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
17 struct 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 */
28 struct 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 extern bool __ia32_enabled;
60
61 static __always_inline bool ia32_enabled(void)
62 {
63 return __ia32_enabled;
64 }
65
66 static inline void ia32_disable(void)
67 {
68 __ia32_enabled = false;
69 }
70
71 #else /* !CONFIG_IA32_EMULATION */
72
73 static __always_inline bool ia32_enabled(void)
74 {
75 return IS_ENABLED(CONFIG_X86_32);
76 }
77
78 static inline void ia32_disable(void) {}
79
80 #endif
81
82 static inline bool ia32_enabled_verbose(void)
83 {
84 bool enabled = ia32_enabled();
85
86 if (IS_ENABLED(CONFIG_IA32_EMULATION) && !enabled)
87 pr_notice_once("32-bit emulation disabled. You can reenable with ia32_emulation=on\n");
88
89 return enabled;
90 }
91
92 #endif /* _ASM_X86_IA32_H */
93
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