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f46e4eb7 JB |
1 | /* Simulator for the FT32 processor |
2 | ||
618f726f | 3 | Copyright (C) 2008-2016 Free Software Foundation, Inc. |
f46e4eb7 JB |
4 | Contributed by FTDI <support@ftdichip.com> |
5 | ||
6 | This file is part of simulators. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include <fcntl.h> | |
23 | #include <signal.h> | |
24 | #include <stdlib.h> | |
25 | #include <stdint.h> | |
26 | ||
27 | #include "bfd.h" | |
28 | #include "gdb/callback.h" | |
29 | #include "libiberty.h" | |
30 | #include "gdb/remote-sim.h" | |
31 | ||
32 | #include "sim-main.h" | |
33 | #include "sim-options.h" | |
34 | ||
35 | #include "opcode/ft32.h" | |
36 | ||
37 | /* | |
38 | * FT32 is a Harvard architecture: RAM and code occupy | |
39 | * different address spaces. | |
40 | * | |
41 | * sim and gdb model FT32 memory by adding 0x800000 to RAM | |
42 | * addresses. This means that sim/gdb can treat all addresses | |
43 | * similarly. | |
44 | * | |
45 | * The address space looks like: | |
46 | * | |
47 | * 00000 start of code memory | |
48 | * 3ffff end of code memory | |
49 | * 800000 start of RAM | |
50 | * 80ffff end of RAM | |
51 | */ | |
52 | ||
53 | #define RAM_BIAS 0x800000 /* Bias added to RAM addresses. */ | |
54 | ||
55 | static unsigned long | |
56 | ft32_extract_unsigned_integer (unsigned char *addr, int len) | |
57 | { | |
58 | unsigned long retval; | |
59 | unsigned char *p; | |
60 | unsigned char *startaddr = (unsigned char *) addr; | |
61 | unsigned char *endaddr = startaddr + len; | |
62 | ||
63 | /* Start at the most significant end of the integer, and work towards | |
64 | the least significant. */ | |
65 | retval = 0; | |
66 | ||
67 | for (p = endaddr; p > startaddr;) | |
68 | retval = (retval << 8) | * -- p; | |
69 | ||
70 | return retval; | |
71 | } | |
72 | ||
73 | static void | |
74 | ft32_store_unsigned_integer (unsigned char *addr, int len, unsigned long val) | |
75 | { | |
76 | unsigned char *p; | |
77 | unsigned char *startaddr = (unsigned char *)addr; | |
78 | unsigned char *endaddr = startaddr + len; | |
79 | ||
80 | for (p = startaddr; p < endaddr; p++) | |
81 | { | |
82 | *p = val & 0xff; | |
83 | val >>= 8; | |
84 | } | |
85 | } | |
86 | ||
87 | /* | |
88 | * Align EA according to its size DW. | |
89 | * The FT32 ignores the low bit of a 16-bit addresss, | |
90 | * and the low two bits of a 32-bit address. | |
91 | */ | |
92 | static uint32_t ft32_align (uint32_t dw, uint32_t ea) | |
93 | { | |
94 | switch (dw) | |
95 | { | |
96 | case 1: | |
97 | ea &= ~1; | |
98 | break; | |
99 | case 2: | |
100 | ea &= ~3; | |
101 | break; | |
102 | default: | |
103 | break; | |
104 | } | |
105 | return ea; | |
106 | } | |
107 | ||
108 | /* Read an item from memory address EA, sized DW. */ | |
109 | static uint32_t | |
110 | ft32_read_item (SIM_DESC sd, int dw, uint32_t ea) | |
111 | { | |
112 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
034685f9 | 113 | address_word cia = CPU_PC_GET (cpu); |
f46e4eb7 JB |
114 | uint8_t byte[4]; |
115 | uint32_t r; | |
116 | ||
117 | ea = ft32_align (dw, ea); | |
118 | ||
119 | switch (dw) { | |
120 | case 0: | |
121 | return sim_core_read_aligned_1 (cpu, cia, read_map, ea); | |
122 | case 1: | |
123 | return sim_core_read_aligned_2 (cpu, cia, read_map, ea); | |
124 | case 2: | |
125 | return sim_core_read_aligned_4 (cpu, cia, read_map, ea); | |
