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