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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_IA32_H
#define _ASM_X86_IA32_H
#ifdef CONFIG_IA32_EMULATION
#include <linux/compat.h>
/*
* 32 bit structures for IA32 support.
*/
#include <uapi/asm/sigcontext.h>
/* signal.h */
struct ucontext_ia32 {
unsigned int uc_flags;
unsigned int uc_link;
compat_stack_t uc_stack;
struct sigcontext_32 uc_mcontext;
compat_sigset_t uc_sigmask; /* mask last for extensibility */
};
/* This matches struct stat64 in glibc2.2, hence the absolutely
* insane amounts of padding around dev_t's.
*/
struct stat64 {
unsigned long long st_dev;
unsigned char __pad0[4];
#define STAT64_HAS_BROKEN_ST_INO 1
unsigned int __st_ino;
unsigned int st_mode;
unsigned int st_nlink;
unsigned int st_uid;
unsigned int st_gid;
unsigned long long st_rdev;
unsigned char __pad3[4];
long long st_size;
unsigned int st_blksize;
long long st_blocks;/* Number 512-byte blocks allocated */
unsigned st_atime;
unsigned st_atime_nsec;
unsigned st_mtime;
unsigned st_mtime_nsec;
unsigned st_ctime;
unsigned st_ctime_nsec;
unsigned long long st_ino;
} __attribute__((packed));
#define IA32_STACK_TOP IA32_PAGE_OFFSET
#ifdef __KERNEL__
struct linux_binprm;
extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
unsigned long stack_top, int exec_stack);
struct mm_struct;
extern void ia32_pick_mmap_layout(struct mm_struct *mm);
#endif
extern bool __ia32_enabled;
static __always_inline bool ia32_enabled(void)
{
return __ia32_enabled;
}
static inline void ia32_disable(void)
{
__ia32_enabled = false;
}
#else /* !CONFIG_IA32_EMULATION */
static __always_inline bool ia32_enabled(void)
{
return IS_ENABLED(CONFIG_X86_32);
}
static inline void ia32_disable(void) {}
#endif
static inline bool ia32_enabled_verbose(void)
{
bool enabled = ia32_enabled();
if (IS_ENABLED(CONFIG_IA32_EMULATION) && !enabled)
pr_notice_once("32-bit emulation disabled. You can reenable with ia32_emulation=on\n");
return enabled;
}
#endif /* _ASM_X86_IA32_H */
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