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c906108c SS |
1 | /* Target-dependent code for the NEC V850 for GDB, the GNU debugger. |
2 | Copyright 1996, Free Software Foundation, Inc. | |
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" | |
31 | ||
32 | ||
33 | static char *v850_generic_reg_names[] = REGISTER_NAMES; | |
34 | ||
35 | static char *v850e_reg_names[] = | |
36 | { | |
37 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
38 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", | |
39 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
40 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", | |
41 | "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", | |
42 | "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", | |
43 | "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23", | |
44 | "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31", | |
45 | "pc", "fp" | |
46 | }; | |
47 | ||
48 | char **v850_register_names = v850_generic_reg_names; | |
49 | ||
50 | struct | |
c5aa993b JM |
51 | { |
52 | char **regnames; | |
53 | int mach; | |
54 | } | |
55 | v850_processor_type_table[] = | |
c906108c | 56 | { |
c5aa993b JM |
57 | { |
58 | v850_generic_reg_names, bfd_mach_v850 | |
59 | } | |
60 | , | |
61 | { | |
62 | v850e_reg_names, bfd_mach_v850e | |
63 | } | |
64 | , | |
65 | { | |
66 | v850e_reg_names, bfd_mach_v850ea | |
67 | } | |
68 | , | |
69 | { | |
70 | NULL, 0 | |
71 | } | |
c906108c SS |
72 | }; |
73 | ||
74 | /* Info gleaned from scanning a function's prologue. */ | |
75 | ||
76 | struct pifsr /* Info about one saved reg */ | |
c5aa993b JM |
77 | { |
78 | int framereg; /* Frame reg (SP or FP) */ | |
79 | int offset; /* Offset from framereg */ | |
80 | int cur_frameoffset; /* Current frameoffset */ | |
81 | int reg; /* Saved register number */ | |
82 | }; | |
c906108c SS |
83 | |
84 | struct prologue_info | |
c5aa993b JM |
85 | { |
86 | int framereg; | |
87 | int frameoffset; | |
88 | int start_function; | |
89 | struct pifsr *pifsrs; | |
90 | }; | |
c906108c | 91 | |
a14ed312 | 92 | static CORE_ADDR v850_scan_prologue (CORE_ADDR pc, struct prologue_info *fs); |
c906108c SS |
93 | |
94 | ||
95 | /* Should call_function allocate stack space for a struct return? */ | |
96 | int | |
97 | v850_use_struct_convention (gcc_p, type) | |
98 | int gcc_p; | |
99 | struct type *type; | |
100 | { | |
101 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 4); | |
102 | } | |
c906108c SS |
103 | \f |
104 | ||
c5aa993b | 105 | |
c906108c | 106 | /* Structure for mapping bits in register lists to register numbers. */ |
c5aa993b | 107 | struct reg_list |
c906108c SS |
108 | { |
109 | long mask; | |
110 | int regno; | |
111 | }; | |
112 | ||
113 | /* Helper function for v850_scan_prologue to handle prepare instruction. */ | |
114 | ||
115 | static void | |
c5aa993b | 116 | handle_prepare (int insn, int insn2, CORE_ADDR * current_pc_ptr, |
c906108c SS |
117 | struct prologue_info *pi, struct pifsr **pifsr_ptr) |
118 | ||
119 | { | |
120 | CORE_ADDR current_pc = *current_pc_ptr; | |
121 | struct pifsr *pifsr = *pifsr_ptr; | |
122 | long next = insn2 & 0xffff; | |
123 | long list12 = ((insn & 1) << 16) + (next & 0xffe0); | |
124 | long offset = (insn & 0x3e) << 1; | |
c5aa993b | 125 | static struct reg_list reg_table[] = |
c906108c | 126 | { |
c5aa993b JM |
127 | {0x00800, 20}, /* r20 */ |
128 | {0x00400, 21}, /* r21 */ | |
129 | {0x00200, 22}, /* r22 */ | |
130 | {0x00100, 23}, /* r23 */ | |
131 | {0x08000, 24}, /* r24 */ | |
132 | {0x04000, 25}, /* r25 */ | |
133 | {0x02000, 26}, /* r26 */ | |
134 | {0x01000, 27}, /* r27 */ | |
135 | {0x00080, 28}, /* r28 */ | |
136 | {0x00040, 29}, /* r29 */ | |
137 | {0x10000, 30}, /* ep */ | |
138 | {0x00020, 31}, /* lp */ | |
139 | {0, 0} /* end of table */ | |
c906108c SS |
140 | }; |
141 | int i; | |
142 | ||
c5aa993b | 143 | if ((next & 0x1f) == 0x0b) /* skip imm16 argument */ |
