diff options
Diffstat (limited to 'arch/tile/kernel/compat.c')
-rw-r--r-- | arch/tile/kernel/compat.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/tile/kernel/compat.c b/arch/tile/kernel/compat.c new file mode 100644 index 00000000000..b1e06d04155 --- /dev/null +++ b/arch/tile/kernel/compat.c @@ -0,0 +1,167 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/* Adjust unistd.h to provide 32-bit numbers and functions. */ +#define __SYSCALL_COMPAT + +#include <linux/compat.h> +#include <linux/msg.h> +#include <linux/syscalls.h> +#include <linux/kdev_t.h> +#include <linux/fs.h> +#include <linux/fcntl.h> +#include <linux/smp_lock.h> +#include <linux/uaccess.h> +#include <linux/signal.h> +#include <asm/syscalls.h> + +/* + * Syscalls that take 64-bit numbers traditionally take them in 32-bit + * "high" and "low" value parts on 32-bit architectures. + * In principle, one could imagine passing some register arguments as + * fully 64-bit on TILE-Gx in 32-bit mode, but it seems easier to + * adapt the usual convention. + */ + +long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high) +{ + return sys_truncate(filename, ((loff_t)high << 32) | low); +} + +long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high) +{ + return sys_ftruncate(fd, ((loff_t)high << 32) | low); +} + +long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count, + u32 dummy, u32 low, u32 high) +{ + return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low); +} + +long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count, + u32 dummy, u32 low, u32 high) +{ + return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low); +} + +long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len) +{ + return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len); +} + +long compat_sys_sync_file_range2(int fd, unsigned int flags, + u32 offset_lo, u32 offset_hi, + u32 nbytes_lo, u32 nbytes_hi) +{ + return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo, + ((loff_t)nbytes_hi << 32) | nbytes_lo, + flags); +} + +long compat_sys_fallocate(int fd, int mode, + u32 offset_lo, u32 offset_hi, + u32 len_lo, u32 len_hi) +{ + return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo, + ((loff_t)len_hi << 32) | len_lo); +} + + + +long compat_sys_sched_rr_get_interval(compat_pid_t pid, + struct compat_timespec __user *interval) +{ + struct timespec t; + int ret; + mm_segment_t old_fs = get_fs(); + + set_fs(KERNEL_DS); + ret = sys_sched_rr_get_interval(pid, + (struct timespec __force __user *)&t); + set_fs(old_fs); + if (put_compat_timespec(&t, interval)) + return -EFAULT; + return ret; +} + +/* + * The usual compat_sys_msgsnd() and _msgrcv() seem to be assuming + * some different calling convention than our normal 32-bit tile code. + */ + +/* Already defined in ipc/compat.c, but we need it here. */ +struct compat_msgbuf { + compat_long_t mtype; + char mtext[1]; +}; + +long tile_compat_sys_msgsnd(int msqid, + struct compat_msgbuf __user *msgp, + size_t msgsz, int msgflg) +{ + compat_long_t mtype; + + if (get_user(mtype, &msgp->mtype)) + return -EFAULT; + return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg); +} + +long tile_compat_sys_msgrcv(int msqid, + struct compat_msgbuf __user *msgp, + size_t msgsz, long msgtyp, int msgflg) +{ + long err, mtype; + + err = do_msgrcv(msqid, &mtype, msgp->mtext, msgsz, msgtyp, msgflg); + if (err < 0) + goto out; + + if (put_user(mtype, &msgp->mtype)) + err = -EFAULT; + out: + return err; +} + +/* Provide the compat syscall number to call mapping. */ +#undef __SYSCALL +#define __SYSCALL(nr, call) [nr] = (compat_##call), + +/* The generic versions of these don't work for Tile. */ +#define compat_sys_msgrcv tile_compat_sys_msgrcv +#define compat_sys_msgsnd tile_compat_sys_msgsnd + +/* See comments in sys.c */ +#define compat_sys_fadvise64 sys32_fadvise64 +#define compat_sys_fadvise64_64 sys32_fadvise64_64 +#define compat_sys_readahead sys32_readahead +#define compat_sys_sync_file_range compat_sys_sync_file_range2 + +/* The native 64-bit "struct stat" matches the 32-bit "struct stat64". */ +#define compat_sys_stat64 sys_newstat +#define compat_sys_lstat64 sys_newlstat +#define compat_sys_fstat64 sys_newfstat +#define compat_sys_fstatat64 sys_newfstatat + +/* Pass full 64-bit values through ptrace. */ +#define compat_sys_ptrace tile_compat_sys_ptrace + +/* + * Note that we can't include <linux/unistd.h> here since the header + * guard will defeat us; <asm/unistd.h> checks for __SYSCALL as well. + */ +void *compat_sys_call_table[__NR_syscalls] = { + [0 ... __NR_syscalls-1] = sys_ni_syscall, +#include <asm/unistd.h> +}; |