126 | default: | |
127 | abort (); | |
128 | } | |
129 | } | |
130 | ||
131 | /* Write item V to memory address EA, sized DW. */ | |
132 | static void | |
133 | ft32_write_item (SIM_DESC sd, int dw, uint32_t ea, uint32_t v) | |
134 | { | |
135 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
034685f9 | 136 | address_word cia = CPU_PC_GET (cpu); |
f46e4eb7 JB |
137 | uint8_t byte[4]; |
138 | ||
139 | ea = ft32_align (dw, ea); | |
140 | ||
141 | switch (dw) { | |
142 | case 0: | |
143 | sim_core_write_aligned_1 (cpu, cia, write_map, ea, v); | |
144 | break; | |
145 | case 1: | |
146 | sim_core_write_aligned_2 (cpu, cia, write_map, ea, v); | |
147 | break; | |
148 | case 2: | |
149 | sim_core_write_aligned_4 (cpu, cia, write_map, ea, v); | |
150 | break; | |
151 | default: | |
152 | abort (); | |
153 | } | |
154 | } | |
155 | ||
156 | #define ILLEGAL() \ | |
157 | sim_engine_halt (sd, cpu, NULL, insnpc, sim_signalled, SIM_SIGILL) | |
158 | ||
159 | static uint32_t cpu_mem_read (SIM_DESC sd, uint32_t dw, uint32_t ea) | |
160 | { | |
161 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
162 | uint32_t insnpc = cpu->state.pc; | |
163 | uint32_t r; | |
164 | uint8_t byte[4]; | |
165 | ||
166 | ea &= 0x1ffff; | |
167 | if (ea & ~0xffff) | |
168 | { | |
169 | /* Simulate some IO devices */ | |
170 | switch (ea) | |
171 | { | |
bcd68f9e JB |
172 | case 0x10000: |
173 | return getchar (); | |
f46e4eb7 JB |
174 | case 0x1fff4: |
175 | /* Read the simulator cycle timer. */ | |
176 | return cpu->state.cycles / 100; | |
177 | default: | |
178 | sim_io_eprintf (sd, "Illegal IO read address %08x, pc %#x\n", | |
179 | ea, insnpc); | |
180 | ILLEGAL (); | |
181 | } | |
182 | } | |
183 | return ft32_read_item (sd, dw, RAM_BIAS + ea); | |
184 | } | |
185 | ||
186 | static void cpu_mem_write (SIM_DESC sd, uint32_t dw, uint32_t ea, uint32_t d) | |
187 | { | |
188 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
189 | ea &= 0x1ffff; | |
190 | if (ea & 0x10000) | |
191 | { | |
192 | /* Simulate some IO devices */ | |
193 | switch (ea) | |
194 | { | |
195 | case 0x10000: | |
196 | /* Console output */ | |
197 | putchar (d & 0xff); | |
198 | break; | |
199 | case 0x1fc80: | |
200 | /* Unlock the PM write port */ | |
201 | cpu->state.pm_unlock = (d == 0x1337f7d1); | |
202 | break; | |
203 | case 0x1fc84: | |
204 | /* Set the PM write address register */ | |
205 | cpu->state.pm_addr = d; | |
206 | break; | |
207 | case 0x1fc88: | |
71c34ca7 JB |
208 | if (cpu->state.pm_unlock) |
209 | { | |
210 | /* Write to PM. */ | |
211 | ft32_write_item (sd, dw, cpu->state.pm_addr, d); | |
212 | cpu->state.pm_addr += 4; | |
213 | } | |
f46e4eb7 JB |
214 | break; |
215 | case 0x1fffc: | |
216 | /* Normal exit. */ | |
217 | sim_engine_halt (sd, cpu, NULL, cpu->state.pc, sim_exited, cpu->state.regs[0]); | |
218 | break; | |
219 | case 0x1fff8: | |
220 | sim_io_printf (sd, "Debug write %08x\n", d); | |
221 | break; | |
222 | default: | |
223 | sim_io_eprintf (sd, "Unknown IO write %08x to to %08x\n", d, ea); | |
224 | } | |
225 | } | |
226 | else | |
227 | ft32_write_item (sd, dw, RAM_BIAS + ea, d); | |
228 | } | |
229 | ||
230 | #define GET_BYTE(ea) cpu_mem_read (sd, 0, (ea)) | |
231 | #define PUT_BYTE(ea, d) cpu_mem_write (sd, 0, (ea), (d)) | |
232 | ||
233 | /* LSBS (n) is a mask of the least significant N bits. */ | |
234 | #define LSBS(n) ((1U << (n)) - 1) | |
235 | ||
