libs/port/interlocked.c

   1 /*
   2  * interlocked functions
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #ifdef __i386__
  25
  26 #ifdef __GNUC__
  27
  28 __ASM_GLOBAL_FUNC(interlocked_cmpxchg,
  29                   "movl 12(%esp),%eax\n\t"
  30                   "movl 8(%esp),%ecx\n\t"
  31                   "movl 4(%esp),%edx\n\t"
  32                   "lock; cmpxchgl %ecx,(%edx)\n\t"
  33                   "ret");
  34 __ASM_GLOBAL_FUNC(interlocked_cmpxchg_ptr,
  35                   "movl 12(%esp),%eax\n\t"
  36                   "movl 8(%esp),%ecx\n\t"
  37                   "movl 4(%esp),%edx\n\t"
  38                   "lock; cmpxchgl %ecx,(%edx)\n\t"
  39                   "ret");
  40 __ASM_GLOBAL_FUNC(interlocked_xchg,
  41                   "movl 8(%esp),%eax\n\t"
  42                   "movl 4(%esp),%edx\n\t"
  43                   "lock; xchgl %eax,(%edx)\n\t"
  44                   "ret");
  45 __ASM_GLOBAL_FUNC(interlocked_xchg_ptr,
  46                   "movl 8(%esp),%eax\n\t"
  47                   "movl 4(%esp),%edx\n\t"
  48                   "lock; xchgl %eax,(%edx)\n\t"
  49                   "ret");
  50 __ASM_GLOBAL_FUNC(interlocked_xchg_add,
  51                   "movl 8(%esp),%eax\n\t"
  52                   "movl 4(%esp),%edx\n\t"
  53                   "lock; xaddl %eax,(%edx)\n\t"
  54                   "ret");
  55
  56 #elif defined(_MSC_VER)
  57
  58 __declspec(naked) int interlocked_cmpxchg( int *dest, int xchg, int compare )
  59 {
  60     __asm mov eax, 12[esp];
  61     __asm mov ecx, 8[esp];
  62     __asm mov edx, 4[esp];
  63     __asm lock cmpxchg [edx], ecx;
  64     __asm ret;
  65 }
  66
  67 __declspec(naked) void *interlocked_cmpxchg_ptr( void **dest, void *xchg, void *compare )
  68 {
  69     __asm mov eax, 12[esp];
  70     __asm mov ecx, 8[esp];
  71     __asm mov edx, 4[esp];
  72     __asm lock cmpxchg [edx], ecx;
  73     __asm ret;
  74 }
  75
  76 __declspec(naked) int interlocked_xchg( int *dest, int val )
  77 {
  78     __asm mov eax, 8[esp];
  79     __asm mov edx, 4[esp];
  80     __asm lock xchg [edx], eax;
  81     __asm ret;
  82 }
  83
  84 __declspec(naked) void *interlocked_xchg_ptr( void **dest, void *val )
  85 {
  86     __asm mov eax, 8[esp];
  87     __asm mov edx, 4[esp];
  88     __asm lock xchg [edx], eax;
  89     __asm ret;
  90 }
  91
  92 __declspec(naked) int interlocked_xchg_add( int *dest, int incr )
  93 {
  94     __asm mov eax, 8[esp];
  95     __asm mov edx, 4[esp];
  96     __asm lock xadd [edx], eax;
  97     __asm ret;
  98 }
  99
 100 #else
 101 # error You must implement the interlocked* functions for your compiler
 102 #endif
 103
 104 #elif defined(__x86_64__)
 105
 106 #ifdef __GNUC__
 107
 108 __ASM_GLOBAL_FUNC(interlocked_cmpxchg,
 109                   "mov %edx, %eax\n\t"
 110                   "lock cmpxchgl %esi,(%rdi)\n\t"
 111                   "ret");
 112 __ASM_GLOBAL_FUNC(interlocked_cmpxchg_ptr,
 113                   "mov %rdx, %rax\n\t"
 114                   "lock cmpxchgq %rsi,(%rdi)\n\t"
 115                   "ret");
 116 __ASM_GLOBAL_FUNC(interlocked_xchg,
 117                   "mov %esi, %eax\n\t"
 118                   "lock xchgl %eax, (%rdi)\n\t"
 119                   "ret");
