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60b2737d PBG |
1 | /* |
2 | * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <linux/mman.h> | |
7 | #include <asm/unistd.h> | |
8 | ||
b428b51e PBG |
9 | static int errno; |
10 | ||
11 | static inline _syscall2(int,munmap,void *,start,size_t,len) | |
12 | static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset) | |
60b2737d PBG |
13 | int switcheroo(int fd, int prot, void *from, void *to, int size) |
14 | { | |
b428b51e | 15 | if(munmap(to, size) < 0){ |
60b2737d PBG |
16 | return(-1); |
17 | } | |
b428b51e | 18 | if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){ |
60b2737d PBG |
19 | return(-1); |
20 | } | |
b428b51e | 21 | if(munmap(from, size) < 0){ |
60b2737d PBG |
22 | return(-1); |
23 | } | |
24 | return(0); | |
25 | } |