patch-2.1.80 linux/arch/arm/kernel/sys_arm.c

• Lines: 373
• Date: Tue Jan 20 16:39:41 1998
• Orig file: v2.1.79/linux/arch/arm/kernel/sys_arm.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.79/linux/arch/arm/kernel/sys_arm.c linux/arch/arm/kernel/sys_arm.c
@@ -0,0 +1,372 @@
+/*
+ * linux/arch/arm/kernel/sys_arm.c
+ *
+ * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
+ * Copyright (C) 1995, 1996 Russell King.
+ * 
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/arm
+ * platform.
+ */
+
+#include <linux/errno.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 <asm/uaccess.h>
+#include <asm/ipc.h>
+
+/*
+ * Constant strings used in inlined functions in header files
+ */
+/* proc/system.h */
+const char xchg_str[] = "xchg";
+/* arch/dma.h */
+const char dma_str[] = "%s: dma %d not supported\n";
+
+/*
+ * sys_pipe() is the normal C calling standard for creating
+ * a pipe. It's not the way unix traditionally does this, though.
+ */
+asmlinkage int sys_pipe(unsigned long * fildes)
+{
+	int fd[2];
+	int error;
+
+	lock_kernel();
+	error = do_pipe(fd);
+	unlock_kernel();
+	if (!error) {
+		if (copy_to_user(fildes, fd, 2*sizeof(int)))
+			error = -EFAULT;
+	}
+	return error;
+}
+
+/*
+ * Perform the select(nd, in, out, ex, tv) and mmap() system
+ * calls. ARM Linux didn't use to be able to handle more than
+ * 4 system call parameters, so these system calls used a memory
+ * block for parameter passing..
+ */
+
+struct mmap_arg_struct {
+	unsigned long addr;
+	unsigned long len;
+	unsigned long prot;
+	unsigned long flags;
+	unsigned long fd;
+	unsigned long offset;
+};
+
+asmlinkage int old_mmap(struct mmap_arg_struct *arg)
+{
+	int error = -EFAULT;
+	struct file * file = NULL;
+	struct mmap_arg_struct a;
+
+	lock_kernel();
+	if (copy_from_user(&a, arg, sizeof(a)))
+		goto out;
+	if (!(a.flags & MAP_ANONYMOUS)) {
+		error = -EBADF;
+		if (a.fd >= NR_OPEN || !(file = current->files->fd[a.fd]))
+			goto out;
+	}
+	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+	error = do_mmap(file, a.addr, a.len, a.prot, a.flags, a.offset);
+out:
+	unlock_kernel();
+	return error;
+}
+
+
+extern asmlinkage int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
+
+struct sel_arg_struct {
+	unsigned long n;
+	fd_set *inp, *outp, *exp;
+	struct timeval *tvp;
+};
+
+asmlinkage int old_select(struct sel_arg_struct *arg)
+{
+	struct sel_arg_struct a;
+
+	if (copy_from_user(&a, arg, sizeof(a)))
+		return -EFAULT;
+	/* sys_select() does the appropriate kernel locking */
+	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
+}
+
+/*
+ * 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 *ptr, long fifth)
+{
+	int version, ret;
+
+	lock_kernel();
+	version = call >> 16; /* hack for backward compatibility */
+	call &= 0xffff;
+
+	if (call <= SEMCTL)
+		switch (call) {
+		case SEMOP:
+			ret = sys_semop (first, (struct sembuf *)ptr, second);
+			goto out;
+		case SEMGET:
+			ret = sys_semget (first, second, third);
+			goto out;
+		case SEMCTL: {
+			union semun fourth;
+			ret = -EINVAL;
+			if (!ptr)
+				goto out;
+			ret = -EFAULT;
+			if (get_user(fourth.__pad, (void **) ptr))
+				goto out;
+			ret = sys_semctl (first, second, third, fourth);
+			goto out;
+			}
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+	if (call <= MSGCTL) 
+		switch (call) {
+		case MSGSND:
+			ret = sys_msgsnd (first, (struct msgbuf *) ptr, 
+					  second, third);
+			goto out;
+		case MSGRCV:
+			switch (version) {
+			case 0: {
+				struct ipc_kludge tmp;
+				ret = -EINVAL;
+				if (!ptr)
+					goto out;
+				ret = -EFAULT;
+				if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
+						   sizeof (tmp)))
+					goto out;
+				ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
+				goto out;
+				}
+			case 1: default:
+				ret = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, third);
+				goto out;
+			}
+		case MSGGET:
+			ret = sys_msgget ((key_t) first, second);
+			goto out;
+		case MSGCTL:
+			ret = sys_msgctl (first, second, (struct msqid_ds *) ptr);
+			goto out;
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+	if (call <= SHMCTL) 
+		switch (call) {
+		case SHMAT:
+			switch (version) {
+			case 0: default: {
+				ulong raddr;
+				ret = sys_shmat (first, (char *) ptr, second, &raddr);
+				if (ret)
+					goto out;
+				ret = put_user (raddr, (ulong *) third);
+				goto out;
+				}
+			case 1:	/* iBCS2 emulator entry point */
+				ret = -EINVAL;
+				if (!segment_eq(get_fs(), get_ds()))
+					goto out;
+				ret = sys_shmat (first, (char *) ptr, second, (ulong *) third);
+				goto out;
+			}
+		case SHMDT: 
+			ret = sys_shmdt ((char *)ptr);
+			goto out;
+		case SHMGET:
+			ret = sys_shmget (first, second, third);
+			goto out;
+		case SHMCTL:
+			ret = sys_shmctl (first, second, (struct shmid_ds *) ptr);
+			goto out;
+		default:
+			ret = -EINVAL;
+			goto out;
+		}
+	else
+		ret = -EINVAL;
+out:
+	unlock_kernel();
+	return ret;
+}
+
+/* Fork a new task - this creates a new program thread.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage int sys_fork(struct pt_regs *regs)
+{
+	int ret;
+
+	lock_kernel();
+	ret = do_fork(SIGCHLD, regs->ARM_sp, regs);
+	unlock_kernel();
+
+	return ret;
+}
+
+/* Clone a task - this clones the calling program thread.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
+{
+	int ret;
+
+	lock_kernel();
+	if (!newsp)
+		newsp = regs->ARM_sp;
+
+	ret = do_fork(clone_flags, newsp, regs);
+	unlock_kernel();
+	return ret;
+}
+
+/* sys_execve() executes a new program.
