Commit | Line | Data |
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c906108c | 1 | /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. |
464e0365 AC |
2 | |
3 | Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free | |
4 | Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
c906108c SS |
26 | #include "target.h" |
27 | #include "value.h" | |
28 | #include "bfd.h" | |
29 | #include "gdb_string.h" | |
30 | #include "gdbcore.h" | |
31 | #include "symfile.h" | |
b4a20239 | 32 | #include "arch-utils.h" |
4e052eda | 33 | #include "regcache.h" |
435e042a | 34 | #include "symtab.h" |
a89aa300 | 35 | #include "dis-asm.h" |
c906108c | 36 | |
435e042a CV |
37 | struct gdbarch_tdep |
38 | { | |
39 | /* gdbarch target dependent data here. Currently unused for v850. */ | |
40 | }; | |
41 | ||
42 | /* Extra info which is saved in each frame_info. */ | |
43 | struct frame_extra_info | |
44 | { | |
45 | }; | |
c906108c | 46 | |
435e042a CV |
47 | enum { |
48 | E_R0_REGNUM, | |
49 | E_R1_REGNUM, | |
50 | E_R2_REGNUM, E_SAVE1_START_REGNUM = E_R2_REGNUM, E_SAVE1_END_REGNUM = E_R2_REGNUM, | |
51 | E_R3_REGNUM, E_SP_REGNUM = E_R3_REGNUM, | |
52 | E_R4_REGNUM, | |
53 | E_R5_REGNUM, | |
54 | E_R6_REGNUM, E_ARG0_REGNUM = E_R6_REGNUM, | |
55 | E_R7_REGNUM, | |
56 | E_R8_REGNUM, | |
57 | E_R9_REGNUM, E_ARGLAST_REGNUM = E_R9_REGNUM, | |
58 | E_R10_REGNUM, E_V0_REGNUM = E_R10_REGNUM, | |
59 | E_R11_REGNUM, E_V1_REGNUM = E_R11_REGNUM, | |
60 | E_R12_REGNUM, | |
61 | E_R13_REGNUM, | |
62 | E_R14_REGNUM, | |
63 | E_R15_REGNUM, | |
64 | E_R16_REGNUM, | |
65 | E_R17_REGNUM, | |
66 | E_R18_REGNUM, | |
67 | E_R19_REGNUM, | |
68 | E_R20_REGNUM, E_SAVE2_START_REGNUM = E_R20_REGNUM, | |
69 | E_R21_REGNUM, | |
70 | E_R22_REGNUM, | |
71 | E_R23_REGNUM, | |
72 | E_R24_REGNUM, | |
73 | E_R25_REGNUM, | |
74 | E_R26_REGNUM, | |
75 | E_R27_REGNUM, | |
76 | E_R28_REGNUM, | |
77 | E_R29_REGNUM, E_SAVE2_END_REGNUM = E_R29_REGNUM, E_FP_RAW_REGNUM = E_R29_REGNUM, | |
78 | E_R30_REGNUM, E_EP_REGNUM = E_R30_REGNUM, | |
79 | E_R31_REGNUM, E_SAVE3_START_REGNUM = E_R31_REGNUM, E_SAVE3_END_REGNUM = E_R31_REGNUM, E_RP_REGNUM = E_R31_REGNUM, | |
80 | E_R32_REGNUM, E_SR0_REGNUM = E_R32_REGNUM, | |
81 | E_R33_REGNUM, | |
82 | E_R34_REGNUM, | |
83 | E_R35_REGNUM, | |
84 | E_R36_REGNUM, | |
85 | E_R37_REGNUM, E_PS_REGNUM = E_R37_REGNUM, | |
86 | E_R38_REGNUM, | |
87 | E_R39_REGNUM, | |
88 | E_R40_REGNUM, | |
89 | E_R41_REGNUM, | |
90 | E_R42_REGNUM, | |
91 | E_R43_REGNUM, | |
92 | E_R44_REGNUM, | |
93 | E_R45_REGNUM, | |
94 | E_R46_REGNUM, | |
95 | E_R47_REGNUM, | |
96 | E_R48_REGNUM, | |
97 | E_R49_REGNUM, | |
98 | E_R50_REGNUM, | |
99 | E_R51_REGNUM, | |
100 | E_R52_REGNUM, E_CTBP_REGNUM = E_R52_REGNUM, | |
101 | E_R53_REGNUM, | |
102 | E_R54_REGNUM, | |
103 | E_R55_REGNUM, | |
104 | E_R56_REGNUM, | |
105 | E_R57_REGNUM, | |
106 | E_R58_REGNUM, | |
107 | E_R59_REGNUM, | |
108 | E_R60_REGNUM, | |
109 | E_R61_REGNUM, | |
110 | E_R62_REGNUM, | |
111 | E_R63_REGNUM, | |
112 | E_R64_REGNUM, E_PC_REGNUM = E_R64_REGNUM, | |
113 | E_R65_REGNUM, E_FP_REGNUM = E_R65_REGNUM, | |
114 | E_NUM_REGS | |
115 | }; | |
116 | ||
117 | enum | |
118 | { | |
119 | v850_reg_size = 4 | |
120 | }; | |
121 | ||
122 | /* Size of all registers as a whole. */ | |
123 | enum | |
124 | { | |
125 | E_ALL_REGS_SIZE = (E_NUM_REGS) * v850_reg_size | |
126 | }; | |
127 | ||
70eb15a4 CV |
128 | /* Size of return datatype which fits into all return registers. */ |
129 | enum | |
130 | { | |
131 | E_MAX_RETTYPE_SIZE_IN_REGS = 2 * v850_reg_size | |
132 | }; | |
133 | ||
435e042a CV |
134 | static LONGEST call_dummy_nil[] = {0}; |
135 | ||
136 | static char *v850_generic_reg_names[] = | |
137 | { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
138 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
139 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
140 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
141 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
142 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
143 | "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23", | |
144 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
145 | "pc", "fp" | |
146 | }; | |
c906108c SS |
147 | |
148 | static char *v850e_reg_names[] = | |
149 | { | |
150 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
151 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
152 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
153 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
154 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
155 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
156 | "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23", | |
157 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
158 | "pc", "fp" | |
159 | }; | |
160 | ||
161 | char **v850_register_names = v850_generic_reg_names; | |
162 | ||
163 | struct | |
c5aa993b JM |
164 | { |
165 | char **regnames; | |
166 | int mach; | |
167 | } | |
168 | v850_processor_type_table[] = | |
c906108c | 169 | { |
c5aa993b JM |
170 | { |
171 | v850_generic_reg_names, bfd_mach_v850 | |
172 | } | |
173 | , | |
174 | { | |
175 | v850e_reg_names, bfd_mach_v850e | |
176 | } | |
177 | , | |
83ee270e NC |
178 | { |
179 | v850e_reg_names, bfd_mach_v850e1 | |
180 | } | |
181 | , | |
c5aa993b JM |
182 | { |
183 | NULL, 0 | |
184 | } | |
c906108c SS |
185 | }; |
186 | ||
187 | /* Info gleaned from scanning a function's prologue. */ | |
188 | ||
189 | struct pifsr /* Info about one saved reg */ | |
c5aa993b JM |
190 | { |
191 | int framereg; /* Frame reg (SP or FP) */ | |
192 | int offset; /* Offset from framereg */ | |
193 | int cur_frameoffset; /* Current frameoffset */ | |
194 | int reg; /* Saved register number */ | |
195 | }; | |
c906108c SS |
196 | |
197 | struct prologue_info | |
c5aa993b JM |
198 | { |
199 | int framereg; | |
200 | int frameoffset; | |
201 | int start_function; | |
202 | struct pifsr *pifsrs; | |
203 | }; | |
c906108c | 204 | |
a14ed312 | 205 | static CORE_ADDR v850_scan_prologue (CORE_ADDR pc, struct prologue_info *fs); |
c906108c | 206 | |
435e042a CV |
207 | /* Function: v850_register_name |
208 | Returns the name of the v850/v850e register N. */ | |
209 | ||
fa88f677 | 210 | static const char * |
