LXR linux/arch/arm64/kernel/sys32.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * arch/arm64/kernel/sys32.c
   4 *
   5 * Copyright (C) 2015 ARM Ltd.
   6 */
   7
   8/*
   9 * Needed to avoid conflicting __NR_* macros between uapi/asm/unistd.h and
  10 * asm/unistd32.h.
  11 */
  12#define __COMPAT_SYSCALL_NR
  13
  14#include <linux/compat.h>
  15#include <linux/compiler.h>
  16#include <linux/syscalls.h>
  17
  18#include <asm/syscall.h>
  19
  20asmlinkage long compat_sys_sigreturn(void);
  21asmlinkage long compat_sys_rt_sigreturn(void);
  22
  23COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
  24                       compat_size_t, sz, struct compat_statfs64 __user *, buf)
  25{
  26        /*
  27         * 32-bit ARM applies an OABI compatibility fixup to statfs64 and
  28         * fstatfs64 regardless of whether OABI is in use, and therefore
  29         * arbitrary binaries may rely upon it, so we must do the same.
  30         * For more details, see commit:
  31         *
  32         * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and
  33         * fstatfs64")
  34         */
  35        if (sz == 88)
  36                sz = 84;
  37
  38        return kcompat_sys_statfs64(pathname, sz, buf);
  39}
  40
  41COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz,
  42                       struct compat_statfs64 __user *, buf)
  43{
  44        /* see aarch32_statfs64 */
  45        if (sz == 88)
  46                sz = 84;
  47
  48        return kcompat_sys_fstatfs64(fd, sz, buf);
  49}
  50
  51/*
  52 * Note: off_4k is always in units of 4K. If we can't do the
  53 * requested offset because it is not page-aligned, we return -EINVAL.
  54 */
  55COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len,
  56                       unsigned long, prot, unsigned long, flags,
  57                       unsigned long, fd, unsigned long, off_4k)
  58{
  59        if (off_4k & (~PAGE_MASK >> 12))
  60                return -EINVAL;
  61
  62        off_4k >>= (PAGE_SHIFT - 12);
  63
  64        return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k);
  65}
  66
  67#ifdef CONFIG_CPU_BIG_ENDIAN
  68#define arg_u32p(name)  u32, name##_hi, u32, name##_lo
  69#else
  70#define arg_u32p(name)  u32, name##_lo, u32, name##_hi
  71#endif
  72
  73#define arg_u64(name)   (((u64)name##_hi << 32) | name##_lo)
  74
  75COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf,
  76                       size_t, count, u32, __pad, arg_u32p(pos))
  77{
  78        return ksys_pread64(fd, buf, count, arg_u64(pos));
  79}
  80
  81COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd,
  82                       const char __user *, buf, size_t, count, u32, __pad,
  83                       arg_u32p(pos))
  84{
  85        return ksys_pwrite64(fd, buf, count, arg_u64(pos));
  86}
  87
  88COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
  89                       u32, __pad, arg_u32p(length))
  90{
  91        return ksys_truncate(pathname, arg_u64(length));
  92}
  93
  94COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
  95                       arg_u32p(length))
  96{
  97        return ksys_ftruncate(fd, arg_u64(length));
  98}
  99
 100COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,
 101                       arg_u32p(offset), size_t, count)
 102{
 103        return ksys_readahead(fd, arg_u64(offset), count);
 104}
 105
 106COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice,
 107                       arg_u32p(offset), arg_u32p(len))
 108{
 109        return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice);
 110}
 111
 112COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags,
 113                       arg_u32p(offset), arg_u32p(nbytes))
 114{
 115        return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes),
 116                                    flags);
 117}
 118
 119COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
 120                       arg_u32p(offset), arg_u32p(len))
 121{
 122        return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
 123}
 124
 125#undef __SYSCALL
 126#define __SYSCALL(nr, sym)      asmlinkage long __arm64_##sym(const struct pt_regs *);
 127#include <asm/unistd32.h>
 128
 129#undef __SYSCALL
 130#define __SYSCALL(nr, sym)      [nr] = __arm64_##sym,
 131
 132const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = {
 133        [0 ... __NR_compat_syscalls - 1] = __arm64_sys_ni_syscall,
 134#include <asm/unistd32.h>
 135};
 136