Merge branch 'master'

1 files changed, 358 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
new file mode 100644
index 000000000000..f72ced11212d
--- /dev/null
+++ b/arch/powerpc/kernel/syscalls.c
@@ -0,0 +1,358 @@
+/*
+ *  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/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/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/ipc.h>
+#include <asm/semaphore.h>
+#include <asm/time.h>
+#include <asm/unistd.h>
+
+extern unsigned long wall_jiffies;
+
+
+/*
+ * 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(&current->mm->mmap_sem);
+	ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
+	up_write(&current->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 *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, &system_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, &system_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, &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 |= override_machine(name->machine);
+	up_read(&uts_sem);
+
+	return error? -EFAULT: 0;
+}
+
+#ifdef CONFIG_PPC64
+time_t sys64_time(time_t __user * tloc)
+{
+	time_t secs;
+	time_t usecs;
+
+	long tb_delta = tb_ticks_since(tb_last_stamp);
+	tb_delta += (jiffies - wall_jiffies) * tb_ticks_per_jiffy;
+
+	secs  = xtime.tv_sec;  
+	usecs = (xtime.tv_nsec/1000) + tb_delta / tb_ticks_per_usec;
+	while (usecs >= USEC_PER_SEC) {
+		++secs;
+		usecs -= USEC_PER_SEC;
+	}
+
+	if (tloc) {
+		if (put_user(secs,tloc))
+			secs = -EFAULT;
+	}
+
+	return secs;
+}
+#endif
+
+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());
+}