diff options
Diffstat (limited to 'arch/x86/include/asm/rmwcc.h')
-rw-r--r-- | arch/x86/include/asm/rmwcc.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/x86/include/asm/rmwcc.h b/arch/x86/include/asm/rmwcc.h new file mode 100644 index 000000000000..1ff990f1de8e --- /dev/null +++ b/arch/x86/include/asm/rmwcc.h | |||
@@ -0,0 +1,41 @@ | |||
1 | #ifndef _ASM_X86_RMWcc | ||
2 | #define _ASM_X86_RMWcc | ||
3 | |||
4 | #ifdef CC_HAVE_ASM_GOTO | ||
5 | |||
6 | #define __GEN_RMWcc(fullop, var, cc, ...) \ | ||
7 | do { \ | ||
8 | asm_volatile_goto (fullop "; j" cc " %l[cc_label]" \ | ||
9 | : : "m" (var), ## __VA_ARGS__ \ | ||
10 | : "memory" : cc_label); \ | ||
11 | return 0; \ | ||
12 | cc_label: \ | ||
13 | return 1; \ | ||
14 | } while (0) | ||
15 | |||
16 | #define GEN_UNARY_RMWcc(op, var, arg0, cc) \ | ||
17 | __GEN_RMWcc(op " " arg0, var, cc) | ||
18 | |||
19 | #define GEN_BINARY_RMWcc(op, var, val, arg0, cc) \ | ||
20 | __GEN_RMWcc(op " %1, " arg0, var, cc, "er" (val)) | ||
21 | |||
22 | #else /* !CC_HAVE_ASM_GOTO */ | ||
23 | |||
24 | #define __GEN_RMWcc(fullop, var, cc, ...) \ | ||
25 | do { \ | ||
26 | char c; \ | ||
27 | asm volatile (fullop "; set" cc " %1" \ | ||
28 | : "+m" (var), "=qm" (c) \ | ||
29 | : __VA_ARGS__ : "memory"); \ | ||
30 | return c != 0; \ | ||
31 | } while (0) | ||
32 | |||
33 | #define GEN_UNARY_RMWcc(op, var, arg0, cc) \ | ||
34 | __GEN_RMWcc(op " " arg0, var, cc) | ||
35 | |||
36 | #define GEN_BINARY_RMWcc(op, var, val, arg0, cc) \ | ||
37 | __GEN_RMWcc(op " %2, " arg0, var, cc, "er" (val)) | ||
38 | |||
39 | #endif /* CC_HAVE_ASM_GOTO */ | ||
40 | |||
41 | #endif /* _ASM_X86_RMWcc */ | ||