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" | |
24 | #include "obstack.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
27 | #include "bfd.h" | |
28 | #include "gdb_string.h" | |
29 | #include "gdbcore.h" | |
30 | #include "symfile.h" | |
b4a20239 | 31 | #include "arch-utils.h" |
4e052eda | 32 | #include "regcache.h" |
435e042a | 33 | #include "symtab.h" |
c906108c | 34 | |
435e042a CV |
35 | struct gdbarch_tdep |
36 | { | |
37 | /* gdbarch target dependent data here. Currently unused for v850. */ | |
38 | }; | |
39 | ||
40 | /* Extra info which is saved in each frame_info. */ | |
41 | struct frame_extra_info | |
42 | { | |
43 | }; | |
c906108c | 44 | |
435e042a CV |
45 | enum { |
46 | E_R0_REGNUM, | |
47 | E_R1_REGNUM, | |
48 | E_R2_REGNUM, E_SAVE1_START_REGNUM = E_R2_REGNUM, E_SAVE1_END_REGNUM = E_R2_REGNUM, | |
49 | E_R3_REGNUM, E_SP_REGNUM = E_R3_REGNUM, | |
50 | E_R4_REGNUM, | |
51 | E_R5_REGNUM, | |
52 | E_R6_REGNUM, E_ARG0_REGNUM = E_R6_REGNUM, | |
53 | E_R7_REGNUM, | |
54 | E_R8_REGNUM, | |
55 | E_R9_REGNUM, E_ARGLAST_REGNUM = E_R9_REGNUM, | |
56 | E_R10_REGNUM, E_V0_REGNUM = E_R10_REGNUM, | |
57 | E_R11_REGNUM, E_V1_REGNUM = E_R11_REGNUM, | |
58 | E_R12_REGNUM, | |
59 | E_R13_REGNUM, | |
60 | E_R14_REGNUM, | |
61 | E_R15_REGNUM, | |
62 | E_R16_REGNUM, | |
63 | E_R17_REGNUM, | |
64 | E_R18_REGNUM, | |
65 | E_R19_REGNUM, | |
66 | E_R20_REGNUM, E_SAVE2_START_REGNUM = E_R20_REGNUM, | |
67 | E_R21_REGNUM, | |
68 | E_R22_REGNUM, | |
69 | E_R23_REGNUM, | |
70 | E_R24_REGNUM, | |
71 | E_R25_REGNUM, | |
72 | E_R26_REGNUM, | |
73 | E_R27_REGNUM, | |
74 | E_R28_REGNUM, | |
75 | E_R29_REGNUM, E_SAVE2_END_REGNUM = E_R29_REGNUM, E_FP_RAW_REGNUM = E_R29_REGNUM, | |
76 | E_R30_REGNUM, E_EP_REGNUM = E_R30_REGNUM, | |
77 | E_R31_REGNUM, E_SAVE3_START_REGNUM = E_R31_REGNUM, E_SAVE3_END_REGNUM = E_R31_REGNUM, E_RP_REGNUM = E_R31_REGNUM, | |
78 | E_R32_REGNUM, E_SR0_REGNUM = E_R32_REGNUM, | |
79 | E_R33_REGNUM, | |
80 | E_R34_REGNUM, | |
81 | E_R35_REGNUM, | |
82 | E_R36_REGNUM, | |
83 | E_R37_REGNUM, E_PS_REGNUM = E_R37_REGNUM, | |
84 | E_R38_REGNUM, | |
85 | E_R39_REGNUM, | |
86 | E_R40_REGNUM, | |
87 | E_R41_REGNUM, | |
88 | E_R42_REGNUM, | |
89 | E_R43_REGNUM, | |
90 | E_R44_REGNUM, | |
91 | E_R45_REGNUM, | |
92 | E_R46_REGNUM, | |
93 | E_R47_REGNUM, | |
94 | E_R48_REGNUM, | |
95 | E_R49_REGNUM, | |
96 | E_R50_REGNUM, | |
97 | E_R51_REGNUM, | |
98 | E_R52_REGNUM, E_CTBP_REGNUM = E_R52_REGNUM, | |
99 | E_R53_REGNUM, | |
100 | E_R54_REGNUM, | |
101 | E_R55_REGNUM, | |
102 | E_R56_REGNUM, | |
103 | E_R57_REGNUM, | |
104 | E_R58_REGNUM, | |
105 | E_R59_REGNUM, | |
106 | E_R60_REGNUM, | |
107 | E_R61_REGNUM, | |
108 | E_R62_REGNUM, | |
109 | E_R63_REGNUM, | |
110 | E_R64_REGNUM, E_PC_REGNUM = E_R64_REGNUM, | |
111 | E_R65_REGNUM, E_FP_REGNUM = E_R65_REGNUM, | |
112 | E_NUM_REGS | |
113 | }; | |
114 | ||
115 | enum | |
116 | { | |
117 | v850_reg_size = 4 | |
118 | }; | |
119 | ||
120 | /* Size of all registers as a whole. */ | |
121 | enum | |
122 | { | |
123 | E_ALL_REGS_SIZE = (E_NUM_REGS) * v850_reg_size | |
124 | }; | |
125 | ||
70eb15a4 CV |
126 | /* Size of return datatype which fits into all return registers. */ |
127 | enum | |
128 | { | |
129 | E_MAX_RETTYPE_SIZE_IN_REGS = 2 * v850_reg_size | |
130 | }; | |
131 | ||
435e042a CV |
132 | static LONGEST call_dummy_nil[] = {0}; |
133 | ||
134 | static char *v850_generic_reg_names[] = | |
135 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
136 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
137 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
138 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
139 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
140 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
141 | "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23", | |
142 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
143 | "pc", "fp" | |
144 | }; | |
c906108c SS |
145 | |
146 | static char *v850e_reg_names[] = | |
147 | { | |
148 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
149 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
150 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
151 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
152 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
153 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
154 | "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23", | |
155 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
156 | "pc", "fp" | |
157 | }; | |
158 | ||
159 | char **v850_register_names = v850_generic_reg_names; | |
160 | ||
161 | struct | |
c5aa993b JM |
162 | { |
163 | char **regnames; | |
164 | int mach; | |
165 | } | |
166 | v850_processor_type_table[] = | |
c906108c | 167 | { |
c5aa993b JM |
168 | { |
169 | v850_generic_reg_names, bfd_mach_v850 | |
170 | } | |
171 | , | |
172 | { | |
173 | v850e_reg_names, bfd_mach_v850e | |
174 | } | |
175 | , | |
176 | { | |
177 | v850e_reg_names, bfd_mach_v850ea | |
178 | } | |
179 | , | |
180 | { | |
181 | NULL, 0 | |
182 | } | |
c906108c SS |
183 | }; |
184 | ||
185 | /* Info gleaned from scanning a function's prologue. */ | |
186 | ||
187 | struct pifsr /* Info about one saved reg */ | |
c5aa993b JM |
188 | { |
189 | int framereg; /* Frame reg (SP or FP) */ | |
190 | int offset; /* Offset from framereg */ | |
191 | int cur_frameoffset; /* Current frameoffset */ | |
192 | int reg; /* Saved register number */ | |
193 | }; | |
c906108c SS |
194 | |
195 | struct prologue_info | |
c5aa993b JM |
196 | { |
197 | int framereg; | |
198 | int frameoffset; | |
199 | int start_function; | |
200 | struct pifsr *pifsrs; | |
201 | }; | |
c906108c | 202 | |
a14ed312 | 203 | static CORE_ADDR v850_scan_prologue (CORE_ADDR pc, struct prologue_info *fs); |
c906108c | 204 | |
435e042a CV |
205 | /* Function: v850_register_name |
206 | Returns the name of the v850/v850e register N. */ | |
207 | ||
fa88f677 | 208 | static const char * |
435e042a CV |
209 | v850_register_name (int regnum) |
210 | { | |
211 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
212 | internal_error (__FILE__, __LINE__, | |
213 | "v850_register_name: illegal register number %d", | |
214 | regnum); | |
215 | else | |
