LXR linux/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/module.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 <asm/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
  64SYSCALL_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        unsigned long error;
  69
  70        error = -EINVAL;
  71        if (pgoff & (~PAGE_MASK >> 12))
  72                goto out;
  73        error = sys_mmap_pgoff(addr, len, prot, flags, fd,
  74                               pgoff >> (PAGE_SHIFT-12));
  75out:
  76        return error;
  77}
  78
  79#define RLIM_INFINITY32 0x7fffffff
  80#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
  81
  82struct rlimit32 {
  83        int     rlim_cur;
  84        int     rlim_max;
  85};
  86
  87SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
  88        unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
  89{
  90        return sys_truncate(path, merge_64(a2, a3));
  91}
  92
  93SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
  94        unsigned long, a2, unsigned long, a3)
  95{
  96        return sys_ftruncate(fd, merge_64(a2, a3));
  97}
  98
  99SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
 100                unsigned int, offset_low, loff_t __user *, result,
 101                unsigned int, origin)
 102{
 103        return sys_llseek(fd, offset_high, offset_low, result, origin);
 104}
 105
 106/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
 107   lseek back to original location.  They fail just like lseek does on
 108   non-seekable files.  */
 109
 110SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
 111        unsigned long, unused, unsigned long, a4, unsigned long, a5)
 112{
 113        return sys_pread64(fd, buf, count, merge_64(a4, a5));
 114}
 115
 116SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
 117        size_t, count, u32, unused, u64, a4, u64, a5)
 118{
 119        return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
 120}
 121
 122SYSCALL_DEFINE1(32_personality, unsigned long, personality)
 123{
 124        unsigned int p = personality & 0xffffffff;
 125        int ret;
 126
 127        if (personality(current->personality) == PER_LINUX32 &&
 128            personality(p) == PER_LINUX)
 129                p = (p & ~PER_MASK) | PER_LINUX32;
 130        ret = sys_personality(p);
 131        if (ret != -1 && personality(ret) == PER_LINUX32)
 132                ret = (ret & ~PER_MASK) | PER_LINUX;
 133        return ret;
 134}
 135
 136asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
 137                                   size_t count)
 138{
 139        return sys_readahead(fd, merge_64(a2, a3), count);
 140}
 141
 142asmlinkage long sys32_sync_file_range(int fd, int __pad,
 143        unsigned long a2, unsigned long a3,
 144        unsigned long a4, unsigned long a5,
 145        int flags)
 146{
 147        return sys_sync_file_range(fd,
 148                        merge_64(a2, a3), merge_64(a4, a5),
 149                        flags);
 150}
 151
 152asmlinkage long sys32_fadvise64_64(int fd, int __pad,
 153        unsigned long a2, unsigned long a3,
 154        unsigned long a4, unsigned long a5,
 155        int flags)
 156{
 157        return sys_fadvise64_64(fd,
 158                        merge_64(a2, a3), merge_64(a4, a5),
 159                        flags);
 160}
 161
 162asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
 163        unsigned offset_a3, unsigned len_a4, unsigned len_a5)
 164{
 165        return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
 166                             merge_64(len_a4, len_a5));
 167}
 168