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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_COMPAT_H
#define _LINUX_COMPAT_H
/*
 * These are the type definitions for the architecture specific
 * syscall compatibility layer.
 */

#include <linux/types.h>
#include <linux/time.h>

#include <linux/stat.h>
#include <linux/param.h>	/* for HZ */
#include <linux/sem.h>
#include <linux/socket.h>
#include <linux/if.h>
#include <linux/fs.h>
#include <linux/aio_abi.h>	/* for aio_context_t */
#include <linux/uaccess.h>
#include <linux/unistd.h>

#include <asm/compat.h>
#include <asm/siginfo.h>
#include <asm/signal.h>

#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
/*
 * It may be useful for an architecture to override the definitions of the
 * COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
 * to use a different calling convention for syscalls. To allow for that,
 + the prototypes for the compat_sys_*() functions below will *not* be included
 * if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
 */
#include <asm/syscall_wrapper.h>
#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */

#ifndef COMPAT_USE_64BIT_TIME
#define COMPAT_USE_64BIT_TIME 0
#endif

#ifndef __SC_DELOUSE
#define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
#endif

#ifndef COMPAT_SYSCALL_DEFINE0
#define COMPAT_SYSCALL_DEFINE0(name) \
	asmlinkage long compat_sys_##name(void); \
	ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
	asmlinkage long compat_sys_##name(void)
#endif /* COMPAT_SYSCALL_DEFINE0 */

#define COMPAT_SYSCALL_DEFINE1(name, ...) \
        COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
#define COMPAT_SYSCALL_DEFINE2(name, ...) \
	COMPAT_SYSCALL_DEFINEx(2, _##name, __VA_ARGS__)
#define COMPAT_SYSCALL_DEFINE3(name, ...) \
	COMPAT_SYSCALL_DEFINEx(3, _##name, __VA_ARGS__)
#define COMPAT_SYSCALL_DEFINE4(name, ...) \
	COMPAT_SYSCALL_DEFINEx(4, _##name, __VA_ARGS__)
#define COMPAT_SYSCALL_DEFINE5(name, ...) \
	COMPAT_SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
#define COMPAT_SYSCALL_DEFINE6(name, ...) \
	COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)

/*
 * The asmlinkage stub is aliased to a function named __se_compat_sys_*() which
 * sign-extends 32-bit ints to longs whenever needed. The actual work is
 * done within __do_compat_sys_*().
 */
#ifndef COMPAT_SYSCALL_DEFINEx
#define COMPAT_SYSCALL_DEFINEx(x, name, ...)					\
	__diag_push();								\
	__diag_ignore(GCC, 8, "-Wattribute-alias",				\
		      "Type aliasing is used to sanitize syscall arguments");\
	asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))	\
		__attribute__((alias(__stringify(__se_compat_sys##name))));	\
	ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO);				\
	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
	asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));	\
	asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))	\
	{									\
		long ret = __do_compat_sys##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__));\
		__MAP(x,__SC_TEST,__VA_ARGS__);					\
		return ret;							\
	}									\
	__diag_pop();								\
	static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))
#endif /* COMPAT_SYSCALL_DEFINEx */

struct compat_iovec {
	compat_uptr_t	iov_base;
	compat_size_t	iov_len;
};

#ifndef compat_user_stack_pointer
#define compat_user_stack_pointer() current_user_stack_pointer()
#endif
#ifndef compat_sigaltstack	/* we'll need that for MIPS */
typedef struct compat_sigaltstack {
	compat_uptr_t			ss_sp;
	int				ss_flags;
	compat_size_t			ss_size;
} compat_stack_t;
#endif
#ifndef COMPAT_MINSIGSTKSZ
#define COMPAT_MINSIGSTKSZ	MINSIGSTKSZ
#endif

#define compat_jiffies_to_clock_t(x)	\
		(((unsigned long)(x) * COMPAT_USER_HZ) / HZ)

typedef __compat_uid32_t	compat_uid_t;
typedef __compat_gid32_t	compat_gid_t;

struct compat_sel_arg_struct;
struct rusage;

struct old_itimerval32;

struct compat_tms {
	compat_clock_t		tms_utime;
	compat_clock_t		tms_stime;
	compat_clock_t		tms_cutime;
	compat_clock_t		tms_cstime;
};

#define _COMPAT_NSIG_WORDS	(_COMPAT_NSIG / _COMPAT_NSIG_BPW)

typedef struct {
	compat_sigset_word	sig[_COMPAT_NSIG_WORDS];
} compat_sigset_t;

int set_compat_user_sigmask(const compat_sigset_t __user *umask,
			    size_t sigsetsize);

struct compat_sigaction {
#ifndef __ARCH_HAS_IRIX_SIGACTION
	compat_uptr_t			sa_handler;
	compat_ulong_t			sa_flags;
#else
	compat_uint_t			sa_flags;
	compat_uptr_t			sa_handler;
#endif
#ifdef __ARCH_HAS_SA_RESTORER
	compat_uptr_t			sa_restorer;
#endif
	compat_sigset_t			sa_mask __packed;
};

typedef union compat_sigval {
	compat_int_t	sival_int;
	compat_uptr_t	sival_ptr;
} compat_sigval_t;

typedef struct compat_siginfo {
	int si_signo;
#ifndef __ARCH_HAS_SWAPPED_SIGINFO
	int si_errno;
	int si_code;
#else
	int si_code;
	int si_errno;
#endif

	union {
		int _pad[128/sizeof(int) - 3];

