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127 lines
3.3 KiB
127 lines
3.3 KiB
// 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 ([email protected]) |
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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 ([email protected]) |
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* and Paul Mackerras ([email protected]). |
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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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