216 | return v850_register_names[regnum]; | |
217 | ||
218 | } | |
219 | ||
220 | /* Function: v850_register_byte | |
221 | Returns the byte position in the register cache for register N. */ | |
222 | ||
223 | static int | |
224 | v850_register_byte (int regnum) | |
225 | { | |
226 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
227 | internal_error (__FILE__, __LINE__, | |
228 | "v850_register_byte: illegal register number %d", | |
229 | regnum); | |
230 | else | |
231 | return regnum * v850_reg_size; | |
232 | } | |
233 | ||
234 | /* Function: v850_register_raw_size | |
235 | Returns the number of bytes occupied by the register on the target. */ | |
236 | ||
237 | static int | |
238 | v850_register_raw_size (int regnum) | |
239 | { | |
240 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
241 | internal_error (__FILE__, __LINE__, | |
242 | "v850_register_raw_size: illegal register number %d", | |
243 | regnum); | |
244 | /* Only the PC has 4 Byte, all other registers 2 Byte. */ | |
245 | else | |
246 | return v850_reg_size; | |
247 | } | |
248 | ||
249 | /* Function: v850_register_virtual_size | |
250 | Returns the number of bytes occupied by the register as represented | |
251 | internally by gdb. */ | |
252 | ||
253 | static int | |
254 | v850_register_virtual_size (int regnum) | |
255 | { | |
256 | return v850_register_raw_size (regnum); | |
257 | } | |
258 | ||
259 | /* Function: v850_reg_virtual_type | |
260 | Returns the default type for register N. */ | |
261 | ||
262 | static struct type * | |
263 | v850_reg_virtual_type (int regnum) | |
264 | { | |
265 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
266 | internal_error (__FILE__, __LINE__, | |
267 | "v850_register_virtual_type: illegal register number %d", | |
268 | regnum); | |
269 | else if (regnum == E_PC_REGNUM) | |
270 | return builtin_type_uint32; | |
271 | else | |
272 | return builtin_type_int32; | |
273 | } | |
c906108c | 274 | |
70eb15a4 CV |
275 | static int |
276 | v850_type_is_scalar (struct type *t) | |
277 | { | |
278 | return (TYPE_CODE (t) != TYPE_CODE_STRUCT | |
279 | && TYPE_CODE (t) != TYPE_CODE_UNION | |
280 | && TYPE_CODE (t) != TYPE_CODE_ARRAY); | |
281 | } | |
282 | ||
c906108c | 283 | /* Should call_function allocate stack space for a struct return? */ |
70eb15a4 | 284 | static int |
fba45db2 | 285 | v850_use_struct_convention (int gcc_p, struct type *type) |
c906108c | 286 | { |
70eb15a4 CV |
287 | /* According to ABI: |
288 | * return TYPE_LENGTH (type) > 8); | |
289 | */ | |
290 | ||
291 | /* Current implementation in gcc: */ | |
292 | ||
293 | int i; | |
294 | struct type *fld_type, *tgt_type; | |
295 | ||
296 | /* 1. The value is greater than 8 bytes -> returned by copying */ | |
297 | if (TYPE_LENGTH (type) > 8) | |
298 | return 1; | |
299 | ||
300 | /* 2. The value is a single basic type -> returned in register */ | |
301 | if (v850_type_is_scalar (type)) | |
302 | return 0; | |
303 | ||
304 | /* The value is a structure or union with a single element | |
305 | * and that element is either a single basic type or an array of | |
306 | * a single basic type whoes size is greater than or equal to 4 | |
307 | * -> returned in register */ | |
308 | if ((TYPE_CODE (type) == TYPE_CODE_STRUCT | |
309 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
310 | && TYPE_NFIELDS (type) == 1) | |
311 | { | |
312 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
313 | if (v850_type_is_scalar (fld_type) && TYPE_LENGTH (fld_type) >= 4) | |
314 | return 0; | |
315 | ||
316 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) | |
317 | { | |
318 | tgt_type = TYPE_TARGET_TYPE (fld_type); | |
319 | if (v850_type_is_scalar (tgt_type) && TYPE_LENGTH (tgt_type) >= 4) | |
320 | return 0; | |
321 | } | |
322 | } | |
323 | ||
324 | /* The value is a structure whose first element is an integer or | |
325 | * a float, and which contains no arrays of more than two elements | |
326 | * -> returned in register */ | |
327 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
328 | && v850_type_is_scalar (TYPE_FIELD_TYPE (type, 0)) | |
329 | && TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) == 4) | |
330 | { | |
331 | for (i = 1; i < TYPE_NFIELDS (type); ++i) | |
332 | { | |
333 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
334 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) | |
335 | { | |
336 | tgt_type = TYPE_TARGET_TYPE (fld_type); | |
337 | if (TYPE_LENGTH (fld_type) >= 0 && TYPE_LENGTH (tgt_type) >= 0 | |
338 | && TYPE_LENGTH (fld_type) / TYPE_LENGTH (tgt_type) > 2) | |
339 | return 1; | |
340 | } | |
341 | } | |
342 | return 0; | |
343 | } | |
344 | ||
345 | /* The value is a union which contains at least one field which | |
346 | * would be returned in registers according to these rules | |
347 | * -> returned in register */ | |
348 | if (TYPE_CODE (type) == TYPE_CODE_UNION) | |
349 | { | |
350 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
351 | { | |
352 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
353 | if (!v850_use_struct_convention (0, fld_type)) | |
354 | return 0; | |
355 | } | |
356 | } | |
357 | ||
358 | return 1; | |
c906108c | 359 | } |
c906108c SS |
360 | \f |
361 | ||
c5aa993b | 362 | |
c906108c | 363 | /* Structure for mapping bits in register lists to register numbers. */ |
c5aa993b | 364 | struct reg_list |
c906108c SS |
365 | { |
366 | long mask; | |
367 | int regno; | |
368 | }; | |
369 | ||
370 | /* Helper function for v850_scan_prologue to handle prepare instruction. */ | |
371 | ||
372 | static void | |
c5aa993b | 373 | handle_prepare (int insn, int insn2, CORE_ADDR * current_pc_ptr, |
c906108c | 374 | struct prologue_info *pi, struct pifsr **pifsr_ptr) |
c906108c SS |
375 | { |
376 | CORE_ADDR current_pc = *current_pc_ptr; | |
377 | struct pifsr *pifsr = *pifsr_ptr; | |
378 | long next = insn2 & 0xffff; | |
379 | long list12 = ((insn & 1) << 16) + (next & 0xffe0); | |
380 | long offset = (insn & 0x3e) << 1; | |
c5aa993b | 381 | static struct reg_list reg_table[] = |
c906108c | 382 | { |
c5aa993b JM |
383 | {0x00800, 20}, /* r20 */ |
384 | {0x00400, 21}, /* r21 */ | |
385 | {0x00200, 22}, /* r22 */ | |
386 | {0x00100, 23}, /* r23 */ | |
