compat.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ASM_X86_COMPAT_H
  3#define _ASM_X86_COMPAT_H
  4
  5/*
  6 * Architecture specific compatibility types
  7 */
  8#include <linux/types.h>
  9#include <linux/sched.h>
 10#include <linux/sched/task_stack.h>
 11#include <asm/processor.h>
 12#include <asm/user32.h>
 13#include <asm/unistd.h>
 14
 15#define compat_mode_t	compat_mode_t
 16typedef u16		compat_mode_t;
 17
 18#define __compat_uid_t	__compat_uid_t
 19typedef u16		__compat_uid_t;
 20typedef u16		__compat_gid_t;
 21
 22#define compat_dev_t	compat_dev_t
 23typedef u16		compat_dev_t;
 24
 25#define compat_ipc_pid_t compat_ipc_pid_t
 26typedef u16		 compat_ipc_pid_t;
 27
 28#define compat_statfs	compat_statfs
 29
 30#include <asm-generic/compat.h>
 31
 32#define COMPAT_UTS_MACHINE	"i686\0\0"
 33
 34typedef u16		compat_nlink_t;
 35
 36struct compat_stat {
 37	u32		st_dev;
 38	compat_ino_t	st_ino;
 39	compat_mode_t	st_mode;
 40	compat_nlink_t	st_nlink;
 41	__compat_uid_t	st_uid;
 42	__compat_gid_t	st_gid;
 43	u32		st_rdev;
 44	u32		st_size;
 45	u32		st_blksize;
 46	u32		st_blocks;
 47	u32		st_atime;
 48	u32		st_atime_nsec;
 49	u32		st_mtime;
 50	u32		st_mtime_nsec;
 51	u32		st_ctime;
 52	u32		st_ctime_nsec;
 53	u32		__unused4;
 54	u32		__unused5;
 55};
 56
 57/*
 58 * IA32 uses 4 byte alignment for 64 bit quantities, so we need to pack the
 59 * compat flock64 structure.
 60 */
 61#define __ARCH_NEED_COMPAT_FLOCK64_PACKED
 62
 63struct compat_statfs {
 64	int		f_type;
 65	int		f_bsize;
 66	int		f_blocks;
 67	int		f_bfree;
 68	int		f_bavail;
 69	int		f_files;
 70	int		f_ffree;
 71	compat_fsid_t	f_fsid;
 72	int		f_namelen;	/* SunOS ignores this field. */
 73	int		f_frsize;
 74	int		f_flags;
 75	int		f_spare[4];
 76};
 77
 78#ifdef CONFIG_X86_X32_ABI
 79#define COMPAT_USE_64BIT_TIME \
 80	(!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
 81#endif
 82
 83static inline bool in_x32_syscall(void)
 84{
 85#ifdef CONFIG_X86_X32_ABI
 86	if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
 87		return true;
 88#endif
 89	return false;
 90}
 91
 92static inline bool in_32bit_syscall(void)
 93{
 94	return in_ia32_syscall() || in_x32_syscall();
 95}
 96
 97#ifdef CONFIG_COMPAT
 98static inline bool in_compat_syscall(void)
 99{
100	return in_32bit_syscall();
101}
102#define in_compat_syscall in_compat_syscall	/* override the generic impl */
103#define compat_need_64bit_alignment_fixup in_ia32_syscall
104#endif
105
106struct compat_siginfo;
107
108#ifdef CONFIG_X86_X32_ABI
109int copy_siginfo_to_user32(struct compat_siginfo __user *to,
110		const kernel_siginfo_t *from);
111#define copy_siginfo_to_user32 copy_siginfo_to_user32
112#endif /* CONFIG_X86_X32_ABI */
113
114#endif /* _ASM_X86_COMPAT_H */