 120 __ASM_GLOBAL_FUNC(interlocked_xchg_ptr,
 121                   "mov %rsi, %rax\n\t"
 122                   "lock xchgq %rax,(%rdi)\n\t"
 123                   "ret");
 124 __ASM_GLOBAL_FUNC(interlocked_xchg_add,
 125                   "mov %esi, %eax\n\t"
 126                   "lock xaddl %eax, (%rdi)\n\t"
 127                   "ret");
 128
 129 #else
 130 # error You must implement the interlocked* functions for your compiler
 131 #endif
 132
 133 #elif defined(__powerpc__)
 134 void* interlocked_cmpxchg_ptr( void **dest, void* xchg, void* compare)
 135 {
 136     void *ret = 0;
 137     void *scratch;
 138     __asm__ __volatile__(
 139         "0:    lwarx %0,0,%2\n"
 140         "      xor. %1,%4,%0\n"
 141         "      bne 1f\n"
 142         "      stwcx. %3,0,%2\n"
 143         "      bne- 0b\n"
 144         "      isync\n"
 145         "1:    "
 146         : "=&r"(ret), "=&r"(scratch)
 147         : "r"(dest), "r"(xchg), "r"(compare)
 148         : "cr0","memory");
 149     return ret;
 150 }
 151
 152 int interlocked_cmpxchg( int *dest, int xchg, int compare)
 153 {
 154     int ret = 0;
 155     int scratch;
 156     __asm__ __volatile__(
 157         "0:    lwarx %0,0,%2\n"
 158         "      xor. %1,%4,%0\n"
 159         "      bne 1f\n"
 160         "      stwcx. %3,0,%2\n"
 161         "      bne- 0b\n"
 162         "      isync\n"
 163         "1:    "
 164         : "=&r"(ret), "=&r"(scratch)
 165         : "r"(dest), "r"(xchg), "r"(compare)
 166         : "cr0","memory","r0");
 167     return ret;
 168 }
 169
 170 int interlocked_xchg_add( int *dest, int incr )
 171 {
 172     int ret = 0;
 173     int zero = 0;
 174     __asm__ __volatile__(
 175         "0:    lwarx %0, %3, %1\n"
 176         "      add %0, %2, %0\n"
 177         "      stwcx. %0, %3, %1\n"
 178         "      bne- 0b\n"
 179         "      isync\n"
 180         : "=&r" (ret)
 181         : "r"(dest), "r"(incr), "r"(zero)
 182         : "cr0", "memory", "r0"
 183     );
 184     return ret-incr;
 185 }
 186
 187 int interlocked_xchg( int* dest, int val )
 188 {
 189     int ret = 0;
 190     __asm__ __volatile__(
 191         "0:    lwarx %0,0,%1\n"
 192         "      stwcx. %2,0,%1\n"
 193         "      bne- 0b\n"
 194         "      isync\n"
 195         : "=&r"(ret)
 196         : "r"(dest), "r"(val)
 197         : "cr0","memory","r0");
 198     return ret;
 199 }
 200
 201 void* interlocked_xchg_ptr( void** dest, void* val )
 202 {
 203     void *ret = NULL;
 204     __asm__ __volatile__(
 205         "0:    lwarx %0,0,%1\n"
 206         "      stwcx. %2,0,%1\n"
 207         "      bne- 0b \n"
 208         "      isync\n"
 209         : "=&r"(ret)
 210         : "r"(dest), "r"(val)
 211         : "cr0","memory","r0");
 212     return ret;
 213 }
 214
 215 #elif defined(__sparc__) && defined(__sun__)
 216
 217 /*
 218  * As the earlier Sparc processors lack necessary atomic instructions,
 219  * I'm simply falling back to the library-provided _lwp_mutex routines
 220  * to ensure mutual exclusion in a way appropriate for the current
 221  * architecture.
 222  *
 223  * FIXME:  If we have the compare-and-swap instruction (Sparc v9 and above)
 224  *         we could use this to speed up the Interlocked operations ...
