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 #include <asm/syscalls.h>
  46
  47 #ifdef __MIPSEB__
  48 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  49 #endif
  50 #ifdef __MIPSEL__
  51 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  52 #endif
  53
  54 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
  55         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
  56 {
  57         return ksys_truncate(path, merge_64(a2, a3));
  58 }
  59
  60 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
  61         unsigned long, a2, unsigned long, a3)
  62 {
  63         return ksys_ftruncate(fd, merge_64(a2, a3));
  64 }
  65
  66 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
  67                 unsigned int, offset_low, loff_t __user *, result,
  68                 unsigned int, origin)
  69 {
  70         return sys_llseek(fd, offset_high, offset_low, result, origin);
  71 }
  72
  73 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
  74    lseek back to original location.  They fail just like lseek does on
  75    non-seekable files.  */
  76
  77 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
  78         unsigned long, unused, unsigned long, a4, unsigned long, a5)
  79 {
  80         return ksys_pread64(fd, buf, count, merge_64(a4, a5));
  81 }
  82
  83 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
  84         size_t, count, u32, unused, u64, a4, u64, a5)
  85 {
  86         return ksys_pwrite64(fd, buf, count, merge_64(a4, a5));
  87 }
  88
  89 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
  90 {
  91         unsigned int p = personality & 0xffffffff;
  92         int ret;
  93
  94         if (personality(current->personality) == PER_LINUX32 &&
  95             personality(p) == PER_LINUX)
  96                 p = (p & ~PER_MASK) | PER_LINUX32;
  97         ret = sys_personality(p);
  98         if (ret != -1 && personality(ret) == PER_LINUX32)
  99                 ret = (ret & ~PER_MASK) | PER_LINUX;
 100         return ret;
 101 }
 102
 103 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 104                                    size_t count)
 105 {
 106         return ksys_readahead(fd, merge_64(a2, a3), count);
 107 }
 108
 109 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 110         unsigned long a2, unsigned long a3,
 111         unsigned long a4, unsigned long a5,
 112         int flags)
 113 {
 114         return ksys_sync_file_range(fd,
 115                         merge_64(a2, a3), merge_64(a4, a5),
 116                         flags);
 117 }
 118
 119 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 120         unsigned long a2, unsigned long a3,
 121         unsigned long a4, unsigned long a5,
 122         int flags)
 123 {
 124         return ksys_fadvise64_64(fd,
 125                         merge_64(a2, a3), merge_64(a4, a5),
 126                         flags);
 127 }
 128
 129 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 130         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 131 {
 132         return ksys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 133                               merge_64(len_a4, len_a5));
 134 }