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kvm: qemu: ftruncate() is not supported by hugetlbfs on older hosts
[kvm-userspace.git] / qemu / tcg / tcg-dyngen.c
blob1cc084e6ef55466709b8cfde95c350fd74ce1929
1 /*
2 * Tiny Code Generator for QEMU
3 *
4 * Copyright (c) 2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include <assert.h>
25 #include <stdarg.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <string.h>
29 #include <inttypes.h>
30
31 #include "config.h"
32 #include "osdep.h"
33
34 #include "tcg.h"
35
36 int __op_param1, __op_param2, __op_param3;
37 #if defined(__sparc__) || defined(__arm__)
38 void __op_gen_label1(){}
39 void __op_gen_label2(){}
40 void __op_gen_label3(){}
41 #else
42 int __op_gen_label1, __op_gen_label2, __op_gen_label3;
43 #endif
44 int __op_jmp0, __op_jmp1, __op_jmp2, __op_jmp3;
45
46 #if 0
47 #if defined(__s390__)
48 static inline void flush_icache_range(unsigned long start, unsigned long stop)
49 {
50 }
51 #elif defined(__ia64__)
52 static inline void flush_icache_range(unsigned long start, unsigned long stop)
53 {
54 while (start < stop) {
55 asm volatile ("fc %0" :: "r"(start));
56 start += 32;
57 }
58 asm volatile (";;sync.i;;srlz.i;;");
59 }
60 #elif defined(__powerpc__)
61
62 #define MIN_CACHE_LINE_SIZE 8 /* conservative value */
63
64 static inline void flush_icache_range(unsigned long start, unsigned long stop)
65 {
66 unsigned long p;
67
68 start &= ~(MIN_CACHE_LINE_SIZE - 1);
69 stop = (stop + MIN_CACHE_LINE_SIZE - 1) & ~(MIN_CACHE_LINE_SIZE - 1);
70
71 for (p = start; p < stop; p += MIN_CACHE_LINE_SIZE) {
72 asm volatile ("dcbst 0,%0" : : "r"(p) : "memory");
73 }
74 asm volatile ("sync" : : : "memory");
75 for (p = start; p < stop; p += MIN_CACHE_LINE_SIZE) {
76 asm volatile ("icbi 0,%0" : : "r"(p) : "memory");
77 }
78 asm volatile ("sync" : : : "memory");
79 asm volatile ("isync" : : : "memory");
80 }
81 #elif defined(__alpha__)
82 static inline void flush_icache_range(unsigned long start, unsigned long stop)
83 {
84 asm ("imb");
85 }
86 #elif defined(__sparc__)
87 static inline void flush_icache_range(unsigned long start, unsigned long stop)
88 {
89 unsigned long p;
90
91 p = start & ~(8UL - 1UL);
92 stop = (stop + (8UL - 1UL)) & ~(8UL - 1UL);
93
94 for (; p < stop; p += 8)
95 __asm__ __volatile__("flush\t%0" : : "r" (p));
96 }
97 #elif defined(__arm__)
98 static inline void flush_icache_range(unsigned long start, unsigned long stop)
99 {
100 register unsigned long _beg __asm ("a1") = start;
101 register unsigned long _end __asm ("a2") = stop;
102 register unsigned long _flg __asm ("a3") = 0;
103 __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));
104 }
105 #elif defined(__mc68000)
106
107 # include <asm/cachectl.h>
108 static inline void flush_icache_range(unsigned long start, unsigned long stop)
109 {
110 cacheflush(start,FLUSH_SCOPE_LINE,FLUSH_CACHE_BOTH,stop-start+16);
111 }
112 #elif defined(__mips__)
113
114 #include <sys/cachectl.h>
115 static inline void flush_icache_range(unsigned long start, unsigned long stop)
116 {
117 _flush_cache ((void *)start, stop - start, BCACHE);
118 }
119 #else
120 #error unsupported CPU
121 #endif
122
123 #ifdef __alpha__
124
125 register int gp asm("$29");
126
127 static inline void immediate_ldah(void *p, int val) {
128 uint32_t *dest = p;
129 long high = ((val >> 16) + ((val >> 15) & 1)) & 0xffff;
130
131 *dest &= ~0xffff;
132 *dest |= high;
