tools include: Add basic atomic.h implementation from the kernel sources

[firefly-linux-kernel-4.4.55.git] / tools / arch / x86 / include / asm / rmwcc.h

diff --git a/tools/arch/x86/include/asm/rmwcc.h b/tools/arch/x86/include/asm/rmwcc.h
new file mode 100644 (file)
index 0000000..a6669bc
--- /dev/null
+++ b/tools/arch/x86/include/asm/rmwcc.h
@@ -0,0 +1,41 @@
+#ifndef _TOOLS_LINUX_ASM_X86_RMWcc
+#define _TOOLS_LINUX_ASM_X86_RMWcc
+
+#ifdef CC_HAVE_ASM_GOTO
+
+#define __GEN_RMWcc(fullop, var, cc, ...)                              \
+do {                                                                   \
+       asm_volatile_goto (fullop "; j" cc " %l[cc_label]"              \
+                       : : "m" (var), ## __VA_ARGS__                   \
+                       : "memory" : cc_label);                         \
+       return 0;                                                       \
+cc_label:                                                              \
+       return 1;                                                       \
+} while (0)
+
+#define GEN_UNARY_RMWcc(op, var, arg0, cc)                             \
+       __GEN_RMWcc(op " " arg0, var, cc)
+
+#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                 \
+       __GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))
+
+#else /* !CC_HAVE_ASM_GOTO */
+
+#define __GEN_RMWcc(fullop, var, cc, ...)                              \
+do {                                                                   \
+       char c;                                                         \
+       asm volatile (fullop "; set" cc " %1"                           \
+                       : "+m" (var), "=qm" (c)                         \
+                       : __VA_ARGS__ : "memory");                      \
+       return c != 0;                                                  \
+} while (0)
+
+#define GEN_UNARY_RMWcc(op, var, arg0, cc)                             \
+       __GEN_RMWcc(op " " arg0, var, cc)
+
+#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc)                 \
+       __GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))
+
+#endif /* CC_HAVE_ASM_GOTO */
+
+#endif /* _TOOLS_LINUX_ASM_X86_RMWcc */