 225  */
 226 #include <synch.h>
 227 static lwp_mutex_t interlocked_mutex = DEFAULTMUTEX;
 228
 229 int interlocked_cmpxchg( int *dest, int xchg, int compare )
 230 {
 231     _lwp_mutex_lock( &interlocked_mutex );
 232     if (*dest == compare) *dest = xchg;
 233     else compare = *dest;
 234     _lwp_mutex_unlock( &interlocked_mutex );
 235     return compare;
 236 }
 237
 238 void *interlocked_cmpxchg_ptr( void **dest, void *xchg, void *compare )
 239 {
 240     _lwp_mutex_lock( &interlocked_mutex );
 241     if (*dest == compare) *dest = xchg;
 242     else compare = *dest;
 243     _lwp_mutex_unlock( &interlocked_mutex );
 244     return compare;
 245 }
 246
 247 int interlocked_xchg( int *dest, int val )
 248 {
 249     int retv;
 250     _lwp_mutex_lock( &interlocked_mutex );
 251     retv = *dest;
 252     *dest = val;
 253     _lwp_mutex_unlock( &interlocked_mutex );
 254     return retv;
 255 }
 256
 257 void *interlocked_xchg_ptr( void **dest, void *val )
 258 {
 259     void *retv;
 260     _lwp_mutex_lock( &interlocked_mutex );
 261     retv = *dest;
 262     *dest = val;
 263     _lwp_mutex_unlock( &interlocked_mutex );
 264     return retv;
 265 }
 266
 267 int interlocked_xchg_add( int *dest, int incr )
 268 {
 269     int retv;
 270     _lwp_mutex_lock( &interlocked_mutex );
 271     retv = *dest;
 272     *dest += incr;
 273     _lwp_mutex_unlock( &interlocked_mutex );
 274     return retv;
 275 }
 276
 277 #elif defined(__ALPHA__) && defined(__GNUC__)
 278
 279 __ASM_GLOBAL_FUNC(interlocked_cmpxchg,
 280                   "L0cmpxchg:\n\t"
 281                   "ldl_l $0,0($16)\n\t"
 282                   "cmpeq $0,$18,$1\n\t"
 283                   "beq   $1,L1cmpxchg\n\t"
 284                   "mov   $17,$0\n\t"
 285                   "stl_c $0,0($16)\n\t"
 286                   "beq   $0,L0cmpxchg\n\t"
 287                   "mov   $18,$0\n"
 288                   "L1cmpxchg:\n\t"
 289                   "mb");
 290
 291 __ASM_GLOBAL_FUNC(interlocked_cmpxchg_ptr,
 292                   "L0cmpxchg_ptr:\n\t"
 293                   "ldq_l $0,0($16)\n\t"
 294                   "cmpeq $0,$18,$1\n\t"
 295                   "beq   $1,L1cmpxchg_ptr\n\t"
 296                   "mov   $17,$0\n\t"
 297                   "stq_c $0,0($16)\n\t"
 298                   "beq   $0,L0cmpxchg_ptr\n\t"
 299                   "mov   $18,$0\n"
 300                   "L1cmpxchg_ptr:\n\t"
 301                   "mb");
 302
 303 __ASM_GLOBAL_FUNC(interlocked_xchg,
 304                   "L0xchg:\n\t"
 305                   "ldl_l $0,0($16)\n\t"
 306                   "mov   $17,$1\n\t"
 307                   "stl_c $1,0($16)\n\t"
 308                   "beq   $1,L0xchg\n\t"
 309                   "mb");
 310
 311 __ASM_GLOBAL_FUNC(interlocked_xchg_ptr,
 312                   "L0xchg_ptr:\n\t"
 313                   "ldq_l $0,0($16)\n\t"
 314                   "mov   $17,$1\n\t"
 315                   "stq_c $1,0($16)\n\t"
 316                   "beq   $1,L0xchg_ptr\n\t"
 317                   "mb");
 318
 319 __ASM_GLOBAL_FUNC(interlocked_xchg_add,
 320                   "L0xchg_add:\n\t"
 321                   "ldl_l $0,0($16)\n\t"
 322                   "addl  $0,$17,$1\n\t"
 323                   "stl_c $1,0($16)\n\t"
 324                   "beq   $1,L0xchg_add\n\t"
 325                   "mb");
 326
 327 #else
 328 # error You must implement the interlocked* functions for your CPU
 329 #endif