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74 lines
2.0 KiB
74 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/um/kernel/elf_aux.c |
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* |
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* Scan the Elf auxiliary vector provided by the host to extract |
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* information about vsyscall-page, etc. |
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* |
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* Copyright (C) 2004 Fujitsu Siemens Computers GmbH |
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* Author: Bodo Stroesser ([email protected]) |
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*/ |
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#include <elf.h> |
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#include <stddef.h> |
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#include <init.h> |
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#include <elf_user.h> |
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#include <mem_user.h> |
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typedef Elf32_auxv_t elf_auxv_t; |
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/* These are initialized very early in boot and never changed */ |
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char * elf_aux_platform; |
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extern long elf_aux_hwcap; |
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unsigned long vsyscall_ehdr; |
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unsigned long vsyscall_end; |
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unsigned long __kernel_vsyscall; |
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__init void scan_elf_aux( char **envp) |
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{ |
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long page_size = 0; |
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elf_auxv_t * auxv; |
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while ( *envp++ != NULL) ; |
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for ( auxv = (elf_auxv_t *)envp; auxv->a_type != AT_NULL; auxv++) { |
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switch ( auxv->a_type ) { |
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case AT_SYSINFO: |
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__kernel_vsyscall = auxv->a_un.a_val; |
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/* See if the page is under TASK_SIZE */ |
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if (__kernel_vsyscall < (unsigned long) envp) |
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__kernel_vsyscall = 0; |
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break; |
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case AT_SYSINFO_EHDR: |
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vsyscall_ehdr = auxv->a_un.a_val; |
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/* See if the page is under TASK_SIZE */ |
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if (vsyscall_ehdr < (unsigned long) envp) |
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vsyscall_ehdr = 0; |
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break; |
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case AT_HWCAP: |
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elf_aux_hwcap = auxv->a_un.a_val; |
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break; |
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case AT_PLATFORM: |
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/* elf.h removed the pointer elements from |
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* a_un, so we have to use a_val, which is |
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* all that's left. |
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*/ |
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elf_aux_platform = |
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(char *) (long) auxv->a_un.a_val; |
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break; |
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case AT_PAGESZ: |
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page_size = auxv->a_un.a_val; |
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break; |
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} |
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} |
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if ( ! __kernel_vsyscall || ! vsyscall_ehdr || |
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! elf_aux_hwcap || ! elf_aux_platform || |
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! page_size || (vsyscall_ehdr % page_size) ) { |
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__kernel_vsyscall = 0; |
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vsyscall_ehdr = 0; |
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elf_aux_hwcap = 0; |
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elf_aux_platform = "i586"; |
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} |
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else { |
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vsyscall_end = vsyscall_ehdr + page_size; |
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} |
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}
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