관리-도구

편집 파일: rmwcc.h

/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_RMWcc #define _ASM_X86_RMWcc /* This counts to 12. Any more, it will return 13th argument. */ #define __RMWcc_ARGS(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _n, X...) _n #define RMWcc_ARGS(X...) __RMWcc_ARGS(, ##X, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) #define __RMWcc_CONCAT(a, b) a ## b #define RMWcc_CONCAT(a, b) __RMWcc_CONCAT(a, b) #define __CLOBBERS_MEM(clb...) "memory", ## clb #ifndef __GCC_ASM_FLAG_OUTPUTS__ /* Use asm goto */ #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \ ({ \ bool c = false; \ asm_volatile_goto (fullop "; j" #cc " %l[cc_label]" \ : : [var] "m" (_var), ## __VA_ARGS__ \ : clobbers : cc_label); \ if (0) { \ cc_label: c = true; \ } \ c; \ }) #else /* defined(__GCC_ASM_FLAG_OUTPUTS__) */ /* Use flags output or a set instruction */ #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \ ({ \ bool c; \ asm volatile (fullop CC_SET(cc) \ : [var] "+m" (_var), CC_OUT(cc) (c) \ : __VA_ARGS__ : clobbers); \ c; \ }) #endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) */ #define GEN_UNARY_RMWcc_4(op, var, cc, arg0) \ __GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM()) #define GEN_UNARY_RMWcc_3(op, var, cc) \ GEN_UNARY_RMWcc_4(op, var, cc, "%[var]") #define GEN_UNARY_RMWcc(X...) RMWcc_CONCAT(GEN_UNARY_RMWcc_, RMWcc_ARGS(X))(X) #define GEN_BINARY_RMWcc_6(op, var, cc, vcon, _val, arg0) \ __GEN_RMWcc(op " %[val], " arg0, var, cc, \ __CLOBBERS_MEM(), [val] vcon (_val)) #define GEN_BINARY_RMWcc_5(op, var, cc, vcon, val) \ GEN_BINARY_RMWcc_6(op, var, cc, vcon, val, "%[var]") #define GEN_BINARY_RMWcc(X...) RMWcc_CONCAT(GEN_BINARY_RMWcc_, RMWcc_ARGS(X))(X) #define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, cc, clobbers...) \ __GEN_RMWcc(op " %[var]\n\t" suffix, var, cc, \ __CLOBBERS_MEM(clobbers)) #define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, cc, vcon, _val, clobbers...)\ __GEN_RMWcc(op " %[val], %[var]\n\t" suffix, var, cc, \ __CLOBBERS_MEM(clobbers), [val] vcon (_val)) #endif /* _ASM_X86_RMWcc */