1 files changed, 183 insertions, 0 deletions

diff --git a/arch/tile/kernel/compat.c b/arch/tile/kernel/compat.c
new file mode 100644
index 00000000000..a374c99deeb
--- /dev/null
+++ b/arch/tile/kernel/compat.c
@@ -0,0 +1,183 @@
+/*
+ * 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 __user *)&t);
+        set_fs(old_fs);
+        if (put_compat_timespec(&t, interval))
+                return -EFAULT;
+        return ret;
+}
+
+ssize_t compat_sys_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
+                            size_t count)
+{
+        mm_segment_t old_fs = get_fs();
+        int ret;
+        off_t of;
+
+        if (offset && get_user(of, offset))
+                return -EFAULT;
+
+        set_fs(KERNEL_DS);
+        ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
+                           count);
+        set_fs(old_fs);
+
+        if (offset && put_user(of, offset))
+                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
+
+void *compat_sys_call_table[__NR_syscalls] = {
+        [0 ... __NR_syscalls-1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};