[PATCH 4/6] Remove the use of _syscallX macros in UML

Arnd Bergmann
2006-08-30T12:53:43Z

[-- Attachment #1: uml-syscalls.diff --]
[-- Type: text/plain, Size: 4694 bytes --]

User mode linux uses _syscallX() to call into the host kernel.
The recommended way to do this is to use the syscall() function
from libc.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Index: linux-cg/arch/um/os-Linux/process.c
===================================================================
--- linux-cg.orig/arch/um/os-Linux/process.c 2006-08-30 14:29:07.000000000 +0200
+++ linux-cg/arch/um/os-Linux/process.c 2006-08-30 14:31:40.000000000 +0200
@@ -12,6 +12,7 @@
#include <sys/mman.h>
#include <sys/wait.h>
#include <sys/mman.h>
+#include <sys/syscall.h>
#include "ptrace_user.h"
#include "os.h"
#include "user.h"
@@ -141,11 +142,9 @@
* syscalls, and also breaks with clone(), which does not unshare the TLS.
*/

-inline _syscall0(pid_t, getpid)
-
int os_getpid(void)
{
- return(getpid());
+ return(syscall(__NR_getpid));
}

int os_getpgrp(void)
Index: linux-cg/arch/um/os-Linux/sys-i386/tls.c
===================================================================
--- linux-cg.orig/arch/um/os-Linux/sys-i386/tls.c 2006-08-30 14:29:07.000000000 +0200
+++ linux-cg/arch/um/os-Linux/sys-i386/tls.c 2006-08-30 14:31:40.000000000 +0200
@@ -1,10 +1,9 @@
#include <errno.h>
#include <linux/unistd.h>
+#include <sys/syscall.h>
#include "sysdep/tls.h"
#include "user_util.h"

-static _syscall1(int, get_thread_area, user_desc_t *, u_info);
-
/* Checks whether host supports TLS, and sets *tls_min according to the value
* valid on the host.
* i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
@@ -17,7 +16,7 @@
user_desc_t info;
info.entry_number = val[i];

- if (get_thread_area(&info) == 0) {
+ if (syscall(__NR_get_thread_area, &info) == 0) {
*tls_min = val[i];
*supports_tls = 1;
return;
Index: linux-cg/arch/um/os-Linux/tls.c
===================================================================
--- linux-cg.orig/arch/um/os-Linux/tls.c 2006-08-30 14:29:07.000000000 +0200
+++ linux-cg/arch/um/os-Linux/tls.c 2006-08-30 14:31:40.000000000 +0200
@@ -1,5 +1,6 @@
#include <errno.h>
#include <sys/ptrace.h>
+#include <sys/syscall.h>
#include <asm/ldt.h>
#include "sysdep/tls.h"
#include "uml-config.h"
@@ -48,14 +49,11 @@
#ifdef UML_CONFIG_MODE_TT
#include "linux/unistd.h"

-static _syscall1(int, get_thread_area, user_desc_t *, u_info);
-static _syscall1(int, set_thread_area, user_desc_t *, u_info);
-
int do_set_thread_area_tt(user_desc_t *info)
{
int ret;

- ret = set_thread_area(info);
+ ret = syscall(__NR_set_thread_area,info);
if (ret < 0) {
ret = -errno;
}
@@ -66,7 +64,7 @@
{
int ret;

- ret = get_thread_area(info);
+ ret = syscall(__NR_get_thread_area,info);
if (ret < 0) {
ret = -errno;
}
Index: linux-cg/arch/um/sys-i386/unmap.c
===================================================================
--- linux-cg.orig/arch/um/sys-i386/unmap.c 2006-08-30 14:29:07.000000000 +0200
+++ linux-cg/arch/um/sys-i386/unmap.c 2006-08-30 14:31:40.000000000 +0200
@@ -5,20 +5,17 @@

#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(munmap(to, size) < 0){
+ if (syscall(__NR_munmap, to, size) < 0){
return(-1);
}
- if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
+ if (syscall(__NR_mmap2, to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
return(-1);
}
- if(munmap(from, size) < 0){
+ if (syscall(__NR_munmap, from, size) < 0){
return(-1);
}
return(0);
Index: linux-cg/arch/um/sys-x86_64/unmap.c
===================================================================
--- linux-cg.orig/arch/um/sys-x86_64/unmap.c 2006-08-30 14:29:07.000000000 +0200
+++ linux-cg/arch/um/sys-x86_64/unmap.c 2006-08-30 14:34:50.000000000 +0200
@@ -5,20 +5,17 @@

#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(munmap(to, size) < 0){
+ if (syscall(__NR_munmap, to, size) < 0){
return(-1);
}
- if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
+ if (syscall(__NR_mmap, to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){
return(-1);
}
- if(munmap(from, size) < 0){
+ if (syscall(__NR_munmap, from, size) < 0){
return(-1);
}
return(0);

--