1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_IA32_H
3#define _ASM_X86_IA32_H
4
5#ifdef CONFIG_IA32_EMULATION
6
7#include <linux/compat.h>
8
9/*
10 * 32 bit structures for IA32 support.
11 */
12
13#include <uapi/asm/sigcontext.h>
14
15/* signal.h */
16
17struct ucontext_ia32 {
18	unsigned int	  uc_flags;
19	unsigned int 	  uc_link;
20	compat_stack_t	  uc_stack;
21	struct sigcontext_32 uc_mcontext;
22	compat_sigset_t	  uc_sigmask;	/* mask last for extensibility */
23};
24
25/* This matches struct stat64 in glibc2.2, hence the absolutely
26 * insane amounts of padding around dev_t's.
27 */
28struct stat64 {
29	unsigned long long	st_dev;
30	unsigned char		__pad0[4];
31
32#define STAT64_HAS_BROKEN_ST_INO	1
33	unsigned int		__st_ino;
34
35	unsigned int		st_mode;
36	unsigned int		st_nlink;
37
38	unsigned int		st_uid;
39	unsigned int		st_gid;
40
41	unsigned long long	st_rdev;
42	unsigned char		__pad3[4];
43
44	long long		st_size;
45	unsigned int		st_blksize;
46
47	long long		st_blocks;/* Number 512-byte blocks allocated */
48
49	unsigned 		st_atime;
50	unsigned 		st_atime_nsec;
51	unsigned 		st_mtime;
52	unsigned 		st_mtime_nsec;
53	unsigned 		st_ctime;
54	unsigned 		st_ctime_nsec;
55
56	unsigned long long	st_ino;
57} __attribute__((packed));
58
59#define IA32_STACK_TOP IA32_PAGE_OFFSET
60
61#ifdef __KERNEL__
62struct linux_binprm;
63extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
64				unsigned long stack_top, int exec_stack);
65struct mm_struct;
66extern void ia32_pick_mmap_layout(struct mm_struct *mm);
67
68#endif
69
70extern bool __ia32_enabled;
71
72static __always_inline bool ia32_enabled(void)
73{
74	return __ia32_enabled;
75}
76
77static inline void ia32_disable(void)
78{
79	__ia32_enabled = false;
80}
81
82#else /* !CONFIG_IA32_EMULATION */
83
84static __always_inline bool ia32_enabled(void)
85{
86	return IS_ENABLED(CONFIG_X86_32);
87}
88
89static inline void ia32_disable(void) {}
90
91#endif
92
93static inline bool ia32_enabled_verbose(void)
94{
95	bool enabled = ia32_enabled();
96
97	if (IS_ENABLED(CONFIG_IA32_EMULATION) && !enabled)
98		pr_notice_once("32-bit emulation disabled. You can reenable with ia32_emulation=on\n");
99
100	return enabled;
101}
102
103#endif /* _ASM_X86_IA32_H */
104