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
  53 SYSCALL_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
  59 SYSCALL_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
  65 SYSCALL_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
  76 SYSCALL_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
  82 SYSCALL_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
  88 SYSCALL_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
 102 asmlinkage 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
 108 asmlinkage 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
 118 asmlinkage 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
 128 asmlinkage 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 }