1 files changed, 126 insertions, 0 deletions

diff --git a/arch/unicore32/kernel/sys.c b/arch/unicore32/kernel/sys.c
new file mode 100644
index 00000000000..3afe60a39ac
--- /dev/null
+++ b/arch/unicore32/kernel/sys.c
@@ -0,0 +1,126 @@
+/*
+ * linux/arch/unicore32/kernel/sys.c
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/stat.h>
+#include <linux/syscalls.h>
+#include <linux/mman.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/ipc.h>
+#include <linux/uaccess.h>
+
+#include <asm/syscalls.h>
+#include <asm/cacheflush.h>
+
+/* Clone a task - this clones the calling program thread.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage long __sys_clone(unsigned long clone_flags, unsigned long newsp,
+                         void __user *parent_tid, void __user *child_tid,
+                         struct pt_regs *regs)
+{
+        if (!newsp)
+                newsp = regs->UCreg_sp;
+
+        return do_fork(clone_flags, newsp, regs, 0,
+                        parent_tid, child_tid);
+}
+
+/* sys_execve() executes a new program.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage long __sys_execve(const char __user *filename,
+                          const char __user *const __user *argv,
+                          const char __user *const __user *envp,
+                          struct pt_regs *regs)
+{
+        int error;
+        char *fn;
+
+        fn = getname(filename);
+        error = PTR_ERR(fn);
+        if (IS_ERR(fn))
+                goto out;
+        error = do_execve(fn, argv, envp, regs);
+        putname(fn);
+out:
+        return error;
+}
+
+int kernel_execve(const char *filename,
+                  const char *const argv[],
+                  const char *const envp[])
+{
+        struct pt_regs regs;
+        int ret;
+
+        memset(&regs, 0, sizeof(struct pt_regs));
+        ret = do_execve(filename,
+                        (const char __user *const __user *)argv,
+                        (const char __user *const __user *)envp, &regs);
+        if (ret < 0)
+                goto out;
+
+        /*
+         * Save argc to the register structure for userspace.
+         */
+        regs.UCreg_00 = ret;
+
+        /*
+         * We were successful.  We won't be returning to our caller, but
+         * instead to user space by manipulating the kernel stack.
+         */
+        asm("add        r0, %0, %1\n\t"
+                "mov    r1, %2\n\t"
+                "mov    r2, %3\n\t"
+                "mov    r22, #0\n\t"    /* not a syscall */
+                "mov    r23, %0\n\t"    /* thread structure */
+                "b.l    memmove\n\t"    /* copy regs to top of stack */
+                "mov    sp, r0\n\t"     /* reposition stack pointer */
+                "b      ret_to_user"
+                :
+                : "r" (current_thread_info()),
+                  "Ir" (THREAD_START_SP - sizeof(regs)),
+                  "r" (&regs),
+                  "Ir" (sizeof(regs))
+                : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
+
+ out:
+        return ret;
+}
+EXPORT_SYMBOL(kernel_execve);
+
+/* Note: used by the compat code even in 64-bit Linux. */
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
+                unsigned long, prot, unsigned long, flags,
+                unsigned long, fd, unsigned long, off_4k)
+{
+        return sys_mmap_pgoff(addr, len, prot, flags, fd,
+                              off_4k);
+}
+
+/* Provide the actual syscall number to call mapping. */
+#undef __SYSCALL
+#define __SYSCALL(nr, call)     [nr] = (call),
+
+/* Note that we don't include <linux/unistd.h> but <asm/unistd.h> */
+void *sys_call_table[__NR_syscalls] = {
+        [0 ... __NR_syscalls-1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};