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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef _ASM_X86_RMWcc
2#define _ASM_X86_RMWcc
3
4#define __CLOBBERS_MEM "memory"
5#define __CLOBBERS_MEM_CC_CX "memory", "cc", "cx"
6
7#if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CC_HAVE_ASM_GOTO)
8
9/* Use asm goto */
10
11#define __GEN_RMWcc(fullop, var, cc, clobbers, ...) \
12do { \
13 asm_volatile_goto (fullop "; j" #cc " %l[cc_label]" \
14 : : [counter] "m" (var), ## __VA_ARGS__ \
15 : clobbers : cc_label); \
16 return 0; \
17cc_label: \
18 return 1; \
19} while (0)
20
21#define __BINARY_RMWcc_ARG " %1, "
22
23
24#else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
25
26/* Use flags output or a set instruction */
27
28#define __GEN_RMWcc(fullop, var, cc, clobbers, ...) \
29do { \
30 bool c; \
31 asm volatile (fullop ";" CC_SET(cc) \
32 : [counter] "+m" (var), CC_OUT(cc) (c) \
33 : __VA_ARGS__ : clobbers); \
34 return c; \
35} while (0)
36
37#define __BINARY_RMWcc_ARG " %2, "
38
39#endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
40
41#define GEN_UNARY_RMWcc(op, var, arg0, cc) \
42 __GEN_RMWcc(op " " arg0, var, cc, __CLOBBERS_MEM)
43
44#define GEN_UNARY_SUFFIXED_RMWcc(op, suffix, var, arg0, cc) \
45 __GEN_RMWcc(op " " arg0 "\n\t" suffix, var, cc, \
46 __CLOBBERS_MEM_CC_CX)
47
48#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \
49 __GEN_RMWcc(op __BINARY_RMWcc_ARG arg0, var, cc, \
50 __CLOBBERS_MEM, vcon (val))
51
52#define GEN_BINARY_SUFFIXED_RMWcc(op, suffix, var, vcon, val, arg0, cc) \
53 __GEN_RMWcc(op __BINARY_RMWcc_ARG arg0 "\n\t" suffix, var, cc, \
54 __CLOBBERS_MEM_CC_CX, vcon (val))
55
56#endif /* _ASM_X86_RMWcc */