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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*/
#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/personality.h>
#include <linux/uaccess.h>
#include <asm/syscalls.h>
#include <asm/time.h>
#include <asm/unistd.h>
static long do_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long off, int shift)
{
if (!arch_validate_prot(prot, addr))
return -EINVAL;
if (!IS_ALIGNED(off, 1 << shift))
return -EINVAL;
return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift);
}
SYSCALL_DEFINE6(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);
}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE6(mmap2,
unsigned long, addr, size_t, len,
unsigned long, prot, unsigned long, flags,
unsigned long, fd, unsigned long, off_4k)
{
return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12);
}
#endif
SYSCALL_DEFINE6(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_PPC64
static long do_ppc64_personality(unsigned long personality)
{
long ret;
if (personality(current->personality) == PER_LINUX32
&& personality(personality) == PER_LINUX)
personality = (personality & ~PER_MASK) | PER_LINUX32;
ret = ksys_personality(personality);
if (personality(ret) == PER_LINUX32)
ret = (ret & ~PER_MASK) | PER_LINUX;
return ret;
}
SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
{
return do_ppc64_personality(personality);
}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
{
return do_ppc64_personality(personality);
}
#endif /* CONFIG_COMPAT */
#endif /* CONFIG_PPC64 */
SYSCALL_DEFINE6(ppc_fadvise64_64,
int, fd, int, advice, u32, offset_high, u32, offset_low,
u32, len_high, u32, len_low)
{
return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low),
merge_64(len_high, len_low), advice);
}
SYSCALL_DEFINE0(switch_endian)
{
struct thread_info *ti;
regs_set_return_msr(current->thread.regs,
current->thread.regs->msr ^ MSR_LE);
/*
* Set TIF_RESTOREALL so that r3 isn't clobbered on return to
* userspace. That also has the effect of restoring the non-volatile
* GPRs, so we saved them on the way in here.
*/
ti = current_thread_info();
ti->flags |= _TIF_RESTOREALL;
return 0;
}
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