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 #include <linux/compat.h>
   9 #include <linux/compiler.h>
  10 #include <linux/syscalls.h>
  11
  12 #include <asm/syscall.h>
  13 #include <asm/unistd_compat_32.h>
  14
  15 asmlinkage long compat_sys_sigreturn(void);
  16 asmlinkage long compat_sys_rt_sigreturn(void);
  17
  18 COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
  19                        compat_size_t, sz, struct compat_statfs64 __user *, buf)
  20 {
  21         /*
  22          * 32-bit ARM applies an OABI compatibility fixup to statfs64 and
  23          * fstatfs64 regardless of whether OABI is in use, and therefore
  24          * arbitrary binaries may rely upon it, so we must do the same.
  25          * For more details, see commit:
  26          *
  27          * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and
  28          * fstatfs64")
  29          */
  30         if (sz == 88)
  31                 sz = 84;
  32
  33         return kcompat_sys_statfs64(pathname, sz, buf);
  34 }
  35
  36 COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz,
  37                        struct compat_statfs64 __user *, buf)
  38 {
  39         /* see aarch32_statfs64 */
  40         if (sz == 88)
  41                 sz = 84;
  42
  43         return kcompat_sys_fstatfs64(fd, sz, buf);
  44 }
  45
  46 /*
  47  * Note: off_4k is always in units of 4K. If we can't do the
  48  * requested offset because it is not page-aligned, we return -EINVAL.
  49  */
  50 COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len,
  51                        unsigned long, prot, unsigned long, flags,
  52                        unsigned long, fd, unsigned long, off_4k)
  53 {
  54         if (off_4k & (~PAGE_MASK >> 12))
  55                 return -EINVAL;
  56
  57         off_4k >>= (PAGE_SHIFT - 12);
  58
  59         return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k);
  60 }
  61
  62 #ifdef CONFIG_CPU_BIG_ENDIAN
  63 #define arg_u32p(name)  u32, name##_hi, u32, name##_lo
  64 #else
  65 #define arg_u32p(name)  u32, name##_lo, u32, name##_hi
  66 #endif
  67
  68 #define arg_u64(name)   (((u64)name##_hi << 32) | name##_lo)
  69
  70 COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf,
  71                        size_t, count, u32, __pad, arg_u32p(pos))
  72 {
  73         return ksys_pread64(fd, buf, count, arg_u64(pos));
  74 }
  75
  76 COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd,
  77                        const char __user *, buf, size_t, count, u32, __pad,
  78                        arg_u32p(pos))
  79 {
  80         return ksys_pwrite64(fd, buf, count, arg_u64(pos));
  81 }
  82
  83 COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
  84                        u32, __pad, arg_u32p(length))
  85 {
  86         return ksys_truncate(pathname, arg_u64(length));
  87 }
  88
  89 COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
  90                        arg_u32p(length))
  91 {
  92         return ksys_ftruncate(fd, arg_u64(length));
  93 }
  94
  95 COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,
  96                        arg_u32p(offset), size_t, count)
  97 {
  98         return ksys_readahead(fd, arg_u64(offset), count);
  99 }
 100
 101 COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice,
 102                        arg_u32p(offset), arg_u32p(len))
 103 {
 104         return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice);
 105 }
 106
 107 COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags,
 108                        arg_u32p(offset), arg_u32p(nbytes))
 109 {
 110         return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes),
 111                                     flags);
 112 }
 113
 114 COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
 115                        arg_u32p(offset), arg_u32p(len))
 116 {
 117         return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
 118 }
 119
 120 #define __SYSCALL_WITH_COMPAT(nr, sym, compat) __SYSCALL(nr, compat)
 121
 122 #undef __SYSCALL
 123 #define __SYSCALL(nr, sym)      asmlinkage long __arm64_##sym(const struct pt_regs *);
 124 #include <asm/syscall_table_32.h>
 125
 126 #undef __SYSCALL
 127 #define __SYSCALL(nr, sym)      [nr] = __arm64_##sym,
 128
 129 const syscall_fn_t compat_sys_call_table[__NR_compat32_syscalls] = {
 130         [0 ... __NR_compat32_syscalls - 1] = __arm64_sys_ni_syscall,
 131 #include <asm/syscall_table_32.h>
 132 };