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;