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// SPDX-License-Identifier: GPL-2.0
/*
* arch/um/kernel/elf_aux.c
*
* Scan the ELF auxiliary vector provided by the host to extract
* information about vsyscall-page, etc.
*
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
* Author: Bodo Stroesser (bodo.stroesser@fujitsu-siemens.com)
*/
#include <elf.h>
#include <stddef.h>
#include <init.h>
#include <elf_user.h>
#include <mem_user.h>
#include "internal.h"
#include <linux/swab.h>
#if __BITS_PER_LONG == 64
typedef Elf64_auxv_t elf_auxv_t;
#else
typedef Elf32_auxv_t elf_auxv_t;
#endif
/* These are initialized very early in boot and never changed */
char * elf_aux_platform;
long elf_aux_hwcap;
__init void scan_elf_aux( char **envp)
{
elf_auxv_t * auxv;
while ( *envp++ != NULL) ;
for ( auxv = (elf_auxv_t *)envp; auxv->a_type != AT_NULL; auxv++) {
switch ( auxv->a_type ) {
case AT_HWCAP:
elf_aux_hwcap = auxv->a_un.a_val;
break;
case AT_PLATFORM:
/* elf.h removed the pointer elements from
* a_un, so we have to use a_val, which is
* all that's left.
*/
elf_aux_platform =
(char *) (long) auxv->a_un.a_val;
break;
}
}
}
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