aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um/kernel/tt/uaccess_user.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/um/kernel/tt/uaccess_user.c')
-rw-r--r--arch/um/kernel/tt/uaccess_user.c105
1 files changed, 0 insertions, 105 deletions
diff --git a/arch/um/kernel/tt/uaccess_user.c b/arch/um/kernel/tt/uaccess_user.c
deleted file mode 100644
index 0e5c82c5e5b7..000000000000
--- a/arch/um/kernel/tt/uaccess_user.c
+++ /dev/null
@@ -1,105 +0,0 @@
1/*
2 * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
3 * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
4 * Licensed under the GPL
5 */
6
7#include <string.h>
8#include "uml_uaccess.h"
9#include "task.h"
10#include "kern_util.h"
11#include "os.h"
12#include "longjmp.h"
13
14int __do_copy_from_user(void *to, const void *from, int n,
15 void **fault_addr, void **fault_catcher)
16{
17 struct tt_regs save = TASK_REGS(get_current())->tt;
18 unsigned long fault;
19 int faulted;
20
21 fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
22 __do_copy, &faulted);
23 TASK_REGS(get_current())->tt = save;
24
25 if(!faulted)
26 return 0;
27 else if (fault)
28 return n - (fault - (unsigned long) from);
29 else
30 /* In case of a general protection fault, we don't have the
31 * fault address, so NULL is used instead. Pretend we didn't
32 * copy anything. */
33 return n;
34}
35
36static void __do_strncpy(void *dst, const void *src, int count)
37{
38 strncpy(dst, src, count);
39}
40
41int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
42 void **fault_addr, void **fault_catcher)
43{
44 struct tt_regs save = TASK_REGS(get_current())->tt;
45 unsigned long fault;
46 int faulted;
47
48 fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
49 __do_strncpy, &faulted);
50 TASK_REGS(get_current())->tt = save;
51
52 if(!faulted) return(strlen(dst));
53 else return(-1);
54}
55
56static void __do_clear(void *to, const void *from, int n)
57{
58 memset(to, 0, n);
59}
60
61int __do_clear_user(void *mem, unsigned long len,
62 void **fault_addr, void **fault_catcher)
63{
64 struct tt_regs save = TASK_REGS(get_current())->tt;
65 unsigned long fault;
66 int faulted;
67
68 fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
69 __do_clear, &faulted);
70 TASK_REGS(get_current())->tt = save;
71
72 if(!faulted) return(0);
73 else return(len - (fault - (unsigned long) mem));
74}
75
76int __do_strnlen_user(const char *str, unsigned long n,
77 void **fault_addr, void **fault_catcher)
78{
79 struct tt_regs save = TASK_REGS(get_current())->tt;
80 int ret;
81 unsigned long *faddrp = (unsigned long *)fault_addr;
82 jmp_buf jbuf;
83
84 *fault_catcher = &jbuf;
85 if(UML_SETJMP(&jbuf) == 0)
86 ret = strlen(str) + 1;
87 else ret = *faddrp - (unsigned long) str;
88
89 *fault_addr = NULL;
90 *fault_catcher = NULL;
91
92 TASK_REGS(get_current())->tt = save;
93 return ret;
94}
95
96/*
97 * Overrides for Emacs so that we follow Linus's tabbing style.
98 * Emacs will notice this stuff at the end of the file and automatically
99 * adjust the settings for this buffer only. This must remain at the end
100 * of the file.
101 * ---------------------------------------------------------------------------
102 * Local variables:
103 * c-file-style: "linux"
104 * End:
105 */