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Allocate buffer with proper size in amd64_pseudo_register_{read_value,write}
[deliverable/binutils-gdb.git] / gdb / nds32-tdep.c
CommitLineData
a28d8e50
YTL		 1/* Target-dependent code for the NDS32 architecture, for GDB.
2
e2882c85 3 Copyright (C) 2013-2018 Free Software Foundation, Inc.
a28d8e50
YTL		 4 Contributed by Andes Technology Corporation.
5
6 This file is part of GDB.
7
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 3 of the License, or
11 (at your option) any later version.
12
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.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20
21#include "defs.h"
22#include "frame.h"
23#include "frame-unwind.h"
24#include "frame-base.h"
25#include "symtab.h"
26#include "gdbtypes.h"
27#include "gdbcore.h"
28#include "value.h"
29#include "reggroups.h"
30#include "inferior.h"
31#include "osabi.h"
32#include "arch-utils.h"
33#include "regcache.h"
34#include "dis-asm.h"
35#include "user-regs.h"
36#include "elf-bfd.h"
37#include "dwarf2-frame.h"
38#include "remote.h"
39#include "target-descriptions.h"
40
41#include "nds32-tdep.h"
42#include "elf/nds32.h"
43#include "opcode/nds32.h"
325fac50
PA		 44#include <algorithm>
45
a28d8e50
YTL		 46#include "features/nds32.c"
47
48/* Simple macros for instruction analysis. */
49#define CHOP_BITS(insn, n) (insn & ~__MASK (n))
50#define N32_LSMW_ENABLE4(insn) (((insn) >> 6) & 0xf)
51#define N32_SMW_ADM \
52 N32_TYPE4 (LSMW, 0, 0, 0, 1, (N32_LSMW_ADM << 2) | N32_LSMW_LSMW)
53#define N32_LMW_BIM \
54 N32_TYPE4 (LSMW, 0, 0, 0, 0, (N32_LSMW_BIM << 2) | N32_LSMW_LSMW)
55#define N32_FLDI_SP \
56 N32_TYPE2 (LDC, 0, REG_SP, 0)
57
a28d8e50
YTL		 58/* Use an invalid address value as 'not available' marker. */
59enum { REG_UNAVAIL = (CORE_ADDR) -1 };
60
61/* Use an impossible value as invalid offset. */
62enum { INVALID_OFFSET = (CORE_ADDR) -1 };
63
64/* Instruction groups for NDS32 epilogue analysis. */
65enum
66{
67 /* Instructions used everywhere, not only in epilogue. */
68 INSN_NORMAL,
69 /* Instructions used to reset sp for local vars, arguments, etc. */
70 INSN_RESET_SP,
71 /* Instructions used to recover saved regs and to recover padding. */
72 INSN_RECOVER,
73 /* Instructions used to return to the caller. */
74 INSN_RETURN,
75 /* Instructions used to recover saved regs and to return to the caller. */
76 INSN_RECOVER_RETURN,
77};
78
79static const char *const nds32_register_names[] =
80{
81 /* 32 GPRs. */
82 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
83 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
84 "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
85 "r24", "r25", "r26", "r27", "fp", "gp", "lp", "sp",
86 /* PC. */
87 "pc",
88};
89
90static const char *const nds32_fdr_register_names[] =
91{
92 "fd0", "fd1", "fd2", "fd3", "fd4", "fd5", "fd6", "fd7",
93 "fd8", "fd9", "fd10", "fd11", "fd12", "fd13", "fd14", "fd15",
94 "fd16", "fd17", "fd18", "fd19", "fd20", "fd21", "fd22", "fd23",
95 "fd24", "fd25", "fd26", "fd27", "fd28", "fd29", "fd30", "fd31"
96};
97
98static const char *const nds32_fsr_register_names[] =
99{
100 "fs0", "fs1", "fs2", "fs3", "fs4", "fs5", "fs6", "fs7",
101 "fs8", "fs9", "fs10", "fs11", "fs12", "fs13", "fs14", "fs15",
102 "fs16", "fs17", "fs18", "fs19", "fs20", "fs21", "fs22", "fs23",
103 "fs24", "fs25", "fs26", "fs27", "fs28", "fs29", "fs30", "fs31"
104};
105
106/* The number of registers for four FPU configuration options. */
107const int num_fdr_map[] = { 4, 8, 16, 32 };
108const int num_fsr_map[] = { 8, 16, 32, 32 };
109
110/* Aliases for registers. */
111static const struct
112{
113 const char *name;
114 const char *alias;
115} nds32_register_aliases[] =
116{
117 {"r15", "ta"},
118 {"r26", "p0"},
119 {"r27", "p1"},
120 {"fp", "r28"},
121 {"gp", "r29"},
122 {"lp", "r30"},
123 {"sp", "r31"},
124
125 {"cr0", "cpu_ver"},
126 {"cr1", "icm_cfg"},
127 {"cr2", "dcm_cfg"},
128 {"cr3", "mmu_cfg"},
129 {"cr4", "msc_cfg"},
130 {"cr5", "core_id"},
131 {"cr6", "fucop_exist"},
132 {"cr7", "msc_cfg2"},
133
134 {"ir0", "psw"},
135 {"ir1", "ipsw"},
136 {"ir2", "p_psw"},
137 {"ir3", "ivb"},
138 {"ir4", "eva"},
139 {"ir5", "p_eva"},
140 {"ir6", "itype"},
141 {"ir7", "p_itype"},
142 {"ir8", "merr"},
143 {"ir9", "ipc"},
144 {"ir10", "p_ipc"},
145 {"ir11", "oipc"},
146 {"ir12", "p_p0"},
147 {"ir13", "p_p1"},
148 {"ir14", "int_mask"},
149 {"ir15", "int_pend"},
150 {"ir16", "sp_usr"},
151 {"ir17", "sp_priv"},
152 {"ir18", "int_pri"},
153 {"ir19", "int_ctrl"},
154 {"ir20", "sp_usr1"},
155 {"ir21", "sp_priv1"},
156 {"ir22", "sp_usr2"},
157 {"ir23", "sp_priv2"},
158 {"ir24", "sp_usr3"},
159 {"ir25", "sp_priv3"},
160 {"ir26", "int_mask2"},
161 {"ir27", "int_pend2"},
162 {"ir28", "int_pri2"},
163 {"ir29", "int_trigger"},
164
165 {"mr0", "mmu_ctl"},
166 {"mr1", "l1_pptb"},
167 {"mr2", "tlb_vpn"},
168 {"mr3", "tlb_data"},
169 {"mr4", "tlb_misc"},
170 {"mr5", "vlpt_idx"},
171 {"mr6", "ilmb"},
172 {"mr7", "dlmb"},
173 {"mr8", "cache_ctl"},
174 {"mr9", "hsmp_saddr"},
175 {"mr10", "hsmp_eaddr"},
176 {"mr11", "bg_region"},
177
178 {"dr0", "bpc0"},
179 {"dr1", "bpc1"},
180 {"dr2", "bpc2"},
181 {"dr3", "bpc3"},
182 {"dr4", "bpc4"},
183 {"dr5", "bpc5"},
184 {"dr6", "bpc6"},
185 {"dr7", "bpc7"},
186 {"dr8", "bpa0"},
187 {"dr9", "bpa1"},
188 {"dr10", "bpa2"},
189 {"dr11", "bpa3"},
190 {"dr12", "bpa4"},
191 {"dr13", "bpa5"},
192 {"dr14", "bpa6"},
193 {"dr15", "bpa7"},
194 {"dr16", "bpam0"},
195 {"dr17", "bpam1"},
196 {"dr18", "bpam2"},
197 {"dr19", "bpam3"},
198 {"dr20", "bpam4"},
199 {"dr21", "bpam5"},
200 {"dr22", "bpam6"},
201 {"dr23", "bpam7"},
202 {"dr24", "bpv0"},
203 {"dr25", "bpv1"},
204 {"dr26", "bpv2"},
205 {"dr27", "bpv3"},
206 {"dr28", "bpv4"},
207 {"dr29", "bpv5"},
208 {"dr30", "bpv6"},
209 {"dr31", "bpv7"},
210 {"dr32", "bpcid0"},
211 {"dr33", "bpcid1"},
212 {"dr34", "bpcid2"},
213 {"dr35", "bpcid3"},
214 {"dr36", "bpcid4"},
215 {"dr37", "bpcid5"},
216 {"dr38", "bpcid6"},
217 {"dr39", "bpcid7"},
218 {"dr40", "edm_cfg"},
219 {"dr41", "edmsw"},
220 {"dr42", "edm_ctl"},
221 {"dr43", "edm_dtr"},
222 {"dr44", "bpmtc"},
223 {"dr45", "dimbr"},
224 {"dr46", "tecr0"},
225 {"dr47", "tecr1"},
226
227 {"hspr0", "hsp_ctl"},
228 {"hspr1", "sp_bound"},
229 {"hspr2", "sp_bound_priv"},
230
231 {"pfr0", "pfmc0"},
232 {"pfr1", "pfmc1"},
233 {"pfr2", "pfmc2"},
234 {"pfr3", "pfm_ctl"},
235 {"pfr4", "pft_ctl"},
236
237 {"dmar0", "dma_cfg"},
238 {"dmar1", "dma_gcsw"},
239 {"dmar2", "dma_chnsel"},
240 {"dmar3", "dma_act"},
241 {"dmar4", "dma_setup"},
242 {"dmar5", "dma_isaddr"},
243 {"dmar6", "dma_esaddr"},
244 {"dmar7", "dma_tcnt"},
245 {"dmar8", "dma_status"},
246 {"dmar9", "dma_2dset"},
247 {"dmar10", "dma_2dsctl"},
248 {"dmar11", "dma_rcnt"},
249 {"dmar12", "dma_hstatus"},
250
251 {"racr0", "prusr_acc_ctl"},
252 {"fucpr", "fucop_ctl"},
253
254 {"idr0", "sdz_ctl"},
255 {"idr1", "misc_ctl"},
256 {"idr2", "ecc_misc"},
257
258 {"secur0", "sfcr"},
259 {"secur1", "sign"},
260 {"secur2", "isign"},
261 {"secur3", "p_isign"},
262};
263
264/* Value of a register alias. BATON is the regnum of the corresponding
265 register. */
266
267static struct value *
268value_of_nds32_reg (struct frame_info *frame, const void *baton)
269{
270 return value_of_register ((int) (intptr_t) baton, frame);
271}
272\f
273/* Implement the "frame_align" gdbarch method. */
274
275static CORE_ADDR
276nds32_frame_align (struct gdbarch *gdbarch, CORE_ADDR sp)
277{
278 /* 8-byte aligned. */
279 return align_down (sp, 8);
280}
281
598cc9dc 282/* The same insn machine code is used for little-endian and big-endian. */
04180708 283constexpr gdb_byte nds32_break_insn[] = { 0xEA, 0x00 };
a28d8e50 284
04180708 285typedef BP_MANIPULATION (nds32_break_insn) nds32_breakpoint;
a28d8e50
YTL		 286
287/* Implement the "dwarf2_reg_to_regnum" gdbarch method. */
288
289static int
290nds32_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int num)
291{
292 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
293 const int FSR = 38;
294 const int FDR = FSR + 32;
295
296 if (num >= 0 && num < 32)
297 {
298 /* General-purpose registers (R0 - R31). */
299 return num;
300 }
301 else if (num >= FSR && num < FSR + 32)
