LXR linux/arch/powerpc/kernel/sys

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
   4 *
   5 * Copyright (C) 2001 IBM
   6 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   8 *
   9 * These routines maintain argument size conversion between 32bit and 64bit
  10 * environment.
  11 */
  12
  13#include <linux/kernel.h>
  14#include <linux/sched.h>
  15#include <linux/fs.h> 
  16#include <linux/mm.h> 
  17#include <linux/file.h> 
  18#include <linux/signal.h>
  19#include <linux/resource.h>
  20#include <linux/times.h>
  21#include <linux/smp.h>
  22#include <linux/sem.h>
  23#include <linux/msg.h>
  24#include <linux/shm.h>
  25#include <linux/poll.h>
  26#include <linux/personality.h>
  27#include <linux/stat.h>
  28#include <linux/mman.h>
  29#include <linux/in.h>
  30#include <linux/syscalls.h>
  31#include <linux/unistd.h>
  32#include <linux/sysctl.h>
  33#include <linux/binfmts.h>
  34#include <linux/security.h>
  35#include <linux/compat.h>
  36#include <linux/ptrace.h>
  37#include <linux/elf.h>
  38#include <linux/ipc.h>
  39#include <linux/slab.h>
  40
  41#include <asm/ptrace.h>
  42#include <asm/types.h>
  43#include <linux/uaccess.h>
  44#include <asm/unistd.h>
  45#include <asm/time.h>
  46#include <asm/mmu_context.h>
  47#include <asm/ppc-pci.h>
  48#include <asm/syscalls.h>
  49#include <asm/switch_to.h>
  50
  51unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
  52                          unsigned long prot, unsigned long flags,
  53                          unsigned long fd, unsigned long pgoff)
  54{
  55        /* This should remain 12 even if PAGE_SIZE changes */
  56        return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
  57}
  58
  59/* 
  60 * long long munging:
  61 * The 32 bit ABI passes long longs in an odd even register pair.
  62 * High and low parts are swapped depending on endian mode,
  63 * so define a macro (similar to mips linux32) to handle that.
  64 */
  65#ifdef __LITTLE_ENDIAN__
  66#define merge_64(low, high) ((u64)high << 32) | low
  67#else
  68#define merge_64(high, low) ((u64)high << 32) | low
  69#endif
  70
  71compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
  72                             u32 reg6, u32 pos1, u32 pos2)
  73{
  74        return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
  75}
  76
  77compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
  78                              u32 reg6, u32 pos1, u32 pos2)
  79{
  80        return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
  81}
  82
  83compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count)
  84{
  85        return ksys_readahead(fd, merge_64(offset1, offset2), count);
  86}
  87
  88asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
  89                                unsigned long len1, unsigned long len2)
  90{
  91        return ksys_truncate(path, merge_64(len1, len2));
  92}
  93
  94asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offset1, u32 offset2,
  95                                     u32 len1, u32 len2)
  96{
  97        return ksys_fallocate(fd, mode, ((loff_t)offset1 << 32) | offset2,
  98                             merge_64(len1, len2));
  99}
 100
 101asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1,
 102                                 unsigned long len2)
 103{
 104        return ksys_ftruncate(fd, merge_64(len1, len2));
 105}
 106
 107long ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2,
 108                     size_t len, int advice)
 109{
 110        return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
 111                                 advice);
 112}
 113
 114asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
 115                                   unsigned offset1, unsigned offset2,
 116                                   unsigned nbytes1, unsigned nbytes2)
 117{
 118        loff_t offset = merge_64(offset1, offset2);
 119        loff_t nbytes = merge_64(nbytes1, nbytes2);
 120
 121        return ksys_sync_file_range(fd, offset, nbytes, flags);
 122}
 123