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https://github.com/smaeul/u-boot.git
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2b17dd1d9d
Rename current assembler implementation of allow_unaligned() to
arm11_arch_cp15_allow_unaligned() and add it into arm11.h header,
then add C wrapper of allow_unaligned().
This fixes misbehavior when linking U-Boot, where the CPU specific
allow_unaligned() implementation was ignored and instead the
__weak allow_unaligned() implementation from lib/efi_loader/efi_setup.c
was used, which led to "data abort" just before booting Linux via tftp,
in efi_dp_from_file() -> path_to_uefi() -> utf16_put() .
The problem is triggerd by c7c0ca37673 ("efi_loader: fix efi_dp_from_file()") .
Adding the wrapper fixes the problem.
Fixes: d47a774680d ("arm: arm11: allow unaligned memory access")
Signed-off-by: Marek Vasut <marex@denx.de>
26 lines
892 B
ArmAsm
26 lines
892 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Routines to access the system control register
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*
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* Copyright (c) 2019 Heinrich Schuchardt
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*/
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#include <linux/linkage.h>
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/*
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* void arm11_arch_cp15_allow_unaligned(void) - allow unaligned access
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*
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* This routine sets the enable unaligned data support flag and clears the
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* aligned flag in the system control register.
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* After calling this routine unaligned access does no longer leads to a
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* data abort or undefined behavior but is handled by the CPU.
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* For details see the "ARM Architecture Reference Manual" for ARMv6.
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*/
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ENTRY(arm11_arch_cp15_allow_unaligned)
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mrc p15, 0, r0, c1, c0, 0 @ load system control register
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orr r0, r0, #1 << 22 @ set unaligned data support flag
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bic r0, r0, #2 @ clear aligned flag
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mcr p15, 0, r0, c1, c0, 0 @ write system control register
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bx lr @ return
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ENDPROC(arm11_arch_cp15_allow_unaligned)
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