arch/powerpc/kernel/syscalls.c - linux - Git at Google

 /*
  *  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/semaphore.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(&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 __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());
 }
	/*
	* 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/semaphore.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(&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 __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());
	}