MN10300: Specify an ELF HWCAP flag for MN10300 Atomic Operations Unit support
Use an ELF HWCAP flag to indicate to the process that the CPU provides LL/SC
equivalent atomic operations unit support in addition to BSET/BCLR.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/arch/mn10300/include/asm/elf.h b/arch/mn10300/include/asm/elf.h
index a30d220..8157c92 100644
--- a/arch/mn10300/include/asm/elf.h
+++ b/arch/mn10300/include/asm/elf.h
@@ -32,6 +32,12 @@
#define R_MN10300_ALIGN 34 /* Alignment requirement. */
/*
+ * AM33/AM34 HW Capabilities
+ */
+#define HWCAP_MN10300_ATOMIC_OP_UNIT 1 /* Has AM34 Atomic Operations */
+
+
+/*
* ELF register definitions..
*/
typedef unsigned long elf_greg_t;
@@ -128,7 +134,11 @@
* instruction set this CPU supports. This could be done in user space,
* but it's not easy, and we've already done it here.
*/
+#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
+#define ELF_HWCAP (HWCAP_MN10300_ATOMIC_OP_UNIT)
+#else
#define ELF_HWCAP (0)
+#endif
/*
* This yields a string that ld.so will use to load implementation