435e042a CV |
211 | v850_register_name (int regnum) |
212 | { | |
213 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
214 | internal_error (__FILE__, __LINE__, | |
215 | "v850_register_name: illegal register number %d", | |
216 | regnum); | |
217 | else | |
218 | return v850_register_names[regnum]; | |
219 | ||
220 | } | |
221 | ||
222 | /* Function: v850_register_byte | |
223 | Returns the byte position in the register cache for register N. */ | |
224 | ||
225 | static int | |
226 | v850_register_byte (int regnum) | |
227 | { | |
228 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
229 | internal_error (__FILE__, __LINE__, | |
230 | "v850_register_byte: illegal register number %d", | |
231 | regnum); | |
232 | else | |
233 | return regnum * v850_reg_size; | |
234 | } | |
235 | ||
236 | /* Function: v850_register_raw_size | |
237 | Returns the number of bytes occupied by the register on the target. */ | |
238 | ||
239 | static int | |
240 | v850_register_raw_size (int regnum) | |
241 | { | |
242 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
243 | internal_error (__FILE__, __LINE__, | |
244 | "v850_register_raw_size: illegal register number %d", | |
245 | regnum); | |
246 | /* Only the PC has 4 Byte, all other registers 2 Byte. */ | |
247 | else | |
248 | return v850_reg_size; | |
249 | } | |
250 | ||
435e042a CV |
251 | /* Function: v850_reg_virtual_type |
252 | Returns the default type for register N. */ | |
253 | ||
254 | static struct type * | |
255 | v850_reg_virtual_type (int regnum) | |
256 | { | |
257 | if (regnum < 0 || regnum >= E_NUM_REGS) | |
258 | internal_error (__FILE__, __LINE__, | |
259 | "v850_register_virtual_type: illegal register number %d", | |
260 | regnum); | |
261 | else if (regnum == E_PC_REGNUM) | |
262 | return builtin_type_uint32; | |
263 | else | |
264 | return builtin_type_int32; | |
265 | } | |
c906108c | 266 | |
70eb15a4 CV |
267 | static int |
268 | v850_type_is_scalar (struct type *t) | |
269 | { | |
270 | return (TYPE_CODE (t) != TYPE_CODE_STRUCT | |
271 | && TYPE_CODE (t) != TYPE_CODE_UNION | |
272 | && TYPE_CODE (t) != TYPE_CODE_ARRAY); | |
273 | } | |
274 | ||
c906108c | 275 | /* Should call_function allocate stack space for a struct return? */ |
70eb15a4 | 276 | static int |
fba45db2 | 277 | v850_use_struct_convention (int gcc_p, struct type *type) |
c906108c | 278 | { |
70eb15a4 CV |
279 | /* According to ABI: |
280 | * return TYPE_LENGTH (type) > 8); | |
281 | */ | |
282 | ||
283 | /* Current implementation in gcc: */ | |
284 | ||
285 | int i; | |
286 | struct type *fld_type, *tgt_type; | |
287 | ||
288 | /* 1. The value is greater than 8 bytes -> returned by copying */ | |
289 | if (TYPE_LENGTH (type) > 8) | |
290 | return 1; | |
291 | ||
292 | /* 2. The value is a single basic type -> returned in register */ | |
293 | if (v850_type_is_scalar (type)) | |
294 | return 0; | |
295 | ||
296 | /* The value is a structure or union with a single element | |
297 | * and that element is either a single basic type or an array of | |
298 | * a single basic type whoes size is greater than or equal to 4 | |
299 | * -> returned in register */ | |
300 | if ((TYPE_CODE (type) == TYPE_CODE_STRUCT | |
301 | || TYPE_CODE (type) == TYPE_CODE_UNION) | |
302 | && TYPE_NFIELDS (type) == 1) | |
303 | { | |
304 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
305 | if (v850_type_is_scalar (fld_type) && TYPE_LENGTH (fld_type) >= 4) | |
306 | return 0; | |
307 | ||
308 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) | |
309 | { | |
310 | tgt_type = TYPE_TARGET_TYPE (fld_type); | |
311 | if (v850_type_is_scalar (tgt_type) && TYPE_LENGTH (tgt_type) >= 4) | |
312 | return 0; | |
313 | } | |
314 | } | |
315 | ||
316 | /* The value is a structure whose first element is an integer or | |
317 | * a float, and which contains no arrays of more than two elements | |
318 | * -> returned in register */ | |
319 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT | |
320 | && v850_type_is_scalar (TYPE_FIELD_TYPE (type, 0)) | |
321 | && TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0)) == 4) | |
322 | { | |
323 | for (i = 1; i < TYPE_NFIELDS (type); ++i) | |
324 | { | |
325 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
326 | if (TYPE_CODE (fld_type) == TYPE_CODE_ARRAY) | |
327 | { | |
328 | tgt_type = TYPE_TARGET_TYPE (fld_type); | |
329 | if (TYPE_LENGTH (fld_type) >= 0 && TYPE_LENGTH (tgt_type) >= 0 | |
330 | && TYPE_LENGTH (fld_type) / TYPE_LENGTH (tgt_type) > 2) | |
331 | return 1; | |
332 | } | |
333 | } | |
334 | return 0; | |
335 | } | |
336 | ||
337 | /* The value is a union which contains at least one field which | |
338 | * would be returned in registers according to these rules | |
339 | * -> returned in register */ | |
340 | if (TYPE_CODE (type) == TYPE_CODE_UNION) | |
341 | { | |
342 | for (i = 0; i < TYPE_NFIELDS (type); ++i) | |
343 | { | |
344 | fld_type = TYPE_FIELD_TYPE (type, 0); | |
345 | if (!v850_use_struct_convention (0, fld_type)) | |
346 | return 0; | |
347 | } | |
348 | } | |
349 | ||
350 | return 1; | |
c906108c | 351 | } |
c906108c SS |
352 | \f |
353 | ||
c5aa993b | 354 | |
c906108c | 355 | /* Structure for mapping bits in register lists to register numbers. */ |
c5aa993b | 356 | struct reg_list |
c906108c SS |
357 | { |
358 | long mask; | |
359 | int regno; | |
360 | }; | |
361 | ||
362 | /* Helper function for v850_scan_prologue to handle prepare instruction. */ | |
363 | ||
364 | static void | |
c5aa993b | 365 | handle_prepare (int insn, int insn2, CORE_ADDR * current_pc_ptr, |
c906108c | 366 | struct prologue_info *pi, struct pifsr **pifsr_ptr) |
c906108c SS |
367 | { |
368 | CORE_ADDR current_pc = *current_pc_ptr; | |
369 | struct pifsr *pifsr = *pifsr_ptr; | |
370 | long next = insn2 & 0xffff; | |
371 | long list12 = ((insn & 1) << 16) + (next & 0xffe0); | |
372 | long offset = (insn & 0x3e) << 1; | |
c5aa993b | 373 | static struct reg_list reg_table[] = |
c906108c | 374 | { |
c5aa993b JM |
375 | {0x00800, 20}, /* r20 */ |
376 | {0x00400, 21}, /* r21 */ | |
377 | {0x00200, 22}, /* r22 */ | |
378 | {0x00100, 23}, /* r23 */ | |
379 | {0x08000, 24}, /* r24 */ | |
380 | {0x04000, 25}, /* r25 */ | |
381 | {0x02000, 26}, /* r26 */ | |