c906108c SS |
144 | current_pc += 2; |
145 | else if ((next & 0x1f) == 0x13) /* skip imm16 argument */ | |
146 | current_pc += 2; | |
147 | else if ((next & 0x1f) == 0x1b) /* skip imm32 argument */ | |
148 | current_pc += 4; | |
149 | ||
150 | /* Calculate the total size of the saved registers, and add it | |
151 | it to the immediate value used to adjust SP. */ | |
152 | for (i = 0; reg_table[i].mask != 0; i++) | |
153 | if (list12 & reg_table[i].mask) | |
154 | offset += REGISTER_RAW_SIZE (regtable[i].regno); | |
155 | pi->frameoffset -= offset; | |
156 | ||
157 | /* Calculate the offsets of the registers relative to the value | |
158 | the SP will have after the registers have been pushed and the | |
159 | imm5 value has been subtracted from it. */ | |
160 | if (pifsr) | |
161 | { | |
162 | for (i = 0; reg_table[i].mask != 0; i++) | |
163 | { | |
164 | if (list12 & reg_table[i].mask) | |
165 | { | |
166 | int reg = reg_table[i].regno; | |
167 | offset -= REGISTER_RAW_SIZE (reg); | |
168 | pifsr->reg = reg; | |
169 | pifsr->offset = offset; | |
170 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 171 | #ifdef DEBUG |
c906108c | 172 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 173 | #endif |
c906108c SS |
174 | pifsr++; |
175 | } | |
176 | } | |
177 | } | |
178 | #ifdef DEBUG | |
179 | printf_filtered ("\tfound ctret after regsave func"); | |
180 | #endif | |
181 | ||
182 | /* Set result parameters. */ | |
183 | *current_pc_ptr = current_pc; | |
184 | *pifsr_ptr = pifsr; | |
185 | } | |
186 | ||
187 | ||
188 | /* Helper function for v850_scan_prologue to handle pushm/pushl instructions. | |
189 | FIXME: the SR bit of the register list is not supported; must check | |
190 | that the compiler does not ever generate this bit. */ | |
191 | ||
192 | static void | |
193 | handle_pushm (int insn, int insn2, struct prologue_info *pi, | |
c5aa993b | 194 | struct pifsr **pifsr_ptr) |
c906108c SS |
195 | |
196 | { | |
197 | struct pifsr *pifsr = *pifsr_ptr; | |
198 | long list12 = ((insn & 0x0f) << 16) + (insn2 & 0xfff0); | |
199 | long offset = 0; | |
c5aa993b | 200 | static struct reg_list pushml_reg_table[] = |
c906108c | 201 | { |
c5aa993b JM |
202 | {0x80000, PS_REGNUM}, /* PSW */ |
203 | {0x40000, 1}, /* r1 */ | |
204 | {0x20000, 2}, /* r2 */ | |
205 | {0x10000, 3}, /* r3 */ | |
206 | {0x00800, 4}, /* r4 */ | |
207 | {0x00400, 5}, /* r5 */ | |
208 | {0x00200, 6}, /* r6 */ | |
209 | {0x00100, 7}, /* r7 */ | |
210 | {0x08000, 8}, /* r8 */ | |
211 | {0x04000, 9}, /* r9 */ | |
212 | {0x02000, 10}, /* r10 */ | |
213 | {0x01000, 11}, /* r11 */ | |
214 | {0x00080, 12}, /* r12 */ | |
215 | {0x00040, 13}, /* r13 */ | |
216 | {0x00020, 14}, /* r14 */ | |
217 | {0x00010, 15}, /* r15 */ | |
218 | {0, 0} /* end of table */ | |
c906108c | 219 | }; |
c5aa993b | 220 | static struct reg_list pushmh_reg_table[] = |
c906108c | 221 | { |
c5aa993b JM |
222 | {0x80000, 16}, /* r16 */ |
223 | {0x40000, 17}, /* r17 */ | |
224 | {0x20000, 18}, /* r18 */ | |
225 | {0x10000, 19}, /* r19 */ | |
226 | {0x00800, 20}, /* r20 */ | |
227 | {0x00400, 21}, /* r21 */ | |
228 | {0x00200, 22}, /* r22 */ | |
229 | {0x00100, 23}, /* r23 */ | |
230 | {0x08000, 24}, /* r24 */ | |
231 | {0x04000, 25}, /* r25 */ | |
232 | {0x02000, 26}, /* r26 */ | |
233 | {0x01000, 27}, /* r27 */ | |
234 | {0x00080, 28}, /* r28 */ | |
235 | {0x00040, 29}, /* r29 */ | |
236 | {0x00010, 30}, /* r30 */ | |
237 | {0x00020, 31}, /* r31 */ | |
238 | {0, 0} /* end of table */ | |
c906108c SS |
239 | }; |
240 | struct reg_list *reg_table; | |
241 | int i; | |
242 | ||
243 | /* Is this a pushml or a pushmh? */ | |
244 | if ((insn2 & 7) == 1) | |
245 | reg_table = pushml_reg_table; | |
246 | else | |
247 | reg_table = pushmh_reg_table; | |
248 | ||
249 | /* Calculate the total size of the saved registers, and add it | |
250 | it to the immediate value used to adjust SP. */ | |
251 | for (i = 0; reg_table[i].mask != 0; i++) | |
