 | E_R14_REGNUM, | |
60 | E_R15_REGNUM, | |
61 | E_R16_REGNUM, | |
62 | E_R17_REGNUM, | |
63 | E_R18_REGNUM, | |
64 | E_R19_REGNUM, | |
65 | E_R20_REGNUM, E_SAVE2_START_REGNUM = E_R20_REGNUM, | |
66 | E_R21_REGNUM, | |
67 | E_R22_REGNUM, | |
68 | E_R23_REGNUM, | |
69 | E_R24_REGNUM, | |
70 | E_R25_REGNUM, | |
71 | E_R26_REGNUM, | |
72 | E_R27_REGNUM, | |
73 | E_R28_REGNUM, | |
74 | E_R29_REGNUM, E_SAVE2_END_REGNUM = E_R29_REGNUM, E_FP_RAW_REGNUM = E_R29_REGNUM, | |
75 | E_R30_REGNUM, E_EP_REGNUM = E_R30_REGNUM, | |
76 | E_R31_REGNUM, E_SAVE3_START_REGNUM = E_R31_REGNUM, E_SAVE3_END_REGNUM = E_R31_REGNUM, E_RP_REGNUM = E_R31_REGNUM, | |
77 | E_R32_REGNUM, E_SR0_REGNUM = E_R32_REGNUM, | |
78 | E_R33_REGNUM, | |
79 | E_R34_REGNUM, | |
80 | E_R35_REGNUM, | |
81 | E_R36_REGNUM, | |
82 | E_R37_REGNUM, E_PS_REGNUM = E_R37_REGNUM, | |
83 | E_R38_REGNUM, | |
84 | E_R39_REGNUM, | |
85 | E_R40_REGNUM, | |
86 | E_R41_REGNUM, | |
87 | E_R42_REGNUM, | |
88 | E_R43_REGNUM, | |
89 | E_R44_REGNUM, | |
90 | E_R45_REGNUM, | |
91 | E_R46_REGNUM, | |
92 | E_R47_REGNUM, | |
93 | E_R48_REGNUM, | |
94 | E_R49_REGNUM, | |
95 | E_R50_REGNUM, | |
96 | E_R51_REGNUM, | |
97 | E_R52_REGNUM, E_CTBP_REGNUM = E_R52_REGNUM, | |
98 | E_R53_REGNUM, | |
99 | E_R54_REGNUM, | |
100 | E_R55_REGNUM, | |
101 | E_R56_REGNUM, | |
102 | E_R57_REGNUM, | |
103 | E_R58_REGNUM, | |
104 | E_R59_REGNUM, | |
105 | E_R60_REGNUM, | |
106 | E_R61_REGNUM, | |
107 | E_R62_REGNUM, | |
108 | E_R63_REGNUM, | |
109 | E_R64_REGNUM, E_PC_REGNUM = E_R64_REGNUM, | |
110 | E_R65_REGNUM, E_FP_REGNUM = E_R65_REGNUM, | |
111 | E_NUM_REGS | |
112 | }; | |
113 | ||
114 | enum | |
115 | { | |
116 | v850_reg_size = 4 | |
117 | }; | |
118 | ||
119 | /* Size of all registers as a whole. */ | |
120 | enum | |
121 | { | |
122 | E_ALL_REGS_SIZE = (E_NUM_REGS) * v850_reg_size | |
123 | }; | |
124 | ||
70eb15a4 CV |
125 | /* Size of return datatype which fits into all return registers. */ |
126 | enum | |
127 | { | |
128 | E_MAX_RETTYPE_SIZE_IN_REGS = 2 * v850_reg_size | |
129 | }; | |
130 | ||
435e042a CV |
131 | static LONGEST call_dummy_nil[] = {0}; |
132 | ||
133 | static char *v850_generic_reg_names[] = | |
134 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
135 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
136 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
137 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
138 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
139 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
140 | "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23", | |
141 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
142 | "pc", "fp" | |
143 | }; | |
c906108c SS |
144 | |
145 | static char *v850e_reg_names[] = | |
146 | { | |
147 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
148 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
149 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
150 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
151 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
152 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
153 | "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23", | |
154 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
155 | "pc", "fp" | |
156 | }; | |
157 | ||
158 | char **v850_register_names = v850_generic_reg_names; | |
159 | ||
160 | struct | |
c5aa993b JM |
161 | { |
162 | char **regnames; | |
163 | int mach; | |
164 | } | |
165 | v850_processor_type_table[] = | |
c906108c | 166 | { |
c5aa993b JM |
167 | { |
168 | v850_generic_reg_names, bfd_mach_v850 | |
169 | } | |
170 | , | |
171 | { | |
172 | v850e_reg_names, bfd_mach_v850e | |
173 | } | |
174 | , | |
175 | { | |
176 | v850e_reg_names, bfd_mach_v850ea | |
177 | } | |
178 | , | |
179 | { | |
180 | NULL, 0 | |
181 | } | |
c906108c SS |
182 | }; |
183 | ||
184 | /* Info gleaned from scanning a function's prologue. */ | |
185 | ||
186 | struct pifsr /* Info about one saved reg */ | |
c5aa993b JM |
187 | { |
188 | int framereg; /* Frame reg (SP or FP) */ | |
189 | int offset; /* Offset from framereg */ | |
190 | int cur_frameoffset; /* Current frameoffset */ | |
191 | int reg; /* Saved register number */ | |
192 | }; | |
c906108c SS |
193 | |
194 | struct prologue_info | |
c5aa993b JM |
195 | { |
196 | int framereg; | |
197 | int frameoffset; | |
198 | int start_function; | |
199 | struct pifsr *pifsrs; | |
200 | }; | |
c906108c | 201 | |
a14ed312 | 202 | static CORE_ADDR v850_scan_prologue (CORE_ADDR pc, struct prologue_info *fs); |
c906108c | 203 | |
435e042a CV |
204 | /* Function: v850_register_name |
205 | Returns the name of the v850/v850e register N. */ | |
206 | ||
fa88f677 | 207 | static const char * |
435e042a CV |
208 | v850_register_name (int regnum) |
209 | { | |
210 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
211 | internal_error (__FILE__, __LINE__, | |
212 | "v850_register_name: illegal register number %d", | |
213 | regnum); | |
214 | else | |
215 | return v850_register_names[regnum]; | |
216 | ||
217 | } | |
218 | ||
219 | /* Function: v850_register_byte | |
220 | Returns the byte position in the register cache for register N. */ | |
221 | ||
222 | static int | |
223 | v850_register_byte (int regnum) | |
224 | { | |
225 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
226 | internal_error (__FILE__, __LINE__, | |
227 | "v850_register_byte: illegal register number %d", | |
228 | regnum); | |
229 | else | |
230 | return regnum * v850_reg_size; | |
231 | } | |
232 | ||
233 | /* Function: v850_register_raw_size | |
234 | Returns the number of bytes occupied by the register on the target. */ | |
235 | ||
236 | static int | |
237 | v850_register_raw_size (int regnum) | |
238 | { | |
239 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
240 | internal_error (__FILE__, __LINE__, | |
241 | "v850_register_raw_size: illegal register number %d", | |
242 | regnum); | |
243 | /* Only the PC has 4 Byte, all other registers 2 Byte. */ | |
244 | else | |
245 | return v850_reg_size; | |
246 | } | |
247 | ||
