| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 */ |