MIPS: Use the new "ZC" constraint for MIPS R6
GCC versions supporting MIPS R6 use the ZC constraint to enforce a
9-bit offset for MIPS R6. We will use that for all MIPS R6 LL/SC
instructions.
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
diff --git a/arch/mips/include/asm/compiler.h b/arch/mips/include/asm/compiler.h
index 34ad65a..e081a26 100644
--- a/arch/mips/include/asm/compiler.h
+++ b/arch/mips/include/asm/compiler.h
@@ -16,13 +16,18 @@
#define GCC_REG_ACCUM "accum"
#endif
+#ifdef CONFIG_CPU_MIPSR6
+/* All MIPS R6 toolchains support the ZC constrain */
+#define GCC_OFF_SMALL_ASM() "ZC"
+#else
#ifndef CONFIG_CPU_MICROMIPS
#define GCC_OFF_SMALL_ASM() "R"
#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
#define GCC_OFF_SMALL_ASM() "ZC"
#else
#error "microMIPS compilation unsupported with GCC older than 4.9"
-#endif
+#endif /* CONFIG_CPU_MICROMIPS */
+#endif /* CONFIG_CPU_MIPSR6 */
#ifdef CONFIG_CPU_MIPSR6
#define MIPS_ISA_LEVEL "mips64r6"