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