/* * 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. * * arch/sh64/kernel/sys_sh64.c * * Copyright (C) 2000, 2001 Paolo Alberelli * * This file contains various random system calls that * have a non-standard calling sequence on the Linux/SH5 * platform. * * Mostly taken from i386 version. * */ #include <linux/errno.h> #include <linux/rwsem.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/stat.h> #include <linux/mman.h> #include <linux/file.h> #include <linux/utsname.h> #include <linux/syscalls.h> #include <asm/uaccess.h> #include <asm/ipc.h> #include <asm/ptrace.h> #define REG_3 3 /* * sys_pipe() is the normal C calling standard for creating * a pipe. It's not the way Unix traditionally does this, though. */ #ifdef NEW_PIPE_IMPLEMENTATION asmlinkage int sys_pipe(unsigned long * fildes, unsigned long dummy_r3, unsigned long dummy_r4, unsigned long dummy_r5, unsigned long dummy_r6, unsigned long dummy_r7, struct pt_regs * regs) /* r8 = pt_regs forced by entry.S */ { int fd[2]; int ret; ret = do_pipe(fd); if (ret == 0) /* *********************************************************************** * To avoid the copy_to_user we prefer to break the ABIs convention, * * packing the valid pair of file IDs into a single register (r3); * * while r2 is the return code as defined by the sh5-ABIs. * * BE CAREFUL: pipe stub, into glibc, must be aware of this solution * *********************************************************************** #ifdef __LITTLE_ENDIAN__ regs->regs[REG_3] = (((unsigned long long) fd[1]) << 32) | ((unsigned long long) fd[0]); #else regs->regs[REG_3] = (((unsigned long long) fd[0]) << 32) | ((unsigned long long) fd[1]); #endif */ /* although not very clever this is endianess independent */ regs->regs[REG_3] = (unsigned long long) *((unsigned long long *) fd); return ret; } #else asmlinkage int sys_pipe(unsigned long * 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; } #endif /* * To avoid cache alias, we map the shard page with same color. */ #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct vm_area_struct *vma; if (flags & MAP_FIXED) { /* We do not accept a shared mapping if it would violate * cache aliasing constraints. */ if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1))) return -EINVAL; return addr; } if (len > TASK_SIZE) return -ENOMEM; if (!addr) addr = TASK_UNMAPPED_BASE; if (flags & MAP_PRIVATE) addr = PAGE_ALIGN(addr); else addr = COLOUR_ALIGN(addr); for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { /* At this point: (!vma || addr < vma->vm_end). */ if (TASK_SIZE - len < addr) return -ENOMEM; if (!vma || addr + len <= vma->vm_start) return addr; addr = vma->vm_end; if (!(flags & MAP_PRIVATE)) addr = COLOUR_ALIGN(addr); } } /* common code for old and new mmaps */ static inline long do_mmap2( unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { int error = -EBADF; struct file * file = NULL; flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return error; } asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { return do_mmap2(addr, len, prot, flags, fd, pgoff); } asmlinkage int old_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, int fd, unsigned long off) { if (off & ~PAGE_MASK) return -EINVAL; return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT); } /* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly. */ asmlinkage int sys_ipc(uint call, int first, int second, int third, void __user *ptr, long fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; if (call <= SEMCTL) switch (call) { case SEMOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, (const struct timespec __user *)fifth); case SEMGET: return sys_semget (first, second, third); case SEMCTL: { union semun fourth; if (!ptr) return -EINVAL; if (get_user(fourth.__pad, (void * __user *) ptr)) return -EFAULT; return sys_semctl (first, second, third, fourth); } default: return -EINVAL; } if (call <= MSGCTL) switch (call) { case MSGSND: return sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) return -EFAULT; return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); } default: return sys_msgrcv (first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return sys_msgget ((key_t) first, second); case MSGCTL: return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); default: return -EINVAL; } if (call <= SHMCTL) switch (call) { case SHMAT: switch (version) { default: { ulong raddr; ret = do_shmat (first, (char __user *) ptr, second, &raddr); if (ret) return ret; return put_user (raddr, (ulong __user *) third); } case 1: /* iBCS2 emulator entry point */ if (!segment_eq(get_fs(), get_ds())) return -EINVAL; return do_shmat (first, (char __user *) ptr, second, (ulong *) third); } case SHMDT: return sys_shmdt ((char __user *)ptr); case SHMGET: return sys_shmget (first, second, third); case SHMCTL: return sys_shmctl (first, second, (struct shmid_ds __user *) ptr); default: return -EINVAL; } return -EINVAL; } asmlinkage int sys_uname(struct old_utsname * name) { int err; if (!name) return -EFAULT; down_read(&uts_sem); err=copy_to_user(name, &system_utsname, sizeof (*name)); up_read(&uts_sem); return err?-EFAULT:0; }