248 | /* Function: v850_register_virtual_size | |
249 | Returns the number of bytes occupied by the register as represented | |
250 | internally by gdb. */ | |
251 | ||
252 | static int | |
253 | v850_register_virtual_size (int regnum) | |
254 | { | |
255 | return v850_register_raw_size (regnum); | |
256 | } | |
257 | ||
258 | /* Function: v850_reg_virtual_type | |
259 | Returns the default type for register N. */ | |
260 | ||
261 | static struct type * | |
262 | v850_reg_virtual_type (int regnum) | |
263 | { | |
264 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
265 | internal_error (__FILE__, __LINE__, | |
266 | "v850_register_virtual_type: illegal register number %d", | |
267 | regnum); | |
268 | else if (regnum == E_PC_REGNUM) | |
269 | return builtin_type_uint32; | |
270 | else | |
271 | return builtin_type_int32; | |
272 | } | |
c906108c | 273 | |
70eb15a4 CV |
274 | static int |
275 | v850_type_is_scalar (struct type *t) | |
276 | { | |
277 | return (TYPE_CODE (t) != TYPE_CODE_STRUCT | |
278 | && TYPE_CODE (t) != TYPE_CODE_UNION | |
279 | && TYPE_CODE (t) != TYPE_CODE_ARRAY); | |
280 | } | |
281 | ||
c906108c | 282 | /* Should call_function allocate stack space for a struct return? */ |
70eb15a4 | 283 | static int |
fba45db2 | 284 | v850_use_struct_convention (int gcc_p, struct type *type) |
c906108c | 285 | { |
70eb15a4 CV |
286 | /* According to ABI: |
287 | * return TYPE_LENGTH (type) > 8); | |
288 | */ | |
289 | ||
290 | /* Current implementation in gcc: */ | |
291 | ||
292 | int i; | |
293 | struct type *fld_type, *tgt_type; | |
294 | ||
295 | /* 1. The value is greater than 8 bytes -> returned by copying */ | |
296 | if (TYPE_LENGTH (type) > 8) | |
297 | return 1; | |
298 | ||
299 | /* 2. The value is a single basic type -> returned in register */ | |
300 | if (v850_type_is_scalar (type)) | |
301 | return 0; | |
302 | ||
303 | /* The value is a structure or union with a single element | |
304 | * and that element is either a single basic type or an array of | |
305 | * a single basic type whoes size is greater than or equal to 4 | |
306 | * -> returned in register */ | |
307 | if ((TYPE_CODE (type) == TYPE_CODE_STRUCT | |
308 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
309 | && TYPE_NFIELDS (type) == 1) | |
310 | { | |
311 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
312 | if (v850_type_is_scalar (fld_type) && TYPE_LENGTH (fld_type) >= 4) | |
313 | return 0; | |
314 | ||
315 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) | |
316 | { | |
317 | tgt_type = TYPE_TARGET_TYPE (fld_type); | |
318 | if (v850_type_is_scalar (tgt_type) && TYPE_LENGTH (tgt_type) >= 4) | |
319 | return 0; | |
320 | } | |
321 | } | |
322 | ||
323 | /* The value is a structure whose first element is an integer or | |
324 | * a float, and which contains no arrays of more than two elements | |
325 | * -> returned in register */ | |
326 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
327 | && v850_type_is_scalar (TYPE_FIELD_TYPE (type, 0)) | |
328 | && TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) == 4) | |
329 | { | |
330 | for (i = 1; i < TYPE_NFIELDS (type); ++i) | |
331 | { | |
332 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
333 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) | |
334 | { | |
335 | tgt_type = TYPE_TARGET_TYPE (fld_type); | |
336 | if (TYPE_LENGTH (fld_type) >= 0 && TYPE_LENGTH (tgt_type) >= 0 | |
337 | && TYPE_LENGTH (fld_type) / TYPE_LENGTH (tgt_type) > 2) | |
338 | return 1; | |
339 | } | |
340 | } | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* The value is a union which contains at least one field which | |
345 | * would be returned in registers according to these rules | |
346 | * -> returned in register */ | |
347 | if (TYPE_CODE (type) == TYPE_CODE_UNION) | |
348 | { | |
349 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
350 | { | |
351 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
352 | if (!v850_use_struct_convention (0, fld_type)) | |
353 | return 0; | |
354 | } | |
355 | } | |
356 | ||
357 | return 1; | |
c906108c | 358 | } |
c906108c SS |
359 | \f |
360 | ||
c5aa993b | 361 | |
c906108c | 362 | /* Structure for mapping bits in register lists to register numbers. */ |
c5aa993b | 363 | struct reg_list |
c906108c SS |
364 | { |
365 | long mask; | |
366 | int regno; | |
367 | }; | |
368 | ||
369 | /* Helper function for v850_scan_prologue to handle prepare instruction. */ | |
370 | ||
371 | static void | |
c5aa993b | 372 | handle_prepare (int insn, int insn2, CORE_ADDR * current_pc_ptr, |
c906108c | 373 | struct prologue_info *pi, struct pifsr **pifsr_ptr) |
c906108c SS |
374 | { |
375 | CORE_ADDR current_pc = *current_pc_ptr; | |
376 | struct pifsr *pifsr = *pifsr_ptr; | |
377 | long next = insn2 & 0xffff; | |
378 | long list12 = ((insn & 1) << 16) + (next & 0xffe0); | |
379 | long offset = (insn & 0x3e) << 1; | |
c5aa993b | 380 | static struct reg_list reg_table[] = |
c906108c | 381 | { |
c5aa993b JM |
382 | {0x00800, 20}, /* r20 */ |
383 | {0x00400, 21}, /* r21 */ | |
384 | {0x00200, 22}, /* r22 */ | |
385 | {0x00100, 23}, /* r23 */ | |
386 | {0x08000, 24}, /* r24 */ | |
387 | {0x04000, 25}, /* r25 */ | |
388 | {0x02000, 26}, /* r26 */ | |
389 | {0x01000, 27}, /* r27 */ | |
390 | {0x00080, 28}, /* r28 */ | |
391 | {0x00040, 29}, /* r29 */ | |
392 | {0x10000, 30}, /* ep */ | |
393 | {0x00020, 31}, /* lp */ | |
394 | {0, 0} /* end of table */ | |
c906108c SS |
395 | }; |
396 | int i; | |
397 | ||
c5aa993b | 398 | if ((next & 0x1f) == 0x0b) /* skip imm16 argument */ |
c906108c SS |
399 | current_pc += 2; |
400 | else if ((next & 0x1f) == 0x13) /* skip imm16 argument */ | |
401 | current_pc += 2; | |
402 | else if ((next & 0x1f) == 0x1b) /* skip imm32 argument */ | |
403 | current_pc += 4; | |
404 | ||
405 | /* Calculate the total size of the saved registers, and add it | |
406 | it to the immediate value used to adjust SP. */ | |
407 | for (i = 0; reg_table[i].mask != 0; i++) | |
408 | if (list12 & reg_table[i].mask) | |
