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Power 6/32 Unix version 1.2b

/*
 * 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;	/* f.p. 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;
	int	pcb_sigc[4];
};

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; \
	}

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