Commit | Line | Data |
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ca3bf3bd DJ |
1 | /* Target-dependent code for the Xtensa port of GDB, the GNU debugger. |
2 | ||
e2882c85 | 3 | Copyright (C) 2003-2018 Free Software Foundation, Inc. |
ca3bf3bd DJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
ca3bf3bd DJ |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
ca3bf3bd DJ |
19 | |
20 | #include "defs.h" | |
21 | #include "frame.h" | |
ee967b5f | 22 | #include "solib-svr4.h" |
ca3bf3bd DJ |
23 | #include "symtab.h" |
24 | #include "symfile.h" | |
25 | #include "objfiles.h" | |
26 | #include "gdbtypes.h" | |
27 | #include "gdbcore.h" | |
28 | #include "value.h" | |
29 | #include "dis-asm.h" | |
30 | #include "inferior.h" | |
40045d91 | 31 | #include "osabi.h" |
ca3bf3bd DJ |
32 | #include "regcache.h" |
33 | #include "reggroups.h" | |
34 | #include "regset.h" | |
35 | ||
36 | #include "dummy-frame.h" | |
fa8f86ff | 37 | #include "dwarf2.h" |
ca3bf3bd DJ |
38 | #include "dwarf2-frame.h" |
39 | #include "dwarf2loc.h" | |
ca3bf3bd DJ |
40 | #include "frame-base.h" |
41 | #include "frame-unwind.h" | |
42 | ||
43 | #include "arch-utils.h" | |
44 | #include "gdbarch.h" | |
45 | #include "remote.h" | |
46 | #include "serial.h" | |
47 | ||
48 | #include "command.h" | |
49 | #include "gdbcmd.h" | |
ca3bf3bd | 50 | |
bdb4c075 | 51 | #include "xtensa-isa.h" |
ca3bf3bd | 52 | #include "xtensa-tdep.h" |
94a0e877 | 53 | #include "xtensa-config.h" |
325fac50 | 54 | #include <algorithm> |
ca3bf3bd DJ |
55 | |
56 | ||
ccce17b0 | 57 | static unsigned int xtensa_debug_level = 0; |
ca3bf3bd DJ |
58 | |
59 | #define DEBUGWARN(args...) \ | |
60 | if (xtensa_debug_level > 0) \ | |
61 | fprintf_unfiltered (gdb_stdlog, "(warn ) " args) | |
62 | ||
63 | #define DEBUGINFO(args...) \ | |
64 | if (xtensa_debug_level > 1) \ | |
65 | fprintf_unfiltered (gdb_stdlog, "(info ) " args) | |
66 | ||
67 | #define DEBUGTRACE(args...) \ | |
68 | if (xtensa_debug_level > 2) \ | |
69 | fprintf_unfiltered (gdb_stdlog, "(trace) " args) | |
70 | ||
71 | #define DEBUGVERB(args...) \ | |
72 | if (xtensa_debug_level > 3) \ | |
73 | fprintf_unfiltered (gdb_stdlog, "(verb ) " args) | |
74 | ||
75 | ||
76 | /* According to the ABI, the SP must be aligned to 16-byte boundaries. */ | |
ca3bf3bd DJ |
77 | #define SP_ALIGNMENT 16 |
78 | ||
79 | ||
bdb4c075 MG |
80 | /* On Windowed ABI, we use a6 through a11 for passing arguments |
81 | to a function called by GDB because CALL4 is used. */ | |
bdb4c075 MG |
82 | #define ARGS_NUM_REGS 6 |
83 | #define REGISTER_SIZE 4 | |
ca3bf3bd | 84 | |
ca3bf3bd | 85 | |
bdb4c075 MG |
86 | /* Extract the call size from the return address or PS register. */ |
87 | #define PS_CALLINC_SHIFT 16 | |
88 | #define PS_CALLINC_MASK 0x00030000 | |
89 | #define CALLINC(ps) (((ps) & PS_CALLINC_MASK) >> PS_CALLINC_SHIFT) | |
90 | #define WINSIZE(ra) (4 * (( (ra) >> 30) & 0x3)) | |
ca3bf3bd | 91 | |
98689b25 MG |
92 | /* On TX, hardware can be configured without Exception Option. |
93 | There is no PS register in this case. Inside XT-GDB, let us treat | |
94 | it as a virtual read-only register always holding the same value. */ | |
95 | #define TX_PS 0x20 | |
96 | ||
bdb4c075 | 97 | /* ABI-independent macros. */ |
91d8eb23 MD |
98 | #define ARG_NOF(gdbarch) \ |
99 | (gdbarch_tdep (gdbarch)->call_abi \ | |
100 | == CallAbiCall0Only ? C0_NARGS : (ARGS_NUM_REGS)) | |
101 | #define ARG_1ST(gdbarch) \ | |
102 | (gdbarch_tdep (gdbarch)->call_abi == CallAbiCall0Only \ | |
94a0e877 | 103 | ? (gdbarch_tdep (gdbarch)->a0_base + C0_ARGS) \ |
91d8eb23 | 104 | : (gdbarch_tdep (gdbarch)->a0_base + 6)) |
ca3bf3bd | 105 | |
ca3bf3bd DJ |
106 | /* XTENSA_IS_ENTRY tests whether the first byte of an instruction |
107 | indicates that the instruction is an ENTRY instruction. */ | |
108 | ||
91d8eb23 MD |
109 | #define XTENSA_IS_ENTRY(gdbarch, op1) \ |
110 | ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) \ | |
4c6b5505 | 111 | ? ((op1) == 0x6c) : ((op1) == 0x36)) |
ca3bf3bd | 112 | |
bdb4c075 | 113 | #define XTENSA_ENTRY_LENGTH 3 |
ca3bf3bd DJ |
114 | |
115 | /* windowing_enabled() returns true, if windowing is enabled. | |
116 | WOE must be set to 1; EXCM to 0. | |
117 | Note: We assume that EXCM is always 0 for XEA1. */ | |
118 | ||
bdb4c075 MG |
119 | #define PS_WOE (1<<18) |
120 | #define PS_EXC (1<<4) | |
121 | ||
0dd5cbc5 AH |
122 | /* Big enough to hold the size of the largest register in bytes. */ |
123 | #define XTENSA_MAX_REGISTER_SIZE 64 | |
124 | ||
b801de47 | 125 | static int |
98689b25 MG |
126 | windowing_enabled (struct gdbarch *gdbarch, unsigned int ps) |
127 | { | |
128 | /* If we know CALL0 ABI is set explicitly, say it is Call0. */ | |
129 | if (gdbarch_tdep (gdbarch)->call_abi == CallAbiCall0Only) | |
130 | return 0; | |
131 | ||
132 | return ((ps & PS_EXC) == 0 && (ps & PS_WOE) != 0); | |
133 | } | |
134 | ||
581e13c1 MS |
135 | /* Convert a live A-register number to the corresponding AR-register |
136 | number. */ | |
91d8eb23 | 137 | static int |
ee967b5f | 138 | arreg_number (struct gdbarch *gdbarch, int a_regnum, ULONGEST wb) |
91d8eb23 MD |
139 | { |
140 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
ee967b5f | 141 | int arreg; |
91d8eb23 | 142 | |
ee967b5f MG |
143 | arreg = a_regnum - tdep->a0_base; |
144 | arreg += (wb & ((tdep->num_aregs - 1) >> 2)) << WB_SHIFT; | |
145 | arreg &= tdep->num_aregs - 1; | |
91d8eb23 | 146 | |
ee967b5f MG |
147 | return arreg + tdep->ar_base; |
148 | } | |
149 | ||
150 | /* Convert a live AR-register number to the corresponding A-register order | |
151 | number in a range [0..15]. Return -1, if AR_REGNUM is out of WB window. */ | |
152 | static int | |
153 | areg_number (struct gdbarch *gdbarch, int ar_regnum, unsigned int wb) | |
154 | { | |
155 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
156 | int areg; | |
157 | ||
158 | areg = ar_regnum - tdep->ar_base; | |
159 | if (areg < 0 || areg >= tdep->num_aregs) | |
160 | return -1; | |
161 | areg = (areg - wb * 4) & (tdep->num_aregs - 1); | |
162 | return (areg > 15) ? -1 : areg; | |
91d8eb23 MD |
163 | } |
164 | ||
68d6df83 | 165 | /* Read Xtensa register directly from the hardware. */ |
b801de47 | 166 | static unsigned long |
08b9c608 MG |
167 | xtensa_read_register (int regnum) |
168 | { | |
169 | ULONGEST value; | |
170 | ||
171 | regcache_raw_read_unsigned (get_current_regcache (), regnum, &value); | |
172 | return (unsigned long) value; | |
173 | } | |
174 | ||
68d6df83 | 175 | /* Write Xtensa register directly to the hardware. */ |
b801de47 | 176 | static void |
08b9c608 MG |
177 | xtensa_write_register (int regnum, ULONGEST value) |
178 | { | |
179 | regcache_raw_write_unsigned (get_current_regcache (), regnum, value); | |
180 | } | |
181 | ||
ca3bf3bd DJ |
182 | /* Return the window size of the previous call to the function from which we |
183 | have just returned. | |
184 | ||
185 | This function is used to extract the return value after a called function | |
bdb4c075 | 186 | has returned to the caller. On Xtensa, the register that holds the return |
ca3bf3bd DJ |
187 | value (from the perspective of the caller) depends on what call |
188 | instruction was used. For now, we are assuming that the call instruction | |
189 | precedes the current address, so we simply analyze the call instruction. | |
190 | If we are in a dummy frame, we simply return 4 as we used a 'pseudo-call4' | |
191 | method to call the inferior function. */ | |
192 | ||
193 | static int | |
91d8eb23 | 194 | extract_call_winsize (struct gdbarch *gdbarch, CORE_ADDR pc) |
ca3bf3bd | 195 | { |
e17a4113 | 196 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
bdb4c075 | 197 | int winsize = 4; |
ca3bf3bd | 198 | int insn; |
ff7a4c00 | 199 | gdb_byte buf[4]; |
ca3bf3bd DJ |
200 | |
201 | DEBUGTRACE ("extract_call_winsize (pc = 0x%08x)\n", (int) pc); | |
202 | ||
203 | /* Read the previous instruction (should be a call[x]{4|8|12}. */ | |
204 | read_memory (pc-3, buf, 3); | |
e17a4113 | 205 | insn = extract_unsigned_integer (buf, 3, byte_order); |
ca3bf3bd DJ |
206 | |
207 | /* Decode call instruction: | |
208 | Little Endian | |
209 | call{0,4,8,12} OFFSET || {00,01,10,11} || 0101 | |
210 | callx{0,4,8,12} OFFSET || 11 || {00,01,10,11} || 0000 | |
211 | Big Endian | |
212 | call{0,4,8,12} 0101 || {00,01,10,11} || OFFSET | |
213 | callx{0,4,8,12} 0000 || {00,01,10,11} || 11 || OFFSET. */ | |
214 | ||
e17a4113 | 215 | if (byte_order == BFD_ENDIAN_LITTLE) |
ca3bf3bd DJ |
216 | { |
217 | if (((insn & 0xf) == 0x5) || ((insn & 0xcf) == 0xc0)) | |
bdb4c075 | 218 | winsize = (insn & 0x30) >> 2; /* 0, 4, 8, 12. */ |
ca3bf3bd DJ |
219 | } |
220 | else | |
221 | { | |
222 | if (((insn >> 20) == 0x5) || (((insn >> 16) & 0xf3) == 0x03)) | |
bdb4c075 | 223 | winsize = (insn >> 16) & 0xc; /* 0, 4, 8, 12. */ |
ca3bf3bd DJ |
224 | } |
225 | return winsize; | |
226 | } | |
227 | ||
228 | ||
229 | /* REGISTER INFORMATION */ | |
230 | ||
08b9c608 MG |
231 | /* Find register by name. */ |
232 | static int | |
a121b7c1 | 233 | xtensa_find_register_by_name (struct gdbarch *gdbarch, const char *name) |
08b9c608 MG |
234 | { |
235 | int i; | |
236 | ||
237 | for (i = 0; i < gdbarch_num_regs (gdbarch) | |
238 | + gdbarch_num_pseudo_regs (gdbarch); | |
239 | i++) | |
240 | ||
241 | if (strcasecmp (gdbarch_tdep (gdbarch)->regmap[i].name, name) == 0) | |
242 | return i; | |
243 | ||
244 | return -1; | |
245 | } | |
246 | ||
ca3bf3bd | 247 | /* Returns the name of a register. */ |
ca3bf3bd | 248 | static const char * |
d93859e2 | 249 | xtensa_register_name (struct gdbarch *gdbarch, int regnum) |
ca3bf3bd DJ |
250 | { |
251 | /* Return the name stored in the register map. */ | |
d93859e2 UW |
252 | if (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch) |
253 | + gdbarch_num_pseudo_regs (gdbarch)) | |
254 | return gdbarch_tdep (gdbarch)->regmap[regnum].name; | |
ca3bf3bd | 255 | |
ca3bf3bd DJ |
256 | internal_error (__FILE__, __LINE__, _("invalid register %d"), regnum); |
257 | return 0; | |
258 | } | |
259 | ||
ca3bf3bd DJ |
260 | /* Return the type of a register. Create a new type, if necessary. */ |
261 | ||
ca3bf3bd DJ |
262 | static struct type * |
263 | xtensa_register_type (struct gdbarch *gdbarch, int regnum) | |
264 | { | |
df4df182 UW |
265 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
266 | ||
ca3bf3bd | 267 | /* Return signed integer for ARx and Ax registers. */ |
df4df182 UW |
268 | if ((regnum >= tdep->ar_base |
269 | && regnum < tdep->ar_base + tdep->num_aregs) | |
270 | || (regnum >= tdep->a0_base | |
271 | && regnum < tdep->a0_base + 16)) | |
0dfff4cb | 272 | return builtin_type (gdbarch)->builtin_int; |
ca3bf3bd | 273 | |
6b50c0b0 | 274 | if (regnum == gdbarch_pc_regnum (gdbarch) |
df4df182 | 275 | || regnum == tdep->a0_base + 1) |
fde6c819 | 276 | return builtin_type (gdbarch)->builtin_data_ptr; |
ca3bf3bd DJ |
277 | |
278 | /* Return the stored type for all other registers. */ | |
6b50c0b0 UW |
279 | else if (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch) |
280 | + gdbarch_num_pseudo_regs (gdbarch)) | |
ca3bf3bd | 281 | { |
df4df182 | 282 | xtensa_register_t* reg = &tdep->regmap[regnum]; |
ca3bf3bd | 283 | |
bdb4c075 | 284 | /* Set ctype for this register (only the first time). */ |
ca3bf3bd DJ |
285 | |
286 | if (reg->ctype == 0) | |
287 | { | |
288 | struct ctype_cache *tp; | |
289 | int size = reg->byte_size; | |
290 | ||
bdb4c075 MG |
291 | /* We always use the memory representation, |
292 | even if the register width is smaller. */ | |
ca3bf3bd DJ |
293 | switch (size) |
294 | { | |
295 | case 1: | |
df4df182 | 296 | reg->ctype = builtin_type (gdbarch)->builtin_uint8; |
ca3bf3bd DJ |
297 | break; |
298 | ||
299 | case 2: | |
df4df182 | 300 | reg->ctype = builtin_type (gdbarch)->builtin_uint16; |
ca3bf3bd DJ |
301 | break; |
302 | ||
303 | case 4: | |
df4df182 | 304 | reg->ctype = builtin_type (gdbarch)->builtin_uint32; |
ca3bf3bd DJ |
305 | break; |
306 | ||
307 | case 8: | |
df4df182 | 308 | reg->ctype = builtin_type (gdbarch)->builtin_uint64; |
ca3bf3bd DJ |
309 | break; |
310 | ||
311 | case 16: | |
df4df182 | 312 | reg->ctype = builtin_type (gdbarch)->builtin_uint128; |
ca3bf3bd DJ |
313 | break; |
314 | ||
315 | default: | |
df4df182 | 316 | for (tp = tdep->type_entries; tp != NULL; tp = tp->next) |
ca3bf3bd DJ |
317 | if (tp->size == size) |
318 | break; | |
319 | ||
320 | if (tp == NULL) | |
321 | { | |
1448a0a2 | 322 | char *name = xstrprintf ("int%d", size * 8); |
8d749320 SM |
323 | |
324 | tp = XNEW (struct ctype_cache); | |
df4df182 UW |
325 | tp->next = tdep->type_entries; |
326 | tdep->type_entries = tp; | |
ca3bf3bd | 327 | tp->size = size; |
e9bb382b | 328 | tp->virtual_type |
1448a0a2 PM |
329 | = arch_integer_type (gdbarch, size * 8, 1, name); |
330 | xfree (name); | |
ca3bf3bd DJ |
331 | } |
332 | ||
333 | reg->ctype = tp->virtual_type; | |
334 | } | |
335 | } | |
336 | return reg->ctype; | |
337 | } | |
338 | ||
ca3bf3bd DJ |
339 | internal_error (__FILE__, __LINE__, _("invalid register number %d"), regnum); |
340 | return 0; | |
341 | } | |
342 | ||
343 | ||
bdb4c075 | 344 | /* Return the 'local' register number for stubs, dwarf2, etc. |
ca3bf3bd DJ |
345 | The debugging information enumerates registers starting from 0 for A0 |
346 | to n for An. So, we only have to add the base number for A0. */ | |
347 | ||
348 | static int | |
d3f73121 | 349 | xtensa_reg_to_regnum (struct gdbarch *gdbarch, int regnum) |
ca3bf3bd DJ |
350 | { |
351 | int i; | |
352 | ||
353 | if (regnum >= 0 && regnum < 16) | |
d3f73121 | 354 | return gdbarch_tdep (gdbarch)->a0_base + regnum; |
ca3bf3bd | 355 | |
f57d151a | 356 | for (i = 0; |
d3f73121 | 357 | i < gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch); |
f57d151a | 358 | i++) |
d3f73121 | 359 | if (regnum == gdbarch_tdep (gdbarch)->regmap[i].target_number) |
ca3bf3bd DJ |
360 | return i; |
361 | ||
0fde2c53 | 362 | return -1; |
ca3bf3bd DJ |
363 | } |
364 | ||
365 | ||
bdb4c075 MG |
366 | /* Write the bits of a masked register to the various registers. |
367 | Only the masked areas of these registers are modified; the other | |
368 | fields are untouched. The size of masked registers is always less | |
369 | than or equal to 32 bits. */ | |
ca3bf3bd DJ |
370 | |
371 | static void | |
9c9acae0 UW |
372 | xtensa_register_write_masked (struct regcache *regcache, |
373 | xtensa_register_t *reg, const gdb_byte *buffer) | |
ca3bf3bd | 374 | { |
0dd5cbc5 | 375 | unsigned int value[(XTENSA_MAX_REGISTER_SIZE + 3) / 4]; |
ca3bf3bd DJ |
376 | const xtensa_mask_t *mask = reg->mask; |
377 | ||
378 | int shift = 0; /* Shift for next mask (mod 32). */ | |
379 | int start, size; /* Start bit and size of current mask. */ | |
380 | ||
381 | unsigned int *ptr = value; | |
382 | unsigned int regval, m, mem = 0; | |
383 | ||
384 | int bytesize = reg->byte_size; | |
385 | int bitsize = bytesize * 8; | |
386 | int i, r; | |
387 | ||
388 | DEBUGTRACE ("xtensa_register_write_masked ()\n"); | |
389 | ||
390 | /* Copy the masked register to host byte-order. */ | |
ac7936df | 391 | if (gdbarch_byte_order (regcache->arch ()) == BFD_ENDIAN_BIG) |
ca3bf3bd DJ |
392 | for (i = 0; i < bytesize; i++) |
393 | { | |
394 | mem >>= 8; | |
395 | mem |= (buffer[bytesize - i - 1] << 24); | |
396 | if ((i & 3) == 3) | |
397 | *ptr++ = mem; | |
398 | } | |
399 | else | |
400 | for (i = 0; i < bytesize; i++) | |
401 | { | |
402 | mem >>= 8; | |
403 | mem |= (buffer[i] << 24); | |
404 | if ((i & 3) == 3) | |
405 | *ptr++ = mem; | |
406 | } | |
407 | ||
408 | /* We might have to shift the final value: | |
409 | bytesize & 3 == 0 -> nothing to do, we use the full 32 bits, | |
410 | bytesize & 3 == x -> shift (4-x) * 8. */ | |
411 | ||
412 | *ptr = mem >> (((0 - bytesize) & 3) * 8); | |
413 | ptr = value; | |
414 | mem = *ptr; | |
415 | ||
416 | /* Write the bits to the masked areas of the other registers. */ | |
417 | for (i = 0; i < mask->count; i++) | |
418 | { | |
419 | start = mask->mask[i].bit_start; | |
420 | size = mask->mask[i].bit_size; | |
421 | regval = mem >> shift; | |
422 | ||
423 | if ((shift += size) > bitsize) | |
424 | error (_("size of all masks is larger than the register")); | |
425 | ||
426 | if (shift >= 32) | |
427 | { | |
428 | mem = *(++ptr); | |
429 | shift -= 32; | |
430 | bitsize -= 32; | |
431 | ||
432 | if (shift > 0) | |
433 | regval |= mem << (size - shift); | |
434 | } | |
435 | ||
436 | /* Make sure we have a valid register. */ | |
437 | r = mask->mask[i].reg_num; | |
438 | if (r >= 0 && size > 0) | |
439 | { | |
440 | /* Don't overwrite the unmasked areas. */ | |
9c9acae0 UW |
441 | ULONGEST old_val; |
442 | regcache_cooked_read_unsigned (regcache, r, &old_val); | |
ca3bf3bd DJ |
443 | m = 0xffffffff >> (32 - size) << start; |
444 | regval <<= start; | |
9c9acae0 UW |
445 | regval = (regval & m) | (old_val & ~m); |
