128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Implementation of various system calls for Linux/PowerPC
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*
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Derived from "arch/i386/kernel/sys_i386.c"
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* Adapted from the i386 version by Gary Thomas
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au).
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the Linux/PPC
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/syscalls.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/sys.h>
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#include <linux/ipc.h>
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#include <linux/utsname.h>
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#include <linux/file.h>
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#include <linux/personality.h>
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#include <linux/uaccess.h>
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#include <asm/syscalls.h>
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#include <asm/time.h>
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#include <asm/unistd.h>
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static long do_mmap2(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long off, int shift)
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{
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if (!arch_validate_prot(prot, addr))
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return -EINVAL;
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if (!IS_ALIGNED(off, 1 << shift))
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return -EINVAL;
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return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift);
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}
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SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, unsigned long, pgoff)
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{
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return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYSCALL_DEFINE6(mmap2,
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unsigned long, addr, size_t, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, unsigned long, off_4k)
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{
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return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12);
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}
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#endif
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SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len,
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unsigned long, prot, unsigned long, flags,
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unsigned long, fd, off_t, offset)
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{
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return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
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}
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#ifdef CONFIG_PPC64
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static long do_ppc64_personality(unsigned long personality)
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{
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long ret;
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if (personality(current->personality) == PER_LINUX32
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&& personality(personality) == PER_LINUX)
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personality = (personality & ~PER_MASK) | PER_LINUX32;
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ret = ksys_personality(personality);
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if (personality(ret) == PER_LINUX32)
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ret = (ret & ~PER_MASK) | PER_LINUX;
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return ret;
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}
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SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
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{
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return do_ppc64_personality(personality);
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality)
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{
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return do_ppc64_personality(personality);
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}
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#endif /* CONFIG_COMPAT */
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#endif /* CONFIG_PPC64 */
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SYSCALL_DEFINE6(ppc_fadvise64_64,
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int, fd, int, advice, u32, offset_high, u32, offset_low,
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u32, len_high, u32, len_low)
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{
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return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low),
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merge_64(len_high, len_low), advice);
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}
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SYSCALL_DEFINE0(switch_endian)
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{
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struct thread_info *ti;
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regs_set_return_msr(current->thread.regs,
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current->thread.regs->msr ^ MSR_LE);
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/*
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* Set TIF_RESTOREALL so that r3 isn't clobbered on return to
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* userspace. That also has the effect of restoring the non-volatile
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* GPRs, so we saved them on the way in here.
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*/
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ti = current_thread_info();
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ti->flags |= _TIF_RESTOREALL;
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return 0;
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}
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