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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * arch/arm64/kernel/sys32.c
- *
- * Copyright (C) 2015 ARM Ltd.
- */
- /*
- * Needed to avoid conflicting __NR_* macros between uapi/asm/unistd.h and
- * asm/unistd32.h.
- */
- #define __COMPAT_SYSCALL_NR
- #include <linux/compat.h>
- #include <linux/compiler.h>
- #include <linux/syscalls.h>
- #include <asm/syscall.h>
- asmlinkage long compat_sys_sigreturn(void);
- asmlinkage long compat_sys_rt_sigreturn(void);
- COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
- compat_size_t, sz, struct compat_statfs64 __user *, buf)
- {
- /*
- * 32-bit ARM applies an OABI compatibility fixup to statfs64 and
- * fstatfs64 regardless of whether OABI is in use, and therefore
- * arbitrary binaries may rely upon it, so we must do the same.
- * For more details, see commit:
- *
- * 713c481519f19df9 ("[ARM] 3108/2: old ABI compat: statfs64 and
- * fstatfs64")
- */
- if (sz == 88)
- sz = 84;
- return kcompat_sys_statfs64(pathname, sz, buf);
- }
- COMPAT_SYSCALL_DEFINE3(aarch32_fstatfs64, unsigned int, fd, compat_size_t, sz,
- struct compat_statfs64 __user *, buf)
- {
- /* see aarch32_statfs64 */
- if (sz == 88)
- sz = 84;
- return kcompat_sys_fstatfs64(fd, sz, buf);
- }
- /*
- * Note: off_4k is always in units of 4K. If we can't do the
- * requested offset because it is not page-aligned, we return -EINVAL.
- */
- COMPAT_SYSCALL_DEFINE6(aarch32_mmap2, unsigned long, addr, unsigned long, len,
- unsigned long, prot, unsigned long, flags,
- unsigned long, fd, unsigned long, off_4k)
- {
- if (off_4k & (~PAGE_MASK >> 12))
- return -EINVAL;
- off_4k >>= (PAGE_SHIFT - 12);
- return ksys_mmap_pgoff(addr, len, prot, flags, fd, off_4k);
- }
- #ifdef CONFIG_CPU_BIG_ENDIAN
- #define arg_u32p(name) u32, name##_hi, u32, name##_lo
- #else
- #define arg_u32p(name) u32, name##_lo, u32, name##_hi
- #endif
- #define arg_u64(name) (((u64)name##_hi << 32) | name##_lo)
- COMPAT_SYSCALL_DEFINE6(aarch32_pread64, unsigned int, fd, char __user *, buf,
- size_t, count, u32, __pad, arg_u32p(pos))
- {
- return ksys_pread64(fd, buf, count, arg_u64(pos));
- }
- COMPAT_SYSCALL_DEFINE6(aarch32_pwrite64, unsigned int, fd,
- const char __user *, buf, size_t, count, u32, __pad,
- arg_u32p(pos))
- {
- return ksys_pwrite64(fd, buf, count, arg_u64(pos));
- }
- COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
- u32, __pad, arg_u32p(length))
- {
- return ksys_truncate(pathname, arg_u64(length));
- }
- COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
- arg_u32p(length))
- {
- return ksys_ftruncate(fd, arg_u64(length));
- }
- COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,
- arg_u32p(offset), size_t, count)
- {
- return ksys_readahead(fd, arg_u64(offset), count);
- }
- COMPAT_SYSCALL_DEFINE6(aarch32_fadvise64_64, int, fd, int, advice,
- arg_u32p(offset), arg_u32p(len))
- {
- return ksys_fadvise64_64(fd, arg_u64(offset), arg_u64(len), advice);
- }
- COMPAT_SYSCALL_DEFINE6(aarch32_sync_file_range2, int, fd, unsigned int, flags,
- arg_u32p(offset), arg_u32p(nbytes))
- {
- return ksys_sync_file_range(fd, arg_u64(offset), arg_u64(nbytes),
- flags);
- }
- COMPAT_SYSCALL_DEFINE6(aarch32_fallocate, int, fd, int, mode,
- arg_u32p(offset), arg_u32p(len))
- {
- return ksys_fallocate(fd, mode, arg_u64(offset), arg_u64(len));
- }
- #undef __SYSCALL
- #define __SYSCALL(nr, sym) asmlinkage long __arm64_##sym(const struct pt_regs *);
- #include <asm/unistd32.h>
- #undef __SYSCALL
- #define __SYSCALL(nr, sym) [nr] = __arm64_##sym,
- const syscall_fn_t compat_sys_call_table[__NR_compat_syscalls] = {
- [0 ... __NR_compat_syscalls - 1] = __arm64_sys_ni_syscall,
- #include <asm/unistd32.h>
- };
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