446 | regcache_cooked_write_unsigned (regcache, r, regval); | |
ca3bf3bd DJ |
447 | } |
448 | } | |
449 | } | |
450 | ||
451 | ||
bdb4c075 MG |
452 | /* Read a tie state or mapped registers. Read the masked areas |
453 | of the registers and assemble them into a single value. */ | |
ca3bf3bd | 454 | |
05d1431c | 455 | static enum register_status |
849d0ba8 | 456 | xtensa_register_read_masked (readable_regcache *regcache, |
9c9acae0 | 457 | xtensa_register_t *reg, gdb_byte *buffer) |
ca3bf3bd | 458 | { |
0dd5cbc5 | 459 | unsigned int value[(XTENSA_MAX_REGISTER_SIZE + 3) / 4]; |
ca3bf3bd DJ |
460 | const xtensa_mask_t *mask = reg->mask; |
461 | ||
462 | int shift = 0; | |
463 | int start, size; | |
464 | ||
465 | unsigned int *ptr = value; | |
466 | unsigned int regval, mem = 0; | |
467 | ||
468 | int bytesize = reg->byte_size; | |
469 | int bitsize = bytesize * 8; | |
470 | int i; | |
471 | ||
472 | DEBUGTRACE ("xtensa_register_read_masked (reg \"%s\", ...)\n", | |
473 | reg->name == 0 ? "" : reg->name); | |
474 | ||
475 | /* Assemble the register from the masked areas of other registers. */ | |
476 | for (i = 0; i < mask->count; i++) | |
477 | { | |
478 | int r = mask->mask[i].reg_num; | |
9c9acae0 UW |
479 | if (r >= 0) |
480 | { | |
05d1431c | 481 | enum register_status status; |
9c9acae0 | 482 | ULONGEST val; |
05d1431c | 483 | |
11f57cb6 | 484 | status = regcache->cooked_read (r, &val); |
05d1431c PA |
485 | if (status != REG_VALID) |
486 | return status; | |
9c9acae0 UW |
487 | regval = (unsigned int) val; |
488 | } | |
489 | else | |
490 | regval = 0; | |
491 | ||
ca3bf3bd DJ |
492 | start = mask->mask[i].bit_start; |
493 | size = mask->mask[i].bit_size; | |
494 | ||
495 | regval >>= start; | |
496 | ||
497 | if (size < 32) | |
498 | regval &= (0xffffffff >> (32 - size)); | |
499 | ||
500 | mem |= regval << shift; | |
501 | ||
502 | if ((shift += size) > bitsize) | |
503 | error (_("size of all masks is larger than the register")); | |
504 | ||
505 | if (shift >= 32) | |
506 | { | |
507 | *ptr++ = mem; | |
508 | bitsize -= 32; | |
509 | shift -= 32; | |
510 | ||
511 | if (shift == 0) | |
512 | mem = 0; | |
513 | else | |
514 | mem = regval >> (size - shift); | |
515 | } | |
516 | } | |
517 | ||
518 | if (shift > 0) | |
519 | *ptr = mem; | |
520 | ||
521 | /* Copy value to target byte order. */ | |
522 | ptr = value; | |
523 | mem = *ptr; | |
524 | ||
ac7936df | 525 | if (gdbarch_byte_order (regcache->arch ()) == BFD_ENDIAN_BIG) |
ca3bf3bd DJ |
526 | for (i = 0; i < bytesize; i++) |
527 | { | |
528 | if ((i & 3) == 0) | |
529 | mem = *ptr++; | |
530 | buffer[bytesize - i - 1] = mem & 0xff; | |
531 | mem >>= 8; | |
532 | } | |
533 | else | |
534 | for (i = 0; i < bytesize; i++) | |
535 | { | |
536 | if ((i & 3) == 0) | |
537 | mem = *ptr++; | |
538 | buffer[i] = mem & 0xff; | |
539 | mem >>= 8; | |
540 | } | |
05d1431c PA |
541 | |
542 | return REG_VALID; | |
ca3bf3bd DJ |
543 | } |
544 | ||
545 | ||
546 | /* Read pseudo registers. */ | |
547 | ||
05d1431c | 548 | static enum register_status |
ca3bf3bd | 549 | xtensa_pseudo_register_read (struct gdbarch *gdbarch, |
849d0ba8 | 550 | readable_regcache *regcache, |
ca3bf3bd DJ |
551 | int regnum, |
552 | gdb_byte *buffer) | |
553 | { | |
554 | DEBUGTRACE ("xtensa_pseudo_register_read (... regnum = %d (%s) ...)\n", | |
d93859e2 | 555 | regnum, xtensa_register_name (gdbarch, regnum)); |
ca3bf3bd | 556 | |
bdb4c075 | 557 | /* Read aliases a0..a15, if this is a Windowed ABI. */ |
6b50c0b0 | 558 | if (gdbarch_tdep (gdbarch)->isa_use_windowed_registers |
94a0e877 | 559 | && (regnum >= gdbarch_tdep (gdbarch)->a0_base) |
6b50c0b0 | 560 | && (regnum <= gdbarch_tdep (gdbarch)->a0_base + 15)) |
ca3bf3bd | 561 | { |
c185f580 | 562 | ULONGEST value; |
05d1431c | 563 | enum register_status status; |
ca3bf3bd | 564 | |
03f50fc8 YQ |
565 | status = regcache->raw_read (gdbarch_tdep (gdbarch)->wb_regnum, |
566 | &value); | |
05d1431c PA |
567 | if (status != REG_VALID) |
568 | return status; | |
c185f580 | 569 | regnum = arreg_number (gdbarch, regnum, value); |
ca3bf3bd DJ |
570 | } |
571 | ||
bdb4c075 | 572 | /* We can always read non-pseudo registers. */ |
6b50c0b0 | 573 | if (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)) |
03f50fc8 | 574 | return regcache->raw_read (regnum, buffer); |
94a0e877 MG |
575 | |
576 | /* We have to find out how to deal with priveleged registers. | |
577 | Let's treat them as pseudo-registers, but we cannot read/write them. */ | |
578 | ||
0d0bf81a MF |
579 | else if (gdbarch_tdep (gdbarch)->call_abi == CallAbiCall0Only |
580 | || regnum < gdbarch_tdep (gdbarch)->a0_base) | |
94a0e877 MG |
581 | { |
582 | buffer[0] = (gdb_byte)0; | |
583 | buffer[1] = (gdb_byte)0; | |
584 | buffer[2] = (gdb_byte)0; | |
585 | buffer[3] = (gdb_byte)0; | |
05d1431c | 586 | return REG_VALID; |
94a0e877 | 587 | } |
ca3bf3bd | 588 | /* Pseudo registers. */ |
f57d151a | 589 | else if (regnum >= 0 |
6b50c0b0 UW |
590 | && regnum < gdbarch_num_regs (gdbarch) |
591 | + gdbarch_num_pseudo_regs (gdbarch)) | |
ca3bf3bd | 592 | { |
6b50c0b0 | 593 | xtensa_register_t *reg = &gdbarch_tdep (gdbarch)->regmap[regnum]; |
ca3bf3bd | 594 | xtensa_register_type_t type = reg->type; |
6b50c0b0 | 595 | int flags = gdbarch_tdep (gdbarch)->target_flags; |
ca3bf3bd | 596 | |
bdb4c075 | 597 | /* We cannot read Unknown or Unmapped registers. */ |
ca3bf3bd DJ |
598 | if (type == xtRegisterTypeUnmapped || type == xtRegisterTypeUnknown) |
599 | { | |
600 | if ((flags & xtTargetFlagsNonVisibleRegs) == 0) | |
601 | { | |
602 | warning (_("cannot read register %s"), | |
d93859e2 | 603 | xtensa_register_name (gdbarch, regnum)); |
05d1431c | 604 | return REG_VALID; |
ca3bf3bd DJ |
605 | } |
606 | } | |
607 | ||
608 | /* Some targets cannot read TIE register files. */ | |
609 | else if (type == xtRegisterTypeTieRegfile) | |
610 | { | |
611 | /* Use 'fetch' to get register? */ | |
612 | if (flags & xtTargetFlagsUseFetchStore) | |
613 | { | |
614 | warning (_("cannot read register")); | |
05d1431c | 615 | return REG_VALID; |
ca3bf3bd DJ |
616 | } |
617 | ||
618 | /* On some targets (esp. simulators), we can always read the reg. */ | |
619 | else if ((flags & xtTargetFlagsNonVisibleRegs) == 0) | |
620 | { | |
621 | warning (_("cannot read register")); | |
05d1431c | 622 | return REG_VALID; |
ca3bf3bd DJ |
623 | } |
624 | } | |
625 | ||
626 | /* We can always read mapped registers. */ | |
627 | else if (type == xtRegisterTypeMapped || type == xtRegisterTypeTieState) | |
05d1431c | 628 | return xtensa_register_read_masked (regcache, reg, buffer); |
ca3bf3bd DJ |
629 | |
630 | /* Assume that we can read the register. */ | |
03f50fc8 | 631 | return regcache->raw_read (regnum, buffer); |
ca3bf3bd | 632 | } |
ca3bf3bd DJ |
633 | else |
634 | internal_error (__FILE__, __LINE__, | |
635 | _("invalid register number %d"), regnum); | |
636 | } | |
637 | ||
638 | ||
639 | /* Write pseudo registers. */ | |
640 | ||
641 | static void | |
642 | xtensa_pseudo_register_write (struct gdbarch *gdbarch, | |
643 | struct regcache *regcache, | |
644 | int regnum, | |
645 | const gdb_byte *buffer) | |
646 | { | |
647 | DEBUGTRACE ("xtensa_pseudo_register_write (... regnum = %d (%s) ...)\n", | |
d93859e2 | 648 | regnum, xtensa_register_name (gdbarch, regnum)); |
ca3bf3bd | 649 | |
bdb4c075 | 650 | /* Renumber register, if aliase a0..a15 on Windowed ABI. */ |
6b50c0b0 | 651 | if (gdbarch_tdep (gdbarch)->isa_use_windowed_registers |
94a0e877 | 652 | && (regnum >= gdbarch_tdep (gdbarch)->a0_base) |
6b50c0b0 | 653 | && (regnum <= gdbarch_tdep (gdbarch)->a0_base + 15)) |
ca3bf3bd | 654 | { |
c185f580 AH |
655 | ULONGEST value; |
656 | regcache_raw_read_unsigned (regcache, | |
657 | gdbarch_tdep (gdbarch)->wb_regnum, &value); | |
658 | regnum = arreg_number (gdbarch, regnum, value); | |
ca3bf3bd DJ |
659 | } |
660 | ||
661 | /* We can always write 'core' registers. | |
662 | Note: We might have converted Ax->ARy. */ | |
6b50c0b0 | 663 | if (regnum >= 0 && regnum < gdbarch_num_regs (gdbarch)) |
ca3bf3bd DJ |
664 | regcache_raw_write (regcache, regnum, buffer); |
665 | ||
94a0e877 MG |
666 | /* We have to find out how to deal with priveleged registers. |
667 | Let's treat them as pseudo-registers, but we cannot read/write them. */ | |
668 | ||
669 | else if (regnum < gdbarch_tdep (gdbarch)->a0_base) | |
670 | { | |
671 | return; | |
672 | } | |
ca3bf3bd | 673 | /* Pseudo registers. */ |
f57d151a | 674 | else if (regnum >= 0 |
6b50c0b0 UW |
675 | && regnum < gdbarch_num_regs (gdbarch) |
676 | + gdbarch_num_pseudo_regs (gdbarch)) | |
ca3bf3bd | 677 | { |
6b50c0b0 | 678 | xtensa_register_t *reg = &gdbarch_tdep (gdbarch)->regmap[regnum]; |
ca3bf3bd | 679 | xtensa_register_type_t type = reg->type; |
6b50c0b0 | 680 | int flags = gdbarch_tdep (gdbarch)->target_flags; |
ca3bf3bd | 681 | |
bdb4c075 MG |
682 | /* On most targets, we cannot write registers |
683 | of type "Unknown" or "Unmapped". */ | |
ca3bf3bd DJ |
684 | if (type == xtRegisterTypeUnmapped || type == xtRegisterTypeUnknown) |
685 | { | |
686 | if ((flags & xtTargetFlagsNonVisibleRegs) == 0) | |
687 | { | |
688 | warning (_("cannot write register %s"), | |
d93859e2 | 689 | xtensa_register_name (gdbarch, regnum)); |
ca3bf3bd DJ |
690 | return; |
691 | } | |
692 | } | |
693 | ||
694 | /* Some targets cannot read TIE register files. */ | |
695 | else if (type == xtRegisterTypeTieRegfile) | |
696 | { | |
697 | /* Use 'store' to get register? */ | |
698 | if (flags & xtTargetFlagsUseFetchStore) | |
699 | { | |
700 | warning (_("cannot write register")); | |
701 | return; | |
702 | } | |
703 | ||
704 | /* On some targets (esp. simulators), we can always write | |
705 | the register. */ | |
ca3bf3bd DJ |
706 | else if ((flags & xtTargetFlagsNonVisibleRegs) == 0) |
707 | { | |
708 | warning (_("cannot write register")); | |
709 | return; | |
710 | } | |
711 | } | |
712 | ||
713 | /* We can always write mapped registers. */ | |
714 | else if (type == xtRegisterTypeMapped || type == xtRegisterTypeTieState) | |
715 | { | |
9c9acae0 | 716 | xtensa_register_write_masked (regcache, reg, buffer); |
ca3bf3bd DJ |
717 | return; |
718 | } | |
719 | ||
720 | /* Assume that we can write the register. */ | |
721 | regcache_raw_write (regcache, regnum, buffer); | |
722 | } | |
ca3bf3bd DJ |
723 | else |
724 | internal_error (__FILE__, __LINE__, | |
725 | _("invalid register number %d"), regnum); | |
726 | } | |
727 | ||
ca3bf3bd DJ |
728 | static struct reggroup *xtensa_ar_reggroup; |
729 | static struct reggroup *xtensa_user_reggroup; | |
730 | static struct reggroup *xtensa_vectra_reggroup; | |
7b871568 | 731 | static struct reggroup *xtensa_cp[XTENSA_MAX_COPROCESSOR]; |
ca3bf3bd DJ |
732 | |
733 | static void | |
734 | xtensa_init_reggroups (void) | |
735 | { | |
98689b25 | 736 | int i; |
98689b25 | 737 | |
ca3bf3bd DJ |
738 | xtensa_ar_reggroup = reggroup_new ("ar", USER_REGGROUP); |
739 | xtensa_user_reggroup = reggroup_new ("user", USER_REGGROUP); | |
740 | xtensa_vectra_reggroup = reggroup_new ("vectra", USER_REGGROUP); | |
ca3bf3bd | 741 | |
98689b25 | 742 | for (i = 0; i < XTENSA_MAX_COPROCESSOR; i++) |
9c3cc999 | 743 | xtensa_cp[i] = reggroup_new (xstrprintf ("cp%d", i), USER_REGGROUP); |
7b871568 | 744 | } |
ca3bf3bd DJ |
745 | |
746 | static void | |
747 | xtensa_add_reggroups (struct gdbarch *gdbarch) | |
748 | { | |
7b871568 MG |
749 | int i; |
750 | ||
751 | /* Predefined groups. */ | |
ca3bf3bd DJ |
752 | reggroup_add (gdbarch, all_reggroup); |
753 | reggroup_add (gdbarch, save_reggroup); | |
754 | reggroup_add (gdbarch, restore_reggroup); | |
755 | reggroup_add (gdbarch, system_reggroup); | |
7b871568 MG |
756 | reggroup_add (gdbarch, vector_reggroup); |
757 | reggroup_add (gdbarch, general_reggroup); | |
758 | reggroup_add (gdbarch, float_reggroup); | |
759 | ||
760 | /* Xtensa-specific groups. */ | |
761 | reggroup_add (gdbarch, xtensa_ar_reggroup); | |
762 | reggroup_add (gdbarch, xtensa_user_reggroup); | |
763 | reggroup_add (gdbarch, xtensa_vectra_reggroup); | |
ca3bf3bd | 764 | |
7b871568 MG |
765 | for (i = 0; i < XTENSA_MAX_COPROCESSOR; i++) |
766 | reggroup_add (gdbarch, xtensa_cp[i]); | |
ca3bf3bd DJ |
767 | } |
768 | ||
7b871568 MG |
769 | static int |
770 | xtensa_coprocessor_register_group (struct reggroup *group) | |
771 | { | |
772 | int i; | |
773 | ||
774 | for (i = 0; i < XTENSA_MAX_COPROCESSOR; i++) | |
775 | if (group == xtensa_cp[i]) | |
776 | return i; | |
777 | ||
778 | return -1; | |
779 | } | |
ca3bf3bd DJ |
780 | |
781 | #define SAVE_REST_FLAGS (XTENSA_REGISTER_FLAGS_READABLE \ | |
782 | | XTENSA_REGISTER_FLAGS_WRITABLE \ | |
783 | | XTENSA_REGISTER_FLAGS_VOLATILE) | |
784 | ||
785 | #define SAVE_REST_VALID (XTENSA_REGISTER_FLAGS_READABLE \ | |
786 | | XTENSA_REGISTER_FLAGS_WRITABLE) | |
787 | ||
788 | static int | |
789 | xtensa_register_reggroup_p (struct gdbarch *gdbarch, | |
790 | int regnum, | |
791 | struct reggroup *group) | |
792 | { | |
6b50c0b0 | 793 | xtensa_register_t* reg = &gdbarch_tdep (gdbarch)->regmap[regnum]; |
ca3bf3bd DJ |
794 | xtensa_register_type_t type = reg->type; |
795 | xtensa_register_group_t rg = reg->group; | |
7b871568 | 796 | int cp_number; |
ca3bf3bd | 797 | |
57041825 MG |
798 | if (group == save_reggroup) |
799 | /* Every single register should be included into the list of registers | |
800 | to be watched for changes while using -data-list-changed-registers. */ | |
801 | return 1; | |
802 | ||
ca3bf3bd DJ |
803 | /* First, skip registers that are not visible to this target |
804 | (unknown and unmapped registers when not using ISS). */ | |
805 | ||
806 | if (type == xtRegisterTypeUnmapped || type == xtRegisterTypeUnknown) | |
807 | return 0; | |
808 | if (group == all_reggroup) | |
809 | return 1; | |
810 | if (group == xtensa_ar_reggroup) | |
811 | return rg & xtRegisterGroupAddrReg; | |
812 | if (group == xtensa_user_reggroup) | |
813 | return rg & xtRegisterGroupUser; | |
814 | if (group == float_reggroup) | |
815 | return rg & xtRegisterGroupFloat; | |
816 | if (group == general_reggroup) | |
817 | return rg & xtRegisterGroupGeneral; | |
ca3bf3bd DJ |
818 | if (group == system_reggroup) |
819 | return rg & xtRegisterGroupState; | |
820 | if (group == vector_reggroup || group == xtensa_vectra_reggroup) | |
821 | return rg & xtRegisterGroupVectra; | |
57041825 | 822 | if (group == restore_reggroup) |
6b50c0b0 | 823 | return (regnum < gdbarch_num_regs (gdbarch) |
ca3bf3bd | 824 | && (reg->flags & SAVE_REST_FLAGS) == SAVE_REST_VALID); |
1448a0a2 PM |
825 | cp_number = xtensa_coprocessor_register_group (group); |
826 | if (cp_number >= 0) | |
7b871568 | 827 | return rg & (xtRegisterGroupCP0 << cp_number); |
ca3bf3bd DJ |
828 | else |
829 | return 1; | |
830 | } | |
831 | ||
832 | ||
ca3bf3bd DJ |
833 | /* Supply register REGNUM from the buffer specified by GREGS and LEN |
834 | in the general-purpose register set REGSET to register cache | |
bdb4c075 | 835 | REGCACHE. If REGNUM is -1 do this for all registers in REGSET. */ |
ca3bf3bd DJ |
836 | |
837 | static void | |
838 | xtensa_supply_gregset (const struct regset *regset, | |
839 | struct regcache *rc, | |
840 | int regnum, | |
841 | const void *gregs, | |
842 | size_t len) | |
843 | { | |
19ba03f4 | 844 | const xtensa_elf_gregset_t *regs = (const xtensa_elf_gregset_t *) gregs; |
ac7936df | 845 | struct gdbarch *gdbarch = rc->arch (); |
ca3bf3bd DJ |
846 | int i; |
847 | ||
cce7e648 | 848 | DEBUGTRACE ("xtensa_supply_gregset (..., regnum==%d, ...)\n", regnum); |
ca3bf3bd | 849 | |
6b50c0b0 UW |
850 | if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1) |
851 | regcache_raw_supply (rc, gdbarch_pc_regnum (gdbarch), (char *) ®s->pc); | |
852 | if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1) | |
853 | regcache_raw_supply (rc, gdbarch_ps_regnum (gdbarch), (char *) ®s->ps); | |
854 | if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1) | |
855 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->wb_regnum, | |
304fe255 | 856 | (char *) ®s->windowbase); |
6b50c0b0 UW |
857 | if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1) |
858 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->ws_regnum, | |
304fe255 | 859 | (char *) ®s->windowstart); |
6b50c0b0 UW |
860 | if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1) |
861 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->lbeg_regnum, | |
304fe255 | 862 | (char *) ®s->lbeg); |
6b50c0b0 UW |
863 | if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1) |
864 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->lend_regnum, | |
304fe255 | 865 | (char *) ®s->lend); |
6b50c0b0 UW |
866 | if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1) |
867 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->lcount_regnum, | |
304fe255 | 868 | (char *) ®s->lcount); |
6b50c0b0 UW |
869 | if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1) |
