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kvm: qemu: ftruncate() is not supported by hugetlbfs on older hosts
[kvm-userspace.git] / qemu / darwin-user / commpage.c
blob78a14130a13dfd0ce749b74ef4d6acfdca600389
1 /*
2 * Commpage syscalls
3 *
4 * Copyright (c) 2006 Pierre d'Herbemont
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20 #include <fcntl.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <errno.h>
24
25 #include <mach/message.h>
26 #include <mach/mach.h>
27 #include <mach/mach_time.h>
28 #include <sys/time.h>
29 #include <sys/mman.h>
30 #include <libkern/OSAtomic.h>
31
32 #include "qemu.h"
33
34 //#define DEBUG_COMMPAGE
35
36 #ifdef DEBUG_COMMPAGE
37 # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); printf(__VA_ARGS__); } while(0)
38 #else
39 # define DPRINTF(...) do { if(loglevel) fprintf(logfile, __VA_ARGS__); } while(0)
40 #endif
41
42 /********************************************************************
43 * Commpage definitions
44 */
45 #ifdef TARGET_I386
46 /* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */
47 # define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */
48 # define COMMPAGE_SIZE (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */
49 #elif defined(TARGET_PPC)
50 /* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */
51 # define COMMPAGE_START (-8*4096)
52 # define COMMPAGE_SIZE (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */
53 #endif
54
55 void do_compare_and_swap32(void *cpu_env, int num);
56 void do_compare_and_swap64(void *cpu_env, int num);
57 void do_add_atomic_word32(void *cpu_env, int num);
58 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1);
59 void do_nanotime(void *cpu_env, int num);
60
61 void unimpl_commpage(void *cpu_env, int num);
62
63 typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3,
64 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
65 uint32_t arg8);
66 typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1,
67 uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5,
68 uint32_t arg6, uint32_t arg7, uint32_t arg8);
69
70 #define HAS_PTR 0x10
71 #define NO_PTR 0x20
72 #define CALL_DIRECT 0x1
73 #define CALL_INDIRECT 0x2
74
75 #define COMMPAGE_ENTRY(name, nargs, offset, func, options) \
76 { #name, offset, nargs, options, (commpage_8args_function_t)func }
77
78 struct commpage_entry {
79 char * name;
80 int offset;
81 int nargs;
82 char options;
83 commpage_8args_function_t function;
84 };
85
86 static inline int commpage_code_num(struct commpage_entry *entry)
87 {
88 if((entry->options & HAS_PTR))
89 return entry->offset + 4;
90 else
91 return entry->offset;
92 }
93
94 static inline int commpage_is_indirect(struct commpage_entry *entry)
95 {
96 return !(entry->options & CALL_DIRECT);
97 }
98
99 /********************************************************************
100 * Commpage entry
101 */
102 static struct commpage_entry commpage_entries[] =
103 {
104 COMMPAGE_ENTRY(compare_and_swap32, 0, 0x080, do_compare_and_swap32, CALL_INDIRECT | HAS_PTR),
105 COMMPAGE_ENTRY(compare_and_swap64, 0, 0x0c0, do_compare_and_swap64, CALL_INDIRECT | HAS_PTR),
106 COMMPAGE_ENTRY(enqueue, 0, 0x100, unimpl_commpage, CALL_INDIRECT),
107 COMMPAGE_ENTRY(dequeue, 0, 0x140, unimpl_commpage, CALL_INDIRECT),
108 COMMPAGE_ENTRY(memory_barrier, 0, 0x180, unimpl_commpage, CALL_INDIRECT),
109 COMMPAGE_ENTRY(add_atomic_word32, 0, 0x1a0, do_add_atomic_word32, CALL_INDIRECT | HAS_PTR),
110 COMMPAGE_ENTRY(add_atomic_word64, 0, 0x1c0, unimpl_commpage, CALL_INDIRECT | HAS_PTR),
111
112 COMMPAGE_ENTRY(mach_absolute_time, 0, 0x200, unimpl_commpage, CALL_INDIRECT),
113 COMMPAGE_ENTRY(spinlock_try, 1, 0x220, unimpl_commpage, CALL_INDIRECT),
114 COMMPAGE_ENTRY(spinlock_lock, 1, 0x260, OSSpinLockLock, CALL_DIRECT),
115 COMMPAGE_ENTRY(spinlock_unlock, 1, 0x2a0, OSSpinLockUnlock, CALL_DIRECT),
116 COMMPAGE_ENTRY(pthread_getspecific, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT),
117 COMMPAGE_ENTRY(gettimeofday, 1, 0x2e0, do_cgettimeofday, CALL_INDIRECT),