387 | {0x08000, 24}, /* r24 */ | |
388 | {0x04000, 25}, /* r25 */ | |
389 | {0x02000, 26}, /* r26 */ | |
390 | {0x01000, 27}, /* r27 */ | |
391 | {0x00080, 28}, /* r28 */ | |
392 | {0x00040, 29}, /* r29 */ | |
393 | {0x10000, 30}, /* ep */ | |
394 | {0x00020, 31}, /* lp */ | |
395 | {0, 0} /* end of table */ | |
c906108c SS |
396 | }; |
397 | int i; | |
398 | ||
c5aa993b | 399 | if ((next & 0x1f) == 0x0b) /* skip imm16 argument */ |
c906108c SS |
400 | current_pc += 2; |
401 | else if ((next & 0x1f) == 0x13) /* skip imm16 argument */ | |
402 | current_pc += 2; | |
403 | else if ((next & 0x1f) == 0x1b) /* skip imm32 argument */ | |
404 | current_pc += 4; | |
405 | ||
406 | /* Calculate the total size of the saved registers, and add it | |
407 | it to the immediate value used to adjust SP. */ | |
408 | for (i = 0; reg_table[i].mask != 0; i++) | |
409 | if (list12 & reg_table[i].mask) | |
435e042a | 410 | offset += v850_register_raw_size (reg_table[i].regno); |
c906108c SS |
411 | pi->frameoffset -= offset; |
412 | ||
413 | /* Calculate the offsets of the registers relative to the value | |
414 | the SP will have after the registers have been pushed and the | |
415 | imm5 value has been subtracted from it. */ | |
416 | if (pifsr) | |
417 | { | |
418 | for (i = 0; reg_table[i].mask != 0; i++) | |
419 | { | |
420 | if (list12 & reg_table[i].mask) | |
421 | { | |
422 | int reg = reg_table[i].regno; | |
435e042a | 423 | offset -= v850_register_raw_size (reg); |
c906108c SS |
424 | pifsr->reg = reg; |
425 | pifsr->offset = offset; | |
426 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 427 | #ifdef DEBUG |
c906108c | 428 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 429 | #endif |
c906108c SS |
430 | pifsr++; |
431 | } | |
432 | } | |
433 | } | |
434 | #ifdef DEBUG | |
435 | printf_filtered ("\tfound ctret after regsave func"); | |
436 | #endif | |
437 | ||
438 | /* Set result parameters. */ | |
439 | *current_pc_ptr = current_pc; | |
440 | *pifsr_ptr = pifsr; | |
441 | } | |
442 | ||
443 | ||
444 | /* Helper function for v850_scan_prologue to handle pushm/pushl instructions. | |
445 | FIXME: the SR bit of the register list is not supported; must check | |
446 | that the compiler does not ever generate this bit. */ | |
447 | ||
448 | static void | |
449 | handle_pushm (int insn, int insn2, struct prologue_info *pi, | |
c5aa993b | 450 | struct pifsr **pifsr_ptr) |
c906108c SS |
451 | { |
452 | struct pifsr *pifsr = *pifsr_ptr; | |
453 | long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0); | |
454 | long offset = 0; | |
c5aa993b | 455 | static struct reg_list pushml_reg_table[] = |
c906108c | 456 | { |
435e042a | 457 | {0x80000, E_PS_REGNUM}, /* PSW */ |
c5aa993b JM |
458 | {0x40000, 1}, /* r1 */ |
459 | {0x20000, 2}, /* r2 */ | |
460 | {0x10000, 3}, /* r3 */ | |
461 | {0x00800, 4}, /* r4 */ | |
462 | {0x00400, 5}, /* r5 */ | |
463 | {0x00200, 6}, /* r6 */ | |
464 | {0x00100, 7}, /* r7 */ | |
465 | {0x08000, 8}, /* r8 */ | |
466 | {0x04000, 9}, /* r9 */ | |
467 | {0x02000, 10}, /* r10 */ | |
468 | {0x01000, 11}, /* r11 */ | |
469 | {0x00080, 12}, /* r12 */ | |
470 | {0x00040, 13}, /* r13 */ | |
471 | {0x00020, 14}, /* r14 */ | |
472 | {0x00010, 15}, /* r15 */ | |
473 | {0, 0} /* end of table */ | |
c906108c | 474 | }; |
c5aa993b | 475 | static struct reg_list pushmh_reg_table[] = |
c906108c | 476 | { |
c5aa993b JM |
477 | {0x80000, 16}, /* r16 */ |
478 | {0x40000, 17}, /* r17 */ | |
479 | {0x20000, 18}, /* r18 */ | |
480 | {0x10000, 19}, /* r19 */ | |
481 | {0x00800, 20}, /* r20 */ | |
482 | {0x00400, 21}, /* r21 */ | |
483 | {0x00200, 22}, /* r22 */ | |
484 | {0x00100, 23}, /* r23 */ | |
485 | {0x08000, 24}, /* r24 */ | |
486 | {0x04000, 25}, /* r25 */ | |
487 | {0x02000, 26}, /* r26 */ | |
488 | {0x01000, 27}, /* r27 */ | |
489 | {0x00080, 28}, /* r28 */ | |
490 | {0x00040, 29}, /* r29 */ | |
491 | {0x00010, 30}, /* r30 */ | |
492 | {0x00020, 31}, /* r31 */ | |
493 | {0, 0} /* end of table */ | |
c906108c SS |
494 | }; |
495 | struct reg_list *reg_table; | |
496 | int i; | |
497 | ||
498 | /* Is this a pushml or a pushmh? */ | |
499 | if ((insn2 & 7) == 1) | |
500 | reg_table = pushml_reg_table; | |
501 | else | |
502 | reg_table = pushmh_reg_table; | |
503 | ||
504 | /* Calculate the total size of the saved registers, and add it | |
505 | it to the immediate value used to adjust SP. */ | |
506 | for (i = 0; reg_table[i].mask != 0; i++) | |
507 | if (list12 & reg_table[i].mask) | |
435e042a | 508 | offset += v850_register_raw_size (reg_table[i].regno); |
c906108c SS |
509 | pi->frameoffset -= offset; |
510 | ||
511 | /* Calculate the offsets of the registers relative to the value | |
512 | the SP will have after the registers have been pushed and the | |
513 | imm5 value is subtracted from it. */ | |
514 | if (pifsr) | |
515 | { | |
516 | for (i = 0; reg_table[i].mask != 0; i++) | |
517 | { | |
518 | if (list12 & reg_table[i].mask) | |
519 | { | |
520 | int reg = reg_table[i].regno; | |
435e042a | 521 | offset -= v850_register_raw_size (reg); |
c906108c SS |
522 | pifsr->reg = reg; |
523 | pifsr->offset = offset; | |
524 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 525 | #ifdef DEBUG |
c906108c | 526 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 527 | #endif |
c906108c SS |
528 | pifsr++; |
529 | } | |
530 | } | |
531 | } | |
532 | #ifdef DEBUG | |
533 | printf_filtered ("\tfound ctret after regsave func"); | |
534 | #endif | |
535 | ||
536 | /* Set result parameters. */ | |
537 | *pifsr_ptr = pifsr; | |
538 | } | |
c5aa993b | 539 | \f |
c906108c SS |
540 | |
541 | ||
542 | ||
c906108c SS |
543 | /* Function: scan_prologue |
544 | Scan the prologue of the function that contains PC, and record what | |
3a06899a CV |
545 | we find in PI. Returns the pc after the prologue. Note that the |
546 | addresses saved in frame->saved_regs are just frame relative (negative | |
547 | offsets from the frame pointer). This is because we don't know the | |
548 | actual value of the frame pointer yet. In some circumstances, the | |
549 | frame pointer can't be determined till after we have scanned the | |
550 | prologue. */ | |
c906108c SS |
551 | |
552 | static CORE_ADDR | |