382 | {0x01000, 27}, /* r27 */ | |
383 | {0x00080, 28}, /* r28 */ | |
384 | {0x00040, 29}, /* r29 */ | |
385 | {0x10000, 30}, /* ep */ | |
386 | {0x00020, 31}, /* lp */ | |
387 | {0, 0} /* end of table */ | |
c906108c SS |
388 | }; |
389 | int i; | |
390 | ||
c5aa993b | 391 | if ((next & 0x1f) == 0x0b) /* skip imm16 argument */ |
c906108c SS |
392 | current_pc += 2; |
393 | else if ((next & 0x1f) == 0x13) /* skip imm16 argument */ | |
394 | current_pc += 2; | |
395 | else if ((next & 0x1f) == 0x1b) /* skip imm32 argument */ | |
396 | current_pc += 4; | |
397 | ||
398 | /* Calculate the total size of the saved registers, and add it | |
399 | it to the immediate value used to adjust SP. */ | |
400 | for (i = 0; reg_table[i].mask != 0; i++) | |
401 | if (list12 & reg_table[i].mask) | |
435e042a | 402 | offset += v850_register_raw_size (reg_table[i].regno); |
c906108c SS |
403 | pi->frameoffset -= offset; |
404 | ||
405 | /* Calculate the offsets of the registers relative to the value | |
406 | the SP will have after the registers have been pushed and the | |
407 | imm5 value has been subtracted from it. */ | |
408 | if (pifsr) | |
409 | { | |
410 | for (i = 0; reg_table[i].mask != 0; i++) | |
411 | { | |
412 | if (list12 & reg_table[i].mask) | |
413 | { | |
414 | int reg = reg_table[i].regno; | |
435e042a | 415 | offset -= v850_register_raw_size (reg); |
c906108c SS |
416 | pifsr->reg = reg; |
417 | pifsr->offset = offset; | |
418 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 419 | #ifdef DEBUG |
c906108c | 420 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 421 | #endif |
c906108c SS |
422 | pifsr++; |
423 | } | |
424 | } | |
425 | } | |
426 | #ifdef DEBUG | |
427 | printf_filtered ("\tfound ctret after regsave func"); | |
428 | #endif | |
429 | ||
430 | /* Set result parameters. */ | |
431 | *current_pc_ptr = current_pc; | |
432 | *pifsr_ptr = pifsr; | |
433 | } | |
434 | ||
435 | ||
436 | /* Helper function for v850_scan_prologue to handle pushm/pushl instructions. | |
437 | FIXME: the SR bit of the register list is not supported; must check | |
438 | that the compiler does not ever generate this bit. */ | |
439 | ||
440 | static void | |
441 | handle_pushm (int insn, int insn2, struct prologue_info *pi, | |
c5aa993b | 442 | struct pifsr **pifsr_ptr) |
c906108c SS |
443 | { |
444 | struct pifsr *pifsr = *pifsr_ptr; | |
445 | long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0); | |
446 | long offset = 0; | |
c5aa993b | 447 | static struct reg_list pushml_reg_table[] = |
c906108c | 448 | { |
435e042a | 449 | {0x80000, E_PS_REGNUM}, /* PSW */ |
c5aa993b JM |
450 | {0x40000, 1}, /* r1 */ |
451 | {0x20000, 2}, /* r2 */ | |
452 | {0x10000, 3}, /* r3 */ | |
453 | {0x00800, 4}, /* r4 */ | |
454 | {0x00400, 5}, /* r5 */ | |
455 | {0x00200, 6}, /* r6 */ | |
456 | {0x00100, 7}, /* r7 */ | |
457 | {0x08000, 8}, /* r8 */ | |
458 | {0x04000, 9}, /* r9 */ | |
459 | {0x02000, 10}, /* r10 */ | |
460 | {0x01000, 11}, /* r11 */ | |
461 | {0x00080, 12}, /* r12 */ | |
462 | {0x00040, 13}, /* r13 */ | |
463 | {0x00020, 14}, /* r14 */ | |
464 | {0x00010, 15}, /* r15 */ | |
465 | {0, 0} /* end of table */ | |
c906108c | 466 | }; |
c5aa993b | 467 | static struct reg_list pushmh_reg_table[] = |
c906108c | 468 | { |
c5aa993b JM |
469 | {0x80000, 16}, /* r16 */ |
470 | {0x40000, 17}, /* r17 */ | |
471 | {0x20000, 18}, /* r18 */ | |
472 | {0x10000, 19}, /* r19 */ | |
473 | {0x00800, 20}, /* r20 */ | |
474 | {0x00400, 21}, /* r21 */ | |
475 | {0x00200, 22}, /* r22 */ | |
476 | {0x00100, 23}, /* r23 */ | |
477 | {0x08000, 24}, /* r24 */ | |
478 | {0x04000, 25}, /* r25 */ | |
479 | {0x02000, 26}, /* r26 */ | |
480 | {0x01000, 27}, /* r27 */ | |
481 | {0x00080, 28}, /* r28 */ | |
482 | {0x00040, 29}, /* r29 */ | |
483 | {0x00010, 30}, /* r30 */ | |
484 | {0x00020, 31}, /* r31 */ | |
485 | {0, 0} /* end of table */ | |
c906108c SS |
486 | }; |
487 | struct reg_list *reg_table; | |
488 | int i; | |
489 | ||
490 | /* Is this a pushml or a pushmh? */ | |
491 | if ((insn2 & 7) == 1) | |
492 | reg_table = pushml_reg_table; | |
493 | else | |
494 | reg_table = pushmh_reg_table; | |
495 | ||
496 | /* Calculate the total size of the saved registers, and add it | |
497 | it to the immediate value used to adjust SP. */ | |
498 | for (i = 0; reg_table[i].mask != 0; i++) | |
499 | if (list12 & reg_table[i].mask) | |
435e042a | 500 | offset += v850_register_raw_size (reg_table[i].regno); |
c906108c SS |
501 | pi->frameoffset -= offset; |
502 | ||
503 | /* Calculate the offsets of the registers relative to the value | |
504 | the SP will have after the registers have been pushed and the | |
505 | imm5 value is subtracted from it. */ | |
506 | if (pifsr) | |
507 | { | |
508 | for (i = 0; reg_table[i].mask != 0; i++) | |
509 | { | |
510 | if (list12 & reg_table[i].mask) | |
511 | { | |
512 | int reg = reg_table[i].regno; | |
435e042a | 513 | offset -= v850_register_raw_size (reg); |
c906108c SS |
514 | pifsr->reg = reg; |
515 | pifsr->offset = offset; | |
516 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 517 | #ifdef DEBUG |
c906108c | 518 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 519 | #endif |
c906108c SS |
520 | pifsr++; |
521 | } | |
522 | } | |
523 | } | |
524 | #ifdef DEBUG | |
525 | printf_filtered ("\tfound ctret after regsave func"); | |
526 | #endif | |
527 | ||
528 | /* Set result parameters. */ | |
529 | *pifsr_ptr = pifsr; | |
530 | } | |
c5aa993b | 531 | \f |
c906108c SS |
532 | |
533 | ||
534 | ||
c906108c SS |
535 | /* Function: scan_prologue |
536 | Scan the prologue of the function that contains PC, and record what | |
3a06899a CV |
537 | we find in PI. Returns the pc after the prologue. Note that the |
538 | addresses saved in frame->saved_regs are just frame relative (negative | |
539 | offsets from the frame pointer). This is because we don't know the | |
540 | actual value of the frame pointer yet. In some circumstances, the | |
541 | frame pointer can't be determined till after we have scanned the | |
542 | prologue. */ | |
c906108c SS |
543 | |
544 | static CORE_ADDR | |
fba45db2 | 545 | v850_scan_prologue (CORE_ADDR pc, struct prologue_info *pi) |
c906108c SS |
546 | { |
547 | CORE_ADDR func_addr, prologue_end, current_pc; | |
