| /* |
| * Implementation of various system calls for Linux/PowerPC |
| * |
| * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| * |
| * Derived from "arch/i386/kernel/sys_i386.c" |
| * Adapted from the i386 version by Gary Thomas |
| * Modified by Cort Dougan (cort@cs.nmt.edu) |
| * and Paul Mackerras (paulus@cs.anu.edu.au). |
| * |
| * 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> |
| |
| /* |
| * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| * |
| * This is really horribly ugly. |
| */ |
| int sys_ipc(uint call, int first, unsigned long second, long third, |
| void __user *ptr, long fifth) |
| { |
| int version, ret; |
| |
| version = call >> 16; /* hack for backward compatibility */ |
| call &= 0xffff; |
| |
| ret = -ENOSYS; |
| switch (call) { |
| case SEMOP: |
| ret = sys_semtimedop(first, (struct sembuf __user *)ptr, |
| (unsigned)second, NULL); |
| break; |
| case SEMTIMEDOP: |
| ret = sys_semtimedop(first, (struct sembuf __user *)ptr, |
| (unsigned)second, |
| (const struct timespec __user *) fifth); |
| break; |
| case SEMGET: |
| ret = sys_semget (first, (int)second, third); |
| break; |
| case SEMCTL: { |
| union semun fourth; |
| |
| ret = -EINVAL; |
| if (!ptr) |
| break; |
| if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr))) |
| break; |
| ret = sys_semctl(first, (int)second, third, fourth); |
| break; |
| } |
| case MSGSND: |
| ret = sys_msgsnd(first, (struct msgbuf __user *)ptr, |
| (size_t)second, third); |
| break; |
| case MSGRCV: |
| switch (version) { |
| case 0: { |
| struct ipc_kludge tmp; |
| |
| ret = -EINVAL; |
| if (!ptr) |
| break; |
| if ((ret = copy_from_user(&tmp, |
| (struct ipc_kludge __user *) ptr, |
| sizeof (tmp)) ? -EFAULT : 0)) |
| break; |
| ret = sys_msgrcv(first, tmp.msgp, (size_t) second, |
| tmp.msgtyp, third); |
| break; |
| } |
| default: |
| ret = sys_msgrcv (first, (struct msgbuf __user *) ptr, |
| (size_t)second, fifth, third); |
| break; |
| } |
| break; |
| case MSGGET: |
| ret = sys_msgget((key_t)first, (int)second); |
| break; |
| case MSGCTL: |
| ret = sys_msgctl(first, (int)second, |
| (struct msqid_ds __user *)ptr); |
| break; |
| case SHMAT: { |
| ulong raddr; |
| ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr); |
| if (ret) |
| break; |
| ret = put_user(raddr, (ulong __user *) third); |
| break; |
| } |
| case SHMDT: |
| ret = sys_shmdt((char __user *)ptr); |
| break; |
| case SHMGET: |
| ret = sys_shmget(first, (size_t)second, third); |
| break; |
| case SHMCTL: |
| ret = sys_shmctl(first, (int)second, |
| (struct shmid_ds __user *)ptr); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * sys_pipe() is the normal C calling standard for creating |
| * a pipe. It's not the way unix traditionally does this, though. |
| */ |
| int sys_pipe(int __user *fildes) |
| { |
| int fd[2]; |
| int error; |
| |
| error = do_pipe(fd); |
| if (!error) { |
| if (copy_to_user(fildes, fd, 2*sizeof(int))) |
| error = -EFAULT; |
| } |
| return error; |
| } |
| |
| 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) |
| { |
| struct file * file = NULL; |
| unsigned long ret = -EINVAL; |
| |
| if (shift) { |
| if (off & ((1 << shift) - 1)) |
| goto out; |
| off >>= shift; |
| } |
| |
| ret = -EBADF; |
| if (!(flags & MAP_ANONYMOUS)) { |
| if (!(file = fget(fd))) |
| goto out; |
| } |
| |
| flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
| |
| down_write(¤t->mm->mmap_sem); |
| ret = do_mmap_pgoff(file, addr, len, prot, flags, off); |
| up_write(¤t->mm->mmap_sem); |
| if (file) |
| fput(file); |
| 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 == PER_LINUX) |
| personality = PER_LINUX32; |
| ret = sys_personality(personality); |
| if (ret == PER_LINUX32) |
| ret = PER_LINUX; |
| return ret; |
| } |
| #endif |
| |
| #ifdef CONFIG_PPC64 |
| #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32) |
| #else |
| #define OVERRIDE_MACHINE 0 |
| #endif |
| |
| static inline int override_machine(char __user *mach) |
| { |
| if (OVERRIDE_MACHINE) { |
| /* change ppc64 to ppc */ |
| if (__put_user(0, mach+3) || __put_user(0, mach+4)) |
| return -EFAULT; |
| } |
| return 0; |
| } |
| |
| long ppc_newuname(struct new_utsname __user * name) |
| { |
| int err = 0; |
| |
| down_read(&uts_sem); |
| if (copy_to_user(name, utsname(), sizeof(*name))) |
| err = -EFAULT; |
| up_read(&uts_sem); |
| if (!err) |
| err = override_machine(name->machine); |
| return err; |
| } |
| |
| int sys_uname(struct old_utsname __user *name) |
| { |
| int err = 0; |
| |
| down_read(&uts_sem); |
| if (copy_to_user(name, utsname(), sizeof(*name))) |
| err = -EFAULT; |
| up_read(&uts_sem); |
| if (!err) |
| err = override_machine(name->machine); |
| return err; |
| } |
| |
| int sys_olduname(struct oldold_utsname __user *name) |
| { |
| int error; |
| |
| if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) |
| return -EFAULT; |
| |
| down_read(&uts_sem); |
| error = __copy_to_user(&name->sysname, &utsname()->sysname, |
| __OLD_UTS_LEN); |
| error |= __put_user(0, name->sysname + __OLD_UTS_LEN); |
| error |= __copy_to_user(&name->nodename, &utsname()->nodename, |
| __OLD_UTS_LEN); |
| error |= __put_user(0, name->nodename + __OLD_UTS_LEN); |
| error |= __copy_to_user(&name->release, &utsname()->release, |
| __OLD_UTS_LEN); |
| error |= __put_user(0, name->release + __OLD_UTS_LEN); |
| error |= __copy_to_user(&name->version, &utsname()->version, |
| __OLD_UTS_LEN); |
| error |= __put_user(0, name->version + __OLD_UTS_LEN); |
| error |= __copy_to_user(&name->machine, &utsname()->machine, |
| __OLD_UTS_LEN); |
| error |= override_machine(name->machine); |
| up_read(&uts_sem); |
| |
| return error? -EFAULT: 0; |
| } |
| |
| 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()); |
| } |