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