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sys/conf/ldscript.set_pad
- This file was added.
| /*- | |||||
| * SPDX-License-Identifier: BSD-2-Clause | |||||
| * | |||||
| * Copyright (c) 2018 Bjoern A. Zeeb | |||||
| * | |||||
| * Redistribution and use in source and binary forms, with or without | |||||
| * modification, are permitted provided that the following conditions | |||||
| * are met: | |||||
| * 1. Redistributions of source code must retain the above copyright | |||||
| * notice, this list of conditions and the following disclaimer. | |||||
| * 2. Redistributions in binary form must reproduce the above copyright | |||||
| * notice, this list of conditions and the following disclaimer in the | |||||
| * documentation and/or other materials provided with the distribution. | |||||
| * | |||||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
| * SUCH DAMAGE. | |||||
| * | |||||
| * $FreeBSD$ | |||||
| */ | |||||
| /* | |||||
| * This linker script (1/2) is used to determine whether a kernel module | |||||
| * has a set_pcpu or a set_vnet section and record it in a new symbol. | |||||
| * Neither the SIZEOF() not the output/inut section will create the section | |||||
| * if it does not exist already. | |||||
| * The new symbol is reduced to either 1 (if the section exist) or | |||||
| * 0 (if the section does not exist). The value of the symbol will be | |||||
| * used in the (2/2) linker script to enlarge (pad at the end) an already | |||||
| * existing section by 1 byte. | |||||
| * This is needed as the code generated on certain architectures for | |||||
| * non-simple-types, e.g., an array can generate an absolute relocation | |||||
| * on the edge (just outside) the section and thus will not be properly | |||||
| * relocated. Adding the 1 byte pad to the end of the section will ensure | |||||
| * that even absolute relocations of complex types will be inside the | |||||
| * section, if they are the last object in there and hence relocation will | |||||
| * work properly and avoid panics. | |||||
| */ | |||||
| ___set_pcpu_pad = ABSOLUTE ( SIZEOF(set_pcpu) ? 1 : 0 ) ; | |||||
| SECTIONS | |||||
| { | |||||
| set_pcpu : { *(set_pcpu) } | |||||
| } | |||||
| ___set_vnet_pad = ABSOLUTE ( SIZEOF(set_vnet) ? 1 : 0 ) ; | |||||
| SECTIONS | |||||
| { | |||||
| set_vnet : { *(set_vnet) } | |||||
| } | |||||
| /* end */ | |||||