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

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_RMWcc
   3 #define _ASM_X86_RMWcc
   4 
   5 /* This counts to 12. Any more, it will return 13th argument. */
   6 #define __RMWcc_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n
   7 #define RMWcc_ARGS(X...) __RMWcc_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
   8 
   9 #define __RMWcc_CONCAT(a, b) a ## b
  10 #define RMWcc_CONCAT(a, b) __RMWcc_CONCAT(a, b)
  11 
  12 #define __CLOBBERS_MEM(clb...)  "memory", ## clb
  13 
  14 #if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CONFIG_CC_HAS_ASM_GOTO)
  15 
  16 /* Use asm goto */
  17 
  18 #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...)                    \
  19 ({                                                                      \
  20         bool c = false;                                                 \
  21         asm_volatile_goto (fullop "; j" #cc " %l[cc_label]"             \
  22                         : : [var] "m" (_var), ## __VA_ARGS__            \
  23                         : clobbers : cc_label);                         \
  24         if (0) {                                                        \
  25 cc_label:       c = true;                                               \
  26         }                                                               \
  27         c;                                                              \
  28 })
  29 
  30 #else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CONFIG_CC_HAS_ASM_GOTO) */
  31 
  32 /* Use flags output or a set instruction */
  33 
  34 #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...)                    \
  35 ({                                                                      \
  36         bool c;                                                         \
  37         asm volatile (fullop CC_SET(cc)                                 \
  38                         : [var] "+m" (_var), CC_OUT(cc) (c)             \
  39                         : __VA_ARGS__ : clobbers);                      \
  40         c;                                                              \
  41 })
  42 
  43 #endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CONFIG_CC_HAS_ASM_GOTO) */
  44 
  45 #define GEN_UNARY_RMWcc_4(op, var, cc, arg0)                            \
  46         __GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM())
  47 
  48 #define GEN_UNARY_RMWcc_3(op, var, cc)                                  \
  49         GEN_UNARY_RMWcc_4(op, var, cc, "%[var]")
  50 
  51 #define GEN_UNARY_RMWcc(X...) RMWcc_CONCAT(GEN_UNARY_RMWcc_, RMWcc_ARGS(X))(X)
  52 
  53 #define GEN_BINARY_RMWcc_6(op, var, cc, vcon, _val, arg0)               \
  54         __GEN_RMWcc(op " %[val], " arg0, var, cc,                       \
  55                     __CLOBBERS_MEM(), [val] vcon (_val))
  56 
  57 #define GEN_BINARY_RMWcc_5(op, var, cc, vcon, val)                      \
  58         GEN_BINARY_RMWcc_6(op, var, cc, vcon, val, "%[var]")
  59 
  60 #define GEN_BINARY_RMWcc(X...) RMWcc_CONCAT(GEN_BINARY_RMWcc_, RMWcc_ARGS(X))(X)
  61 
  62 #define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, cc, clobbers...)      \
  63         __GEN_RMWcc(op " %[var]\n\t" suffix, var, cc,                   \
  64                     __CLOBBERS_MEM(clobbers))
  65 
  66 #define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, cc, vcon, _val, clobbers...)\
  67         __GEN_RMWcc(op " %[val], %[var]\n\t" suffix, var, cc,           \
  68                     __CLOBBERS_MEM(clobbers), [val] vcon (_val))
  69 
  70 #endif /* _ASM_X86_RMWcc */