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Annotation of 43BSDTahoe/ucb/pascal/pdx/process/start.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)start.c    5.2 (Berkeley) 4/7/87";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Begin execution.
        !            13:  *
        !            14:  * For px, pstart does a traced exec to read in px and then stop.  But we
        !            15:  * want control after px has read in the obj file and before it starts
        !            16:  * executing.  The zeroth argument to px tells it to give us control
        !            17:  * by sending itself a signal just prior to interpreting.
        !            18:  *
        !            19:  * We set a "END_BP" breakpoint at the end of the code so that the
        !            20:  * process data doesn't disappear after the program terminates.
        !            21:  */
        !            22: 
        !            23: #include "defs.h"
        !            24: #include <signal.h>
        !            25: #include "process.h"
        !            26: #include "machine.h"
        !            27: #include "main.h"
        !            28: #include "breakpoint.h"
        !            29: #include "source.h"
        !            30: #include "object.h"
        !            31: #include "mappings.h"
        !            32: #include "sym.h"
        !            33: #include "process.rep"
        !            34: 
        !            35: #include "pxinfo.h"
        !            36: 
        !            37: start(argv, infile, outfile)
        !            38: char **argv;
        !            39: char *infile, *outfile;
        !            40: {
        !            41:     char *cmd;
        !            42: 
        !            43:     setsigtrace();
        !            44:     cmd = "/usr/ucb/px";
        !            45:     pstart(process, cmd, argv, infile, outfile);
        !            46:     if (process->status == STOPPED) {
        !            47:        TRAPARGS *ap, t;
        !            48: 
        !            49:        pcont(process);
        !            50:        if (process->status != STOPPED) {
        !            51:            if (option('t')) {
        !            52:                quit(process->exitval);
        !            53:            } else {
        !            54:                panic("px exited with %d", process->exitval);
        !            55:            }
        !            56:        }
        !            57: #ifdef tahoe
        !            58:        dread(&ap, process->fp, sizeof(ap));
        !            59:        ap = (TRAPARGS *)((unsigned)ap - 4);
        !            60:        dread(&RETLOC, process->fp - 8, sizeof(RETLOC));
        !            61: #else
        !            62:        dread(&ap, process->fp + 2*sizeof(int), sizeof(ap));
        !            63: #endif
        !            64:        dread(&t, ap, sizeof(TRAPARGS));
        !            65: 
        !            66: #define NARGS 5
        !            67: #ifdef tahoe
        !            68: #      define STKNARGS (sizeof(int)*(NARGS+1))
        !            69: #      define NARGLOC  t.trp_removed
        !            70: #else
        !            71: #      define STKNARGS (NARGS)
        !            72: #      define NARGLOC  t.nargs
        !            73: #endif
        !            74:        if (NARGLOC != STKNARGS) {
        !            75:            if (option('t')) {
        !            76:                unsetsigtraces(process);
        !            77:                pcont(process);
        !            78:                quit(process->exitval);
        !            79:            } else {
        !            80:                panic("start: args out of sync");
        !            81:            }
        !            82:        }
        !            83:        DISPLAY = t.disp;
        !            84:        DP = t.dp;
        !            85:        ENDOFF = t.objstart;
        !            86:        PCADDRP = t.pcaddrp;
        !            87:        LOOPADDR = t.loopaddr;
        !            88:        pc = 0;
        !            89:        curfunc = program;
        !            90:        if (objsize != 0) {
        !            91:            addbp(lastaddr(), END_BP, NIL, NIL, NIL, 0);
        !            92:        }
        !            93:     }
        !            94: }
        !            95: 
        !            96: /*
        !            97:  * Note the termination of the program.  We do this so as to avoid
        !            98:  * having the process exit, which would make the values of variables
        !            99:  * inaccessible.
        !           100:  *
        !           101:  * Although the END_BP should really be deleted, it is taken
        !           102:  * care of by fixbps the next time the program runs.
        !           103:  */
        !           104: 
        !           105: endprogram()
        !           106: {
        !           107:     if (ss_variables) {
        !           108:        prvarnews();
        !           109:     }
        !           110:     printf("\nexecution completed\n");
        !           111:     curfunc = program;
        !           112:     skimsource(srcfilename(pc));
        !           113:     curline = lastlinenum;
        !           114:     erecover();
        !           115: }
        !           116: 
        !           117: /*
        !           118:  * set up what signals we want to trace
        !           119:  */
        !           120: 
        !           121: LOCAL setsigtrace()
        !           122: {
        !           123:     register PROCESS *p;
        !           124: 
        !           125:     p = process;
        !           126:     psigtrace(p, SIGINT, TRUE);
        !           127:     psigtrace(p, SIGTRAP, TRUE);
        !           128:     psigtrace(p, SIGIOT, TRUE);
        !           129:     psigtrace(p, SIGILL, TRUE);
        !           130:     psigtrace(p, SIGBUS, TRUE);
        !           131: }

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