xref: /openbmc/linux/arch/x86/include/asm/rmwcc.h (revision aaff74d8)
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