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Message-Id: <20061029183405.31657.44335.stgit@americanbeauty.home.lan>
Date: Sun, 29 Oct 2006 19:34:05 +0100
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
To: Andrew Morton <akpm@...l.org>
Cc: Jeff Dike <jdike@...toit.com>,
user-mode-linux-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] Fix "Remove the use of _syscallX macros in UML"
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
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@...oo.it>
---
arch/um/os-Linux/sys-i386/tls.c | 3 +++
arch/um/os-Linux/tls.c | 1 +
arch/um/sys-i386/unmap.c | 11 +++++++----
arch/um/sys-x86_64/unmap.c | 11 +++++++----
4 files changed, 18 insertions(+), 8 deletions(-)
diff --git a/arch/um/os-Linux/sys-i386/tls.c b/arch/um/os-Linux/sys-i386/tls.c
index 6e945ab..2565320 100644
--- a/arch/um/os-Linux/sys-i386/tls.c
+++ b/arch/um/os-Linux/sys-i386/tls.c
@@ -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"
diff --git a/arch/um/os-Linux/tls.c b/arch/um/os-Linux/tls.c
index a2de258..9f7999f 100644
--- a/arch/um/os-Linux/tls.c
+++ b/arch/um/os-Linux/tls.c
@@ -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"
diff --git a/arch/um/sys-i386/unmap.c b/arch/um/sys-i386/unmap.c
index 8e55cd5..1b0ad0e 100644
--- a/arch/um/sys-i386/unmap.c
+++ b/arch/um/sys-i386/unmap.c
@@ -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);
diff --git a/arch/um/sys-x86_64/unmap.c b/arch/um/sys-x86_64/unmap.c
index 57c9286..f4a4bff 100644
--- a/arch/um/sys-x86_64/unmap.c
+++ b/arch/um/sys-x86_64/unmap.c
@@ -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);
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