syscalls.c

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/*
 *  Implementation of various system calls for Linux/PowerPC
 *
 *    Copyright (C) 1995-1996 Gary Thomas ([email protected])
 *
 * Derived from "arch/i386/kernel/sys_i386.c"
 * Adapted from the i386 version by Gary Thomas
 * Modified by Cort Dougan ([email protected])
 * and Paul Mackerras ([email protected]).
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/PPC
 * platform.
 *
 *  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; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.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/utsname.h>
#include <linux/file.h>
#include <linux/init.h>
#include <linux/personality.h>

#include <asm/uaccess.h>
#include <asm/syscalls.h>
#include <asm/time.h>
#include <asm/unistd.h>

static inline unsigned long do_mmap2(unsigned long addr, size_t len,
            unsigned long prot, unsigned long flags,
            unsigned long fd, unsigned long off, int shift)
{
    unsigned long ret = -EINVAL;

    if (!arch_validate_prot(prot))
        goto out;

    if (shift) {
        if (off & ((1 << shift) - 1))
            goto out;
        off >>= shift;
    }

    ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off);
out:
    return ret;
}

unsigned long sys_mmap2(unsigned long addr, size_t len,
            unsigned long prot, unsigned long flags,
            unsigned long fd, unsigned long pgoff)
{
    return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
}

unsigned long sys_mmap(unsigned long addr, size_t len,
               unsigned long prot, unsigned long flags,
               unsigned long fd, off_t offset)
{
    return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
}

#ifdef CONFIG_PPC32
/*
 * Due to some executables calling the wrong select we sometimes
 * get wrong args.  This determines how the args are being passed
 * (a single ptr to them all args passed) then calls
 * sys_select() with the appropriate args. -- Cort
 */
int
ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
{
    if ( (unsigned long)n >= 4096 )
    {
        unsigned long __user *buffer = (unsigned long __user *)n;
        if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
            || __get_user(n, buffer)
            || __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
            || __get_user(outp, ((fd_set  __user * __user *)(buffer+2)))
            || __get_user(exp, ((fd_set  __user * __user *)(buffer+3)))
            || __get_user(tvp, ((struct timeval  __user * __user *)(buffer+4))))
            return -EFAULT;
    }
    return sys_select(n, inp, outp, exp, tvp);
}
#endif

#ifdef CONFIG_PPC64
long ppc64_personality(unsigned long personality)
{
    long ret;

    if (personality(current->personality) == PER_LINUX32
        && personality(personality) == PER_LINUX)
        personality = (personality & ~PER_MASK) | PER_LINUX32;
    ret = sys_personality(personality);
    if (personality(ret) == PER_LINUX32)
        ret = (ret & ~PER_MASK) | PER_LINUX;
    return ret;
}
#endif

long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
              u32 len_high, u32 len_low)
{
    return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
                 (u64)len_high << 32 | len_low, advice);
}

void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
             unsigned long r6, unsigned long r7, unsigned long r8,
             struct pt_regs *regs)
{
    printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
           " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
           current, smp_processor_id());
}

void do_show_syscall_exit(unsigned long r3)
{
    printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
}