435e042a | 409 | offset += v850_register_raw_size (reg_table[i].regno); |
c906108c SS |
410 | pi->frameoffset -= offset; |
411 | ||
412 | /* Calculate the offsets of the registers relative to the value | |
413 | the SP will have after the registers have been pushed and the | |
414 | imm5 value has been subtracted from it. */ | |
415 | if (pifsr) | |
416 | { | |
417 | for (i = 0; reg_table[i].mask != 0; i++) | |
418 | { | |
419 | if (list12 & reg_table[i].mask) | |
420 | { | |
421 | int reg = reg_table[i].regno; | |
435e042a | 422 | offset -= v850_register_raw_size (reg); |
c906108c SS |
423 | pifsr->reg = reg; |
424 | pifsr->offset = offset; | |
425 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 426 | #ifdef DEBUG |
c906108c | 427 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 428 | #endif |
c906108c SS |
429 | pifsr++; |
430 | } | |
431 | } | |
432 | } | |
433 | #ifdef DEBUG | |
434 | printf_filtered ("\tfound ctret after regsave func"); | |
435 | #endif | |
436 | ||
437 | /* Set result parameters. */ | |
438 | *current_pc_ptr = current_pc; | |
439 | *pifsr_ptr = pifsr; | |
440 | } | |
441 | ||
442 | ||
443 | /* Helper function for v850_scan_prologue to handle pushm/pushl instructions. | |
444 | FIXME: the SR bit of the register list is not supported; must check | |
445 | that the compiler does not ever generate this bit. */ | |
446 | ||
447 | static void | |
448 | handle_pushm (int insn, int insn2, struct prologue_info *pi, | |
c5aa993b | 449 | struct pifsr **pifsr_ptr) |
c906108c SS |
450 | { |
451 | struct pifsr *pifsr = *pifsr_ptr; | |
452 | long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0); | |
453 | long offset = 0; | |
c5aa993b | 454 | static struct reg_list pushml_reg_table[] = |
c906108c | 455 | { |
435e042a | 456 | {0x80000, E_PS_REGNUM}, /* PSW */ |
c5aa993b JM |
457 | {0x40000, 1}, /* r1 */ |
458 | {0x20000, 2}, /* r2 */ | |
459 | {0x10000, 3}, /* r3 */ | |
460 | {0x00800, 4}, /* r4 */ | |
461 | {0x00400, 5}, /* r5 */ | |
462 | {0x00200, 6}, /* r6 */ | |
463 | {0x00100, 7}, /* r7 */ | |
464 | {0x08000, 8}, /* r8 */ | |
465 | {0x04000, 9}, /* r9 */ | |
466 | {0x02000, 10}, /* r10 */ | |
467 | {0x01000, 11}, /* r11 */ | |
468 | {0x00080, 12}, /* r12 */ | |
469 | {0x00040, 13}, /* r13 */ | |
470 | {0x00020, 14}, /* r14 */ | |
471 | {0x00010, 15}, /* r15 */ | |
472 | {0, 0} /* end of table */ | |
c906108c | 473 | }; |
c5aa993b | 474 | static struct reg_list pushmh_reg_table[] = |
c906108c | 475 | { |
c5aa993b JM |
476 | {0x80000, 16}, /* r16 */ |
477 | {0x40000, 17}, /* r17 */ | |
478 | {0x20000, 18}, /* r18 */ | |
479 | {0x10000, 19}, /* r19 */ | |
480 | {0x00800, 20}, /* r20 */ | |
481 | {0x00400, 21}, /* r21 */ | |
482 | {0x00200, 22}, /* r22 */ | |
483 | {0x00100, 23}, /* r23 */ | |
484 | {0x08000, 24}, /* r24 */ | |
485 | {0x04000, 25}, /* r25 */ | |
486 | {0x02000, 26}, /* r26 */ | |
487 | {0x01000, 27}, /* r27 */ | |
488 | {0x00080, 28}, /* r28 */ | |
489 | {0x00040, 29}, /* r29 */ | |
490 | {0x00010, 30}, /* r30 */ | |
491 | {0x00020, 31}, /* r31 */ | |
492 | {0, 0} /* end of table */ | |
c906108c SS |
493 | }; |
494 | struct reg_list *reg_table; | |
495 | int i; | |
496 | ||
497 | /* Is this a pushml or a pushmh? */ | |
498 | if ((insn2 & 7) == 1) | |
499 | reg_table = pushml_reg_table; | |
500 | else | |
501 | reg_table = pushmh_reg_table; | |
502 | ||
503 | /* Calculate the total size of the saved registers, and add it | |
504 | it to the immediate value used to adjust SP. */ | |
505 | for (i = 0; reg_table[i].mask != 0; i++) | |
506 | if (list12 & reg_table[i].mask) | |
435e042a | 507 | offset += v850_register_raw_size (reg_table[i].regno); |
c906108c SS |
508 | pi->frameoffset -= offset; |
509 | ||
510 | /* Calculate the offsets of the registers relative to the value | |
511 | the SP will have after the registers have been pushed and the | |
512 | imm5 value is subtracted from it. */ | |
513 | if (pifsr) | |
514 | { | |
515 | for (i = 0; reg_table[i].mask != 0; i++) | |
516 | { | |
517 | if (list12 & reg_table[i].mask) | |
518 | { | |
519 | int reg = reg_table[i].regno; | |
435e042a | 520 | offset -= v850_register_raw_size (reg); |
c906108c SS |
521 | pifsr->reg = reg; |
522 | pifsr->offset = offset; | |
523 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 524 | #ifdef DEBUG |
c906108c | 525 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 526 | #endif |
c906108c SS |
527 | pifsr++; |
528 | } | |
529 | } | |
530 | } | |
531 | #ifdef DEBUG | |
532 | printf_filtered ("\tfound ctret after regsave func"); | |
533 | #endif | |
534 | ||
535 | /* Set result parameters. */ | |
536 | *pifsr_ptr = pifsr; | |
537 | } | |
c5aa993b | 538 | \f |
c906108c SS |
539 | |
540 | ||
541 | ||
c906108c SS |
542 | /* Function: scan_prologue |
543 | Scan the prologue of the function that contains PC, and record what | |
3a06899a CV |
544 | we find in PI. Returns the pc after the prologue. Note that the |
545 | addresses saved in frame->saved_regs are just frame relative (negative | |
546 | offsets from the frame pointer). This is because we don't know the | |
547 | actual value of the frame pointer yet. In some circumstances, the | |
548 | frame pointer can't be determined till after we have scanned the | |
549 | prologue. */ | |
c906108c SS |
550 | |
551 | static CORE_ADDR | |
fba45db2 | 552 | v850_scan_prologue (CORE_ADDR pc, struct prologue_info *pi) |
c906108c SS |
553 | { |
554 | CORE_ADDR func_addr, prologue_end, current_pc; | |
555 | struct pifsr *pifsr, *pifsr_tmp; | |
556 | int fp_used; | |
557 | int ep_used; | |
558 | int reg; | |
559 | CORE_ADDR save_pc, save_end; | |
560 | int regsave_func_p; | |
561 | int r12_tmp; | |
562 | ||
563 | /* First, figure out the bounds of the prologue so that we can limit the | |
564 | search to something reasonable. */ | |
565 | ||
566 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
567 | { | |
568 | struct symtab_and_line sal; | |
569 | ||
570 | sal = find_pc_line (func_addr, 0); | |
571 | ||
572 | if (func_addr == entry_point_address ()) | |
573 | pi->start_function = 1; | |