+ * This is called indirectly via a small wrapper
+ */
+asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
+{
+	int error;
+	char * filename;
+
+	lock_kernel();
+	filename = getname(filenamei);
+	error = PTR_ERR(filename);
+	if (IS_ERR(filename))
+		goto out;
+	error = do_execve(filename, argv, envp, regs);
+	putname(filename);
+out:
+	unlock_kernel();
+	return error;
+}
+
+/*
+ * Detect the old function calling standard
+ */
+static inline unsigned long old_calling_standard (struct pt_regs  *regs)
+{
+	unsigned long instr, *pcv = (unsigned long *)(instruction_pointer(regs) - 8);
+	return (!get_user (instr, pcv) && instr == 0xe1a0300d);
+}
+
+/* Compatability functions - we used to pass 5 parameters as r0, r1, r2, *r3, *(r3+4)
+ * We now use r0 - r4, and return an error if the old style calling standard is used.
+ * Eventually these functions will disappear.
+ */
+asmlinkage int
+sys_compat_llseek (unsigned int fd, unsigned long offset_high, unsigned long offset_low,
+		loff_t *result, unsigned int origin, struct pt_regs *regs)
+{
+	extern int sys_llseek (unsigned int, unsigned long, unsigned long, loff_t *, unsigned int);
+
+	if (old_calling_standard (regs)) {
+		printk (KERN_NOTICE "%s (%d): unsupported llseek call standard\n",
+			current->comm, current->pid);
+		return -EINVAL;
+	}
+	return sys_llseek (fd, offset_high, offset_low, result, origin);
+}
+
+asmlinkage int
+sys_compat_mount (char *devname, char *dirname, char *type, unsigned long flags, void *data,
+		  struct pt_regs *regs)
+{
+	extern int sys_mount (char *, char *, char *, unsigned long, void *);
+
+	if (old_calling_standard (regs)) {
+		printk (KERN_NOTICE "%s (%d): unsupported mount call standard\n",
+			current->comm, current->pid);
+		return -EINVAL;
+	}
+	return sys_mount (devname, dirname, type, flags, data);
+}
+
+asmlinkage int sys_uname (struct old_utsname * name)
+{
+	static int warned = 0;
+
+	if (warned == 0) {
+		warned ++;
+		printk (KERN_NOTICE "%s (%d): obsolete uname call\n",
+			current->comm, current->pid);
+	}
+
+	if (name && !copy_to_user (name, &system_utsname, sizeof (*name)))
+		return 0;
+	return -EFAULT;
+}
+
+asmlinkage int sys_olduname(struct oldold_utsname * name)
+{
+	int error;
+	static int warned = 0;
+
+	if (warned == 0) {
+		warned ++;
+		printk (KERN_NOTICE "%s (%d): obsolete olduname call\n",
+			current->comm, current->pid);
+	}
+
+	if (!name)
+		return -EFAULT;
+
+	if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
+		return -EFAULT;
+
+	error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
+	error -= __put_user(0,name->sysname+__OLD_UTS_LEN);
+	error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
+	error -= __put_user(0,name->nodename+__OLD_UTS_LEN);
+	error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN);
+	error -= __put_user(0,name->release+__OLD_UTS_LEN);
+	error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN);
+	error -= __put_user(0,name->version+__OLD_UTS_LEN);
+	error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
+	error -= __put_user(0,name->machine+__OLD_UTS_LEN);
+	error = error ? -EFAULT : 0;
+
+	return error;
+}
+
+asmlinkage int sys_pause(void)
+{
+	static int warned = 0;
+
+	if (warned == 0) {
+		warned ++;
+		printk (KERN_NOTICE "%s (%d): obsolete pause call\n",
+			current->comm, current->pid);
+	}
+
+	current->state = TASK_INTERRUPTIBLE;
+	schedule();
+	return -ERESTARTNOHAND;
+}
+