tools/arch/x86/include/asm/rmwcc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _TOOLS_LINUX_ASM_X86_RMWcc
   3 #define _TOOLS_LINUX_ASM_X86_RMWcc
   4
   5 #ifdef CONFIG_CC_HAS_ASM_GOTO
   6
   7 #define __GEN_RMWcc(fullop, var, cc, ...)                               \
   8 do {                                                                    \
   9         asm_volatile_goto (fullop "; j" cc " %l[cc_label]"              \
  10                         : : "m" (var), ## __VA_ARGS__                   \
  11                         : "memory" : cc_label);                         \
  12         return 0;                                                       \
  13 cc_label:                                                               \
  14         return 1;                                                       \
  15 } while (0)
  16
  17 #define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
  18         __GEN_RMWcc(op " " arg0, var, cc)
  19
  20 #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
  21         __GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))
  22
  23 #else /* !CONFIG_CC_HAS_ASM_GOTO */
  24
  25 #define __GEN_RMWcc(fullop, var, cc, ...)                               \
  26 do {                                                                    \
  27         char c;                                                         \
  28         asm volatile (fullop "; set" cc " %1"                           \
  29                         : "+m" (var), "=qm" (c)                         \
  30                         : __VA_ARGS__ : "memory");                      \
  31         return c != 0;                                                  \
  32 } while (0)
  33
  34 #define GEN_UNARY_RMWcc(op, var, arg0, cc)                              \
  35         __GEN_RMWcc(op " " arg0, var, cc)
  36
  37 #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                  \
  38         __GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))
  39
  40 #endif /* CONFIG_CC_HAS_ASM_GOTO */
  41
  42 #endif /* _TOOLS_LINUX_ASM_X86_RMWcc */