Thumb-2: Add macros for the unified assembler syntax
This patch adds various C and assembler macros that help with using
the unified assembler syntax for compiling files to either ARM or
Thumb-2 modes.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index aef63c8..da28e7b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -983,6 +983,9 @@
default AT91_TIMER_HZ if ARCH_AT91
default 100
+config ARM_ASM_UNIFIED
+ bool
+
config AEABI
bool "Use the ARM EABI to compile the kernel"
help
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index c877d6d..3505572 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -95,7 +95,7 @@
# Need -Uarm for gcc < 3.x
KBUILD_CFLAGS +=$(CFLAGS_ABI) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
-KBUILD_AFLAGS +=$(CFLAGS_ABI) $(arch-y) $(tune-y) -msoft-float
+KBUILD_AFLAGS +=$(CFLAGS_ABI) $(arch-y) $(tune-y) -include asm/unified.h -msoft-float
CHECKFLAGS += -D__arm__
diff --git a/arch/arm/include/asm/unified.h b/arch/arm/include/asm/unified.h
new file mode 100644
index 0000000..073e85b
--- /dev/null
+++ b/arch/arm/include/asm/unified.h
@@ -0,0 +1,126 @@
+/*
+ * include/asm-arm/unified.h - Unified Assembler Syntax helper macros
+ *
+ * Copyright (C) 2008 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __ASM_UNIFIED_H
+#define __ASM_UNIFIED_H
+
+#if defined(__ASSEMBLY__) && defined(CONFIG_ARM_ASM_UNIFIED)
+ .syntax unified
+#endif
+
+#ifdef CONFIG_THUMB2_KERNEL
+
+#if __GNUC__ < 4
+#error Thumb-2 kernel requires gcc >= 4
+#endif
+
+/* The CPSR bit describing the instruction set (Thumb) */
+#define PSR_ISETSTATE PSR_T_BIT
+
+#define ARM(x...)
+#define THUMB(x...) x
+#define W(instr) instr.w
+#define BSYM(sym) sym + 1
+
+#else /* !CONFIG_THUMB2_KERNEL */
+
+/* The CPSR bit describing the instruction set (ARM) */
+#define PSR_ISETSTATE 0
+
+#define ARM(x...) x
+#define THUMB(x...)
+#define W(instr) instr
+#define BSYM(sym) sym
+
+#endif /* CONFIG_THUMB2_KERNEL */
+
+#ifndef CONFIG_ARM_ASM_UNIFIED
+
+/*
+ * If the unified assembly syntax isn't used (in ARM mode), these
+ * macros expand to an empty string
+ */
+#ifdef __ASSEMBLY__
+ .macro it, cond
+ .endm
+ .macro itt, cond
+ .endm
+ .macro ite, cond
+ .endm
+ .macro ittt, cond
+ .endm
+ .macro itte, cond
+ .endm
+ .macro itet, cond
+ .endm
+ .macro itee, cond
+ .endm
+ .macro itttt, cond
+ .endm
+ .macro ittte, cond
+ .endm
+ .macro ittet, cond
+ .endm
+ .macro ittee, cond
+ .endm
+ .macro itett, cond
+ .endm
+ .macro itete, cond
+ .endm
+ .macro iteet, cond
+ .endm
+ .macro iteee, cond
+ .endm
+#else /* !__ASSEMBLY__ */
+__asm__(
+" .macro it, cond\n"
+" .endm\n"
+" .macro itt, cond\n"
+" .endm\n"
+" .macro ite, cond\n"
+" .endm\n"
+" .macro ittt, cond\n"
+" .endm\n"
+" .macro itte, cond\n"
+" .endm\n"
+" .macro itet, cond\n"
+" .endm\n"
+" .macro itee, cond\n"
+" .endm\n"
+" .macro itttt, cond\n"
+" .endm\n"
+" .macro ittte, cond\n"
+" .endm\n"
+" .macro ittet, cond\n"
+" .endm\n"
+" .macro ittee, cond\n"
+" .endm\n"
+" .macro itett, cond\n"
+" .endm\n"
+" .macro itete, cond\n"
+" .endm\n"
+" .macro iteet, cond\n"
+" .endm\n"
+" .macro iteee, cond\n"
+" .endm\n");
+#endif /* __ASSEMBLY__ */
+
+#endif /* CONFIG_ARM_ASM_UNIFIED */
+
+#endif /* !__ASM_UNIFIED_H */