236 | static void ft32_push (SIM_DESC sd, uint32_t v) | |
237 | { | |
238 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
239 | cpu->state.regs[FT32_HARD_SP] -= 4; | |
240 | cpu->state.regs[FT32_HARD_SP] &= 0xffff; | |
241 | cpu_mem_write (sd, 2, cpu->state.regs[FT32_HARD_SP], v); | |
242 | } | |
243 | ||
244 | static uint32_t ft32_pop (SIM_DESC sd) | |
245 | { | |
246 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
247 | uint32_t r = cpu_mem_read (sd, 2, cpu->state.regs[FT32_HARD_SP]); | |
248 | cpu->state.regs[FT32_HARD_SP] += 4; | |
249 | cpu->state.regs[FT32_HARD_SP] &= 0xffff; | |
250 | return r; | |
251 | } | |
252 | ||
253 | /* Extract the low SIZ bits of N as an unsigned number. */ | |
254 | static int nunsigned (int siz, int n) | |
255 | { | |
256 | return n & LSBS (siz); | |
257 | } | |
258 | ||
259 | /* Extract the low SIZ bits of N as a signed number. */ | |
260 | static int nsigned (int siz, int n) | |
261 | { | |
262 | int shift = (sizeof (int) * 8) - siz; | |
263 | return (n << shift) >> shift; | |
264 | } | |
265 | ||
266 | /* Signed division N / D, matching hw behavior for (MIN_INT, -1). */ | |
267 | static uint32_t ft32sdiv (uint32_t n, uint32_t d) | |
268 | { | |
269 | if (n == 0x80000000UL && d == 0xffffffffUL) | |
270 | return 0x80000000UL; | |
271 | else | |
272 | return (uint32_t)((int)n / (int)d); | |
273 | } | |
274 | ||
275 | /* Signed modulus N % D, matching hw behavior for (MIN_INT, -1). */ | |
276 | static uint32_t ft32smod (uint32_t n, uint32_t d) | |
277 | { | |
278 | if (n == 0x80000000UL && d == 0xffffffffUL) | |
279 | return 0; | |
280 | else | |
281 | return (uint32_t)((int)n % (int)d); | |
282 | } | |
283 | ||
284 | /* Circular rotate right N by B bits. */ | |
285 | static uint32_t ror (uint32_t n, uint32_t b) | |
286 | { | |
287 | b &= 31; | |
288 | return (n >> b) | (n << (32 - b)); | |
289 | } | |
290 | ||
291 | /* Implement the BINS machine instruction. | |
292 | See FT32 Programmer's Reference for details. */ | |
293 | static uint32_t bins (uint32_t d, uint32_t f, uint32_t len, uint32_t pos) | |
294 | { | |
295 | uint32_t bitmask = LSBS (len) << pos; | |
296 | return (d & ~bitmask) | ((f << pos) & bitmask); | |
297 | } | |
298 | ||
299 | /* Implement the FLIP machine instruction. | |
300 | See FT32 Programmer's Reference for details. */ | |
301 | static uint32_t flip (uint32_t x, uint32_t b) | |
302 | { | |
303 | if (b & 1) | |
304 | x = (x & 0x55555555) << 1 | (x & 0xAAAAAAAA) >> 1; | |
305 | if (b & 2) | |
306 | x = (x & 0x33333333) << 2 | (x & 0xCCCCCCCC) >> 2; | |
307 | if (b & 4) | |
308 | x = (x & 0x0F0F0F0F) << 4 | (x & 0xF0F0F0F0) >> 4; | |
309 | if (b & 8) | |
310 | x = (x & 0x00FF00FF) << 8 | (x & 0xFF00FF00) >> 8; | |
311 | if (b & 16) | |
312 | x = (x & 0x0000FFFF) << 16 | (x & 0xFFFF0000) >> 16; | |
313 | return x; | |
314 | } | |
315 | ||
316 | static void | |
317 | step_once (SIM_DESC sd) | |
318 | { | |
319 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
034685f9 | 320 | address_word cia = CPU_PC_GET (cpu); |
f46e4eb7 JB |
321 | uint32_t inst; |
322 | uint32_t dw; | |
323 | uint32_t cb; | |
324 | uint32_t r_d; | |
325 | uint32_t cr; | |
326 | uint32_t cv; | |
327 | uint32_t bt; | |
328 | uint32_t r_1; | |
329 | uint32_t rimm; | |
330 | uint32_t r_2; | |
331 | uint32_t k20; | |
332 | uint32_t pa; | |
333 | uint32_t aa; | |
334 | uint32_t k16; | |
335 | uint32_t k8; | |
336 | uint32_t al; | |
337 | uint32_t r_1v; | |
