// SPDX-License-Identifier: GPL-2.0-only/* * arch/arm64/kernel/sys32.c * * Copyright (C) 2015 ARM Ltd. */ #include <linux/compat.h>#include <linux/compiler.h>#include <linux/syscalls.h> #include <asm/syscall.h>#include <asm/unistd_compat_32.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), FTRUNCATE_LFS);} 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));} #define __SYSCALL_WITH_COMPAT(nr, sym, compat) __SYSCALL(nr, compat) #undef __SYSCALL#define __SYSCALL(nr, sym)	asmlinkage long __arm64_##sym(const struct pt_regs *);#include <asm/syscall_table_32.h> #undef __SYSCALL#define __SYSCALL(nr, sym)	[nr] = __arm64_##sym, const syscall_fn_t compat_sys_call_table[__NR_compat32_syscalls] = {	[0 ... __NR_compat32_syscalls - 1] = __arm64_sys_ni_syscall,#include <asm/syscall_table_32.h>};