[U-Boot] [PATCH 1/5] arm: include: Import unified.h from Linux kernel

Marek Vasut
2016-03-20T16:15:30Z

Import unified.h from Linux kernel 4.4.6 , commit
0d1912303e54ed1b2a371be0bba51c384dd57326 . This header file contains
macros used in libgcc functions in Linux kernel on ARM and will be
needed for the libgcc sync.

Since unified.h defines the W(instr) macro, we must drop this from
the macro from memcpy.S , otherwise this triggers a warning about
symbol redefinition. In order to keep the changes to unified.h to
the minimum, tweak arch/arm/lib/Makefile such that it defines new
CONFIG_THUMB2_KERNEL macro, which is already checked by unified.h,
only if Thumb build is enabled, but the target does not support
Thumb2 . This way we can remove ad-hoc -DMEMSET_NO_THUMB_BUILD and
-DMEMCPY_NO_THUMB_BUILD and we do not change the logic.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
---
arch/arm/include/asm/assembler.h | 1 +
arch/arm/include/asm/unified.h | 140 +++++++++++++++++++++++++++++++++++++++
arch/arm/lib/Makefile | 6 +-
arch/arm/lib/memcpy.S | 6 --
4 files changed, 144 insertions(+), 9 deletions(-)
create mode 100644 arch/arm/include/asm/unified.h

diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 11b80fb..ae1e42f 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -15,6 +15,7 @@
*/

#include <config.h>
+#include <asm/unified.h>

/*
* Endian independent macros for shifting bytes within registers.
diff --git a/arch/arm/include/asm/unified.h b/arch/arm/include/asm/unified.h
new file mode 100644
index 0000000..a91ae49
--- /dev/null
+++ b/arch/arm/include/asm/unified.h
@@ -0,0 +1,140 @@
+/*
+ * 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_CPU_V7M
+#define AR_CLASS(x...)
+#define M_CLASS(x...) x
+#else
+#define AR_CLASS(x...) x
+#define M_CLASS(x...)
+#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
+#ifdef __ASSEMBLY__
+#define W(instr) instr.w
+#else
+#define WASM(instr) #instr ".w"
+#endif
+
+#else /* !CONFIG_THUMB2_KERNEL */
+
+/* The CPSR bit describing the instruction set (ARM) */
+#define PSR_ISETSTATE 0
+
+#define ARM(x...) x
+#define THUMB(x...)
+#ifdef __ASSEMBLY__
+#define W(instr) instr
+#else
+#define WASM(instr) #instr
+#endif
+
+#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 */
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 7a0fb58..a930744 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -80,8 +80,8 @@ CFLAGS_cache-cp15.o := -marm

AFLAGS_REMOVE_memset.o := -mthumb -mthumb-interwork
AFLAGS_REMOVE_memcpy.o := -mthumb -mthumb-interwork
-AFLAGS_memset.o := -DMEMSET_NO_THUMB_BUILD
-AFLAGS_memcpy.o := -DMEMCPY_NO_THUMB_BUILD
-
+else
+AFLAGS_memset.o := -DCONFIG_THUMB2_KERNEL
+AFLAGS_memcpy.o := -DCONFIG_THUMB2_KERNEL
endif
endif
diff --git a/arch/arm/lib/memcpy.S b/arch/arm/lib/memcpy.S
index 7d9fc0f..00602e9 100644
--- a/arch/arm/lib/memcpy.S
+++ b/arch/arm/lib/memcpy.S
@@ -13,12 +13,6 @@
#include <linux/linkage.h>
#include <asm/assembler.h>

-#if defined(CONFIG_SYS_THUMB_BUILD) && !defined(MEMCPY_NO_THUMB_BUILD)
-#define W(instr) instr.w
-#else
-#define W(instr) instr
-#endif
-
#define LDR1W_SHIFT 0
#define STR1W_SHIFT 0

--
2.7.0