302 {
303 /* Single precision floating-point registers (FS0 - FS31). */
304 return num - FSR + tdep->fs0_regnum;
305 }
306 else if (num >= FDR && num < FDR + 32)
307 {
308 /* Double precision floating-point registers (FD0 - FD31). */
309 return num - FDR + NDS32_FD0_REGNUM;
310 }
311
312 /* No match, return a inaccessible register number. */
313 return -1;
314}
315\f
316/* NDS32 register groups. */
317static struct reggroup *nds32_cr_reggroup;
318static struct reggroup *nds32_ir_reggroup;
319static struct reggroup *nds32_mr_reggroup;
320static struct reggroup *nds32_dr_reggroup;
321static struct reggroup *nds32_pfr_reggroup;
322static struct reggroup *nds32_hspr_reggroup;
323static struct reggroup *nds32_dmar_reggroup;
324static struct reggroup *nds32_racr_reggroup;
325static struct reggroup *nds32_idr_reggroup;
326static struct reggroup *nds32_secur_reggroup;
327
328static void
329nds32_init_reggroups (void)
330{
331 nds32_cr_reggroup = reggroup_new ("cr", USER_REGGROUP);
332 nds32_ir_reggroup = reggroup_new ("ir", USER_REGGROUP);
333 nds32_mr_reggroup = reggroup_new ("mr", USER_REGGROUP);
334 nds32_dr_reggroup = reggroup_new ("dr", USER_REGGROUP);
335 nds32_pfr_reggroup = reggroup_new ("pfr", USER_REGGROUP);
336 nds32_hspr_reggroup = reggroup_new ("hspr", USER_REGGROUP);
337 nds32_dmar_reggroup = reggroup_new ("dmar", USER_REGGROUP);
338 nds32_racr_reggroup = reggroup_new ("racr", USER_REGGROUP);
339 nds32_idr_reggroup = reggroup_new ("idr", USER_REGGROUP);
340 nds32_secur_reggroup = reggroup_new ("secur", USER_REGGROUP);
341}
342
343static void
344nds32_add_reggroups (struct gdbarch *gdbarch)
345{
346 /* Add pre-defined register groups. */
347 reggroup_add (gdbarch, general_reggroup);
348 reggroup_add (gdbarch, float_reggroup);
349 reggroup_add (gdbarch, system_reggroup);
350 reggroup_add (gdbarch, all_reggroup);
351 reggroup_add (gdbarch, save_reggroup);
352 reggroup_add (gdbarch, restore_reggroup);
353
354 /* Add NDS32 register groups. */
355 reggroup_add (gdbarch, nds32_cr_reggroup);
356 reggroup_add (gdbarch, nds32_ir_reggroup);
357 reggroup_add (gdbarch, nds32_mr_reggroup);
358 reggroup_add (gdbarch, nds32_dr_reggroup);
359 reggroup_add (gdbarch, nds32_pfr_reggroup);
360 reggroup_add (gdbarch, nds32_hspr_reggroup);
361 reggroup_add (gdbarch, nds32_dmar_reggroup);
362 reggroup_add (gdbarch, nds32_racr_reggroup);
363 reggroup_add (gdbarch, nds32_idr_reggroup);
364 reggroup_add (gdbarch, nds32_secur_reggroup);
365}
366
367/* Implement the "register_reggroup_p" gdbarch method. */
368
369static int
370nds32_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
371 struct reggroup *reggroup)
372{
373 const char *reg_name;
374 const char *group_name;
375 int ret;
376
377 if (reggroup == all_reggroup)
378 return 1;
379
380 /* General reggroup contains only GPRs and PC. */
381 if (reggroup == general_reggroup)
382 return regnum <= NDS32_PC_REGNUM;
383
384 if (reggroup == float_reggroup || reggroup == save_reggroup
385 || reggroup == restore_reggroup)
386 {
387 ret = tdesc_register_in_reggroup_p (gdbarch, regnum, reggroup);
388 if (ret != -1)
389 return ret;
390
391 return default_register_reggroup_p (gdbarch, regnum, reggroup);
392 }
393
394 if (reggroup == system_reggroup)
395 return (regnum > NDS32_PC_REGNUM)
396 && !nds32_register_reggroup_p (gdbarch, regnum, float_reggroup);
397
398 /* The NDS32 reggroup contains registers whose name is prefixed
399 by reggroup name. */
400 reg_name = gdbarch_register_name (gdbarch, regnum);
401 group_name = reggroup_name (reggroup);
402 return !strncmp (reg_name, group_name, strlen (group_name));
403}
404\f
405/* Implement the "pseudo_register_type" tdesc_arch_data method. */
406
407static struct type *
408nds32_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
409{
410 regnum -= gdbarch_num_regs (gdbarch);
411
412 /* Currently, only FSRs could be defined as pseudo registers. */
413 if (regnum < gdbarch_num_pseudo_regs (gdbarch))
414 return arch_float_type (gdbarch, -1, "builtin_type_ieee_single",
415 floatformats_ieee_single);
416
417 warning (_("Unknown nds32 pseudo register %d."), regnum);
418 return NULL;
419}
420
421/* Implement the "pseudo_register_name" tdesc_arch_data method. */
422
423static const char *
424nds32_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
425{
426 regnum -= gdbarch_num_regs (gdbarch);
427
428 /* Currently, only FSRs could be defined as pseudo registers. */
429 if (regnum < gdbarch_num_pseudo_regs (gdbarch))
430 return nds32_fsr_register_names[regnum];
431
432 warning (_("Unknown nds32 pseudo register %d."), regnum);
433 return NULL;
434}
435
436/* Implement the "pseudo_register_read" gdbarch method. */
437
438static enum register_status
439nds32_pseudo_register_read (struct gdbarch *gdbarch,
849d0ba8 440 readable_regcache *regcache, int regnum,
a28d8e50
YTL		 441 gdb_byte *buf)
442{
443 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
444 gdb_byte reg_buf[8];
445 int offset, fdr_regnum;
19c45594 446 enum register_status status;
a28d8e50 447
19c45594
AH		 448 /* This function is registered in nds32_gdbarch_init only after these are
449 set. */
450 gdb_assert (tdep->fpu_freg != -1);
451 gdb_assert (tdep->use_pseudo_fsrs != 0);
a28d8e50
YTL		 452
453 regnum -= gdbarch_num_regs (gdbarch);
454
455 /* Currently, only FSRs could be defined as pseudo registers. */
456 if (regnum < gdbarch_num_pseudo_regs (gdbarch))
457 {
458 /* fs0 is always the most significant half of fd0. */
459 if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
460 offset = (regnum & 1) ? 4 : 0;
461 else
462 offset = (regnum & 1) ? 0 : 4;
463
464 fdr_regnum = NDS32_FD0_REGNUM + (regnum >> 1);
03f50fc8 465 status = regcache->raw_read (fdr_regnum, reg_buf);
a28d8e50
YTL		 466 if (status == REG_VALID)
467 memcpy (buf, reg_buf + offset, 4);
19c45594
AH		 468
469 return status;
a28d8e50
YTL		 470 }
471
19c45594 472 gdb_assert_not_reached ("invalid pseudo register number");
a28d8e50
YTL		 473}
474
475/* Implement the "pseudo_register_write" gdbarch method. */
476
477static void
478nds32_pseudo_register_write (struct gdbarch *gdbarch,
479 struct regcache *regcache, int regnum,
480 const gdb_byte *buf)
481{
482 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
483 gdb_byte reg_buf[8];
484 int offset, fdr_regnum;
485
19c45594
AH		 486 /* This function is registered in nds32_gdbarch_init only after these are
487 set. */
488 gdb_assert (tdep->fpu_freg != -1);
489 gdb_assert (tdep->use_pseudo_fsrs != 0);
a28d8e50
YTL		 490
491 regnum -= gdbarch_num_regs (gdbarch);
492
493 /* Currently, only FSRs could be defined as pseudo registers. */
494 if (regnum < gdbarch_num_pseudo_regs (gdbarch))
495 {
496 /* fs0 is always the most significant half of fd0. */
497 if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG)
498 offset = (regnum & 1) ? 4 : 0;
499 else
500 offset = (regnum & 1) ? 0 : 4;
501
502 fdr_regnum = NDS32_FD0_REGNUM + (regnum >> 1);
0b883586 503 regcache->raw_read (fdr_regnum, reg_buf);
a28d8e50 504 memcpy (reg_buf + offset, buf, 4);
10eaee5f 505 regcache->raw_write (fdr_regnum, reg_buf);
19c45594 506 return;
a28d8e50 507 }
19c45594
AH		 508
509 gdb_assert_not_reached ("invalid pseudo register number");
a28d8e50
YTL		 510}
511\f
512/* Helper function for NDS32 ABI. Return true if FPRs can be used
513 to pass function arguments and return value. */
514
515static int
516nds32_abi_use_fpr (int elf_abi)
517{
518 return elf_abi == E_NDS_ABI_V2FP_PLUS;
519}
520
521/* Helper function for NDS32 ABI. Return true if GPRs and stack
522 can be used together to pass an argument. */
523
524static int
525nds32_abi_split (int elf_abi)
526{
527 return elf_abi == E_NDS_ABI_AABI;
528}
529
530#define NDS32_NUM_SAVED_REGS (NDS32_LP_REGNUM + 1)
531
532struct nds32_frame_cache
533{
534 /* The previous frame's inner most stack address. Used as this
535 frame ID's stack_addr. */
536 CORE_ADDR prev_sp;
537
538 /* The frame's base, optionally used by the high-level debug info. */
539 CORE_ADDR base;
540
541 /* During prologue analysis, keep how far the SP and FP have been offset
542 from the start of the stack frame (as defined by the previous frame's
543 stack pointer).