252 | if (list12 & reg_table[i].mask) | |
253 | offset += REGISTER_RAW_SIZE (regtable[i].regno); | |
254 | pi->frameoffset -= offset; | |
255 | ||
256 | /* Calculate the offsets of the registers relative to the value | |
257 | the SP will have after the registers have been pushed and the | |
258 | imm5 value is subtracted from it. */ | |
259 | if (pifsr) | |
260 | { | |
261 | for (i = 0; reg_table[i].mask != 0; i++) | |
262 | { | |
263 | if (list12 & reg_table[i].mask) | |
264 | { | |
265 | int reg = reg_table[i].regno; | |
266 | offset -= REGISTER_RAW_SIZE (reg); | |
267 | pifsr->reg = reg; | |
268 | pifsr->offset = offset; | |
269 | pifsr->cur_frameoffset = pi->frameoffset; | |
c5aa993b | 270 | #ifdef DEBUG |
c906108c | 271 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); |
c5aa993b | 272 | #endif |
c906108c SS |
273 | pifsr++; |
274 | } | |
275 | } | |
276 | } | |
277 | #ifdef DEBUG | |
278 | printf_filtered ("\tfound ctret after regsave func"); | |
279 | #endif | |
280 | ||
281 | /* Set result parameters. */ | |
282 | *pifsr_ptr = pifsr; | |
283 | } | |
c5aa993b | 284 | \f |
c906108c SS |
285 | |
286 | ||
287 | ||
c906108c SS |
288 | /* Function: scan_prologue |
289 | Scan the prologue of the function that contains PC, and record what | |
290 | we find in PI. PI->fsr must be zeroed by the called. Returns the | |
291 | pc after the prologue. Note that the addresses saved in pi->fsr | |
292 | are actually just frame relative (negative offsets from the frame | |
293 | pointer). This is because we don't know the actual value of the | |
294 | frame pointer yet. In some circumstances, the frame pointer can't | |
295 | be determined till after we have scanned the prologue. */ | |
296 | ||
297 | static CORE_ADDR | |
298 | v850_scan_prologue (pc, pi) | |
299 | CORE_ADDR pc; | |
300 | struct prologue_info *pi; | |
301 | { | |
302 | CORE_ADDR func_addr, prologue_end, current_pc; | |
303 | struct pifsr *pifsr, *pifsr_tmp; | |
304 | int fp_used; | |
305 | int ep_used; | |
306 | int reg; | |
307 | CORE_ADDR save_pc, save_end; | |
308 | int regsave_func_p; | |
309 | int r12_tmp; | |
310 | ||
311 | /* First, figure out the bounds of the prologue so that we can limit the | |
312 | search to something reasonable. */ | |
313 | ||
314 | if (find_pc_partial_function (pc, NULL, &func_addr, NULL)) | |
315 | { | |
316 | struct symtab_and_line sal; | |
317 | ||
318 | sal = find_pc_line (func_addr, 0); | |
319 | ||
320 | if (func_addr == entry_point_address ()) | |
321 | pi->start_function = 1; | |
322 | else | |
323 | pi->start_function = 0; | |
324 | ||
325 | #if 0 | |
326 | if (sal.line == 0) | |
327 | prologue_end = pc; | |
328 | else | |
329 | prologue_end = sal.end; | |
330 | #else | |
331 | prologue_end = pc; | |
332 | #endif | |
333 | } | |
334 | else | |
335 | { /* We're in the boondocks */ | |
336 | func_addr = pc - 100; | |
337 | prologue_end = pc; | |
338 | } | |
339 | ||
340 | prologue_end = min (prologue_end, pc); | |
341 | ||
342 | /* Now, search the prologue looking for instructions that setup fp, save | |
343 | rp, adjust sp and such. We also record the frame offset of any saved | |
c5aa993b | 344 | registers. */ |
c906108c SS |
345 | |
346 | pi->frameoffset = 0; | |
347 | pi->framereg = SP_REGNUM; | |
348 | fp_used = 0; | |
349 | ep_used = 0; | |
350 | pifsr = pi->pifsrs; | |
351 | regsave_func_p = 0; | |
352 | save_pc = 0; | |
353 | save_end = 0; | |
354 | r12_tmp = 0; | |
355 | ||
356 | #ifdef DEBUG | |
357 | printf_filtered ("Current_pc = 0x%.8lx, prologue_end = 0x%.8lx\n", | |
c5aa993b | 358 | (long) func_addr, (long) prologue_end); |
c906108c SS |
359 | #endif |
360 | ||
c5aa993b | 361 | for (current_pc = func_addr; current_pc < prologue_end;) |
c906108c SS |
362 | { |
363 | int insn, insn2; | |
364 | ||
365 | #ifdef DEBUG | |
c5aa993b | 366 | printf_filtered ("0x%.8lx ", (long) current_pc); |
c906108c SS |
