root/arch/x86/include/asm/sigframe.h

#ifndef _ASM_X86_SIGFRAME_H
#define _ASM_X86_SIGFRAME_H

#include <asm/sigcontext.h>
#include <asm/siginfo.h>
#include <asm/ucontext.h>

#ifdef CONFIG_X86_32
#define sigframe_ia32           sigframe
#define rt_sigframe_ia32        rt_sigframe
#define sigcontext_ia32         sigcontext
#define _fpstate_ia32           _fpstate
#define ucontext_ia32           ucontext
#else /* !CONFIG_X86_32 */

#ifdef CONFIG_IA32_EMULATION
#include <asm/ia32.h>
#endif /* CONFIG_IA32_EMULATION */

#endif /* CONFIG_X86_32 */

#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
struct sigframe_ia32 {
        u32 pretcode;
        int sig;
        struct sigcontext_ia32 sc;
        /*
         * fpstate is unused. fpstate is moved/allocated after
         * retcode[] below. This movement allows to have the FP state and the
         * future state extensions (xsave) stay together.
         * And at the same time retaining the unused fpstate, prevents changing
         * the offset of extramask[] in the sigframe and thus prevent any
         * legacy application accessing/modifying it.
         */
        struct _fpstate_ia32 fpstate_unused;
#ifdef CONFIG_IA32_EMULATION
        unsigned int extramask[_COMPAT_NSIG_WORDS-1];
#else /* !CONFIG_IA32_EMULATION */
        unsigned long extramask[_NSIG_WORDS-1];
#endif /* CONFIG_IA32_EMULATION */
        char retcode[8];
        /* fp state follows here */
};

struct rt_sigframe_ia32 {
        u32 pretcode;
        int sig;
        u32 pinfo;
        u32 puc;
#ifdef CONFIG_IA32_EMULATION
        compat_siginfo_t info;
#else /* !CONFIG_IA32_EMULATION */
        struct siginfo info;
#endif /* CONFIG_IA32_EMULATION */
        struct ucontext_ia32 uc;
        char retcode[8];
        /* fp state follows here */
};
#endif /* defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) */

#ifdef CONFIG_X86_64

struct rt_sigframe {
        char __user *pretcode;
        struct ucontext uc;
        struct siginfo info;
        /* fp state follows here */
};

#ifdef CONFIG_X86_X32_ABI

struct rt_sigframe_x32 {
        u64 pretcode;
        struct ucontext_x32 uc;
        compat_siginfo_t info;
        /* fp state follows here */
};

#endif /* CONFIG_X86_X32_ABI */

#endif /* CONFIG_X86_64 */

#endif /* _ASM_X86_SIGFRAME_H */