usr/src/sys/tahoe/include/pcb.h

/*      pcb.h   1.2     86/01/05        */

/*
 * TAHOE process control block
 */
struct pcb {
        int     pcb_ksp;        /* kernel stack pointer */
        int     pcb_usp;        /* user stack pointer */
        int     pcb_r0;
        int     pcb_r1;
        int     pcb_r2;
        int     pcb_r3;
        int     pcb_r4;
        int     pcb_r5;
        int     pcb_r6;
        int     pcb_r7;
        int     pcb_r8;
        int     pcb_r9;
        int     pcb_r10;
        int     pcb_r11;
        int     pcb_r12;
        int     pcb_r13;
#define pcb_fp pcb_r13
        int     pcb_pc;         /* program counter */
        int     pcb_psl;        /* program status longword */
        struct  pte *pcb_p0br;  /* seg 0 base register */
        int     pcb_p0lr;       /* seg 0 length register and astlevel */
        struct  pte *pcb_p1br;  /* seg 1 base register */
        int     pcb_p1lr;       /* seg 1 length register and pme */
        struct  pte *pcb_p2br;  /* seg 2 base register */
        int     pcb_p2lr;       /* seg 2 length register and pme */
        int     pcb_ach;        /* accumulator - high order longword */
        int     pcb_acl;        /* accumulator - low order longword */
#define ACH     pcb_ach
#define ACL     pcb_acl
        int     pcb_hfs;        /* fp status register */
/*
 * Software pcb (extension)
 */
        union {
                float   *faddr; /* address of single precision accumulator */
                double  *daddr; /* address of double precision accumulator */
        } pcb_savacc;
#define FSAVACC pcb_savacc.faddr
#define DSAVACC pcb_savacc.daddr
        int     pcb_szpt;       /* number of pages of user page table */
        int     pcb_cmap2;
        int     *pcb_sswap;
        long    pcb_sigc[5];    /* sigcode actually 19 bytes */
};

extern long     *user_psl;

#define aston() { \
        u.u_pcb.pcb_psl |= PSL_SFE; \
        if ((int)user_psl != 0) \
                *user_psl |= PSL_SFE; \
}

#define astoff() { \
        u.u_pcb.pcb_psl &= ~ PSL_SFE; \
        if ((int)user_psl != 0) \
                *user_psl &= ~PSL_SFE; \
}