574 | else | |
575 | pi->start_function = 0; | |
576 | ||
577 | #if 0 | |
578 | if (sal.line == 0) | |
579 | prologue_end = pc; | |
580 | else | |
581 | prologue_end = sal.end; | |
582 | #else | |
583 | prologue_end = pc; | |
584 | #endif | |
585 | } | |
586 | else | |
587 | { /* We're in the boondocks */ | |
588 | func_addr = pc - 100; | |
589 | prologue_end = pc; | |
590 | } | |
591 | ||
592 | prologue_end = min (prologue_end, pc); | |
593 | ||
594 | /* Now, search the prologue looking for instructions that setup fp, save | |
595 | rp, adjust sp and such. We also record the frame offset of any saved | |
c5aa993b | 596 | registers. */ |
c906108c SS |
597 | |
598 | pi->frameoffset = 0; | |
435e042a | 599 | pi->framereg = E_SP_REGNUM; |
c906108c SS |
600 | fp_used = 0; |
601 | ep_used = 0; | |
602 | pifsr = pi->pifsrs; | |
603 | regsave_func_p = 0; | |
604 | save_pc = 0; | |
605 | save_end = 0; | |
606 | r12_tmp = 0; | |
607 | ||
608 | #ifdef DEBUG | |
609 | printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n", | |
c5aa993b | 610 | (long) func_addr, (long) prologue_end); |
c906108c SS |
611 | #endif |
612 | ||
c5aa993b | 613 | for (current_pc = func_addr; current_pc < prologue_end;) |
c906108c | 614 | { |
93d56215 AC |
615 | int insn; |
616 | int insn2 = -1; /* dummy value */ | |
c906108c SS |
617 | |
618 | #ifdef DEBUG | |
c5aa993b | 619 | printf_filtered ("0x%.8lx ", (long) current_pc); |
2bf0cb65 | 620 | TARGET_PRINT_INSN (current_pc, &tm_print_insn_info); |
c906108c SS |
621 | #endif |
622 | ||
623 | insn = read_memory_unsigned_integer (current_pc, 2); | |
624 | current_pc += 2; | |
c5aa993b | 625 | if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ |
c906108c SS |
626 | { |
627 | insn2 = read_memory_unsigned_integer (current_pc, 2); | |
628 | current_pc += 2; | |
629 | } | |
630 | ||
631 | if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) | |
632 | { /* jarl <func>,10 */ | |
c5aa993b | 633 | long low_disp = insn2 & ~(long) 1; |
c906108c | 634 | long disp = (((((insn & 0x3f) << 16) + low_disp) |
c5aa993b | 635 | & ~(long) 1) ^ 0x00200000) - 0x00200000; |
c906108c SS |
636 | |
637 | save_pc = current_pc; | |
638 | save_end = prologue_end; | |
639 | regsave_func_p = 1; | |
640 | current_pc += disp - 4; | |
641 | prologue_end = (current_pc | |
642 | + (2 * 3) /* moves to/from ep */ | |
c5aa993b JM |
643 | + 4 /* addi <const>,sp,sp */ |
644 | + 2 /* jmp [r10] */ | |
c906108c SS |
645 | + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ |
646 | + 20); /* slop area */ | |
647 | ||
648 | #ifdef DEBUG | |
649 | printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n", | |
c5aa993b | 650 | disp, low_disp, (long) current_pc + 2); |
c906108c SS |
651 | #endif |
652 | continue; | |
653 | } | |
654 | else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p) | |
655 | { /* callt <imm6> */ | |
435e042a | 656 | long ctbp = read_register (E_CTBP_REGNUM); |
c906108c SS |
657 | long adr = ctbp + ((insn & 0x3f) << 1); |
658 | ||
659 | save_pc = current_pc; | |
660 | save_end = prologue_end; | |
661 | regsave_func_p = 1; | |
662 | current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff); | |
663 | prologue_end = (current_pc | |
664 | + (2 * 3) /* prepare list2,imm5,sp/imm */ | |
c5aa993b | 665 | + 4 /* ctret */ |
c906108c SS |
666 | + 20); /* slop area */ |
667 | ||
668 | #ifdef DEBUG | |
669 | printf_filtered ("\tfound callt, ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n", | |
c5aa993b | 670 | ctbp, adr, (long) current_pc); |
c906108c SS |
671 | #endif |
672 | continue; | |
673 | } | |
674 | else if ((insn & 0xffc0) == 0x0780) /* prepare list2,imm5 */ | |
675 | { | |
676 | handle_prepare (insn, insn2, ¤t_pc, pi, &pifsr); | |
677 | continue; | |
678 | } | |
679 | else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144) | |
680 | { /* ctret after processing register save function */ | |
681 | current_pc = save_pc; | |
682 | prologue_end = save_end; | |
683 | regsave_func_p = 0; | |
684 | #ifdef DEBUG | |
685 | printf_filtered ("\tfound ctret after regsave func"); | |
686 | #endif | |
687 | continue; | |
688 | } | |
689 | else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1) | |
690 | { /* pushml, pushmh */ | |
691 | handle_pushm (insn, insn2, pi, &pifsr); | |
692 | continue; | |
693 | } | |
694 | else if ((insn & 0xffe0) == 0x0060 && regsave_func_p) | |
695 | { /* jmp after processing register save function */ | |
696 | current_pc = save_pc; | |
697 | prologue_end = save_end; | |
698 | regsave_func_p = 0; | |
699 | #ifdef DEBUG | |
700 | printf_filtered ("\tfound jmp after regsave func"); | |
701 | #endif | |
702 | continue; | |
703 | } | |
704 | else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */ | |
705 | || (insn & 0xffe0) == 0x0060 /* jmp */ | |
706 | || (insn & 0x0780) == 0x0580) /* branch */ | |
707 | { | |
708 | #ifdef DEBUG | |
709 | printf_filtered ("\n"); | |
710 | #endif | |
c5aa993b | 711 | break; /* Ran into end of prologue */ |
c906108c SS |
712 | } |
713 | ||
435e042a | 714 | else if ((insn & 0xffe0) == ((E_SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */ |
c906108c | 715 | pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; |
435e042a | 716 | else if (insn == ((E_SP_REGNUM << 11) | 0x0600 | E_SP_REGNUM)) /* addi <imm>,sp,sp */ |
c906108c | 717 | pi->frameoffset += insn2; |
435e042a | 718 | else if (insn == ((E_FP_RAW_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,fp */ |
c906108c SS |
719 | { |
720 | fp_used = 1; | |
435e042a | 721 | pi->framereg = E_FP_RAW_REGNUM; |
c906108c SS |
722 | } |
723 | ||
435e042a | 724 | else if (insn == ((E_R12_REGNUM << 11) | 0x0640 | E_R0_REGNUM)) /* movhi hi(const),r0,r12 */ |
c906108c | 725 | r12_tmp = insn2 << 16; |
435e042a | 726 | else if (insn == ((E_R12_REGNUM << 11) | 0x0620 | E_R12_REGNUM)) /* movea lo(const),r12,r12 */ |
c906108c | 727 | r12_tmp += insn2; |
435e042a | 728 | else if (insn == ((E_SP_REGNUM << 11) | 0x01c0 | E_R12_REGNUM) && r12_tmp) /* add r12,sp */ |
c906108c | 729 | pi->frameoffset = r12_tmp; |
