// 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> typedef Elf32_auxv_t elf_auxv_t; /* These are initialized very early in boot and never changed */ char * elf_aux_platform; extern long elf_aux_hwcap; unsigned long vsyscall_ehdr; unsigned long vsyscall_end; unsigned long __kernel_vsyscall;
__init void scan_elf_aux( char **envp) { long page_size = 0; 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_SYSINFO: __kernel_vsyscall = auxv->a_un.a_val; /* See if the page is under TASK_SIZE */ if (__kernel_vsyscall < (unsigned long) envp) __kernel_vsyscall = 0; break; case AT_SYSINFO_EHDR: vsyscall_ehdr = auxv->a_un.a_val; /* See if the page is under TASK_SIZE */ if (vsyscall_ehdr < (unsigned long) envp) vsyscall_ehdr = 0; break; 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; case AT_PAGESZ: page_size = auxv->a_un.a_val; break; } } if ( ! __kernel_vsyscall || ! vsyscall_ehdr || ! elf_aux_hwcap || ! elf_aux_platform || ! page_size || (vsyscall_ehdr % page_size) ) { __kernel_vsyscall = 0; vsyscall_ehdr = 0; elf_aux_hwcap = 0; elf_aux_platform = "i586"; } else { vsyscall_end = vsyscall_ehdr + page_size; } }Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jeff Dike | 206 | 100.00% | 5 | 100.00% |
| Total | 206 | 100.00% | 5 | 100.00% |
| Person | Tokens | Prop | Commits | CommitProp |
| Jeff Dike | 241 | 97.18% | 8 | 66.67% |
| Al Viro | 3 | 1.21% | 1 | 8.33% |
| Olaf Hering | 2 | 0.81% | 1 | 8.33% |
| Greg Kroah-Hartman | 1 | 0.40% | 1 | 8.33% |
| Richard Weinberger | 1 | 0.40% | 1 | 8.33% |
| Total | 248 | 100.00% | 12 | 100.00% |