338 | uint32_t rimmv; | |
339 | uint32_t bit_pos; | |
340 | uint32_t bit_len; | |
341 | uint32_t upper; | |
342 | uint32_t insnpc; | |
343 | ||
344 | if (cpu->state.cycles >= cpu->state.next_tick_cycle) | |
345 | { | |
346 | cpu->state.next_tick_cycle += 100000; | |
347 | ft32_push (sd, cpu->state.pc); | |
348 | cpu->state.pc = 12; /* interrupt 1. */ | |
349 | } | |
350 | inst = ft32_read_item (sd, 2, cpu->state.pc); | |
351 | cpu->state.cycles += 1; | |
352 | ||
353 | /* Handle "call 8" (which is FT32's "break" equivalent) here. */ | |
354 | if (inst == 0x00340002) | |
355 | { | |
356 | sim_engine_halt (sd, cpu, NULL, | |
357 | cpu->state.pc, | |
358 | sim_stopped, SIM_SIGTRAP); | |
359 | goto escape; | |
360 | } | |
361 | ||
362 | dw = (inst >> FT32_FLD_DW_BIT) & LSBS (FT32_FLD_DW_SIZ); | |
363 | cb = (inst >> FT32_FLD_CB_BIT) & LSBS (FT32_FLD_CB_SIZ); | |
364 | r_d = (inst >> FT32_FLD_R_D_BIT) & LSBS (FT32_FLD_R_D_SIZ); | |
365 | cr = (inst >> FT32_FLD_CR_BIT) & LSBS (FT32_FLD_CR_SIZ); | |
366 | cv = (inst >> FT32_FLD_CV_BIT) & LSBS (FT32_FLD_CV_SIZ); | |
367 | bt = (inst >> FT32_FLD_BT_BIT) & LSBS (FT32_FLD_BT_SIZ); | |
368 | r_1 = (inst >> FT32_FLD_R_1_BIT) & LSBS (FT32_FLD_R_1_SIZ); | |
369 | rimm = (inst >> FT32_FLD_RIMM_BIT) & LSBS (FT32_FLD_RIMM_SIZ); | |
370 | r_2 = (inst >> FT32_FLD_R_2_BIT) & LSBS (FT32_FLD_R_2_SIZ); | |
371 | k20 = nsigned (20, (inst >> FT32_FLD_K20_BIT) & LSBS (FT32_FLD_K20_SIZ)); | |
372 | pa = (inst >> FT32_FLD_PA_BIT) & LSBS (FT32_FLD_PA_SIZ); | |
373 | aa = (inst >> FT32_FLD_AA_BIT) & LSBS (FT32_FLD_AA_SIZ); | |
374 | k16 = (inst >> FT32_FLD_K16_BIT) & LSBS (FT32_FLD_K16_SIZ); | |
375 | k8 = nsigned (8, (inst >> FT32_FLD_K8_BIT) & LSBS (FT32_FLD_K8_SIZ)); | |
376 | al = (inst >> FT32_FLD_AL_BIT) & LSBS (FT32_FLD_AL_SIZ); | |
377 | ||
378 | r_1v = cpu->state.regs[r_1]; | |
379 | rimmv = (rimm & 0x400) ? nsigned (10, rimm) : cpu->state.regs[rimm & 0x1f]; | |
380 | ||
381 | bit_pos = rimmv & 31; | |
382 | bit_len = 0xf & (rimmv >> 5); | |
383 | if (bit_len == 0) | |
384 | bit_len = 16; | |
385 | ||
386 | upper = (inst >> 27); | |
387 | ||
388 | insnpc = cpu->state.pc; | |
389 | cpu->state.pc += 4; | |
390 | switch (upper) | |
391 | { | |
392 | case FT32_PAT_TOC: | |
393 | case FT32_PAT_TOCI: | |
394 | { | |
395 | int take = (cr == 3) || ((1 & (cpu->state.regs[28 + cr] >> cb)) == cv); | |
396 | if (take) | |
397 | { | |
398 | cpu->state.cycles += 1; | |
399 | if (bt) | |
400 | ft32_push (sd, cpu->state.pc); /* this is a call. */ | |
401 | if (upper == FT32_PAT_TOC) | |
402 | cpu->state.pc = pa << 2; | |
403 | else | |
404 | cpu->state.pc = cpu->state.regs[r_2]; | |
405 | if (cpu->state.pc == 0x8) | |
406 | goto escape; | |
407 | } | |
408 | } | |
409 | break; | |
410 | ||
411 | case FT32_PAT_ALUOP: | |
412 | case FT32_PAT_CMPOP: | |
413 | { | |
414 | uint32_t result; | |
415 | switch (al) | |
416 | { | |
417 | case 0x0: result = r_1v + rimmv; break; | |
418 | case 0x1: result = ror (r_1v, rimmv); break; | |
419 | case 0x2: result = r_1v - rimmv; break; | |
420 | case 0x3: result = (r_1v << 10) | (1023 & rimmv); break; | |
421 | case 0x4: result = r_1v & rimmv; break; | |
422 | case 0x5: result = r_1v | rimmv; break; | |
423 | case 0x6: result = r_1v ^ rimmv; break; | |
424 | case 0x7: result = ~(r_1v ^ rimmv); break; | |
425 | case 0x8: result = r_1v << rimmv; break; | |
426 | case 0x9: result = r_1v >> rimmv; break; | |
