From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/um/os-Linux/elf_aux.c | 73 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 kernel/arch/um/os-Linux/elf_aux.c (limited to 'kernel/arch/um/os-Linux/elf_aux.c') diff --git a/kernel/arch/um/os-Linux/elf_aux.c b/kernel/arch/um/os-Linux/elf_aux.c new file mode 100644 index 000000000..1a365ddc4 --- /dev/null +++ b/kernel/arch/um/os-Linux/elf_aux.c @@ -0,0 +1,73 @@ +/* + * 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 +#include +#include +#include +#include + +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; + } +} -- cgit 1.2.3-korg