X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=include%2Fust%2Fprocessor.h;h=6ee44ddde599f3bd8eb5e24d90295c800168e1be;hb=7f0357f05bf1dae6e371b04a6f94d6912f0a0303;hp=867b140cce9b2d408f594f770ac688da86f5702c;hpb=6fa0d97f663351869797d35ddb504489e223fa7c;p=ust.git

diff --git a/include/ust/processor.h b/include/ust/processor.h
index 867b140..6ee44dd 100644
--- a/include/ust/processor.h
+++ b/include/ust/processor.h
@@ -20,10 +20,13 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <urcu-bp.h>
 
 extern __thread long ust_reg_stack[500];
 extern volatile __thread long *ust_reg_stack_ptr;
 
+#define ____cacheline_aligned __attribute__((aligned(CAA_CACHE_LINE_SIZE)))
+
 #ifdef __i386
 
 struct registers {
@@ -211,9 +214,7 @@ static inline int fls(int x)
 
 #define _ASM_PTR ".long "
 
-#endif /* below is code for x86-64 */
-
-#ifdef __x86_64
+#elif defined(__x86_64)
 
 struct registers {
 	int padding; /* 4 bytes */
@@ -290,7 +291,7 @@ static inline int fls(int x)
 	     /* Start TLS access of private reg stack pointer */ \
 	     ".byte 0x66\n\t" \
 	     "leaq ust_reg_stack_ptr@tlsgd(%%rip), %%rdi\n\t" \
-	     ".word 0x6666\n\t" \
+	     ".hword 0x6666\n\t" \
 	     "rex64\n\t" \
 	     "call __tls_get_addr@plt\n\t" \
 	     /* --- End TLS access */ \
@@ -302,7 +303,7 @@ static inline int fls(int x)
 	     /* Start TLS access of private reg stack */ \
 	     ".byte 0x66\n\t" \
 	     "leaq ust_reg_stack@tlsgd(%%rip), %%rdi\n\t" \
-	     ".word 0x6666\n\t" \
+	     ".hword 0x6666\n\t" \
 	     "rex64\n\t" \
 	     "call __tls_get_addr@plt\n\t" \
 	     /* --- End TLS access */ \
@@ -422,9 +423,7 @@ static inline int fls(int x)
 
 #define _ASM_PTR ".quad "
 
-#endif /* x86_64 */
-
-#ifdef __PPC__
+#elif defined(__PPC__)
 
 struct registers {
 };
@@ -444,6 +443,37 @@ static __inline__ int fls(unsigned int x)
 #define _ASM_PTR ".long "
 #define save_registers(a)
 
-#endif /* __PPC__ */
+#else /* arch-agnostic */
+
+static __inline__ int fls(unsigned int x)
+{
+	int r = 32;
+
+	if (!x)
+		return 0;
+	if (!(x & 0xFFFF0000U)) {
+		x <<= 16;
+		r -= 16;
+	}
+	if (!(x & 0xFF000000U)) {
+		x <<= 8;
+		r -= 8;
+	}
+	if (!(x & 0xF0000000U)) {
+		x <<= 4;
+		r -= 4;
+	}
+	if (!(x & 0xC0000000U)) {
+		x <<= 2;
+		r -= 2;
+	}
+	if (!(x & 0x80000000U)) {
+		x <<= 1;
+		r -= 1;
+	}
+	return r;
+}
+
+#endif
 
 #endif /* UST_PROCESSOR_H */