ths | 831b782 | 2007-01-18 20:06:33 +0000 | [diff] [blame] | 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), |
bellard | 2a25282 | 2007-02-05 19:50:01 +0000 | [diff] [blame] | 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), |
ths | 831b782 | 2007-01-18 20:06:33 +0000 | [diff] [blame] | 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 | { |
bellard | 2a25282 | 2007-02-05 19:50:01 +0000 | [diff] [blame] | 308 | qerror("qemu: commpage function 0x%x not implemented\n", num); |
ths | 831b782 | 2007-01-18 20:06:33 +0000 | [diff] [blame] | 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 | } |