118 COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x4e0, unimpl_commpage, CALL_INDIRECT),
119 COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520, unimpl_commpage, CALL_INDIRECT),
120 COMMPAGE_ENTRY(pthread_self, 0, 0x580, unimpl_commpage, CALL_INDIRECT),
121
122 COMMPAGE_ENTRY(relinquish, 0, 0x5c0, unimpl_commpage, CALL_INDIRECT),
123
124 #ifdef TARGET_I386
125 COMMPAGE_ENTRY(bts, 0, 0x5e0, unimpl_commpage, CALL_INDIRECT),
126 COMMPAGE_ENTRY(btc, 0, 0x5f0, unimpl_commpage, CALL_INDIRECT),
127 #endif
128
129 COMMPAGE_ENTRY(bzero, 2, 0x600, bzero, CALL_DIRECT),
130 COMMPAGE_ENTRY(bcopy, 3, 0x780, bcopy, CALL_DIRECT),
131 COMMPAGE_ENTRY(memcpy, 3, 0x7a0, memcpy, CALL_DIRECT),
132
133 #ifdef TARGET_I386
134 COMMPAGE_ENTRY(old_nanotime, 0, 0xf80, do_nanotime, CALL_INDIRECT),
135 COMMPAGE_ENTRY(memset_pattern, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
136 COMMPAGE_ENTRY(long_copy, 0, 0x1200, unimpl_commpage, CALL_INDIRECT),
137
138 COMMPAGE_ENTRY(sysintegrity, 0, 0x1600, unimpl_commpage, CALL_INDIRECT),
139
140 COMMPAGE_ENTRY(nanotime, 0, 0x1700, do_nanotime, CALL_INDIRECT),
141 #elif TARGET_PPC
142 COMMPAGE_ENTRY(compare_and_swap32b, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
143 COMMPAGE_ENTRY(compare_and_swap64b, 0, 0xfc0, unimpl_commpage, CALL_INDIRECT),
144 COMMPAGE_ENTRY(memset_pattern, 0, 0x1000, unimpl_commpage, CALL_INDIRECT),
145 COMMPAGE_ENTRY(bigcopy, 0, 0x1140, unimpl_commpage, CALL_INDIRECT),
146 #endif
147 };
148
149
150 /********************************************************************
151 * Commpage backdoor
152 */
153 static inline void print_commpage_entry(struct commpage_entry entry)
154 {
155 printf("@0x%x %s\n", entry.offset, entry.name);
156 }
157
158 static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry)
159 {
160 #ifdef TARGET_I386
161 char * commpage = (char*)(COMMPAGE_START+entry.offset);
162 int c = 0;
163 if(entry.options & HAS_PTR)
164 {
165 commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff;
166 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff;
167 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff;
168 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff;
169 }
170 commpage[c++] = 0xcd;
171 commpage[c++] = 0x79; /* int 0x79 */
172 commpage[c++] = 0xc3; /* ret */
173 #else
174 qerror("can't install the commpage on this arch\n");
175 #endif
176 }
177
178 /********************************************************************
179 * Commpage initialization
180 */
181 void commpage_init(void)
182 {
183 #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(__powerpc__) ^ defined(TARGET_PPC))
184 int i;
185 void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE,
186 PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
187 if((int)commpage != COMMPAGE_START)
188 qerror("can't allocate the commpage\n");
189
190 bzero(commpage, COMMPAGE_SIZE);
191
192 /* XXX: commpage data not handled */
193
194 for(i = 0; i < sizeof(commpage_entries)/sizeof(commpage_entries[0]); i++)
195 install_commpage_backdoor_for_entry(commpage_entries[i]);
196 #else
197 /* simply map our pages so they can be executed
198 XXX: we don't really want to do that since in the ppc on ppc situation we may
199 not able to run commpages host optimized instructions (like G5's on a G5),
200 hence this is sometimes a broken fix. */
201 page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID);
202 #endif
203 }
204
205 /********************************************************************
206 * Commpage implementation
207 */
208 void do_compare_and_swap32(void *cpu_env, int num)
209 {
210 #ifdef TARGET_I386
211 uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX];
212 uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX];
213 DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value);
214
215 if(value && old == tswap32(*value))
216 {
217 uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX];
218 *value = tswap32(new);
219 /* set zf flag */
220 ((CPUX86State*)cpu_env)->eflags |= 0x40;