fba45db2 | 553 | v850_scan_prologue (CORE_ADDR pc, struct prologue_info *pi) |
c906108c SS |
554 | { |
555 | CORE_ADDR func_addr, prologue_end, current_pc; | |
556 | struct pifsr *pifsr, *pifsr_tmp; | |
557 | int fp_used; | |
558 | int ep_used; | |
559 | int reg; | |
560 | CORE_ADDR save_pc, save_end; | |
561 | int regsave_func_p; | |
562 | int r12_tmp; | |
563 | ||
564 | /* First, figure out the bounds of the prologue so that we can limit the | |
565 | search to something reasonable. */ | |
566 | ||
567 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
568 | { | |
569 | struct symtab_and_line sal; | |
570 | ||
571 | sal = find_pc_line (func_addr, 0); | |
572 | ||
573 | if (func_addr == entry_point_address ()) | |
574 | pi->start_function = 1; | |
575 | else | |
576 | pi->start_function = 0; | |
577 | ||
578 | #if 0 | |
579 | if (sal.line == 0) | |
580 | prologue_end = pc; | |
581 | else | |
582 | prologue_end = sal.end; | |
583 | #else | |
584 | prologue_end = pc; | |
585 | #endif | |
586 | } | |
587 | else | |
588 | { /* We're in the boondocks */ | |
589 | func_addr = pc - 100; | |
590 | prologue_end = pc; | |
591 | } | |
592 | ||
593 | prologue_end = min (prologue_end, pc); | |
594 | ||
595 | /* Now, search the prologue looking for instructions that setup fp, save | |
596 | rp, adjust sp and such. We also record the frame offset of any saved | |
c5aa993b | 597 | registers. */ |
c906108c SS |
598 | |
599 | pi->frameoffset = 0; | |
435e042a | 600 | pi->framereg = E_SP_REGNUM; |
c906108c SS |
601 | fp_used = 0; |
602 | ep_used = 0; | |
603 | pifsr = pi->pifsrs; | |
604 | regsave_func_p = 0; | |
605 | save_pc = 0; | |
606 | save_end = 0; | |
607 | r12_tmp = 0; | |
608 | ||
609 | #ifdef DEBUG | |
610 | printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n", | |
c5aa993b | 611 | (long) func_addr, (long) prologue_end); |
c906108c SS |
612 | #endif |
613 | ||
c5aa993b | 614 | for (current_pc = func_addr; current_pc < prologue_end;) |
c906108c | 615 | { |
93d56215 AC |
616 | int insn; |
617 | int insn2 = -1; /* dummy value */ | |
c906108c SS |
618 | |
619 | #ifdef DEBUG | |
c5aa993b | 620 | printf_filtered ("0x%.8lx ", (long) current_pc); |
2bf0cb65 | 621 | TARGET_PRINT_INSN (current_pc, &tm_print_insn_info); |
c906108c SS |
622 | #endif |
623 | ||
624 | insn = read_memory_unsigned_integer (current_pc, 2); | |
625 | current_pc += 2; | |
c5aa993b | 626 | if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ |
c906108c SS |
627 | { |
628 | insn2 = read_memory_unsigned_integer (current_pc, 2); | |
629 | current_pc += 2; | |
630 | } | |
631 | ||
632 | if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) | |
633 | { /* jarl <func>,10 */ | |
c5aa993b | 634 | long low_disp = insn2 & ~(long) 1; |
c906108c | 635 | long disp = (((((insn & 0x3f) << 16) + low_disp) |
c5aa993b | 636 | & ~(long) 1) ^ 0x00200000) - 0x00200000; |
c906108c SS |
637 | |
638 | save_pc = current_pc; | |
639 | save_end = prologue_end; | |
640 | regsave_func_p = 1; | |
641 | current_pc += disp - 4; | |
642 | prologue_end = (current_pc | |
643 | + (2 * 3) /* moves to/from ep */ | |
c5aa993b JM |
644 | + 4 /* addi <const>,sp,sp */ |
645 | + 2 /* jmp [r10] */ | |
c906108c SS |
646 | + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ |
647 | + 20); /* slop area */ | |
648 | ||
649 | #ifdef DEBUG | |
650 | printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n", | |
c5aa993b | 651 | disp, low_disp, (long) current_pc + 2); |
c906108c SS |
652 | #endif |
653 | continue; | |
654 | } | |
655 | else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p) | |
656 | { /* callt <imm6> */ | |
435e042a | 657 | long ctbp = read_register (E_CTBP_REGNUM); |
c906108c SS |
658 | long adr = ctbp + ((insn & 0x3f) << 1); |
659 | ||
660 | save_pc = current_pc; | |
661 | save_end = prologue_end; | |
662 | regsave_func_p = 1; | |
663 | current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff); | |
664 | prologue_end = (current_pc | |
665 | + (2 * 3) /* prepare list2,imm5,sp/imm */ | |
c5aa993b | 666 | + 4 /* ctret */ |
c906108c SS |
667 | + 20); /* slop area */ |
668 | ||
669 | #ifdef DEBUG | |
670 | printf_filtered ("\tfound callt, ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n", | |
c5aa993b | 671 | ctbp, adr, (long) current_pc); |
c906108c SS |
672 | #endif |
673 | continue; | |
674 | } | |
675 | else if ((insn & 0xffc0) == 0x0780) /* prepare list2,imm5 */ | |
676 | { | |
677 | handle_prepare (insn, insn2, ¤t_pc, pi, &pifsr); | |
678 | continue; | |
679 | } | |
680 | else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144) | |
681 | { /* ctret after processing register save function */ | |
682 | current_pc = save_pc; | |
683 | prologue_end = save_end; | |
684 | regsave_func_p = 0; | |
685 | #ifdef DEBUG | |
686 | printf_filtered ("\tfound ctret after regsave func"); | |
687 | #endif | |
688 | continue; | |
689 | } | |
690 | else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1) | |
691 | { /* pushml, pushmh */ | |
692 | handle_pushm (insn, insn2, pi, &pifsr); | |
693 | continue; | |
694 | } | |
695 | else if ((insn & 0xffe0) == 0x0060 && regsave_func_p) | |
696 | { /* jmp after processing register save function */ | |
697 | current_pc = save_pc; | |
698 | prologue_end = save_end; | |
699 | regsave_func_p = 0; | |
700 | #ifdef DEBUG | |
701 | printf_filtered ("\tfound jmp after regsave func"); | |
702 | #endif | |
703 | continue; | |
704 | } | |
705 | else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */ | |
706 | || (insn & 0xffe0) == 0x0060 /* jmp */ | |
707 | || (insn & 0x0780) == 0x0580) /* branch */ | |
708 | { | |
709 | #ifdef DEBUG | |
710 | printf_filtered ("\n"); | |
711 | #endif | |
c5aa993b | 712 | break; /* Ran into end of prologue */ |
c906108c SS |
713 | } |
714 | ||
435e042a | 715 | else if ((insn & 0xffe0) == ((E_SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */ |
c906108c | 716 | pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; |
435e042a | 717 | else if (insn == ((E_SP_REGNUM << 11) | 0x0600 | E_SP_REGNUM)) /* addi <imm>,sp,sp */ |
c906108c | 718 | pi->frameoffset += insn2; |
435e042a | 719 | else if (insn == ((E_FP_RAW_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,fp */ |
