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 | #define IA32_STACK_TOP IA32_PAGE_OFFSET |
60 | |
61 | #ifdef __KERNEL__ |
62 | struct linux_binprm; |
63 | extern int ia32_setup_arg_pages(struct linux_binprm *bprm, |
64 | unsigned long stack_top, int exec_stack); |
65 | struct mm_struct; |
66 | extern void ia32_pick_mmap_layout(struct mm_struct *mm); |
67 | |
68 | #endif |
69 | |
70 | extern bool __ia32_enabled; |
71 | |
72 | static __always_inline bool ia32_enabled(void) |
73 | { |
74 | return __ia32_enabled; |
75 | } |
76 | |
77 | static inline void ia32_disable(void) |
78 | { |
79 | __ia32_enabled = false; |
80 | } |
81 | |
82 | #else /* !CONFIG_IA32_EMULATION */ |
83 | |
84 | static __always_inline bool ia32_enabled(void) |
85 | { |
86 | return IS_ENABLED(CONFIG_X86_32); |
87 | } |
88 | |
89 | static inline void ia32_disable(void) {} |
90 | |
91 | #endif |
92 | |
93 | static 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 | |