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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
1.1.1.2 ! root 18: * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
! 19: * MA 02110-1301, USA.
1.1 root 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
1.1.1.2 ! root 38: # define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
1.1 root 39: #else
1.1.1.2 ! root 40: # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
1.1 root 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: {
1.1.1.2 ! root 184: #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(_ARCH_PPC) ^ defined(TARGET_PPC))
1.1 root 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:
1.1.1.2 ! root 195: for(i = 0; i < ARRAY_SIZE(commpage_entries); i++)
1.1 root 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:
1.1.1.2 ! root 333: for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) {
1.1 root 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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