[ARM] 3109/1: old ABI compat: syscall wrappers for ABI impedance matching
Patch from Nicolas Pitre The difference between EABI and the legacy ABI may affect either structure member alignment and/or argument register selection. The patch has the details. Included are wrappers for the following syscalls: sys_stat64 sys_lstat64 sys_fstat64 sys_fcntl64 sys_epoll_ctl sys_epoll_wait sys_ipc sys_semop sys_semtimedop sys_pread64 sys_pwrite64 sys_truncate64 sys_ftruncate64 sys_readahead Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre
Russell King
Родитель
713c481519
Коммит
687ad01914
|
|
@ -20,6 +20,7 @@ obj-$(CONFIG_ARTHUR) += arthur.o
|
|||
obj-$(CONFIG_ISA_DMA) += dma-isa.o
|
||||
obj-$(CONFIG_PCI) += bios32.o
|
||||
obj-$(CONFIG_SMP) += smp.o
|
||||
obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o
|
||||
|
||||
obj-$(CONFIG_IWMMXT) += iwmmxt.o
|
||||
AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
|
||||
|
|
|
|||
|
|
@ -288,3 +288,35 @@ sys_mmap2:
|
|||
str r5, [sp, #4]
|
||||
b do_mmap2
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_OABI_COMPAT
|
||||
/*
|
||||
* These are syscalls with argument register differences
|
||||
*/
|
||||
|
||||
sys_oabi_pread64:
|
||||
stmia sp, {r3, r4}
|
||||
b sys_pread64
|
||||
|
||||
sys_oabi_pwrite64:
|
||||
stmia sp, {r3, r4}
|
||||
b sys_pwrite64
|
||||
|
||||
sys_oabi_truncate64:
|
||||
mov r3, r2
|
||||
mov r2, r1
|
||||
b sys_truncate64
|
||||
|
||||
sys_oabi_ftruncate64:
|
||||
mov r3, r2
|
||||
mov r2, r1
|
||||
b sys_ftruncate64
|
||||
|
||||
sys_oabi_readahead:
|
||||
str r3, [sp]
|
||||
mov r3, r2
|
||||
mov r2, r1
|
||||
b sys_readahead
|
||||
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,339 @@
|
|||
/*
|
||||
* arch/arm/kernel/sys_oabi-compat.c
|
||||
*
|
||||
* Compatibility wrappers for syscalls that are used from
|
||||
* old ABI user space binaries with an EABI kernel.
|
||||
*
|
||||
* Author: Nicolas Pitre
|
||||
* Created: Oct 7, 2005
|
||||
* Copyright: MontaVista Software, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
/*
|
||||
* The legacy ABI and the new ARM EABI have different rules making some
|
||||
* syscalls incompatible especially with structure arguments.
|
||||
* Most notably, Eabi says 64-bit members should be 64-bit aligned instead of
|
||||
* simply word aligned. EABI also pads structures to the size of the largest
|
||||
* member it contains instead of the invariant 32-bit.
|
||||
*
|
||||
* The following syscalls are affected:
|
||||
*
|
||||
* sys_stat64:
|
||||
* sys_lstat64:
|
||||
* sys_fstat64:
|
||||
*
|
||||
* struct stat64 has different sizes and some members are shifted
|
||||
* Compatibility wrappers are needed for them and provided below.
|
||||
*
|
||||
* sys_fcntl64:
|
||||
*
|
||||
* struct flock64 has different sizes and some members are shifted
|
||||
* A compatibility wrapper is needed and provided below.
|
||||
*
|
||||
* sys_statfs64:
|
||||
* sys_fstatfs64:
|
||||
*
|
||||
* struct statfs64 has extra padding with EABI growing its size from
|
||||
* 84 to 88. This struct is now __attribute__((packed,aligned(4)))
|
||||
* with a small assembly wrapper to force the sz argument to 84 if it is 88
|
||||
* to avoid copying the extra padding over user space unexpecting it.
|
||||
*
|
||||
* sys_newuname:
|
||||
*
|
||||
* struct new_utsname has no padding with EABI. No problem there.
|
||||
*
|
||||
* sys_epoll_ctl:
|
||||
* sys_epoll_wait:
|
||||
*
|
||||
* struct epoll_event has its second member shifted also affecting the
|
||||
* structure size. Compatibility wrappers are needed and provided below.
|
||||
*
|
||||
* sys_ipc:
|
||||
* sys_semop:
|
||||
* sys_semtimedop:
|
||||
*
|
||||
* struct sembuf loses its padding with EABI. Since arrays of them are
|
||||
* used they have to be copyed to remove the padding. Compatibility wrappers
|
||||
* provided below.
