mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
b428b51ed9
Fix commit 5f4c6bc1f3: it spits out warnings
about missing syscall prototype (it is in <unistd.h>) and it does not
recognize that two uses of _syscallX are to be resolved against kernel
headers in the source tree, not against _syscallX; they in fact do not
compile and would not work anyway.
If _syscallX macros will be removed from the kernel tree altogether, the
only reasonable solution for that piece of code is switching to open-coded
inline assembly (it's remapping the whole executable from memory, except
the page containing this code).
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
26 lines
572 B
C
26 lines
572 B
C
/*
|
|
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <linux/mman.h>
|
|
#include <asm/unistd.h>
|
|
|
|
static int errno;
|
|
|
|
static inline _syscall2(int,munmap,void *,start,size_t,len)
|
|
static inline _syscall6(void *,mmap,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
|
|
int switcheroo(int fd, int prot, void *from, void *to, int size)
|
|
{
|
|
if(munmap(to, size) < 0){
|
|
return(-1);
|
|
}
|
|
if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
|
|
return(-1);
|
|
}
|
|
if(munmap(from, size) < 0){
|
|
return(-1);
|
|
}
|
|
return(0);
|
|
}
|