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 /* Use this to get at 32-bit user passed pointers. */
  47 /* A() macro should be used for places where you e.g.
  48    have some internal variable u32 and just want to get
  49    rid of a compiler warning. AA() has to be used in
  50    places where you want to convert a function argument
  51    to 32bit pointer or when you e.g. access pt_regs
  52    structure and want to consider 32bit registers only.
  53  */
  54 #define A(__x) ((unsigned long)(__x))
  55 #define AA(__x) ((unsigned long)((int)__x))
  56
  57 #ifdef __MIPSEB__
  58 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  59 #endif
  60 #ifdef __MIPSEL__
  61 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  62 #endif
  63
  64 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
  65         unsigned long, prot, unsigned long, flags, unsigned long, fd,
  66         unsigned long, pgoff)
  67 {
  68         if (pgoff & (~PAGE_MASK >> 12))
  69                 return -EINVAL;
  70         return sys_mmap_pgoff(addr, len, prot, flags, fd,
  71                               pgoff >> (PAGE_SHIFT-12));
  72 }
  73
  74 #define RLIM_INFINITY32 0x7fffffff
  75 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
  76
  77 struct rlimit32 {
  78         int     rlim_cur;
  79         int     rlim_max;
  80 };
  81
  82 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
  83         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
  84 {
  85         return sys_truncate(path, merge_64(a2, a3));
  86 }
  87
  88 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
  89         unsigned long, a2, unsigned long, a3)
  90 {
  91         return sys_ftruncate(fd, merge_64(a2, a3));
  92 }
  93
  94 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
  95                 unsigned int, offset_low, loff_t __user *, result,
  96                 unsigned int, origin)
  97 {
  98         return sys_llseek(fd, offset_high, offset_low, result, origin);
  99 }
 100
 101 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 102    lseek back to original location.  They fail just like lseek does on
 103    non-seekable files.  */
 104
 105 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 106         unsigned long, unused, unsigned long, a4, unsigned long, a5)
 107 {
 108         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 109 }
 110
 111 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 112         size_t, count, u32, unused, u64, a4, u64, a5)
 113 {
 114         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 115 }
 116
 117 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 118 {
 119         unsigned int p = personality & 0xffffffff;
 120         int ret;
 121
 122         if (personality(current->personality) == PER_LINUX32 &&
 123             personality(p) == PER_LINUX)
 124                 p = (p & ~PER_MASK) | PER_LINUX32;
 125         ret = sys_personality(p);
 126         if (ret != -1 && personality(ret) == PER_LINUX32)
 127                 ret = (ret & ~PER_MASK) | PER_LINUX;
 128         return ret;
 129 }
 130
 131 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 132                                    size_t count)
 133 {
 134         return sys_readahead(fd, merge_64(a2, a3), count);
 135 }
 136
 137 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 138         unsigned long a2, unsigned long a3,
 139         unsigned long a4, unsigned long a5,
 140         int flags)
 141 {
 142         return sys_sync_file_range(fd,
 143                         merge_64(a2, a3), merge_64(a4, a5),
 144                         flags);
 145 }
 146
 147 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 148         unsigned long a2, unsigned long a3,
 149         unsigned long a4, unsigned long a5,
 150         int flags)
 151 {
 152         return sys_fadvise64_64(fd,
 153                         merge_64(a2, a3), merge_64(a4, a5),
 154                         flags);
 155 }
 156
 157 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 158         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 159 {
 160         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 161                              merge_64(len_a4, len_a5));
 162 }