nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / arch / um / os-Linux / elf_aux.c
blob953323799381574477272bf4b14d230672ffe1e3
1 /*
2 * arch/um/kernel/elf_aux.c
4 * Scan the Elf auxiliary vector provided by the host to extract
5 * information about vsyscall-page, etc.
7 * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
8 * Author: Bodo Stroesser (bodo.stroesser@fujitsu-siemens.com)
9 */
10 #include <elf.h>
11 #include <stddef.h>
12 #include "init.h"
13 #include "elf_user.h"
14 #include "mem_user.h"
15 #include <kern_constants.h>
17 typedef Elf32_auxv_t elf_auxv_t;
19 /* These are initialized very early in boot and never changed */
20 char * elf_aux_platform;
21 extern long elf_aux_hwcap;
22 unsigned long vsyscall_ehdr;
23 unsigned long vsyscall_end;
24 unsigned long __kernel_vsyscall;
26 __init void scan_elf_aux( char **envp)
28 long page_size = 0;
29 elf_auxv_t * auxv;
31 while ( *envp++ != NULL) ;
33 for ( auxv = (elf_auxv_t *)envp; auxv->a_type != AT_NULL; auxv++) {
34 switch ( auxv->a_type ) {
35 case AT_SYSINFO:
36 __kernel_vsyscall = auxv->a_un.a_val;
37 /* See if the page is under TASK_SIZE */
38 if (__kernel_vsyscall < (unsigned long) envp)
39 __kernel_vsyscall = 0;
40 break;
41 case AT_SYSINFO_EHDR:
42 vsyscall_ehdr = auxv->a_un.a_val;
43 /* See if the page is under TASK_SIZE */
44 if (vsyscall_ehdr < (unsigned long) envp)
45 vsyscall_ehdr = 0;
46 break;
47 case AT_HWCAP:
48 elf_aux_hwcap = auxv->a_un.a_val;
49 break;
50 case AT_PLATFORM:
51 /* elf.h removed the pointer elements from
52 * a_un, so we have to use a_val, which is
53 * all that's left.
55 elf_aux_platform =
56 (char *) (long) auxv->a_un.a_val;
57 break;
58 case AT_PAGESZ:
59 page_size = auxv->a_un.a_val;
60 break;
63 if ( ! __kernel_vsyscall || ! vsyscall_ehdr ||
64 ! elf_aux_hwcap || ! elf_aux_platform ||
65 ! page_size || (vsyscall_ehdr % page_size) ) {
66 __kernel_vsyscall = 0;
67 vsyscall_ehdr = 0;
68 elf_aux_hwcap = 0;
69 elf_aux_platform = "i586";
71 else {
72 vsyscall_end = vsyscall_ehdr + page_size;