548 | struct pifsr *pifsr, *pifsr_tmp; | |
549 | int fp_used; | |
550 | int ep_used; | |
551 | int reg; | |
552 | CORE_ADDR save_pc, save_end; | |
553 | int regsave_func_p; | |
554 | int r12_tmp; | |
555 | ||
556 | /* First, figure out the bounds of the prologue so that we can limit the | |
557 | search to something reasonable. */ | |
558 | ||
559 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
560 | { | |
561 | struct symtab_and_line sal; | |
562 | ||
563 | sal = find_pc_line (func_addr, 0); | |
564 | ||
565 | if (func_addr == entry_point_address ()) | |
566 | pi->start_function = 1; | |
567 | else | |
568 | pi->start_function = 0; | |
569 | ||
570 | #if 0 | |
571 | if (sal.line == 0) | |
572 | prologue_end = pc; | |
573 | else | |
574 | prologue_end = sal.end; | |
575 | #else | |
576 | prologue_end = pc; | |
577 | #endif | |
578 | } | |
579 | else | |
580 | { /* We're in the boondocks */ | |
581 | func_addr = pc - 100; | |
582 | prologue_end = pc; | |
583 | } | |
584 | ||
585 | prologue_end = min (prologue_end, pc); | |
586 | ||
587 | /* Now, search the prologue looking for instructions that setup fp, save | |
588 | rp, adjust sp and such. We also record the frame offset of any saved | |
c5aa993b | 589 | registers. */ |
c906108c SS |
590 | |
591 | pi->frameoffset = 0; | |
435e042a | 592 | pi->framereg = E_SP_REGNUM; |
c906108c SS |
593 | fp_used = 0; |
594 | ep_used = 0; | |
595 | pifsr = pi->pifsrs; | |
596 | regsave_func_p = 0; | |
597 | save_pc = 0; | |
598 | save_end = 0; | |
599 | r12_tmp = 0; | |
600 | ||
601 | #ifdef DEBUG | |
602 | printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n", | |
c5aa993b | 603 | (long) func_addr, (long) prologue_end); |
c906108c SS |
604 | #endif |
605 | ||
c5aa993b | 606 | for (current_pc = func_addr; current_pc < prologue_end;) |
c906108c | 607 | { |
93d56215 AC |
608 | int insn; |
609 | int insn2 = -1; /* dummy value */ | |
c906108c SS |
610 | |
611 | #ifdef DEBUG | |
92bf2b80 AC |
612 | fprintf_filtered (gdb_stdlog, "0x%.8lx ", (long) current_pc); |
613 | gdb_print_insn (current_pc, gdb_stdlog); | |
c906108c SS |
614 | #endif |
615 | ||
616 | insn = read_memory_unsigned_integer (current_pc, 2); | |
617 | current_pc += 2; | |
c5aa993b | 618 | if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ |
c906108c SS |
619 | { |
620 | insn2 = read_memory_unsigned_integer (current_pc, 2); | |
621 | current_pc += 2; | |
622 | } | |
623 | ||
624 | if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) | |
625 | { /* jarl <func>,10 */ | |
c5aa993b | 626 | long low_disp = insn2 & ~(long) 1; |
c906108c | 627 | long disp = (((((insn & 0x3f) << 16) + low_disp) |
c5aa993b | 628 | & ~(long) 1) ^ 0x00200000) - 0x00200000; |
c906108c SS |
629 | |
630 | save_pc = current_pc; | |
631 | save_end = prologue_end; | |
632 | regsave_func_p = 1; | |
633 | current_pc += disp - 4; | |
634 | prologue_end = (current_pc | |
635 | + (2 * 3) /* moves to/from ep */ | |
c5aa993b JM |
636 | + 4 /* addi <const>,sp,sp */ |
637 | + 2 /* jmp [r10] */ | |
c906108c SS |
638 | + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ |
639 | + 20); /* slop area */ | |
640 | ||
641 | #ifdef DEBUG | |
642 | printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n", | |
c5aa993b | 643 | disp, low_disp, (long) current_pc + 2); |
c906108c SS |
644 | #endif |
645 | continue; | |
646 | } | |
647 | else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p) | |
648 | { /* callt <imm6> */ | |
435e042a | 649 | long ctbp = read_register (E_CTBP_REGNUM); |
c906108c SS |
650 | long adr = ctbp + ((insn & 0x3f) << 1); |
651 | ||
652 | save_pc = current_pc; | |
653 | save_end = prologue_end; | |
654 | regsave_func_p = 1; | |
655 | current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff); | |
656 | prologue_end = (current_pc | |
657 | + (2 * 3) /* prepare list2,imm5,sp/imm */ | |
c5aa993b | 658 | + 4 /* ctret */ |
c906108c SS |
659 | + 20); /* slop area */ |
660 | ||
661 | #ifdef DEBUG | |
662 | printf_filtered ("\tfound callt, ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n", | |
c5aa993b | 663 | ctbp, adr, (long) current_pc); |
c906108c SS |
664 | #endif |
665 | continue; | |
666 | } | |
667 | else if ((insn & 0xffc0) == 0x0780) /* prepare list2,imm5 */ | |
668 | { | |
669 | handle_prepare (insn, insn2, ¤t_pc, pi, &pifsr); | |
670 | continue; | |
671 | } | |
672 | else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144) | |
673 | { /* ctret after processing register save function */ | |
674 | current_pc = save_pc; | |
675 | prologue_end = save_end; | |
676 | regsave_func_p = 0; | |
677 | #ifdef DEBUG | |
678 | printf_filtered ("\tfound ctret after regsave func"); | |
679 | #endif | |
680 | continue; | |
681 | } | |
682 | else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1) | |
683 | { /* pushml, pushmh */ | |
684 | handle_pushm (insn, insn2, pi, &pifsr); | |
685 | continue; | |
686 | } | |
687 | else if ((insn & 0xffe0) == 0x0060 && regsave_func_p) | |
688 | { /* jmp after processing register save function */ | |
689 | current_pc = save_pc; | |
690 | prologue_end = save_end; | |
691 | regsave_func_p = 0; | |
692 | #ifdef DEBUG | |
693 | printf_filtered ("\tfound jmp after regsave func"); | |
694 | #endif | |
695 | continue; | |
696 | } | |
697 | else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */ | |
698 | || (insn & 0xffe0) == 0x0060 /* jmp */ | |
699 | || (insn & 0x0780) == 0x0580) /* branch */ | |
700 | { | |
701 | #ifdef DEBUG | |
702 | printf_filtered ("\n"); | |
703 | #endif | |
c5aa993b | 704 | break; /* Ran into end of prologue */ |
c906108c SS |
705 | } |
706 | ||
435e042a | 707 | else if ((insn & 0xffe0) == ((E_SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */ |
c906108c | 708 | pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; |
435e042a | 709 | else if (insn == ((E_SP_REGNUM << 11) | 0x0600 | E_SP_REGNUM)) /* addi <imm>,sp,sp */ |
c906108c | 710 | pi->frameoffset += insn2; |
435e042a | 711 | else if (insn == ((E_FP_RAW_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,fp */ |
c906108c SS |
712 | { |
713 | fp_used = 1; | |
435e042a | 714 | pi->framereg = E_FP_RAW_REGNUM; |
c906108c SS |
715 | } |
716 | ||
