1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Implementation of various system calls for Linux/PowerPC 4 * 5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 6 * 7 * Derived from "arch/i386/kernel/sys_i386.c" 8 * Adapted from the i386 version by Gary Thomas 9 * Modified by Cort Dougan (cort@cs.nmt.edu) 10 * and Paul Mackerras (paulus@cs.anu.edu.au). 11 * 12 * This file contains various random system calls that 13 * have a non-standard calling sequence on the Linux/PPC 14 * platform. 15 */ 16 17#include <linux/errno.h> 18#include <linux/sched.h> 19#include <linux/syscalls.h> 20#include <linux/mm.h> 21#include <linux/fs.h> 22#include <linux/smp.h> 23#include <linux/sem.h> 24#include <linux/msg.h> 25#include <linux/shm.h> 26#include <linux/stat.h> 27#include <linux/mman.h> 28#include <linux/sys.h> 29#include <linux/ipc.h> 30#include <linux/utsname.h> 31#include <linux/file.h> 32#include <linux/personality.h> 33 34#include <linux/uaccess.h> 35#include <asm/syscalls.h> 36#include <asm/time.h> 37#include <asm/unistd.h> 38 39static long do_mmap2(unsigned long addr, size_t len, 40 unsigned long prot, unsigned long flags, 41 unsigned long fd, unsigned long off, int shift) 42{ 43 if (!arch_validate_prot(prot, addr)) 44 return -EINVAL; 45 46 if (!IS_ALIGNED(off, 1 << shift)) 47 return -EINVAL; 48 49 return ksys_mmap_pgoff(addr, len, prot, flags, fd, off >> shift); 50} 51 52SYSCALL_DEFINE6(mmap2, unsigned long, addr, size_t, len, 53 unsigned long, prot, unsigned long, flags, 54 unsigned long, fd, unsigned long, pgoff) 55{ 56 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 57} 58 59#ifdef CONFIG_COMPAT 60COMPAT_SYSCALL_DEFINE6(mmap2, 61 unsigned long, addr, size_t, len, 62 unsigned long, prot, unsigned long, flags, 63 unsigned long, fd, unsigned long, off_4k) 64{ 65 return do_mmap2(addr, len, prot, flags, fd, off_4k, PAGE_SHIFT-12); 66} 67#endif 68 69SYSCALL_DEFINE6(mmap, unsigned long, addr, size_t, len, 70 unsigned long, prot, unsigned long, flags, 71 unsigned long, fd, off_t, offset) 72{ 73 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 74} 75 76#ifdef CONFIG_PPC64 77static long do_ppc64_personality(unsigned long personality) 78{ 79 long ret; 80 81 if (personality(current->personality) == PER_LINUX32 82 && personality(personality) == PER_LINUX) 83 personality = (personality & ~PER_MASK) | PER_LINUX32; 84 ret = ksys_personality(personality); 85 if (personality(ret) == PER_LINUX32) 86 ret = (ret & ~PER_MASK) | PER_LINUX; 87 return ret; 88} 89 90SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality) 91{ 92 return do_ppc64_personality(personality); 93} 94 95#ifdef CONFIG_COMPAT 96COMPAT_SYSCALL_DEFINE1(ppc64_personality, unsigned long, personality) 97{ 98 return do_ppc64_personality(personality); 99} 100#endif /* CONFIG_COMPAT */ 101#endif /* CONFIG_PPC64 */ 102 103SYSCALL_DEFINE6(ppc_fadvise64_64, 104 int, fd, int, advice, u32, offset_high, u32, offset_low, 105 u32, len_high, u32, len_low) 106{ 107 return ksys_fadvise64_64(fd, merge_64(offset_high, offset_low), 108 merge_64(len_high, len_low), advice); 109} 110 111SYSCALL_DEFINE0(switch_endian) 112{ 113 struct thread_info *ti; 114 115 regs_set_return_msr(current->thread.regs, 116 current->thread.regs->msr ^ MSR_LE); 117 118 /* 119 * Set TIF_RESTOREALL so that r3 isn't clobbered on return to 120 * userspace. That also has the effect of restoring the non-volatile 121 * GPRs, so we saved them on the way in here. 122 */ 123 ti = current_thread_info(); 124 ti->flags |= _TIF_RESTOREALL; 125 126 return 0; 127} 128