c906108c SS |
720 | { |
721 | fp_used = 1; | |
435e042a | 722 | pi->framereg = E_FP_RAW_REGNUM; |
c906108c SS |
723 | } |
724 | ||
435e042a | 725 | else if (insn == ((E_R12_REGNUM << 11) | 0x0640 | E_R0_REGNUM)) /* movhi hi(const),r0,r12 */ |
c906108c | 726 | r12_tmp = insn2 << 16; |
435e042a | 727 | else if (insn == ((E_R12_REGNUM << 11) | 0x0620 | E_R12_REGNUM)) /* movea lo(const),r12,r12 */ |
c906108c | 728 | r12_tmp += insn2; |
435e042a | 729 | else if (insn == ((E_SP_REGNUM << 11) | 0x01c0 | E_R12_REGNUM) && r12_tmp) /* add r12,sp */ |
c906108c | 730 | pi->frameoffset = r12_tmp; |
435e042a | 731 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,ep */ |
c906108c | 732 | ep_used = 1; |
435e042a | 733 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_R1_REGNUM)) /* mov r1,ep */ |
c906108c | 734 | ep_used = 0; |
435e042a | 735 | else if (((insn & 0x07ff) == (0x0760 | E_SP_REGNUM) /* st.w <reg>,<offset>[sp] */ |
c906108c | 736 | || (fp_used |
435e042a | 737 | && (insn & 0x07ff) == (0x0760 | E_FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */ |
c906108c | 738 | && pifsr |
435e042a CV |
739 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
740 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) | |
741 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) | |
c906108c SS |
742 | { |
743 | pifsr->reg = reg; | |
744 | pifsr->offset = insn2 & ~1; | |
745 | pifsr->cur_frameoffset = pi->frameoffset; | |
746 | #ifdef DEBUG | |
747 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
748 | #endif | |
749 | pifsr++; | |
750 | } | |
751 | ||
c5aa993b | 752 | else if (ep_used /* sst.w <reg>,<offset>[ep] */ |
c906108c SS |
753 | && ((insn & 0x0781) == 0x0501) |
754 | && pifsr | |
435e042a CV |
755 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
756 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) | |
757 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) | |
c906108c SS |
758 | { |
759 | pifsr->reg = reg; | |
760 | pifsr->offset = (insn & 0x007e) << 1; | |
761 | pifsr->cur_frameoffset = pi->frameoffset; | |
762 | #ifdef DEBUG | |
763 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
764 | #endif | |
765 | pifsr++; | |
766 | } | |
767 | ||
768 | #ifdef DEBUG | |
769 | printf_filtered ("\n"); | |
770 | #endif | |
771 | } | |
772 | ||
773 | if (pifsr) | |
774 | pifsr->framereg = 0; /* Tie off last entry */ | |
775 | ||
776 | /* Fix up any offsets to the final offset. If a frame pointer was created, use it | |
777 | instead of the stack pointer. */ | |
778 | for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++) | |
779 | { | |
780 | pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset; | |
781 | pifsr_tmp->framereg = pi->framereg; | |
782 | ||
783 | #ifdef DEBUG | |
784 | printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n", | |
c5aa993b | 785 | pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg); |
c906108c SS |
786 | #endif |
787 | } | |
788 | ||
789 | #ifdef DEBUG | |
790 | printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); | |
791 | #endif | |
792 | ||
793 | return current_pc; | |
794 | } | |
795 | ||
435e042a CV |
796 | /* Function: find_callers_reg |
797 | Find REGNUM on the stack. Otherwise, it's in an active register. | |
798 | One thing we might want to do here is to check REGNUM against the | |
799 | clobber mask, and somehow flag it as invalid if it isn't saved on | |
800 | the stack somewhere. This would provide a graceful failure mode | |
801 | when trying to get the value of caller-saves registers for an inner | |
802 | frame. */ | |
c906108c | 803 | |
435e042a CV |
804 | CORE_ADDR |
805 | v850_find_callers_reg (struct frame_info *fi, int regnum) | |
c906108c | 806 | { |
435e042a CV |
807 | for (; fi; fi = fi->next) |
808 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
809 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); | |
810 | else if (fi->saved_regs[regnum] != 0) | |
811 | return read_memory_unsigned_integer (fi->saved_regs[regnum], | |
812 | v850_register_raw_size (regnum)); | |
c906108c | 813 | |
435e042a | 814 | return read_register (regnum); |
c906108c SS |
815 | } |
816 | ||
817 | /* Function: frame_chain | |
818 | Figure out the frame prior to FI. Unfortunately, this involves | |
819 | scanning the prologue of the caller, which will also be done | |
820 | shortly by v850_init_extra_frame_info. For the dummy frame, we | |
821 | just return the stack pointer that was in use at the time the | |
822 | function call was made. */ | |
823 | ||
824 | CORE_ADDR | |
fba45db2 | 825 | v850_frame_chain (struct frame_info *fi) |
c906108c SS |
826 | { |
827 | struct prologue_info pi; | |
828 | CORE_ADDR callers_pc, fp; | |
829 | ||
830 | /* First, find out who called us */ | |
831 | callers_pc = FRAME_SAVED_PC (fi); | |
832 | /* If caller is a call-dummy, then our FP bears no relation to his FP! */ | |
435e042a | 833 | fp = v850_find_callers_reg (fi, E_FP_RAW_REGNUM); |
c5aa993b JM |
834 | if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) |
835 | return fp; /* caller is call-dummy: return oldest value of FP */ | |
c906108c SS |
836 | |
837 | /* Caller is NOT a call-dummy, so everything else should just work. | |
838 | Even if THIS frame is a call-dummy! */ | |
839 | pi.pifsrs = NULL; | |
840 | ||
841 | v850_scan_prologue (callers_pc, &pi); | |
842 | ||
843 | if (pi.start_function) | |
844 | return 0; /* Don't chain beyond the start function */ | |
845 | ||
435e042a | 846 | if (pi.framereg == E_FP_RAW_REGNUM) |
c906108c SS |
847 | return v850_find_callers_reg (fi, pi.framereg); |
848 | ||
849 | return fi->frame - pi.frameoffset; | |
850 | } | |
851 | ||
c906108c SS |
852 | /* Function: skip_prologue |
853 | Return the address of the first code past the prologue of the function. */ | |
854 | ||
855 | CORE_ADDR | |
fba45db2 | 856 | v850_skip_prologue (CORE_ADDR pc) |
c906108c SS |
857 | { |
858 | CORE_ADDR func_addr, func_end; | |
859 | ||
860 | /* See what the symbol table says */ | |
861 | ||
862 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
863 | { | |
864 | struct symtab_and_line sal; | |
865 | ||
866 | sal = find_pc_line (func_addr, 0); | |
867 | ||
868 | if (sal.line != 0 && sal.end < func_end) | |
