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[PATCH] Fix "Remove the use of _syscallX macros in UML"

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Fix commit 5f4c6bc1f369f20807a8e753c2308d1629478c61: 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>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2006-10-29 22:46:41 -08:00 committed by Linus Torvalds
parent bbb5bbb037
commit b428b51ed9
4 changed files with 18 additions and 8 deletions
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3
arch/um/os-Linux/sys-i386/tls.c
View File

@ -1,6 +1,9 @@
#include <errno.h>
#include <linux/unistd.h>
#include <sys/syscall.h>
#include <unistd.h>
#include "sysdep/tls.h"
#include "user_util.h"

1
arch/um/os-Linux/tls.c
View File

@ -1,6 +1,7 @@
#include <errno.h>
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <asm/ldt.h>
#include "sysdep/tls.h"
#include "uml-config.h"

11
arch/um/sys-i386/unmap.c
View File

@ -5,17 +5,20 @@
#include <linux/mman.h>
#include <asm/unistd.h>
#include <sys/syscall.h>
static int errno;
static inline _syscall2(int,munmap,void *,start,size_t,len)
static inline _syscall6(void *,mmap2,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 (syscall(__NR_munmap, to, size) < 0){
if(munmap(to, size) < 0){
return(-1);
}
if (syscall(__NR_mmap2, to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
return(-1);
}
if (syscall(__NR_munmap, from, size) < 0){
if(munmap(from, size) < 0){
return(-1);
}
return(0);

11
arch/um/sys-x86_64/unmap.c
View File

@ -5,17 +5,20 @@
#include <linux/mman.h>
#include <asm/unistd.h>
#include <sys/syscall.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 (syscall(__NR_munmap, to, size) < 0){
if(munmap(to, size) < 0){
return(-1);
}
if (syscall(__NR_mmap, to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
return(-1);
}
if (syscall(__NR_munmap, from, size) < 0){
if(munmap(from, size) < 0){
return(-1);
}
return(0);