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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 (
* Derived from "arch/i386/kernel/sys_i386.c"
* Adapted from the i386 version by Gary Thomas
* Modified by Cort Dougan (
* and Paul Mackerras (
* 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>
#include <asm/asm-prototypes.h>
static inline 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);
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_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
ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct __kernel_old_timeval __user *tvp)
if ( (unsigned long)n >= 4096 )
return sys_old_select((void __user *)n);
return sys_select(n, inp, outp, exp, tvp);
#ifdef CONFIG_PPC64
long ppc64_personality(unsigned long personality)
long ret;
if (personality(current->personality) == PER_LINUX32
&& personality(personality) == PER_LINUX)
personality = (personality & ~PER_MASK) | PER_LINUX32;
ret = sys_personality(personality);
if (personality(ret) == PER_LINUX32)
ret = (ret & ~PER_MASK) | PER_LINUX;
return ret;
long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
u32 len_high, u32 len_low)
return ksys_fadvise64_64(fd, (u64)offset_high << 32 | offset_low,
(u64)len_high << 32 | len_low, advice);
struct thread_info *ti;
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;