LXR qemu/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
  54void do_compare_and_swap32(void *cpu_env, int num);
  55void do_compare_and_swap64(void *cpu_env, int num);
  56void do_add_atomic_word32(void *cpu_env, int num);
  57void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1);
  58void do_nanotime(void *cpu_env, int num);
  59
  60void unimpl_commpage(void *cpu_env, int num);
  61
  62typedef 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);
  65typedef 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
  77struct commpage_entry {
  78    char * name;
  79    int offset;
  80    int nargs;
  81    char options;
  82    commpage_8args_function_t function;
  83};
  84
  85static 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
  93static inline int commpage_is_indirect(struct commpage_entry *entry)
  94{
  95    return !(entry->options & CALL_DIRECT);
  96}
  97
  98/********************************************************************
  99 *   Commpage entry
 100 */
 101static 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 */
 152static inline void print_commpage_entry(struct commpage_entry entry)
 153{
 154    printf("@0x%x %s\n", entry.offset, entry.name);
 155}
 156
 157static 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 */
 180void 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 */
 207void 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
 232void 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(%llx,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
 262void 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
 279void 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
 294void 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
 305void 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 */
 313void
 314do_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}
 358