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kvm: qemu: propagate errors on failed migration.
[kvm-userspace.git] / qemu / darwin-user / commpage.c
blob8961bef443d324358061d6ad8a57a2dbeb014ecf
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., 51 Franklin Street - Fifth Floor, Boston,
19 * MA 02110-1301, USA.
20 */
21 #include <fcntl.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <errno.h>
25
26 #include <mach/message.h>
27 #include <mach/mach.h>
28 #include <mach/mach_time.h>
29 #include <sys/time.h>
30 #include <sys/mman.h>
31 #include <libkern/OSAtomic.h>
32
33 #include "qemu.h"
34
35 //#define DEBUG_COMMPAGE
36
37 #ifdef DEBUG_COMMPAGE
38 # define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
39 #else
40 # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
41 #endif
42
43 /********************************************************************
44 * Commpage definitions
45 */
46 #ifdef TARGET_I386
47 /* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */
48 # define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */
49 # define COMMPAGE_SIZE (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */
50 #elif defined(TARGET_PPC)
51 /* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */
52 # define COMMPAGE_START (-8*4096)
53 # define COMMPAGE_SIZE (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */
54 #endif
55
56 void do_compare_and_swap32(void *cpu_env, int num);
57 void do_compare_and_swap64(void *cpu_env, int num);
58 void do_add_atomic_word32(void *cpu_env, int num);
59 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1);
60 void do_nanotime(void *cpu_env, int num);
61
62 void unimpl_commpage(void *cpu_env, int num);
63
64 typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3,
65 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
66 uint32_t arg8);
67 typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1,
68 uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5,
69 uint32_t arg6, uint32_t arg7, uint32_t arg8);
70
71 #define HAS_PTR 0x10
72 #define NO_PTR 0x20
73 #define CALL_DIRECT 0x1
74 #define CALL_INDIRECT 0x2
75
76 #define COMMPAGE_ENTRY(name, nargs, offset, func, options) \
77 { #name, offset, nargs, options, (commpage_8args_function_t)func }
78
79 struct commpage_entry {
80 char * name;
81 int offset;
82 int nargs;
83 char options;
84 commpage_8args_function_t function;
85 };
86
87 static inline int commpage_code_num(struct commpage_entry *entry)
88 {
89 if((entry->options & HAS_PTR))
90 return entry->offset + 4;
91 else
92 return entry->offset;
93 }
94
95 static inline int commpage_is_indirect(struct commpage_entry *entry)
96 {
97 return !(entry->options & CALL_DIRECT);
98 }
99
100 /********************************************************************
101 * Commpage entry
102 */
103 static struct commpage_entry commpage_entries[] =
104 {
105 COMMPAGE_ENTRY(compare_and_swap32, 0, 0x080, do_compare_and_swap32, CALL_INDIRECT | HAS_PTR),
106 COMMPAGE_ENTRY(compare_and_swap64, 0, 0x0c0, do_compare_and_swap64, CALL_INDIRECT | HAS_PTR),
107 COMMPAGE_ENTRY(enqueue, 0, 0x100, unimpl_commpage, CALL_INDIRECT),
108 COMMPAGE_ENTRY(dequeue, 0, 0x140, unimpl_commpage, CALL_INDIRECT),
109 COMMPAGE_ENTRY(memory_barrier, 0, 0x180, unimpl_commpage, CALL_INDIRECT),
110 COMMPAGE_ENTRY(add_atomic_word32, 0, 0x1a0, do_add_atomic_word32, CALL_INDIRECT | HAS_PTR),
111 COMMPAGE_ENTRY(add_atomic_word64, 0, 0x1c0, unimpl_commpage, CALL_INDIRECT | HAS_PTR),
112
113 COMMPAGE_ENTRY(mach_absolute_time, 0, 0x200, unimpl_commpage, CALL_INDIRECT),
114 COMMPAGE_ENTRY(spinlock_try, 1, 0x220, unimpl_commpage, CALL_INDIRECT),
115 COMMPAGE_ENTRY(spinlock_lock, 1, 0x260, OSSpinLockLock, CALL_DIRECT),
116 COMMPAGE_ENTRY(spinlock_unlock, 1, 0x2a0, OSSpinLockUnlock, CALL_DIRECT),
117 COMMPAGE_ENTRY(pthread_getspecific, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT),
118 COMMPAGE_ENTRY(gettimeofday, 1, 0x2e0, do_cgettimeofday, CALL_INDIRECT),
