arch/mips/kernel/linux32.c

   1 /*
   2  * Conversion between 32-bit and 64-bit native system calls.
   3  *
   4  * Copyright (C) 2000 Silicon Graphics, Inc.
   5  * Written by Ulf Carlsson (ulfc@engr.sgi.com)
   6  */
   7 #include <linux/compiler.h>
   8 #include <linux/mm.h>
   9 #include <linux/errno.h>
  10 #include <linux/file.h>
  11 #include <linux/highuid.h>
  12 #include <linux/resource.h>
  13 #include <linux/highmem.h>
  14 #include <linux/time.h>
  15 #include <linux/times.h>
  16 #include <linux/poll.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/filter.h>
  19 #include <linux/shm.h>
  20 #include <linux/sem.h>
  21 #include <linux/msg.h>
  22 #include <linux/icmpv6.h>
  23 #include <linux/syscalls.h>
  24 #include <linux/sysctl.h>
  25 #include <linux/utime.h>
  26 #include <linux/utsname.h>
  27 #include <linux/personality.h>
  28 #include <linux/dnotify.h>
  29 #include <linux/binfmts.h>
  30 #include <linux/security.h>
  31 #include <linux/compat.h>
  32 #include <linux/vfs.h>
  33 #include <linux/ipc.h>
  34 #include <linux/slab.h>
  35
  36 #include <net/sock.h>
  37 #include <net/scm.h>
  38
  39 #include <asm/compat-signal.h>
  40 #include <asm/sim.h>
  41 #include <linux/uaccess.h>
  42 #include <asm/mmu_context.h>
  43 #include <asm/mman.h>
  44
  45 /* Use this to get at 32-bit user passed pointers. */
  46 /* A() macro should be used for places where you e.g.
  47    have some internal variable u32 and just want to get
  48    rid of a compiler warning. AA() has to be used in
  49    places where you want to convert a function argument
  50    to 32bit pointer or when you e.g. access pt_regs
  51    structure and want to consider 32bit registers only.
  52  */
  53 #define A(__x) ((unsigned long)(__x))
  54 #define AA(__x) ((unsigned long)((int)__x))
  55
  56 #ifdef __MIPSEB__
  57 #define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
  58 #endif
  59 #ifdef __MIPSEL__
  60 #define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
  61 #endif
  62
  63 SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
  64         unsigned long, prot, unsigned long, flags, unsigned long, fd,
  65         unsigned long, pgoff)
  66 {
  67         unsigned long error;
  68
  69         error = -EINVAL;
  70         if (pgoff & (~PAGE_MASK >> 12))
  71                 goto out;
  72         error = sys_mmap_pgoff(addr, len, prot, flags, fd,
  73                                pgoff >> (PAGE_SHIFT-12));
  74 out:
  75         return error;
  76 }
  77
  78 #define RLIM_INFINITY32 0x7fffffff
  79 #define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
  80
  81 struct rlimit32 {
  82         int     rlim_cur;
  83         int     rlim_max;
  84 };
  85
  86 SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
  87         unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
  88 {
  89         return sys_truncate(path, merge_64(a2, a3));
  90 }
  91
  92 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
  93         unsigned long, a2, unsigned long, a3)
  94 {
  95         return sys_ftruncate(fd, merge_64(a2, a3));
  96 }
  97
  98 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
  99                 unsigned int, offset_low, loff_t __user *, result,
 100                 unsigned int, origin)
 101 {
 102         return sys_llseek(fd, offset_high, offset_low, result, origin);
 103 }
 104
 105 /* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 106    lseek back to original location.  They fail just like lseek does on
 107    non-seekable files.  */
 108
 109 SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 110         unsigned long, unused, unsigned long, a4, unsigned long, a5)
 111 {
 112         return sys_pread64(fd, buf, count, merge_64(a4, a5));
 113 }
 114
 115 SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 116         size_t, count, u32, unused, u64, a4, u64, a5)
 117 {
 118         return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 119 }
 120
 121 SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 122 {
 123         unsigned int p = personality & 0xffffffff;
 124         int ret;
 125
 126         if (personality(current->personality) == PER_LINUX32 &&
 127             personality(p) == PER_LINUX)
 128                 p = (p & ~PER_MASK) | PER_LINUX32;
 129         ret = sys_personality(p);
 130         if (ret != -1 && personality(ret) == PER_LINUX32)
 131                 ret = (ret & ~PER_MASK) | PER_LINUX;
 132         return ret;
 133 }
 134
 135 asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 136                                    size_t count)
 137 {
 138         return sys_readahead(fd, merge_64(a2, a3), count);
 139 }
 140
 141 asmlinkage long sys32_sync_file_range(int fd, int __pad,
 142         unsigned long a2, unsigned long a3,
 143         unsigned long a4, unsigned long a5,
 144         int flags)
 145 {
 146         return sys_sync_file_range(fd,
 147                         merge_64(a2, a3), merge_64(a4, a5),
 148                         flags);
 149 }
 150
 151 asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 152         unsigned long a2, unsigned long a3,
 153         unsigned long a4, unsigned long a5,
 154         int flags)
 155 {
 156         return sys_fadvise64_64(fd,
 157                         merge_64(a2, a3), merge_64(a4, a5),
 158                         flags);
 159 }
 160
 161 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 162         unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 163 {
 164         return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 165                              merge_64(len_a4, len_a5));
 166 }