435e042a | 717 | else if (insn == ((E_R12_REGNUM << 11) | 0x0640 | E_R0_REGNUM)) /* movhi hi(const),r0,r12 */ |
c906108c | 718 | r12_tmp = insn2 << 16; |
435e042a | 719 | else if (insn == ((E_R12_REGNUM << 11) | 0x0620 | E_R12_REGNUM)) /* movea lo(const),r12,r12 */ |
c906108c | 720 | r12_tmp += insn2; |
435e042a | 721 | else if (insn == ((E_SP_REGNUM << 11) | 0x01c0 | E_R12_REGNUM) && r12_tmp) /* add r12,sp */ |
c906108c | 722 | pi->frameoffset = r12_tmp; |
435e042a | 723 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_SP_REGNUM)) /* mov sp,ep */ |
c906108c | 724 | ep_used = 1; |
435e042a | 725 | else if (insn == ((E_EP_REGNUM << 11) | 0x0000 | E_R1_REGNUM)) /* mov r1,ep */ |
c906108c | 726 | ep_used = 0; |
435e042a | 727 | else if (((insn & 0x07ff) == (0x0760 | E_SP_REGNUM) /* st.w <reg>,<offset>[sp] */ |
c906108c | 728 | || (fp_used |
435e042a | 729 | && (insn & 0x07ff) == (0x0760 | E_FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */ |
c906108c | 730 | && pifsr |
435e042a CV |
731 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
732 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) | |
733 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) | |
c906108c SS |
734 | { |
735 | pifsr->reg = reg; | |
736 | pifsr->offset = insn2 & ~1; | |
737 | pifsr->cur_frameoffset = pi->frameoffset; | |
738 | #ifdef DEBUG | |
739 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
740 | #endif | |
741 | pifsr++; | |
742 | } | |
743 | ||
c5aa993b | 744 | else if (ep_used /* sst.w <reg>,<offset>[ep] */ |
c906108c SS |
745 | && ((insn & 0x0781) == 0x0501) |
746 | && pifsr | |
435e042a CV |
747 | && (((reg = (insn >> 11) & 0x1f) >= E_SAVE1_START_REGNUM && reg <= E_SAVE1_END_REGNUM) |
748 | || (reg >= E_SAVE2_START_REGNUM && reg <= E_SAVE2_END_REGNUM) | |
749 | || (reg >= E_SAVE3_START_REGNUM && reg <= E_SAVE3_END_REGNUM))) | |
c906108c SS |
750 | { |
751 | pifsr->reg = reg; | |
752 | pifsr->offset = (insn & 0x007e) << 1; | |
753 | pifsr->cur_frameoffset = pi->frameoffset; | |
754 | #ifdef DEBUG | |
755 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
756 | #endif | |
757 | pifsr++; | |
758 | } | |
759 | ||
760 | #ifdef DEBUG | |
761 | printf_filtered ("\n"); | |
762 | #endif | |
763 | } | |
764 | ||
765 | if (pifsr) | |
766 | pifsr->framereg = 0; /* Tie off last entry */ | |
767 | ||
768 | /* Fix up any offsets to the final offset. If a frame pointer was created, use it | |
769 | instead of the stack pointer. */ | |
770 | for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++) | |
771 | { | |
772 | pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset; | |
773 | pifsr_tmp->framereg = pi->framereg; | |
774 | ||
775 | #ifdef DEBUG | |
776 | printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n", | |
c5aa993b | 777 | pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg); |
c906108c SS |
778 | #endif |
779 | } | |
780 | ||
781 | #ifdef DEBUG | |
782 | printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); | |
783 | #endif | |
784 | ||
785 | return current_pc; | |
786 | } | |
787 | ||
435e042a CV |
788 | /* Function: find_callers_reg |
789 | Find REGNUM on the stack. Otherwise, it's in an active register. | |
790 | One thing we might want to do here is to check REGNUM against the | |
791 | clobber mask, and somehow flag it as invalid if it isn't saved on | |
792 | the stack somewhere. This would provide a graceful failure mode | |
793 | when trying to get the value of caller-saves registers for an inner | |
794 | frame. */ | |
c906108c | 795 | |
a78f21af | 796 | static CORE_ADDR |
435e042a | 797 | v850_find_callers_reg (struct frame_info *fi, int regnum) |
c906108c | 798 | { |
11c02a10 | 799 | for (; fi; fi = get_next_frame (fi)) |
1e2330ba AC |
800 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
801 | get_frame_base (fi))) | |
802 | return deprecated_read_register_dummy (get_frame_pc (fi), | |
803 | get_frame_base (fi), regnum); | |
1b1d3794 AC |
804 | else if (deprecated_get_frame_saved_regs (fi)[regnum] != 0) |
805 | return read_memory_unsigned_integer (deprecated_get_frame_saved_regs (fi)[regnum], | |
435e042a | 806 | v850_register_raw_size (regnum)); |
c906108c | 807 | |
435e042a | 808 | return read_register (regnum); |
c906108c SS |
809 | } |
810 | ||
811 | /* Function: frame_chain | |
812 | Figure out the frame prior to FI. Unfortunately, this involves | |
813 | scanning the prologue of the caller, which will also be done | |
814 | shortly by v850_init_extra_frame_info. For the dummy frame, we | |
815 | just return the stack pointer that was in use at the time the | |
816 | function call was made. */ | |
817 | ||
a78f21af | 818 | static CORE_ADDR |
fba45db2 | 819 | v850_frame_chain (struct frame_info *fi) |
c906108c SS |
820 | { |
821 | struct prologue_info pi; | |
822 | CORE_ADDR callers_pc, fp; | |
823 | ||
824 | /* First, find out who called us */ | |
8bedc050 | 825 | callers_pc = DEPRECATED_FRAME_SAVED_PC (fi); |
c906108c | 826 | /* If caller is a call-dummy, then our FP bears no relation to his FP! */ |
435e042a | 827 | fp = v850_find_callers_reg (fi, E_FP_RAW_REGNUM); |
ae45cd16 | 828 | if (DEPRECATED_PC_IN_CALL_DUMMY (callers_pc, fp, fp)) |
c5aa993b | 829 | return fp; /* caller is call-dummy: return oldest value of FP */ |
c906108c SS |
830 | |
831 | /* Caller is NOT a call-dummy, so everything else should just work. | |
832 | Even if THIS frame is a call-dummy! */ | |
833 | pi.pifsrs = NULL; | |
834 | ||
835 | v850_scan_prologue (callers_pc, &pi); | |
836 | ||
837 | if (pi.start_function) | |
838 | return 0; /* Don't chain beyond the start function */ | |
839 | ||
435e042a | 840 | if (pi.framereg == E_FP_RAW_REGNUM) |
c906108c SS |
841 | return v850_find_callers_reg (fi, pi.framereg); |
842 | ||
1e2330ba | 843 | return get_frame_base (fi) - pi.frameoffset; |
c906108c SS |
844 | } |
845 | ||
c906108c SS |
846 | /* Function: skip_prologue |
847 | Return the address of the first code past the prologue of the function. */ | |
848 | ||
a78f21af | 849 | static CORE_ADDR |
fba45db2 | 850 | v850_skip_prologue (CORE_ADDR pc) |
c906108c SS |
851 | { |
852 | CORE_ADDR func_addr, func_end; | |
853 | ||
854 | /* See what the symbol table says */ | |
855 | ||
856 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
857 | { | |
