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