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., 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 }