		/* kill() */
		struct {
			compat_pid_t _pid;	/* sender's pid */
			__compat_uid32_t _uid;	/* sender's uid */
		} _kill;

		/* POSIX.1b timers */
		struct {
			compat_timer_t _tid;	/* timer id */
			int _overrun;		/* overrun count */
			compat_sigval_t _sigval;	/* same as below */
		} _timer;

		/* POSIX.1b signals */
		struct {
			compat_pid_t _pid;	/* sender's pid */
			__compat_uid32_t _uid;	/* sender's uid */
			compat_sigval_t _sigval;
		} _rt;

		/* SIGCHLD */
		struct {
			compat_pid_t _pid;	/* which child */
			__compat_uid32_t _uid;	/* sender's uid */
			int _status;		/* exit code */
			compat_clock_t _utime;
			compat_clock_t _stime;
		} _sigchld;

#ifdef CONFIG_X86_X32_ABI
		/* SIGCHLD (x32 version) */
		struct {
			compat_pid_t _pid;	/* which child */
			__compat_uid32_t _uid;	/* sender's uid */
			int _status;		/* exit code */
			compat_s64 _utime;
			compat_s64 _stime;
		} _sigchld_x32;
#endif

		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS, SIGTRAP, SIGEMT */
		struct {
			compat_uptr_t _addr;	/* faulting insn/memory ref. */
#define __COMPAT_ADDR_BND_PKEY_PAD  (__alignof__(compat_uptr_t) < sizeof(short) ? \
				     sizeof(short) : __alignof__(compat_uptr_t))
			union {
				/* used on alpha and sparc */
				int _trapno;	/* TRAP # which caused the signal */
				/*
				 * used when si_code=BUS_MCEERR_AR or
				 * used when si_code=BUS_MCEERR_AO
				 */
				short int _addr_lsb;	/* Valid LSB of the reported address. */
				/* used when si_code=SEGV_BNDERR */
				struct {
					char _dummy_bnd[__COMPAT_ADDR_BND_PKEY_PAD];
					compat_uptr_t _lower;
					compat_uptr_t _upper;
				} _addr_bnd;
				/* used when si_code=SEGV_PKUERR */
				struct {
					char _dummy_pkey[__COMPAT_ADDR_BND_PKEY_PAD];
					u32 _pkey;
				} _addr_pkey;
				/* used when si_code=TRAP_PERF */
				struct {
					compat_ulong_t _data;
					u32 _type;
					u32 _flags;
				} _perf;
			};
		} _sigfault;

		/* SIGPOLL */
		struct {
			compat_long_t _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
			int _fd;
		} _sigpoll;

		struct {
			compat_uptr_t _call_addr; /* calling user insn */
			int _syscall;	/* triggering system call number */
			unsigned int _arch;	/* AUDIT_ARCH_* of syscall */
		} _sigsys;
	} _sifields;
} compat_siginfo_t;

struct compat_rlimit {
	compat_ulong_t	rlim_cur;
	compat_ulong_t	rlim_max;
};

#ifdef __ARCH_NEED_COMPAT_FLOCK64_PACKED
#define __ARCH_COMPAT_FLOCK64_PACK	__attribute__((packed))
#else
#define __ARCH_COMPAT_FLOCK64_PACK
#endif

struct compat_flock {
	short			l_type;
	short			l_whence;
	compat_off_t		l_start;
	compat_off_t		l_len;
#ifdef __ARCH_COMPAT_FLOCK_EXTRA_SYSID
	__ARCH_COMPAT_FLOCK_EXTRA_SYSID
#endif
	compat_pid_t		l_pid;
#ifdef __ARCH_COMPAT_FLOCK_PAD
	__ARCH_COMPAT_FLOCK_PAD
#endif
};

struct compat_flock64 {
	short		l_type;
	short		l_whence;
	compat_loff_t	l_start;
	compat_loff_t	l_len;
	compat_pid_t	l_pid;
#ifdef __ARCH_COMPAT_FLOCK64_PAD
	__ARCH_COMPAT_FLOCK64_PAD
#endif
} __ARCH_COMPAT_FLOCK64_PACK;

struct compat_rusage {
	struct old_timeval32 ru_utime;
	struct old_timeval32 ru_stime;
	compat_long_t	ru_maxrss;
	compat_long_t	ru_ixrss;
	compat_long_t	ru_idrss;
	compat_long_t	ru_isrss;
	compat_long_t	ru_minflt;
	compat_long_t	ru_majflt;
	compat_long_t	ru_nswap;
	compat_long_t	ru_inblock;
	compat_long_t	ru_oublock;
	compat_long_t	ru_msgsnd;
	compat_long_t	ru_msgrcv;
	compat_long_t	ru_nsignals;
	compat_long_t	ru_nvcsw;
	compat_long_t	ru_nivcsw;
};

extern int put_compat_rusage(const struct rusage *,
			     struct compat_rusage __user *);

struct compat_siginfo;
struct __compat_aio_sigset;

struct compat_dirent {
	u32		d_ino;
	compat_off_t	d_off;
	u16		d