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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/um/os-Linux/elf_aux.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/os-Linux/elf_aux.c')
-rw-r--r-- | arch/um/os-Linux/elf_aux.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/um/os-Linux/elf_aux.c b/arch/um/os-Linux/elf_aux.c new file mode 100644 index 0000000000..344ac403fb --- /dev/null +++ b/arch/um/os-Linux/elf_aux.c @@ -0,0 +1,74 @@ +// 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; + } +} |