544 During epilogue analysis, keep how far the SP has been offset from the
545 current stack pointer. */
546 CORE_ADDR sp_offset;
547 CORE_ADDR fp_offset;
548
549 /* The address of the first instruction in this function. */
550 CORE_ADDR pc;
551
552 /* Saved registers. */
553 CORE_ADDR saved_regs[NDS32_NUM_SAVED_REGS];
554};
555
556/* Allocate and initialize a frame cache. */
557
558static struct nds32_frame_cache *
559nds32_alloc_frame_cache (void)
560{
561 struct nds32_frame_cache *cache;
562 int i;
563
564 cache = FRAME_OBSTACK_ZALLOC (struct nds32_frame_cache);
565
566 /* Initialize fp_offset to check if FP is set in prologue. */
567 cache->fp_offset = INVALID_OFFSET;
568
569 /* Saved registers. We initialize these to -1 since zero is a valid
570 offset. */
571 for (i = 0; i < NDS32_NUM_SAVED_REGS; i++)
572 cache->saved_regs[i] = REG_UNAVAIL;
573
574 return cache;
575}
576
577/* Helper function for instructions used to push multiple words. */
578
579static void
580nds32_push_multiple_words (struct nds32_frame_cache *cache, int rb, int re,
581 int enable4)
582{
583 CORE_ADDR sp_offset = cache->sp_offset;
584 int i;
585
586 /* Check LP, GP, FP in enable4. */
587 for (i = 1; i <= 3; i++)
588 {
589 if ((enable4 >> i) & 0x1)
590 {
591 sp_offset += 4;
592 cache->saved_regs[NDS32_SP_REGNUM - i] = sp_offset;
593 }
594 }
595
596 /* Skip case where re == rb == sp. */
597 if ((rb < REG_FP) && (re < REG_FP))
598 {
599 for (i = re; i >= rb; i--)
600 {
601 sp_offset += 4;
602 cache->saved_regs[i] = sp_offset;
603 }
604 }
605
606 /* For sp, update the offset. */
607 cache->sp_offset = sp_offset;
608}
609
610/* Analyze the instructions within the given address range. If CACHE
611 is non-NULL, fill it in. Return the first address beyond the given
612 address range. If CACHE is NULL, return the first address not
613 recognized as a prologue instruction. */
614
615static CORE_ADDR
616nds32_analyze_prologue (struct gdbarch *gdbarch, CORE_ADDR pc,
617 CORE_ADDR limit_pc, struct nds32_frame_cache *cache)
618{
619 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
620 int abi_use_fpr = nds32_abi_use_fpr (tdep->elf_abi);
621 /* Current scanning status. */
622 int in_prologue_bb = 0;
623 int val_ta = 0;
624 uint32_t insn, insn_len;
625
626 for (; pc < limit_pc; pc += insn_len)
627 {
628 insn = read_memory_unsigned_integer (pc, 4, BFD_ENDIAN_BIG);
629
630 if ((insn & 0x80000000) == 0)
631 {
632 /* 32-bit instruction */
633 insn_len = 4;
634
635 if (CHOP_BITS (insn, 15) == N32_TYPE2 (ADDI, REG_SP, REG_SP, 0))
636 {
637 /* addi $sp, $sp, imm15s */
638 int imm15s = N32_IMM15S (insn);
639
640 if (imm15s < 0)
641 {
642 if (cache != NULL)
643 cache->sp_offset += -imm15s;
644
645 in_prologue_bb = 1;
646 continue;
647 }
648 }
649 else if (CHOP_BITS (insn, 15) == N32_TYPE2 (ADDI, REG_FP, REG_SP, 0))
650 {
651 /* addi $fp, $sp, imm15s */
652 int imm15s = N32_IMM15S (insn);
653
654 if (imm15s > 0)
655 {
656 if (cache != NULL)
657 cache->fp_offset = cache->sp_offset - imm15s;
658
659 in_prologue_bb = 1;
660 continue;
661 }
662 }
663 else if ((insn & ~(__MASK (19) << 6)) == N32_SMW_ADM
664 && N32_RA5 (insn) == REG_SP)
665 {
666 /* smw.adm Rb, [$sp], Re, enable4 */
667 if (cache != NULL)
668 nds32_push_multiple_words (cache, N32_RT5 (insn),
669 N32_RB5 (insn),
670 N32_LSMW_ENABLE4 (insn));
671 in_prologue_bb = 1;
672 continue;
673 }
674 else if (insn == N32_ALU1 (ADD, REG_SP, REG_SP, REG_TA)
675 || insn == N32_ALU1 (ADD, REG_SP, REG_TA, REG_SP))
676 {
677 /* add $sp, $sp, $ta */
678 /* add $sp, $ta, $sp */
679 if (val_ta < 0)
680 {
681 if (cache != NULL)
682 cache->sp_offset += -val_ta;
683
684 in_prologue_bb = 1;
685 continue;
686 }
687 }
688 else if (CHOP_BITS (insn, 20) == N32_TYPE1 (MOVI, REG_TA, 0))
689 {
690 /* movi $ta, imm20s */
691 if (cache != NULL)
692 val_ta = N32_IMM20S (insn);
693
694 continue;
695 }
696 else if (CHOP_BITS (insn, 20) == N32_TYPE1 (SETHI, REG_TA, 0))
697 {
698 /* sethi $ta, imm20u */
699 if (cache != NULL)
700 val_ta = N32_IMM20U (insn) << 12;
701
702 continue;
703 }
704 else if (CHOP_BITS (insn, 15) == N32_TYPE2 (ORI, REG_TA, REG_TA, 0))
705 {
706 /* ori $ta, $ta, imm15u */
707 if (cache != NULL)
708 val_ta |= N32_IMM15U (insn);
709
710 continue;
711 }
712 else if (CHOP_BITS (insn, 15) == N32_TYPE2 (ADDI, REG_TA, REG_TA, 0))
713 {
714 /* addi $ta, $ta, imm15s */
715 if (cache != NULL)
716 val_ta += N32_IMM15S (insn);
717
718 continue;
719 }
720 if (insn == N32_ALU1 (ADD, REG_GP, REG_TA, REG_GP)
721 || insn == N32_ALU1 (ADD, REG_GP, REG_GP, REG_TA))
722 {
723 /* add $gp, $ta, $gp */
724 /* add $gp, $gp, $ta */
725 in_prologue_bb = 1;
726 continue;
727 }
728 else if (CHOP_BITS (insn, 20) == N32_TYPE1 (MOVI, REG_GP, 0))
729 {
730 /* movi $gp, imm20s */
731 in_prologue_bb = 1;
732 continue;
733 }
734 else if (CHOP_BITS (insn, 20) == N32_TYPE1 (SETHI, REG_GP, 0))
735 {
736 /* sethi $gp, imm20u */
737 in_prologue_bb = 1;
738 continue;
739 }
740 else if (CHOP_BITS (insn, 15) == N32_TYPE2 (ORI, REG_GP, REG_GP, 0))
741 {
742 /* ori $gp, $gp, imm15u */
743 in_prologue_bb = 1;
744 continue;
745 }
746 else
747 {
748 /* Jump/Branch insns never appear in prologue basic block.
749 The loop can be escaped early when these insns are met. */
750 if (in_prologue_bb == 1)
751 {
752 int op = N32_OP6 (insn);
753
754 if (op == N32_OP6_JI
755 || op == N32_OP6_JREG
756 || op == N32_OP6_BR1
757 || op == N32_OP6_BR2
758 || op == N32_OP6_BR3)
759 break;
760 }
761 }
762
763 if (abi_use_fpr && N32_OP6 (insn) == N32_OP6_SDC
764 && __GF (insn, 12, 3) == 0)
765 {
766 /* For FPU insns, CP (bit [13:14]) should be CP0, and only
767 normal form (bit [12] == 0) is used. */
768
769 /* fsdi FDt, [$sp + (imm12s << 2)] */
770 if (N32_RA5 (insn) == REG_SP)
771 continue;
772 }
773
774 /* The optimizer might shove anything into the prologue, if
775 we build up cache (cache != NULL) from analyzing prologue,
776 we just skip what we don't recognize and analyze further to
777 make cache as complete as possible. However, if we skip
778 prologue, we'll stop immediately on unrecognized
779 instruction. */
780 if (cache == NULL)
781 break;
782 }
783 else
784 {
785 /* 16-bit instruction */
786 insn_len = 2;
787
788 insn >>= 16;
789
790 if (CHOP_BITS (insn, 10) == N16_TYPE10 (ADDI10S, 0))
791 {
792 /* addi10s.sp */
793 int imm10s = N16_IMM10S (insn);
794
795 if (imm10s < 0)
796 {
797 if (cache != NULL)
798 cache->sp_offset += -imm10s;
799
800 in_prologue_bb = 1;
801 continue;
802 }
803 }
804 else if (__GF (insn, 7, 8) == N16_T25_PUSH25)
805 {
806 /* push25 */
807 if (cache != NULL)
808 {
809 int imm8u = (insn & 0x1f) << 3;
810 int re = (insn >> 5) & 0x3;
811 const int reg_map[] = { 6, 8, 10, 14 };
812
813 /* Operation 1 -- smw.adm R6, [$sp], Re, #0xe */
814 nds32_push_multiple_words (cache, 6, reg_map[re], 0xe);
815
816 /* Operation 2 -- sp = sp - (imm5u << 3) */
817 cache->sp_offset += imm8u;
818 }
819
820 in_prologue_bb = 1;
821 continue;
822 }
823 else if (insn == N16_TYPE5 (ADD5PC, REG_GP))
824 {
825 /* add5.pc $gp */
826 in_prologue_bb = 1;
827 continue;
828 }
829 else if (CHOP_BITS (insn, 5) == N16_TYPE55 (MOVI55, REG_GP, 0))
830 {
831 /* movi55 $gp, imm5s */
832 in_prologue_bb = 1;
833 continue;
834 }
835 else
836 {
837 /* Jump/Branch insns never appear in prologue basic block.