858 | struct symtab_and_line sal; | |
859 | ||
860 | sal = find_pc_line (func_addr, 0); | |
861 | ||
862 | if (sal.line != 0 && sal.end < func_end) | |
863 | return sal.end; | |
864 | else | |
865 | /* Either there's no line info, or the line after the prologue is after | |
866 | the end of the function. In this case, there probably isn't a | |
867 | prologue. */ | |
868 | return pc; | |
869 | } | |
870 | ||
871 | /* We can't find the start of this function, so there's nothing we can do. */ | |
872 | return pc; | |
873 | } | |
874 | ||
875 | /* Function: pop_frame | |
876 | This routine gets called when either the user uses the `return' | |
877 | command, or the call dummy breakpoint gets hit. */ | |
878 | ||
a78f21af | 879 | static void |
435e042a | 880 | v850_pop_frame (void) |
c906108c | 881 | { |
435e042a | 882 | struct frame_info *frame = get_current_frame (); |
c906108c SS |
883 | int regnum; |
884 | ||
1e2330ba AC |
885 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (frame), |
886 | get_frame_base (frame), | |
887 | get_frame_base (frame))) | |
c906108c SS |
888 | generic_pop_dummy_frame (); |
889 | else | |
890 | { | |
8bedc050 | 891 | write_register (E_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame)); |
c906108c | 892 | |
435e042a | 893 | for (regnum = 0; regnum < E_NUM_REGS; regnum++) |
1b1d3794 | 894 | if (deprecated_get_frame_saved_regs (frame)[regnum] != 0) |
c906108c | 895 | write_register (regnum, |
1b1d3794 | 896 | read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum], |
435e042a | 897 | v850_register_raw_size (regnum))); |
c906108c | 898 | |
c193f6ac | 899 | write_register (E_SP_REGNUM, get_frame_base (frame)); |
c906108c SS |
900 | } |
901 | ||
902 | flush_cached_frames (); | |
903 | } | |
904 | ||
905 | /* Function: push_arguments | |
906 | Setup arguments and RP for a call to the target. First four args | |
907 | go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs | |
908 | are passed by reference. 64 bit quantities (doubles and long | |
909 | longs) may be split between the regs and the stack. When calling a | |
910 | function that returns a struct, a pointer to the struct is passed | |
911 | in as a secret first argument (always in R6). | |
912 | ||
913 | Stack space for the args has NOT been allocated: that job is up to us. | |
c5aa993b | 914 | */ |
c906108c | 915 | |
a78f21af | 916 | static CORE_ADDR |
ea7c478f | 917 | v850_push_arguments (int nargs, struct value **args, CORE_ADDR sp, |
435e042a | 918 | int struct_return, CORE_ADDR struct_addr) |
c906108c SS |
919 | { |
920 | int argreg; | |
921 | int argnum; | |
922 | int len = 0; | |
923 | int stack_offset; | |
924 | ||
925 | /* First, just for safety, make sure stack is aligned */ | |
926 | sp &= ~3; | |
927 | ||
70eb15a4 CV |
928 | /* The offset onto the stack at which we will start copying parameters |
929 | (after the registers are used up) begins at 16 rather than at zero. | |
930 | I don't really know why, that's just the way it seems to work. */ | |
931 | stack_offset = 16; | |
932 | ||
c906108c SS |
933 | /* Now make space on the stack for the args. */ |
934 | for (argnum = 0; argnum < nargs; argnum++) | |
c5aa993b | 935 | len += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); |
70eb15a4 | 936 | sp -= len + stack_offset; /* possibly over-allocating, but it works... */ |
c5aa993b JM |
937 | /* (you might think we could allocate 16 bytes */ |
938 | /* less, but the ABI seems to use it all! ) */ | |
c906108c | 939 | |
70eb15a4 | 940 | argreg = E_ARG0_REGNUM; |
c906108c SS |
941 | /* the struct_return pointer occupies the first parameter-passing reg */ |
942 | if (struct_return) | |
70eb15a4 | 943 | argreg++; |
c906108c SS |
944 | |
945 | /* Now load as many as possible of the first arguments into | |
946 | registers, and push the rest onto the stack. There are 16 bytes | |
947 | in four registers available. Loop thru args from first to last. */ | |
948 | for (argnum = 0; argnum < nargs; argnum++) | |
949 | { | |
950 | int len; | |
951 | char *val; | |
435e042a | 952 | char valbuf[v850_register_raw_size (E_ARG0_REGNUM)]; |
c906108c | 953 | |
70eb15a4 CV |
954 | if (!v850_type_is_scalar (VALUE_TYPE (*args)) |
955 | && TYPE_LENGTH (VALUE_TYPE (*args)) > E_MAX_RETTYPE_SIZE_IN_REGS) | |
c906108c | 956 | { |
fbd9dcd3 | 957 | store_unsigned_integer (valbuf, 4, VALUE_ADDRESS (*args)); |
c906108c SS |
958 | len = 4; |
959 | val = valbuf; | |
960 | } | |
961 | else | |
962 | { | |
963 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 964 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
965 | } |
966 | ||
967 | while (len > 0) | |
435e042a | 968 | if (argreg <= E_ARGLAST_REGNUM) |
c906108c SS |
969 | { |
970 | CORE_ADDR regval; | |
971 | ||
7c0b4a20 | 972 | regval = extract_unsigned_integer (val, v850_register_raw_size (argreg)); |
c906108c SS |
973 | write_register (argreg, regval); |
974 | ||
435e042a CV |
975 | len -= v850_register_raw_size (argreg); |
976 | val += v850_register_raw_size (argreg); | |
c906108c SS |
977 | argreg++; |
978 | } | |
979 | else | |
980 | { | |
981 | write_memory (sp + stack_offset, val, 4); | |
982 | ||
983 | len -= 4; | |
984 | val += 4; | |
985 | stack_offset += 4; | |
986 | } | |
987 | args++; | |
988 | } | |
989 | return sp; | |
990 | } | |
991 | ||
992 | /* Function: push_return_address (pc) | |
993 | Set up the return address for the inferior function call. | |
994 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 995 | |
a78f21af | 996 | static CORE_ADDR |
fba45db2 | 997 | v850_push_return_address (CORE_ADDR pc, CORE_ADDR sp) |
c906108c | 998 | { |
88a82a65 | 999 | write_register (E_RP_REGNUM, entry_point_address ()); |
c906108c SS |
1000 | return sp; |
1001 | } | |
c5aa993b | 1002 | |
c906108c | 1003 | /* Function: frame_saved_pc |
435e042a | 1004 | Find the caller of this frame. We do this by seeing if E_RP_REGNUM |
c906108c SS |
1005 | is saved in the stack anywhere, otherwise we get it from the |
1006 | registers. If the inner frame is a dummy frame, return its PC | |
1007 | instead of RP, because that's where "caller" of the dummy-frame | |
1008 | will be found. */ | |
1009 | ||
a78f21af | 1010 | static CORE_ADDR |
fba45db2 | 1011 | v850_frame_saved_pc (struct frame_info *fi) |