133 *dest |= 31 << 16;
134 }
135 static inline void immediate_lda(void *dest, int val) {
136 *(uint16_t *) dest = val;
137 }
138 void fix_bsr(void *p, int offset) {
139 uint32_t *dest = p;
140 *dest &= ~((1 << 21) - 1);
141 *dest |= (offset >> 2) & ((1 << 21) - 1);
142 }
143
144 #endif /* __alpha__ */
145
146 #ifdef __arm__
147
148 #define ARM_LDR_TABLE_SIZE 1024
149
150 typedef struct LDREntry {
151 uint8_t *ptr;
152 uint32_t *data_ptr;
153 unsigned type:2;
154 } LDREntry;
155
156 static LDREntry arm_ldr_table[1024];
157 static uint32_t arm_data_table[ARM_LDR_TABLE_SIZE];
158
159 extern char exec_loop;
160
161 static inline void arm_reloc_pc24(uint32_t *ptr, uint32_t insn, int val)
162 {
163 *ptr = (insn & ~0xffffff) | ((insn + ((val - (int)ptr) >> 2)) & 0xffffff);
164 }
165
166 static uint8_t *arm_flush_ldr(uint8_t *gen_code_ptr,
167 LDREntry *ldr_start, LDREntry *ldr_end,
168 uint32_t *data_start, uint32_t *data_end,
169 int gen_jmp)
170 {
171 LDREntry *le;
172 uint32_t *ptr;
173 int offset, data_size, target;
174 uint8_t *data_ptr;
175 uint32_t insn;
176 uint32_t mask;
177
178 data_size = (data_end - data_start) << 2;
179
180 if (gen_jmp) {
181 /* generate branch to skip the data */
182 if (data_size == 0)
183 return gen_code_ptr;
184 target = (long)gen_code_ptr + data_size + 4;
185 arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, target);
186 gen_code_ptr += 4;
187 }
188
189 /* copy the data */
190 data_ptr = gen_code_ptr;
191 memcpy(gen_code_ptr, data_start, data_size);
192 gen_code_ptr += data_size;
193
194 /* patch the ldr to point to the data */
195 for(le = ldr_start; le < ldr_end; le++) {
196 ptr = (uint32_t *)le->ptr;
197 offset = ((unsigned long)(le->data_ptr) - (unsigned long)data_start) +
198 (unsigned long)data_ptr -
199 (unsigned long)ptr - 8;
200 if (offset < 0) {
201 fprintf(stderr, "Negative constant pool offset\n");
202 tcg_abort();
203 }
204 switch (le->type) {
205 case 0: /* ldr */
206 mask = ~0x00800fff;
207 if (offset >= 4096) {
208 fprintf(stderr, "Bad ldr offset\n");
209 tcg_abort();
210 }
211 break;
212 case 1: /* ldc */
213 mask = ~0x008000ff;
214 if (offset >= 1024 ) {
215 fprintf(stderr, "Bad ldc offset\n");
216 tcg_abort();
217 }
218 break;
219 case 2: /* add */
220 mask = ~0xfff;
221 if (offset >= 1024 ) {
222 fprintf(stderr, "Bad add offset\n");
223 tcg_abort();
224 }
225 break;
226 default:
227 fprintf(stderr, "Bad pc relative fixup\n");
228 tcg_abort();
229 }
230 insn = *ptr & mask;
231 switch (le->type) {
232 case 0: /* ldr */
233 insn |= offset | 0x00800000;
234 break;
235 case 1: /* ldc */
236 insn |= (offset >> 2) | 0x00800000;
237 break;
238 case 2: /* add */
239 insn |= (offset >> 2) | 0xf00;
240 break;
241 }
242 *ptr = insn;
243 }
244 return gen_code_ptr;
245 }
246
247 #endif /* __arm__ */
248
249 #ifdef __ia64
250
251 /* Patch instruction with "val" where "mask" has 1 bits. */
252 static inline void ia64_patch (uint64_t insn_addr, uint64_t mask, uint64_t val)
253 {
254 uint64_t m0, m1, v0, v1, b0, b1, *b = (uint64_t *) (insn_addr & -16);
255 # define insn_mask ((1UL << 41) - 1)
256 unsigned long shift;
257
258 b0 = b[0]; b1 = b[1];
259 shift = 5 + 41 * (insn_addr % 16); /* 5 template, 3 x 41-bit insns */
260 if (shift >= 64) {
261 m1 = mask << (shift - 64);
262 v1 = val << (shift - 64);
263 } else {
264 m0 = mask << shift; m1 = mask >> (64 - shift);
265 v0 = val << shift; v1 = val >> (64 - shift);
266 b[0] = (b0 & ~m0) | (v0 & m0);
