tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <stdio.h>
7#include <stdlib.h>
8#include <unistd.h>
9#include <limits.h>
10#include <sys/mman.h>
11#include <sys/stat.h>
12#include <sys/utsname.h>
13#include <sys/param.h>
14#include <sys/time.h>
15#include "asm/types.h"
16#include <ctype.h>
17#include <signal.h>
18#include <wait.h>
19#include <errno.h>
20#include <stdarg.h>
21#include <sched.h>
22#include <termios.h>
23#include <string.h>
24#include "user_util.h"
25#include "kern_util.h"
26#include "user.h"
27#include "mem_user.h"
28#include "init.h"
29#include "ptrace_user.h"
30#include "uml-config.h"
31#include "os.h"
32#include "longjmp.h"
33
34void stack_protections(unsigned long address)
35{
36 int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
37
38 if(mprotect((void *) address, page_size(), prot) < 0)
39 panic("protecting stack failed, errno = %d", errno);
40}
41
42void task_protections(unsigned long address)
43{
44 unsigned long guard = address + page_size();
45 unsigned long stack = guard + page_size();
46 int prot = 0, pages;
47
48#ifdef notdef
49 if(mprotect((void *) stack, page_size(), prot) < 0)
50 panic("protecting guard page failed, errno = %d", errno);
51#endif
52 pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
53 prot = PROT_READ | PROT_WRITE | PROT_EXEC;
54 if(mprotect((void *) stack, pages * page_size(), prot) < 0)
55 panic("protecting stack failed, errno = %d", errno);
56}
57
58int raw(int fd)
59{
60 struct termios tt;
61 int err;
62
63 CATCH_EINTR(err = tcgetattr(fd, &tt));
64 if(err < 0)
65 return -errno;
66
67 cfmakeraw(&tt);
68
69 CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
70 if(err < 0)
71 return -errno;
72
73 /* XXX tcsetattr could have applied only some changes
74 * (and cfmakeraw() is a set of changes) */
75 return(0);
76}
77
78void setup_machinename(char *machine_out)
79{
80 struct utsname host;
81
82 uname(&host);
83#ifdef UML_CONFIG_UML_X86
84# ifndef UML_CONFIG_64BIT
85 if (!strcmp(host.machine, "x86_64")) {
86 strcpy(machine_out, "i686");
87 return;
88 }
89# else
90 if (!strcmp(host.machine, "i686")) {
91 strcpy(machine_out, "x86_64");
92 return;
93 }
94# endif
95#endif
96 strcpy(machine_out, host.machine);
97}
98
99char host_info[(_UTSNAME_LENGTH + 1) * 4 + _UTSNAME_NODENAME_LENGTH + 1];
100
101void setup_hostinfo(void)
102{
103 struct utsname host;
104
105 uname(&host);
106 sprintf(host_info, "%s %s %s %s %s", host.sysname, host.nodename,
107 host.release, host.version, host.machine);
108}
109
110int setjmp_wrapper(void (*proc)(void *, void *), ...)
111{
112 va_list args;
113 jmp_buf buf;
114 int n;
115
116 n = UML_SETJMP(&buf);
117 if(n == 0){
118 va_start(args, proc);
119 (*proc)(&buf, &args);
120 }
121 va_end(args);
122 return n;
123}