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47bd65ef05
This change is only done where needed: some linker scripts may contain relocation symbols yet remain unchanged. __rel_dyn_start and __rel_dyn_end each requires its own output section; putting them in relocation sections changes their flags and breaks relocation. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net> Tested-by: Lubomir Popov <lpopov@mm-sol.com> Tested-by: Jeroen Hofstee <jeroen@myspectrum.nl> Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
43 lines
1.9 KiB
C
43 lines
1.9 KiB
C
/*
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* Copyright 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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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 __bss_start[0] __attribute__((section(".__bss_start")));
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char __bss_end[0] __attribute__((section(".__bss_end")));
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char __image_copy_start[0] __attribute__((section(".__image_copy_start")));
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char __image_copy_end[0] __attribute__((section(".__image_copy_end")));
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char __rel_dyn_start[0] __attribute__((section(".__rel_dyn_start")));
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char __rel_dyn_end[0] __attribute__((section(".__rel_dyn_end")));
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