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, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include <fcntl.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23
  24 #include <mach/message.h>
  25 #include <mach/mach.h>
  26 #include <mach/mach_time.h>
  27 #include <sys/time.h>
  28 #include <sys/mman.h>
  29 #include <libkern/OSAtomic.h>
  30
  31 #include "qemu.h"
  32
  33 //#define DEBUG_COMMPAGE
  34
  35 #ifdef DEBUG_COMMPAGE
  36 # define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
  37 #else
  38 # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
  39 #endif
  40
  41 /********************************************************************
  42  *   Commpage definitions
  43  */
  44 #ifdef TARGET_I386
  45 /* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */
  46 # define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */
  47 # define COMMPAGE_SIZE  (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */
  48 #elif defined(TARGET_PPC)
  49 /* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */
  50 # define COMMPAGE_START (-8*4096)
  51 # define COMMPAGE_SIZE  (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */
  52 #endif
  53
  54 void do_compare_and_swap32(void *cpu_env, int num);
  55 void do_compare_and_swap64(void *cpu_env, int num);
  56 void do_add_atomic_word32(void *cpu_env, int num);
  57 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1);
  58 void do_nanotime(void *cpu_env, int num);
  59
  60 void unimpl_commpage(void *cpu_env, int num);
  61
  62 typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3,
  63                 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
  64                 uint32_t arg8);
  65 typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1,
  66                 uint32_t arg2, uint32_t arg3,  uint32_t arg4, uint32_t arg5,
  67                 uint32_t arg6, uint32_t arg7, uint32_t arg8);
  68
  69 #define HAS_PTR  0x10
  70 #define NO_PTR   0x20
  71 #define CALL_DIRECT   0x1
  72 #define CALL_INDIRECT 0x2
  73
  74 #define COMMPAGE_ENTRY(name, nargs, offset, func, options) \
  75     { #name, offset, nargs, options, (commpage_8args_function_t)func }
  76
  77 struct commpage_entry {
  78     char * name;
  79     int offset;
  80     int nargs;
  81     char options;
  82     commpage_8args_function_t function;
  83 };
  84
  85 static inline int commpage_code_num(struct commpage_entry *entry)
  86 {
  87     if((entry->options & HAS_PTR))
  88         return entry->offset + 4;
  89     else
  90         return entry->offset;
  91 }
  92
  93 static inline int commpage_is_indirect(struct commpage_entry *entry)
  94 {
  95     return !(entry->options & CALL_DIRECT);
  96 }
  97
  98 /********************************************************************
  99  *   Commpage entry
 100  */
 101 static struct commpage_entry commpage_entries[] =
 102 {
 103     COMMPAGE_ENTRY(compare_and_swap32,    0, 0x080,  do_compare_and_swap32, CALL_INDIRECT | HAS_PTR),
 104     COMMPAGE_ENTRY(compare_and_swap64,    0, 0x0c0,  do_compare_and_swap64, CALL_INDIRECT | HAS_PTR),
 105     COMMPAGE_ENTRY(enqueue,               0, 0x100,  unimpl_commpage,       CALL_INDIRECT),
 106     COMMPAGE_ENTRY(dequeue,               0, 0x140,  unimpl_commpage,       CALL_INDIRECT),
 107     COMMPAGE_ENTRY(memory_barrier,        0, 0x180,  unimpl_commpage,       CALL_INDIRECT),
 108     COMMPAGE_ENTRY(add_atomic_word32,     0, 0x1a0,  do_add_atomic_word32,  CALL_INDIRECT | HAS_PTR),
 109     COMMPAGE_ENTRY(add_atomic_word64,     0, 0x1c0,  unimpl_commpage,       CALL_INDIRECT | HAS_PTR),
 110
 111     COMMPAGE_ENTRY(mach_absolute_time,    0, 0x200,  unimpl_commpage,       CALL_INDIRECT),
 112     COMMPAGE_ENTRY(spinlock_try,          1, 0x220,  unimpl_commpage,       CALL_INDIRECT),
 113     COMMPAGE_ENTRY(spinlock_lock,         1, 0x260,  OSSpinLockLock,        CALL_DIRECT),
 114     COMMPAGE_ENTRY(spinlock_unlock,       1, 0x2a0,  OSSpinLockUnlock,      CALL_DIRECT),
 115     COMMPAGE_ENTRY(pthread_getspecific,   0, 0x2c0,  unimpl_commpage,       CALL_INDIRECT),
 116     COMMPAGE_ENTRY(gettimeofday,          1, 0x2e0,  do_cgettimeofday,      CALL_INDIRECT),
 117     COMMPAGE_ENTRY(sys_dcache_flush,      0, 0x4e0,  unimpl_commpage,       CALL_INDIRECT),
 118     COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520,  unimpl_commpage,       CALL_INDIRECT),
 119     COMMPAGE_ENTRY(pthread_self,          0, 0x580,  unimpl_commpage,       CALL_INDIRECT),
 120