435e042a | 730 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,ep */ |
c906108c | 731 | ep_used = 1; |
435e042a | 732 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_R1_REGNUM)) /* mov r1,ep */ |
c906108c | 733 | ep_used = 0; |
435e042a | 734 | else if (((insn & 0x07ff) == (0x0760 | E_SP_REGNUM) /* st.w <reg>,<offset>[sp] */ |
c906108c | 735 | || (fp_used |
435e042a | 736 | && (insn & 0x07ff) == (0x0760 | E_FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */ |
c906108c | 737 | && pifsr |
435e042a CV |
738 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
739 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) | |
740 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) | |
c906108c SS |
741 | { |
742 | pifsr->reg = reg; | |
743 | pifsr->offset = insn2 & ~1; | |
744 | pifsr->cur_frameoffset = pi->frameoffset; | |
745 | #ifdef DEBUG | |
746 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
747 | #endif | |
748 | pifsr++; | |
749 | } | |
750 | ||
c5aa993b | 751 | else if (ep_used /* sst.w <reg>,<offset>[ep] */ |
c906108c SS |
752 | && ((insn & 0x0781) == 0x0501) |
753 | && pifsr | |
435e042a CV |
754 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
755 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) | |
756 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) | |
c906108c SS |
757 | { |
758 | pifsr->reg = reg; | |
759 | pifsr->offset = (insn & 0x007e) << 1; | |
760 | pifsr->cur_frameoffset = pi->frameoffset; | |
761 | #ifdef DEBUG | |
762 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
763 | #endif | |
764 | pifsr++; | |
765 | } | |
766 | ||
767 | #ifdef DEBUG | |
768 | printf_filtered ("\n"); | |
769 | #endif | |
770 | } | |
771 | ||
772 | if (pifsr) | |
773 | pifsr->framereg = 0; /* Tie off last entry */ | |
774 | ||
775 | /* Fix up any offsets to the final offset. If a frame pointer was created, use it | |
776 | instead of the stack pointer. */ | |
777 | for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++) | |
778 | { | |
779 | pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset; | |
780 | pifsr_tmp->framereg = pi->framereg; | |
781 | ||
782 | #ifdef DEBUG | |
783 | printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n", | |
c5aa993b | 784 | pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg); |
c906108c SS |
785 | #endif |
786 | } | |
787 | ||
788 | #ifdef DEBUG | |
789 | printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); | |
790 | #endif | |
791 | ||
792 | return current_pc; | |
793 | } | |
794 | ||
435e042a CV |
795 | /* Function: find_callers_reg |
796 | Find REGNUM on the stack. Otherwise, it's in an active register. | |
797 | One thing we might want to do here is to check REGNUM against the | |
798 | clobber mask, and somehow flag it as invalid if it isn't saved on | |
799 | the stack somewhere. This would provide a graceful failure mode | |
800 | when trying to get the value of caller-saves registers for an inner | |
801 | frame. */ | |
c906108c | 802 | |
435e042a CV |
803 | CORE_ADDR |
804 | v850_find_callers_reg (struct frame_info *fi, int regnum) | |
c906108c | 805 | { |
435e042a CV |
806 | for (; fi; fi = fi->next) |
807 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
808 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); | |
809 | else if (fi->saved_regs[regnum] != 0) | |
810 | return read_memory_unsigned_integer (fi->saved_regs[regnum], | |
811 | v850_register_raw_size (regnum)); | |
c906108c | 812 | |
435e042a | 813 | return read_register (regnum); |
c906108c SS |
814 | } |
815 | ||
816 | /* Function: frame_chain | |
817 | Figure out the frame prior to FI. Unfortunately, this involves | |
818 | scanning the prologue of the caller, which will also be done | |
819 | shortly by v850_init_extra_frame_info. For the dummy frame, we | |
820 | just return the stack pointer that was in use at the time the | |
821 | function call was made. */ | |
822 | ||
823 | CORE_ADDR | |
fba45db2 | 824 | v850_frame_chain (struct frame_info *fi) |
c906108c SS |
825 | { |
826 | struct prologue_info pi; | |
827 | CORE_ADDR callers_pc, fp; | |
828 | ||
829 | /* First, find out who called us */ | |
830 | callers_pc = FRAME_SAVED_PC (fi); | |
831 | /* If caller is a call-dummy, then our FP bears no relation to his FP! */ | |
435e042a | 832 | fp = v850_find_callers_reg (fi, E_FP_RAW_REGNUM); |
c5aa993b JM |
833 | if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) |
834 | return fp; /* caller is call-dummy: return oldest value of FP */ | |
c906108c SS |
835 | |
836 | /* Caller is NOT a call-dummy, so everything else should just work. | |
837 | Even if THIS frame is a call-dummy! */ | |
838 | pi.pifsrs = NULL; | |
839 | ||
840 | v850_scan_prologue (callers_pc, &pi); | |
841 | ||
842 | if (pi.start_function) | |
843 | return 0; /* Don't chain beyond the start function */ | |
844 | ||
435e042a | 845 | if (pi.framereg == E_FP_RAW_REGNUM) |
c906108c SS |
846 | return v850_find_callers_reg (fi, pi.framereg); |
847 | ||
848 | return fi->frame - pi.frameoffset; | |
849 | } | |
850 | ||
c906108c SS |
851 | /* Function: skip_prologue |
852 | Return the address of the first code past the prologue of the function. */ | |
853 | ||
854 | CORE_ADDR | |
fba45db2 | 855 | v850_skip_prologue (CORE_ADDR pc) |
c906108c SS |
856 | { |
857 | CORE_ADDR func_addr, func_end; | |
858 | ||
859 | /* See what the symbol table says */ | |
860 | ||
861 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
862 | { | |
863 | struct symtab_and_line sal; | |
864 | ||
865 | sal = find_pc_line (func_addr, 0); | |
866 | ||
867 | if (sal.line != 0 && sal.end < func_end) | |
868 | return sal.end; | |
869 | else | |
870 | /* Either there's no line info, or the line after the prologue is after | |
871 | the end of the function. In this case, there probably isn't a | |
872 | prologue. */ | |
873 | return pc; | |
874 | } | |
875 | ||
876 | /* We can't find the start of this function, so there's nothing we can do. */ | |
877 | return pc; | |
878 | } | |
879 | ||
880 | /* Function: pop_frame | |
