1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 20c44c2d0SPeter Zijlstra #ifndef _ASM_X86_RMWcc 30c44c2d0SPeter Zijlstra #define _ASM_X86_RMWcc 40c44c2d0SPeter Zijlstra 515beb1b7SAndy Shevchenko #include <linux/args.h> 6288e4521SPeter Zijlstra 7700b7c54SJan Beulich #define __CLOBBERS_MEM(clb...) "memory", ## clb 8df340524SKees Cook 9a0a12c3eSNick Desaulniers #ifndef __GCC_ASM_FLAG_OUTPUTS__ 10ba741e35SH. Peter Anvin 11ba741e35SH. Peter Anvin /* Use asm goto */ 120c44c2d0SPeter Zijlstra 13288e4521SPeter Zijlstra #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \ 14288e4521SPeter Zijlstra ({ \ 15288e4521SPeter Zijlstra bool c = false; \ 16*aaff74d8SLinus Torvalds asm goto (fullop "; j" #cc " %l[cc_label]" \ 17288e4521SPeter Zijlstra : : [var] "m" (_var), ## __VA_ARGS__ \ 18df340524SKees Cook : clobbers : cc_label); \ 19288e4521SPeter Zijlstra if (0) { \ 20288e4521SPeter Zijlstra cc_label: c = true; \ 21288e4521SPeter Zijlstra } \ 22288e4521SPeter Zijlstra c; \ 23288e4521SPeter Zijlstra }) 240c44c2d0SPeter Zijlstra 25a0a12c3eSNick Desaulniers #else /* defined(__GCC_ASM_FLAG_OUTPUTS__) */ 26ba741e35SH. Peter Anvin 27ba741e35SH. Peter Anvin /* Use flags output or a set instruction */ 280c44c2d0SPeter Zijlstra 29288e4521SPeter Zijlstra #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \ 30288e4521SPeter Zijlstra ({ \ 31117780eeSH. Peter Anvin bool c; \ 323c52b5c6SUros Bizjak asm volatile (fullop CC_SET(cc) \ 33288e4521SPeter Zijlstra : [var] "+m" (_var), CC_OUT(cc) (c) \ 34df340524SKees Cook : __VA_ARGS__ : clobbers); \ 35288e4521SPeter Zijlstra c; \ 36288e4521SPeter Zijlstra }) 370c44c2d0SPeter Zijlstra 38a0a12c3eSNick Desaulniers #endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) */ 390c44c2d0SPeter Zijlstra 40288e4521SPeter Zijlstra #define GEN_UNARY_RMWcc_4(op, var, cc, arg0) \ 41700b7c54SJan Beulich __GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM()) 42df340524SKees Cook 43288e4521SPeter Zijlstra #define GEN_UNARY_RMWcc_3(op, var, cc) \ 44288e4521SPeter Zijlstra GEN_UNARY_RMWcc_4(op, var, cc, "%[var]") 45288e4521SPeter Zijlstra 4615beb1b7SAndy Shevchenko #define GEN_UNARY_RMWcc(X...) CONCATENATE(GEN_UNARY_RMWcc_, COUNT_ARGS(X))(X) 47288e4521SPeter Zijlstra 48288e4521SPeter Zijlstra #define GEN_BINARY_RMWcc_6(op, var, cc, vcon, _val, arg0) \ 49288e4521SPeter Zijlstra __GEN_RMWcc(op " %[val], " arg0, var, cc, \ 50288e4521SPeter Zijlstra __CLOBBERS_MEM(), [val] vcon (_val)) 51288e4521SPeter Zijlstra 52288e4521SPeter Zijlstra #define GEN_BINARY_RMWcc_5(op, var, cc, vcon, val) \ 53288e4521SPeter Zijlstra GEN_BINARY_RMWcc_6(op, var, cc, vcon, val, "%[var]") 54288e4521SPeter Zijlstra 5515beb1b7SAndy Shevchenko #define GEN_BINARY_RMWcc(X...) CONCATENATE(GEN_BINARY_RMWcc_, COUNT_ARGS(X))(X) 56288e4521SPeter Zijlstra 57288e4521SPeter Zijlstra #define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, cc, clobbers...) \ 58288e4521SPeter Zijlstra __GEN_RMWcc(op " %[var]\n\t" suffix, var, cc, \ 59700b7c54SJan Beulich __CLOBBERS_MEM(clobbers)) 60df340524SKees Cook 61288e4521SPeter Zijlstra #define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, cc, vcon, _val, clobbers...)\ 62288e4521SPeter Zijlstra __GEN_RMWcc(op " %[val], %[var]\n\t" suffix, var, cc, \ 63288e4521SPeter Zijlstra __CLOBBERS_MEM(clobbers), [val] vcon (_val)) 64df340524SKees Cook 650c44c2d0SPeter Zijlstra #endif /* _ASM_X86_RMWcc */ 66