sys_microblaze.c

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/*
 * Copyright (C) 2007-2009 Michal Simek <[email protected]>
 * Copyright (C) 2007-2009 PetaLogix
 * Copyright (C) 2007 John Williams <[email protected]>
 *
 * Copyright (C) 2006 Atmark Techno, Inc.
 *  Yasushi SHOJI <[email protected]>
 *  Tetsuya OHKAWA <[email protected]>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/syscalls.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/sys.h>
#include <linux/ipc.h>
#include <linux/file.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/semaphore.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>
#include <linux/slab.h>

#include <asm/syscalls.h>

asmlinkage long microblaze_vfork(struct pt_regs *regs)
{
    return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
                        regs, 0, NULL, NULL);
}

asmlinkage long microblaze_clone(int flags, unsigned long stack,
                            struct pt_regs *regs)
{
    if (!stack)
        stack = regs->r1;
    return do_fork(flags, stack, regs, 0, NULL, NULL);
}

asmlinkage long microblaze_execve(const char __user *filenamei,
                  const char __user *const __user *argv,
                  const char __user *const __user *envp,
                  struct pt_regs *regs)
{
    int error;
    struct filename *filename;

    filename = getname(filenamei);
    error = PTR_ERR(filename);
    if (IS_ERR(filename))
        goto out;
    error = do_execve(filename->name, argv, envp, regs);
    putname(filename);
out:
    return error;
}

asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
            unsigned long prot, unsigned long flags,
            unsigned long fd, off_t pgoff)
{
    if (pgoff & ~PAGE_MASK)
        return -EINVAL;

    return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename,
          const char *const argv[],
          const char *const envp[])
{
    register const char *__a __asm__("r5") = filename;
    register const void *__b __asm__("r6") = argv;
    register const void *__c __asm__("r7") = envp;
    register unsigned long __syscall __asm__("r12") = __NR_execve;
    register unsigned long __ret __asm__("r3");
    __asm__ __volatile__ ("brki r14, 0x8"
            : "=r" (__ret), "=r" (__syscall)
            : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
            : "r4", "r8", "r9",
            "r10", "r11", "r14", "cc", "memory");
    return __ret;
}