 121     COMMPAGE_ENTRY(relinquish,            0, 0x5c0,  unimpl_commpage,       CALL_INDIRECT),
 122
 123 #ifdef TARGET_I386
 124     COMMPAGE_ENTRY(bts,                   0, 0x5e0,  unimpl_commpage,       CALL_INDIRECT),
 125     COMMPAGE_ENTRY(btc,                   0, 0x5f0,  unimpl_commpage,       CALL_INDIRECT),
 126 #endif
 127
 128     COMMPAGE_ENTRY(bzero,                 2, 0x600,  bzero,                 CALL_DIRECT),
 129     COMMPAGE_ENTRY(bcopy,                 3, 0x780,  bcopy,                 CALL_DIRECT),
 130     COMMPAGE_ENTRY(memcpy,                3, 0x7a0,  memcpy,                CALL_DIRECT),
 131
 132 #ifdef TARGET_I386
 133     COMMPAGE_ENTRY(old_nanotime,          0, 0xf80,  do_nanotime,           CALL_INDIRECT),
 134     COMMPAGE_ENTRY(memset_pattern,        0, 0xf80,  unimpl_commpage,       CALL_INDIRECT),
 135     COMMPAGE_ENTRY(long_copy,             0, 0x1200, unimpl_commpage,       CALL_INDIRECT),
 136
 137     COMMPAGE_ENTRY(sysintegrity,          0, 0x1600, unimpl_commpage,       CALL_INDIRECT),
 138
 139     COMMPAGE_ENTRY(nanotime,              0, 0x1700, do_nanotime,           CALL_INDIRECT),
 140 #elif TARGET_PPC
 141     COMMPAGE_ENTRY(compare_and_swap32b,   0, 0xf80,  unimpl_commpage,       CALL_INDIRECT),
 142     COMMPAGE_ENTRY(compare_and_swap64b,   0, 0xfc0,  unimpl_commpage,       CALL_INDIRECT),
 143     COMMPAGE_ENTRY(memset_pattern,        0, 0x1000, unimpl_commpage,       CALL_INDIRECT),
 144     COMMPAGE_ENTRY(bigcopy,               0, 0x1140, unimpl_commpage,       CALL_INDIRECT),
 145 #endif
 146 };
 147
 148
 149 /********************************************************************
 150  *   Commpage backdoor
 151  */
 152 static inline void print_commpage_entry(struct commpage_entry entry)
 153 {
 154     printf("@0x%x %s\n", entry.offset, entry.name);
 155 }
 156
 157 static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry)
 158 {
 159 #ifdef TARGET_I386
 160     char * commpage = (char*)(COMMPAGE_START+entry.offset);
 161     int c = 0;
 162     if(entry.options & HAS_PTR)
 163     {
 164         commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff;
 165         commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff;
 166         commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff;
 167         commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff;
 168     }
 169     commpage[c++] = 0xcd;
 170     commpage[c++] = 0x79; /* int 0x79 */
 171     commpage[c++] = 0xc3; /* ret */
 172 #else
 173     qerror("can't install the commpage on this arch\n");
 174 #endif
 175 }
 176
 177 /********************************************************************
 178  *   Commpage initialization
 179  */
 180 void commpage_init(void)
 181 {
 182 #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(_ARCH_PPC) ^ defined(TARGET_PPC))
 183     int i;
 184     void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE,
 185                            PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
 186     if((int)commpage != COMMPAGE_START)
 187         qerror("can't allocate the commpage\n");
 188
 189     bzero(commpage, COMMPAGE_SIZE);
 190
 191     /* XXX: commpage data not handled */
 192
 193     for(i = 0; i < ARRAY_SIZE(commpage_entries); i++)
 194         install_commpage_backdoor_for_entry(commpage_entries[i]);
 195 #else
 196     /* simply map our pages so they can be executed
 197        XXX: we don't really want to do that since in the ppc on ppc situation we may
 198        not able to run commpages host optimized instructions (like G5's on a G5),
 199        hence this is sometimes a broken fix. */
 200     page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID);
 201 #endif
 202 }
 203
 204 /********************************************************************
 205  *   Commpage implementation
 206  */
 207 void do_compare_and_swap32(void *cpu_env, int num)
 208 {
 209 #ifdef TARGET_I386
 210     uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX];
 211     uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX];
 212     DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value);
 213
 214     if(value && old == tswap32(*value))
 215     {
 216         uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX];
 217         *value = tswap32(new);
 218         /* set zf flag */
 219         ((CPUX86State*)cpu_env)->eflags |= 0x40;
 220     }
 221     else
 222     {
 223         ((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value);
 224         /* unset zf flag */
