usr/src/sys/i386/include/frame.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)frame.h     5.2 (Berkeley) %G%
 */

/*
 * System stack frames.
 */

/*
 * Exception/Trap Stack Frame
 */

struct trapframe {
        int     tf_es;
        int     tf_ds;
        int     tf_edi;
        int     tf_esi;
        int     tf_ebp;
        int     tf_isp;
        int     tf_ebx;
        int     tf_edx;
        int     tf_ecx;
        int     tf_eax;
        int     tf_trapno;
        /* below portion defined in 386 hardware */
        int     tf_err;
        int     tf_eip;
        int     tf_cs;
        int     tf_eflags;
        /* below only when transitting rings (e.g. user to kernel) */
        int     tf_esp;
        int     tf_ss;
};

/* Interrupt stack frame */

struct intrframe {
        int     if_vec;
        int     if_ppl;
        int     if_es;
        int     if_ds;
        int     if_edi;
        int     if_esi;
        int     if_ebp;
        int     :32;
        int     if_ebx;
        int     if_edx;
        int     if_ecx;
        int     if_eax;
        int     :32;            /* for compat with trap frame - trapno */
        int     :32;            /* for compat with trap frame - err */
        /* below portion defined in 386 hardware */
        int     if_eip;
        int     if_cs;
        int     if_eflags;
        /* below only when transitting rings (e.g. user to kernel) */
        int     if_esp;
        int     if_ss;
};

/*
 * Call Gate/System Call Stack Frame
 */

struct syscframe {
        int     sf_edi;
        int     sf_esi;
        int     sf_ebp;
        int     :32;            /* redundant save of isp */
        int     sf_ebx;
        int     sf_edx;
        int     sf_ecx;
        int     sf_eax;
        int     sf_eflags;
        /* below portion defined in 386 hardware */
/*      int     sf_args[N];     /* if call gate copy args enabled!*/
        int     sf_eip;
        int     sf_cs;
        /* below only when transitting rings (e.g. user to kernel) */
        int     sf_esp;
        int     sf_ss;
};