1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_RMWcc 3 #define _ASM_X86_RMWcc 4 5 #include <linux/args.h> 6 7 #define __CLOBBERS_MEM(clb...) "memory", ## clb 8 9 #ifndef __GCC_ASM_FLAG_OUTPUTS__ 10 11 /* Use asm goto */ 12 13 #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \ 14 ({ \ 15 bool c = false; \ 16 asm goto (fullop "; j" #cc " %l[cc_label]" \ 17 : : [var] "m" (_var), ## __VA_ARGS__ \ 18 : clobbers : cc_label); \ 19 if (0) { \ 20 cc_label: c = true; \ 21 } \ 22 c; \ 23 }) 24 25 #else /* defined(__GCC_ASM_FLAG_OUTPUTS__) */ 26 27 /* Use flags output or a set instruction */ 28 29 #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \ 30 ({ \ 31 bool c; \ 32 asm volatile (fullop CC_SET(cc) \ 33 : [var] "+m" (_var), CC_OUT(cc) (c) \ 34 : __VA_ARGS__ : clobbers); \ 35 c; \ 36 }) 37 38 #endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) */ 39 40 #define GEN_UNARY_RMWcc_4(op, var, cc, arg0) \ 41 __GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM()) 42 43 #define GEN_UNARY_RMWcc_3(op, var, cc) \ 44 GEN_UNARY_RMWcc_4(op, var, cc, "%[var]") 45 46 #define GEN_UNARY_RMWcc(X...) CONCATENATE(GEN_UNARY_RMWcc_, COUNT_ARGS(X))(X) 47 48 #define GEN_BINARY_RMWcc_6(op, var, cc, vcon, _val, arg0) \ 49 __GEN_RMWcc(op " %[val], " arg0, var, cc, \ 50 __CLOBBERS_MEM(), [val] vcon (_val)) 51 52 #define GEN_BINARY_RMWcc_5(op, var, cc, vcon, val) \ 53 GEN_BINARY_RMWcc_6(op, var, cc, vcon, val, "%[var]") 54 55 #define GEN_BINARY_RMWcc(X...) CONCATENATE(GEN_BINARY_RMWcc_, COUNT_ARGS(X))(X) 56 57 #define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, cc, clobbers...) \ 58 __GEN_RMWcc(op " %[var]\n\t" suffix, var, cc, \ 59 __CLOBBERS_MEM(clobbers)) 60 61 #define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, cc, vcon, _val, clobbers...)\ 62 __GEN_RMWcc(op " %[val], %[var]\n\t" suffix, var, cc, \ 63 __CLOBBERS_MEM(clobbers), [val] vcon (_val)) 64 65 #endif /* _ASM_X86_RMWcc */ 66