rmwcc.h (2277B)
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) { \ 25cc_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 */