119 COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x4e0, unimpl_commpage, CALL_INDIRECT),
120 COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520, unimpl_commpage, CALL_INDIRECT),
121 COMMPAGE_ENTRY(pthread_self, 0, 0x580, unimpl_commpage, CALL_INDIRECT),
122
123 COMMPAGE_ENTRY(relinquish, 0, 0x5c0, unimpl_commpage, CALL_INDIRECT),
124
125 #ifdef TARGET_I386
126 COMMPAGE_ENTRY(bts, 0, 0x5e0, unimpl_commpage, CALL_INDIRECT),
127 COMMPAGE_ENTRY(btc, 0, 0x5f0, unimpl_commpage, CALL_INDIRECT),
128 #endif
129
130 COMMPAGE_ENTRY(bzero, 2, 0x600, bzero, CALL_DIRECT),
131 COMMPAGE_ENTRY(bcopy, 3, 0x780, bcopy, CALL_DIRECT),
132 COMMPAGE_ENTRY(memcpy, 3, 0x7a0, memcpy, CALL_DIRECT),
133
134 #ifdef TARGET_I386
135 COMMPAGE_ENTRY(old_nanotime, 0, 0xf80, do_nanotime, CALL_INDIRECT),
136 COMMPAGE_ENTRY(memset_pattern, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
137 COMMPAGE_ENTRY(long_copy, 0, 0x1200, unimpl_commpage, CALL_INDIRECT),
138
139 COMMPAGE_ENTRY(sysintegrity, 0, 0x1600, unimpl_commpage, CALL_INDIRECT),
140
141 COMMPAGE_ENTRY(nanotime, 0, 0x1700, do_nanotime, CALL_INDIRECT),
142 #elif TARGET_PPC
143 COMMPAGE_ENTRY(compare_and_swap32b, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
144 COMMPAGE_ENTRY(compare_and_swap64b, 0, 0xfc0, unimpl_commpage, CALL_INDIRECT),
145 COMMPAGE_ENTRY(memset_pattern, 0, 0x1000, unimpl_commpage, CALL_INDIRECT),
146 COMMPAGE_ENTRY(bigcopy, 0, 0x1140, unimpl_commpage, CALL_INDIRECT),
147 #endif
148 };
149
150
151 /********************************************************************
152 * Commpage backdoor
153 */
154 static inline void print_commpage_entry(struct commpage_entry entry)
155 {
156 printf("@0x%x %s\n", entry.offset, entry.name);
157 }
158
159 static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry)
160 {
161 #ifdef TARGET_I386
162 char * commpage = (char*)(COMMPAGE_START+entry.offset);
163 int c = 0;
164 if(entry.options & HAS_PTR)
165 {
166 commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff;
167 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff;
168 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff;
169 commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff;
170 }
171 commpage[c++] = 0xcd;
172 commpage[c++] = 0x79; /* int 0x79 */
173 commpage[c++] = 0xc3; /* ret */
174 #else
175 qerror("can't install the commpage on this arch\n");
176 #endif
177 }
178
179 /********************************************************************
180 * Commpage initialization
181 */
182 void commpage_init(void)
183 {
184 #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(_ARCH_PPC) ^ defined(TARGET_PPC))
185 int i;
186 void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE,
187 PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
188 if((int)commpage != COMMPAGE_START)
189 qerror("can't allocate the commpage\n");
190
191 bzero(commpage, COMMPAGE_SIZE);
192
193 /* XXX: commpage data not handled */
194
195 for(i = 0; i < ARRAY_SIZE(commpage_entries); i++)
196 install_commpage_backdoor_for_entry(commpage_entries[i]);
197 #else
198 /* simply map our pages so they can be executed
199 XXX: we don't really want to do that since in the ppc on ppc situation we may
200 not able to run commpages host optimized instructions (like G5's on a G5),
201 hence this is sometimes a broken fix. */
202 page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID);
203 #endif
204 }
205
206 /********************************************************************
207 * Commpage implementation
208 */
209 void do_compare_and_swap32(void *cpu_env, int num)
210 {
211 #ifdef TARGET_I386
212 uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX];
213 uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX];
214 DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value);
215
216 if(value && old == tswap32(*value))
217 {
218 uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX];
219 *value = tswap32(new);
220 /* set zf flag */
221 ((CPUX86State*)cpu_env)->eflags |= 0x40;
222 }