838 The loop can be escaped early when these insns are met. */
839 if (in_prologue_bb == 1)
840 {
841 uint32_t insn5 = CHOP_BITS (insn, 5);
842 uint32_t insn8 = CHOP_BITS (insn, 8);
843 uint32_t insn38 = CHOP_BITS (insn, 11);
844
845 if (insn5 == N16_TYPE5 (JR5, 0)
846 || insn5 == N16_TYPE5 (JRAL5, 0)
847 || insn5 == N16_TYPE5 (RET5, 0)
848 || insn8 == N16_TYPE8 (J8, 0)
849 || insn8 == N16_TYPE8 (BEQZS8, 0)
850 || insn8 == N16_TYPE8 (BNEZS8, 0)
851 || insn38 == N16_TYPE38 (BEQZ38, 0, 0)
852 || insn38 == N16_TYPE38 (BNEZ38, 0, 0)
853 || insn38 == N16_TYPE38 (BEQS38, 0, 0)
854 || insn38 == N16_TYPE38 (BNES38, 0, 0))
855 break;
856 }
857 }
858
859 /* The optimizer might shove anything into the prologue, if
860 we build up cache (cache != NULL) from analyzing prologue,
861 we just skip what we don't recognize and analyze further to
862 make cache as complete as possible. However, if we skip
863 prologue, we'll stop immediately on unrecognized
864 instruction. */
865 if (cache == NULL)
866 break;
867 }
868 }
869
870 return pc;
871}
872
873/* Implement the "skip_prologue" gdbarch method.
874
875 Find the end of function prologue. */
876
877static CORE_ADDR
878nds32_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
879{
880 CORE_ADDR func_addr, limit_pc;
881
882 /* See if we can determine the end of the prologue via the symbol table.
883 If so, then return either PC, or the PC after the prologue, whichever
884 is greater. */
885 if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
886 {
887 CORE_ADDR post_prologue_pc
888 = skip_prologue_using_sal (gdbarch, func_addr);
889 if (post_prologue_pc != 0)
325fac50 890 return std::max (pc, post_prologue_pc);
a28d8e50
YTL		 891 }
892
893 /* Can't determine prologue from the symbol table, need to examine
894 instructions. */
895
896 /* Find an upper limit on the function prologue using the debug
897 information. If the debug information could not be used to provide
898 that bound, then use an arbitrary large number as the upper bound. */
899 limit_pc = skip_prologue_using_sal (gdbarch, pc);
900 if (limit_pc == 0)
901 limit_pc = pc + 128; /* Magic. */
902
903 /* Find the end of prologue. */
904 return nds32_analyze_prologue (gdbarch, pc, limit_pc, NULL);
905}
906
907/* Allocate and fill in *THIS_CACHE with information about the prologue of
908 *THIS_FRAME. Do not do this if *THIS_CACHE was already allocated. Return
909 a pointer to the current nds32_frame_cache in *THIS_CACHE. */
910
911static struct nds32_frame_cache *
912nds32_frame_cache (struct frame_info *this_frame, void **this_cache)
913{
914 struct gdbarch *gdbarch = get_frame_arch (this_frame);
915 struct nds32_frame_cache *cache;
916 CORE_ADDR current_pc;
917 ULONGEST prev_sp;
918 ULONGEST this_base;
919 int i;
920
921 if (*this_cache)
922 return (struct nds32_frame_cache *) *this_cache;
923
924 cache = nds32_alloc_frame_cache ();
925 *this_cache = cache;
926
927 cache->pc = get_frame_func (this_frame);
928 current_pc = get_frame_pc (this_frame);
929 nds32_analyze_prologue (gdbarch, cache->pc, current_pc, cache);
930
931 /* Compute the previous frame's stack pointer (which is also the
932 frame's ID's stack address), and this frame's base pointer. */
933 if (cache->fp_offset != INVALID_OFFSET)
934 {
935 /* FP is set in prologue, so it can be used to calculate other info. */
936 this_base = get_frame_register_unsigned (this_frame, NDS32_FP_REGNUM);
937 prev_sp = this_base + cache->fp_offset;
938 }
939 else
940 {
941 this_base = get_frame_register_unsigned (this_frame, NDS32_SP_REGNUM);
942 prev_sp = this_base + cache->sp_offset;
943 }
944
945 cache->prev_sp = prev_sp;
946 cache->base = this_base;
947
948 /* Adjust all the saved registers such that they contain addresses
949 instead of offsets. */
950 for (i = 0; i < NDS32_NUM_SAVED_REGS; i++)
951 if (cache->saved_regs[i] != REG_UNAVAIL)
952 cache->saved_regs[i] = cache->prev_sp - cache->saved_regs[i];
953
954 return cache;
955}
956
957/* Implement the "this_id" frame_unwind method.
958
959 Our frame ID for a normal frame is the current function's starting
960 PC and the caller's SP when we were called. */
961
962static void
963nds32_frame_this_id (struct frame_info *this_frame,
964 void **this_cache, struct frame_id *this_id)
965{
966 struct nds32_frame_cache *cache = nds32_frame_cache (this_frame, this_cache);
967
968 /* This marks the outermost frame. */
969 if (cache->prev_sp == 0)
970 return;
971
972 *this_id = frame_id_build (cache->prev_sp, cache->pc);
973}
974
975/* Implement the "prev_register" frame_unwind method. */
976
977static struct value *
978nds32_frame_prev_register (struct frame_info *this_frame, void **this_cache,
979 int regnum)
980{
981 struct nds32_frame_cache *cache = nds32_frame_cache (this_frame, this_cache);
982
983 if (regnum == NDS32_SP_REGNUM)
984 return frame_unwind_got_constant (this_frame, regnum, cache->prev_sp);
985
986 /* The PC of the previous frame is stored in the LP register of
987 the current frame. */
988 if (regnum == NDS32_PC_REGNUM)
989 regnum = NDS32_LP_REGNUM;
990
991 if (regnum < NDS32_NUM_SAVED_REGS && cache->saved_regs[regnum] != REG_UNAVAIL)
992 return frame_unwind_got_memory (this_frame, regnum,
993 cache->saved_regs[regnum]);
994
995 return frame_unwind_got_register (this_frame, regnum, regnum);
996}
997
998static const struct frame_unwind nds32_frame_unwind =
999{
1000 NORMAL_FRAME,
1001 default_frame_unwind_stop_reason,
1002 nds32_frame_this_id,
1003 nds32_frame_prev_register,
1004 NULL,
1005 default_frame_sniffer,
1006};
1007
1008/* Return the frame base address of *THIS_FRAME. */
1009
1010static CORE_ADDR
1011nds32_frame_base_address (struct frame_info *this_frame, void **this_cache)
1012{
1013 struct nds32_frame_cache *cache = nds32_frame_cache (this_frame, this_cache);
1014
1015 return cache->base;
1016}
1017
1018static const struct frame_base nds32_frame_base =
1019{
1020 &nds32_frame_unwind,
1021 nds32_frame_base_address,
1022 nds32_frame_base_address,
1023 nds32_frame_base_address
1024};
1025\f
1026/* Helper function for instructions used to pop multiple words. */
1027
1028static void
1029nds32_pop_multiple_words (struct nds32_frame_cache *cache, int rb, int re,
1030 int enable4)
1031{
1032 CORE_ADDR sp_offset = cache->sp_offset;
1033 int i;
1034
1035 /* Skip case where re == rb == sp. */
1036 if ((rb < REG_FP) && (re < REG_FP))
1037 {
1038 for (i = rb; i <= re; i++)
1039 {
1040 cache->saved_regs[i] = sp_offset;
1041 sp_offset += 4;
1042 }
1043 }
1044
1045 /* Check FP, GP, LP in enable4. */
1046 for (i = 3; i >= 1; i--)
1047 {
1048 if ((enable4 >> i) & 0x1)
1049 {
1050 cache->saved_regs[NDS32_SP_REGNUM - i] = sp_offset;
1051 sp_offset += 4;
1052 }
1053 }
1054
1055 /* For sp, update the offset. */
1056 cache->sp_offset = sp_offset;
1057}
1058
1059/* The instruction sequences in NDS32 epilogue are
1060
1061 INSN_RESET_SP (optional)
1062 (If exists, this must be the first instruction in epilogue
1063 and the stack has not been destroyed.).