427 | case 0xa: result = (int32_t)r_1v >> rimmv; break; | |
428 | case 0xb: result = bins (r_1v, rimmv >> 10, bit_len, bit_pos); break; | |
429 | case 0xc: result = nsigned (bit_len, r_1v >> bit_pos); break; | |
430 | case 0xd: result = nunsigned (bit_len, r_1v >> bit_pos); break; | |
431 | case 0xe: result = flip (r_1v, rimmv); break; | |
432 | default: | |
433 | sim_io_eprintf (sd, "Unhandled alu %#x\n", al); | |
434 | ILLEGAL (); | |
435 | } | |
436 | if (upper == FT32_PAT_ALUOP) | |
437 | cpu->state.regs[r_d] = result; | |
438 | else | |
439 | { | |
440 | uint32_t dwmask = 0; | |
441 | int dwsiz = 0; | |
442 | int zero; | |
443 | int sign; | |
444 | int ahi; | |
445 | int bhi; | |
446 | int overflow; | |
447 | int carry; | |
448 | int bit; | |
449 | uint64_t ra; | |
450 | uint64_t rb; | |
451 | int above; | |
452 | int greater; | |
453 | int greatereq; | |
454 | ||
455 | switch (dw) | |
456 | { | |
457 | case 0: dwsiz = 7; dwmask = 0xffU; break; | |
458 | case 1: dwsiz = 15; dwmask = 0xffffU; break; | |
459 | case 2: dwsiz = 31; dwmask = 0xffffffffU; break; | |
460 | } | |
461 | ||
462 | zero = (0 == (result & dwmask)); | |
463 | sign = 1 & (result >> dwsiz); | |
464 | ahi = 1 & (r_1v >> dwsiz); | |
465 | bhi = 1 & (rimmv >> dwsiz); | |
466 | overflow = (sign != ahi) & (ahi == !bhi); | |
467 | bit = (dwsiz + 1); | |
468 | ra = r_1v & dwmask; | |
469 | rb = rimmv & dwmask; | |
470 | switch (al) | |
471 | { | |
472 | case 0x0: carry = 1 & ((ra + rb) >> bit); break; | |
473 | case 0x2: carry = 1 & ((ra - rb) >> bit); break; | |
474 | default: carry = 0; break; | |
475 | } | |
476 | above = (!carry & !zero); | |
477 | greater = (sign == overflow) & !zero; | |
478 | greatereq = (sign == overflow); | |
479 | ||
480 | cpu->state.regs[r_d] = ( | |
481 | (above << 6) | | |
482 | (greater << 5) | | |
483 | (greatereq << 4) | | |
484 | (sign << 3) | | |
485 | (overflow << 2) | | |
486 | (carry << 1) | | |
487 | (zero << 0)); | |
488 | } | |
489 | } | |
490 | break; | |
491 | ||
492 | case FT32_PAT_LDK: | |
493 | cpu->state.regs[r_d] = k20; | |
494 | break; | |
495 | ||
496 | case FT32_PAT_LPM: | |
497 | cpu->state.regs[r_d] = ft32_read_item (sd, dw, pa << 2); | |
498 | cpu->state.cycles += 1; | |
499 | break; | |
500 | ||
501 | case FT32_PAT_LPMI: | |
502 | cpu->state.regs[r_d] = ft32_read_item (sd, dw, cpu->state.regs[r_1] + k8); | |
503 | cpu->state.cycles += 1; | |
504 | break; | |
505 | ||
506 | case FT32_PAT_STA: | |
507 | cpu_mem_write (sd, dw, aa, cpu->state.regs[r_d]); | |
508 | break; | |
509 | ||
510 | case FT32_PAT_STI: | |
511 | cpu_mem_write (sd, dw, cpu->state.regs[r_d] + k8, cpu->state.regs[r_1]); | |
512 | break; | |
513 | ||
514 | case FT32_PAT_LDA: | |
515 | cpu->state.regs[r_d] = cpu_mem_read (sd, dw, aa); | |
516 | cpu->state.cycles += 1; | |
517 | break; | |
518 | ||
519 | case FT32_PAT_LDI: | |
520 | cpu->state.regs[r_d] = cpu_mem_read (sd, dw, cpu->state.regs[r_1] + k8); | |
521 | cpu->state.cycles += 1; | |
522 | break; | |
523 | ||
524 | case FT32_PAT_EXA: | |
525 | { | |
526 | uint32_t tmp; | |
527 | tmp = cpu_mem_read (sd, dw, aa); | |
528 | cpu_mem_write (sd, dw, aa, cpu->state.regs[r_d]); | |
529 | cpu->state.regs[r_d] = tmp; | |
530 | cpu->state.cycles += 1; | |
531 | } | |
532 | break; | |
533 | ||
534 | case FT32_PAT_EXI: | |
535 | { | |
536 | uint32_t tmp; | |
537 | tmp = cpu_mem_read (sd, dw, cpu->state.regs[r_1] + k8); | |
