sccsid

[unix-history] / usr / src / usr.bin / pascal / pdx / process / process.rep

/* Copyright (c) 1982 Regents of the University of California */

/* static char sccsid[] = "@(#)process.rep 1.2 %G%"; */

/*
 * This file defines the representation of a process.
 * It is MACHINE DEPENDENT.
 */

#define STOPPED 0177
#define FINISHED 0

#define NREG 12			/* maximum number of saved registers */
#define CSIZE 101		/* size of instruction cache */

/*
 * Cache-ing of instruction segment is done to reduce the number
 * of calls to ptrace.
 */

typedef struct {
	WORD addr;
	WORD val;
} CACHEWORD;

/*
 * This structure holds the information we need from the user structure.
 */

struct process {
	int pid;		/* process being traced */
	WORD reg[NREG];		/* process's registers */
	WORD ap, fp, sp, pc;	/* special registers */
	WORD oreg[NREG];	/* registers when process last stopped */
	WORD oap, ofp, osp, opc;/* special registers when process stopped */
	int status;		/* either STOPPED or FINISHED */
	int signo;		/* signal that stopped process */
	int exitval;		/* return value from exit() */
	long sigset;		/* bit array of traced signals */
	CACHEWORD word[CSIZE];	/* text segment cache */
};

/*
 * Process manipulation routines local to this module.
 */

pstart();			/* start up a process */
pcont();			/* continue execution */
pstep();			/* single step */
pio();				/* process memory move */
psigtrace();			/* catch/don't catch a signal */
unsetsigtraces();		/* don't catch any signals */

/*
 * These definitions are for the arguments to "pio".
 */

typedef enum { PREAD, PWRITE } PIO_OP;
typedef enum { TEXTSEG, DATASEG } PIO_SEG;