 225         ((CPUX86State*)cpu_env)->eflags &= ~0x40;
 226     }
 227 #else
 228     qerror("do_compare_and_swap32 unimplemented");
 229 #endif
 230 }
 231
 232 void do_compare_and_swap64(void *cpu_env, int num)
 233 {
 234 #ifdef TARGET_I386
 235     /* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */
 236     uint64_t old, new, swapped_val;
 237     uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI];
 238     old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX];
 239
 240     DPRINTF("commpage: compare_and_swap64(%" PRIx64 ",new,%p)\n", old, value);
 241     swapped_val = tswap64(*value);
 242
 243     if(old == swapped_val)
 244     {
 245         new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX];
 246         *value = tswap64(new);
 247         /* set zf flag */
 248         ((CPUX86State*)cpu_env)->eflags |= 0x40;
 249     }
 250     else
 251     {
 252         ((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val);
 253         ((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32);
 254         /* unset zf flag */
 255         ((CPUX86State*)cpu_env)->eflags &= ~0x40;
 256     }
 257 #else
 258     qerror("do_compare_and_swap64 unimplemented");
 259 #endif
 260 }
 261
 262 void do_add_atomic_word32(void *cpu_env, int num)
 263 {
 264 #ifdef TARGET_I386
 265     uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX];
 266     uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX];
 267     uint32_t swapped_value = tswap32(*value);
 268
 269     DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value);
 270
 271     /* old value in EAX */
 272     ((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value;
 273     *value = tswap32(swapped_value + amt);
 274 #else
 275     qerror("do_add_atomic_word32 unimplemented");
 276 #endif
 277 }
 278
 279 void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1)
 280 {
 281 #ifdef TARGET_I386
 282     extern int __commpage_gettimeofday(struct timeval *);
 283     DPRINTF("commpage: gettimeofday(0x%x)\n", arg1);
 284     struct timeval *time = (struct timeval *)arg1;
 285     int ret = __commpage_gettimeofday(time);
 286     tswap32s((uint32_t*)&time->tv_sec);
 287     tswap32s((uint32_t*)&time->tv_usec);
 288     ((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */
 289 #else
 290     qerror("do_gettimeofday unimplemented");
 291 #endif
 292 }
 293
 294 void do_nanotime(void *cpu_env, int num)
 295 {
 296 #ifdef TARGET_I386
 297     uint64_t t = mach_absolute_time();
 298     ((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff);
 299     ((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff);
 300 #else
 301     qerror("do_nanotime unimplemented");
 302 #endif
 303 }
 304
 305 void unimpl_commpage(void *cpu_env, int num)
 306 {
 307     qerror("qemu: commpage function 0x%x not implemented\n", num);
 308 }
 309
 310 /********************************************************************
 311  *   do_commpage - called by the main cpu loop
 312  */
 313 void
 314 do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
 315                 uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
 316                 uint32_t arg8)
 317 {
 318     int i, found = 0;
 319
 320     arg1 = tswap32(arg1);
 321     arg2 = tswap32(arg2);
 322     arg3 = tswap32(arg3);
 323     arg4 = tswap32(arg4);
 324     arg5 = tswap32(arg5);
 325     arg6 = tswap32(arg6);
 326     arg7 = tswap32(arg7);
 327     arg8 = tswap32(arg8);
 328
 329     num = num-COMMPAGE_START-2;
 330
 331     for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) {
 332         if( num == commpage_code_num(&commpage_entries[i]) )
 333         {
 334             DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]");
 335             found = 1;
 336             if(commpage_is_indirect(&commpage_entries[i]))
 337             {
 338                 commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function;
 339                 function(cpu_env, num, arg1, arg2, arg3,
 340                     arg4, arg5, arg6, arg7, arg8);
 341             }
 342             else
 343             {
 344                 commpage_entries[i].function(arg1, arg2, arg3,
 345                     arg4, arg5, arg6, arg7, arg8);
 346             }
 347             break;
 348         }
 349     }
 350
 351     if(!found)
 352     {
 353         gemu_log("qemu: commpage function 0x%x not defined\n", num);
 354         gdb_handlesig (cpu_env, SIGTRAP);
 355         exit(-1);
 356     }
 357 }