267 }
268 b[1] = (b1 & ~m1) | (v1 & m1);
269 }
270
271 static inline void ia64_patch_imm60 (uint64_t insn_addr, uint64_t val)
272 {
273 ia64_patch(insn_addr,
274 0x011ffffe000UL,
275 ( ((val & 0x0800000000000000UL) >> 23) /* bit 59 -> 36 */
276 | ((val & 0x00000000000fffffUL) << 13) /* bit 0 -> 13 */));
277 ia64_patch(insn_addr - 1, 0x1fffffffffcUL, val >> 18);
278 }
279
280 static inline void ia64_imm64 (void *insn, uint64_t val)
281 {
282 /* Ignore the slot number of the relocation; GCC and Intel
283 toolchains differed for some time on whether IMM64 relocs are
284 against slot 1 (Intel) or slot 2 (GCC). */
285 uint64_t insn_addr = (uint64_t) insn & ~3UL;
286
287 ia64_patch(insn_addr + 2,
288 0x01fffefe000UL,
289 ( ((val & 0x8000000000000000UL) >> 27) /* bit 63 -> 36 */
290 | ((val & 0x0000000000200000UL) << 0) /* bit 21 -> 21 */
291 | ((val & 0x00000000001f0000UL) << 6) /* bit 16 -> 22 */
292 | ((val & 0x000000000000ff80UL) << 20) /* bit 7 -> 27 */
293 | ((val & 0x000000000000007fUL) << 13) /* bit 0 -> 13 */)
294 );
295 ia64_patch(insn_addr + 1, 0x1ffffffffffUL, val >> 22);
296 }
297
298 static inline void ia64_imm60b (void *insn, uint64_t val)
299 {
300 /* Ignore the slot number of the relocation; GCC and Intel
301 toolchains differed for some time on whether IMM64 relocs are
302 against slot 1 (Intel) or slot 2 (GCC). */
303 uint64_t insn_addr = (uint64_t) insn & ~3UL;
304
305 if (val + ((uint64_t) 1 << 59) >= (1UL << 60))
306 fprintf(stderr, "%s: value %ld out of IMM60 range\n",
307 __FUNCTION__, (int64_t) val);
308 ia64_patch_imm60(insn_addr + 2, val);
309 }
310
311 static inline void ia64_imm22 (void *insn, uint64_t val)
312 {
313 if (val + (1 << 21) >= (1 << 22))
314 fprintf(stderr, "%s: value %li out of IMM22 range\n",
315 __FUNCTION__, (int64_t)val);
316 ia64_patch((uint64_t) insn, 0x01fffcfe000UL,
317 ( ((val & 0x200000UL) << 15) /* bit 21 -> 36 */
318 | ((val & 0x1f0000UL) << 6) /* bit 16 -> 22 */
319 | ((val & 0x00ff80UL) << 20) /* bit 7 -> 27 */
320 | ((val & 0x00007fUL) << 13) /* bit 0 -> 13 */));
321 }
322
323 /* Like ia64_imm22(), but also clear bits 20-21. For addl, this has
324 the effect of turning "addl rX=imm22,rY" into "addl
325 rX=imm22,r0". */
326 static inline void ia64_imm22_r0 (void *insn, uint64_t val)
327 {
328 if (val + (1 << 21) >= (1 << 22))
329 fprintf(stderr, "%s: value %li out of IMM22 range\n",
330 __FUNCTION__, (int64_t)val);
331 ia64_patch((uint64_t) insn, 0x01fffcfe000UL | (0x3UL << 20),
332 ( ((val & 0x200000UL) << 15) /* bit 21 -> 36 */
333 | ((val & 0x1f0000UL) << 6) /* bit 16 -> 22 */
334 | ((val & 0x00ff80UL) << 20) /* bit 7 -> 27 */
335 | ((val & 0x00007fUL) << 13) /* bit 0 -> 13 */));
336 }
337
338 static inline void ia64_imm21b (void *insn, uint64_t val)
339 {
340 if (val + (1 << 20) >= (1 << 21))
341 fprintf(stderr, "%s: value %li out of IMM21b range\n",
342 __FUNCTION__, (int64_t)val);
343 ia64_patch((uint64_t) insn, 0x11ffffe000UL,
344 ( ((val & 0x100000UL) << 16) /* bit 20 -> 36 */
345 | ((val & 0x0fffffUL) << 13) /* bit 0 -> 13 */));
346 }
347
348 static inline void ia64_nop_b (void *insn)
349 {
350 ia64_patch((uint64_t) insn, (1UL << 41) - 1, 2UL << 37);
351 }
352
353 static inline void ia64_ldxmov(void *insn, uint64_t val)
354 {
355 if (val + (1 << 21) < (1 << 22))
356 ia64_patch((uint64_t) insn, 0x1fff80fe000UL, 8UL << 37);
357 }
358
359 static inline int ia64_patch_ltoff(void *insn, uint64_t val,