881 | This routine gets called when either the user uses the `return' | |
882 | command, or the call dummy breakpoint gets hit. */ | |
883 | ||
884 | void | |
435e042a | 885 | v850_pop_frame (void) |
c906108c | 886 | { |
435e042a | 887 | struct frame_info *frame = get_current_frame (); |
c906108c SS |
888 | int regnum; |
889 | ||
c5aa993b | 890 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
891 | generic_pop_dummy_frame (); |
892 | else | |
893 | { | |
435e042a | 894 | write_register (E_PC_REGNUM, FRAME_SAVED_PC (frame)); |
c906108c | 895 | |
435e042a | 896 | for (regnum = 0; regnum < E_NUM_REGS; regnum++) |
3a06899a | 897 | if (frame->saved_regs[regnum] != 0) |
c906108c | 898 | write_register (regnum, |
3a06899a | 899 | read_memory_unsigned_integer (frame->saved_regs[regnum], |
435e042a | 900 | v850_register_raw_size (regnum))); |
c906108c | 901 | |
435e042a | 902 | write_register (E_SP_REGNUM, FRAME_FP (frame)); |
c906108c SS |
903 | } |
904 | ||
905 | flush_cached_frames (); | |
906 | } | |
907 | ||
908 | /* Function: push_arguments | |
909 | Setup arguments and RP for a call to the target. First four args | |
910 | go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs | |
911 | are passed by reference. 64 bit quantities (doubles and long | |
912 | longs) may be split between the regs and the stack. When calling a | |
913 | function that returns a struct, a pointer to the struct is passed | |
914 | in as a secret first argument (always in R6). | |
915 | ||
916 | Stack space for the args has NOT been allocated: that job is up to us. | |
c5aa993b | 917 | */ |
c906108c SS |
918 | |
919 | CORE_ADDR | |
ea7c478f | 920 | v850_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
435e042a | 921 | int struct_return, CORE_ADDR struct_addr) |
c906108c SS |
922 | { |
923 | int argreg; | |
924 | int argnum; | |
925 | int len = 0; | |
926 | int stack_offset; | |
927 | ||
928 | /* First, just for safety, make sure stack is aligned */ | |
929 | sp &= ~3; | |
930 | ||
70eb15a4 CV |
931 | /* The offset onto the stack at which we will start copying parameters |
932 | (after the registers are used up) begins at 16 rather than at zero. | |
933 | I don't really know why, that's just the way it seems to work. */ | |
934 | stack_offset = 16; | |
935 | ||
c906108c SS |
936 | /* Now make space on the stack for the args. */ |
937 | for (argnum = 0; argnum < nargs; argnum++) | |
c5aa993b | 938 | len += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); |
70eb15a4 | 939 | sp -= len + stack_offset; /* possibly over-allocating, but it works... */ |
c5aa993b JM |
940 | /* (you might think we could allocate 16 bytes */ |
941 | /* less, but the ABI seems to use it all! ) */ | |
c906108c | 942 | |
70eb15a4 | 943 | argreg = E_ARG0_REGNUM; |
c906108c SS |
944 | /* the struct_return pointer occupies the first parameter-passing reg */ |
945 | if (struct_return) | |
70eb15a4 | 946 | argreg++; |
c906108c SS |
947 | |
948 | /* Now load as many as possible of the first arguments into | |
949 | registers, and push the rest onto the stack. There are 16 bytes | |
950 | in four registers available. Loop thru args from first to last. */ | |
951 | for (argnum = 0; argnum < nargs; argnum++) | |
952 | { | |
953 | int len; | |
954 | char *val; | |
435e042a | 955 | char valbuf[v850_register_raw_size (E_ARG0_REGNUM)]; |
c906108c | 956 | |
70eb15a4 CV |
957 | if (!v850_type_is_scalar (VALUE_TYPE (*args)) |
958 | && TYPE_LENGTH (VALUE_TYPE (*args)) > E_MAX_RETTYPE_SIZE_IN_REGS) | |
c906108c SS |
959 | { |
960 | store_address (valbuf, 4, VALUE_ADDRESS (*args)); | |
961 | len = 4; | |
962 | val = valbuf; | |
963 | } | |
964 | else | |
965 | { | |
966 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 967 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
968 | } |
969 | ||
970 | while (len > 0) | |
435e042a | 971 | if (argreg <= E_ARGLAST_REGNUM) |
c906108c SS |
972 | { |
973 | CORE_ADDR regval; | |
974 | ||
435e042a | 975 | regval = extract_address (val, v850_register_raw_size (argreg)); |
c906108c SS |
976 | write_register (argreg, regval); |
977 | ||
435e042a CV |
978 | len -= v850_register_raw_size (argreg); |
979 | val += v850_register_raw_size (argreg); | |
c906108c SS |
980 | argreg++; |
981 | } | |
982 | else | |
983 | { | |
984 | write_memory (sp + stack_offset, val, 4); | |
985 | ||
986 | len -= 4; | |
987 | val += 4; | |
988 | stack_offset += 4; | |
989 | } | |
990 | args++; | |
991 | } | |
992 | return sp; | |
993 | } | |
994 | ||
995 | /* Function: push_return_address (pc) | |
996 | Set up the return address for the inferior function call. | |
997 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 998 | |
c906108c | 999 | CORE_ADDR |
fba45db2 | 1000 | v850_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c | 1001 | { |
435e042a | 1002 | write_register (E_RP_REGNUM, CALL_DUMMY_ADDRESS ()); |
c906108c SS |
1003 | return sp; |
1004 | } | |
c5aa993b | 1005 | |
c906108c | 1006 | /* Function: frame_saved_pc |
435e042a | 1007 | Find the caller of this frame. We do this by seeing if E_RP_REGNUM |
c906108c SS |
1008 | is saved in the stack anywhere, otherwise we get it from the |
1009 | registers. If the inner frame is a dummy frame, return its PC | |
1010 | instead of RP, because that's where "caller" of the dummy-frame | |
1011 | will be found. */ | |
1012 | ||
1013 | CORE_ADDR | |
fba45db2 | 1014 | v850_frame_saved_pc (struct frame_info *fi) |
c906108c | 1015 | { |
c5aa993b | 1016 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
435e042a | 1017 | return generic_read_register_dummy (fi->pc, fi->frame, E_PC_REGNUM); |
c906108c | 1018 | else |
435e042a | 1019 | return v850_find_callers_reg (fi, E_RP_REGNUM); |
c906108c SS |
1020 | } |
1021 | ||
c906108c SS |
1022 | |
1023 | /* Function: fix_call_dummy | |
1024 | Pokes the callee function's address into the CALL_DUMMY assembly stub. | |
1025 | Assumes that the CALL_DUMMY looks like this: | |
c5aa993b JM |
1026 | jarl <offset24>, r31 |
1027 | trap | |
1028 | */ | |
c906108c | 1029 | |
435e042a | 1030 | void |
