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742752afc0
commit 47bd65ef05 ("arm: make __rel_dyn_{start, end} compiler-generated")
were moving the __rel_dyn_start/end on c generated variables that were
injected in their own sections. The reason was that we needed relative
relocations for position independent code and linker bugs back then
prevented us from doing so [0].
However, the linker documentation pages states that symbols that are
defined within a section definition will create a relocatable
type with the value being a fixed offset from the base of a section [1].
[0] binutils commit 6b3b0ab89663 ("Make linker assigned symbol dynamic only for shared object")
[1] https://sourceware.org/binutils/docs/ld/Expression-Section.html
Suggested-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Sam Edwards <CFSworks@gmail.com> # Binary output identical
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
31 lines
1.3 KiB
C
31 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
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*/
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#include <linux/compiler.h>
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/**
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* These two symbols are declared in a C file so that the linker
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* uses R_ARM_RELATIVE relocation, rather than the R_ARM_ABS32 one
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* it would use if the symbols were defined in the linker file.
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* Using only R_ARM_RELATIVE relocation ensures that references to
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* the symbols are correct after as well as before relocation.
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*
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* We need a 0-byte-size type for these symbols, and the compiler
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* does not allow defining objects of C type 'void'. Using an empty
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* struct is allowed by the compiler, but causes gcc versions 4.4 and
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* below to complain about aliasing. Therefore we use the next best
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* thing: zero-sized arrays, which are both 0-byte-size and exempt from
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* aliasing warnings.
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*/
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char __image_copy_start[0] __section(".__image_copy_start");
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char __image_copy_end[0] __section(".__image_copy_end");
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char __secure_start[0] __section(".__secure_start");
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char __secure_end[0] __section(".__secure_end");
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char __secure_stack_start[0] __section(".__secure_stack_start");
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char __secure_stack_end[0] __section(".__secure_stack_end");
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char __efi_runtime_start[0] __section(".__efi_runtime_start");
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char __efi_runtime_stop[0] __section(".__efi_runtime_stop");
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char _end[0] __section(".__end");
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