1 files changed, 265 insertions, 0 deletions
diff --git a/arch/x86/kernel/sys_i386_32.c b/arch/x86/kernel/sys_i386_32.c
new file mode 100644
index 00000000000..42147304de8
--- /dev/null
+++ b/arch/x86/kernel/sys_i386_32.c
@@ -0,0 +1,265 @@
+/*
+ * linux/arch/i386/kernel/sys_i386.c
+ *
+ * This file contains various random system calls that
+ * have a non-standard calling sequence on the Linux/i386
+ * platform.
+ */
+
+#include <linux/errno.h>
+#include <linux/sched.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/syscalls.h>
+#include <linux/mman.h>
+#include <linux/file.h>
+#include <linux/utsname.h>
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+#include <asm/ipc.h>
+
+/*
+ * 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 __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;
+}
+
+asmlinkage long sys_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;
+	struct mm_struct *mm = current->mm;
+
+	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
+	if (!(flags & MAP_ANONYMOUS)) {
+		file = fget(fd);
+		if (!file)
+			goto out;
+	}
+
+	down_write(&mm->mmap_sem);
+	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
+	up_write(&mm->mmap_sem);
+
+	if (file)
+		fput(file);
+out:
+	return error;
+}
+
+/*
+ * Perform the select(nd, in, out, ex, tv) and mmap() system
+ * calls. Linux/i386 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 __user *arg)
+{
+	struct mmap_arg_struct a;
+	int err = -EFAULT;
+
+	if (copy_from_user(&a, arg, sizeof(a)))
+		goto out;
+
+	err = -EINVAL;
+	if (a.offset & ~PAGE_MASK)
+		goto out;
+
+	err = sys_mmap2(a.addr, a.len, a.prot, a.flags,
+			a.fd, a.offset >> PAGE_SHIFT);
+out:
+	return err;
+}
+
+
+struct sel_arg_struct {
+	unsigned long n;
+	fd_set __user *inp, *outp, *exp;
+	struct timeval __user *tvp;
+};
+
+asmlinkage int old_select(struct sel_arg_struct __user *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 __user *ptr, long fifth)
+{
+	int version, ret;
+
+	version = call >> 16; /* hack for backward compatibility */
+	call &= 0xffff;
+
+	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 * __user *) ptr))
+			return -EFAULT;
+		return sys_semctl (first, second, third, fourth);
+	}
+
+	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);
+
+	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;
+			/* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
+			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 -ENOSYS;
+	}
+}
+
+/*
+ * Old cruft
+ */
+asmlinkage int sys_uname(struct old_utsname __user * name)
+{
+	int err;
+	if (!name)
+		return -EFAULT;
+	down_read(&uts_sem);
+	err = copy_to_user(name, utsname(), sizeof (*name));
+	up_read(&uts_sem);
+	return err?-EFAULT:0;
+}
+
+asmlinkage int sys_olduname(struct oldold_utsname __user * name)
+{
+	int error;
+
+	if (!name)
+		return -EFAULT;
+	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 |= __put_user(0, name->machine + __OLD_UTS_LEN);
+	
+	up_read(&uts_sem);
+	
+	error = error ? -EFAULT : 0;
+
+	return error;
+}
+
+
+/*
+ * Do a system call from kernel instead of calling sys_execve so we
+ * end up with proper pt_regs.
+ */
+int kernel_execve(const char *filename, char *const argv[], char *const envp[])
+{
+	long __res;
+	asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
+	: "=a" (__res)
+	: "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
+	return __res;
+}