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 */
71