1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_IA32_H
3 #define _ASM_X86_IA32_H
5 #ifdef CONFIG_IA32_EMULATION
7 #include <linux/compat.h>
10 * 32 bit structures for IA32 support.
13 #include <uapi/asm/sigcontext.h>
17 struct ucontext_ia32 {
18 unsigned int uc_flags;
20 compat_stack_t uc_stack;
21 struct sigcontext_32 uc_mcontext;
22 compat_sigset_t uc_sigmask; /* mask last for extensibility */
25 /* This matches struct stat64 in glibc2.2, hence the absolutely
26 * insane amounts of padding around dev_t's.
29 unsigned long long st_dev;
30 unsigned char __pad0[4];
32 #define STAT64_HAS_BROKEN_ST_INO 1
33 unsigned int __st_ino;
36 unsigned int st_nlink;
41 unsigned long long st_rdev;
42 unsigned char __pad3[4];
45 unsigned int st_blksize;
47 long long st_blocks;/* Number 512-byte blocks allocated */
50 unsigned st_atime_nsec;
52 unsigned st_mtime_nsec;
54 unsigned st_ctime_nsec;
56 unsigned long long st_ino;
57 } __attribute__((packed));
59 #define IA32_STACK_TOP IA32_PAGE_OFFSET
63 extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
64 unsigned long stack_top, int exec_stack);
66 extern void ia32_pick_mmap_layout(struct mm_struct *mm);
70 extern bool __ia32_enabled;
72 static __always_inline bool ia32_enabled(void)
74 return __ia32_enabled;
77 static inline void ia32_disable(void)
79 __ia32_enabled = false;
82 #else /* !CONFIG_IA32_EMULATION */
84 static __always_inline bool ia32_enabled(void)
86 return IS_ENABLED(CONFIG_X86_32);
89 static inline void ia32_disable(void) {}
93 static inline bool ia32_enabled_verbose(void)
95 bool enabled = ia32_enabled();
97 if (IS_ENABLED(CONFIG_IA32_EMULATION) && !enabled)
98 pr_notice_once("32-bit emulation disabled. You can reenable with ia32_emulation=on\n");
103 #endif /* _ASM_X86_IA32_H */