fba45db2 | 1031 | v850_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs, |
ea7c478f | 1032 | struct value **args, struct type *type, int gcc_p) |
c906108c SS |
1033 | { |
1034 | long offset24; | |
1035 | ||
1036 | offset24 = (long) fun - (long) entry_point_address (); | |
1037 | offset24 &= 0x3fffff; | |
1038 | offset24 |= 0xff800000; /* jarl <offset24>, r31 */ | |
1039 | ||
c5aa993b JM |
1040 | store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff); |
1041 | store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16); | |
435e042a CV |
1042 | } |
1043 | ||
1044 | static CORE_ADDR | |
1045 | v850_saved_pc_after_call (struct frame_info *ignore) | |
1046 | { | |
1047 | return read_register (E_RP_REGNUM); | |
1048 | } | |
1049 | ||
1050 | static void | |
1051 | v850_extract_return_value (struct type *type, char *regbuf, char *valbuf) | |
1052 | { | |
70eb15a4 CV |
1053 | CORE_ADDR return_buffer; |
1054 | ||
1055 | if (!v850_use_struct_convention (0, type)) | |
1056 | { | |
1057 | /* Scalar return values of <= 8 bytes are returned in | |
1058 | E_V0_REGNUM to E_V1_REGNUM. */ | |
1059 | memcpy (valbuf, | |
1060 | ®buf[REGISTER_BYTE (E_V0_REGNUM)], | |
1061 | TYPE_LENGTH (type)); | |
1062 | } | |
1063 | else | |
1064 | { | |
1065 | /* Aggregates and return values > 8 bytes are returned in memory, | |
1066 | pointed to by R6. */ | |
1067 | return_buffer = | |
1068 | extract_address (regbuf + REGISTER_BYTE (E_V0_REGNUM), | |
1069 | REGISTER_RAW_SIZE (E_V0_REGNUM)); | |
1070 | ||
1071 | read_memory (return_buffer, valbuf, TYPE_LENGTH (type)); | |
1072 | } | |
435e042a CV |
1073 | } |
1074 | ||
1075 | const static unsigned char * | |
1076 | v850_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
1077 | { | |
1078 | static unsigned char breakpoint[] = { 0x85, 0x05 }; | |
1079 | *lenptr = sizeof (breakpoint); | |
1080 | return breakpoint; | |
1081 | } | |
1082 | ||
1083 | static CORE_ADDR | |
1084 | v850_extract_struct_value_address (char *regbuf) | |
1085 | { | |
1086 | return extract_address (regbuf + v850_register_byte (E_V0_REGNUM), | |
1087 | v850_register_raw_size (E_V0_REGNUM)); | |
1088 | } | |
1089 | ||
1090 | static void | |
1091 | v850_store_return_value (struct type *type, char *valbuf) | |
1092 | { | |
70eb15a4 CV |
1093 | CORE_ADDR return_buffer; |
1094 | ||
1095 | if (!v850_use_struct_convention (0, type)) | |
1096 | write_register_bytes (REGISTER_BYTE (E_V0_REGNUM), valbuf, | |
1097 | TYPE_LENGTH (type)); | |
1098 | else | |
1099 | { | |
1100 | return_buffer = read_register (E_V0_REGNUM); | |
1101 | write_memory (return_buffer, valbuf, TYPE_LENGTH (type)); | |
1102 | } | |
435e042a CV |
1103 | } |
1104 | ||
1105 | static void | |
1106 | v850_frame_init_saved_regs (struct frame_info *fi) | |
1107 | { | |
1108 | struct prologue_info pi; | |
1109 | struct pifsr pifsrs[E_NUM_REGS + 1], *pifsr; | |
1110 | CORE_ADDR func_addr, func_end; | |
1111 | ||
1112 | if (!fi->saved_regs) | |
1113 | { | |
1114 | frame_saved_regs_zalloc (fi); | |
1115 | ||
1116 | /* The call dummy doesn't save any registers on the stack, so we | |
1117 | can return now. */ | |
1118 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
1119 | return; | |
1120 | ||
1121 | /* Find the beginning of this function, so we can analyze its | |
1122 | prologue. */ | |
1123 | if (find_pc_partial_function (fi->pc, NULL, &func_addr, &func_end)) | |
1124 | { | |
1125 | pi.pifsrs = pifsrs; | |
1126 | ||
1127 | v850_scan_prologue (fi->pc, &pi); | |
1128 | ||
1129 | if (!fi->next && pi.framereg == E_SP_REGNUM) | |
1130 | fi->frame = read_register (pi.framereg) - pi.frameoffset; | |
1131 | ||
1132 | for (pifsr = pifsrs; pifsr->framereg; pifsr++) | |
1133 | { | |
1134 | fi->saved_regs[pifsr->reg] = pifsr->offset + fi->frame; | |
1135 | ||
1136 | if (pifsr->framereg == E_SP_REGNUM) | |
1137 | fi->saved_regs[pifsr->reg] += pi.frameoffset; | |
1138 | } | |
1139 | } | |
1140 | /* Else we're out of luck (can't debug completely stripped code). | |
1141 | FIXME. */ | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | /* Function: init_extra_frame_info | |
1146 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
1147 | registers. Most of the work is done in scan_prologue(). | |
1148 | ||
1149 | Note that when we are called for the last frame (currently active frame), | |
1150 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
1151 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
1152 | always be correct (since that is derived from v850_frame_chain ()). | |
1153 | ||
1154 | We can be called with the PC in the call dummy under two circumstances. | |
1155 | First, during normal backtracing, second, while figuring out the frame | |
1156 | pointer just prior to calling the target function (see run_stack_dummy). */ | |
1157 | ||
1158 | static void | |
1159 | v850_init_extra_frame_info (int fromleaf, struct frame_info *fi) | |
1160 | { | |
1161 | struct prologue_info pi; | |
1162 | ||
1163 | if (fi->next) | |
1164 | fi->pc = FRAME_SAVED_PC (fi->next); | |
1165 | ||
1166 | v850_frame_init_saved_regs (fi); | |
1167 | } | |
1168 | ||
1169 | static void | |
70eb15a4 | 1170 | v850_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
435e042a | 1171 | { |
70eb15a4 | 1172 | write_register (E_ARG0_REGNUM, addr); |
435e042a CV |
1173 | } |
1174 | ||
1175 | static CORE_ADDR | |
1176 | v850_target_read_fp (void) | |
1177 | { | |
1178 | return read_register (E_FP_RAW_REGNUM); | |
c906108c SS |
1179 | } |
1180 | ||
6ed14b0e CV |
1181 | static struct gdbarch * |
1182 | v850_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
c906108c | 1183 | { |
435e042a | 1184 | static LONGEST call_dummy_words[1] = { 0 }; |
6ed14b0e CV |
1185 | struct gdbarch_tdep *tdep = NULL; |
1186 | struct gdbarch *gdbarch; | |
1187 | int i; | |
1188 | ||
1189 | /* find a candidate among the list of pre-declared architectures. */ | |
1190 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1191 | if (arches != NULL) | |
1192 | return (arches->gdbarch); | |
c906108c | 1193 | |
6ed14b0e CV |
1194 | #if 0 |