223 else
224 {
225 ((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value);
226 /* unset zf flag */
227 ((CPUX86State*)cpu_env)->eflags &= ~0x40;
228 }
229 #else
230 qerror("do_compare_and_swap32 unimplemented");
231 #endif
232 }
233
234 void do_compare_and_swap64(void *cpu_env, int num)
235 {
236 #ifdef TARGET_I386
237 /* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */
238 uint64_t old, new, swapped_val;
239 uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI];
240 old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX];
241
242 DPRINTF("commpage: compare_and_swap64(%llx,new,%p)\n", old, value);
243 swapped_val = tswap64(*value);
244
245 if(old == swapped_val)
246 {
247 new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX];
248 *value = tswap64(new);
249 /* set zf flag */
250 ((CPUX86State*)cpu_env)->eflags |= 0x40;
251 }
252 else
253 {
254 ((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val);
255 ((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32);
256 /* unset zf flag */
257 ((CPUX86State*)cpu_env)->eflags &= ~0x40;
258 }
259 #else
260 qerror("do_compare_and_swap64 unimplemented");
261 #endif
262 }
263
264 void do_add_atomic_word32(void *cpu_env, int num)
265 {
266 #ifdef TARGET_I386
267 uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX];
268 uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX];
269 uint32_t swapped_value = tswap32(*value);
270
271 DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value);
272
273 /* old value in EAX */
274 ((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value;
275 *value = tswap32(swapped_value + amt);
276 #else
277 qerror("do_add_atomic_word32 unimplemented");
278 #endif
279 }
280
281 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1)
282 {
283 #ifdef TARGET_I386
284 extern int __commpage_gettimeofday(struct timeval *);
285 DPRINTF("commpage: gettimeofday(0x%x)\n", arg1);
286 struct timeval *time = (struct timeval *)arg1;
287 int ret = __commpage_gettimeofday(time);
288 tswap32s((uint32_t*)&time->tv_sec);
289 tswap32s((uint32_t*)&time->tv_usec);
290 ((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */
291 #else
292 qerror("do_gettimeofday unimplemented");
293 #endif
294 }
295
296 void do_nanotime(void *cpu_env, int num)
297 {
298 #ifdef TARGET_I386
299 uint64_t t = mach_absolute_time();
300 ((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff);
301 ((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff);
302 #else
303 qerror("do_nanotime unimplemented");
304 #endif
305 }
306
307 void unimpl_commpage(void *cpu_env, int num)
308 {
309 qerror("qemu: commpage function 0x%x not implemented\n", num);
310 }
311
312 /********************************************************************
313 * do_commpage - called by the main cpu loop
314 */
315 void
316 do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
317 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
318 uint32_t arg8)
319 {
320 int i, found = 0;
321
322 arg1 = tswap32(arg1);
323 arg2 = tswap32(arg2);
324 arg3 = tswap32(arg3);
325 arg4 = tswap32(arg4);
326 arg5 = tswap32(arg5);
327 arg6 = tswap32(arg6);
328 arg7 = tswap32(arg7);
329 arg8 = tswap32(arg8);
330
331 num = num-COMMPAGE_START-2;
332
333 for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) {
334 if( num == commpage_code_num(&commpage_entries[i]) )
335 {
336 DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]");
337 found = 1;
338 if(commpage_is_indirect(&commpage_entries[i]))
339 {
340 commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function;
341 function(cpu_env, num, arg1, arg2, arg3,
342 arg4, arg5, arg6, arg7, arg8);
343 }
344 else
345 {
346 commpage_entries[i].function(arg1, arg2, arg3,
347 arg4, arg5, arg6, arg7, arg8);
348 }
349 break;
350 }
351 }
352
353 if(!found)
354 {
355 gemu_log("qemu: commpage function 0x%x not defined\n", num);
356 gdb_handlesig (cpu_env, SIGTRAP);
357 exit(-1);
358 }
359 }
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