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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_COMPAT_H
#define _ASM_X86_COMPAT_H
* Architecture specific compatibility types
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <asm/processor.h>
#include <asm/user32.h>
#include <asm/unistd.h>
#include <asm-generic/compat.h>
#define COMPAT_USER_HZ 100
#define COMPAT_UTS_MACHINE "i686\0\0"
typedef u16 __compat_uid_t;
typedef u16 __compat_gid_t;
typedef u32 __compat_uid32_t;
typedef u32 __compat_gid32_t;
typedef u16 compat_mode_t;
typedef u16 compat_dev_t;
typedef u16 compat_nlink_t;
typedef u16 compat_ipc_pid_t;
typedef u32 compat_caddr_t;
typedef __kernel_fsid_t compat_fsid_t;
typedef s64 __attribute__((aligned(4))) compat_s64;
typedef u64 __attribute__((aligned(4))) compat_u64;
struct compat_stat {
compat_dev_t st_dev;
u16 __pad1;
compat_ino_t st_ino;
compat_mode_t st_mode;
compat_nlink_t st_nlink;
__compat_uid_t st_uid;
__compat_gid_t st_gid;
compat_dev_t st_rdev;
u16 __pad2;
u32 st_size;
u32 st_blksize;
u32 st_blocks;
u32 st_atime;
u32 st_atime_nsec;
u32 st_mtime;
u32 st_mtime_nsec;
u32 st_ctime;
u32 st_ctime_nsec;
u32 __unused4;
u32 __unused5;
struct compat_flock {
short l_type;
short l_whence;
compat_off_t l_start;
compat_off_t l_len;
compat_pid_t l_pid;
#define F_GETLK64 12 /* using 'struct flock64' */
#define F_SETLK64 13
#define F_SETLKW64 14
* IA32 uses 4 byte alignment for 64 bit quantities,
* so we need to pack this structure.
struct compat_flock64 {
short l_type;
short l_whence;
compat_loff_t l_start;
compat_loff_t l_len;
compat_pid_t l_pid;
} __attribute__((packed));
struct compat_statfs {
int f_type;
int f_bsize;
int f_blocks;
int f_bfree;
int f_bavail;
int f_files;
int f_ffree;
compat_fsid_t f_fsid;
int f_namelen; /* SunOS ignores this field. */
int f_frsize;
int f_flags;
int f_spare[4];
#define COMPAT_RLIM_INFINITY 0xffffffff
typedef u32 compat_old_sigset_t; /* at least 32 bits */
#define _COMPAT_NSIG 64
#define _COMPAT_NSIG_BPW 32
typedef u32 compat_sigset_word;
#define COMPAT_OFF_T_MAX 0x7fffffff
struct compat_ipc64_perm {
compat_key_t key;
__compat_uid32_t uid;
__compat_gid32_t gid;
__compat_uid32_t cuid;
__compat_gid32_t cgid;
unsigned short mode;
unsigned short __pad1;
unsigned short seq;
unsigned short __pad2;
compat_ulong_t unused1;
compat_ulong_t unused2;
struct compat_semid64_ds {
struct compat_ipc64_perm sem_perm;
compat_ulong_t sem_otime;
compat_ulong_t sem_otime_high;
compat_ulong_t sem_ctime;
compat_ulong_t sem_ctime_high;
compat_ulong_t sem_nsems;
compat_ulong_t __unused3;
compat_ulong_t __unused4;
struct compat_msqid64_ds {
struct compat_ipc64_perm msg_perm;
compat_ulong_t msg_stime;
compat_ulong_t msg_stime_high;
compat_ulong_t msg_rtime;
compat_ulong_t msg_rtime_high;
compat_ulong_t msg_ctime;
compat_ulong_t msg_ctime_high;
compat_ulong_t msg_cbytes;
compat_ulong_t msg_qnum;
compat_ulong_t msg_qbytes;
compat_pid_t msg_lspid;
compat_pid_t msg_lrpid;
compat_ulong_t __unused4;
compat_ulong_t __unused5;
struct compat_shmid64_ds {
struct compat_ipc64_perm shm_perm;
compat_size_t shm_segsz;
compat_ulong_t shm_atime;
compat_ulong_t shm_atime_high;
compat_ulong_t shm_dtime;
compat_ulong_t shm_dtime_high;
compat_ulong_t shm_ctime;
compat_ulong_t shm_ctime_high;
compat_pid_t shm_cpid;
compat_pid_t shm_lpid;
compat_ulong_t shm_nattch;
compat_ulong_t __unused4;
compat_ulong_t __unused5;
* The type of struct elf_prstatus.pr_reg in compatible core dumps.
typedef struct user_regs_struct compat_elf_gregset_t;
/* Full regset -- prstatus on x32, otherwise on ia32 */
#define PRSTATUS_SIZE(S, R) (R != sizeof(S.pr_reg) ? 144 : 296)
#define SET_PR_FPVALID(S, V, R) \
do { *(int *) (((void *) &((S)->pr_reg)) + R) = (V); } \
while (0)
#ifdef CONFIG_X86_X32_ABI
(!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
* A pointer passed in from user mode. This should not
* be used for syscall parameters, just declare them
* as pointers because the syscall entry code will have
* appropriately converted them already.
static inline void __user *compat_ptr(compat_uptr_t uptr)
return (void __user *)(unsigned long)uptr;
static inline compat_uptr_t ptr_to_compat(void __user *uptr)
return (u32)(unsigned long)uptr;
static inline void __user *arch_compat_alloc_user_space(long len)
compat_uptr_t sp;
if (test_thread_flag(TIF_IA32)) {
sp = task_pt_regs(current)->sp;
} else {
/* -128 for the x32 ABI redzone */
sp = task_pt_regs(current)->sp - 128;
return (void __user *)round_down(sp - len, 16);
static inline bool in_x32_syscall(void)
#ifdef CONFIG_X86_X32_ABI
if (task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT)
return true;
return false;
static inline bool in_32bit_syscall(void)
return in_ia32_syscall() || in_x32_syscall();
static inline bool in_compat_syscall(void)
return in_32bit_syscall();
#define in_compat_syscall in_compat_syscall /* override the generic impl */
struct compat_siginfo;
int __copy_siginfo_to_user32(struct compat_siginfo __user *to,
const kernel_siginfo_t *from, bool x32_ABI);
#endif /* _ASM_X86_COMPAT_H */