c906108c | 1012 | { |
1e2330ba AC |
1013 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
1014 | get_frame_base (fi))) | |
1015 | return deprecated_read_register_dummy (get_frame_pc (fi), | |
1016 | get_frame_base (fi), E_PC_REGNUM); | |
c906108c | 1017 | else |
435e042a | 1018 | return v850_find_callers_reg (fi, E_RP_REGNUM); |
c906108c SS |
1019 | } |
1020 | ||
c906108c SS |
1021 | |
1022 | /* Function: fix_call_dummy | |
1023 | Pokes the callee function's address into the CALL_DUMMY assembly stub. | |
1024 | Assumes that the CALL_DUMMY looks like this: | |
c5aa993b JM |
1025 | jarl <offset24>, r31 |
1026 | trap | |
1027 | */ | |
c906108c | 1028 | |
a78f21af | 1029 | static void |
fba45db2 | 1030 | v850_fix_call_dummy (char *dummy, CORE_ADDR sp, CORE_ADDR fun, int nargs, |
ea7c478f | 1031 | struct value **args, struct type *type, int gcc_p) |
c906108c SS |
1032 | { |
1033 | long offset24; | |
1034 | ||
1035 | offset24 = (long) fun - (long) entry_point_address (); | |
1036 | offset24 &= 0x3fffff; | |
1037 | offset24 |= 0xff800000; /* jarl <offset24>, r31 */ | |
1038 | ||
c5aa993b JM |
1039 | store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff); |
1040 | store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16); | |
435e042a CV |
1041 | } |
1042 | ||
1043 | static CORE_ADDR | |
1044 | v850_saved_pc_after_call (struct frame_info *ignore) | |
1045 | { | |
1046 | return read_register (E_RP_REGNUM); | |
1047 | } | |
1048 | ||
1049 | static void | |
1050 | v850_extract_return_value (struct type *type, char *regbuf, char *valbuf) | |
1051 | { | |
70eb15a4 CV |
1052 | CORE_ADDR return_buffer; |
1053 | ||
1054 | if (!v850_use_struct_convention (0, type)) | |
1055 | { | |
1056 | /* Scalar return values of <= 8 bytes are returned in | |
1057 | E_V0_REGNUM to E_V1_REGNUM. */ | |
1058 | memcpy (valbuf, | |
62700349 | 1059 | ®buf[DEPRECATED_REGISTER_BYTE (E_V0_REGNUM)], |
70eb15a4 CV |
1060 | TYPE_LENGTH (type)); |
1061 | } | |
1062 | else | |
1063 | { | |
1064 | /* Aggregates and return values > 8 bytes are returned in memory, | |
1065 | pointed to by R6. */ | |
1066 | return_buffer = | |
62700349 | 1067 | extract_unsigned_integer (regbuf + DEPRECATED_REGISTER_BYTE (E_V0_REGNUM), |
12c266ea | 1068 | DEPRECATED_REGISTER_RAW_SIZE (E_V0_REGNUM)); |
70eb15a4 CV |
1069 | |
1070 | read_memory (return_buffer, valbuf, TYPE_LENGTH (type)); | |
1071 | } | |
435e042a CV |
1072 | } |
1073 | ||
1074 | const static unsigned char * | |
1075 | v850_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) | |
1076 | { | |
1077 | static unsigned char breakpoint[] = { 0x85, 0x05 }; | |
1078 | *lenptr = sizeof (breakpoint); | |
1079 | return breakpoint; | |
1080 | } | |
1081 | ||
435e042a CV |
1082 | static void |
1083 | v850_store_return_value (struct type *type, char *valbuf) | |
1084 | { | |
70eb15a4 CV |
1085 | CORE_ADDR return_buffer; |
1086 | ||
1087 | if (!v850_use_struct_convention (0, type)) | |
62700349 | 1088 | deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (E_V0_REGNUM), valbuf, |
73937e03 | 1089 | TYPE_LENGTH (type)); |
70eb15a4 CV |
1090 | else |
1091 | { | |
1092 | return_buffer = read_register (E_V0_REGNUM); | |
1093 | write_memory (return_buffer, valbuf, TYPE_LENGTH (type)); | |
1094 | } | |
435e042a CV |
1095 | } |
1096 | ||
1097 | static void | |
1098 | v850_frame_init_saved_regs (struct frame_info *fi) | |
1099 | { | |
1100 | struct prologue_info pi; | |
1101 | struct pifsr pifsrs[E_NUM_REGS + 1], *pifsr; | |
1102 | CORE_ADDR func_addr, func_end; | |
1103 | ||
1b1d3794 | 1104 | if (!deprecated_get_frame_saved_regs (fi)) |
435e042a CV |
1105 | { |
1106 | frame_saved_regs_zalloc (fi); | |
1107 | ||
1108 | /* The call dummy doesn't save any registers on the stack, so we | |
1109 | can return now. */ | |
1e2330ba AC |
1110 | if (DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (fi), get_frame_base (fi), |
1111 | get_frame_base (fi))) | |
435e042a CV |
1112 | return; |
1113 | ||
1114 | /* Find the beginning of this function, so we can analyze its | |
1115 | prologue. */ | |
50abf9e5 | 1116 | if (find_pc_partial_function (get_frame_pc (fi), NULL, &func_addr, &func_end)) |
435e042a CV |
1117 | { |
1118 | pi.pifsrs = pifsrs; | |
1119 | ||
50abf9e5 | 1120 | v850_scan_prologue (get_frame_pc (fi), &pi); |
435e042a | 1121 | |
11c02a10 | 1122 | if (!get_next_frame (fi) && pi.framereg == E_SP_REGNUM) |
8ccd593b | 1123 | deprecated_update_frame_base_hack (fi, read_register (pi.framereg) - pi.frameoffset); |
435e042a CV |
1124 | |
1125 | for (pifsr = pifsrs; pifsr->framereg; pifsr++) | |
1126 | { | |
1b1d3794 | 1127 | deprecated_get_frame_saved_regs (fi)[pifsr->reg] = pifsr->offset + get_frame_base (fi); |
435e042a CV |
1128 | |
1129 | if (pifsr->framereg == E_SP_REGNUM) | |
1b1d3794 | 1130 | deprecated_get_frame_saved_regs (fi)[pifsr->reg] += pi.frameoffset; |
435e042a CV |
1131 | } |
1132 | } | |
1133 | /* Else we're out of luck (can't debug completely stripped code). | |
1134 | FIXME. */ | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /* Function: init_extra_frame_info | |
1139 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
1140 | registers. Most of the work is done in scan_prologue(). | |
1141 | ||
1142 | Note that when we are called for the last frame (currently active frame), | |
50abf9e5 | 1143 | that get_frame_pc (fi) and fi->frame will already be setup. However, fi->frame will |
435e042a CV |
1144 | be valid only if this routine uses FP. For previous frames, fi-frame will |
1145 | always be correct (since that is derived from v850_frame_chain ()). | |
1146 | ||
04714b91 AC |
1147 | We can be called with the PC in the call dummy under two |
1148 | circumstances. First, during normal backtracing, second, while | |
1149 | figuring out the frame pointer just prior to calling the target | |
1150 | function (see call_function_by_hand). */ | |
435e042a CV |
1151 | |
1152 | static void | |
1153 | v850_init_extra_frame_info (int fromleaf, struct frame_info *fi) | |
1154 | { | |
1155 | struct prologue_info pi; | |
1156 | ||
11c02a10 | 1157 | if (get_next_frame (fi)) |
8bedc050 | 1158 | deprecated_update_frame_pc_hack (fi, DEPRECATED_FRAME_SAVED_PC (get_next_frame (fi))); |
435e042a CV |
1159 | |
