1
2#include "qemu/osdep.h"
3#include "qemu/cutils.h"
4
5#include "qemu.h"
6
7
8
9
10
11abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len)
12{
13 abi_long ret = 0;
14 void *ghptr;
15
16 if ((ghptr = lock_user(VERIFY_READ, gaddr, len, 1))) {
17 memcpy(hptr, ghptr, len);
18 unlock_user(ghptr, gaddr, 0);
19 } else
20 ret = -TARGET_EFAULT;
21
22 return ret;
23}
24
25
26abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len)
27{
28 abi_long ret = 0;
29 void *ghptr;
30
31 if ((ghptr = lock_user(VERIFY_WRITE, gaddr, len, 0))) {
32 memcpy(ghptr, hptr, len);
33 unlock_user(ghptr, gaddr, len);
34 } else
35 ret = -TARGET_EFAULT;
36
37 return ret;
38}
39
40
41
42abi_long target_strlen(abi_ulong guest_addr1)
43{
44 uint8_t *ptr;
45 abi_ulong guest_addr;
46 int max_len, len;
47
48 guest_addr = guest_addr1;
49 for(;;) {
50 max_len = TARGET_PAGE_SIZE - (guest_addr & ~TARGET_PAGE_MASK);
51 ptr = lock_user(VERIFY_READ, guest_addr, max_len, 1);
52 if (!ptr)
53 return -TARGET_EFAULT;
54 len = qemu_strnlen((const char *)ptr, max_len);
55 unlock_user(ptr, guest_addr, 0);
56 guest_addr += len;
57
58 if (guest_addr == 0 ||
59 (guest_addr - guest_addr1) > 0x7fffffff)
60 return -TARGET_EFAULT;
61 if (len != max_len)
62 break;
63 }
64 return guest_addr - guest_addr1;
65}
66