869 | return sal.end; | |
870 | else | |
871 | /* Either there's no line info, or the line after the prologue is after | |
872 | the end of the function. In this case, there probably isn't a | |
873 | prologue. */ | |
874 | return pc; | |
875 | } | |
876 | ||
877 | /* We can't find the start of this function, so there's nothing we can do. */ | |
878 | return pc; | |
879 | } | |
880 | ||
881 | /* Function: pop_frame | |
882 | This routine gets called when either the user uses the `return' | |
883 | command, or the call dummy breakpoint gets hit. */ | |
884 | ||
885 | void | |
435e042a | 886 | v850_pop_frame (void) |
c906108c | 887 | { |
435e042a | 888 | struct frame_info *frame = get_current_frame (); |
c906108c SS |
889 | int regnum; |
890 | ||
c5aa993b | 891 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
892 | generic_pop_dummy_frame (); |
893 | else | |
894 | { | |
435e042a | 895 | write_register (E_PC_REGNUM, FRAME_SAVED_PC (frame)); |
c906108c | 896 | |
435e042a | 897 | for (regnum = 0; regnum < E_NUM_REGS; regnum++) |
3a06899a | 898 | if (frame->saved_regs[regnum] != 0) |
c906108c | 899 | write_register (regnum, |
3a06899a | 900 | read_memory_unsigned_integer (frame->saved_regs[regnum], |
435e042a | 901 | v850_register_raw_size (regnum))); |
c906108c | 902 | |
435e042a | 903 | write_register (E_SP_REGNUM, FRAME_FP (frame)); |
c906108c SS |
904 | } |
905 | ||
906 | flush_cached_frames (); | |
907 | } | |
908 | ||
909 | /* Function: push_arguments | |
910 | Setup arguments and RP for a call to the target. First four args | |
911 | go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs | |
912 | are passed by reference. 64 bit quantities (doubles and long | |
913 | longs) may be split between the regs and the stack. When calling a | |
914 | function that returns a struct, a pointer to the struct is passed | |
915 | in as a secret first argument (always in R6). | |
916 | ||
917 | Stack space for the args has NOT been allocated: that job is up to us. | |
c5aa993b | 918 | */ |
c906108c SS |
919 | |
920 | CORE_ADDR | |
ea7c478f | 921 | v850_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
435e042a | 922 | int struct_return, CORE_ADDR struct_addr) |
c906108c SS |
923 | { |
924 | int argreg; | |
925 | int argnum; | |
926 | int len = 0; | |
927 | int stack_offset; | |
928 | ||
929 | /* First, just for safety, make sure stack is aligned */ | |
930 | sp &= ~3; | |
931 | ||
70eb15a4 CV |
932 | /* The offset onto the stack at which we will start copying parameters |
933 | (after the registers are used up) begins at 16 rather than at zero. | |
934 | I don't really know why, that's just the way it seems to work. */ | |
935 | stack_offset = 16; | |
936 | ||
c906108c SS |
937 | /* Now make space on the stack for the args. */ |
938 | for (argnum = 0; argnum < nargs; argnum++) | |
c5aa993b | 939 | len += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); |
70eb15a4 | 940 | sp -= len + stack_offset; /* possibly over-allocating, but it works... */ |
c5aa993b JM |
941 | /* (you might think we could allocate 16 bytes */ |
942 | /* less, but the ABI seems to use it all! ) */ | |
c906108c | 943 | |
70eb15a4 | 944 | argreg = E_ARG0_REGNUM; |
c906108c SS |
945 | /* the struct_return pointer occupies the first parameter-passing reg */ |
946 | if (struct_return) | |
70eb15a4 | 947 | argreg++; |
c906108c SS |
948 | |
949 | /* Now load as many as possible of the first arguments into | |
950 | registers, and push the rest onto the stack. There are 16 bytes | |
951 | in four registers available. Loop thru args from first to last. */ | |
952 | for (argnum = 0; argnum < nargs; argnum++) | |
953 | { | |
954 | int len; | |
955 | char *val; | |
435e042a | 956 | char valbuf[v850_register_raw_size (E_ARG0_REGNUM)]; |
c906108c | 957 | |
70eb15a4 CV |
958 | if (!v850_type_is_scalar (VALUE_TYPE (*args)) |
959 | && TYPE_LENGTH (VALUE_TYPE (*args)) > E_MAX_RETTYPE_SIZE_IN_REGS) | |
c906108c SS |
960 | { |
961 | store_address (valbuf, 4, VALUE_ADDRESS (*args)); | |
962 | len = 4; | |
963 | val = valbuf; | |
964 | } | |
965 | else | |
966 | { | |
967 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 968 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
969 | } |
970 | ||
971 | while (len > 0) | |
435e042a | 972 | if (argreg <= E_ARGLAST_REGNUM) |
c906108c SS |
973 | { |
974 | CORE_ADDR regval; | |
975 | ||
435e042a | 976 | regval = extract_address (val, v850_register_raw_size (argreg)); |
c906108c SS |
977 | write_register (argreg, regval); |
978 | ||
435e042a CV |
979 | len -= v850_register_raw_size (argreg); |
980 | val += v850_register_raw_size (argreg); | |
c906108c SS |
981 | argreg++; |
982 | } | |
983 | else | |
984 | { | |
985 | write_memory (sp + stack_offset, val, 4); | |
986 | ||
987 | len -= 4; | |
988 | val += 4; | |
989 | stack_offset += 4; | |
990 | } | |
991 | args++; | |
992 | } | |
993 | return sp; | |
994 | } | |
995 | ||
996 | /* Function: push_return_address (pc) | |
997 | Set up the return address for the inferior function call. | |
998 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 999 | |
c906108c | 1000 | CORE_ADDR |
fba45db2 | 1001 | v850_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c | 1002 | { |
435e042a | 1003 | write_register (E_RP_REGNUM, CALL_DUMMY_ADDRESS ()); |
c906108c SS |
1004 | return sp; |
1005 | } | |
c5aa993b | 1006 | |
c906108c | 1007 | /* Function: frame_saved_pc |
435e042a | 1008 | Find the caller of this frame. We do this by seeing if E_RP_REGNUM |
c906108c SS |
1009 | is saved in the stack anywhere, otherwise we get it from the |
1010 | registers. If the inner frame is a dummy frame, return its PC | |
1011 | instead of RP, because that's where "caller" of the dummy-frame | |
1012 | will be found. */ | |
1013 | ||
1014 | CORE_ADDR | |
fba45db2 | 1015 | v850_frame_saved_pc (struct frame_info *fi) |
c906108c | 1016 | { |
c5aa993b | 1017 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
435e042a | 1018 | return generic_read_register_dummy (fi->pc, fi->frame, E_PC_REGNUM); |
c906108c | 1019 | else |
435e042a | 1020 | return v850_find_callers_reg (fi, E_RP_REGNUM); |
c906108c SS |
1021 | } |
1022 | ||
c906108c SS |
1023 | |