1160 | v850_frame_init_saved_regs (fi); | |
1161 | } | |
1162 | ||
1163 | static void | |
70eb15a4 | 1164 | v850_store_struct_return (CORE_ADDR addr, CORE_ADDR sp) |
435e042a | 1165 | { |
70eb15a4 | 1166 | write_register (E_ARG0_REGNUM, addr); |
435e042a CV |
1167 | } |
1168 | ||
1169 | static CORE_ADDR | |
1170 | v850_target_read_fp (void) | |
1171 | { | |
1172 | return read_register (E_FP_RAW_REGNUM); | |
c906108c SS |
1173 | } |
1174 | ||
6ed14b0e CV |
1175 | static struct gdbarch * |
1176 | v850_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
c906108c | 1177 | { |
435e042a | 1178 | static LONGEST call_dummy_words[1] = { 0 }; |
6ed14b0e CV |
1179 | struct gdbarch_tdep *tdep = NULL; |
1180 | struct gdbarch *gdbarch; | |
1181 | int i; | |
1182 | ||
1183 | /* find a candidate among the list of pre-declared architectures. */ | |
1184 | arches = gdbarch_list_lookup_by_info (arches, &info); | |
1185 | if (arches != NULL) | |
1186 | return (arches->gdbarch); | |
c906108c | 1187 | |
6ed14b0e CV |
1188 | #if 0 |
1189 | tdep = (struct gdbarch_tdep *) xmalloc (sizeof (struct gdbarch_tdep)); | |
1190 | #endif | |
1191 | ||
435e042a | 1192 | /* Change the register names based on the current machine type. */ |
6ed14b0e | 1193 | if (info.bfd_arch_info->arch != bfd_arch_v850) |
c906108c SS |
1194 | return 0; |
1195 | ||
6ed14b0e CV |
1196 | gdbarch = gdbarch_alloc (&info, 0); |
1197 | ||
a5afb99f AC |
1198 | /* NOTE: cagney/2002-12-06: This can be deleted when this arch is |
1199 | ready to unwind the PC first (see frame.c:get_prev_frame()). */ | |
0968aa8c | 1200 | set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default); |
a5afb99f | 1201 | |
c906108c SS |
1202 | for (i = 0; v850_processor_type_table[i].regnames != NULL; i++) |
1203 | { | |
6ed14b0e | 1204 | if (v850_processor_type_table[i].mach == info.bfd_arch_info->mach) |
435e042a CV |
1205 | { |
1206 | v850_register_names = v850_processor_type_table[i].regnames; | |
435e042a CV |
1207 | break; |
1208 | } | |
c906108c SS |
1209 | } |
1210 | ||
435e042a CV |
1211 | /* |
1212 | * Basic register fields and methods. | |
1213 | */ | |
1214 | set_gdbarch_num_regs (gdbarch, E_NUM_REGS); | |
1215 | set_gdbarch_num_pseudo_regs (gdbarch, 0); | |
1216 | set_gdbarch_sp_regnum (gdbarch, E_SP_REGNUM); | |
0ba6dca9 | 1217 | set_gdbarch_deprecated_fp_regnum (gdbarch, E_FP_REGNUM); |
435e042a CV |
1218 | set_gdbarch_pc_regnum (gdbarch, E_PC_REGNUM); |
1219 | set_gdbarch_register_name (gdbarch, v850_register_name); | |
b1e29e33 | 1220 | set_gdbarch_deprecated_register_size (gdbarch, v850_reg_size); |
b8b527c5 | 1221 | set_gdbarch_deprecated_register_bytes (gdbarch, E_ALL_REGS_SIZE); |
9c04cab7 AC |
1222 | set_gdbarch_deprecated_register_byte (gdbarch, v850_register_byte); |
1223 | set_gdbarch_deprecated_register_raw_size (gdbarch, v850_register_raw_size); | |
a0ed5532 | 1224 | set_gdbarch_deprecated_max_register_raw_size (gdbarch, v850_reg_size); |
9c04cab7 | 1225 | set_gdbarch_deprecated_register_virtual_size (gdbarch, v850_register_raw_size); |
a0ed5532 | 1226 | set_gdbarch_deprecated_max_register_virtual_size (gdbarch, v850_reg_size); |
9c04cab7 | 1227 | set_gdbarch_deprecated_register_virtual_type (gdbarch, v850_reg_virtual_type); |
435e042a | 1228 | |
0ba6dca9 | 1229 | set_gdbarch_deprecated_target_read_fp (gdbarch, v850_target_read_fp); |
435e042a CV |
1230 | |
1231 | /* | |
1232 | * Frame Info | |
1233 | */ | |
f30ee0bc | 1234 | set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, v850_frame_init_saved_regs); |
e9582e71 | 1235 | set_gdbarch_deprecated_init_extra_frame_info (gdbarch, v850_init_extra_frame_info); |
618ce49f | 1236 | set_gdbarch_deprecated_frame_chain (gdbarch, v850_frame_chain); |
6913c89a | 1237 | set_gdbarch_deprecated_saved_pc_after_call (gdbarch, v850_saved_pc_after_call); |
8bedc050 | 1238 | set_gdbarch_deprecated_frame_saved_pc (gdbarch, v850_frame_saved_pc); |
435e042a | 1239 | set_gdbarch_skip_prologue (gdbarch, v850_skip_prologue); |
435e042a CV |
1240 | |
1241 | /* | |
1242 | * Miscelany | |
1243 | */ | |
1244 | /* Stack grows up. */ | |
1245 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
435e042a CV |
1246 | |
1247 | /* | |
1248 | * Call Dummies | |
1249 | * | |
1250 | * These values and methods are used when gdb calls a target function. */ | |
28f617b3 | 1251 | set_gdbarch_deprecated_push_return_address (gdbarch, v850_push_return_address); |
26e9b323 | 1252 | set_gdbarch_deprecated_extract_return_value (gdbarch, v850_extract_return_value); |
b81774d8 | 1253 | set_gdbarch_deprecated_push_arguments (gdbarch, v850_push_arguments); |
749b82f6 | 1254 | set_gdbarch_deprecated_pop_frame (gdbarch, v850_pop_frame); |
4183d812 | 1255 | set_gdbarch_deprecated_store_struct_return (gdbarch, v850_store_struct_return); |
ebba8386 | 1256 | set_gdbarch_deprecated_store_return_value (gdbarch, v850_store_return_value); |
435e042a | 1257 | set_gdbarch_use_struct_convention (gdbarch, v850_use_struct_convention); |
b1e29e33 AC |
1258 | set_gdbarch_deprecated_call_dummy_words (gdbarch, call_dummy_nil); |
1259 | set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, 0); | |
1260 | set_gdbarch_deprecated_fix_call_dummy (gdbarch, v850_fix_call_dummy); | |
435e042a CV |
1261 | set_gdbarch_breakpoint_from_pc (gdbarch, v850_breakpoint_from_pc); |
1262 | ||
1263 | set_gdbarch_int_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1264 | set_gdbarch_ptr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1265 | set_gdbarch_addr_bit (gdbarch, 4 * TARGET_CHAR_BIT); | |
1266 | set_gdbarch_long_double_bit (gdbarch, 8 * TARGET_CHAR_BIT); | |
1267 | ||
6c0e89ed | 1268 | /* Should be using push_dummy_call. */ |
b46e02f6 | 1269 | set_gdbarch_deprecated_dummy_write_sp (gdbarch, deprecated_write_sp); |
6c0e89ed | 1270 | |
36482093 AC |
1271 | set_gdbarch_print_insn (gdbarch, print_insn_v850); |
1272 | ||
6ed14b0e | 1273 | return gdbarch; |
c906108c SS |
1274 | } |
1275 | ||
a78f21af AC |
1276 | extern initialize_file_ftype _initialize_v850_tdep; /* -Wmissing-prototypes */ |
1277 | ||
c906108c | 1278 | void |
fba45db2 | 1279 | _initialize_v850_tdep (void) |
c906108c | 1280 | { |
6ed14b0e | 1281 | register_gdbarch_init (bfd_arch_v850, v850_gdbarch_init); |
c906108c | 1282 | } |