|
||||
*/
|
||||
|
||||
#include <linux/syscalls.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/fcntl.h>
|
||||
#include <linux/eventpoll.h>
|
||||
#include <linux/sem.h>
|
||||
#include <asm/ipc.h>
|
||||
#include <asm/uaccess.h>
|
||||
|
||||
struct oldabi_stat64 {
|
||||
unsigned long long st_dev;
|
||||
unsigned int __pad1;
|
||||
unsigned long __st_ino;
|
||||
unsigned int st_mode;
|
||||
unsigned int st_nlink;
|
||||
|
||||
unsigned long st_uid;
|
||||
unsigned long st_gid;
|
||||
|
||||
unsigned long long st_rdev;
|
||||
unsigned int __pad2;
|
||||
|
||||
long long st_size;
|
||||
unsigned long st_blksize;
|
||||
unsigned long long st_blocks;
|
||||
|
||||
unsigned long st_atime;
|
||||
unsigned long st_atime_nsec;
|
||||
|
||||
unsigned long st_mtime;
|
||||
unsigned long st_mtime_nsec;
|
||||
|
||||
unsigned long st_ctime;
|
||||
unsigned long st_ctime_nsec;
|
||||
|
||||
unsigned long long st_ino;
|
||||
} __attribute__ ((packed,aligned(4)));
|
||||
|
||||
static long cp_oldabi_stat64(struct kstat *stat,
|
||||
struct oldabi_stat64 __user *statbuf)
|
||||
{
|
||||
struct oldabi_stat64 tmp;
|
||||
|
||||
tmp.st_dev = huge_encode_dev(stat->dev);
|
||||
tmp.__pad1 = 0;
|
||||
tmp.__st_ino = stat->ino;
|
||||
tmp.st_mode = stat->mode;
|
||||
tmp.st_nlink = stat->nlink;
|
||||
tmp.st_uid = stat->uid;
|
||||
tmp.st_gid = stat->gid;
|
||||
tmp.st_rdev = huge_encode_dev(stat->rdev);
|
||||
tmp.st_size = stat->size;
|
||||
tmp.st_blocks = stat->blocks;
|
||||
tmp.__pad2 = 0;
|
||||
tmp.st_blksize = stat->blksize;
|
||||
tmp.st_atime = stat->atime.tv_sec;
|
||||
tmp.st_atime_nsec = stat->atime.tv_nsec;
|
||||
tmp.st_mtime = stat->mtime.tv_sec;
|
||||
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
|
||||
tmp.st_ctime = stat->ctime.tv_sec;
|
||||
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
|
||||
tmp.st_ino = stat->ino;
|
||||
return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
|
||||
}
|
||||
|
||||
asmlinkage long sys_oabi_stat64(char __user * filename,
|
||||
struct oldabi_stat64 __user * statbuf)
|
||||
{
|
||||
struct kstat stat;
|
||||
int error = vfs_stat(filename, &stat);
|
||||
if (!error)
|
||||
error = cp_oldabi_stat64(&stat, statbuf);
|
||||
return error;
|
||||
}
|
||||
|
||||
asmlinkage long sys_oabi_lstat64(char __user * filename,
|
||||
struct oldabi_stat64 __user * statbuf)
|
||||
{
|
||||
struct kstat stat;
|
||||
int error = vfs_lstat(filename, &stat);
|
||||
if (!error)
|
||||
error = cp_oldabi_stat64(&stat, statbuf);
|
||||
return error;
|
||||
}
|
||||
|
||||
asmlinkage long sys_oabi_fstat64(unsigned long fd,
|
||||
struct oldabi_stat64 __user * statbuf)
|
||||
{
|
||||
struct kstat stat;
|
||||
int error = vfs_fstat(fd, &stat);
|
||||
if (!error)
|
||||
error = cp_oldabi_stat64(&stat, statbuf);
|
||||
return error;
|
||||
}
|
||||
|
||||
struct oabi_flock64 {
|
||||
short l_type;
|
||||
short l_whence;
|
||||
loff_t l_start;
|
||||
loff_t l_len;
|
||||
pid_t l_pid;
|
||||
} __attribute__ ((packed,aligned(4)));
|
||||
|
||||
asmlinkage long sys_oabi_fcntl64(unsigned int fd, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct oabi_flock64 user;
|
||||
struct flock64 kernel;
|
||||
mm_segment_t fs = USER_DS; /* initialized to kill a warning */
|
||||
unsigned long local_arg = arg;
|
||||
int ret;
|
||||
|
||||
switch (cmd) {
|
||||
case F_GETLK64:
|
||||
case F_SETLK64:
|
||||
case F_SETLKW64:
|
||||
if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
|
||||
sizeof(user)))
|
||||
return -EFAULT;
|
||||
kernel.l_type = user.l_type;
|
||||
kernel.l_whence = user.l_whence;
|
||||
kernel.l_start = user.l_start;
|
||||
kernel.l_len = user.l_len;
|
||||
kernel.l_pid = user.l_pid;
|
||||
local_arg = (unsigned long)&kernel;
|
||||
fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
}
|
||||
|
||||
ret = sys_fcntl64(fd, cmd, local_arg);
|
||||
|
||||
switch (cmd) {
|
||||
case F_GETLK64:
|
||||
if (!ret) {
|
||||
user.l_type = kernel.l_type;
|
||||
user.l_whence = kernel.l_whence;
|
||||
