mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-13 06:42:56 +00:00
583f1b2f10
There is currently a problem that U-Boot can not work on ARMv4
because assembly imlementations of memcpy() and some other functions
use "bx lr" instruction that is not available on ARMv4 ("mov pc, lr"
should be used instead).
A working preprocessor-based solution to this problem is found in
arch/arm/lib/relocate.S. Move it to the "ret" macro in
arch/arm/include/asm/assembler.h and change all "bx lr" code
to "ret lr" in functions that may run on ARMv4. Linux source code
deals with this problem in the same manner.
v1 -> v2:
Comment update. Pointed out by Andre Przywara.
Signed-off-by: Sergei Antonov <saproj@gmail.com>
CC: Samuel Holland <samuel@sholland.org>
CC: Ye Li <ye.li@nxp.com>
CC: Simon Glass <sjg@chromium.org>
CC: Andre Przywara <andre.przywara@arm.com>
CC: Marek Vasut <marex@denx.de>
CC: Sean Anderson <sean.anderson@seco.com>
CC: Tom Rini <trini@konsulko.com>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* arch/arm/include/asm/assembler.h
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*
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* Copyright (C) 1996-2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file contains arm architecture specific defines
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* for the different processors.
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*
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* Do not include any C declarations in this file - it is included by
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* assembler source.
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*/
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#include <config.h>
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#include <asm/unified.h>
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/*
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* Endian independent macros for shifting bytes within registers.
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*/
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#ifndef __ARMEB__
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#define lspull lsr
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#define lspush lsl
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#define get_byte_0 lsl #0
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#define get_byte_1 lsr #8
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#define get_byte_2 lsr #16
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#define get_byte_3 lsr #24
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#define put_byte_0 lsl #0
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#define put_byte_1 lsl #8
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#define put_byte_2 lsl #16
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#define put_byte_3 lsl #24
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#else
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#define lspull lsl
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#define lspush lsr
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#define get_byte_0 lsr #24
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#define get_byte_1 lsr #16
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#define get_byte_2 lsr #8
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#define get_byte_3 lsl #0
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#define put_byte_0 lsl #24
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#define put_byte_1 lsl #16
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#define put_byte_2 lsl #8
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#define put_byte_3 lsl #0
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#endif
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/*
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* Data preload for architectures that support it
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*/
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#if defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) || \
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defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) || \
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defined(__ARM_ARCH_6T2__) || defined(__ARM_ARCH_6Z__) || \
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defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_7A__) || \
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defined(__ARM_ARCH_7R__)
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#define PLD(code...) code
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#else
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#define PLD(code...)
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#endif
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/*
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* Use 'bx lr' everywhere except ARMv4 (without 'T') where only 'mov pc, lr'
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* works
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*/
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.irp c,,eq,ne,cs,cc,mi,pl,vs,vc,hi,ls,ge,lt,gt,le,hs,lo
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.macro ret\c, reg
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/* ARMv4- don't know bx lr but the assembler fails to see that */
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#ifdef __ARM_ARCH_4__
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mov\c pc, \reg
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#else
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.ifeqs "\reg", "lr"
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bx\c \reg
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.else
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mov\c pc, \reg
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.endif
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#endif
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.endm
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.endr
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/*
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* Cache aligned, used for optimized memcpy/memset
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* In the kernel this is only enabled for Feroceon CPU's...
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* We disable it especially for Thumb builds since those instructions
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* are not made in a Thumb ready way...
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*/
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#if CONFIG_IS_ENABLED(SYS_THUMB_BUILD)
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#define CALGN(code...)
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#else
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#define CALGN(code...) code
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#endif
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