538 | cpu_mem_write (sd, dw, cpu->state.regs[r_1] + k8, cpu->state.regs[r_d]); | |
539 | cpu->state.regs[r_d] = tmp; | |
540 | cpu->state.cycles += 1; | |
541 | } | |
542 | break; | |
543 | ||
544 | case FT32_PAT_PUSH: | |
545 | ft32_push (sd, r_1v); | |
546 | break; | |
547 | ||
548 | case FT32_PAT_LINK: | |
549 | ft32_push (sd, cpu->state.regs[r_d]); | |
550 | cpu->state.regs[r_d] = cpu->state.regs[FT32_HARD_SP]; | |
551 | cpu->state.regs[FT32_HARD_SP] -= k16; | |
552 | cpu->state.regs[FT32_HARD_SP] &= 0xffff; | |
553 | break; | |
554 | ||
555 | case FT32_PAT_UNLINK: | |
556 | cpu->state.regs[FT32_HARD_SP] = cpu->state.regs[r_d]; | |
557 | cpu->state.regs[FT32_HARD_SP] &= 0xffff; | |
558 | cpu->state.regs[r_d] = ft32_pop (sd); | |
559 | break; | |
560 | ||
561 | case FT32_PAT_POP: | |
562 | cpu->state.cycles += 1; | |
563 | cpu->state.regs[r_d] = ft32_pop (sd); | |
564 | break; | |
565 | ||
566 | case FT32_PAT_RETURN: | |
567 | cpu->state.pc = ft32_pop (sd); | |
568 | break; | |
569 | ||
570 | case FT32_PAT_FFUOP: | |
571 | switch (al) | |
572 | { | |
573 | case 0x0: | |
574 | cpu->state.regs[r_d] = r_1v / rimmv; | |
575 | break; | |
576 | case 0x1: | |
577 | cpu->state.regs[r_d] = r_1v % rimmv; | |
578 | break; | |
579 | case 0x2: | |
580 | cpu->state.regs[r_d] = ft32sdiv (r_1v, rimmv); | |
581 | break; | |
582 | case 0x3: | |
583 | cpu->state.regs[r_d] = ft32smod (r_1v, rimmv); | |
584 | break; | |
585 | ||
586 | case 0x4: | |
587 | { | |
588 | /* strcmp instruction. */ | |
589 | uint32_t a = r_1v; | |
590 | uint32_t b = rimmv; | |
591 | uint32_t i = 0; | |
592 | while ((GET_BYTE (a + i) != 0) && | |
593 | (GET_BYTE (a + i) == GET_BYTE (b + i))) | |
594 | i++; | |
595 | cpu->state.regs[r_d] = GET_BYTE (a + i) - GET_BYTE (b + i); | |
596 | } | |
597 | break; | |
598 | ||
599 | case 0x5: | |
600 | { | |
601 | /* memcpy instruction. */ | |
602 | uint32_t src = r_1v; | |
603 | uint32_t dst = cpu->state.regs[r_d]; | |
604 | uint32_t i; | |
395b0d8a | 605 | for (i = 0; i < (rimmv & 0x7fff); i++) |
f46e4eb7 JB |
606 | PUT_BYTE (dst + i, GET_BYTE (src + i)); |
607 | } | |
608 | break; | |
609 | case 0x6: | |
610 | { | |
611 | /* strlen instruction. */ | |
612 | uint32_t src = r_1v; | |
613 | uint32_t i; | |
614 | for (i = 0; GET_BYTE (src + i) != 0; i++) | |
615 | ; | |
616 | cpu->state.regs[r_d] = i; | |
617 | } | |
618 | break; | |
619 | case 0x7: | |
620 | { | |
621 | /* memset instruction. */ | |
622 | uint32_t dst = cpu->state.regs[r_d]; | |
623 | uint32_t i; | |
395b0d8a | 624 | for (i = 0; i < (rimmv & 0x7fff); i++) |
f46e4eb7 JB |
625 | PUT_BYTE (dst + i, r_1v); |
626 | } | |
627 | break; | |
628 | case 0x8: | |
629 | cpu->state.regs[r_d] = r_1v * rimmv; | |
630 | break; | |
631 | case 0x9: | |
632 | cpu->state.regs[r_d] = ((uint64_t)r_1v * (uint64_t)rimmv) >> 32; | |
633 | break; | |
634 | case 0xa: | |
635 | { | |
636 | /* stpcpy instruction. */ | |
637 | uint32_t src = r_1v; | |
638 | uint32_t dst = cpu->state.regs[r_d]; | |
639 | uint32_t i; | |
640 | for (i = 0; GET_BYTE (src + i) != 0; i++) | |
641 | PUT_BYTE (dst + i, GET_BYTE (src + i)); | |
642 | PUT_BYTE (dst + i, 0); | |
643 | cpu->state.regs[r_d] = dst + i; | |
644 | } | |
645 | break; | |
646 | case 0xe: | |
647 | { | |
648 | /* streamout instruction. */ | |
649 | uint32_t i; | |
650 | uint32_t src = cpu->state.regs[r_1]; | |
651 | for (i = 0; i < rimmv; i += (1 << dw)) | |
652 | { | |