870 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->sar_regnum, | |
304fe255 | 871 | (char *) ®s->sar); |
6b50c0b0 UW |
872 | if (regnum >=gdbarch_tdep (gdbarch)->ar_base |
873 | && regnum < gdbarch_tdep (gdbarch)->ar_base | |
874 | + gdbarch_tdep (gdbarch)->num_aregs) | |
304fe255 UW |
875 | regcache_raw_supply (rc, regnum, |
876 | (char *) ®s->ar[regnum - gdbarch_tdep | |
6b50c0b0 | 877 | (gdbarch)->ar_base]); |
ca3bf3bd DJ |
878 | else if (regnum == -1) |
879 | { | |
6b50c0b0 UW |
880 | for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i) |
881 | regcache_raw_supply (rc, gdbarch_tdep (gdbarch)->ar_base + i, | |
304fe255 | 882 | (char *) ®s->ar[i]); |
ca3bf3bd DJ |
883 | } |
884 | } | |
885 | ||
886 | ||
887 | /* Xtensa register set. */ | |
888 | ||
889 | static struct regset | |
890 | xtensa_gregset = | |
891 | { | |
892 | NULL, | |
893 | xtensa_supply_gregset | |
894 | }; | |
895 | ||
896 | ||
97094034 | 897 | /* Iterate over supported core file register note sections. */ |
ca3bf3bd | 898 | |
97094034 AA |
899 | static void |
900 | xtensa_iterate_over_regset_sections (struct gdbarch *gdbarch, | |
901 | iterate_over_regset_sections_cb *cb, | |
902 | void *cb_data, | |
903 | const struct regcache *regcache) | |
ca3bf3bd | 904 | { |
97094034 | 905 | DEBUGTRACE ("xtensa_iterate_over_regset_sections\n"); |
ca3bf3bd | 906 | |
97094034 AA |
907 | cb (".reg", sizeof (xtensa_elf_gregset_t), &xtensa_gregset, |
908 | NULL, cb_data); | |
ca3bf3bd DJ |
909 | } |
910 | ||
911 | ||
bdb4c075 | 912 | /* Handling frames. */ |
ca3bf3bd | 913 | |
bdb4c075 MG |
914 | /* Number of registers to save in case of Windowed ABI. */ |
915 | #define XTENSA_NUM_SAVED_AREGS 12 | |
ca3bf3bd | 916 | |
bdb4c075 MG |
917 | /* Frame cache part for Windowed ABI. */ |
918 | typedef struct xtensa_windowed_frame_cache | |
ca3bf3bd | 919 | { |
ee967b5f MG |
920 | int wb; /* WINDOWBASE of the previous frame. */ |
921 | int callsize; /* Call size of this frame. */ | |
08b9c608 MG |
922 | int ws; /* WINDOWSTART of the previous frame. It keeps track of |
923 | life windows only. If there is no bit set for the | |
924 | window, that means it had been already spilled | |
925 | because of window overflow. */ | |
926 | ||
927 | /* Addresses of spilled A-registers. | |
928 | AREGS[i] == -1, if corresponding AR is alive. */ | |
ca3bf3bd | 929 | CORE_ADDR aregs[XTENSA_NUM_SAVED_AREGS]; |
bdb4c075 MG |
930 | } xtensa_windowed_frame_cache_t; |
931 | ||
932 | /* Call0 ABI Definitions. */ | |
933 | ||
581e13c1 MS |
934 | #define C0_MAXOPDS 3 /* Maximum number of operands for prologue |
935 | analysis. */ | |
bdb4c075 MG |
936 | #define C0_CLESV 12 /* Callee-saved registers are here and up. */ |
937 | #define C0_SP 1 /* Register used as SP. */ | |
938 | #define C0_FP 15 /* Register used as FP. */ | |
939 | #define C0_RA 0 /* Register used as return address. */ | |
940 | #define C0_ARGS 2 /* Register used as first arg/retval. */ | |
941 | #define C0_NARGS 6 /* Number of A-regs for args/retvals. */ | |
942 | ||
943 | /* Each element of xtensa_call0_frame_cache.c0_rt[] describes for each | |
944 | A-register where the current content of the reg came from (in terms | |
945 | of an original reg and a constant). Negative values of c0_rt[n].fp_reg | |
946 | mean that the orignal content of the register was saved to the stack. | |
947 | c0_rt[n].fr.ofs is NOT the offset from the frame base because we don't | |
948 | know where SP will end up until the entire prologue has been analyzed. */ | |
949 | ||
950 | #define C0_CONST -1 /* fr_reg value if register contains a constant. */ | |
951 | #define C0_INEXP -2 /* fr_reg value if inexpressible as reg + offset. */ | |
952 | #define C0_NOSTK -1 /* to_stk value if register has not been stored. */ | |
953 | ||
954 | extern xtensa_isa xtensa_default_isa; | |
955 | ||
956 | typedef struct xtensa_c0reg | |
957 | { | |
dbab50de MG |
958 | int fr_reg; /* original register from which register content |
959 | is derived, or C0_CONST, or C0_INEXP. */ | |
960 | int fr_ofs; /* constant offset from reg, or immediate value. */ | |
961 | int to_stk; /* offset from original SP to register (4-byte aligned), | |
962 | or C0_NOSTK if register has not been saved. */ | |
bdb4c075 MG |
963 | } xtensa_c0reg_t; |
964 | ||
bdb4c075 MG |
965 | /* Frame cache part for Call0 ABI. */ |
966 | typedef struct xtensa_call0_frame_cache | |
967 | { | |
dbab50de MG |
968 | int c0_frmsz; /* Stack frame size. */ |
969 | int c0_hasfp; /* Current frame uses frame pointer. */ | |
970 | int fp_regnum; /* A-register used as FP. */ | |
971 | int c0_fp; /* Actual value of frame pointer. */ | |
972 | int c0_fpalign; /* Dinamic adjustment for the stack | |
973 | pointer. It's an AND mask. Zero, | |
974 | if alignment was not adjusted. */ | |
975 | int c0_old_sp; /* In case of dynamic adjustment, it is | |
976 | a register holding unaligned sp. | |
977 | C0_INEXP, when undefined. */ | |
978 | int c0_sp_ofs; /* If "c0_old_sp" was spilled it's a | |
979 | stack offset. C0_NOSTK otherwise. */ | |
980 | ||
981 | xtensa_c0reg_t c0_rt[C0_NREGS]; /* Register tracking information. */ | |
bdb4c075 MG |
982 | } xtensa_call0_frame_cache_t; |
983 | ||
984 | typedef struct xtensa_frame_cache | |
985 | { | |
ee967b5f | 986 | CORE_ADDR base; /* Stack pointer of this frame. */ |
08b9c608 MG |
987 | CORE_ADDR pc; /* PC of this frame at the function entry point. */ |
988 | CORE_ADDR ra; /* The raw return address of this frame. */ | |
989 | CORE_ADDR ps; /* The PS register of the previous (older) frame. */ | |
990 | CORE_ADDR prev_sp; /* Stack Pointer of the previous (older) frame. */ | |
bdb4c075 MG |
991 | int call0; /* It's a call0 framework (else windowed). */ |
992 | union | |
993 | { | |
994 | xtensa_windowed_frame_cache_t wd; /* call0 == false. */ | |
995 | xtensa_call0_frame_cache_t c0; /* call0 == true. */ | |
996 | }; | |
ca3bf3bd DJ |
997 | } xtensa_frame_cache_t; |
998 | ||
999 | ||
1000 | static struct xtensa_frame_cache * | |
bdb4c075 | 1001 | xtensa_alloc_frame_cache (int windowed) |
ca3bf3bd DJ |
1002 | { |
1003 | xtensa_frame_cache_t *cache; | |
1004 | int i; | |
1005 | ||
1006 | DEBUGTRACE ("xtensa_alloc_frame_cache ()\n"); | |
1007 | ||
1008 | cache = FRAME_OBSTACK_ZALLOC (xtensa_frame_cache_t); | |
1009 | ||
1010 | cache->base = 0; | |
1011 | cache->pc = 0; | |
1012 | cache->ra = 0; | |
ca3bf3bd | 1013 | cache->ps = 0; |
ca3bf3bd | 1014 | cache->prev_sp = 0; |
bdb4c075 MG |
1015 | cache->call0 = !windowed; |
1016 | if (cache->call0) | |
1017 | { | |
1018 | cache->c0.c0_frmsz = -1; | |
1019 | cache->c0.c0_hasfp = 0; | |
1020 | cache->c0.fp_regnum = -1; | |
1021 | cache->c0.c0_fp = -1; | |
dbab50de MG |
1022 | cache->c0.c0_fpalign = 0; |
1023 | cache->c0.c0_old_sp = C0_INEXP; | |
1024 | cache->c0.c0_sp_ofs = C0_NOSTK; | |
ca3bf3bd | 1025 | |
bdb4c075 MG |
1026 | for (i = 0; i < C0_NREGS; i++) |
1027 | { | |
1028 | cache->c0.c0_rt[i].fr_reg = i; | |
1029 | cache->c0.c0_rt[i].fr_ofs = 0; | |
1030 | cache->c0.c0_rt[i].to_stk = C0_NOSTK; | |
1031 | } | |
1032 | } | |
1033 | else | |
1034 | { | |
1035 | cache->wd.wb = 0; | |
ee967b5f | 1036 | cache->wd.ws = 0; |
bdb4c075 | 1037 | cache->wd.callsize = -1; |
ca3bf3bd | 1038 | |
bdb4c075 MG |
1039 | for (i = 0; i < XTENSA_NUM_SAVED_AREGS; i++) |
1040 | cache->wd.aregs[i] = -1; | |
1041 | } | |
ca3bf3bd DJ |
1042 | return cache; |
1043 | } | |
1044 | ||
1045 | ||
1046 | static CORE_ADDR | |
1047 | xtensa_frame_align (struct gdbarch *gdbarch, CORE_ADDR address) | |
1048 | { | |
1049 | return address & ~15; | |
1050 | } | |
1051 | ||
1052 | ||
1053 | static CORE_ADDR | |
1054 | xtensa_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) | |
1055 | { | |
ff7a4c00 | 1056 | gdb_byte buf[8]; |
0dfff4cb | 1057 | CORE_ADDR pc; |
ca3bf3bd | 1058 | |
a74ce742 PM |
1059 | DEBUGTRACE ("xtensa_unwind_pc (next_frame = %s)\n", |
1060 | host_address_to_string (next_frame)); | |
ca3bf3bd | 1061 | |
6b50c0b0 | 1062 | frame_unwind_register (next_frame, gdbarch_pc_regnum (gdbarch), buf); |
0dfff4cb | 1063 | pc = extract_typed_address (buf, builtin_type (gdbarch)->builtin_func_ptr); |
ca3bf3bd | 1064 | |
0dfff4cb | 1065 | DEBUGINFO ("[xtensa_unwind_pc] pc = 0x%08x\n", (unsigned int) pc); |
ca3bf3bd | 1066 | |
0dfff4cb | 1067 | return pc; |
ca3bf3bd DJ |
1068 | } |
1069 | ||
1070 | ||
1071 | static struct frame_id | |
5142f611 | 1072 | xtensa_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame) |
ca3bf3bd DJ |
1073 | { |
1074 | CORE_ADDR pc, fp; | |
ca3bf3bd | 1075 | |
5142f611 | 1076 | /* THIS-FRAME is a dummy frame. Return a frame ID of that frame. */ |
ca3bf3bd | 1077 | |
5142f611 MG |
1078 | pc = get_frame_pc (this_frame); |
1079 | fp = get_frame_register_unsigned | |
1080 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + 1); | |
ca3bf3bd DJ |
1081 | |
1082 | /* Make dummy frame ID unique by adding a constant. */ | |
bdb4c075 | 1083 | return frame_id_build (fp + SP_ALIGNMENT, pc); |
ca3bf3bd DJ |
1084 | } |
1085 | ||
08b9c608 MG |
1086 | /* Returns true, if instruction to execute next is unique to Xtensa Window |
1087 | Interrupt Handlers. It can only be one of L32E, S32E, RFWO, or RFWU. */ | |
1088 | ||
1089 | static int | |
1090 | xtensa_window_interrupt_insn (struct gdbarch *gdbarch, CORE_ADDR pc) | |
1091 | { | |
1092 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1093 | unsigned int insn = read_memory_integer (pc, 4, byte_order); | |
1094 | unsigned int code; | |
1095 | ||
1096 | if (byte_order == BFD_ENDIAN_BIG) | |
1097 | { | |
1098 | /* Check, if this is L32E or S32E. */ | |
1099 | code = insn & 0xf000ff00; | |
1100 | if ((code == 0x00009000) || (code == 0x00009400)) | |
1101 | return 1; | |
1102 | /* Check, if this is RFWU or RFWO. */ | |
1103 | code = insn & 0xffffff00; | |
1104 | return ((code == 0x00430000) || (code == 0x00530000)); | |
1105 | } | |
1106 | else | |
1107 | { | |
1108 | /* Check, if this is L32E or S32E. */ | |
1109 | code = insn & 0x00ff000f; | |
1110 | if ((code == 0x090000) || (code == 0x490000)) | |
1111 | return 1; | |
1112 | /* Check, if this is RFWU or RFWO. */ | |
1113 | code = insn & 0x00ffffff; | |
1114 | return ((code == 0x00003400) || (code == 0x00003500)); | |
1115 | } | |
1116 | } | |
1117 | ||
ee967b5f MG |
1118 | /* Returns the best guess about which register is a frame pointer |
1119 | for the function containing CURRENT_PC. */ | |
1120 | ||
d4709618 MG |
1121 | #define XTENSA_ISA_BSZ 32 /* Instruction buffer size. */ |
1122 | #define XTENSA_ISA_BADPC ((CORE_ADDR)0) /* Bad PC value. */ | |
ee967b5f MG |
1123 | |
1124 | static unsigned int | |
1125 | xtensa_scan_prologue (struct gdbarch *gdbarch, CORE_ADDR current_pc) | |
1126 | { | |
1127 | #define RETURN_FP goto done | |
1128 | ||
1129 | unsigned int fp_regnum = gdbarch_tdep (gdbarch)->a0_base + 1; | |
1130 | CORE_ADDR start_addr; | |
1131 | xtensa_isa isa; | |
1132 | xtensa_insnbuf ins, slot; | |
948f8e3d | 1133 | gdb_byte ibuf[XTENSA_ISA_BSZ]; |
ee967b5f MG |
1134 | CORE_ADDR ia, bt, ba; |
1135 | xtensa_format ifmt; | |
1136 | int ilen, islots, is; | |
1137 | xtensa_opcode opc; | |
1138 | const char *opcname; | |
1139 | ||
1140 | find_pc_partial_function (current_pc, NULL, &start_addr, NULL); | |
1141 | if (start_addr == 0) | |
1142 | return fp_regnum; | |
1143 | ||
ee967b5f MG |
1144 | isa = xtensa_default_isa; |
1145 | gdb_assert (XTENSA_ISA_BSZ >= xtensa_isa_maxlength (isa)); | |
1146 | ins = xtensa_insnbuf_alloc (isa); | |
1147 | slot = xtensa_insnbuf_alloc (isa); | |
1148 | ba = 0; | |
1149 | ||
1150 | for (ia = start_addr, bt = ia; ia < current_pc ; ia += ilen) | |
1151 | { | |
1152 | if (ia + xtensa_isa_maxlength (isa) > bt) | |
1153 | { | |
1154 | ba = ia; | |
1155 | bt = (ba + XTENSA_ISA_BSZ) < current_pc | |
1156 | ? ba + XTENSA_ISA_BSZ : current_pc; | |
d4709618 MG |
1157 | if (target_read_memory (ba, ibuf, bt - ba) != 0) |
1158 | RETURN_FP; | |
ee967b5f MG |
1159 | } |
1160 | ||
1161 | xtensa_insnbuf_from_chars (isa, ins, &ibuf[ia-ba], 0); | |
1162 | ifmt = xtensa_format_decode (isa, ins); | |
1163 | if (ifmt == XTENSA_UNDEFINED) | |
1164 | RETURN_FP; | |
1165 | ilen = xtensa_format_length (isa, ifmt); | |
1166 | if (ilen == XTENSA_UNDEFINED) | |
1167 | RETURN_FP; | |
1168 | islots = xtensa_format_num_slots (isa, ifmt); | |
1169 | if (islots == XTENSA_UNDEFINED) | |
1170 | RETURN_FP; | |
1171 | ||
1172 | for (is = 0; is < islots; ++is) | |
1173 | { | |
1174 | if (xtensa_format_get_slot (isa, ifmt, is, ins, slot)) | |
1175 | RETURN_FP; | |
1176 | ||
1177 | opc = xtensa_opcode_decode (isa, ifmt, is, slot); | |
1178 | if (opc == XTENSA_UNDEFINED) | |
1179 | RETURN_FP; | |
1180 | ||
1181 | opcname = xtensa_opcode_name (isa, opc); | |
1182 | ||
1183 | if (strcasecmp (opcname, "mov.n") == 0 | |
1184 | || strcasecmp (opcname, "or") == 0) | |
1185 | { | |
1186 | unsigned int register_operand; | |
1187 | ||
1188 | /* Possible candidate for setting frame pointer | |
581e13c1 | 1189 | from A1. This is what we are looking for. */ |
ee967b5f MG |
1190 | |
1191 | if (xtensa_operand_get_field (isa, opc, 1, ifmt, | |
1192 | is, slot, ®ister_operand) != 0) | |
1193 | RETURN_FP; | |
1194 | if (xtensa_operand_decode (isa, opc, 1, ®ister_operand) != 0) | |
1195 | RETURN_FP; | |
1196 | if (register_operand == 1) /* Mov{.n} FP A1. */ | |
1197 | { | |
1198 | if (xtensa_operand_get_field (isa, opc, 0, ifmt, is, slot, | |
1199 | ®ister_operand) != 0) | |
1200 | RETURN_FP; | |
1201 | if (xtensa_operand_decode (isa, opc, 0, | |
1202 | ®ister_operand) != 0) | |
1203 | RETURN_FP; | |
1204 | ||
581e13c1 MS |
1205 | fp_regnum |
1206 | = gdbarch_tdep (gdbarch)->a0_base + register_operand; | |
ee967b5f MG |
1207 | RETURN_FP; |
1208 | } | |
1209 | } | |
1210 | ||
1211 | if ( | |
1212 | /* We have problems decoding the memory. */ | |
1213 | opcname == NULL | |
1214 | || strcasecmp (opcname, "ill") == 0 | |
1215 | || strcasecmp (opcname, "ill.n") == 0 | |
1216 | /* Hit planted breakpoint. */ | |
1217 | || strcasecmp (opcname, "break") == 0 | |
1218 | || strcasecmp (opcname, "break.n") == 0 | |
1219 | /* Flow control instructions finish prologue. */ | |
1220 | || xtensa_opcode_is_branch (isa, opc) > 0 | |
1221 | || xtensa_opcode_is_jump (isa, opc) > 0 | |
1222 | || xtensa_opcode_is_loop (isa, opc) > 0 | |
1223 | || xtensa_opcode_is_call (isa, opc) > 0 | |
1224 | || strcasecmp (opcname, "simcall") == 0 | |
1225 | || strcasecmp (opcname, "syscall") == 0) | |
1226 | /* Can not continue analysis. */ | |
1227 | RETURN_FP; | |
1228 | } | |
1229 | } | |
1230 | done: | |
1231 | xtensa_insnbuf_free(isa, slot); | |
1232 | xtensa_insnbuf_free(isa, ins); | |
1233 | return fp_regnum; | |
1234 | } | |
1235 | ||
bdb4c075 MG |
1236 | /* The key values to identify the frame using "cache" are |
1237 | ||
ee967b5f | 1238 | cache->base = SP (or best guess about FP) of this frame; |
bdb4c075 | 1239 | cache->pc = entry-PC (entry point of the frame function); |
581e13c1 | 1240 | cache->prev_sp = SP of the previous frame. */ |
bdb4c075 MG |
1241 | |
1242 | static void | |
5142f611 | 1243 | call0_frame_cache (struct frame_info *this_frame, |
dbab50de | 1244 | xtensa_frame_cache_t *cache, CORE_ADDR pc); |
ca3bf3bd | 1245 | |
08b9c608 MG |
1246 | static void |
1247 | xtensa_window_interrupt_frame_cache (struct frame_info *this_frame, | |
1248 | xtensa_frame_cache_t *cache, | |
1249 | CORE_ADDR pc); | |
1250 | ||
ca3bf3bd | 1251 | static struct xtensa_frame_cache * |
5142f611 | 1252 | xtensa_frame_cache (struct frame_info *this_frame, void **this_cache) |
ca3bf3bd DJ |
1253 | { |
1254 | xtensa_frame_cache_t *cache; | |
ca3bf3bd | 1255 | CORE_ADDR ra, wb, ws, pc, sp, ps; |
5142f611 | 1256 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
e17a4113 | 1257 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ee967b5f | 1258 | unsigned int fp_regnum; |
98689b25 | 1259 | int windowed, ps_regnum; |
ca3bf3bd | 1260 | |
ca3bf3bd | 1261 | if (*this_cache) |
19ba03f4 | 1262 | return (struct xtensa_frame_cache *) *this_cache; |
ca3bf3bd | 1263 | |
98689b25 MG |
1264 | pc = get_frame_register_unsigned (this_frame, gdbarch_pc_regnum (gdbarch)); |
1265 | ps_regnum = gdbarch_ps_regnum (gdbarch); | |
68d6df83 MG |
1266 | ps = (ps_regnum >= 0 |
1267 | ? get_frame_register_unsigned (this_frame, ps_regnum) : TX_PS); | |
98689b25 MG |
1268 | |
1269 | windowed = windowing_enabled (gdbarch, ps); | |
bdb4c075 | 1270 | |
ca3bf3bd | 1271 | /* Get pristine xtensa-frame. */ |
bdb4c075 | 1272 | cache = xtensa_alloc_frame_cache (windowed); |
ca3bf3bd DJ |
1273 | *this_cache = cache; |
1274 | ||
bdb4c075 | 1275 | if (windowed) |
ca3bf3bd | 1276 | { |
a08b52b5 | 1277 | LONGEST op1; |
98689b25 | 1278 | |
bdb4c075 | 1279 | /* Get WINDOWBASE, WINDOWSTART, and PS registers. */ |
5142f611 MG |
1280 | wb = get_frame_register_unsigned (this_frame, |
1281 | gdbarch_tdep (gdbarch)->wb_regnum); | |
1282 | ws = get_frame_register_unsigned (this_frame, | |
1283 | gdbarch_tdep (gdbarch)->ws_regnum); | |
ca3bf3bd | 1284 | |
