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};