653 | cpu_mem_write (sd, | |
654 | dw, | |
655 | cpu->state.regs[r_d], | |
656 | cpu_mem_read (sd, dw, src)); | |
657 | src += (1 << dw); | |
658 | } | |
659 | } | |
660 | break; | |
661 | default: | |
662 | sim_io_eprintf (sd, "Unhandled ffu %#x at %08x\n", al, insnpc); | |
663 | ILLEGAL (); | |
664 | } | |
665 | break; | |
666 | ||
667 | default: | |
668 | sim_io_eprintf (sd, "Unhandled pattern %d at %08x\n", upper, insnpc); | |
669 | ILLEGAL (); | |
670 | } | |
671 | cpu->state.num_i++; | |
672 | ||
673 | escape: | |
674 | ; | |
675 | } | |
676 | ||
677 | void | |
678 | sim_engine_run (SIM_DESC sd, | |
679 | int next_cpu_nr, /* ignore */ | |
680 | int nr_cpus, /* ignore */ | |
681 | int siggnal) /* ignore */ | |
682 | { | |
683 | sim_cpu *cpu; | |
684 | ||
685 | SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER); | |
686 | ||
687 | cpu = STATE_CPU (sd, 0); | |
688 | ||
689 | while (1) | |
690 | { | |
691 | step_once (sd); | |
692 | if (sim_events_tick (sd)) | |
693 | sim_events_process (sd); | |
694 | } | |
695 | } | |
696 | ||
f46e4eb7 JB |
697 | static uint32_t * |
698 | ft32_lookup_register (SIM_CPU *cpu, int nr) | |
699 | { | |
700 | /* Handle the register number translation here. | |
701 | * Sim registers are 0-31. | |
702 | * Other tools (gcc, gdb) use: | |
703 | * 0 - fp | |
704 | * 1 - sp | |
705 | * 2 - r0 | |
706 | * 31 - cc | |
707 | */ | |
708 | ||
709 | if ((nr < 0) || (nr > 32)) | |
710 | { | |
711 | sim_io_eprintf (CPU_STATE (cpu), "unknown register %i\n", nr); | |
712 | abort (); | |
713 | } | |
714 | ||
715 | switch (nr) | |
716 | { | |
717 | case FT32_FP_REGNUM: | |
718 | return &cpu->state.regs[FT32_HARD_FP]; | |
719 | case FT32_SP_REGNUM: | |
720 | return &cpu->state.regs[FT32_HARD_SP]; | |
721 | case FT32_CC_REGNUM: | |
722 | return &cpu->state.regs[FT32_HARD_CC]; | |
723 | case FT32_PC_REGNUM: | |
724 | return &cpu->state.pc; | |
725 | default: | |
726 | return &cpu->state.regs[nr - 2]; | |
727 | } | |
728 | } | |
729 | ||
730 | static int | |
731 | ft32_reg_store (SIM_CPU *cpu, | |
732 | int rn, | |
733 | unsigned char *memory, | |
734 | int length) | |
735 | { | |
736 | if (0 <= rn && rn <= 32) | |
737 | { | |
738 | if (length == 4) | |
739 | *ft32_lookup_register (cpu, rn) = ft32_extract_unsigned_integer (memory, 4); | |
740 | ||
741 | return 4; | |
742 | } | |
743 | else | |
744 | return 0; | |
745 | } | |
746 | ||
747 | static int | |
748 | ft32_reg_fetch (SIM_CPU *cpu, | |
749 | int rn, | |
750 | unsigned char *memory, | |
751 | int length) | |
752 | { | |
753 | if (0 <= rn && rn <= 32) | |
754 | { | |
755 | if (length == 4) | |
756 | ft32_store_unsigned_integer (memory, 4, *ft32_lookup_register (cpu, rn)); | |
757 | ||
758 | return 4; | |
759 | } | |
760 | else | |
761 | return 0; | |
762 | } | |
763 | ||
764 | static sim_cia | |
765 | ft32_pc_get (SIM_CPU *cpu) | |
766 | { | |
65f90968 | 767 | return cpu->state.pc; |
f46e4eb7 JB |
768 | } |
769 | ||
770 | static void | |
771 | ft32_pc_set (SIM_CPU *cpu, sim_cia newpc) | |
772 | { | |
773 | cpu->state.pc = newpc; | |
774 | } | |
775 | ||
776 | /* Cover function of sim_state_free to free the cpu buffers as well. */ | |
777 | ||
778 | static void | |
779 | free_state (SIM_DESC sd) | |
780 | { | |
781 | if (STATE_MODULES (sd) != NULL) | |
782 | sim_module_uninstall (sd); | |
783 | sim_cpu_free_all (sd); | |
784 | sim_state_free (sd); | |
785 | } | |
786 | ||
787 | SIM_DESC | |