a08b52b5 MF |
1285 | if (safe_read_memory_integer (pc, 1, byte_order, &op1) |
1286 | && XTENSA_IS_ENTRY (gdbarch, op1)) | |
ca3bf3bd | 1287 | { |
bdb4c075 | 1288 | int callinc = CALLINC (ps); |
5142f611 MG |
1289 | ra = get_frame_register_unsigned |
1290 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + callinc * 4); | |
bdb4c075 MG |
1291 | |
1292 | /* ENTRY hasn't been executed yet, therefore callsize is still 0. */ | |
1293 | cache->wd.callsize = 0; | |
1294 | cache->wd.wb = wb; | |
1295 | cache->wd.ws = ws; | |
5142f611 MG |
1296 | cache->prev_sp = get_frame_register_unsigned |
1297 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + 1); | |
ee967b5f MG |
1298 | |
1299 | /* This only can be the outermost frame since we are | |
1300 | just about to execute ENTRY. SP hasn't been set yet. | |
1301 | We can assume any frame size, because it does not | |
1302 | matter, and, let's fake frame base in cache. */ | |
98689b25 | 1303 | cache->base = cache->prev_sp - 16; |
ee967b5f MG |
1304 | |
1305 | cache->pc = pc; | |
1306 | cache->ra = (cache->pc & 0xc0000000) | (ra & 0x3fffffff); | |
1307 | cache->ps = (ps & ~PS_CALLINC_MASK) | |
1308 | | ((WINSIZE(ra)/4) << PS_CALLINC_SHIFT); | |
1309 | ||
1310 | return cache; | |
bdb4c075 MG |
1311 | } |
1312 | else | |
1313 | { | |
ee967b5f | 1314 | fp_regnum = xtensa_scan_prologue (gdbarch, pc); |
5142f611 MG |
1315 | ra = get_frame_register_unsigned (this_frame, |
1316 | gdbarch_tdep (gdbarch)->a0_base); | |
bdb4c075 | 1317 | cache->wd.callsize = WINSIZE (ra); |
304fe255 | 1318 | cache->wd.wb = (wb - cache->wd.callsize / 4) |
6b50c0b0 | 1319 | & (gdbarch_tdep (gdbarch)->num_aregs / 4 - 1); |
bdb4c075 | 1320 | cache->wd.ws = ws & ~(1 << wb); |
ca3bf3bd | 1321 | |
5142f611 | 1322 | cache->pc = get_frame_func (this_frame); |
f6402f18 | 1323 | cache->ra = (pc & 0xc0000000) | (ra & 0x3fffffff); |
ee967b5f MG |
1324 | cache->ps = (ps & ~PS_CALLINC_MASK) |
1325 | | ((WINSIZE(ra)/4) << PS_CALLINC_SHIFT); | |
1326 | } | |
bdb4c075 MG |
1327 | |
1328 | if (cache->wd.ws == 0) | |
ca3bf3bd | 1329 | { |
bdb4c075 | 1330 | int i; |
ca3bf3bd | 1331 | |
bdb4c075 | 1332 | /* Set A0...A3. */ |
5142f611 MG |
1333 | sp = get_frame_register_unsigned |
1334 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + 1) - 16; | |
bdb4c075 MG |
1335 | |
1336 | for (i = 0; i < 4; i++, sp += 4) | |
1337 | { | |
1338 | cache->wd.aregs[i] = sp; | |
1339 | } | |
ca3bf3bd | 1340 | |
bdb4c075 | 1341 | if (cache->wd.callsize > 4) |
ca3bf3bd | 1342 | { |
bdb4c075 | 1343 | /* Set A4...A7/A11. */ |
ee967b5f MG |
1344 | /* Get the SP of the frame previous to the previous one. |
1345 | To achieve this, we have to dereference SP twice. */ | |
e17a4113 UW |
1346 | sp = (CORE_ADDR) read_memory_integer (sp - 12, 4, byte_order); |
1347 | sp = (CORE_ADDR) read_memory_integer (sp - 12, 4, byte_order); | |
bdb4c075 MG |
1348 | sp -= cache->wd.callsize * 4; |
1349 | ||
ee967b5f | 1350 | for ( i = 4; i < cache->wd.callsize; i++, sp += 4) |
bdb4c075 MG |
1351 | { |
1352 | cache->wd.aregs[i] = sp; | |
1353 | } | |
ca3bf3bd DJ |
1354 | } |
1355 | } | |
ca3bf3bd | 1356 | |
bdb4c075 | 1357 | if ((cache->prev_sp == 0) && ( ra != 0 )) |
08b9c608 MG |
1358 | /* If RA is equal to 0 this frame is an outermost frame. Leave |
1359 | cache->prev_sp unchanged marking the boundary of the frame stack. */ | |
ca3bf3bd | 1360 | { |
ee967b5f | 1361 | if ((cache->wd.ws & (1 << cache->wd.wb)) == 0) |
bdb4c075 MG |
1362 | { |
1363 | /* Register window overflow already happened. | |
1364 | We can read caller's SP from the proper spill loction. */ | |
5142f611 MG |
1365 | sp = get_frame_register_unsigned |
1366 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + 1); | |
e17a4113 | 1367 | cache->prev_sp = read_memory_integer (sp - 12, 4, byte_order); |
bdb4c075 MG |
1368 | } |
1369 | else | |
1370 | { | |
1371 | /* Read caller's frame SP directly from the previous window. */ | |
ee967b5f | 1372 | int regnum = arreg_number |
91d8eb23 | 1373 | (gdbarch, gdbarch_tdep (gdbarch)->a0_base + 1, |
304fe255 | 1374 | cache->wd.wb); |
ca3bf3bd | 1375 | |
08b9c608 | 1376 | cache->prev_sp = xtensa_read_register (regnum); |
bdb4c075 | 1377 | } |
ca3bf3bd DJ |
1378 | } |
1379 | } | |
08b9c608 MG |
1380 | else if (xtensa_window_interrupt_insn (gdbarch, pc)) |
1381 | { | |
1382 | /* Execution stopped inside Xtensa Window Interrupt Handler. */ | |
1383 | ||
1384 | xtensa_window_interrupt_frame_cache (this_frame, cache, pc); | |
1385 | /* Everything was set already, including cache->base. */ | |
1386 | return cache; | |
1387 | } | |
bdb4c075 MG |
1388 | else /* Call0 framework. */ |
1389 | { | |
dbab50de | 1390 | call0_frame_cache (this_frame, cache, pc); |
ee967b5f | 1391 | fp_regnum = cache->c0.fp_regnum; |
bdb4c075 | 1392 | } |
ca3bf3bd | 1393 | |
5142f611 | 1394 | cache->base = get_frame_register_unsigned (this_frame, fp_regnum); |
ca3bf3bd | 1395 | |
ca3bf3bd DJ |
1396 | return cache; |
1397 | } | |
1398 | ||
dbab50de MG |
1399 | static int xtensa_session_once_reported = 1; |
1400 | ||
1401 | /* Report a problem with prologue analysis while doing backtracing. | |
1402 | But, do it only once to avoid annoyng repeated messages. */ | |
1403 | ||
4e6ca6d5 MG |
1404 | static void |
1405 | warning_once (void) | |
dbab50de MG |
1406 | { |
1407 | if (xtensa_session_once_reported == 0) | |
1408 | warning (_("\ | |
1409 | \nUnrecognised function prologue. Stack trace cannot be resolved. \ | |
1410 | This message will not be repeated in this session.\n")); | |
1411 | ||
1412 | xtensa_session_once_reported = 1; | |
1413 | } | |
1414 | ||
1415 | ||
ca3bf3bd | 1416 | static void |
5142f611 | 1417 | xtensa_frame_this_id (struct frame_info *this_frame, |
ca3bf3bd DJ |
1418 | void **this_cache, |
1419 | struct frame_id *this_id) | |
1420 | { | |
1421 | struct xtensa_frame_cache *cache = | |
5142f611 | 1422 | xtensa_frame_cache (this_frame, this_cache); |
ca3bf3bd DJ |
1423 | |
1424 | if (cache->prev_sp == 0) | |
1425 | return; | |
1426 | ||
5142f611 | 1427 | (*this_id) = frame_id_build (cache->prev_sp, cache->pc); |
bdb4c075 | 1428 | } |
ca3bf3bd | 1429 | |
5142f611 MG |
1430 | static struct value * |
1431 | xtensa_frame_prev_register (struct frame_info *this_frame, | |
ca3bf3bd | 1432 | void **this_cache, |
5142f611 | 1433 | int regnum) |
ca3bf3bd | 1434 | { |
5142f611 MG |
1435 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
1436 | struct xtensa_frame_cache *cache; | |
1437 | ULONGEST saved_reg = 0; | |
ca3bf3bd DJ |
1438 | int done = 1; |
1439 | ||
5142f611 MG |
1440 | if (*this_cache == NULL) |
1441 | *this_cache = xtensa_frame_cache (this_frame, this_cache); | |
19ba03f4 | 1442 | cache = (struct xtensa_frame_cache *) *this_cache; |
ca3bf3bd | 1443 | |
6b50c0b0 | 1444 | if (regnum ==gdbarch_pc_regnum (gdbarch)) |
bdb4c075 | 1445 | saved_reg = cache->ra; |
6b50c0b0 | 1446 | else if (regnum == gdbarch_tdep (gdbarch)->a0_base + 1) |
bdb4c075 MG |
1447 | saved_reg = cache->prev_sp; |
1448 | else if (!cache->call0) | |
ca3bf3bd | 1449 | { |
6b50c0b0 | 1450 | if (regnum == gdbarch_tdep (gdbarch)->ws_regnum) |
ee967b5f | 1451 | saved_reg = cache->wd.ws; |
6b50c0b0 | 1452 | else if (regnum == gdbarch_tdep (gdbarch)->wb_regnum) |
bdb4c075 | 1453 | saved_reg = cache->wd.wb; |
6b50c0b0 | 1454 | else if (regnum == gdbarch_ps_regnum (gdbarch)) |
bdb4c075 | 1455 | saved_reg = cache->ps; |
ca3bf3bd | 1456 | else |
bdb4c075 | 1457 | done = 0; |
ca3bf3bd | 1458 | } |
ca3bf3bd DJ |
1459 | else |
1460 | done = 0; | |
1461 | ||
1462 | if (done) | |
5142f611 | 1463 | return frame_unwind_got_constant (this_frame, regnum, saved_reg); |
ca3bf3bd | 1464 | |
bdb4c075 | 1465 | if (!cache->call0) /* Windowed ABI. */ |
ca3bf3bd | 1466 | { |
ee967b5f MG |
1467 | /* Convert A-register numbers to AR-register numbers, |
1468 | if we deal with A-register. */ | |
94a0e877 | 1469 | if (regnum >= gdbarch_tdep (gdbarch)->a0_base |
6b50c0b0 | 1470 | && regnum <= gdbarch_tdep (gdbarch)->a0_base + 15) |
ee967b5f | 1471 | regnum = arreg_number (gdbarch, regnum, cache->wd.wb); |
ca3bf3bd | 1472 | |
ee967b5f | 1473 | /* Check, if we deal with AR-register saved on stack. */ |
6b50c0b0 UW |
1474 | if (regnum >= gdbarch_tdep (gdbarch)->ar_base |
1475 | && regnum <= (gdbarch_tdep (gdbarch)->ar_base | |
1476 | + gdbarch_tdep (gdbarch)->num_aregs)) | |
bdb4c075 | 1477 | { |
ee967b5f | 1478 | int areg = areg_number (gdbarch, regnum, cache->wd.wb); |
ca3bf3bd | 1479 | |
bdb4c075 MG |
1480 | if (areg >= 0 |
1481 | && areg < XTENSA_NUM_SAVED_AREGS | |
1482 | && cache->wd.aregs[areg] != -1) | |
5142f611 MG |
1483 | return frame_unwind_got_memory (this_frame, regnum, |
1484 | cache->wd.aregs[areg]); | |
ca3bf3bd DJ |
1485 | } |
1486 | } | |
bdb4c075 MG |
1487 | else /* Call0 ABI. */ |
1488 | { | |
6b50c0b0 UW |
1489 | int reg = (regnum >= gdbarch_tdep (gdbarch)->ar_base |
1490 | && regnum <= (gdbarch_tdep (gdbarch)->ar_base | |
304fe255 | 1491 | + C0_NREGS)) |
6b50c0b0 | 1492 | ? regnum - gdbarch_tdep (gdbarch)->ar_base : regnum; |
ca3bf3bd | 1493 | |
bdb4c075 MG |
1494 | if (reg < C0_NREGS) |
1495 | { | |
1496 | CORE_ADDR spe; | |
1497 | int stkofs; | |
1498 | ||
1499 | /* If register was saved in the prologue, retrieve it. */ | |
1500 | stkofs = cache->c0.c0_rt[reg].to_stk; | |
1501 | if (stkofs != C0_NOSTK) | |
1502 | { | |
1503 | /* Determine SP on entry based on FP. */ | |
1504 | spe = cache->c0.c0_fp | |
1505 | - cache->c0.c0_rt[cache->c0.fp_regnum].fr_ofs; | |
5142f611 | 1506 | |
581e13c1 MS |
1507 | return frame_unwind_got_memory (this_frame, regnum, |
1508 | spe + stkofs); | |
bdb4c075 MG |
1509 | } |
1510 | } | |
1511 | } | |
1512 | ||
1513 | /* All other registers have been either saved to | |
1514 | the stack or are still alive in the processor. */ | |
ca3bf3bd | 1515 | |
5142f611 | 1516 | return frame_unwind_got_register (this_frame, regnum, regnum); |
ca3bf3bd DJ |
1517 | } |
1518 | ||
1519 | ||
1520 | static const struct frame_unwind | |
5142f611 | 1521 | xtensa_unwind = |
ca3bf3bd DJ |
1522 | { |
1523 | NORMAL_FRAME, | |
8fbca658 | 1524 | default_frame_unwind_stop_reason, |
ca3bf3bd | 1525 | xtensa_frame_this_id, |
5142f611 MG |
1526 | xtensa_frame_prev_register, |
1527 | NULL, | |
1528 | default_frame_sniffer | |
ca3bf3bd DJ |
1529 | }; |
1530 | ||
ca3bf3bd | 1531 | static CORE_ADDR |
5142f611 | 1532 | xtensa_frame_base_address (struct frame_info *this_frame, void **this_cache) |
ca3bf3bd DJ |
1533 | { |
1534 | struct xtensa_frame_cache *cache = | |
5142f611 | 1535 | xtensa_frame_cache (this_frame, this_cache); |
ca3bf3bd DJ |
1536 | |
1537 | return cache->base; | |
1538 | } | |
1539 | ||
1540 | static const struct frame_base | |
1541 | xtensa_frame_base = | |
1542 | { | |
5142f611 | 1543 | &xtensa_unwind, |
ca3bf3bd DJ |
1544 | xtensa_frame_base_address, |
1545 | xtensa_frame_base_address, | |
1546 | xtensa_frame_base_address | |
1547 | }; | |
1548 | ||
1549 | ||
1550 | static void | |
1551 | xtensa_extract_return_value (struct type *type, | |
1552 | struct regcache *regcache, | |
1553 | void *dst) | |
1554 | { | |
ac7936df | 1555 | struct gdbarch *gdbarch = regcache->arch (); |
19ba03f4 | 1556 | bfd_byte *valbuf = (bfd_byte *) dst; |
ca3bf3bd DJ |
1557 | int len = TYPE_LENGTH (type); |
1558 | ULONGEST pc, wb; | |
1559 | int callsize, areg; | |
1560 | int offset = 0; | |
1561 | ||
1562 | DEBUGTRACE ("xtensa_extract_return_value (...)\n"); | |
1563 | ||
1564 | gdb_assert(len > 0); | |
1565 | ||
6b50c0b0 | 1566 | if (gdbarch_tdep (gdbarch)->call_abi != CallAbiCall0Only) |
bdb4c075 MG |
1567 | { |
1568 | /* First, we have to find the caller window in the register file. */ | |
6b50c0b0 | 1569 | regcache_raw_read_unsigned (regcache, gdbarch_pc_regnum (gdbarch), &pc); |
91d8eb23 | 1570 | callsize = extract_call_winsize (gdbarch, pc); |
ca3bf3bd | 1571 | |
bdb4c075 MG |
1572 | /* On Xtensa, we can return up to 4 words (or 2 for call12). */ |
1573 | if (len > (callsize > 8 ? 8 : 16)) | |
1574 | internal_error (__FILE__, __LINE__, | |
581e13c1 MS |
1575 | _("cannot extract return value of %d bytes long"), |
1576 | len); | |
ca3bf3bd | 1577 | |
bdb4c075 MG |
1578 | /* Get the register offset of the return |
1579 | register (A2) in the caller window. */ | |
304fe255 | 1580 | regcache_raw_read_unsigned |
6b50c0b0 | 1581 | (regcache, gdbarch_tdep (gdbarch)->wb_regnum, &wb); |
ee967b5f | 1582 | areg = arreg_number (gdbarch, |
91d8eb23 | 1583 | gdbarch_tdep (gdbarch)->a0_base + 2 + callsize, wb); |
bdb4c075 MG |
1584 | } |
1585 | else | |
1586 | { | |
1587 | /* No windowing hardware - Call0 ABI. */ | |
94a0e877 | 1588 | areg = gdbarch_tdep (gdbarch)->a0_base + C0_ARGS; |
bdb4c075 | 1589 | } |
ca3bf3bd DJ |
1590 | |
1591 | DEBUGINFO ("[xtensa_extract_return_value] areg %d len %d\n", areg, len); | |
1592 | ||
6b50c0b0 | 1593 | if (len < 4 && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
ca3bf3bd DJ |
1594 | offset = 4 - len; |
1595 | ||
1596 | for (; len > 0; len -= 4, areg++, valbuf += 4) | |
1597 | { | |
1598 | if (len < 4) | |
1599 | regcache_raw_read_part (regcache, areg, offset, len, valbuf); | |
1600 | else | |
1601 | regcache_raw_read (regcache, areg, valbuf); | |
1602 | } | |
1603 | } | |
1604 | ||
1605 | ||
1606 | static void | |
1607 | xtensa_store_return_value (struct type *type, | |
1608 | struct regcache *regcache, | |
1609 | const void *dst) | |
1610 | { | |
ac7936df | 1611 | struct gdbarch *gdbarch = regcache->arch (); |
19ba03f4 | 1612 | const bfd_byte *valbuf = (const bfd_byte *) dst; |
ca3bf3bd DJ |
1613 | unsigned int areg; |
1614 | ULONGEST pc, wb; | |
1615 | int callsize; | |
1616 | int len = TYPE_LENGTH (type); | |
1617 | int offset = 0; | |
1618 | ||
1619 | DEBUGTRACE ("xtensa_store_return_value (...)\n"); | |
1620 | ||
6b50c0b0 | 1621 | if (gdbarch_tdep (gdbarch)->call_abi != CallAbiCall0Only) |
bdb4c075 | 1622 | { |
6b50c0b0 UW |
1623 | regcache_raw_read_unsigned |
1624 | (regcache, gdbarch_tdep (gdbarch)->wb_regnum, &wb); | |
1625 | regcache_raw_read_unsigned (regcache, gdbarch_pc_regnum (gdbarch), &pc); | |
91d8eb23 | 1626 | callsize = extract_call_winsize (gdbarch, pc); |
ca3bf3bd | 1627 | |
bdb4c075 MG |
1628 | if (len > (callsize > 8 ? 8 : 16)) |
1629 | internal_error (__FILE__, __LINE__, | |
1630 | _("unimplemented for this length: %d"), | |
1631 | TYPE_LENGTH (type)); | |
ee967b5f MG |
1632 | areg = arreg_number (gdbarch, |
1633 | gdbarch_tdep (gdbarch)->a0_base + 2 + callsize, wb); | |
ca3bf3bd | 1634 | |
bdb4c075 | 1635 | DEBUGTRACE ("[xtensa_store_return_value] callsize %d wb %d\n", |
ca3bf3bd | 1636 | callsize, (int) wb); |
bdb4c075 MG |
1637 | } |
1638 | else | |
1639 | { | |
94a0e877 | 1640 | areg = gdbarch_tdep (gdbarch)->a0_base + C0_ARGS; |
bdb4c075 | 1641 | } |
ca3bf3bd | 1642 | |
6b50c0b0 | 1643 | if (len < 4 && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
ca3bf3bd DJ |
1644 | offset = 4 - len; |
1645 | ||
ca3bf3bd DJ |
1646 | for (; len > 0; len -= 4, areg++, valbuf += 4) |
1647 | { | |
1648 | if (len < 4) | |
1649 | regcache_raw_write_part (regcache, areg, offset, len, valbuf); | |
1650 | else | |
1651 | regcache_raw_write (regcache, areg, valbuf); | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | ||
bdb4c075 | 1656 | static enum return_value_convention |
ca3bf3bd | 1657 | xtensa_return_value (struct gdbarch *gdbarch, |
6a3a010b | 1658 | struct value *function, |
ca3bf3bd DJ |
1659 | struct type *valtype, |
1660 | struct regcache *regcache, | |
1661 | gdb_byte *readbuf, | |
1662 | const gdb_byte *writebuf) | |
1663 | { | |
bdb4c075 | 1664 | /* Structures up to 16 bytes are returned in registers. */ |
ca3bf3bd DJ |
1665 | |
1666 | int struct_return = ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT | |
1667 | || TYPE_CODE (valtype) == TYPE_CODE_UNION | |
1668 | || TYPE_CODE (valtype) == TYPE_CODE_ARRAY) | |
1669 | && TYPE_LENGTH (valtype) > 16); | |
1670 | ||
1671 | if (struct_return) | |
1672 | return RETURN_VALUE_STRUCT_CONVENTION; | |
1673 | ||
1674 | DEBUGTRACE ("xtensa_return_value(...)\n"); | |
1675 | ||
1676 | if (writebuf != NULL) | |
1677 | { | |
1678 | xtensa_store_return_value (valtype, regcache, writebuf); | |
1679 | } | |
1680 | ||
1681 | if (readbuf != NULL) | |
1682 | { | |
1683 | gdb_assert (!struct_return); | |
1684 | xtensa_extract_return_value (valtype, regcache, readbuf); | |
1685 | } | |
1686 | return RETURN_VALUE_REGISTER_CONVENTION; | |
1687 | } | |
1688 | ||
1689 | ||
1690 | /* DUMMY FRAME */ | |
1691 | ||
1692 | static CORE_ADDR | |
1693 | xtensa_push_dummy_call (struct gdbarch *gdbarch, | |
1694 | struct value *function, | |
1695 | struct regcache *regcache, | |
1696 | CORE_ADDR bp_addr, | |
1697 | int nargs, | |
1698 | struct value **args, | |
1699 | CORE_ADDR sp, | |
1700 | int struct_return, | |
1701 | CORE_ADDR struct_addr) | |
1702 | { | |
e17a4113 | 1703 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
ca3bf3bd DJ |
1704 | int i; |
1705 | int size, onstack_size; | |
