From df84502edffd1da48588a212b402602f032ed53d Mon Sep 17 00:00:00 2001 From: Albert ARIBAUD Date: Tue, 11 Jun 2013 14:17:32 +0200 Subject: arm: generalize lib/bss.c into lib/sections.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit File arch/arm/lib/bss.c was initially defined for BSS only, but is now going to also contain definitions for other section-boundary-related symbols, so rename it for better accuracy. Also, remove useless 'used' attributes. Signed-off-by: Albert ARIBAUD Tested-by: Lubomir Popov Tested-by: Jeroen Hofstee Reviewed-by: Benoît Thébaudeau --- arch/arm/lib/sections.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 arch/arm/lib/sections.c (limited to 'arch/arm/lib/sections.c') diff --git a/arch/arm/lib/sections.c b/arch/arm/lib/sections.c new file mode 100644 index 00000000000..e52fec93331 --- /dev/null +++ b/arch/arm/lib/sections.c @@ -0,0 +1,39 @@ +/* + * Copyright 2013 Albert ARIBAUD + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * 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 + */ + +/** + * These two symbols are declared in a C file so that the linker + * uses R_ARM_RELATIVE relocation, rather than the R_ARM_ABS32 one + * it would use if the symbols were defined in the linker file. + * Using only R_ARM_RELATIVE relocation ensures that references to + * the symbols are correct after as well as before relocation. + * + * We need a 0-byte-size type for these symbols, and the compiler + * does not allow defining objects of C type 'void'. Using an empty + * struct is allowed by the compiler, but causes gcc versions 4.4 and + * below to complain about aliasing. Therefore we use the next best + * thing: zero-sized arrays, which are both 0-byte-size and exempt from + * aliasing warnings. + */ + +char __bss_start[0] __attribute__((section(".__bss_start"))); +char __bss_end[0] __attribute__((section(".__bss_end"))); -- cgit v1.2.3