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1 | /* |
2 | * Copyright 2013 Albert ARIBAUD <albert.u.boot@aribaud.net> | |
3 | * | |
4 | * See file CREDITS for list of people who contributed to this | |
5 | * project. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | /** | |
24 | * These two symbols are declared in a C file so that the linker | |
25 | * uses R_ARM_RELATIVE relocation, rather than the R_ARM_ABS32 one | |
26 | * it would use if the symbols were defined in the linker file. | |
27 | * Using only R_ARM_RELATIVE relocation ensures that references to | |
28 | * the symbols are correct after as well as before relocation. | |
29 | * | |
30 | * We need a 0-byte-size type for these symbols, and the compiler | |
31 | * does not allow defining objects of C type 'void'. Using an empty | |
32 | * struct is allowed by the compiler, but causes gcc versions 4.4 and | |
33 | * below to complain about aliasing. Therefore we use the next best | |
34 | * thing: zero-sized arrays, which are both 0-byte-size and exempt from | |
35 | * aliasing warnings. | |
36 | */ | |
37 | ||
38 | char __bss_start[0] __attribute__((used, section(".__bss_start"))); | |
0ce033d2 | 39 | char __bss_end[0] __attribute__((used, section(".__bss_end"))); |