1024 | /* Function: fix_call_dummy | |
1025 | Pokes the callee function's address into the CALL_DUMMY assembly stub. | |
1026 | Assumes that the CALL_DUMMY looks like this: | |
c5aa993b JM |
1027 | jarl <offset24>, r31 |
1028 | trap | |
1029 | */ | |
c906108c | 1030 | |
435e042a | 1031 | void |
fba45db2 | 1032 | v850_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs, |
ea7c478f | 1033 | struct value **args, struct type *type, int gcc_p) |
c906108c SS |
1034 | { |
1035 | long offset24; | |
1036 | ||
1037 | offset24 = (long) fun - (long) entry_point_address (); | |
1038 | offset24 &= 0x3fffff; | |
1039 | offset24 |= 0xff800000; /* jarl <offset24>, r31 */ | |
1040 | ||
c5aa993b JM |
1041 | store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff); |
1042 | store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16); | |
435e042a CV |
1043 | } |
1044 | ||
1045 | static CORE_ADDR | |
1046 | v850_saved_pc_after_call (struct frame_info *ignore) | |
1047 | { | |
1048 | return read_register (E_RP_REGNUM); | |
1049 | } | |
1050 | ||
1051 | static void | |
1052 | v850_extract_return_value (struct type *type, char *regbuf, char *valbuf) | |
1053 | { | |
70eb15a4 CV |
1054 | CORE_ADDR return_buffer; |
1055 | ||
1056 | if (!v850_use_struct_convention (0, type)) | |
1057 | { | |
1058 | /* Scalar return values of <= 8 bytes are returned in | |
1059 | E_V0_REGNUM to E_V1_REGNUM. */ | |
1060 | memcpy (valbuf, | |
1061 | ®buf[REGISTER_BYTE (E_V0_REGNUM)], | |
1062 | TYPE_LENGTH (type)); | |
1063 | } | |
1064 | else | |
1065 | { | |
1066 | /* Aggregates and return values > 8 bytes are returned in memory, | |
1067 | pointed to by R6. */ | |
1068 | return_buffer = | |
1069 | extract_address (regbuf + REGISTER_BYTE (E_V0_REGNUM), | |
1070 | REGISTER_RAW_SIZE (E_V0_REGNUM)); | |
1071 | ||
1072 | read_memory (return_buffer, valbuf, TYPE_LENGTH (type)); | |
1073 | } | |
435e042a CV |
1074 | } |
1075 | ||
1076 | const static unsigned char * | |
1077 | v850_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
1078 | { | |
1079 | static unsigned char breakpoint[] = { 0x85, 0x05 }; | |
1080 | *lenptr = sizeof (breakpoint); | |
1081 | return breakpoint; | |
1082 | } | |
1083 | ||
1084 | static CORE_ADDR | |
1085 | v850_extract_struct_value_address (char *regbuf) | |
1086 | { | |
1087 | return extract_address (regbuf + v850_register_byte (E_V0_REGNUM), | |
1088 | v850_register_raw_size (E_V0_REGNUM)); | |
1089 | } | |
1090 | ||
1091 | static void | |
1092 | v850_store_return_value (struct type *type, char *valbuf) | |
1093 | { | |
70eb15a4 CV |
1094 | CORE_ADDR return_buffer; |
1095 | ||
1096 | if (!v850_use_struct_convention (0, type)) | |
1097 | write_register_bytes (REGISTER_BYTE (E_V0_REGNUM), valbuf, | |
1098 | TYPE_LENGTH (type)); | |
1099 | else | |
1100 | { | |
1101 | return_buffer = read_register (E_V0_REGNUM); | |
1102 | write_memory (return_buffer, valbuf, TYPE_LENGTH (type)); | |
1103 | } | |
435e042a CV |
1104 | } |
1105 | ||
1106 | static void | |
1107 | v850_frame_init_saved_regs (struct frame_info *fi) | |
1108 | { | |
1109 | struct prologue_info pi; | |
1110 | struct pifsr pifsrs[E_NUM_REGS + 1], *pifsr; | |
1111 | CORE_ADDR func_addr, func_end; | |
1112 | ||
1113 | if (!fi->saved_regs) | |
1114 | { | |
1115 | frame_saved_regs_zalloc (fi); | |
1116 | ||
1117 | /* The call dummy doesn't save any registers on the stack, so we | |
1118 | can return now. */ | |
1119 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
1120 | return; | |
1121 | ||
1122 | /* Find the beginning of this function, so we can analyze its | |
1123 | prologue. */ | |
1124 | if (find_pc_partial_function (fi->pc, NULL, &func_addr, &func_end)) | |
1125 | { | |
1126 | pi.pifsrs = pifsrs; | |
1127 | ||
1128 | v850_scan_prologue (fi->pc, &pi); | |
1129 | ||
1130 | if (!fi->next && pi.framereg == E_SP_REGNUM) | |
1131 | fi->frame = read_register (pi.framereg) - pi.frameoffset; | |
1132 | ||
1133 | for (pifsr = pifsrs; pifsr->framereg; pifsr++) | |
1134 | { | |
1135 | fi->saved_regs[pifsr->reg] = pifsr->offset + fi->frame; | |
1136 | ||
1137 | if (pifsr->framereg == E_SP_REGNUM) | |
1138 | fi->saved_regs[pifsr->reg] += pi.frameoffset; | |
1139 | } | |
1140 | } | |
1141 | /* Else we're out of luck (can't debug completely stripped code). | |
1142 | FIXME. */ | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | /* Function: init_extra_frame_info | |
1147 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
1148 | registers. Most of the work is done in scan_prologue(). | |
1149 | ||
1150 | Note that when we are called for the last frame (currently active frame), | |
1151 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
1152 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
1153 | always be correct (since that is derived from v850_frame_chain ()). | |
1154 | ||
1155 | We can be called with the PC in the call dummy under two circumstances. | |
1156 | First, during normal backtracing, second, while figuring out the frame | |
1157 | pointer just prior to calling the target function (see run_stack_dummy). */ | |
1158 | ||
1159 | static void | |
1160 | v850_init_extra_frame_info (int fromleaf, struct frame_info *fi) | |
1161 | { | |
1162 | struct prologue_info pi; | |
1163 | ||
1164 | if (fi->next) | |
1165 | fi->pc = FRAME_SAVED_PC (fi->next); | |
1166 | ||
1167 | v850_frame_init_saved_regs (fi); | |
1168 | } | |
1169 | ||
1170 | static void | |
70eb15a4 | 1171 | v850_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
435e042a | 1172 | { |
70eb15a4 | 1173 | write_register (E_ARG0_REGNUM, addr); |
435e042a CV |
1174 | } |
1175 | ||
1176 | static CORE_ADDR | |
1177 | v850_target_read_fp (void) | |
1178 | { | |
1179 | return read_register (E_FP_RAW_REGNUM); | |
c906108c SS |
1180 | } |
1181 | ||
6ed14b0e CV |
1182 | static struct gdbarch * |
1183 | v850_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
c906108c | 1184 | { |
435e042a | 1185 | static LONGEST call_dummy_words[1] = { 0 }; |
6ed14b0e CV |
1186 | struct gdbarch_tdep *tdep = NULL; |
1187 | struct gdbarch *gdbarch; | |
1188 | int i; | |
1189 | ||
1190 | /* find a candidate among the list of pre-declared architectures. */ | |