ff7a4c00 | 1706 | gdb_byte *buf = (gdb_byte *) alloca (16); |
ca3bf3bd DJ |
1707 | CORE_ADDR ra, ps; |
1708 | struct argument_info | |
1709 | { | |
1710 | const bfd_byte *contents; | |
1711 | int length; | |
1712 | int onstack; /* onstack == 0 => in reg */ | |
1713 | int align; /* alignment */ | |
1714 | union | |
1715 | { | |
581e13c1 MS |
1716 | int offset; /* stack offset if on stack. */ |
1717 | int regno; /* regno if in register. */ | |
ca3bf3bd DJ |
1718 | } u; |
1719 | }; | |
1720 | ||
1721 | struct argument_info *arg_info = | |
1722 | (struct argument_info *) alloca (nargs * sizeof (struct argument_info)); | |
1723 | ||
1724 | CORE_ADDR osp = sp; | |
1725 | ||
1726 | DEBUGTRACE ("xtensa_push_dummy_call (...)\n"); | |
1727 | ||
1728 | if (xtensa_debug_level > 3) | |
1729 | { | |
1730 | int i; | |
1731 | DEBUGINFO ("[xtensa_push_dummy_call] nargs = %d\n", nargs); | |
1732 | DEBUGINFO ("[xtensa_push_dummy_call] sp=0x%x, struct_return=%d, " | |
1733 | "struct_addr=0x%x\n", | |
1734 | (int) sp, (int) struct_return, (int) struct_addr); | |
1735 | ||
1736 | for (i = 0; i < nargs; i++) | |
1737 | { | |
1738 | struct value *arg = args[i]; | |
1739 | struct type *arg_type = check_typedef (value_type (arg)); | |
3329c4b5 PM |
1740 | fprintf_unfiltered (gdb_stdlog, "%2d: %s %3d ", i, |
1741 | host_address_to_string (arg), | |
1742 | TYPE_LENGTH (arg_type)); | |
ca3bf3bd DJ |
1743 | switch (TYPE_CODE (arg_type)) |
1744 | { | |
1745 | case TYPE_CODE_INT: | |
1746 | fprintf_unfiltered (gdb_stdlog, "int"); | |
1747 | break; | |
1748 | case TYPE_CODE_STRUCT: | |
1749 | fprintf_unfiltered (gdb_stdlog, "struct"); | |
1750 | break; | |
1751 | default: | |
1752 | fprintf_unfiltered (gdb_stdlog, "%3d", TYPE_CODE (arg_type)); | |
1753 | break; | |
1754 | } | |
3329c4b5 PM |
1755 | fprintf_unfiltered (gdb_stdlog, " %s\n", |
1756 | host_address_to_string (value_contents (arg))); | |
ca3bf3bd DJ |
1757 | } |
1758 | } | |
1759 | ||
1760 | /* First loop: collect information. | |
1761 | Cast into type_long. (This shouldn't happen often for C because | |
1762 | GDB already does this earlier.) It's possible that GDB could | |
1763 | do it all the time but it's harmless to leave this code here. */ | |
1764 | ||
1765 | size = 0; | |
1766 | onstack_size = 0; | |
1767 | i = 0; | |
1768 | ||
1769 | if (struct_return) | |
1770 | size = REGISTER_SIZE; | |
1771 | ||
1772 | for (i = 0; i < nargs; i++) | |
1773 | { | |
1774 | struct argument_info *info = &arg_info[i]; | |
1775 | struct value *arg = args[i]; | |
1776 | struct type *arg_type = check_typedef (value_type (arg)); | |
1777 | ||
1778 | switch (TYPE_CODE (arg_type)) | |
1779 | { | |
1780 | case TYPE_CODE_INT: | |
1781 | case TYPE_CODE_BOOL: | |
1782 | case TYPE_CODE_CHAR: | |
1783 | case TYPE_CODE_RANGE: | |
1784 | case TYPE_CODE_ENUM: | |
1785 | ||
1786 | /* Cast argument to long if necessary as the mask does it too. */ | |
0dfff4cb UW |
1787 | if (TYPE_LENGTH (arg_type) |
1788 | < TYPE_LENGTH (builtin_type (gdbarch)->builtin_long)) | |
ca3bf3bd | 1789 | { |
0dfff4cb | 1790 | arg_type = builtin_type (gdbarch)->builtin_long; |
ca3bf3bd DJ |
1791 | arg = value_cast (arg_type, arg); |
1792 | } | |
bdb4c075 MG |
1793 | /* Aligment is equal to the type length for the basic types. */ |
1794 | info->align = TYPE_LENGTH (arg_type); | |
ca3bf3bd DJ |
1795 | break; |
1796 | ||
1797 | case TYPE_CODE_FLT: | |
1798 | ||
1799 | /* Align doubles correctly. */ | |
0dfff4cb UW |
1800 | if (TYPE_LENGTH (arg_type) |
1801 | == TYPE_LENGTH (builtin_type (gdbarch)->builtin_double)) | |
1802 | info->align = TYPE_LENGTH (builtin_type (gdbarch)->builtin_double); | |
ca3bf3bd | 1803 | else |
0dfff4cb | 1804 | info->align = TYPE_LENGTH (builtin_type (gdbarch)->builtin_long); |
ca3bf3bd DJ |
1805 | break; |
1806 | ||
1807 | case TYPE_CODE_STRUCT: | |
1808 | default: | |
0dfff4cb | 1809 | info->align = TYPE_LENGTH (builtin_type (gdbarch)->builtin_long); |
ca3bf3bd DJ |
1810 | break; |
1811 | } | |
1812 | info->length = TYPE_LENGTH (arg_type); | |
1813 | info->contents = value_contents (arg); | |
1814 | ||
1815 | /* Align size and onstack_size. */ | |
1816 | size = (size + info->align - 1) & ~(info->align - 1); | |
1817 | onstack_size = (onstack_size + info->align - 1) & ~(info->align - 1); | |
1818 | ||
91d8eb23 | 1819 | if (size + info->length > REGISTER_SIZE * ARG_NOF (gdbarch)) |
ca3bf3bd DJ |
1820 | { |
1821 | info->onstack = 1; | |
1822 | info->u.offset = onstack_size; | |
1823 | onstack_size += info->length; | |
1824 | } | |
1825 | else | |
1826 | { | |
1827 | info->onstack = 0; | |
91d8eb23 | 1828 | info->u.regno = ARG_1ST (gdbarch) + size / REGISTER_SIZE; |
ca3bf3bd DJ |
1829 | } |
1830 | size += info->length; | |
1831 | } | |
1832 | ||
1833 | /* Adjust the stack pointer and align it. */ | |
1834 | sp = align_down (sp - onstack_size, SP_ALIGNMENT); | |
1835 | ||
bdb4c075 | 1836 | /* Simulate MOVSP, if Windowed ABI. */ |
6b50c0b0 | 1837 | if ((gdbarch_tdep (gdbarch)->call_abi != CallAbiCall0Only) |
304fe255 | 1838 | && (sp != osp)) |
ca3bf3bd DJ |
1839 | { |
1840 | read_memory (osp - 16, buf, 16); | |
1841 | write_memory (sp - 16, buf, 16); | |
1842 | } | |
1843 | ||
1844 | /* Second Loop: Load arguments. */ | |
1845 | ||
1846 | if (struct_return) | |
1847 | { | |
e17a4113 | 1848 | store_unsigned_integer (buf, REGISTER_SIZE, byte_order, struct_addr); |
91d8eb23 | 1849 | regcache_cooked_write (regcache, ARG_1ST (gdbarch), buf); |
ca3bf3bd DJ |
1850 | } |
1851 | ||
1852 | for (i = 0; i < nargs; i++) | |
1853 | { | |
1854 | struct argument_info *info = &arg_info[i]; | |
1855 | ||
1856 | if (info->onstack) | |
1857 | { | |
1858 | int n = info->length; | |
1859 | CORE_ADDR offset = sp + info->u.offset; | |
1860 | ||
1861 | /* Odd-sized structs are aligned to the lower side of a memory | |
1862 | word in big-endian mode and require a shift. This only | |
1863 | applies for structures smaller than one word. */ | |
1864 | ||
4c6b5505 | 1865 | if (n < REGISTER_SIZE |
6b50c0b0 | 1866 | && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
ca3bf3bd DJ |
1867 | offset += (REGISTER_SIZE - n); |
1868 | ||
1869 | write_memory (offset, info->contents, info->length); | |
1870 | ||
1871 | } | |
1872 | else | |
1873 | { | |
1874 | int n = info->length; | |
1875 | const bfd_byte *cp = info->contents; | |
1876 | int r = info->u.regno; | |
1877 | ||
1878 | /* Odd-sized structs are aligned to the lower side of registers in | |
1879 | big-endian mode and require a shift. The odd-sized leftover will | |
1880 | be at the end. Note that this is only true for structures smaller | |
1881 | than REGISTER_SIZE; for larger odd-sized structures the excess | |
1882 | will be left-aligned in the register on both endiannesses. */ | |
1883 | ||
e17a4113 | 1884 | if (n < REGISTER_SIZE && byte_order == BFD_ENDIAN_BIG) |
ca3bf3bd | 1885 | { |
e17a4113 UW |
1886 | ULONGEST v; |
1887 | v = extract_unsigned_integer (cp, REGISTER_SIZE, byte_order); | |
ca3bf3bd DJ |
1888 | v = v >> ((REGISTER_SIZE - n) * TARGET_CHAR_BIT); |
1889 | ||
e17a4113 | 1890 | store_unsigned_integer (buf, REGISTER_SIZE, byte_order, v); |
ca3bf3bd DJ |
1891 | regcache_cooked_write (regcache, r, buf); |
1892 | ||
1893 | cp += REGISTER_SIZE; | |
1894 | n -= REGISTER_SIZE; | |
1895 | r++; | |
1896 | } | |
1897 | else | |
1898 | while (n > 0) | |
1899 | { | |
ca3bf3bd DJ |
1900 | regcache_cooked_write (regcache, r, cp); |
1901 | ||
ca3bf3bd DJ |
1902 | cp += REGISTER_SIZE; |
1903 | n -= REGISTER_SIZE; | |
1904 | r++; | |
1905 | } | |
1906 | } | |
1907 | } | |
1908 | ||
ca3bf3bd | 1909 | /* Set the return address of dummy frame to the dummy address. |
bdb4c075 | 1910 | The return address for the current function (in A0) is |
ca3bf3bd DJ |
1911 | saved in the dummy frame, so we can savely overwrite A0 here. */ |
1912 | ||
6b50c0b0 | 1913 | if (gdbarch_tdep (gdbarch)->call_abi != CallAbiCall0Only) |
bdb4c075 | 1914 | { |
98689b25 | 1915 | ULONGEST val; |
68d6df83 | 1916 | |
bdb4c075 | 1917 | ra = (bp_addr & 0x3fffffff) | 0x40000000; |
98689b25 MG |
1918 | regcache_raw_read_unsigned (regcache, gdbarch_ps_regnum (gdbarch), &val); |
1919 | ps = (unsigned long) val & ~0x00030000; | |
304fe255 | 1920 | regcache_cooked_write_unsigned |
6b50c0b0 | 1921 | (regcache, gdbarch_tdep (gdbarch)->a0_base + 4, ra); |
bdb4c075 | 1922 | regcache_cooked_write_unsigned (regcache, |
6b50c0b0 | 1923 | gdbarch_ps_regnum (gdbarch), |
bdb4c075 | 1924 | ps | 0x00010000); |
94a0e877 MG |
1925 | |
1926 | /* All the registers have been saved. After executing | |
1927 | dummy call, they all will be restored. So it's safe | |
1928 | to modify WINDOWSTART register to make it look like there | |
1929 | is only one register window corresponding to WINDOWEBASE. */ | |
1930 | ||
1931 | regcache_raw_read (regcache, gdbarch_tdep (gdbarch)->wb_regnum, buf); | |
e17a4113 UW |
1932 | regcache_cooked_write_unsigned |
1933 | (regcache, gdbarch_tdep (gdbarch)->ws_regnum, | |
1934 | 1 << extract_unsigned_integer (buf, 4, byte_order)); | |
bdb4c075 MG |
1935 | } |
1936 | else | |
1937 | { | |
1938 | /* Simulate CALL0: write RA into A0 register. */ | |
304fe255 | 1939 | regcache_cooked_write_unsigned |
94a0e877 | 1940 | (regcache, gdbarch_tdep (gdbarch)->a0_base, bp_addr); |
bdb4c075 | 1941 | } |
ca3bf3bd DJ |
1942 | |
1943 | /* Set new stack pointer and return it. */ | |
304fe255 | 1944 | regcache_cooked_write_unsigned (regcache, |
6b50c0b0 | 1945 | gdbarch_tdep (gdbarch)->a0_base + 1, sp); |
ca3bf3bd DJ |
1946 | /* Make dummy frame ID unique by adding a constant. */ |
1947 | return sp + SP_ALIGNMENT; | |
1948 | } | |
1949 | ||
cd6c3b4f YQ |
1950 | /* Implement the breakpoint_kind_from_pc gdbarch method. */ |
1951 | ||
d19280ad YQ |
1952 | static int |
1953 | xtensa_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) | |
1954 | { | |
1955 | if (gdbarch_tdep (gdbarch)->isa_use_density_instructions) | |
1956 | return 2; | |
1957 | else | |
1958 | return 4; | |
1959 | } | |
ca3bf3bd DJ |
1960 | |
1961 | /* Return a breakpoint for the current location of PC. We always use | |
1962 | the density version if we have density instructions (regardless of the | |
1963 | current instruction at PC), and use regular instructions otherwise. */ | |
1964 | ||
1965 | #define BIG_BREAKPOINT { 0x00, 0x04, 0x00 } | |
1966 | #define LITTLE_BREAKPOINT { 0x00, 0x40, 0x00 } | |
1967 | #define DENSITY_BIG_BREAKPOINT { 0xd2, 0x0f } | |
1968 | #define DENSITY_LITTLE_BREAKPOINT { 0x2d, 0xf0 } | |
1969 | ||
cd6c3b4f YQ |
1970 | /* Implement the sw_breakpoint_from_kind gdbarch method. */ |
1971 | ||
d19280ad YQ |
1972 | static const gdb_byte * |
1973 | xtensa_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size) | |
ca3bf3bd | 1974 | { |
d19280ad | 1975 | *size = kind; |
ca3bf3bd | 1976 | |
d19280ad | 1977 | if (kind == 4) |
ca3bf3bd | 1978 | { |
d19280ad YQ |
1979 | static unsigned char big_breakpoint[] = BIG_BREAKPOINT; |
1980 | static unsigned char little_breakpoint[] = LITTLE_BREAKPOINT; | |
1981 | ||
67d57894 | 1982 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
d19280ad | 1983 | return big_breakpoint; |
ca3bf3bd | 1984 | else |
d19280ad | 1985 | return little_breakpoint; |
ca3bf3bd DJ |
1986 | } |
1987 | else | |
1988 | { | |
d19280ad YQ |
1989 | static unsigned char density_big_breakpoint[] = DENSITY_BIG_BREAKPOINT; |
1990 | static unsigned char density_little_breakpoint[] | |
1991 | = DENSITY_LITTLE_BREAKPOINT; | |
1992 | ||
67d57894 | 1993 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
d19280ad | 1994 | return density_big_breakpoint; |
ca3bf3bd | 1995 | else |
d19280ad | 1996 | return density_little_breakpoint; |
ca3bf3bd DJ |
1997 | } |
1998 | } | |
1999 | ||
bdb4c075 MG |
2000 | /* Call0 ABI support routines. */ |
2001 | ||
f976a05d MG |
2002 | /* Return true, if PC points to "ret" or "ret.n". */ |
2003 | ||
2004 | static int | |
2005 | call0_ret (CORE_ADDR start_pc, CORE_ADDR finish_pc) | |
2006 | { | |
2007 | #define RETURN_RET goto done | |
2008 | xtensa_isa isa; | |
2009 | xtensa_insnbuf ins, slot; | |
948f8e3d | 2010 | gdb_byte ibuf[XTENSA_ISA_BSZ]; |
f976a05d MG |
2011 | CORE_ADDR ia, bt, ba; |
2012 | xtensa_format ifmt; | |
2013 | int ilen, islots, is; | |
2014 | xtensa_opcode opc; | |
2015 | const char *opcname; | |
2016 | int found_ret = 0; | |
2017 | ||
2018 | isa = xtensa_default_isa; | |
2019 | gdb_assert (XTENSA_ISA_BSZ >= xtensa_isa_maxlength (isa)); | |
2020 | ins = xtensa_insnbuf_alloc (isa); | |
2021 | slot = xtensa_insnbuf_alloc (isa); | |
2022 | ba = 0; | |
2023 | ||
2024 | for (ia = start_pc, bt = ia; ia < finish_pc ; ia += ilen) | |
2025 | { | |
2026 | if (ia + xtensa_isa_maxlength (isa) > bt) | |
2027 | { | |
2028 | ba = ia; | |
2029 | bt = (ba + XTENSA_ISA_BSZ) < finish_pc | |
2030 | ? ba + XTENSA_ISA_BSZ : finish_pc; | |
2031 | if (target_read_memory (ba, ibuf, bt - ba) != 0 ) | |
2032 | RETURN_RET; | |
2033 | } | |
2034 | ||
2035 | xtensa_insnbuf_from_chars (isa, ins, &ibuf[ia-ba], 0); | |
2036 | ifmt = xtensa_format_decode (isa, ins); | |
2037 | if (ifmt == XTENSA_UNDEFINED) | |
2038 | RETURN_RET; | |
2039 | ilen = xtensa_format_length (isa, ifmt); | |
2040 | if (ilen == XTENSA_UNDEFINED) | |
2041 | RETURN_RET; | |
2042 | islots = xtensa_format_num_slots (isa, ifmt); | |
2043 | if (islots == XTENSA_UNDEFINED) | |
2044 | RETURN_RET; | |
2045 | ||
2046 | for (is = 0; is < islots; ++is) | |
2047 | { | |
2048 | if (xtensa_format_get_slot (isa, ifmt, is, ins, slot)) | |
2049 | RETURN_RET; | |
2050 | ||
2051 | opc = xtensa_opcode_decode (isa, ifmt, is, slot); | |
2052 | if (opc == XTENSA_UNDEFINED) | |
2053 | RETURN_RET; | |
2054 | ||
2055 | opcname = xtensa_opcode_name (isa, opc); | |
2056 | ||
2057 | if ((strcasecmp (opcname, "ret.n") == 0) | |
2058 | || (strcasecmp (opcname, "ret") == 0)) | |
2059 | { | |
2060 | found_ret = 1; | |
2061 | RETURN_RET; | |
2062 | } | |
2063 | } | |
2064 | } | |
2065 | done: | |
2066 | xtensa_insnbuf_free(isa, slot); | |
2067 | xtensa_insnbuf_free(isa, ins); | |
2068 | return found_ret; | |
2069 | } | |
2070 | ||
bdb4c075 MG |
2071 | /* Call0 opcode class. Opcodes are preclassified according to what they |
2072 | mean for Call0 prologue analysis, and their number of significant operands. | |
2073 | The purpose of this is to simplify prologue analysis by separating | |
2074 | instruction decoding (libisa) from the semantics of prologue analysis. */ | |
2075 | ||
68d6df83 MG |
2076 | typedef enum |
2077 | { | |
bdb4c075 MG |
2078 | c0opc_illegal, /* Unknown to libisa (invalid) or 'ill' opcode. */ |
2079 | c0opc_uninteresting, /* Not interesting for Call0 prologue analysis. */ | |
2080 | c0opc_flow, /* Flow control insn. */ | |
2081 | c0opc_entry, /* ENTRY indicates non-Call0 prologue. */ | |
2082 | c0opc_break, /* Debugger software breakpoints. */ | |
2083 | c0opc_add, /* Adding two registers. */ | |
2084 | c0opc_addi, /* Adding a register and an immediate. */ | |
dbab50de | 2085 | c0opc_and, /* Bitwise "and"-ing two registers. */ |
bdb4c075 MG |
2086 | c0opc_sub, /* Subtracting a register from a register. */ |
2087 | c0opc_mov, /* Moving a register to a register. */ | |
2088 | c0opc_movi, /* Moving an immediate to a register. */ | |
2089 | c0opc_l32r, /* Loading a literal. */ | |
08b9c608 MG |
2090 | c0opc_s32i, /* Storing word at fixed offset from a base register. */ |
2091 | c0opc_rwxsr, /* RSR, WRS, or XSR instructions. */ | |
2092 | c0opc_l32e, /* L32E instruction. */ | |
2093 | c0opc_s32e, /* S32E instruction. */ | |
2094 | c0opc_rfwo, /* RFWO instruction. */ | |
2095 | c0opc_rfwu, /* RFWU instruction. */ | |
bdb4c075 MG |
2096 | c0opc_NrOf /* Number of opcode classifications. */ |
2097 | } xtensa_insn_kind; | |
2098 | ||
08b9c608 MG |
2099 | /* Return true, if OPCNAME is RSR, WRS, or XSR instruction. */ |
2100 | ||
2101 | static int | |
2102 | rwx_special_register (const char *opcname) | |
2103 | { | |
2104 | char ch = *opcname++; | |
2105 | ||
2106 | if ((ch != 'r') && (ch != 'w') && (ch != 'x')) | |
2107 | return 0; | |
2108 | if (*opcname++ != 's') | |
2109 | return 0; | |
2110 | if (*opcname++ != 'r') | |
2111 | return 0; | |
2112 | if (*opcname++ != '.') | |
2113 | return 0; | |
2114 | ||
2115 | return 1; | |
2116 | } | |
bdb4c075 MG |
2117 | |
2118 | /* Classify an opcode based on what it means for Call0 prologue analysis. */ | |
2119 | ||
2120 | static xtensa_insn_kind | |
2121 | call0_classify_opcode (xtensa_isa isa, xtensa_opcode opc) | |
2122 | { | |
2123 | const char *opcname; | |
2124 | xtensa_insn_kind opclass = c0opc_uninteresting; | |
2125 | ||
2126 | DEBUGTRACE ("call0_classify_opcode (..., opc = %d)\n", opc); | |
2127 | ||
2128 | /* Get opcode name and handle special classifications. */ | |
2129 | ||
2130 | opcname = xtensa_opcode_name (isa, opc); | |
2131 | ||
2132 | if (opcname == NULL | |
2133 | || strcasecmp (opcname, "ill") == 0 | |
2134 | || strcasecmp (opcname, "ill.n") == 0) | |
2135 | opclass = c0opc_illegal; | |
2136 | else if (strcasecmp (opcname, "break") == 0 | |
2137 | || strcasecmp (opcname, "break.n") == 0) | |
2138 | opclass = c0opc_break; | |
2139 | else if (strcasecmp (opcname, "entry") == 0) | |
2140 | opclass = c0opc_entry; | |
08b9c608 MG |
2141 | else if (strcasecmp (opcname, "rfwo") == 0) |
2142 | opclass = c0opc_rfwo; | |
2143 | else if (strcasecmp (opcname, "rfwu") == 0) | |
2144 | opclass = c0opc_rfwu; | |
bdb4c075 MG |
2145 | else if (xtensa_opcode_is_branch (isa, opc) > 0 |
2146 | || xtensa_opcode_is_jump (isa, opc) > 0 | |
2147 | || xtensa_opcode_is_loop (isa, opc) > 0 | |
2148 | || xtensa_opcode_is_call (isa, opc) > 0 | |
2149 | || strcasecmp (opcname, "simcall") == 0 | |
2150 | || strcasecmp (opcname, "syscall") == 0) | |
2151 | opclass = c0opc_flow; | |
2152 | ||
2153 | /* Also, classify specific opcodes that need to be tracked. */ | |
2154 | else if (strcasecmp (opcname, "add") == 0 | |
2155 | || strcasecmp (opcname, "add.n") == 0) | |
2156 | opclass = c0opc_add; | |
dbab50de MG |
2157 | else if (strcasecmp (opcname, "and") == 0) |
2158 | opclass = c0opc_and; | |
bdb4c075 MG |
2159 | else if (strcasecmp (opcname, "addi") == 0 |
2160 | || strcasecmp (opcname, "addi.n") == 0 | |
2161 | || strcasecmp (opcname, "addmi") == 0) | |
2162 | opclass = c0opc_addi; | |
2163 | else if (strcasecmp (opcname, "sub") == 0) | |
2164 | opclass = c0opc_sub; | |
2165 | else if (strcasecmp (opcname, "mov.n") == 0 | |
2166 | || strcasecmp (opcname, "or") == 0) /* Could be 'mov' asm macro. */ | |
2167 | opclass = c0opc_mov; | |
2168 | else if (strcasecmp (opcname, "movi") == 0 | |
2169 | || strcasecmp (opcname, "movi.n") == 0) | |
2170 | opclass = c0opc_movi; | |
2171 | else if (strcasecmp (opcname, "l32r") == 0) | |
2172 | opclass = c0opc_l32r; | |
2173 | else if (strcasecmp (opcname, "s32i") == 0 | |
2174 | || strcasecmp (opcname, "s32i.n") == 0) | |
2175 | opclass = c0opc_s32i; | |
08b9c608 MG |
2176 | else if (strcasecmp (opcname, "l32e") == 0) |
2177 | opclass = c0opc_l32e; | |
2178 | else if (strcasecmp (opcname, "s32e") == 0) | |
2179 | opclass = c0opc_s32e; | |
2180 | else if (rwx_special_register (opcname)) | |
2181 | opclass = c0opc_rwxsr; | |
bdb4c075 MG |
2182 | |
2183 | return opclass; | |
2184 | } | |
2185 | ||
2186 | /* Tracks register movement/mutation for a given operation, which may | |
2187 | be within a bundle. Updates the destination register tracking info | |
2188 | accordingly. The pc is needed only for pc-relative load instructions | |
2189 | (eg. l32r). The SP register number is needed to identify stores to | |
dbab50de MG |
2190 | the stack frame. Returns 0, if analysis was succesfull, non-zero |
2191 | otherwise. */ | |
bdb4c075 | 2192 | |
dbab50de MG |
2193 | static int |
2194 | call0_track_op (struct gdbarch *gdbarch, xtensa_c0reg_t dst[], xtensa_c0reg_t src[], | |
bdb4c075 | 2195 | xtensa_insn_kind opclass, int nods, unsigned odv[], |
dbab50de | 2196 | CORE_ADDR pc, int spreg, xtensa_frame_cache_t *cache) |
bdb4c075 | 2197 | { |
e17a4113 | 2198 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
dbab50de | 2199 | unsigned litbase, litaddr, litval; |
bdb4c075 MG |
2200 | |
2201 | switch (opclass) | |
2202 | { | |
2203 | case c0opc_addi: | |
2204 | /* 3 operands: dst, src, imm. */ | |
2205 | gdb_assert (nods == 3); | |
2206 | dst[odv[0]].fr_reg = src[odv[1]].fr_reg; | |
2207 | dst[odv[0]].fr_ofs = src[odv[1]].fr_ofs + odv[2]; | |
2208 | break; | |
2209 | case c0opc_add: | |
2210 | /* 3 operands: dst, src1, src2. */ | |
08b9c608 | 2211 | gdb_assert (nods == 3); |
bdb4c075 MG |
2212 | if (src[odv[1]].fr_reg == C0_CONST) |
2213 | { | |
2214 | dst[odv[0]].fr_reg = src[odv[2]].fr_reg; | |
2215 | dst[odv[0]].fr_ofs = src[odv[2]].fr_ofs + src[odv[1]].fr_ofs; | |
2216 | } | |
2217 | else if (src[odv[2]].fr_reg == C0_CONST) | |
2218 | { | |
2219 | dst[odv[0]].fr_reg = src[odv[1]].fr_reg; | |
2220 | dst[odv[0]].fr_ofs = src[odv[1]].fr_ofs + src[odv[2]].fr_ofs; | |
2221 | } | |
2222 | else dst[odv[0]].fr_reg = C0_INEXP; | |
2223 | break; | |
dbab50de MG |
2224 | case c0opc_and: |
2225 | /* 3 operands: dst, src1, src2. */ | |
2226 | gdb_assert (nods == 3); | |
2227 | if (cache->c0.c0_fpalign == 0) | |
2228 | { | |
2229 | /* Handle dynamic stack alignment. */ | |
2230 | if ((src[odv[0]].fr_reg == spreg) && (src[odv[1]].fr_reg == spreg)) | |
2231 | { | |
2232 | if (src[odv[2]].fr_reg == C0_CONST) | |
2233 | cache->c0.c0_fpalign = src[odv[2]].fr_ofs; | |
2234 | break; | |
2235 | } | |
2236 | else if ((src[odv[0]].fr_reg == spreg) | |
2237 | && (src[odv[2]].fr_reg == spreg)) | |
2238 | { | |
2239 | if (src[odv[1]].fr_reg == C0_CONST) | |
2240 | cache->c0.c0_fpalign = src[odv[1]].fr_ofs; | |
2241 | break; | |
2242 | } | |
2243 | /* else fall through. */ | |
2244 | } | |
2245 | if (src[odv[1]].fr_reg == C0_CONST) | |
2246 | { | |
2247 | dst[odv[0]].fr_reg = src[odv[2]].fr_reg; | |
2248 | dst[odv[0]].fr_ofs = src[odv[2]].fr_ofs & src[odv[1]].fr_ofs; | |
2249 | } | |
2250 | else if (src[odv[2]].fr_reg == C0_CONST) | |
2251 | { | |
2252 | dst[odv[0]].fr_reg = src[odv[1]].fr_reg; | |
2253 | dst[odv[0]].fr_ofs = src[odv[1]].fr_ofs & src[odv[2]].fr_ofs; | |
2254 | } | |
2255 | else dst[odv[0]].fr_reg = C0_INEXP; | |
2256 | break; | |
bdb4c075 MG |
2257 | case c0opc_sub: |
2258 | /* 3 operands: dst, src1, src2. */ | |
2259 | gdb_assert (nods == 3); | |
2260 | if (src[odv[2]].fr_reg == C0_CONST) | |
2261 | { | |
2262 | dst[odv[0]].fr_reg = src[odv[1]].fr_reg; | |
2263 | dst[odv[0]].fr_ofs = src[odv[1]].fr_ofs - src[odv[2]].fr_ofs; | |
2264 | } | |
2265 | else dst[odv[0]].fr_reg = C0_INEXP; | |
2266 | break; | |
2267 | case c0opc_mov: | |
2268 | /* 2 operands: dst, src [, src]. */ | |
2269 | gdb_assert (nods == 2); | |
dbab50de MG |
2270 | /* First, check if it's a special case of saving unaligned SP |
2271 | to a spare register in case of dynamic stack adjustment. | |
2272 | But, only do it one time. The second time could be initializing | |
2273 | frame pointer. We don't want to overwrite the first one. */ | |
2274 | if ((odv[1] == spreg) && (cache->c0.c0_old_sp == C0_INEXP)) | |
2275 | cache->c0.c0_old_sp = odv[0]; | |
2276 | ||
bdb4c075 MG |
2277 | dst[odv[0]].fr_reg = src[odv[1]].fr_reg; |
2278 | dst[odv[0]].fr_ofs = src[odv[1]].fr_ofs; | |
2279 | break; | |
2280 | case c0opc_movi: | |
2281 | /* 2 operands: dst, imm. */ | |
2282 | gdb_assert (nods == 2); | |
2283 | dst[odv[0]].fr_reg = C0_CONST; | |
2284 | dst[odv[0]].fr_ofs = odv[1]; | |
2285 | break; | |
2286 | case c0opc_l32r: | |
2287 | /* 2 operands: dst, literal offset. */ | |
2288 | gdb_assert (nods == 2); | |
dbab50de MG |
2289 | /* litbase = xtensa_get_litbase (pc); can be also used. */ |
2290 | litbase = (gdbarch_tdep (gdbarch)->litbase_regnum == -1) | |
2291 | ? 0 : xtensa_read_register | |
2292 | (gdbarch_tdep (gdbarch)->litbase_regnum); | |
bdb4c075 MG |
2293 | litaddr = litbase & 1 |
2294 | ? (litbase & ~1) + (signed)odv[1] | |
2295 | : (pc + 3 + (signed)odv[1]) & ~3; | |
e17a4113 | 2296 | litval = read_memory_integer (litaddr, 4, byte_order); |
bdb4c075 MG |
2297 | dst[odv[0]].fr_reg = C0_CONST; |
2298 | dst[odv[0]].fr_ofs = litval; | |
2299 | break; | |
2300 | case c0opc_s32i: | |
2301 | /* 3 operands: value, base, offset. */ | |
2302 | gdb_assert (nods == 3 && spreg >= 0 && spreg < C0_NREGS); | |
dbab50de MG |
2303 | /* First, check if it's a spill for saved unaligned SP, |
2304 | when dynamic stack adjustment was applied to this frame. */ | |
2305 | if ((cache->c0.c0_fpalign != 0) /* Dynamic stack adjustment. */ | |
2306 | && (odv[1] == spreg) /* SP usage indicates spill. */ | |
2307 | && (odv[0] == cache->c0.c0_old_sp)) /* Old SP register spilled. */ | |
2308 | cache->c0.c0_sp_ofs = odv[2]; | |
2309 | ||
bdb4c075 MG |
2310 | if (src[odv[1]].fr_reg == spreg /* Store to stack frame. */ |
2311 | && (src[odv[1]].fr_ofs & 3) == 0 /* Alignment preserved. */ | |
2312 | && src[odv[0]].fr_reg >= 0 /* Value is from a register. */ | |
2313 | && src[odv[0]].fr_ofs == 0 /* Value hasn't been modified. */ | |
2314 | && src[src[odv[0]].fr_reg].to_stk == C0_NOSTK) /* First time. */ | |
2315 | { | |
2316 | /* ISA encoding guarantees alignment. But, check it anyway. */ | |
2317 | gdb_assert ((odv[2] & 3) == 0); | |
2318 | dst[src[odv[0]].fr_reg].to_stk = src[odv[1]].fr_ofs + odv[2]; | |
2319 | } | |
2320 | break; | |
dbab50de MG |
2321 | /* If we end up inside Window Overflow / Underflow interrupt handler |
2322 | report an error because these handlers should have been handled | |
2323 | already in a different way. */ | |
2324 | case c0opc_l32e: | |
2325 | case c0opc_s32e: | |
2326 | case c0opc_rfwo: | |
2327 | case c0opc_rfwu: | |
2328 | return 1; | |
bdb4c075 | 2329 | default: |
dbab50de | 2330 | return 1; |
bdb4c075 | 2331 | } |
dbab50de | 2332 | return 0; |
bdb4c075 MG |
2333 | } |
2334 | ||
dbab50de | 2335 | /* Analyze prologue of the function at start address to determine if it uses |
bdb4c075 | 2336 | the Call0 ABI, and if so track register moves and linear modifications |
dbab50de MG |
2337 | in the prologue up to the PC or just beyond the prologue, whichever is |
2338 | first. An 'entry' instruction indicates non-Call0 ABI and the end of the | |
2339 | prologue. The prologue may overlap non-prologue instructions but is | |
2340 | guaranteed to end by the first flow-control instruction (jump, branch, | |
2341 | call or return). Since an optimized function may move information around | |
2342 | and change the stack frame arbitrarily during the prologue, the information | |
2343 | is guaranteed valid only at the point in the function indicated by the PC. | |
bdb4c075 MG |
2344 | May be used to skip the prologue or identify the ABI, w/o tracking. |
2345 | ||
2346 | Returns: Address of first instruction after prologue, or PC (whichever | |
2347 | is first), or 0, if decoding failed (in libisa). | |
2348 | Input args: | |
2349 | start Start address of function/prologue. | |
2350 | pc Program counter to stop at. Use 0 to continue to end of prologue. | |
2351 | If 0, avoids infinite run-on in corrupt code memory by bounding | |
2352 | the scan to the end of the function if that can be determined. | |
dbab50de | 2353 | nregs Number of general registers to track. |
bdb4c075 | 2354 | InOut args: |
dbab50de | 2355 | cache Xtensa frame cache. |
bdb4c075 MG |
2356 | |
2357 | Note that these may produce useful results even if decoding fails | |
2358 | because they begin with default assumptions that analysis may change. */ | |
2359 | ||
2360 | static CORE_ADDR | |
e17a4113 | 2361 | call0_analyze_prologue (struct gdbarch *gdbarch, |
dbab50de MG |
2362 | CORE_ADDR start, CORE_ADDR pc, |
2363 | int nregs, xtensa_frame_cache_t *cache) | |
bdb4c075 MG |
2364 | { |
2365 | CORE_ADDR ia; /* Current insn address in prologue. */ | |
2366 | CORE_ADDR ba = 0; /* Current address at base of insn buffer. */ | |
2367 | CORE_ADDR bt; /* Current address at top+1 of insn buffer. */ | |
948f8e3d | 2368 | gdb_byte ibuf[XTENSA_ISA_BSZ];/* Instruction buffer for decoding prologue. */ |
bdb4c075 MG |
2369 | xtensa_isa isa; /* libisa ISA handle. */ |
2370 | xtensa_insnbuf ins, slot; /* libisa handle to decoded insn, slot. */ | |
2371 | xtensa_format ifmt; /* libisa instruction format. */ | |
2372 | int ilen, islots, is; /* Instruction length, nbr slots, current slot. */ | |
2373 | xtensa_opcode opc; /* Opcode in current slot. */ | |
2374 | xtensa_insn_kind opclass; /* Opcode class for Call0 prologue analysis. */ | |
2375 | int nods; /* Opcode number of operands. */ | |
2376 | unsigned odv[C0_MAXOPDS]; /* Operand values in order provided by libisa. */ | |
2377 | xtensa_c0reg_t *rtmp; /* Register tracking info snapshot. */ | |
2378 | int j; /* General loop counter. */ | |
2379 | int fail = 0; /* Set non-zero and exit, if decoding fails. */ | |
2380 | CORE_ADDR body_pc; /* The PC for the first non-prologue insn. */ | |
2381 | CORE_ADDR end_pc; /* The PC for the lust function insn. */ | |
2382 | ||
2383 | struct symtab_and_line prologue_sal; | |
2384 | ||
2385 | DEBUGTRACE ("call0_analyze_prologue (start = 0x%08x, pc = 0x%08x, ...)\n", | |
2386 | (int)start, (int)pc); | |
2387 | ||
2388 | /* Try to limit the scan to the end of the function if a non-zero pc | |
2389 | arg was not supplied to avoid probing beyond the end of valid memory. | |
2390 | If memory is full of garbage that classifies as c0opc_uninteresting. | |
2391 | If this fails (eg. if no symbols) pc ends up 0 as it was. | |
26c4b26f | 2392 | Initialize the Call0 frame and register tracking info. |
bdb4c075 MG |
2393 | Assume it's Call0 until an 'entry' instruction is encountered. |
2394 | Assume we may be in the prologue until we hit a flow control instr. */ | |
2395 | ||
2396 | rtmp = NULL; | |
8179e739 | 2397 | body_pc = UINT_MAX; |
bdb4c075 MG |
2398 | end_pc = 0; |
2399 | ||
2400 | /* Find out, if we have an information about the prologue from DWARF. */ | |
2401 | prologue_sal = find_pc_line (start, 0); | |
2402 | if (prologue_sal.line != 0) /* Found debug info. */ | |
2403 | body_pc = prologue_sal.end; | |
2404 | ||
2405 | /* If we are going to analyze the prologue in general without knowing about | |
2406 | the current PC, make the best assumtion for the end of the prologue. */ | |
2407 | if (pc == 0) | |
2408 | { | |
2409 | find_pc_partial_function (start, 0, NULL, &end_pc); | |
325fac50 | 2410 | body_pc = std::min (end_pc, body_pc); |
bdb4c075 MG |
2411 | } |
2412 | else | |
325fac50 | 2413 | body_pc = std::min (pc, body_pc); |
bdb4c075 | 2414 | |
dbab50de MG |
2415 | cache->call0 = 1; |
2416 | rtmp = (xtensa_c0reg_t*) alloca(nregs * sizeof(xtensa_c0reg_t)); | |
bdb4c075 MG |
2417 | |
2418 | isa = xtensa_default_isa; | |
2ff5e605 | 2419 | gdb_assert (XTENSA_ISA_BSZ >= xtensa_isa_maxlength (isa)); |
bdb4c075 MG |
2420 | ins = xtensa_insnbuf_alloc (isa); |
2421 | slot = xtensa_insnbuf_alloc (isa); | |
2422 | ||
2423 | for (ia = start, bt = ia; ia < body_pc ; ia += ilen) | |
2424 | { | |
2425 | /* (Re)fill instruction buffer from memory if necessary, but do not | |
2426 | read memory beyond PC to be sure we stay within text section | |
2427 | (this protection only works if a non-zero pc is supplied). */ | |
2428 | ||
2429 | if (ia + xtensa_isa_maxlength (isa) > bt) | |
2430 | { | |
2431 | ba = ia; | |
2ff5e605 | 2432 | bt = (ba + XTENSA_ISA_BSZ) < body_pc ? ba + XTENSA_ISA_BSZ : body_pc; |
dbab50de MG |
2433 | if (target_read_memory (ba, ibuf, bt - ba) != 0 ) |
2434 | error (_("Unable to read target memory ...")); | |
bdb4c075 MG |
2435 | } |
2436 | ||
2437 | /* Decode format information. */ | |
2438 | ||
2439 | xtensa_insnbuf_from_chars (isa, ins, &ibuf[ia-ba], 0); | |
2440 | ifmt = xtensa_format_decode (isa, ins); | |
2441 | if (ifmt == XTENSA_UNDEFINED) | |
2442 | { | |
2443 | fail = 1; | |
2444 | goto done; | |
2445 | } | |
2446 | ilen = xtensa_format_length (isa, ifmt); | |
2447 | if (ilen == XTENSA_UNDEFINED) | |
2448 | { | |
2449 | fail = 1; | |
2450 | goto done; | |
2451 | } | |
2452 | islots = xtensa_format_num_slots (isa, ifmt); | |
2453 | if (islots == XTENSA_UNDEFINED) | |
2454 | { | |
2455 | fail = 1; | |
2456 | goto done; | |
2457 | } | |
2458 | ||
2459 | /* Analyze a bundle or a single instruction, using a snapshot of | |
2460 | the register tracking info as input for the entire bundle so that | |
2461 | register changes do not take effect within this bundle. */ | |
ca3bf3bd | 2462 | |
bdb4c075 | 2463 | for (j = 0; j < nregs; ++j) |
dbab50de | 2464 | rtmp[j] = cache->c0.c0_rt[j]; |
bdb4c075 MG |
2465 | |
2466 | for (is = 0; is < islots; ++is) | |
2467 | { | |
2468 | /* Decode a slot and classify the opcode. */ | |
2469 | ||
2470 | fail = xtensa_format_get_slot (isa, ifmt, is, ins, slot); | |
2471 | if (fail) | |
2472 | goto done; | |
2473 | ||
2474 | opc = xtensa_opcode_decode (isa, ifmt, is, slot); | |
dbab50de | 2475 | DEBUGVERB ("[call0_analyze_prologue] instr addr = 0x%08x, opc = %d\n", |
bdb4c075 MG |
2476 | (unsigned)ia, opc); |
2477 | if (opc == XTENSA_UNDEFINED) | |
2478 | opclass = c0opc_illegal; | |
2479 | else | |
2480 | opclass = call0_classify_opcode (isa, opc); | |
2481 | ||
2482 | /* Decide whether to track this opcode, ignore it, or bail out. */ | |
2483 | ||
2484 | switch (opclass) | |
2485 | { | |
2486 | case c0opc_illegal: | |
2487 | case c0opc_break: | |
2488 | fail = 1; | |
2489 | goto done; | |
2490 | ||
2491 | case c0opc_uninteresting: | |
2492 | continue; | |
2493 | ||
dbab50de MG |
2494 | case c0opc_flow: /* Flow control instructions stop analysis. */ |
2495 | case c0opc_rwxsr: /* RSR, WSR, XSR instructions stop analysis. */ | |
bdb4c075 MG |
2496 | goto done; |
2497 | ||
2498 | case c0opc_entry: | |
dbab50de | 2499 | cache->call0 = 0; |
bdb4c075 MG |
2500 | ia += ilen; /* Skip over 'entry' insn. */ |
2501 | goto done; | |
2502 | ||
2503 | default: | |
dbab50de | 2504 | cache->call0 = 1; |
bdb4c075 MG |
2505 | } |
2506 | ||