user.l_start = kernel.l_start;
|
||||
user.l_len = kernel.l_len;
|
||||
user.l_pid = kernel.l_pid;
|
||||
if (copy_to_user((struct oabi_flock64 __user *)arg,
|
||||
&user, sizeof(user)))
|
||||
ret = -EFAULT;
|
||||
}
|
||||
case F_SETLK64:
|
||||
case F_SETLKW64:
|
||||
set_fs(fs);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct oabi_epoll_event {
|
||||
__u32 events;
|
||||
__u64 data;
|
||||
} __attribute__ ((packed,aligned(4)));
|
||||
|
||||
asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
|
||||
struct oabi_epoll_event __user *event)
|
||||
{
|
||||
struct oabi_epoll_event user;
|
||||
struct epoll_event kernel;
|
||||
mm_segment_t fs;
|
||||
long ret;
|
||||
|
||||
if (op == EPOLL_CTL_DEL)
|
||||
return sys_epoll_ctl(epfd, op, fd, NULL);
|
||||
if (copy_from_user(&user, event, sizeof(user)))
|
||||
return -EFAULT;
|
||||
kernel.events = user.events;
|
||||
kernel.data = user.data;
|
||||
fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
ret = sys_epoll_ctl(epfd, op, fd, &kernel);
|
||||
set_fs(fs);
|
||||
return ret;
|
||||
}
|
||||
|
||||
asmlinkage long sys_oabi_epoll_wait(int epfd,
|
||||
struct oabi_epoll_event __user *events,
|
||||
int maxevents, int timeout)
|
||||
{
|
||||
struct epoll_event *kbuf;
|
||||
mm_segment_t fs;
|
||||
long ret, err, i;
|
||||
|
||||
if (maxevents <= 0 || maxevents > (INT_MAX/sizeof(struct epoll_event)))
|
||||
return -EINVAL;
|
||||
kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
|
||||
if (!kbuf)
|
||||
return -ENOMEM;
|
||||
fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
|
||||
set_fs(fs);
|
||||
err = 0;
|
||||
for (i = 0; i < ret; i++) {
|
||||
__put_user_error(kbuf[i].events, &events->events, err);
|
||||
__put_user_error(kbuf[i].data, &events->data, err);
|
||||
events++;
|
||||
}
|
||||
kfree(kbuf);
|
||||
return err ? -EFAULT : ret;
|
||||
}
|
||||
|
||||
struct oabi_sembuf {
|
||||
unsigned short sem_num;
|
||||
short sem_op;
|
||||
short sem_flg;
|
||||
unsigned short __pad;
|
||||
};
|
||||
|
||||
asmlinkage long sys_oabi_semtimedop(int semid,
|
||||
struct oabi_sembuf __user *tsops,
|
||||
unsigned nsops,
|
||||
const struct timespec __user *timeout)
|
||||
{
|
||||
struct sembuf *sops;
|
||||
struct timespec local_timeout;
|
||||
long err;
|
||||
int i;
|
||||
|
||||
if (nsops < 1)
|
||||
return -EINVAL;
|
||||
sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
|
||||
if (!sops)
|
||||
return -ENOMEM;
|
||||
err = 0;
|
||||
for (i = 0; i < nsops; i++) {
|
||||
__get_user_error(sops[i].sem_num, &tsops->sem_num, err);
|
||||
__get_user_error(sops[i].sem_op, &tsops->sem_op, err);
|
||||
__get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
|
||||
tsops++;
|
||||
}
|
||||
if (timeout) {
|
||||
/* copy this as well before changing domain protection */
|
||||
err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
|
||||
timeout = &local_timeout;
|
||||
}
|
||||
if (err) {
|
||||
err = -EFAULT;
|
||||
} else {
|
||||
mm_segment_t fs = get_fs();
|
||||
set_fs(KERNEL_DS);
|
||||
err = sys_semtimedop(semid, sops, nsops, timeout);
|
||||
set_fs(fs);
|
||||
}
|
||||
kfree(sops);
|
||||
return err;
|
||||
}
|
||||
|
||||
asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
|
||||
unsigned nsops)
|
||||
{
|
||||
return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
|
||||
}
|
||||
|
||||
extern asmlinkage int sys_ipc(uint call, int first, int second, int third,
|
||||
void __user *ptr, long fifth);
|
||||
|
||||
asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
|
||||
void __user *ptr, long fifth)
|
||||
{
|
||||
switch (call & 0xffff) {
|
||||
case SEMOP:
|
||||
return sys_oabi_semtimedop(first,
|
||||
(struct oabi_sembuf __user *)ptr,
|
||||
second, NULL);
|
||||
case SEMTIMEDOP:
|
||||
return sys_oabi_semtimedop(first,
|
||||
(struct oabi_sembuf __user *)ptr,
|
||||
second,
|
||||
(const struct timespec __user *)fifth);
|
||||
default:
|
||||
return sys_ipc(call, first, second, third, ptr, fifth);
|
||||
}
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче