LXR linux/arch/mips/kernel/linux32.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Conversion between 32-bit and 64-bit native system calls.
   4 *
   5 * Copyright (C) 2000 Silicon Graphics, Inc.
   6 * Written by Ulf Carlsson (ulfc@engr.sgi.com)
   7 */
   8#include <linux/compiler.h>
   9#include <linux/mm.h>
  10#include <linux/errno.h>
  11#include <linux/file.h>
  12#include <linux/highuid.h>
  13#include <linux/resource.h>
  14#include <linux/highmem.h>
  15#include <linux/time.h>
  16#include <linux/times.h>
  17#include <linux/poll.h>
  18#include <linux/skbuff.h>
  19#include <linux/filter.h>
  20#include <linux/shm.h>
  21#include <linux/sem.h>
  22#include <linux/msg.h>
  23#include <linux/icmpv6.h>
  24#include <linux/syscalls.h>
  25#include <linux/sysctl.h>
  26#include <linux/utime.h>
  27#include <linux/utsname.h>
  28#include <linux/personality.h>
  29#include <linux/dnotify.h>
  30#include <linux/binfmts.h>
  31#include <linux/security.h>
  32#include <linux/compat.h>
  33#include <linux/vfs.h>
  34#include <linux/ipc.h>
  35#include <linux/slab.h>
  36
  37#include <net/sock.h>
  38#include <net/scm.h>
  39
  40#include <asm/compat-signal.h>
  41#include <asm/sim.h>
  42#include <linux/uaccess.h>
  43#include <asm/mmu_context.h>
  44#include <asm/mman.h>
  45
  46#ifdef __MIPSEB__
  47#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  48#endif
  49#ifdef __MIPSEL__
  50#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  51#endif
  52
  53SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
  54        unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
  55{
  56        return ksys_truncate(path, merge_64(a2, a3));
  57}
  58
  59SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
  60        unsigned long, a2, unsigned long, a3)
  61{
  62        return ksys_ftruncate(fd, merge_64(a2, a3));
  63}
  64
  65SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
  66                unsigned int, offset_low, loff_t __user *, result,
  67                unsigned int, origin)
  68{
  69        return sys_llseek(fd, offset_high, offset_low, result, origin);
  70}
  71
  72/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
  73   lseek back to original location.  They fail just like lseek does on
  74   non-seekable files.  */
  75
  76SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
  77        unsigned long, unused, unsigned long, a4, unsigned long, a5)
  78{
  79        return ksys_pread64(fd, buf, count, merge_64(a4, a5));
  80}
  81
  82SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
  83        size_t, count, u32, unused, u64, a4, u64, a5)
  84{
  85        return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
  86}
  87
  88SYSCALL_DEFINE1(32_personality, unsigned long, personality)
  89{
  90        unsigned int p = personality & 0xffffffff;
  91        int ret;
  92
  93        if (personality(current->personality) == PER_LINUX32 &&
  94            personality(p) == PER_LINUX)
  95                p = (p & ~PER_MASK) | PER_LINUX32;
  96        ret = sys_personality(p);
  97        if (ret != -1 && personality(ret) == PER_LINUX32)
  98                ret = (ret & ~PER_MASK) | PER_LINUX;
  99        return ret;
 100}
 101
 102asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 103                                   size_t count)
 104{
 105        return ksys_readahead(fd, merge_64(a2, a3), count);
 106}
 107
 108asmlinkage long sys32_sync_file_range(int fd, int __pad,
 109        unsigned long a2, unsigned long a3,
 110        unsigned long a4, unsigned long a5,
 111        int flags)
 112{
 113        return ksys_sync_file_range(fd,
 114                        merge_64(a2, a3), merge_64(a4, a5),
 115                        flags);
 116}
 117
 118asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 119        unsigned long a2, unsigned long a3,
 120        unsigned long a4, unsigned long a5,
 121        int flags)
 122{
 123        return ksys_fadvise64_64(fd,
 124                        merge_64(a2, a3), merge_64(a4, a5),
 125                        flags);
 126}
 127
 128asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 129        unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 130{
 131        return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 132                              merge_64(len_a4, len_a5));
 133}
 134