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1.1 root 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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