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ce10d97905
This patch fixes some bugs in the ppc64 PER_LINUX32 implementation, noted by Juergen Kreileder: * uname(2) doesn't respect PER_LINUX32, it returns 'ppc64' instead of 'ppc' * Child processes of a PER_LINUX32 process don't inherit PER_LINUX32 Along the way I took the opportunity to move things around so that sys_ppc32.c only has 32-bit syscall emulation functions and to remove the obsolete "fakeppc" command line option. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
268 lines
5.9 KiB
C
268 lines
5.9 KiB
C
/*
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* linux/arch/ppc64/kernel/sys_ppc.c
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*
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* PowerPC version
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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/smp.h>
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#include <linux/smp_lock.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/ipc.h>
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#include <asm/semaphore.h>
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#include <asm/time.h>
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#include <asm/unistd.h>
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extern unsigned long wall_jiffies;
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void
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check_bugs(void)
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{
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}
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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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asmlinkage int
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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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switch (version) {
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default: {
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ulong raddr;
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ret = do_shmat(first, (char __user *) ptr,
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(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 1: /* iBCS2 emulator entry point */
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ret = -EINVAL;
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if (!segment_eq(get_fs(), get_ds()))
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break;
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ret = do_shmat(first, (char __user *)ptr,
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(int)second, (ulong *)third);
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break;
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}
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break;
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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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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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asmlinkage int sys_pipe(int __user *fildes)
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{
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int fd[2];
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int error;
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error = do_pipe(fd);
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if (!error) {
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if (copy_to_user(fildes, fd, 2*sizeof(int)))
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error = -EFAULT;
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}
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return error;
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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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struct file * file = NULL;
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unsigned long 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(file, addr, len, prot, flags, offset);
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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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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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long ppc64_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, &system_utsname, sizeof(*name)))
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err = -EFAULT;
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up_read(&uts_sem);
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if (!err && personality(current->personality) == PER_LINUX32) {
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/* change ppc64 to ppc */
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if (__put_user(0, name->machine + 3)
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|| __put_user(0, name->machine + 4))
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err = -EFAULT;
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}
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return err;
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}
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asmlinkage time_t sys64_time(time_t __user * tloc)
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{
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time_t secs;
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time_t usecs;
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long tb_delta = tb_ticks_since(tb_last_stamp);
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tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
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secs = xtime.tv_sec;
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usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
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while (usecs >= USEC_PER_SEC) {
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++secs;
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usecs -= USEC_PER_SEC;
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}
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if (tloc) {
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if (put_user(secs,tloc))
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secs = -EFAULT;
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}
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return secs;
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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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