2507 | /* Only expected opcodes should get this far. */ | |
bdb4c075 MG |
2508 | |
2509 | /* Extract and decode the operands. */ | |
2510 | nods = xtensa_opcode_num_operands (isa, opc); | |
2511 | if (nods == XTENSA_UNDEFINED) | |
2512 | { | |
2513 | fail = 1; | |
2514 | goto done; | |
2515 | } | |
2516 | ||
2517 | for (j = 0; j < nods && j < C0_MAXOPDS; ++j) | |
2518 | { | |
2519 | fail = xtensa_operand_get_field (isa, opc, j, ifmt, | |
2520 | is, slot, &odv[j]); | |
2521 | if (fail) | |
2522 | goto done; | |
2523 | ||
2524 | fail = xtensa_operand_decode (isa, opc, j, &odv[j]); | |
2525 | if (fail) | |
2526 | goto done; | |
2527 | } | |
2528 | ||
2529 | /* Check operands to verify use of 'mov' assembler macro. */ | |
2530 | if (opclass == c0opc_mov && nods == 3) | |
2531 | { | |
2532 | if (odv[2] == odv[1]) | |
dbab50de MG |
2533 | { |
2534 | nods = 2; | |
2535 | if ((odv[0] == 1) && (odv[1] != 1)) | |
2536 | /* OR A1, An, An , where n != 1. | |
2537 | This means we are inside epilogue already. */ | |
2538 | goto done; | |
2539 | } | |
bdb4c075 MG |
2540 | else |
2541 | { | |
2542 | opclass = c0opc_uninteresting; | |
2543 | continue; | |
2544 | } | |
2545 | } | |
2546 | ||
2547 | /* Track register movement and modification for this operation. */ | |
dbab50de MG |
2548 | fail = call0_track_op (gdbarch, cache->c0.c0_rt, rtmp, |
2549 | opclass, nods, odv, ia, 1, cache); | |
2550 | if (fail) | |
2551 | goto done; | |
bdb4c075 MG |
2552 | } |
2553 | } | |
2554 | done: | |
2555 | DEBUGVERB ("[call0_analyze_prologue] stopped at instr addr 0x%08x, %s\n", | |
2556 | (unsigned)ia, fail ? "failed" : "succeeded"); | |
2557 | xtensa_insnbuf_free(isa, slot); | |
2558 | xtensa_insnbuf_free(isa, ins); | |
d4709618 | 2559 | return fail ? XTENSA_ISA_BADPC : ia; |
bdb4c075 MG |
2560 | } |
2561 | ||
5142f611 | 2562 | /* Initialize frame cache for the current frame in CALL0 ABI. */ |
bdb4c075 MG |
2563 | |
2564 | static void | |
5142f611 | 2565 | call0_frame_cache (struct frame_info *this_frame, |
dbab50de | 2566 | xtensa_frame_cache_t *cache, CORE_ADDR pc) |
bdb4c075 | 2567 | { |
5142f611 | 2568 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
e17a4113 | 2569 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
bdb4c075 MG |
2570 | CORE_ADDR start_pc; /* The beginning of the function. */ |
2571 | CORE_ADDR body_pc=UINT_MAX; /* PC, where prologue analysis stopped. */ | |
2572 | CORE_ADDR sp, fp, ra; | |
dbab50de | 2573 | int fp_regnum = C0_SP, c0_hasfp = 0, c0_frmsz = 0, prev_sp = 0, to_stk; |
bdb4c075 | 2574 | |
dbab50de MG |
2575 | sp = get_frame_register_unsigned |
2576 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + 1); | |
2577 | fp = sp; /* Assume FP == SP until proven otherwise. */ | |
2578 | ||
bdb4c075 MG |
2579 | /* Find the beginning of the prologue of the function containing the PC |
2580 | and analyze it up to the PC or the end of the prologue. */ | |
2581 | ||
2582 | if (find_pc_partial_function (pc, NULL, &start_pc, NULL)) | |
2583 | { | |
dbab50de | 2584 | body_pc = call0_analyze_prologue (gdbarch, start_pc, pc, C0_NREGS, cache); |
d4709618 MG |
2585 | |
2586 | if (body_pc == XTENSA_ISA_BADPC) | |
dbab50de MG |
2587 | { |
2588 | warning_once (); | |
2589 | ra = 0; | |
2590 | goto finish_frame_analysis; | |
2591 | } | |
bdb4c075 MG |
2592 | } |
2593 | ||
bdb4c075 MG |
2594 | /* Get the frame information and FP (if used) at the current PC. |
2595 | If PC is in the prologue, the prologue analysis is more reliable | |
dbab50de MG |
2596 | than DWARF info. We don't not know for sure, if PC is in the prologue, |
2597 | but we do know no calls have yet taken place, so we can almost | |
bdb4c075 MG |
2598 | certainly rely on the prologue analysis. */ |
2599 | ||
2600 | if (body_pc <= pc) | |
2601 | { | |
2602 | /* Prologue analysis was successful up to the PC. | |
2603 | It includes the cases when PC == START_PC. */ | |
2604 | c0_hasfp = cache->c0.c0_rt[C0_FP].fr_reg == C0_SP; | |
2605 | /* c0_hasfp == true means there is a frame pointer because | |
2606 | we analyzed the prologue and found that cache->c0.c0_rt[C0_FP] | |
2607 | was derived from SP. Otherwise, it would be C0_FP. */ | |
2608 | fp_regnum = c0_hasfp ? C0_FP : C0_SP; | |
2609 | c0_frmsz = - cache->c0.c0_rt[fp_regnum].fr_ofs; | |
6b50c0b0 | 2610 | fp_regnum += gdbarch_tdep (gdbarch)->a0_base; |
bdb4c075 MG |
2611 | } |
2612 | else /* No data from the prologue analysis. */ | |
2613 | { | |
2614 | c0_hasfp = 0; | |
6b50c0b0 | 2615 | fp_regnum = gdbarch_tdep (gdbarch)->a0_base + C0_SP; |
bdb4c075 MG |
2616 | c0_frmsz = 0; |
2617 | start_pc = pc; | |
2618 | } | |
2619 | ||
dbab50de MG |
2620 | if (cache->c0.c0_fpalign) |
2621 | { | |
2622 | /* This frame has a special prologue with a dynamic stack adjustment | |
2623 | to force an alignment, which is bigger than standard 16 bytes. */ | |
2624 | ||
2625 | CORE_ADDR unaligned_sp; | |
2626 | ||
2627 | if (cache->c0.c0_old_sp == C0_INEXP) | |
2628 | /* This can't be. Prologue code should be consistent. | |
2629 | Unaligned stack pointer should be saved in a spare register. */ | |
2630 | { | |
2631 | warning_once (); | |
2632 | ra = 0; | |
2633 | goto finish_frame_analysis; | |
2634 | } | |
2635 | ||
2636 | if (cache->c0.c0_sp_ofs == C0_NOSTK) | |
2637 | /* Saved unaligned value of SP is kept in a register. */ | |
2638 | unaligned_sp = get_frame_register_unsigned | |
2639 | (this_frame, gdbarch_tdep (gdbarch)->a0_base + cache->c0.c0_old_sp); | |
2640 | else | |
2641 | /* Get the value from stack. */ | |
2642 | unaligned_sp = (CORE_ADDR) | |
2643 | read_memory_integer (fp + cache->c0.c0_sp_ofs, 4, byte_order); | |
2644 | ||
2645 | prev_sp = unaligned_sp + c0_frmsz; | |
2646 | } | |
2647 | else | |
2648 | prev_sp = fp + c0_frmsz; | |
bdb4c075 MG |
2649 | |
2650 | /* Frame size from debug info or prologue tracking does not account for | |
2651 | alloca() and other dynamic allocations. Adjust frame size by FP - SP. */ | |
2652 | if (c0_hasfp) | |
2653 | { | |
5142f611 | 2654 | fp = get_frame_register_unsigned (this_frame, fp_regnum); |
bdb4c075 | 2655 | |
bdb4c075 MG |
2656 | /* Update the stack frame size. */ |
2657 | c0_frmsz += fp - sp; | |
2658 | } | |
2659 | ||
2660 | /* Get the return address (RA) from the stack if saved, | |
2661 | or try to get it from a register. */ | |
2662 | ||
2663 | to_stk = cache->c0.c0_rt[C0_RA].to_stk; | |
2664 | if (to_stk != C0_NOSTK) | |
2665 | ra = (CORE_ADDR) | |
e17a4113 UW |
2666 | read_memory_integer (sp + c0_frmsz + cache->c0.c0_rt[C0_RA].to_stk, |
2667 | 4, byte_order); | |
bdb4c075 MG |
2668 | |
2669 | else if (cache->c0.c0_rt[C0_RA].fr_reg == C0_CONST | |
2670 | && cache->c0.c0_rt[C0_RA].fr_ofs == 0) | |
2671 | { | |
dbab50de MG |
2672 | /* Special case for terminating backtrace at a function that wants to |
2673 | be seen as the outermost one. Such a function will clear it's RA (A0) | |
2674 | register to 0 in the prologue instead of saving its original value. */ | |
bdb4c075 MG |
2675 | ra = 0; |
2676 | } | |
2677 | else | |
2678 | { | |
dbab50de MG |
2679 | /* RA was copied to another register or (before any function call) may |
2680 | still be in the original RA register. This is not always reliable: | |
2681 | even in a leaf function, register tracking stops after prologue, and | |
2682 | even in prologue, non-prologue instructions (not tracked) may overwrite | |
2683 | RA or any register it was copied to. If likely in prologue or before | |
2684 | any call, use retracking info and hope for the best (compiler should | |
2685 | have saved RA in stack if not in a leaf function). If not in prologue, | |
2686 | too bad. */ | |
bdb4c075 MG |
2687 | |
2688 | int i; | |
1448a0a2 PM |
2689 | for (i = 0; |
2690 | (i < C0_NREGS) | |
2691 | && (i == C0_RA || cache->c0.c0_rt[i].fr_reg != C0_RA); | |
bdb4c075 MG |
2692 | ++i); |
2693 | if (i >= C0_NREGS && cache->c0.c0_rt[C0_RA].fr_reg == C0_RA) | |
2694 | i = C0_RA; | |
5142f611 | 2695 | if (i < C0_NREGS) |
bdb4c075 | 2696 | { |
5142f611 MG |
2697 | ra = get_frame_register_unsigned |
2698 | (this_frame, | |
2699 | gdbarch_tdep (gdbarch)->a0_base + cache->c0.c0_rt[i].fr_reg); | |
bdb4c075 MG |
2700 | } |
2701 | else ra = 0; | |
2702 | } | |
2703 | ||
dbab50de | 2704 | finish_frame_analysis: |
bdb4c075 MG |
2705 | cache->pc = start_pc; |
2706 | cache->ra = ra; | |
2707 | /* RA == 0 marks the outermost frame. Do not go past it. */ | |
2708 | cache->prev_sp = (ra != 0) ? prev_sp : 0; | |
2709 | cache->c0.fp_regnum = fp_regnum; | |
2710 | cache->c0.c0_frmsz = c0_frmsz; | |
2711 | cache->c0.c0_hasfp = c0_hasfp; | |
2712 | cache->c0.c0_fp = fp; | |
2713 | } | |
2714 | ||
08b9c608 MG |
2715 | static CORE_ADDR a0_saved; |
2716 | static CORE_ADDR a7_saved; | |
2717 | static CORE_ADDR a11_saved; | |
2718 | static int a0_was_saved; | |
2719 | static int a7_was_saved; | |
2720 | static int a11_was_saved; | |
2721 | ||
68d6df83 | 2722 | /* Simulate L32E instruction: AT <-- ref (AS + offset). */ |
08b9c608 MG |
2723 | static void |
2724 | execute_l32e (struct gdbarch *gdbarch, int at, int as, int offset, CORE_ADDR wb) | |
2725 | { | |
2726 | int atreg = arreg_number (gdbarch, gdbarch_tdep (gdbarch)->a0_base + at, wb); | |
2727 | int asreg = arreg_number (gdbarch, gdbarch_tdep (gdbarch)->a0_base + as, wb); | |
2728 | CORE_ADDR addr = xtensa_read_register (asreg) + offset; | |
2729 | unsigned int spilled_value | |
2730 | = read_memory_unsigned_integer (addr, 4, gdbarch_byte_order (gdbarch)); | |
2731 | ||
2732 | if ((at == 0) && !a0_was_saved) | |
2733 | { | |
2734 | a0_saved = xtensa_read_register (atreg); | |
2735 | a0_was_saved = 1; | |
2736 | } | |
2737 | else if ((at == 7) && !a7_was_saved) | |
2738 | { | |
2739 | a7_saved = xtensa_read_register (atreg); | |
2740 | a7_was_saved = 1; | |
2741 | } | |
2742 | else if ((at == 11) && !a11_was_saved) | |
2743 | { | |
2744 | a11_saved = xtensa_read_register (atreg); | |
2745 | a11_was_saved = 1; | |
2746 | } | |
2747 | ||
2748 | xtensa_write_register (atreg, spilled_value); | |
2749 | } | |
2750 | ||
68d6df83 | 2751 | /* Simulate S32E instruction: AT --> ref (AS + offset). */ |
08b9c608 MG |
2752 | static void |
2753 | execute_s32e (struct gdbarch *gdbarch, int at, int as, int offset, CORE_ADDR wb) | |
2754 | { | |
2755 | int atreg = arreg_number (gdbarch, gdbarch_tdep (gdbarch)->a0_base + at, wb); | |
2756 | int asreg = arreg_number (gdbarch, gdbarch_tdep (gdbarch)->a0_base + as, wb); | |
2757 | CORE_ADDR addr = xtensa_read_register (asreg) + offset; | |
2758 | ULONGEST spilled_value = xtensa_read_register (atreg); | |
2759 | ||
2760 | write_memory_unsigned_integer (addr, 4, | |
2761 | gdbarch_byte_order (gdbarch), | |
2762 | spilled_value); | |
2763 | } | |
2764 | ||
2765 | #define XTENSA_MAX_WINDOW_INTERRUPT_HANDLER_LEN 200 | |
2766 | ||
68d6df83 MG |
2767 | typedef enum |
2768 | { | |
08b9c608 MG |
2769 | xtWindowOverflow, |
2770 | xtWindowUnderflow, | |
2771 | xtNoExceptionHandler | |
2772 | } xtensa_exception_handler_t; | |
2773 | ||
68d6df83 | 2774 | /* Execute instruction stream from current PC until hitting RFWU or RFWO. |
08b9c608 MG |
2775 | Return type of Xtensa Window Interrupt Handler on success. */ |
2776 | static xtensa_exception_handler_t | |
2777 | execute_code (struct gdbarch *gdbarch, CORE_ADDR current_pc, CORE_ADDR wb) | |
2778 | { | |
2779 | xtensa_isa isa; | |
2780 | xtensa_insnbuf ins, slot; | |
948f8e3d | 2781 | gdb_byte ibuf[XTENSA_ISA_BSZ]; |
08b9c608 MG |
2782 | CORE_ADDR ia, bt, ba; |
2783 | xtensa_format ifmt; | |
2784 | int ilen, islots, is; | |
2785 | xtensa_opcode opc; | |
2786 | int insn_num = 0; | |
08b9c608 MG |
2787 | void (*func) (struct gdbarch *, int, int, int, CORE_ADDR); |
2788 | ||
19afdd07 | 2789 | uint32_t at, as, offset; |
08b9c608 MG |
2790 | |
2791 | /* WindowUnderflow12 = true, when inside _WindowUnderflow12. */ | |
2792 | int WindowUnderflow12 = (current_pc & 0x1ff) >= 0x140; | |
2793 | ||
2794 | isa = xtensa_default_isa; | |
2795 | gdb_assert (XTENSA_ISA_BSZ >= xtensa_isa_maxlength (isa)); | |
2796 | ins = xtensa_insnbuf_alloc (isa); | |
2797 | slot = xtensa_insnbuf_alloc (isa); | |
2798 | ba = 0; | |
2799 | ia = current_pc; | |
2800 | bt = ia; | |
2801 | ||
2802 | a0_was_saved = 0; | |
2803 | a7_was_saved = 0; | |
2804 | a11_was_saved = 0; | |
2805 | ||
2806 | while (insn_num++ < XTENSA_MAX_WINDOW_INTERRUPT_HANDLER_LEN) | |
2807 | { | |
2808 | if (ia + xtensa_isa_maxlength (isa) > bt) | |
2809 | { | |
2810 | ba = ia; | |
2811 | bt = (ba + XTENSA_ISA_BSZ); | |
2812 | if (target_read_memory (ba, ibuf, bt - ba) != 0) | |
2813 | return xtNoExceptionHandler; | |
2814 | } | |
2815 | xtensa_insnbuf_from_chars (isa, ins, &ibuf[ia-ba], 0); | |
2816 | ifmt = xtensa_format_decode (isa, ins); | |
2817 | if (ifmt == XTENSA_UNDEFINED) | |
2818 | return xtNoExceptionHandler; | |
2819 | ilen = xtensa_format_length (isa, ifmt); | |
2820 | if (ilen == XTENSA_UNDEFINED) | |
2821 | return xtNoExceptionHandler; | |
2822 | islots = xtensa_format_num_slots (isa, ifmt); | |
2823 | if (islots == XTENSA_UNDEFINED) | |
2824 | return xtNoExceptionHandler; | |
2825 | for (is = 0; is < islots; ++is) | |
2826 | { | |
2827 | if (xtensa_format_get_slot (isa, ifmt, is, ins, slot)) | |
2828 | return xtNoExceptionHandler; | |
2829 | opc = xtensa_opcode_decode (isa, ifmt, is, slot); | |
2830 | if (opc == XTENSA_UNDEFINED) | |
2831 | return xtNoExceptionHandler; | |
2832 | switch (call0_classify_opcode (isa, opc)) | |
2833 | { | |
2834 | case c0opc_illegal: | |
2835 | case c0opc_flow: | |
2836 | case c0opc_entry: | |
2837 | case c0opc_break: | |
2838 | /* We expect none of them here. */ | |
2839 | return xtNoExceptionHandler; | |
2840 | case c0opc_l32e: | |
2841 | func = execute_l32e; | |
2842 | break; | |
2843 | case c0opc_s32e: | |
2844 | func = execute_s32e; | |
2845 | break; | |
2846 | case c0opc_rfwo: /* RFWO. */ | |
2847 | /* Here, we return from WindowOverflow handler and, | |
2848 | if we stopped at the very beginning, which means | |
2849 | A0 was saved, we have to restore it now. */ | |
2850 | if (a0_was_saved) | |
2851 | { | |
2852 | int arreg = arreg_number (gdbarch, | |
2853 | gdbarch_tdep (gdbarch)->a0_base, | |
2854 | wb); | |
2855 | xtensa_write_register (arreg, a0_saved); | |
2856 | } | |
2857 | return xtWindowOverflow; | |
2858 | case c0opc_rfwu: /* RFWU. */ | |
2859 | /* Here, we return from WindowUnderflow handler. | |
2860 | Let's see if either A7 or A11 has to be restored. */ | |
2861 | if (WindowUnderflow12) | |
2862 | { | |
2863 | if (a11_was_saved) | |
2864 | { | |
2865 | int arreg = arreg_number (gdbarch, | |
2866 | gdbarch_tdep (gdbarch)->a0_base + 11, | |
2867 | wb); | |
2868 | xtensa_write_register (arreg, a11_saved); | |
2869 | } | |
2870 | } | |
2871 | else if (a7_was_saved) | |
2872 | { | |
2873 | int arreg = arreg_number (gdbarch, | |
2874 | gdbarch_tdep (gdbarch)->a0_base + 7, | |
2875 | wb); | |
2876 | xtensa_write_register (arreg, a7_saved); | |
2877 | } | |
2878 | return xtWindowUnderflow; | |
2879 | default: /* Simply skip this insns. */ | |
2880 | continue; | |
2881 | } | |
2882 | ||
2883 | /* Decode arguments for L32E / S32E and simulate their execution. */ | |
2884 | if ( xtensa_opcode_num_operands (isa, opc) != 3 ) | |
2885 | return xtNoExceptionHandler; | |
2886 | if (xtensa_operand_get_field (isa, opc, 0, ifmt, is, slot, &at)) | |
2887 | return xtNoExceptionHandler; | |
2888 | if (xtensa_operand_decode (isa, opc, 0, &at)) | |
2889 | return xtNoExceptionHandler; | |
2890 | if (xtensa_operand_get_field (isa, opc, 1, ifmt, is, slot, &as)) | |
2891 | return xtNoExceptionHandler; | |
2892 | if (xtensa_operand_decode (isa, opc, 1, &as)) | |
2893 | return xtNoExceptionHandler; | |
2894 | if (xtensa_operand_get_field (isa, opc, 2, ifmt, is, slot, &offset)) | |
2895 | return xtNoExceptionHandler; | |
2896 | if (xtensa_operand_decode (isa, opc, 2, &offset)) | |
2897 | return xtNoExceptionHandler; | |
2898 | ||
2899 | (*func) (gdbarch, at, as, offset, wb); | |
2900 | } | |
2901 | ||
2902 | ia += ilen; | |
2903 | } | |
2904 | return xtNoExceptionHandler; | |
2905 | } | |
2906 | ||
2907 | /* Handle Window Overflow / Underflow exception frames. */ | |
2908 | ||
2909 | static void | |
2910 | xtensa_window_interrupt_frame_cache (struct frame_info *this_frame, | |
2911 | xtensa_frame_cache_t *cache, | |
2912 | CORE_ADDR pc) | |
2913 | { | |
2914 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
2915 | CORE_ADDR ps, wb, ws, ra; | |
2916 | int epc1_regnum, i, regnum; | |
2917 | xtensa_exception_handler_t eh_type; | |
2918 | ||
2919 | /* Read PS, WB, and WS from the hardware. Note that PS register | |
2920 | must be present, if Windowed ABI is supported. */ | |
2921 | ps = xtensa_read_register (gdbarch_ps_regnum (gdbarch)); | |
2922 | wb = xtensa_read_register (gdbarch_tdep (gdbarch)->wb_regnum); | |
2923 | ws = xtensa_read_register (gdbarch_tdep (gdbarch)->ws_regnum); | |
2924 | ||
2925 | /* Execute all the remaining instructions from Window Interrupt Handler | |