1195 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
1196 | #endif | |
1197 | ||
435e042a | 1198 | /* Change the register names based on the current machine type. */ |
6ed14b0e | 1199 | if (info.bfd_arch_info->arch != bfd_arch_v850) |
c906108c SS |
1200 | return 0; |
1201 | ||
6ed14b0e CV |
1202 | gdbarch = gdbarch_alloc (&info, 0); |
1203 | ||
c906108c SS |
1204 | for (i = 0; v850_processor_type_table[i].regnames != NULL; i++) |
1205 | { | |
6ed14b0e | 1206 | if (v850_processor_type_table[i].mach == info.bfd_arch_info->mach) |
435e042a CV |
1207 | { |
1208 | v850_register_names = v850_processor_type_table[i].regnames; | |
1209 | tm_print_insn_info.mach = info.bfd_arch_info->mach; | |
1210 | break; | |
1211 | } | |
c906108c SS |
1212 | } |
1213 | ||
435e042a CV |
1214 | /* |
1215 | * Basic register fields and methods. | |
1216 | */ | |
1217 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
1218 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
1219 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
1220 | set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM); | |
1221 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); | |
1222 | set_gdbarch_register_name (gdbarch, v850_register_name); | |
1223 | set_gdbarch_register_size (gdbarch, v850_reg_size); | |
1224 | set_gdbarch_register_bytes (gdbarch, E_ALL_REGS_SIZE); | |
1225 | set_gdbarch_register_byte (gdbarch, v850_register_byte); | |
1226 | set_gdbarch_register_raw_size (gdbarch, v850_register_raw_size); | |
1227 | set_gdbarch_max_register_raw_size (gdbarch, v850_reg_size); | |
1228 | set_gdbarch_register_virtual_size (gdbarch, v850_register_raw_size); | |
1229 | set_gdbarch_max_register_virtual_size (gdbarch, v850_reg_size); | |
1230 | set_gdbarch_register_virtual_type (gdbarch, v850_reg_virtual_type); | |
1231 | ||
1232 | set_gdbarch_read_fp (gdbarch, v850_target_read_fp); | |
1233 | ||
1234 | /* | |
1235 | * Frame Info | |
1236 | */ | |
1237 | set_gdbarch_init_extra_frame_info (gdbarch, v850_init_extra_frame_info); | |
1238 | set_gdbarch_frame_init_saved_regs (gdbarch, v850_frame_init_saved_regs); | |
1239 | set_gdbarch_frame_chain (gdbarch, v850_frame_chain); | |
b4743822 | 1240 | set_gdbarch_get_saved_register (gdbarch, generic_unwind_get_saved_register); |
435e042a CV |
1241 | set_gdbarch_saved_pc_after_call (gdbarch, v850_saved_pc_after_call); |
1242 | set_gdbarch_frame_saved_pc (gdbarch, v850_frame_saved_pc); | |
1243 | set_gdbarch_skip_prologue (gdbarch, v850_skip_prologue); | |
1244 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); | |
1245 | set_gdbarch_frame_args_address (gdbarch, default_frame_address); | |
1246 | set_gdbarch_frame_locals_address (gdbarch, default_frame_address); | |
1247 | ||
1248 | /* | |
1249 | * Miscelany | |
1250 | */ | |
1251 | /* Stack grows up. */ | |
1252 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
1253 | /* PC stops zero byte after a trap instruction | |
1254 | (which means: exactly on trap instruction). */ | |
1255 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
1256 | /* This value is almost never non-zero... */ | |
1257 | set_gdbarch_function_start_offset (gdbarch, 0); | |
1258 | /* This value is almost never non-zero... */ | |
1259 | set_gdbarch_frame_args_skip (gdbarch, 0); | |
1260 | /* OK to default this value to 'unknown'. */ | |
1261 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); | |
1262 | /* W/o prototype, coerce float args to double. */ | |
1263 | set_gdbarch_coerce_float_to_double (gdbarch, standard_coerce_float_to_double); | |
1264 | ||
1265 | /* | |
1266 | * Call Dummies | |
1267 | * | |
1268 | * These values and methods are used when gdb calls a target function. */ | |
1269 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); | |
1270 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); | |
1271 | set_gdbarch_push_return_address (gdbarch, v850_push_return_address); | |
26e9b323 | 1272 | set_gdbarch_deprecated_extract_return_value (gdbarch, v850_extract_return_value); |
435e042a CV |
1273 | set_gdbarch_push_arguments (gdbarch, v850_push_arguments); |
1274 | set_gdbarch_pop_frame (gdbarch, v850_pop_frame); | |
1275 | set_gdbarch_store_struct_return (gdbarch, v850_store_struct_return); | |
ebba8386 | 1276 | set_gdbarch_deprecated_store_return_value (gdbarch, v850_store_return_value); |
26e9b323 | 1277 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, v850_extract_struct_value_address); |
435e042a CV |
1278 | set_gdbarch_use_struct_convention (gdbarch, v850_use_struct_convention); |
1279 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); | |
1280 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); | |
1281 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); | |
1282 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); | |
1283 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); | |
1284 | set_gdbarch_call_dummy_length (gdbarch, 0); | |
1285 | set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy); | |
1286 | set_gdbarch_call_dummy_p (gdbarch, 1); | |
1287 | set_gdbarch_call_dummy_words (gdbarch, call_dummy_nil); | |
1288 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
1289 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
1290 | /* set_gdbarch_call_dummy_stack_adjust */ | |
1291 | set_gdbarch_fix_call_dummy (gdbarch, v850_fix_call_dummy); | |
1292 | set_gdbarch_breakpoint_from_pc (gdbarch, v850_breakpoint_from_pc); | |
1293 | ||
1294 | set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1295 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1296 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1297 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
1298 | ||
1299 | set_gdbarch_extra_stack_alignment_needed (gdbarch, 0); | |
1300 | ||
6ed14b0e | 1301 | return gdbarch; |
c906108c SS |
1302 | } |
1303 | ||
1304 | void | |
fba45db2 | 1305 | _initialize_v850_tdep (void) |
c906108c SS |
1306 | { |
1307 | tm_print_insn = print_insn_v850; | |
6ed14b0e | 1308 | register_gdbarch_init (bfd_arch_v850, v850_gdbarch_init); |
c906108c | 1309 | } |