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
  20 asmlinkage long compat_sys_sigreturn(void);
  21 asmlinkage long compat_sys_rt_sigreturn(void);
  22
  23 COMPAT_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
  41 COMPAT_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  */
  55 COMPAT_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
  75 COMPAT_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
  81 COMPAT_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
  88 COMPAT_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
  94 COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
  95                        arg_u32p(length))
  96 {
  97         return ksys_ftruncate(fd, arg_u64(length));
  98 }
  99
 100 COMPAT_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
 106 COMPAT_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
 112 COMPAT_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
 119 COMPAT_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
 132 const 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 };