2926 | by simulating them on the remote protocol level. On return, set the | |
2927 | type of Xtensa Window Interrupt Handler, or report an error. */ | |
2928 | eh_type = execute_code (gdbarch, pc, wb); | |
2929 | if (eh_type == xtNoExceptionHandler) | |
2930 | error (_("\ | |
2931 | Unable to decode Xtensa Window Interrupt Handler's code.")); | |
2932 | ||
2933 | cache->ps = ps ^ PS_EXC; /* Clear the exception bit in PS. */ | |
2934 | cache->call0 = 0; /* It's Windowed ABI. */ | |
2935 | ||
2936 | /* All registers for the cached frame will be alive. */ | |
2937 | for (i = 0; i < XTENSA_NUM_SAVED_AREGS; i++) | |
2938 | cache->wd.aregs[i] = -1; | |
2939 | ||
2940 | if (eh_type == xtWindowOverflow) | |
2941 | cache->wd.ws = ws ^ (1 << wb); | |
2942 | else /* eh_type == xtWindowUnderflow. */ | |
2943 | cache->wd.ws = ws | (1 << wb); | |
2944 | ||
2945 | cache->wd.wb = (ps & 0xf00) >> 8; /* Set WB to OWB. */ | |
2946 | regnum = arreg_number (gdbarch, gdbarch_tdep (gdbarch)->a0_base, | |
2947 | cache->wd.wb); | |
2948 | ra = xtensa_read_register (regnum); | |
2949 | cache->wd.callsize = WINSIZE (ra); | |
2950 | cache->prev_sp = xtensa_read_register (regnum + 1); | |
2951 | /* Set regnum to a frame pointer of the frame being cached. */ | |
2952 | regnum = xtensa_scan_prologue (gdbarch, pc); | |
2953 | regnum = arreg_number (gdbarch, | |
2954 | gdbarch_tdep (gdbarch)->a0_base + regnum, | |
2955 | cache->wd.wb); | |
2956 | cache->base = get_frame_register_unsigned (this_frame, regnum); | |
2957 | ||
2958 | /* Read PC of interrupted function from EPC1 register. */ | |
2959 | epc1_regnum = xtensa_find_register_by_name (gdbarch,"epc1"); | |
2960 | if (epc1_regnum < 0) | |
2961 | error(_("Unable to read Xtensa register EPC1")); | |
2962 | cache->ra = xtensa_read_register (epc1_regnum); | |
2963 | cache->pc = get_frame_func (this_frame); | |
2964 | } | |
2965 | ||
bdb4c075 MG |
2966 | |
2967 | /* Skip function prologue. | |
2968 | ||
2969 | Return the pc of the first instruction after prologue. GDB calls this to | |
2970 | find the address of the first line of the function or (if there is no line | |
2971 | number information) to skip the prologue for planting breakpoints on | |
2972 | function entries. Use debug info (if present) or prologue analysis to skip | |
2973 | the prologue to achieve reliable debugging behavior. For windowed ABI, | |
2974 | only the 'entry' instruction is skipped. It is not strictly necessary to | |
2975 | skip the prologue (Call0) or 'entry' (Windowed) because xt-gdb knows how to | |
2976 | backtrace at any point in the prologue, however certain potential hazards | |
2977 | are avoided and a more "normal" debugging experience is ensured by | |
2978 | skipping the prologue (can be disabled by defining DONT_SKIP_PROLOG). | |
2979 | For example, if we don't skip the prologue: | |
2980 | - Some args may not yet have been saved to the stack where the debug | |
2981 | info expects to find them (true anyway when only 'entry' is skipped); | |
2982 | - Software breakpoints ('break' instrs) may not have been unplanted | |
2983 | when the prologue analysis is done on initializing the frame cache, | |
2984 | and breaks in the prologue will throw off the analysis. | |
ca3bf3bd DJ |
2985 | |
2986 | If we have debug info ( line-number info, in particular ) we simply skip | |
2987 | the code associated with the first function line effectively skipping | |
bdb4c075 | 2988 | the prologue code. It works even in cases like |
ca3bf3bd DJ |
2989 | |
2990 | int main() | |
2991 | { int local_var = 1; | |
2992 | .... | |
2993 | } | |
2994 | ||
2995 | because, for this source code, both Xtensa compilers will generate two | |
2996 | separate entries ( with the same line number ) in dwarf line-number | |
2997 | section to make sure there is a boundary between the prologue code and | |
2998 | the rest of the function. | |
2999 | ||
bdb4c075 MG |
3000 | If there is no debug info, we need to analyze the code. */ |
3001 | ||
3002 | /* #define DONT_SKIP_PROLOGUE */ | |
ca3bf3bd | 3003 | |
63807e1d | 3004 | static CORE_ADDR |
6093d2eb | 3005 | xtensa_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR start_pc) |
ca3bf3bd | 3006 | { |
bdb4c075 MG |
3007 | struct symtab_and_line prologue_sal; |
3008 | CORE_ADDR body_pc; | |
3009 | ||
ca3bf3bd DJ |
3010 | DEBUGTRACE ("xtensa_skip_prologue (start_pc = 0x%08x)\n", (int) start_pc); |
3011 | ||
bdb4c075 MG |
3012 | #if DONT_SKIP_PROLOGUE |
3013 | return start_pc; | |
3014 | #endif | |
3015 | ||
3016 | /* Try to find first body line from debug info. */ | |
3017 | ||
3018 | prologue_sal = find_pc_line (start_pc, 0); | |
3019 | if (prologue_sal.line != 0) /* Found debug info. */ | |
ca3bf3bd | 3020 | { |
f976a05d MG |
3021 | /* In Call0, it is possible to have a function with only one instruction |
3022 | ('ret') resulting from a one-line optimized function that does nothing. | |
3023 | In that case, prologue_sal.end may actually point to the start of the | |
3024 | next function in the text section, causing a breakpoint to be set at | |
3025 | the wrong place. Check, if the end address is within a different | |
3026 | function, and if so return the start PC. We know we have symbol | |
3027 | information. */ | |
ca3bf3bd | 3028 | |
bdb4c075 MG |
3029 | CORE_ADDR end_func; |
3030 | ||
f976a05d MG |
3031 | if ((gdbarch_tdep (gdbarch)->call_abi == CallAbiCall0Only) |
3032 | && call0_ret (start_pc, prologue_sal.end)) | |
3033 | return start_pc; | |
3034 | ||
bdb4c075 MG |
3035 | find_pc_partial_function (prologue_sal.end, NULL, &end_func, NULL); |
3036 | if (end_func != start_pc) | |
ca3bf3bd DJ |
3037 | return start_pc; |
3038 | ||
bdb4c075 | 3039 | return prologue_sal.end; |
ca3bf3bd | 3040 | } |
ca3bf3bd | 3041 | |
bdb4c075 | 3042 | /* No debug line info. Analyze prologue for Call0 or simply skip ENTRY. */ |
dbab50de MG |
3043 | body_pc = call0_analyze_prologue (gdbarch, start_pc, 0, 0, |
3044 | xtensa_alloc_frame_cache (0)); | |
bdb4c075 MG |
3045 | return body_pc != 0 ? body_pc : start_pc; |
3046 | } | |
ca3bf3bd DJ |
3047 | |
3048 | /* Verify the current configuration. */ | |
ca3bf3bd DJ |
3049 | static void |
3050 | xtensa_verify_config (struct gdbarch *gdbarch) | |
3051 | { | |
d7e74731 PA |
3052 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
3053 | string_file log; | |
ca3bf3bd DJ |
3054 | |
3055 | /* Verify that we got a reasonable number of AREGS. */ | |
3056 | if ((tdep->num_aregs & -tdep->num_aregs) != tdep->num_aregs) | |
d7e74731 | 3057 | log.printf (_("\ |
bdb4c075 | 3058 | \n\tnum_aregs: Number of AR registers (%d) is not a power of two!"), |
d7e74731 | 3059 | tdep->num_aregs); |
ca3bf3bd DJ |
3060 | |
3061 | /* Verify that certain registers exist. */ | |
bdb4c075 | 3062 | |
ca3bf3bd | 3063 | if (tdep->pc_regnum == -1) |
d7e74731 | 3064 | log.printf (_("\n\tpc_regnum: No PC register")); |
bdb4c075 | 3065 | if (tdep->isa_use_exceptions && tdep->ps_regnum == -1) |
d7e74731 | 3066 | log.printf (_("\n\tps_regnum: No PS register")); |
bdb4c075 MG |
3067 | |
3068 | if (tdep->isa_use_windowed_registers) | |
3069 | { | |
3070 | if (tdep->wb_regnum == -1) | |
d7e74731 | 3071 | log.printf (_("\n\twb_regnum: No WB register")); |
bdb4c075 | 3072 | if (tdep->ws_regnum == -1) |
d7e74731 | 3073 | log.printf (_("\n\tws_regnum: No WS register")); |
bdb4c075 | 3074 | if (tdep->ar_base == -1) |
d7e74731 | 3075 | log.printf (_("\n\tar_base: No AR registers")); |
bdb4c075 MG |
3076 | } |
3077 | ||
ca3bf3bd | 3078 | if (tdep->a0_base == -1) |
d7e74731 | 3079 | log.printf (_("\n\ta0_base: No Ax registers")); |
ca3bf3bd | 3080 | |
d7e74731 | 3081 | if (!log.empty ()) |
ca3bf3bd | 3082 | internal_error (__FILE__, __LINE__, |
d7e74731 | 3083 | _("the following are invalid: %s"), log.c_str ()); |
ca3bf3bd DJ |
3084 | } |
3085 | ||
94a0e877 MG |
3086 | |
3087 | /* Derive specific register numbers from the array of registers. */ | |
3088 | ||
63807e1d | 3089 | static void |
94a0e877 MG |
3090 | xtensa_derive_tdep (struct gdbarch_tdep *tdep) |
3091 | { | |
3092 | xtensa_register_t* rmap; | |
3093 | int n, max_size = 4; | |
3094 | ||
3095 | tdep->num_regs = 0; | |
3096 | tdep->num_nopriv_regs = 0; | |
3097 | ||
3098 | /* Special registers 0..255 (core). */ | |
3099 | #define XTENSA_DBREGN_SREG(n) (0x0200+(n)) | |
f74f865e MF |
3100 | /* User registers 0..255. */ |
3101 | #define XTENSA_DBREGN_UREG(n) (0x0300+(n)) | |
94a0e877 MG |
3102 | |
3103 | for (rmap = tdep->regmap, n = 0; rmap->target_number != -1; n++, rmap++) | |
3104 | { | |
3105 | if (rmap->target_number == 0x0020) | |
3106 | tdep->pc_regnum = n; | |
3107 | else if (rmap->target_number == 0x0100) | |
3108 | tdep->ar_base = n; | |
3109 | else if (rmap->target_number == 0x0000) | |
3110 | tdep->a0_base = n; | |
3111 | else if (rmap->target_number == XTENSA_DBREGN_SREG(72)) | |
3112 | tdep->wb_regnum = n; | |
3113 | else if (rmap->target_number == XTENSA_DBREGN_SREG(73)) | |
3114 | tdep->ws_regnum = n; | |
3115 | else if (rmap->target_number == XTENSA_DBREGN_SREG(233)) | |
3116 | tdep->debugcause_regnum = n; | |
3117 | else if (rmap->target_number == XTENSA_DBREGN_SREG(232)) | |
3118 | tdep->exccause_regnum = n; | |
3119 | else if (rmap->target_number == XTENSA_DBREGN_SREG(238)) | |
3120 | tdep->excvaddr_regnum = n; | |
3121 | else if (rmap->target_number == XTENSA_DBREGN_SREG(0)) | |
3122 | tdep->lbeg_regnum = n; | |
3123 | else if (rmap->target_number == XTENSA_DBREGN_SREG(1)) | |
3124 | tdep->lend_regnum = n; | |
3125 | else if (rmap->target_number == XTENSA_DBREGN_SREG(2)) | |
3126 | tdep->lcount_regnum = n; | |
3127 | else if (rmap->target_number == XTENSA_DBREGN_SREG(3)) | |
3128 | tdep->sar_regnum = n; | |
3129 | else if (rmap->target_number == XTENSA_DBREGN_SREG(5)) | |
3130 | tdep->litbase_regnum = n; | |
3131 | else if (rmap->target_number == XTENSA_DBREGN_SREG(230)) | |
3132 | tdep->ps_regnum = n; | |
f74f865e MF |
3133 | else if (rmap->target_number == XTENSA_DBREGN_UREG(231)) |
3134 | tdep->threadptr_regnum = n; | |
94a0e877 MG |
3135 | #if 0 |
3136 | else if (rmap->target_number == XTENSA_DBREGN_SREG(226)) | |
3137 | tdep->interrupt_regnum = n; | |
3138 | else if (rmap->target_number == XTENSA_DBREGN_SREG(227)) | |
3139 | tdep->interrupt2_regnum = n; | |
3140 | else if (rmap->target_number == XTENSA_DBREGN_SREG(224)) | |
3141 | tdep->cpenable_regnum = n; | |
3142 | #endif | |
3143 | ||
3144 | if (rmap->byte_size > max_size) | |
3145 | max_size = rmap->byte_size; | |
3146 | if (rmap->mask != 0 && tdep->num_regs == 0) | |
3147 | tdep->num_regs = n; | |
3148 | /* Find out out how to deal with priveleged registers. | |
3149 | ||
3150 | if ((rmap->flags & XTENSA_REGISTER_FLAGS_PRIVILEGED) != 0 | |
3151 | && tdep->num_nopriv_regs == 0) | |
3152 | tdep->num_nopriv_regs = n; | |
3153 | */ | |
3154 | if ((rmap->flags & XTENSA_REGISTER_FLAGS_PRIVILEGED) != 0 | |
3155 | && tdep->num_regs == 0) | |
3156 | tdep->num_regs = n; | |
3157 | } | |
3158 | ||
3159 | /* Number of pseudo registers. */ | |
3160 | tdep->num_pseudo_regs = n - tdep->num_regs; | |
3161 | ||
3162 | /* Empirically determined maximum sizes. */ | |
3163 | tdep->max_register_raw_size = max_size; | |
3164 | tdep->max_register_virtual_size = max_size; | |
3165 | } | |
3166 | ||
ca3bf3bd DJ |
3167 | /* Module "constructor" function. */ |
3168 | ||
94a0e877 MG |
3169 | extern struct gdbarch_tdep xtensa_tdep; |
3170 | ||
ca3bf3bd DJ |
3171 | static struct gdbarch * |
3172 | xtensa_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) | |
3173 | { | |
3174 | struct gdbarch_tdep *tdep; | |
3175 | struct gdbarch *gdbarch; | |
ca3bf3bd DJ |
3176 | |
3177 | DEBUGTRACE ("gdbarch_init()\n"); | |
3178 | ||
a4398628 MF |
3179 | if (!xtensa_default_isa) |
3180 | xtensa_default_isa = xtensa_isa_init (0, 0); | |
3181 | ||
ca3bf3bd | 3182 | /* We have to set the byte order before we call gdbarch_alloc. */ |
94a0e877 | 3183 | info.byte_order = XCHAL_HAVE_BE ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; |
ca3bf3bd | 3184 | |
94a0e877 | 3185 | tdep = &xtensa_tdep; |
ca3bf3bd | 3186 | gdbarch = gdbarch_alloc (&info, tdep); |
94a0e877 | 3187 | xtensa_derive_tdep (tdep); |
ca3bf3bd DJ |
3188 | |
3189 | /* Verify our configuration. */ | |
3190 | xtensa_verify_config (gdbarch); | |
dbab50de | 3191 | xtensa_session_once_reported = 0; |
ca3bf3bd | 3192 | |
53375380 PA |
3193 | set_gdbarch_wchar_bit (gdbarch, 2 * TARGET_CHAR_BIT); |
3194 | set_gdbarch_wchar_signed (gdbarch, 0); | |
3195 | ||
bdb4c075 | 3196 | /* Pseudo-Register read/write. */ |
ca3bf3bd DJ |
3197 | set_gdbarch_pseudo_register_read (gdbarch, xtensa_pseudo_register_read); |
3198 | set_gdbarch_pseudo_register_write (gdbarch, xtensa_pseudo_register_write); | |
3199 | ||
3200 | /* Set target information. */ | |
3201 | set_gdbarch_num_regs (gdbarch, tdep->num_regs); | |
3202 | set_gdbarch_num_pseudo_regs (gdbarch, tdep->num_pseudo_regs); | |
3203 | set_gdbarch_sp_regnum (gdbarch, tdep->a0_base + 1); | |
3204 | set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum); | |
3205 | set_gdbarch_ps_regnum (gdbarch, tdep->ps_regnum); | |
3206 | ||
ba2b1c56 | 3207 | /* Renumber registers for known formats (stabs and dwarf2). */ |
ca3bf3bd | 3208 | set_gdbarch_stab_reg_to_regnum (gdbarch, xtensa_reg_to_regnum); |
ca3bf3bd DJ |
3209 | set_gdbarch_dwarf2_reg_to_regnum (gdbarch, xtensa_reg_to_regnum); |
3210 | ||
3211 | /* We provide our own function to get register information. */ | |
3212 | set_gdbarch_register_name (gdbarch, xtensa_register_name); | |
3213 | set_gdbarch_register_type (gdbarch, xtensa_register_type); | |
3214 | ||
581e13c1 | 3215 | /* To call functions from GDB using dummy frame. */ |
ca3bf3bd DJ |
3216 | set_gdbarch_push_dummy_call (gdbarch, xtensa_push_dummy_call); |
3217 | ||
3218 | set_gdbarch_believe_pcc_promotion (gdbarch, 1); | |
3219 | ||
3220 | set_gdbarch_return_value (gdbarch, xtensa_return_value); | |
3221 | ||
3222 | /* Advance PC across any prologue instructions to reach "real" code. */ | |
3223 | set_gdbarch_skip_prologue (gdbarch, xtensa_skip_prologue); | |
3224 | ||
3225 | /* Stack grows downward. */ | |
3226 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); | |
3227 | ||
3228 | /* Set breakpoints. */ | |
04180708 YQ |
3229 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
3230 | xtensa_breakpoint_kind_from_pc); | |
3231 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, | |
3232 | xtensa_sw_breakpoint_from_kind); | |
ca3bf3bd DJ |
3233 | |
3234 | /* After breakpoint instruction or illegal instruction, pc still | |
3235 | points at break instruction, so don't decrement. */ | |
3236 | set_gdbarch_decr_pc_after_break (gdbarch, 0); | |
3237 | ||
3238 | /* We don't skip args. */ | |
3239 | set_gdbarch_frame_args_skip (gdbarch, 0); | |
3240 | ||
3241 | set_gdbarch_unwind_pc (gdbarch, xtensa_unwind_pc); | |
3242 | ||
3243 | set_gdbarch_frame_align (gdbarch, xtensa_frame_align); | |
3244 | ||
5142f611 | 3245 | set_gdbarch_dummy_id (gdbarch, xtensa_dummy_id); |
ca3bf3bd DJ |
3246 | |
3247 | /* Frame handling. */ | |
3248 | frame_base_set_default (gdbarch, &xtensa_frame_base); | |
5142f611 MG |
3249 | frame_unwind_append_unwinder (gdbarch, &xtensa_unwind); |
3250 | dwarf2_append_unwinders (gdbarch); | |
ca3bf3bd | 3251 | |
ca3bf3bd DJ |
3252 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); |
3253 | ||
3254 | xtensa_add_reggroups (gdbarch); | |
3255 | set_gdbarch_register_reggroup_p (gdbarch, xtensa_register_reggroup_p); | |
3256 | ||
97094034 AA |
3257 | set_gdbarch_iterate_over_regset_sections |
3258 | (gdbarch, xtensa_iterate_over_regset_sections); | |
ca3bf3bd | 3259 | |
ee967b5f MG |
3260 | set_solib_svr4_fetch_link_map_offsets |
3261 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
3262 | ||
40045d91 MF |
3263 | /* Hook in the ABI-specific overrides, if they have been registered. */ |
3264 | gdbarch_init_osabi (info, gdbarch); | |
3265 | ||
ca3bf3bd DJ |
3266 | return gdbarch; |
3267 | } | |
3268 | ||
ca3bf3bd | 3269 | static void |
6b50c0b0 | 3270 | xtensa_dump_tdep (struct gdbarch *gdbarch, struct ui_file *file) |
ca3bf3bd DJ |
3271 | { |
3272 | error (_("xtensa_dump_tdep(): not implemented")); | |
3273 | } | |
3274 | ||
ca3bf3bd DJ |
3275 | void |
3276 | _initialize_xtensa_tdep (void) | |
3277 | { | |
ca3bf3bd DJ |
3278 | gdbarch_register (bfd_arch_xtensa, xtensa_gdbarch_init, xtensa_dump_tdep); |
3279 | xtensa_init_reggroups (); | |
3280 | ||
ccce17b0 YQ |
3281 | add_setshow_zuinteger_cmd ("xtensa", |
3282 | class_maintenance, | |
3283 | &xtensa_debug_level, | |
581e13c1 MS |
3284 | _("Set Xtensa debugging."), |
3285 | _("Show Xtensa debugging."), _("\ | |
ca3bf3bd DJ |
3286 | When non-zero, Xtensa-specific debugging is enabled. \ |
3287 | Can be 1, 2, 3, or 4 indicating the level of debugging."), | |
ccce17b0 YQ |
3288 | NULL, |
3289 | NULL, | |
3290 | &setdebuglist, &showdebuglist); | |
ca3bf3bd | 3291 | } |