1191 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1192 | if (arches != NULL) | |
1193 | return (arches->gdbarch); | |
c906108c | 1194 | |
6ed14b0e CV |
1195 | #if 0 |
1196 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
1197 | #endif | |
1198 | ||
435e042a | 1199 | /* Change the register names based on the current machine type. */ |
6ed14b0e | 1200 | if (info.bfd_arch_info->arch != bfd_arch_v850) |
c906108c SS |
1201 | return 0; |
1202 | ||
6ed14b0e CV |
1203 | gdbarch = gdbarch_alloc (&info, 0); |
1204 | ||
c906108c SS |
1205 | for (i = 0; v850_processor_type_table[i].regnames != NULL; i++) |
1206 | { | |
6ed14b0e | 1207 | if (v850_processor_type_table[i].mach == info.bfd_arch_info->mach) |
435e042a CV |
1208 | { |
1209 | v850_register_names = v850_processor_type_table[i].regnames; | |
1210 | tm_print_insn_info.mach = info.bfd_arch_info->mach; | |
1211 | break; | |
1212 | } | |
c906108c SS |
1213 | } |
1214 | ||
435e042a CV |
1215 | /* |
1216 | * Basic register fields and methods. | |
1217 | */ | |
1218 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
1219 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
1220 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
1221 | set_gdbarch_fp_regnum (gdbarch, E_FP_REGNUM); | |
1222 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); | |
1223 | set_gdbarch_register_name (gdbarch, v850_register_name); | |
1224 | set_gdbarch_register_size (gdbarch, v850_reg_size); | |
1225 | set_gdbarch_register_bytes (gdbarch, E_ALL_REGS_SIZE); | |
1226 | set_gdbarch_register_byte (gdbarch, v850_register_byte); | |
1227 | set_gdbarch_register_raw_size (gdbarch, v850_register_raw_size); | |
1228 | set_gdbarch_max_register_raw_size (gdbarch, v850_reg_size); | |
1229 | set_gdbarch_register_virtual_size (gdbarch, v850_register_raw_size); | |
1230 | set_gdbarch_max_register_virtual_size (gdbarch, v850_reg_size); | |
1231 | set_gdbarch_register_virtual_type (gdbarch, v850_reg_virtual_type); | |
1232 | ||
1233 | set_gdbarch_read_fp (gdbarch, v850_target_read_fp); | |
1234 | ||
1235 | /* | |
1236 | * Frame Info | |
1237 | */ | |
1238 | set_gdbarch_init_extra_frame_info (gdbarch, v850_init_extra_frame_info); | |
1239 | set_gdbarch_frame_init_saved_regs (gdbarch, v850_frame_init_saved_regs); | |
1240 | set_gdbarch_frame_chain (gdbarch, v850_frame_chain); | |
1241 | set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register); | |
1242 | set_gdbarch_saved_pc_after_call (gdbarch, v850_saved_pc_after_call); | |
1243 | set_gdbarch_frame_saved_pc (gdbarch, v850_frame_saved_pc); | |
1244 | set_gdbarch_skip_prologue (gdbarch, v850_skip_prologue); | |
1245 | set_gdbarch_frame_chain_valid (gdbarch, generic_file_frame_chain_valid); | |
1246 | set_gdbarch_frame_args_address (gdbarch, default_frame_address); | |
1247 | set_gdbarch_frame_locals_address (gdbarch, default_frame_address); | |
1248 | ||
1249 | /* | |
1250 | * Miscelany | |
1251 | */ | |
1252 | /* Stack grows up. */ | |
1253 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
1254 | /* PC stops zero byte after a trap instruction | |
1255 | (which means: exactly on trap instruction). */ | |
1256 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
1257 | /* This value is almost never non-zero... */ | |
1258 | set_gdbarch_function_start_offset (gdbarch, 0); | |
1259 | /* This value is almost never non-zero... */ | |
1260 | set_gdbarch_frame_args_skip (gdbarch, 0); | |
1261 | /* OK to default this value to 'unknown'. */ | |
1262 | set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown); | |
1263 | /* W/o prototype, coerce float args to double. */ | |
1264 | set_gdbarch_coerce_float_to_double (gdbarch, standard_coerce_float_to_double); | |
1265 | ||
1266 | /* | |
1267 | * Call Dummies | |
1268 | * | |
1269 | * These values and methods are used when gdb calls a target function. */ | |
1270 | set_gdbarch_use_generic_dummy_frames (gdbarch, 1); | |
1271 | set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame); | |
1272 | set_gdbarch_push_return_address (gdbarch, v850_push_return_address); | |
26e9b323 | 1273 | set_gdbarch_deprecated_extract_return_value (gdbarch, v850_extract_return_value); |
435e042a CV |
1274 | set_gdbarch_push_arguments (gdbarch, v850_push_arguments); |
1275 | set_gdbarch_pop_frame (gdbarch, v850_pop_frame); | |
1276 | set_gdbarch_store_struct_return (gdbarch, v850_store_struct_return); | |
1277 | set_gdbarch_store_return_value (gdbarch, v850_store_return_value); | |
26e9b323 | 1278 | set_gdbarch_deprecated_extract_struct_value_address (gdbarch, v850_extract_struct_value_address); |
435e042a CV |
1279 | set_gdbarch_use_struct_convention (gdbarch, v850_use_struct_convention); |
1280 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); | |
1281 | set_gdbarch_call_dummy_address (gdbarch, entry_point_address); | |
1282 | set_gdbarch_call_dummy_start_offset (gdbarch, 0); | |
1283 | set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0); | |
1284 | set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); | |
1285 | set_gdbarch_call_dummy_length (gdbarch, 0); | |
1286 | set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy); | |
1287 | set_gdbarch_call_dummy_p (gdbarch, 1); | |
1288 | set_gdbarch_call_dummy_words (gdbarch, call_dummy_nil); | |
1289 | set_gdbarch_sizeof_call_dummy_words (gdbarch, 0); | |
1290 | set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); | |
1291 | /* set_gdbarch_call_dummy_stack_adjust */ | |
1292 | set_gdbarch_fix_call_dummy (gdbarch, v850_fix_call_dummy); | |
1293 | set_gdbarch_breakpoint_from_pc (gdbarch, v850_breakpoint_from_pc); | |
1294 | ||
1295 | set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1296 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1297 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1298 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
1299 | ||
1300 | set_gdbarch_extra_stack_alignment_needed (gdbarch, 0); | |
1301 | ||
6ed14b0e | 1302 | return gdbarch; |
c906108c SS |
1303 | } |
1304 | ||
1305 | void | |
fba45db2 | 1306 | _initialize_v850_tdep (void) |
c906108c SS |
1307 | { |
1308 | tm_print_insn = print_insn_v850; | |
6ed14b0e | 1309 | register_gdbarch_init (bfd_arch_v850, v850_gdbarch_init); |
c906108c | 1310 | } |