b6a3e690b4
Abstract away dependence on a system implementation of getauxval. Signed-off-by: Richard Henderson <rth@twiddle.net>
75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*
|
|
* QEMU access to the auxiliary vector
|
|
*
|
|
* Copyright (C) 2013 Red Hat, Inc
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu/osdep.h"
|
|
|
|
#ifdef CONFIG_GETAUXVAL
|
|
/* Don't inline this in qemu/osdep.h, because pulling in <sys/auxv.h> for
|
|
the system declaration of getauxval pulls in the system <elf.h>, which
|
|
conflicts with qemu's version. */
|
|
|
|
#include <sys/auxv.h>
|
|
|
|
unsigned long qemu_getauxval(unsigned long key)
|
|
{
|
|
return getauxval(key);
|
|
}
|
|
#elif defined(__linux__)
|
|
#include "elf.h"
|
|
|
|
/* Our elf.h doesn't contain Elf32_auxv_t and Elf64_auxv_t, which is ok because
|
|
that just makes it easier to define it properly for the host here. */
|
|
typedef struct {
|
|
unsigned long a_type;
|
|
unsigned long a_val;
|
|
} ElfW_auxv_t;
|
|
|
|
static const ElfW_auxv_t *auxv;
|
|
|
|
void qemu_init_auxval(char **envp)
|
|
{
|
|
/* The auxiliary vector is located just beyond the initial environment. */
|
|
while (*envp++ != NULL) {
|
|
continue;
|
|
}
|
|
auxv = (const ElfW_auxv_t *)envp;
|
|
}
|
|
|
|
unsigned long qemu_getauxval(unsigned long type)
|
|
{
|
|
/* If we were able to find the auxiliary vector, use it. */
|
|
if (auxv) {
|
|
const ElfW_auxv_t *a;
|
|
for (a = auxv; a->a_type != 0; a++) {
|
|
if (a->a_type == type) {
|
|
return a->a_val;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|