367 | (*tm_print_insn) (current_pc, &tm_print_insn_info); |
368 | #endif | |
369 | ||
370 | insn = read_memory_unsigned_integer (current_pc, 2); | |
371 | current_pc += 2; | |
c5aa993b | 372 | if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */ |
c906108c SS |
373 | { |
374 | insn2 = read_memory_unsigned_integer (current_pc, 2); | |
375 | current_pc += 2; | |
376 | } | |
377 | ||
378 | if ((insn & 0xffc0) == ((10 << 11) | 0x0780) && !regsave_func_p) | |
379 | { /* jarl <func>,10 */ | |
c5aa993b | 380 | long low_disp = insn2 & ~(long) 1; |
c906108c | 381 | long disp = (((((insn & 0x3f) << 16) + low_disp) |
c5aa993b | 382 | & ~(long) 1) ^ 0x00200000) - 0x00200000; |
c906108c SS |
383 | |
384 | save_pc = current_pc; | |
385 | save_end = prologue_end; | |
386 | regsave_func_p = 1; | |
387 | current_pc += disp - 4; | |
388 | prologue_end = (current_pc | |
389 | + (2 * 3) /* moves to/from ep */ | |
c5aa993b JM |
390 | + 4 /* addi <const>,sp,sp */ |
391 | + 2 /* jmp [r10] */ | |
c906108c SS |
392 | + (2 * 12) /* sst.w to save r2, r20-r29, r31 */ |
393 | + 20); /* slop area */ | |
394 | ||
395 | #ifdef DEBUG | |
396 | printf_filtered ("\tfound jarl <func>,r10, disp = %ld, low_disp = %ld, new pc = 0x%.8lx\n", | |
c5aa993b | 397 | disp, low_disp, (long) current_pc + 2); |
c906108c SS |
398 | #endif |
399 | continue; | |
400 | } | |
401 | else if ((insn & 0xffc0) == 0x0200 && !regsave_func_p) | |
402 | { /* callt <imm6> */ | |
403 | long ctbp = read_register (CTBP_REGNUM); | |
404 | long adr = ctbp + ((insn & 0x3f) << 1); | |
405 | ||
406 | save_pc = current_pc; | |
407 | save_end = prologue_end; | |
408 | regsave_func_p = 1; | |
409 | current_pc = ctbp + (read_memory_unsigned_integer (adr, 2) & 0xffff); | |
410 | prologue_end = (current_pc | |
411 | + (2 * 3) /* prepare list2,imm5,sp/imm */ | |
c5aa993b | 412 | + 4 /* ctret */ |
c906108c SS |
413 | + 20); /* slop area */ |
414 | ||
415 | #ifdef DEBUG | |
416 | printf_filtered ("\tfound callt, ctbp = 0x%.8lx, adr = %.8lx, new pc = 0x%.8lx\n", | |
c5aa993b | 417 | ctbp, adr, (long) current_pc); |
c906108c SS |
418 | #endif |
419 | continue; | |
420 | } | |
421 | else if ((insn & 0xffc0) == 0x0780) /* prepare list2,imm5 */ | |
422 | { | |
423 | handle_prepare (insn, insn2, ¤t_pc, pi, &pifsr); | |
424 | continue; | |
425 | } | |
426 | else if (insn == 0x07e0 && regsave_func_p && insn2 == 0x0144) | |
427 | { /* ctret after processing register save function */ | |
428 | current_pc = save_pc; | |
429 | prologue_end = save_end; | |
430 | regsave_func_p = 0; | |
431 | #ifdef DEBUG | |
432 | printf_filtered ("\tfound ctret after regsave func"); | |
433 | #endif | |
434 | continue; | |
435 | } | |
436 | else if ((insn & 0xfff0) == 0x07e0 && (insn2 & 5) == 1) | |
437 | { /* pushml, pushmh */ | |
438 | handle_pushm (insn, insn2, pi, &pifsr); | |
439 | continue; | |
440 | } | |
441 | else if ((insn & 0xffe0) == 0x0060 && regsave_func_p) | |
442 | { /* jmp after processing register save function */ | |
443 | current_pc = save_pc; | |
444 | prologue_end = save_end; | |
445 | regsave_func_p = 0; | |
446 | #ifdef DEBUG | |
447 | printf_filtered ("\tfound jmp after regsave func"); | |
448 | #endif | |
449 | continue; | |
450 | } | |
451 | else if ((insn & 0x07c0) == 0x0780 /* jarl or jr */ | |
452 | || (insn & 0xffe0) == 0x0060 /* jmp */ | |
453 | || (insn & 0x0780) == 0x0580) /* branch */ | |
454 | { | |
455 | #ifdef DEBUG | |
456 | printf_filtered ("\n"); | |
457 | #endif | |
c5aa993b | 458 | break; /* Ran into end of prologue */ |
c906108c SS |
459 | } |
460 | ||
461 | else if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */ | |
462 | pi->frameoffset += ((insn & 0x1f) ^ 0x10) - 0x10; | |
463 | else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */ | |
464 | pi->frameoffset += insn2; | |
465 | else if (insn == ((FP_RAW_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,fp */ | |
466 | { | |
467 | fp_used = 1; | |