360 int relaxable)
361 {
362 if (relaxable && (val + (1 << 21) < (1 << 22))) {
363 ia64_imm22_r0(insn, val);
364 return 0;
365 }
366 return 1;
367 }
368
369 struct ia64_fixup {
370 struct ia64_fixup *next;
371 void *addr; /* address that needs to be patched */
372 long value;
373 };
374
375 #define IA64_PLT(insn, plt_index) \
376 do { \
377 struct ia64_fixup *fixup = alloca(sizeof(*fixup)); \
378 fixup->next = plt_fixes; \
379 plt_fixes = fixup; \
380 fixup->addr = (insn); \
381 fixup->value = (plt_index); \
382 plt_offset[(plt_index)] = 1; \
383 } while (0)
384
385 #define IA64_LTOFF(insn, val, relaxable) \
386 do { \
387 if (ia64_patch_ltoff(insn, val, relaxable)) { \
388 struct ia64_fixup *fixup = alloca(sizeof(*fixup)); \
389 fixup->next = ltoff_fixes; \
390 ltoff_fixes = fixup; \
391 fixup->addr = (insn); \
392 fixup->value = (val); \
393 } \
394 } while (0)
395
396 static inline void ia64_apply_fixes (uint8_t **gen_code_pp,
397 struct ia64_fixup *ltoff_fixes,
398 uint64_t gp,
399 struct ia64_fixup *plt_fixes,
400 int num_plts,
401 unsigned long *plt_target,
402 unsigned int *plt_offset)
403 {
404 static const uint8_t plt_bundle[] = {
405 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, /* nop 0; movl r1=GP */
406 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x60,
407
408 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, /* nop 0; brl IP */
409 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0
410 };
411 uint8_t *gen_code_ptr = *gen_code_pp, *plt_start, *got_start;
412 uint64_t *vp;
413 struct ia64_fixup *fixup;
414 unsigned int offset = 0;
415 struct fdesc {
416 long ip;
417 long gp;
418 } *fdesc;
419 int i;
420
421 if (plt_fixes) {
422 plt_start = gen_code_ptr;
423
424 for (i = 0; i < num_plts; ++i) {
425 if (plt_offset[i]) {
426 plt_offset[i] = offset;
427 offset += sizeof(plt_bundle);
428
429 fdesc = (struct fdesc *) plt_target[i];
430 memcpy(gen_code_ptr, plt_bundle, sizeof(plt_bundle));
431 ia64_imm64 (gen_code_ptr + 0x02, fdesc->gp);
432 ia64_imm60b(gen_code_ptr + 0x12,
433 (fdesc->ip - (long) (gen_code_ptr + 0x10)) >> 4);
434 gen_code_ptr += sizeof(plt_bundle);
435 }
436 }
437
438 for (fixup = plt_fixes; fixup; fixup = fixup->next)
439 ia64_imm21b(fixup->addr,
440 ((long) plt_start + plt_offset[fixup->value]
441 - ((long) fixup->addr & ~0xf)) >> 4);
442 }
443
444 got_start = gen_code_ptr;
445
446 /* First, create the GOT: */
447 for (fixup = ltoff_fixes; fixup; fixup = fixup->next) {
448 /* first check if we already have this value in the GOT: */
449 for (vp = (uint64_t *) got_start; vp < (uint64_t *) gen_code_ptr; ++vp)
450 if (*vp == fixup->value)
451 break;
452 if (vp == (uint64_t *) gen_code_ptr) {
453 /* Nope, we need to put the value in the GOT: */
454 *vp = fixup->value;
455 gen_code_ptr += 8;
456 }
457 ia64_imm22(fixup->addr, (long) vp - gp);
458 }
459 /* Keep code ptr aligned. */
460 if ((long) gen_code_ptr & 15)
461 gen_code_ptr += 8;
462 *gen_code_pp = gen_code_ptr;
463 }
464 #endif
465 #endif
466
467 const TCGArg *dyngen_op(TCGContext *s, int opc, const TCGArg *opparam_ptr)
468 {
469 uint8_t *gen_code_ptr;
470
471 gen_code_ptr = s->code_ptr;
472 switch(opc) {
473
474 /* op.h is dynamically generated by dyngen.c from op.c */
475 #include "op.h"
476
477 default:
478 tcg_abort();
479 }
480 s->code_ptr = gen_code_ptr;
481 return opparam_ptr;
482 }
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