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d35c7b0e54
This replaces the duplicated arch-specific versions of "sys_pipe()" with one unified implementation. This removes almost 250 lines of duplicated code. It's marked __weak, so that *if* an architecture wants to override the default implementation it can do so by simply having its own replacement version, since many architectures use alternate calling conventions for the 'pipe()' system call for legacy reasons (ie traditional UNIX implementations often return the two file descriptors in registers) I still haven't changed the cris version even though Linus says the BKL isn't needed. The arch maintainer can easily do it if there are really no obstacles. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
313 lines
7.8 KiB
C
313 lines
7.8 KiB
C
/*
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* Implementation of various system calls for Linux/PowerPC
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*
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Derived from "arch/i386/kernel/sys_i386.c"
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* Adapted from the i386 version by Gary Thomas
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au).
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/PPC
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* platform.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/syscalls.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/sys.h>
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#include <linux/ipc.h>
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#include <linux/utsname.h>
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#include <linux/file.h>
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#include <linux/init.h>
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#include <linux/personality.h>
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#include <asm/uaccess.h>
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#include <asm/syscalls.h>
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#include <asm/time.h>
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#include <asm/unistd.h>
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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int sys_ipc(uint call, int first, unsigned long second, long third,
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void __user *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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ret = -ENOSYS;
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switch (call) {
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case SEMOP:
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ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
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(unsigned)second, NULL);
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break;
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case SEMTIMEDOP:
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ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
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(unsigned)second,
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(const struct timespec __user *) fifth);
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break;
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case SEMGET:
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ret = sys_semget (first, (int)second, third);
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break;
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case SEMCTL: {
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union semun fourth;
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ret = -EINVAL;
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if (!ptr)
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break;
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if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
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break;
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ret = sys_semctl(first, (int)second, third, fourth);
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break;
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}
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case MSGSND:
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ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
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(size_t)second, third);
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break;
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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ret = -EINVAL;
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if (!ptr)
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break;
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if ((ret = copy_from_user(&tmp,
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(struct ipc_kludge __user *) ptr,
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sizeof (tmp)) ? -EFAULT : 0))
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break;
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ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
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tmp.msgtyp, third);
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break;
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}
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default:
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ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
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(size_t)second, fifth, third);
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break;
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}
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break;
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case MSGGET:
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ret = sys_msgget((key_t)first, (int)second);
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break;
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case MSGCTL:
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ret = sys_msgctl(first, (int)second,
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(struct msqid_ds __user *)ptr);
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break;
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case SHMAT: {
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ulong raddr;
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ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
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if (ret)
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break;
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ret = put_user(raddr, (ulong __user *) third);
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break;
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}
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case SHMDT:
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ret = sys_shmdt((char __user *)ptr);
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break;
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case SHMGET:
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ret = sys_shmget(first, (size_t)second, third);
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break;
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case SHMCTL:
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ret = sys_shmctl(first, (int)second,
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(struct shmid_ds __user *)ptr);
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break;
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}
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return ret;
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}
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static inline unsigned long do_mmap2(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long off, int shift)
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{
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struct file * file = NULL;
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unsigned long ret = -EINVAL;
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if (shift) {
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if (off & ((1 << shift) - 1))
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goto out;
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off >>= shift;
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}
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ret = -EBADF;
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if (!(flags & MAP_ANONYMOUS)) {
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if (!(file = fget(fd)))
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goto out;
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}
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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down_write(¤t->mm->mmap_sem);
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ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return ret;
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}
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unsigned long sys_mmap2(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
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}
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unsigned long sys_mmap(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, off_t offset)
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{
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return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
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}
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#ifdef CONFIG_PPC32
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/*
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* Due to some executables calling the wrong select we sometimes
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* get wrong args. This determines how the args are being passed
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* (a single ptr to them all args passed) then calls
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* sys_select() with the appropriate args. -- Cort
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*/
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int
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ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
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{
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if ( (unsigned long)n >= 4096 )
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{
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unsigned long __user *buffer = (unsigned long __user *)n;
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if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
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|| __get_user(n, buffer)
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|| __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
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|| __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
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|| __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
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|| __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
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return -EFAULT;
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}
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return sys_select(n, inp, outp, exp, tvp);
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}
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#endif
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#ifdef CONFIG_PPC64
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long ppc64_personality(unsigned long personality)
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{
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long ret;
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if (personality(current->personality) == PER_LINUX32
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&& personality == PER_LINUX)
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personality = PER_LINUX32;
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ret = sys_personality(personality);
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if (ret == PER_LINUX32)
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ret = PER_LINUX;
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return ret;
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}
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#endif
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#ifdef CONFIG_PPC64
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#define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
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#else
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#define OVERRIDE_MACHINE 0
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#endif
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static inline int override_machine(char __user *mach)
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{
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if (OVERRIDE_MACHINE) {
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/* change ppc64 to ppc */
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if (__put_user(0, mach+3) || __put_user(0, mach+4))
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return -EFAULT;
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}
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return 0;
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}
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long ppc_newuname(struct new_utsname __user * name)
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{
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int err = 0;
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down_read(&uts_sem);
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if (copy_to_user(name, utsname(), sizeof(*name)))
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err = -EFAULT;
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up_read(&uts_sem);
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if (!err)
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err = override_machine(name->machine);
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return err;
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}
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int sys_uname(struct old_utsname __user *name)
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{
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int err = 0;
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down_read(&uts_sem);
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if (copy_to_user(name, utsname(), sizeof(*name)))
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err = -EFAULT;
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up_read(&uts_sem);
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if (!err)
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err = override_machine(name->machine);
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return err;
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}
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int sys_olduname(struct oldold_utsname __user *name)
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{
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int error;
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if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
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return -EFAULT;
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down_read(&uts_sem);
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error = __copy_to_user(&name->sysname, &utsname()->sysname,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->nodename, &utsname()->nodename,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->release, &utsname()->release,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->release + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->version, &utsname()->version,
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__OLD_UTS_LEN);
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error |= __put_user(0, name->version + __OLD_UTS_LEN);
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error |= __copy_to_user(&name->machine, &utsname()->machine,
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__OLD_UTS_LEN);
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error |= override_machine(name->machine);
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up_read(&uts_sem);
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return error? -EFAULT: 0;
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}
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long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
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u32 len_high, u32 len_low)
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{
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return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
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(u64)len_high << 32 | len_low, advice);
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}
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void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7, unsigned long r8,
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struct pt_regs *regs)
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{
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printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
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" cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
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current, smp_processor_id());
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}
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void do_show_syscall_exit(unsigned long r3)
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{
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printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
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}
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