468 | pi->framereg = FP_RAW_REGNUM; | |
469 | } | |
470 | ||
471 | else if (insn == ((R12_REGNUM << 11) | 0x0640 | R0_REGNUM)) /* movhi hi(const),r0,r12 */ | |
472 | r12_tmp = insn2 << 16; | |
473 | else if (insn == ((R12_REGNUM << 11) | 0x0620 | R12_REGNUM)) /* movea lo(const),r12,r12 */ | |
474 | r12_tmp += insn2; | |
c5aa993b | 475 | else if (insn == ((SP_REGNUM << 11) | 0x01c0 | R12_REGNUM) && r12_tmp) /* add r12,sp */ |
c906108c SS |
476 | pi->frameoffset = r12_tmp; |
477 | else if (insn == ((EP_REGNUM << 11) | 0x0000 | SP_REGNUM)) /* mov sp,ep */ | |
478 | ep_used = 1; | |
479 | else if (insn == ((EP_REGNUM << 11) | 0x0000 | R1_REGNUM)) /* mov r1,ep */ | |
480 | ep_used = 0; | |
c5aa993b | 481 | else if (((insn & 0x07ff) == (0x0760 | SP_REGNUM) /* st.w <reg>,<offset>[sp] */ |
c906108c SS |
482 | || (fp_used |
483 | && (insn & 0x07ff) == (0x0760 | FP_RAW_REGNUM))) /* st.w <reg>,<offset>[fp] */ | |
484 | && pifsr | |
485 | && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM) | |
486 | || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM) | |
c5aa993b | 487 | || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM))) |
c906108c SS |
488 | { |
489 | pifsr->reg = reg; | |
490 | pifsr->offset = insn2 & ~1; | |
491 | pifsr->cur_frameoffset = pi->frameoffset; | |
492 | #ifdef DEBUG | |
493 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
494 | #endif | |
495 | pifsr++; | |
496 | } | |
497 | ||
c5aa993b | 498 | else if (ep_used /* sst.w <reg>,<offset>[ep] */ |
c906108c SS |
499 | && ((insn & 0x0781) == 0x0501) |
500 | && pifsr | |
501 | && (((reg = (insn >> 11) & 0x1f) >= SAVE1_START_REGNUM && reg <= SAVE1_END_REGNUM) | |
502 | || (reg >= SAVE2_START_REGNUM && reg <= SAVE2_END_REGNUM) | |
c5aa993b | 503 | || (reg >= SAVE3_START_REGNUM && reg <= SAVE3_END_REGNUM))) |
c906108c SS |
504 | { |
505 | pifsr->reg = reg; | |
506 | pifsr->offset = (insn & 0x007e) << 1; | |
507 | pifsr->cur_frameoffset = pi->frameoffset; | |
508 | #ifdef DEBUG | |
509 | printf_filtered ("\tSaved register r%d, offset %d", reg, pifsr->offset); | |
510 | #endif | |
511 | pifsr++; | |
512 | } | |
513 | ||
514 | #ifdef DEBUG | |
515 | printf_filtered ("\n"); | |
516 | #endif | |
517 | } | |
518 | ||
519 | if (pifsr) | |
520 | pifsr->framereg = 0; /* Tie off last entry */ | |
521 | ||
522 | /* Fix up any offsets to the final offset. If a frame pointer was created, use it | |
523 | instead of the stack pointer. */ | |
524 | for (pifsr_tmp = pi->pifsrs; pifsr_tmp && pifsr_tmp != pifsr; pifsr_tmp++) | |
525 | { | |
526 | pifsr_tmp->offset -= pi->frameoffset - pifsr_tmp->cur_frameoffset; | |
527 | pifsr_tmp->framereg = pi->framereg; | |
528 | ||
529 | #ifdef DEBUG | |
530 | printf_filtered ("Saved register r%d, offset = %d, framereg = r%d\n", | |
c5aa993b | 531 | pifsr_tmp->reg, pifsr_tmp->offset, pifsr_tmp->framereg); |
c906108c SS |
532 | #endif |
533 | } | |
534 | ||
535 | #ifdef DEBUG | |
536 | printf_filtered ("Framereg = r%d, frameoffset = %d\n", pi->framereg, pi->frameoffset); | |
537 | #endif | |
538 | ||
539 | return current_pc; | |
540 | } | |
541 | ||
542 | /* Function: init_extra_frame_info | |
543 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
544 | registers. Most of the work is done in scan_prologue(). | |
545 | ||
546 | Note that when we are called for the last frame (currently active frame), | |
547 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
548 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
549 | always be correct (since that is derived from v850_frame_chain ()). | |
550 | ||
551 | We can be called with the PC in the call dummy under two circumstances. | |
552 | First, during normal backtracing, second, while figuring out the frame | |
553 | pointer just prior to calling the target function (see run_stack_dummy). */ | |
554 | ||
555 | void | |
556 | v850_init_extra_frame_info (fi) | |
557 | struct frame_info *fi; | |
558 | { | |