788 | sim_open (SIM_OPEN_KIND kind, | |
789 | host_callback *cb, | |
790 | struct bfd *abfd, | |
791 | char **argv) | |
792 | { | |
793 | char c; | |
794 | size_t i; | |
795 | SIM_DESC sd = sim_state_alloc (kind, cb); | |
796 | ||
797 | /* The cpu data is kept in a separately allocated chunk of memory. */ | |
798 | if (sim_cpu_alloc_all (sd, 1, /*cgen_cpu_max_extra_bytes ()*/0) != SIM_RC_OK) | |
799 | { | |
800 | free_state (sd); | |
801 | return 0; | |
802 | } | |
803 | ||
804 | if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK) | |
805 | { | |
806 | free_state (sd); | |
807 | return 0; | |
808 | } | |
809 | ||
810 | /* getopt will print the error message so we just have to exit if this fails. | |
811 | FIXME: Hmmm... in the case of gdb we need getopt to call | |
812 | print_filtered. */ | |
813 | if (sim_parse_args (sd, argv) != SIM_RC_OK) | |
814 | { | |
815 | free_state (sd); | |
816 | return 0; | |
817 | } | |
818 | ||
819 | /* Allocate external memory if none specified by user. | |
820 | Use address 4 here in case the user wanted address 0 unmapped. */ | |
821 | if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0) | |
822 | { | |
823 | sim_do_command (sd, "memory region 0x00000000,0x40000"); | |
824 | sim_do_command (sd, "memory region 0x800000,0x10000"); | |
825 | } | |
826 | ||
827 | /* Check for/establish the reference program image. */ | |
828 | if (sim_analyze_program (sd, | |
829 | (STATE_PROG_ARGV (sd) != NULL | |
830 | ? *STATE_PROG_ARGV (sd) | |
831 | : NULL), abfd) != SIM_RC_OK) | |
832 | { | |
833 | free_state (sd); | |
834 | return 0; | |
835 | } | |
836 | ||
837 | /* Configure/verify the target byte order and other runtime | |
838 | configuration options. */ | |
839 | if (sim_config (sd) != SIM_RC_OK) | |
840 | { | |
841 | free_state (sd); | |
842 | return 0; | |
843 | } | |
844 | ||
845 | if (sim_post_argv_init (sd) != SIM_RC_OK) | |
846 | { | |
847 | free_state (sd); | |
848 | return 0; | |
849 | } | |
850 | ||
851 | /* CPU specific initialization. */ | |
852 | for (i = 0; i < MAX_NR_PROCESSORS; ++i) | |
853 | { | |
854 | SIM_CPU *cpu = STATE_CPU (sd, i); | |
855 | ||
856 | CPU_REG_FETCH (cpu) = ft32_reg_fetch; | |
857 | CPU_REG_STORE (cpu) = ft32_reg_store; | |
858 | CPU_PC_FETCH (cpu) = ft32_pc_get; | |
859 | CPU_PC_STORE (cpu) = ft32_pc_set; | |
860 | } | |
861 | ||
862 | return sd; | |
863 | } | |
864 | ||
f46e4eb7 JB |
865 | SIM_RC |
866 | sim_create_inferior (SIM_DESC sd, | |
867 | struct bfd *abfd, | |
868 | char **argv, | |
869 | char **env) | |
870 | { | |
871 | uint32_t addr; | |
872 | sim_cpu *cpu = STATE_CPU (sd, 0); | |
873 | ||
874 | /* Set the PC. */ | |
875 | if (abfd != NULL) | |
876 | addr = bfd_get_start_address (abfd); | |
877 | else | |
878 | addr = 0; | |
879 | ||
0e967299 MF |
880 | /* Standalone mode (i.e. `run`) will take care of the argv for us in |
881 | sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim' | |
882 | with `gdb`), we need to handle it because the user can change the | |
883 | argv on the fly via gdb's 'run'. */ | |
884 | if (STATE_PROG_ARGV (sd) != argv) | |
f46e4eb7 JB |
885 | { |
886 | freeargv (STATE_PROG_ARGV (sd)); | |
887 | STATE_PROG_ARGV (sd) = dupargv (argv); | |
888 | } | |
889 | cpu->state.regs[FT32_HARD_SP] = addr; | |
890 | cpu->state.num_i = 0; | |
891 | cpu->state.cycles = 0; | |
892 | cpu->state.next_tick_cycle = 100000; | |
893 | ||
894 | return SIM_RC_OK; | |
895 | } |