darwin-user/commpage.c

   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 }