559 | struct prologue_info pi; | |
560 | struct pifsr pifsrs[NUM_REGS + 1], *pifsr; | |
561 | ||
562 | if (fi->next) | |
563 | fi->pc = FRAME_SAVED_PC (fi->next); | |
564 | ||
565 | memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs); | |
566 | ||
567 | /* The call dummy doesn't save any registers on the stack, so we can return | |
568 | now. */ | |
569 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
c5aa993b | 570 | return; |
c906108c SS |
571 | |
572 | pi.pifsrs = pifsrs; | |
573 | ||
574 | v850_scan_prologue (fi->pc, &pi); | |
575 | ||
576 | if (!fi->next && pi.framereg == SP_REGNUM) | |
577 | fi->frame = read_register (pi.framereg) - pi.frameoffset; | |
578 | ||
579 | for (pifsr = pifsrs; pifsr->framereg; pifsr++) | |
580 | { | |
581 | fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame; | |
582 | ||
583 | if (pifsr->framereg == SP_REGNUM) | |
584 | fi->fsr.regs[pifsr->reg] += pi.frameoffset; | |
585 | } | |
586 | } | |
587 | ||
588 | /* Function: frame_chain | |
589 | Figure out the frame prior to FI. Unfortunately, this involves | |
590 | scanning the prologue of the caller, which will also be done | |
591 | shortly by v850_init_extra_frame_info. For the dummy frame, we | |
592 | just return the stack pointer that was in use at the time the | |
593 | function call was made. */ | |
594 | ||
595 | CORE_ADDR | |
596 | v850_frame_chain (fi) | |
597 | struct frame_info *fi; | |
598 | { | |
599 | struct prologue_info pi; | |
600 | CORE_ADDR callers_pc, fp; | |
601 | ||
602 | /* First, find out who called us */ | |
603 | callers_pc = FRAME_SAVED_PC (fi); | |
604 | /* If caller is a call-dummy, then our FP bears no relation to his FP! */ | |
605 | fp = v850_find_callers_reg (fi, FP_RAW_REGNUM); | |
c5aa993b JM |
606 | if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) |
607 | return fp; /* caller is call-dummy: return oldest value of FP */ | |
c906108c SS |
608 | |
609 | /* Caller is NOT a call-dummy, so everything else should just work. | |
610 | Even if THIS frame is a call-dummy! */ | |
611 | pi.pifsrs = NULL; | |
612 | ||
613 | v850_scan_prologue (callers_pc, &pi); | |
614 | ||
615 | if (pi.start_function) | |
616 | return 0; /* Don't chain beyond the start function */ | |
617 | ||
618 | if (pi.framereg == FP_RAW_REGNUM) | |
619 | return v850_find_callers_reg (fi, pi.framereg); | |
620 | ||
621 | return fi->frame - pi.frameoffset; | |
622 | } | |
623 | ||
624 | /* Function: find_callers_reg | |
625 | Find REGNUM on the stack. Otherwise, it's in an active register. | |
626 | One thing we might want to do here is to check REGNUM against the | |
627 | clobber mask, and somehow flag it as invalid if it isn't saved on | |
628 | the stack somewhere. This would provide a graceful failure mode | |
629 | when trying to get the value of caller-saves registers for an inner | |
630 | frame. */ | |
631 | ||
632 | CORE_ADDR | |
633 | v850_find_callers_reg (fi, regnum) | |
634 | struct frame_info *fi; | |
635 | int regnum; | |
636 | { | |
637 | for (; fi; fi = fi->next) | |
638 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) | |
639 | return generic_read_register_dummy (fi->pc, fi->frame, regnum); | |
640 | else if (fi->fsr.regs[regnum] != 0) | |
c5aa993b JM |
641 | return read_memory_unsigned_integer (fi->fsr.regs[regnum], |
642 | REGISTER_RAW_SIZE (regnum)); | |
c906108c SS |
643 | |
644 | return read_register (regnum); | |
645 | } | |
646 | ||
647 | /* Function: skip_prologue | |
648 | Return the address of the first code past the prologue of the function. */ | |
649 | ||
650 | CORE_ADDR | |
651 | v850_skip_prologue (pc) | |
652 | CORE_ADDR pc; | |
653 | { | |
654 | CORE_ADDR func_addr, func_end; | |
655 | ||
656 | /* See what the symbol table says */ | |
657 | ||
658 | if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) | |
659 | { | |
660 | struct symtab_and_line sal; | |
661 | ||
662 | sal = find_pc_line (func_addr, 0); | |