1064 INSN_RECOVER (optional).
1065 INSN_RETURN/INSN_RECOVER_RETURN (required). */
1066
1067/* Helper function for analyzing the given 32-bit INSN. If CACHE is non-NULL,
1068 the necessary information will be recorded. */
1069
1070static inline int
1071nds32_analyze_epilogue_insn32 (int abi_use_fpr, uint32_t insn,
1072 struct nds32_frame_cache *cache)
1073{
1074 if (CHOP_BITS (insn, 15) == N32_TYPE2 (ADDI, REG_SP, REG_SP, 0)
1075 && N32_IMM15S (insn) > 0)
1076 /* addi $sp, $sp, imm15s */
1077 return INSN_RESET_SP;
1078 else if (CHOP_BITS (insn, 15) == N32_TYPE2 (ADDI, REG_SP, REG_FP, 0)
1079 && N32_IMM15S (insn) < 0)
1080 /* addi $sp, $fp, imm15s */
1081 return INSN_RESET_SP;
1082 else if ((insn & ~(__MASK (19) << 6)) == N32_LMW_BIM
1083 && N32_RA5 (insn) == REG_SP)
1084 {
1085 /* lmw.bim Rb, [$sp], Re, enable4 */
1086 if (cache != NULL)
1087 nds32_pop_multiple_words (cache, N32_RT5 (insn),
1088 N32_RB5 (insn), N32_LSMW_ENABLE4 (insn));
1089
1090 return INSN_RECOVER;
1091 }
1092 else if (insn == N32_JREG (JR, 0, REG_LP, 0, 1))
1093 /* ret $lp */
1094 return INSN_RETURN;
1095 else if (insn == N32_ALU1 (ADD, REG_SP, REG_SP, REG_TA)
1096 || insn == N32_ALU1 (ADD, REG_SP, REG_TA, REG_SP))
1097 /* add $sp, $sp, $ta */
1098 /* add $sp, $ta, $sp */
1099 return INSN_RESET_SP;
1100 else if (abi_use_fpr
1101 && (insn & ~(__MASK (5) << 20 | __MASK (13))) == N32_FLDI_SP)
1102 {
1103 if (__GF (insn, 12, 1) == 0)
1104 /* fldi FDt, [$sp + (imm12s << 2)] */
1105 return INSN_RECOVER;
1106 else
1107 {
1108 /* fldi.bi FDt, [$sp], (imm12s << 2) */
1109 int offset = N32_IMM12S (insn) << 2;
1110
1111 if (offset == 8 || offset == 12)
1112 {
1113 if (cache != NULL)
1114 cache->sp_offset += offset;
1115
1116 return INSN_RECOVER;
1117 }
1118 }
1119 }
1120
1121 return INSN_NORMAL;
1122}
1123
1124/* Helper function for analyzing the given 16-bit INSN. If CACHE is non-NULL,
1125 the necessary information will be recorded. */
1126
1127static inline int
1128nds32_analyze_epilogue_insn16 (uint32_t insn, struct nds32_frame_cache *cache)
1129{
1130 if (insn == N16_TYPE5 (RET5, REG_LP))
1131 /* ret5 $lp */
1132 return INSN_RETURN;
1133 else if (CHOP_BITS (insn, 10) == N16_TYPE10 (ADDI10S, 0))
1134 {
1135 /* addi10s.sp */
1136 int imm10s = N16_IMM10S (insn);
1137
1138 if (imm10s > 0)
1139 {
1140 if (cache != NULL)
1141 cache->sp_offset += imm10s;
1142
1143 return INSN_RECOVER;
1144 }
1145 }
1146 else if (__GF (insn, 7, 8) == N16_T25_POP25)
1147 {
1148 /* pop25 */
1149 if (cache != NULL)
1150 {
1151 int imm8u = (insn & 0x1f) << 3;
1152 int re = (insn >> 5) & 0x3;
1153 const int reg_map[] = { 6, 8, 10, 14 };
1154
1155 /* Operation 1 -- sp = sp + (imm5u << 3) */
1156 cache->sp_offset += imm8u;
1157
1158 /* Operation 2 -- lmw.bim R6, [$sp], Re, #0xe */
1159 nds32_pop_multiple_words (cache, 6, reg_map[re], 0xe);
1160 }
1161
1162 /* Operation 3 -- ret $lp */
1163 return INSN_RECOVER_RETURN;
1164 }
1165
1166 return INSN_NORMAL;
1167}
1168
1169/* Analyze a reasonable amount of instructions from the given PC to find
1170 the instruction used to return to the caller. Return 1 if the 'return'
1171 instruction could be found, 0 otherwise.
1172
1173 If CACHE is non-NULL, fill it in. */
1174
1175static int
1176nds32_analyze_epilogue (struct gdbarch *gdbarch, CORE_ADDR pc,
1177 struct nds32_frame_cache *cache)
1178{
1179 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1180 int abi_use_fpr = nds32_abi_use_fpr (tdep->elf_abi);
1181 CORE_ADDR limit_pc;
1182 uint32_t insn, insn_len;
1183 int insn_type = INSN_NORMAL;
1184
1185 if (abi_use_fpr)
1186 limit_pc = pc + 48;
1187 else
1188 limit_pc = pc + 16;
1189
1190 for (; pc < limit_pc; pc += insn_len)
1191 {
1192 insn = read_memory_unsigned_integer (pc, 4, BFD_ENDIAN_BIG);
1193
1194 if ((insn & 0x80000000) == 0)
1195 {
1196 /* 32-bit instruction */
1197 insn_len = 4;
1198
1199 insn_type = nds32_analyze_epilogue_insn32 (abi_use_fpr, insn, cache);
1200 if (insn_type == INSN_RETURN)
1201 return 1;
1202 else if (insn_type == INSN_RECOVER)
1203 continue;
1204 }
1205 else
1206 {
1207 /* 16-bit instruction */
1208 insn_len = 2;
1209
1210 insn >>= 16;
1211 insn_type = nds32_analyze_epilogue_insn16 (insn, cache);
1212 if (insn_type == INSN_RETURN || insn_type == INSN_RECOVER_RETURN)
1213 return 1;
1214 else if (insn_type == INSN_RECOVER)
1215 continue;
1216 }
1217
1218 /* Stop the scan if this is an unexpected instruction. */
1219 break;
1220 }
1221
1222 return 0;
1223}
1224
1225/* Implement the "stack_frame_destroyed_p" gdbarch method. */
1226
1227static int
1228nds32_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR addr)
1229{
1230 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1231 int abi_use_fpr = nds32_abi_use_fpr (tdep->elf_abi);
1232 int insn_type = INSN_NORMAL;
1233 int ret_found = 0;
1234 uint32_t insn;
1235
1236 insn = read_memory_unsigned_integer (addr, 4, BFD_ENDIAN_BIG);
1237
1238 if ((insn & 0x80000000) == 0)
1239 {
1240 /* 32-bit instruction */
1241
1242 insn_type = nds32_analyze_epilogue_insn32 (abi_use_fpr, insn, NULL);
1243 }
1244 else
1245 {
1246 /* 16-bit instruction */
1247
1248 insn >>= 16;
1249 insn_type = nds32_analyze_epilogue_insn16 (insn, NULL);
1250 }
1251
1252 if (insn_type == INSN_NORMAL || insn_type == INSN_RESET_SP)
1253 return 0;
1254
1255 /* Search the required 'return' instruction within the following reasonable
1256 instructions. */
1257 ret_found = nds32_analyze_epilogue (gdbarch, addr, NULL);
1258 if (ret_found == 0)
1259 return 0;
1260
1261 /* Scan backwards to make sure that the last instruction has adjusted
1262 stack. Both a 16-bit and a 32-bit instruction will be tried. This is
1263 just a heuristic, so the false positives will be acceptable. */
1264 insn = read_memory_unsigned_integer (addr - 2, 4, BFD_ENDIAN_BIG);
1265
1266 /* Only 16-bit instructions are possible at addr - 2. */
1267 if ((insn & 0x80000000) != 0)
1268 {
1269 /* This may be a 16-bit instruction or part of a 32-bit instruction. */
1270
1271 insn_type = nds32_analyze_epilogue_insn16 (insn >> 16, NULL);
1272 if (insn_type == INSN_RECOVER)
1273 return 1;
1274 }
1275
1276 insn = read_memory_unsigned_integer (addr - 4, 4, BFD_ENDIAN_BIG);
1277
1278 /* If this is a 16-bit instruction at addr - 4, then there must be another
1279 16-bit instruction at addr - 2, so only 32-bit instructions need to
1280 be analyzed here. */
1281 if ((insn & 0x80000000) == 0)
1282 {
1283 /* This may be a 32-bit instruction or part of a 32-bit instruction. */
1284
1285 insn_type = nds32_analyze_epilogue_insn32 (abi_use_fpr, insn, NULL);
1286 if (insn_type == INSN_RECOVER || insn_type == INSN_RESET_SP)
1287 return 1;
1288 }
1289
1290 return 0;
1291}
1292
1293/* Implement the "sniffer" frame_unwind method. */
1294
1295static int
1296nds32_epilogue_frame_sniffer (const struct frame_unwind *self,
1297 struct frame_info *this_frame, void **this_cache)
1298{
1299 if (frame_relative_level (this_frame) == 0)
1300 return nds32_stack_frame_destroyed_p (get_frame_arch (this_frame),
1301 get_frame_pc (this_frame));
1302 else
1303 return 0;
1304}
1305
1306/* Allocate and fill in *THIS_CACHE with information needed to unwind
1307 *THIS_FRAME within epilogue. Do not do this if *THIS_CACHE was already
1308 allocated. Return a pointer to the current nds32_frame_cache in
1309 *THIS_CACHE. */
1310
1311static struct nds32_frame_cache *
1312nds32_epilogue_frame_cache (struct frame_info *this_frame, void **this_cache)
1313{
1314 struct gdbarch *gdbarch = get_frame_arch (this_frame);
1315 struct nds32_frame_cache *cache;
1316 CORE_ADDR current_pc, current_sp;
1317 int i;
1318
1319 if (*this_cache)
1320 return (struct nds32_frame_cache *) *this_cache;
1321
1322 cache = nds32_alloc_frame_cache ();
1323 *this_cache = cache;
1324
1325 cache->pc = get_frame_func (this_frame);
1326 current_pc = get_frame_pc (this_frame);
1327 nds32_analyze_epilogue (gdbarch, current_pc, cache);
1328
1329 current_sp = get_frame_register_unsigned (this_frame, NDS32_SP_REGNUM);
1330 cache->prev_sp = current_sp + cache->sp_offset;
1331
1332 /* Adjust all the saved registers such that they contain addresses
1333 instead of offsets. */
1334 for (i = 0; i < NDS32_NUM_SAVED_REGS; i++)
1335 if (cache->saved_regs[i] != REG_UNAVAIL)
1336 cache->saved_regs[i] = current_sp + cache->saved_regs[i];
1337
1338 return cache;
1339}
1340
1341/* Implement the "this_id" frame_unwind method. */
1342
1343static void
1344nds32_epilogue_frame_this_id (struct frame_info *this_frame,
1345 void **this_cache, struct frame_id *this_id)
1346{
1347 struct nds32_frame_cache *cache
1348 = nds32_epilogue_frame_cache (this_frame, this_cache);
1349
1350 /* This marks the outermost frame. */
1351 if (cache->prev_sp == 0)
1352 return;
1353
1354 *this_id = frame_id_build (cache->prev_sp, cache->pc);
1355}
1356
1357/* Implement the "prev_register" frame_unwind method. */
1358
1359static struct value *
1360nds32_epilogue_frame_prev_register (struct frame_info *this_frame,