221 }
222 else
223 {
224 ((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value);
225 /* unset zf flag */
226 ((CPUX86State*)cpu_env)->eflags &= ~0x40;
227 }
228 #else
229 qerror("do_compare_and_swap32 unimplemented");
230 #endif
231 }
232
233 void do_compare_and_swap64(void *cpu_env, int num)
234 {
235 #ifdef TARGET_I386
236 /* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */
237 uint64_t old, new, swapped_val;
238 uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI];
239 old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX];
240
241 DPRINTF("commpage: compare_and_swap64(%llx,new,%p)\n", old, value);
242 swapped_val = tswap64(*value);
243
244 if(old == swapped_val)
245 {
246 new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX];
247 *value = tswap64(new);
248 /* set zf flag */
249 ((CPUX86State*)cpu_env)->eflags |= 0x40;
250 }
251 else
252 {
253 ((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val);
254 ((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32);
255 /* unset zf flag */
256 ((CPUX86State*)cpu_env)->eflags &= ~0x40;
257 }
258 #else
259 qerror("do_compare_and_swap64 unimplemented");
260 #endif
261 }
262
263 void do_add_atomic_word32(void *cpu_env, int num)
264 {
265 #ifdef TARGET_I386
266 uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX];
267 uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX];
268 uint32_t swapped_value = tswap32(*value);
269
270 DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value);
271
272 /* old value in EAX */
273 ((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value;
274 *value = tswap32(swapped_value + amt);
275 #else
276 qerror("do_add_atomic_word32 unimplemented");
277 #endif
278 }
279
280 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1)
281 {
282 #ifdef TARGET_I386
283 extern int __commpage_gettimeofday(struct timeval *);
284 DPRINTF("commpage: gettimeofday(0x%x)\n", arg1);
285 struct timeval *time = (struct timeval *)arg1;
286 int ret = __commpage_gettimeofday(time);
287 tswap32s((uint32_t*)&time->tv_sec);
288 tswap32s((uint32_t*)&time->tv_usec);
289 ((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */
290 #else
291 qerror("do_gettimeofday unimplemented");
292 #endif
293 }
294
295 void do_nanotime(void *cpu_env, int num)
296 {
297 #ifdef TARGET_I386
298 uint64_t t = mach_absolute_time();
299 ((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff);
300 ((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff);
301 #else
302 qerror("do_nanotime unimplemented");
303 #endif
304 }
305
306 void unimpl_commpage(void *cpu_env, int num)
307 {
308 qerror("qemu: commpage function 0x%x not implemented\n", num);
309 }
310
311 /********************************************************************
312 * do_commpage - called by the main cpu loop
313 */
314 void
315 do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
316 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
317 uint32_t arg8)
318 {
319 int i, found = 0;
320
321 arg1 = tswap32(arg1);
322 arg2 = tswap32(arg2);
323 arg3 = tswap32(arg3);
324 arg4 = tswap32(arg4);
325 arg5 = tswap32(arg5);
326 arg6 = tswap32(arg6);
327 arg7 = tswap32(arg7);
328 arg8 = tswap32(arg8);
329
330 num = num-COMMPAGE_START-2;
331
332 for(i = 0; i < sizeof(commpage_entries)/sizeof(commpage_entries[0]); i++) {
333 if( num == commpage_code_num(&commpage_entries[i]) )
334 {
335 DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]");
336 found = 1;
337 if(commpage_is_indirect(&commpage_entries[i]))
338 {
339 commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function;
340 function(cpu_env, num, arg1, arg2, arg3,
341 arg4, arg5, arg6, arg7, arg8);
342 }
343 else
344 {
345 commpage_entries[i].function(arg1, arg2, arg3,
346 arg4, arg5, arg6, arg7, arg8);
347 }
348 break;
349 }
350 }
351
352 if(!found)
353 {
354 gemu_log("qemu: commpage function 0x%x not defined\n", num);
355 gdb_handlesig (cpu_env, SIGTRAP);
356 exit(-1);
357 }
358 }
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