663 | ||
664 | if (sal.line != 0 && sal.end < func_end) | |
665 | return sal.end; | |
666 | else | |
667 | /* Either there's no line info, or the line after the prologue is after | |
668 | the end of the function. In this case, there probably isn't a | |
669 | prologue. */ | |
670 | return pc; | |
671 | } | |
672 | ||
673 | /* We can't find the start of this function, so there's nothing we can do. */ | |
674 | return pc; | |
675 | } | |
676 | ||
677 | /* Function: pop_frame | |
678 | This routine gets called when either the user uses the `return' | |
679 | command, or the call dummy breakpoint gets hit. */ | |
680 | ||
681 | void | |
682 | v850_pop_frame (frame) | |
683 | struct frame_info *frame; | |
684 | { | |
685 | int regnum; | |
686 | ||
c5aa993b | 687 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
688 | generic_pop_dummy_frame (); |
689 | else | |
690 | { | |
691 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
692 | ||
693 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
694 | if (frame->fsr.regs[regnum] != 0) | |
695 | write_register (regnum, | |
c5aa993b JM |
696 | read_memory_unsigned_integer (frame->fsr.regs[regnum], |
697 | REGISTER_RAW_SIZE (regnum))); | |
c906108c SS |
698 | |
699 | write_register (SP_REGNUM, FRAME_FP (frame)); | |
700 | } | |
701 | ||
702 | flush_cached_frames (); | |
703 | } | |
704 | ||
705 | /* Function: push_arguments | |
706 | Setup arguments and RP for a call to the target. First four args | |
707 | go in R6->R9, subsequent args go into sp + 16 -> sp + ... Structs | |
708 | are passed by reference. 64 bit quantities (doubles and long | |
709 | longs) may be split between the regs and the stack. When calling a | |
710 | function that returns a struct, a pointer to the struct is passed | |
711 | in as a secret first argument (always in R6). | |
712 | ||
713 | Stack space for the args has NOT been allocated: that job is up to us. | |
c5aa993b | 714 | */ |
c906108c SS |
715 | |
716 | CORE_ADDR | |
717 | v850_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
718 | int nargs; | |
719 | value_ptr *args; | |
720 | CORE_ADDR sp; | |
721 | unsigned char struct_return; | |
722 | CORE_ADDR struct_addr; | |
723 | { | |
724 | int argreg; | |
725 | int argnum; | |
726 | int len = 0; | |
727 | int stack_offset; | |
728 | ||
729 | /* First, just for safety, make sure stack is aligned */ | |
730 | sp &= ~3; | |
731 | ||
732 | /* Now make space on the stack for the args. */ | |
733 | for (argnum = 0; argnum < nargs; argnum++) | |
c5aa993b JM |
734 | len += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); |
735 | sp -= len; /* possibly over-allocating, but it works... */ | |
736 | /* (you might think we could allocate 16 bytes */ | |
737 | /* less, but the ABI seems to use it all! ) */ | |
c906108c SS |
738 | argreg = ARG0_REGNUM; |
739 | ||
740 | /* the struct_return pointer occupies the first parameter-passing reg */ | |
741 | if (struct_return) | |
c5aa993b | 742 | write_register (argreg++, struct_addr); |
c906108c SS |
743 | |
744 | stack_offset = 16; | |
745 | /* The offset onto the stack at which we will start copying parameters | |
746 | (after the registers are used up) begins at 16 rather than at zero. | |
747 | I don't really know why, that's just the way it seems to work. */ | |
748 | ||
749 | /* Now load as many as possible of the first arguments into | |
750 | registers, and push the rest onto the stack. There are 16 bytes | |
751 | in four registers available. Loop thru args from first to last. */ | |
752 | for (argnum = 0; argnum < nargs; argnum++) | |
753 | { | |
754 | int len; | |
755 | char *val; | |
c5aa993b | 756 | char valbuf[REGISTER_RAW_SIZE (ARG0_REGNUM)]; |
c906108c SS |
757 | |
758 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
759 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
760 | { | |
761 | store_address (valbuf, 4, VALUE_ADDRESS (*args)); | |
762 | len = 4; | |
763 | val = valbuf; | |
764 | } | |
765 | else | |
766 | { | |
767 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 768 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
769 | } |
770 | ||
771 | while (len > 0) | |
c5aa993b | 772 | if (argreg <= ARGLAST_REGNUM) |
c906108c SS |
773 | { |
774 | CORE_ADDR regval; | |
775 | ||
776 | regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); | |
777 | write_register (argreg, regval); | |
778 | ||
779 | len -= REGISTER_RAW_SIZE (argreg); | |
780 | val += REGISTER_RAW_SIZE (argreg); | |
781 | argreg++; | |
782 | } | |
783 | else | |
784 | { | |
785 | write_memory (sp + stack_offset, val, 4); | |
786 | ||
787 | len -= 4; | |
788 | val += 4; | |
789 | stack_offset += 4; | |
790 | } | |
791 | args++; | |
792 | } | |
793 | return sp; | |
794 | } | |
795 | ||
796 | /* Function: push_return_address (pc) | |
797 | Set up the return address for the inferior function call. | |
798 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 799 | |
c906108c SS |
800 | CORE_ADDR |
801 | v850_push_return_address (pc, sp) | |
802 | CORE_ADDR pc; | |
803 | CORE_ADDR sp; | |
804 | { | |
805 | write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); | |
806 | return sp; | |
807 | } | |
c5aa993b | 808 | |
c906108c SS |
809 | /* Function: frame_saved_pc |
810 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
811 | is saved in the stack anywhere, otherwise we get it from the | |
812 | registers. If the inner frame is a dummy frame, return its PC | |
813 | instead of RP, because that's where "caller" of the dummy-frame | |
814 | will be found. */ | |
815 | ||
816 | CORE_ADDR | |
817 | v850_frame_saved_pc (fi) | |
818 | struct frame_info *fi; | |
819 | { | |
c5aa993b JM |
820 | if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) |
821 | return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); | |
c906108c SS |
822 | else |
823 | return v850_find_callers_reg (fi, RP_REGNUM); | |
824 | } | |
825 | ||
c906108c SS |
826 | |
827 | /* Function: fix_call_dummy | |
828 | Pokes the callee function's address into the CALL_DUMMY assembly stub. | |
829 | Assumes that the CALL_DUMMY looks like this: | |
c5aa993b JM |
830 | jarl <offset24>, r31 |
831 | trap | |
832 | */ | |
c906108c SS |
833 | |
834 | int | |
835 | v850_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p) | |
836 | char *dummy; | |
837 | CORE_ADDR sp; | |
838 | CORE_ADDR fun; | |
839 | int nargs; | |
840 | value_ptr *args; | |
841 | struct type *type; | |
842 | int gcc_p; | |
843 | { | |
844 | long offset24; | |
845 | ||
846 | offset24 = (long) fun - (long) entry_point_address (); | |
847 | offset24 &= 0x3fffff; | |
848 | offset24 |= 0xff800000; /* jarl <offset24>, r31 */ | |
849 | ||
c5aa993b JM |
850 | store_unsigned_integer ((unsigned int *) &dummy[2], 2, offset24 & 0xffff); |
851 | store_unsigned_integer ((unsigned int *) &dummy[0], 2, offset24 >> 16); | |
c906108c SS |
852 | return 0; |
853 | } | |
854 | ||
855 | /* Change the register names based on the current machine type. */ | |
856 | ||
857 | static int | |
858 | v850_target_architecture_hook (ap) | |
859 | const bfd_arch_info_type *ap; | |
860 | { | |
861 | int i, j; | |
862 | ||
863 | if (ap->arch != bfd_arch_v850) | |
864 | return 0; | |
865 | ||
866 | for (i = 0; v850_processor_type_table[i].regnames != NULL; i++) | |
867 | { | |
868 | if (v850_processor_type_table[i].mach == ap->mach) | |
869 | { | |
870 | v850_register_names = v850_processor_type_table[i].regnames; | |
c5394b80 | 871 | tm_print_insn_info.mach = ap->mach; |
c906108c SS |
872 | return 1; |
873 | } | |
874 | } | |
875 | ||
96baa820 | 876 | internal_error ("Architecture `%s' unreconized", ap->printable_name); |
c906108c SS |
877 | } |
878 | ||
879 | void | |
880 | _initialize_v850_tdep () | |
881 | { | |
882 | tm_print_insn = print_insn_v850; | |
883 | target_architecture_hook = v850_target_architecture_hook; | |
884 | } |