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-rw-r--r--arch/tile/kernel/compat.c167
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 000000000000..b1e06d041555
--- /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>
+};