1361 void **this_cache, int regnum)
1362{
1363 struct nds32_frame_cache *cache
1364 = nds32_epilogue_frame_cache (this_frame, this_cache);
1365
1366 if (regnum == NDS32_SP_REGNUM)
1367 return frame_unwind_got_constant (this_frame, regnum, cache->prev_sp);
1368
1369 /* The PC of the previous frame is stored in the LP register of
1370 the current frame. */
1371 if (regnum == NDS32_PC_REGNUM)
1372 regnum = NDS32_LP_REGNUM;
1373
1374 if (regnum < NDS32_NUM_SAVED_REGS && cache->saved_regs[regnum] != REG_UNAVAIL)
1375 return frame_unwind_got_memory (this_frame, regnum,
1376 cache->saved_regs[regnum]);
1377
1378 return frame_unwind_got_register (this_frame, regnum, regnum);
1379}
1380
1381static const struct frame_unwind nds32_epilogue_frame_unwind =
1382{
1383 NORMAL_FRAME,
1384 default_frame_unwind_stop_reason,
1385 nds32_epilogue_frame_this_id,
1386 nds32_epilogue_frame_prev_register,
1387 NULL,
1388 nds32_epilogue_frame_sniffer
1389};
1390\f
1391/* Implement the "dummy_id" gdbarch method. */
1392
1393static struct frame_id
1394nds32_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
1395{
1396 CORE_ADDR sp = get_frame_register_unsigned (this_frame, NDS32_SP_REGNUM);
1397
1398 return frame_id_build (sp, get_frame_pc (this_frame));
1399}
1400
1401/* Implement the "unwind_pc" gdbarch method. */
1402
1403static CORE_ADDR
1404nds32_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
1405{
1406 return frame_unwind_register_unsigned (next_frame, NDS32_PC_REGNUM);
1407}
1408
1409/* Implement the "unwind_sp" gdbarch method. */
1410
1411static CORE_ADDR
1412nds32_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
1413{
1414 return frame_unwind_register_unsigned (next_frame, NDS32_SP_REGNUM);
1415}
1416\f
1417/* Floating type and struct type that has only one floating type member
1418 can pass value using FPU registers (when FPU ABI is used). */
1419
1420static int
1421nds32_check_calling_use_fpr (struct type *type)
1422{
1423 struct type *t;
1424 enum type_code typecode;
1425
1426 t = type;
1427 while (1)
1428 {
1429 t = check_typedef (t);
1430 typecode = TYPE_CODE (t);
1431 if (typecode != TYPE_CODE_STRUCT)
1432 break;
1433 else if (TYPE_NFIELDS (t) != 1)
1434 return 0;
1435 else
1436 t = TYPE_FIELD_TYPE (t, 0);
1437 }
1438
1439 return typecode == TYPE_CODE_FLT;
1440}
1441
1442/* Return the alignment (in bytes) of the given type. */
1443
1444static int
1445nds32_type_align (struct type *type)
1446{
1447 int n;
1448 int align;
1449 int falign;
1450
1451 type = check_typedef (type);
1452 switch (TYPE_CODE (type))
1453 {
1454 default:
1455 /* Should never happen. */
1456 internal_error (__FILE__, __LINE__, _("unknown type alignment"));
1457 return 4;
1458
1459 case TYPE_CODE_PTR:
1460 case TYPE_CODE_ENUM:
1461 case TYPE_CODE_INT:
1462 case TYPE_CODE_FLT:
1463 case TYPE_CODE_SET:
1464 case TYPE_CODE_RANGE:
1465 case TYPE_CODE_REF:
1466 case TYPE_CODE_CHAR:
1467 case TYPE_CODE_BOOL:
1468 return TYPE_LENGTH (type);
1469
1470 case TYPE_CODE_ARRAY:
1471 case TYPE_CODE_COMPLEX:
1472 return nds32_type_align (TYPE_TARGET_TYPE (type));
1473
1474 case TYPE_CODE_STRUCT:
1475 case TYPE_CODE_UNION:
1476 align = 1;
1477 for (n = 0; n < TYPE_NFIELDS (type); n++)
1478 {
1479 falign = nds32_type_align (TYPE_FIELD_TYPE (type, n));
1480 if (falign > align)
1481 align = falign;
1482 }
1483 return align;
1484 }
1485}
1486
1487/* Implement the "push_dummy_call" gdbarch method. */
1488
1489static CORE_ADDR
1490nds32_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
1491 struct regcache *regcache, CORE_ADDR bp_addr,
1492 int nargs, struct value **args, CORE_ADDR sp,
1493 int struct_return, CORE_ADDR struct_addr)
1494{
1495 const int REND = 6; /* End for register offset. */
1496 int goff = 0; /* Current gpr offset for argument. */
1497 int foff = 0; /* Current fpr offset for argument. */
1498 int soff = 0; /* Current stack offset for argument. */
1499 int i;
1500 ULONGEST regval;
1501 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1502 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1503 struct type *func_type = value_type (function);
1504 int abi_use_fpr = nds32_abi_use_fpr (tdep->elf_abi);
1505 int abi_split = nds32_abi_split (tdep->elf_abi);
1506
1507 /* Set the return address. For the NDS32, the return breakpoint is
1508 always at BP_ADDR. */
1509 regcache_cooked_write_unsigned (regcache, NDS32_LP_REGNUM, bp_addr);
1510
1511 /* If STRUCT_RETURN is true, then the struct return address (in
1512 STRUCT_ADDR) will consume the first argument-passing register.
1513 Both adjust the register count and store that value. */
1514 if (struct_return)
1515 {
1516 regcache_cooked_write_unsigned (regcache, NDS32_R0_REGNUM, struct_addr);
1517 goff++;
1518 }
1519
1520 /* Now make sure there's space on the stack */
1521 for (i = 0; i < nargs; i++)
1522 {
1523 struct type *type = value_type (args[i]);
1524 int align = nds32_type_align (type);
1525
1526 /* If align is zero, it may be an empty struct.
1527 Just ignore the argument of empty struct. */
1528 if (align == 0)
1529 continue;
1530
1531 sp -= TYPE_LENGTH (type);
1532 sp = align_down (sp, align);
1533 }
1534
1535 /* Stack must be 8-byte aligned. */
1536 sp = align_down (sp, 8);
1537
1538 soff = 0;
1539 for (i = 0; i < nargs; i++)
1540 {
1541 const gdb_byte *val;
1542 int align, len;
1543 struct type *type;
1544 int calling_use_fpr;
1545 int use_fpr = 0;
1546
1547 type = value_type (args[i]);
1548 calling_use_fpr = nds32_check_calling_use_fpr (type);
1549 len = TYPE_LENGTH (type);
1550 align = nds32_type_align (type);
1551 val = value_contents (args[i]);
1552
1553 /* The size of a composite type larger than 4 bytes will be rounded
1554 up to the nearest multiple of 4. */
1555 if (len > 4)
1556 len = align_up (len, 4);
1557
1558 /* Variadic functions are handled differently between AABI and ABI2FP+.
1559
1560 For AABI, the caller pushes arguments in registers, callee stores
1561 unnamed arguments in stack, and then va_arg fetch arguments in stack.
1562 Therefore, we don't have to handle variadic functions specially.
1563
1564 For ABI2FP+, the caller pushes only named arguments in registers
1565 and pushes all unnamed arguments in stack. */
1566
1567 if (abi_use_fpr && TYPE_VARARGS (func_type)
1568 && i >= TYPE_NFIELDS (func_type))
1569 goto use_stack;
1570
1571 /* Try to use FPRs to pass arguments only when
1572 1. The program is built using toolchain with FPU support.
1573 2. The type of this argument can use FPR to pass value. */
1574 use_fpr = abi_use_fpr && calling_use_fpr;
1575
1576 if (use_fpr)
1577 {
1578 if (tdep->fpu_freg == -1)
1579 goto error_no_fpr;
1580
1581 /* Adjust alignment. */
1582 if ((align >> 2) > 0)
1583 foff = align_up (foff, align >> 2);
1584
1585 if (foff < REND)
1586 {
1587 switch (len)
1588 {
1589 case 4:
b66f5587 1590 regcache->cooked_write (tdep->fs0_regnum + foff, val);
a28d8e50
YTL		 1591 foff++;
1592 break;
1593 case 8:
b66f5587 1594 regcache->cooked_write (NDS32_FD0_REGNUM + (foff >> 1), val);
a28d8e50
YTL		 1595 foff += 2;
1596 break;
1597 default:
1598 /* Long double? */
1599 internal_error (__FILE__, __LINE__,
1600 "Do not know how to handle %d-byte double.\n",
1601 len);
1602 break;
1603 }
1604 continue;
1605 }
1606 }
1607 else
1608 {
1609 /*
1610 When passing arguments using GPRs,
1611
1612 * A composite type not larger than 4 bytes is passed in $rN.
1613 The format is as if the value is loaded with load instruction
1614 of corresponding size (e.g., LB, LH, LW).
1615
1616 For example,
1617
1618 r0
1619 31 0
1620 LITTLE: [x x b a]
1621 BIG: [x x a b]
1622
1623 * Otherwise, a composite type is passed in consecutive registers.
1624 The size is rounded up to the nearest multiple of 4.
1625 The successive registers hold the parts of the argument as if
1626 were loaded using lmw instructions.
1627
1628 For example,
1629
1630 r0 r1
1631 31 0 31 0
1632 LITTLE: [d c b a] [x x x e]
1633 BIG: [a b c d] [e x x x]
1634 */
1635
1636 /* Adjust alignment. */
1637 if ((align >> 2) > 0)
1638 goff = align_up (goff, align >> 2);
1639
1640 if (len <= (REND - goff) * 4)
1641 {
1642 /* This argument can be passed wholly via GPRs. */
1643 while (len > 0)
1644 {
1645 regval = extract_unsigned_integer (val, (len > 4) ? 4 : len,
1646 byte_order);
1647 regcache_cooked_write_unsigned (regcache,
1648 NDS32_R0_REGNUM + goff,
1649 regval);
1650 len -= 4;
1651 val += 4;
1652 goff++;
1653 }
1654 continue;
1655 }
1656 else if (abi_split)
1657 {
1658 /* Some parts of this argument can be passed via GPRs. */
1659 while (goff < REND)
1660 {
1661 regval = extract_unsigned_integer (val, (len > 4) ? 4 : len,
1662 byte_order);
1663 regcache_cooked_write_unsigned (regcache,
1664 NDS32_R0_REGNUM + goff,
1665 regval);
1666 len -= 4;
1667 val += 4;
1668 goff++;
1669 }
1670 }
1671 }
1672
1673use_stack:
1674 /*
1675 When pushing (split parts of) an argument into stack,
1676
1677 * A composite type not larger than 4 bytes is copied to different
1678 base address.
1679 In little-endian, the first byte of this argument is aligned
1680 at the low address of the next free word.
1681 In big-endian, the last byte of this argument is aligned
1682 at the high address of the next free word.
1683
1684 For example,
1685
1686 sp [ - ] [ c ] hi
1687 [ c ] [ b ]
1688 [ b ] [ a ]
1689 [ a ] [ - ] lo
1690 LITTLE BIG
1691 */
1692
1693 /* Adjust alignment. */
1694 soff = align_up (soff, align);
1695
1696 while (len > 0)
1697 {
1698 int rlen = (len > 4) ? 4 : len;
1699
1700 if (byte_order == BFD_ENDIAN_BIG)
1701 write_memory (sp + soff + 4 - rlen, val, rlen);
1702 else
1703 write_memory (sp + soff, val, rlen);
1704
1705 len -= 4;
1706 val += 4;
1707 soff += 4;
1708 }
1709 }
1710
1711 /* Finally, update the SP register. */
1712 regcache_cooked_write_unsigned (regcache, NDS32_SP_REGNUM, sp);
1713
1714 return sp;
1715
1716error_no_fpr:
1717 /* If use_fpr, but no floating-point register exists,
1718 then it is an error. */
1719 error (_("Fail to call. FPU registers are required."));
1720}
1721\f
1722/* Read, for architecture GDBARCH, a function return value of TYPE
1723 from REGCACHE, and copy that into VALBUF. */
1724
1725static void
1726nds32_extract_return_value (struct gdbarch *gdbarch, struct type *type,
1727 struct regcache *regcache, gdb_byte *valbuf)
1728{
1729 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1730 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1731 int abi_use_fpr = nds32_abi_use_fpr (tdep->elf_abi);
1732 int calling_use_fpr;
1733 int len;
1734
1735 calling_use_fpr = nds32_check_calling_use_fpr (type);
1736 len = TYPE_LENGTH (type);
1737
1738 if (abi_use_fpr && calling_use_fpr)
1739 {
1740 if (len == 4)
dca08e1f 1741 regcache->cooked_read (tdep->fs0_regnum, valbuf);
a28d8e50 1742 else if (len == 8)
dca08e1f 1743 regcache->cooked_read (NDS32_FD0_REGNUM, valbuf);
a28d8e50
YTL		 1744 else
1745 internal_error (__FILE__, __LINE__,
1746 _("Cannot extract return value of %d bytes "
1747 "long floating-point."), len);
1748 }
1749 else
1750 {
1751 /*
1752 When returning result,
1753
1754 * A composite type not larger than 4 bytes is returned in $r0.
1755 The format is as if the result is loaded with load instruction
1756 of corresponding size (e.g., LB, LH, LW).
1757
1758 For example,
1759
1760 r0
1761 31 0
1762 LITTLE: [x x b a]
1763 BIG: [x x a b]
1764
1765 * Otherwise, a composite type not larger than 8 bytes is returned
1766 in $r0 and $r1.
1767 In little-endian, the first word is loaded in $r0.
1768 In big-endian, the last word is loaded in $r1.
1769
1770 For example,
1771
1772 r0 r1
1773 31 0 31 0
1774 LITTLE: [d c b a] [x x x e]
1775 BIG: [x x x a] [b c d e]
1776 */
1777
1778 ULONGEST tmp;
1779
1780 if (len < 4)
1781 {
1782 /* By using store_unsigned_integer we avoid having to do
1783 anything special for small big-endian values. */
1784 regcache_cooked_read_unsigned (regcache, NDS32_R0_REGNUM, &tmp);
1785 store_unsigned_integer (valbuf, len, byte_order, tmp);
1786 }
1787 else if (len == 4)
1788 {
dca08e1f 1789 regcache->cooked_read (NDS32_R0_REGNUM, valbuf);
a28d8e50
YTL		 1790 }
1791 else if (len < 8)
1792 {
1793 int len1, len2;
1794
1795 len1 = byte_order == BFD_ENDIAN_BIG ? len - 4 : 4;
1796 len2 = len - len1;
1797
1798 regcache_cooked_read_unsigned (regcache, NDS32_R0_REGNUM, &tmp);
1799 store_unsigned_integer (valbuf, len1, byte_order, tmp);
1800
1801 regcache_cooked_read_unsigned (regcache, NDS32_R0_REGNUM + 1, &tmp);
1802 store_unsigned_integer (valbuf + len1, len2, byte_order, tmp);
1803 }
1804 else
1805 {
dca08e1f
SM		 1806 regcache->cooked_read (NDS32_R0_REGNUM, valbuf);
1807 regcache->cooked_read (NDS32_R0_REGNUM + 1, valbuf + 4);
a28d8e50
YTL		 1808 }
1809 }
1810}
1811
1812/* Write, for architecture GDBARCH, a function return value of TYPE
1813 from VALBUF into REGCACHE. */
1814
1815static void
1816nds32_store_return_value (struct gdbarch *gdbarch, struct type *type,
1817 struct regcache *regcache, const gdb_byte *valbuf)
1818{
1819 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1820 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1821 int abi_use_fpr = nds32_abi_use_fpr (tdep->elf_abi);
1822 int calling_use_fpr;
1823 int len;
1824
1825 calling_use_fpr = nds32_check_calling_use_fpr (type);
1826 len = TYPE_LENGTH (type);
1827
1828 if (abi_use_fpr && calling_use_fpr)
1829 {
1830 if (len == 4)
b66f5587 1831 regcache->cooked_write (tdep->fs0_regnum, valbuf);
a28d8e50 1832 else if (len == 8)
b66f5587 1833 regcache->cooked_write (NDS32_FD0_REGNUM, valbuf);
a28d8e50
YTL		 1834 else
1835 internal_error (__FILE__, __LINE__,
1836 _("Cannot store return value of %d bytes "
1837 "long floating-point."), len);
1838 }
1839 else
1840 {
1841 ULONGEST regval;
1842
1843 if (len < 4)
1844 {
1845 regval = extract_unsigned_integer (valbuf, len, byte_order);
1846 regcache_cooked_write_unsigned (regcache, NDS32_R0_REGNUM, regval);
1847 }
1848 else if (len == 4)
1849 {
b66f5587 1850 regcache->cooked_write (NDS32_R0_REGNUM, valbuf);
a28d8e50
YTL		 1851 }
1852 else if (len < 8)
1853 {
1854 int len1, len2;
1855
1856 len1 = byte_order == BFD_ENDIAN_BIG ? len - 4 : 4;
1857 len2 = len - len1;
1858
1859 regval = extract_unsigned_integer (valbuf, len1, byte_order);
1860 regcache_cooked_write_unsigned (regcache, NDS32_R0_REGNUM, regval);
1861
1862 regval = extract_unsigned_integer (valbuf + len1, len2, byte_order);
1863 regcache_cooked_write_unsigned (regcache, NDS32_R0_REGNUM + 1,
1864 regval);
1865 }
1866 else
1867 {
b66f5587
SM		 1868 regcache->cooked_write (NDS32_R0_REGNUM, valbuf);
1869 regcache->cooked_write (NDS32_R0_REGNUM + 1, valbuf + 4);
a28d8e50
YTL		 1870 }
1871 }
1872}
1873
1874/* Implement the "return_value" gdbarch method.
1875
1876 Determine, for architecture GDBARCH, how a return value of TYPE
1877 should be returned. If it is supposed to be returned in registers,
1878 and READBUF is non-zero, read the appropriate value from REGCACHE,
1879 and copy it into READBUF. If WRITEBUF is non-zero, write the value
1880 from WRITEBUF into REGCACHE. */
1881
1882static enum return_value_convention
1883nds32_return_value (struct gdbarch *gdbarch, struct value *func_type,
1884 struct type *type, struct regcache *regcache,
1885 gdb_byte *readbuf, const gdb_byte *writebuf)
1886{
1887 if (TYPE_LENGTH (type) > 8)
1888 {
1889 return RETURN_VALUE_STRUCT_CONVENTION;
1890 }
1891 else
1892 {
1893 if (readbuf != NULL)
1894 nds32_extract_return_value (gdbarch, type, regcache, readbuf);
1895 if (writebuf != NULL)
1896 nds32_store_return_value (gdbarch, type, regcache, writebuf);
1897
1898 return RETURN_VALUE_REGISTER_CONVENTION;
1899 }
1900}
1901\f
1902/* Implement the "get_longjmp_target" gdbarch method. */
1903
1904static int
1905nds32_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
1906{
1907 gdb_byte buf[4];
1908 CORE_ADDR jb_addr;
1909 struct gdbarch *gdbarch = get_frame_arch (frame);
1910 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1911
1912 jb_addr = get_frame_register_unsigned (frame, NDS32_R0_REGNUM);
1913
1914 if (target_read_memory (jb_addr + 11 * 4, buf, 4))
1915 return 0;
1916
1917 *pc = extract_unsigned_integer (buf, 4, byte_order);
1918 return 1;
1919}
1920\f
1921/* Validate the given TDESC, and fixed-number some registers in it.
1922 Return 0 if the given TDESC does not contain the required feature
1923 or not contain required registers. */
1924
1925static int
1926nds32_validate_tdesc_p (const struct target_desc *tdesc,
1927 struct tdesc_arch_data *tdesc_data,
1928 int *fpu_freg, int *use_pseudo_fsrs)
1929{
1930 const struct tdesc_feature *feature;
1931 int i, valid_p;
1932
1933 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.nds32.core");
1934 if (feature == NULL)
1935 return 0;
1936
1937 valid_p = 1;
1938 /* Validate and fixed-number R0-R10. */
1939 for (i = NDS32_R0_REGNUM; i <= NDS32_R0_REGNUM + 10; i++)
1940 valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
1941 nds32_register_names[i]);
1942
1943 /* Validate R15. */
1944 valid_p &= tdesc_unnumbered_register (feature,
1945 nds32_register_names[NDS32_TA_REGNUM]);
1946
1947 /* Validate and fixed-number FP, GP, LP, SP, PC. */
1948 for (i = NDS32_FP_REGNUM; i <= NDS32_PC_REGNUM; i++)
1949 valid_p &= tdesc_numbered_register (feature, tdesc_data, i,
1950 nds32_register_names[i]);
1951
1952 if (!valid_p)
1953 return 0;
1954
1955 /* Fixed-number R11-R27. */
1956 for (i = NDS32_R0_REGNUM + 11; i <= NDS32_R0_REGNUM + 27; i++)
1957 tdesc_numbered_register (feature, tdesc_data, i, nds32_register_names[i]);
1958
1959 feature = tdesc_find_feature (tdesc, "org.gnu.gdb.nds32.fpu");
1960 if (feature != NULL)
1961 {
1962 int num_fdr_regs, num_fsr_regs, fs0_regnum, num_listed_fsr;
1963 int freg = -1;
1964
1965 /* Guess FPU configuration via listed registers. */
1966 if (tdesc_unnumbered_register (feature, "fd31"))
1967 freg = 3;
1968 else if (tdesc_unnumbered_register (feature, "fd15"))
1969 freg = 2;
1970 else if (tdesc_unnumbered_register (feature, "fd7"))
1971 freg = 1;
1972 else if (tdesc_unnumbered_register (feature, "fd3"))
1973 freg = 0;
1974
1975 if (freg == -1)
1976 /* Required FDR is not found. */
1977 return 0;
1978 else
1979 *fpu_freg = freg;
1980
1981 /* Validate and fixed-number required FDRs. */
1982 num_fdr_regs = num_fdr_map[freg];
1983 for (i = 0; i < num_fdr_regs; i++)
1984 valid_p &= tdesc_numbered_register (feature, tdesc_data,
1985 NDS32_FD0_REGNUM + i,
1986 nds32_fdr_register_names[i]);
1987 if (!valid_p)
1988 return 0;
1989
1990 /* Count the number of listed FSRs, and fixed-number them if present. */
1991 num_fsr_regs = num_fsr_map[freg];
1992 fs0_regnum = NDS32_FD0_REGNUM + num_fdr_regs;
1993 num_listed_fsr = 0;
1994 for (i = 0; i < num_fsr_regs; i++)
1995 num_listed_fsr += tdesc_numbered_register (feature, tdesc_data,
1996 fs0_regnum + i,
1997 nds32_fsr_register_names[i]);
1998
1999 if (num_listed_fsr == 0)
2000 /* No required FSRs are listed explicitly, make them pseudo registers
2001 of FDRs. */
2002 *use_pseudo_fsrs = 1;
2003 else if (num_listed_fsr == num_fsr_regs)
2004 /* All required FSRs are listed explicitly. */
2005 *use_pseudo_fsrs = 0;
2006 else
2007 /* Some required FSRs are missing. */
2008 return 0;
2009 }
2010
2011 return 1;
2012}
2013
2014/* Initialize the current architecture based on INFO. If possible,
2015 re-use an architecture from ARCHES, which is a list of
2016 architectures already created during this debugging session.
2017
2018 Called e.g. at program startup, when reading a core file, and when
2019 reading a binary file. */
2020
2021static struct gdbarch *
2022nds32_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
2023{
2024 struct gdbarch *gdbarch;
2025 struct gdbarch_tdep *tdep;
2026 struct gdbarch_list *best_arch;
2027 struct tdesc_arch_data *tdesc_data = NULL;
2028 const struct target_desc *tdesc = info.target_desc;
2029 int elf_abi = E_NDS_ABI_AABI;
2030 int fpu_freg = -1;
2031 int use_pseudo_fsrs = 0;
2032 int i, num_regs, maxregs;
2033
2034 /* Extract the elf_flags if available. */
2035 if (info.abfd && bfd_get_flavour (info.abfd) == bfd_target_elf_flavour)
2036 elf_abi = elf_elfheader (info.abfd)->e_flags & EF_NDS_ABI;
2037
2038 /* If there is already a candidate, use it. */
2039 for (best_arch = gdbarch_list_lookup_by_info (arches, &info);
2040 best_arch != NULL;
2041 best_arch = gdbarch_list_lookup_by_info (best_arch->next, &info))
2042 {
2043 struct gdbarch_tdep *idep = gdbarch_tdep (best_arch->gdbarch);
2044
2045 if (idep->elf_abi != elf_abi)
2046 continue;
2047
2048 /* Found a match. */
2049 break;
2050 }
2051
2052 if (best_arch != NULL)
2053 return best_arch->gdbarch;
2054
2055 if (!tdesc_has_registers (tdesc))
2056 tdesc = tdesc_nds32;
2057
2058 tdesc_data = tdesc_data_alloc ();
2059
2060 if (!nds32_validate_tdesc_p (tdesc, tdesc_data, &fpu_freg, &use_pseudo_fsrs))
2061 {
2062 tdesc_data_cleanup (tdesc_data);
2063 return NULL;
2064 }
2065
2066 /* Allocate space for the new architecture. */
2067 tdep = XCNEW (struct gdbarch_tdep);
2068 tdep->fpu_freg = fpu_freg;
2069 tdep->use_pseudo_fsrs = use_pseudo_fsrs;
2070 tdep->fs0_regnum = -1;
2071 tdep->elf_abi = elf_abi;
2072
2073 gdbarch = gdbarch_alloc (&info, tdep);
2074
53375380
PA		 2075 set_gdbarch_wchar_bit (gdbarch, 16);
2076 set_gdbarch_wchar_signed (gdbarch, 0);
2077
a28d8e50
YTL		 2078 if (fpu_freg == -1)
2079 num_regs = NDS32_NUM_REGS;
2080 else if (use_pseudo_fsrs == 1)
2081 {
2082 set_gdbarch_pseudo_register_read (gdbarch, nds32_pseudo_register_read);
2083 set_gdbarch_pseudo_register_write (gdbarch, nds32_pseudo_register_write);
2084 set_tdesc_pseudo_register_name (gdbarch, nds32_pseudo_register_name);
2085 set_tdesc_pseudo_register_type (gdbarch, nds32_pseudo_register_type);
2086 set_gdbarch_num_pseudo_regs (gdbarch, num_fsr_map[fpu_freg]);
2087
2088 num_regs = NDS32_NUM_REGS + num_fdr_map[fpu_freg];
2089 }
2090 else
2091 num_regs = NDS32_NUM_REGS + num_fdr_map[fpu_freg] + num_fsr_map[fpu_freg];
2092
2093 set_gdbarch_num_regs (gdbarch, num_regs);
2094 tdesc_use_registers (gdbarch, tdesc, tdesc_data);
2095
2096 /* Cache the register number of fs0. */
2097 if (fpu_freg != -1)
2098 tdep->fs0_regnum = user_reg_map_name_to_regnum (gdbarch, "fs0", -1);
2099
2100 /* Add NDS32 register aliases. To avoid search in user register name space,
2101 user_reg_map_name_to_regnum is not used. */
2102 maxregs = (gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch));
2103 for (i = 0; i < ARRAY_SIZE (nds32_register_aliases); i++)
2104 {
2105 int regnum, j;
2106
2107 regnum = -1;
2108 /* Search register name space. */
2109 for (j = 0; j < maxregs; j++)
2110 {
2111 const char *regname = gdbarch_register_name (gdbarch, j);
2112
2113 if (regname != NULL
2114 && strcmp (regname, nds32_register_aliases[i].name) == 0)
2115 {
2116 regnum = j;
2117 break;
2118 }
2119 }
2120
2121 /* Try next alias entry if the given name can not be found in register
2122 name space. */
2123 if (regnum == -1)
2124 continue;
2125
2126 user_reg_add (gdbarch, nds32_register_aliases[i].alias,
2127 value_of_nds32_reg, (const void *) (intptr_t) regnum);
2128 }
2129
2130 nds32_add_reggroups (gdbarch);
2131
2132 /* Hook in ABI-specific overrides, if they have been registered. */
0dba2a6c 2133 info.tdesc_data = tdesc_data;
a28d8e50
YTL		 2134 gdbarch_init_osabi (info, gdbarch);
2135
2136 /* Override tdesc_register callbacks for system registers. */
2137 set_gdbarch_register_reggroup_p (gdbarch, nds32_register_reggroup_p);
2138
2139 set_gdbarch_sp_regnum (gdbarch, NDS32_SP_REGNUM);
2140 set_gdbarch_pc_regnum (gdbarch, NDS32_PC_REGNUM);
2141 set_gdbarch_unwind_sp (gdbarch, nds32_unwind_sp);
2142 set_gdbarch_unwind_pc (gdbarch, nds32_unwind_pc);
2143 set_gdbarch_stack_frame_destroyed_p (gdbarch, nds32_stack_frame_destroyed_p);
2144 set_gdbarch_dwarf2_reg_to_regnum (gdbarch, nds32_dwarf2_reg_to_regnum);
2145
2146 set_gdbarch_push_dummy_call (gdbarch, nds32_push_dummy_call);
2147 set_gdbarch_return_value (gdbarch, nds32_return_value);
2148 set_gdbarch_dummy_id (gdbarch, nds32_dummy_id);
2149
2150 set_gdbarch_skip_prologue (gdbarch, nds32_skip_prologue);
2151 set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
04180708
YQ		 2152 set_gdbarch_breakpoint_kind_from_pc (gdbarch,
2153 nds32_breakpoint::kind_from_pc);
2154 set_gdbarch_sw_breakpoint_from_kind (gdbarch,
2155 nds32_breakpoint::bp_from_kind);
a28d8e50
YTL		 2156
2157 set_gdbarch_frame_align (gdbarch, nds32_frame_align);
2158 frame_base_set_default (gdbarch, &nds32_frame_base);
2159
a28d8e50
YTL		 2160 /* Handle longjmp. */
2161 set_gdbarch_get_longjmp_target (gdbarch, nds32_get_longjmp_target);
2162
2163 /* The order of appending is the order it check frame. */
2164 dwarf2_append_unwinders (gdbarch);
2165 frame_unwind_append_unwinder (gdbarch, &nds32_epilogue_frame_unwind);
2166 frame_unwind_append_unwinder (gdbarch, &nds32_frame_unwind);
2167
2168 return gdbarch;
2169}
2170
2171void
2172_initialize_nds32_tdep (void)
2173{
2174 /* Initialize gdbarch. */
2175 register_gdbarch_init (bfd_arch_nds32, nds32_gdbarch_init);
2176
2177 initialize_tdesc_nds32 ();
2178 nds32_init_reggroups ();
2179}
GDB Binutils - Deliverables
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