| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | |
| 3 | static char sccsid[] = "@(#)int.c 2.1 %G%"; |
| 4 | |
| 5 | /* |
| 6 | * px - interpreter for Berkeley Pascal |
| 7 | * Version 3.0 Winter 1979 |
| 8 | * |
| 9 | * Original version for the PDP 11/70 authored by: |
| 10 | * Bill Joy, Charles Haley, Ken Thompson |
| 11 | * |
| 12 | * Rewritten for VAX 11/780 by Kirk McKusick |
| 13 | */ |
| 14 | |
| 15 | #include <signal.h> |
| 16 | #include "whoami.h" |
| 17 | #include "vars.h" |
| 18 | #include "libpc.h" |
| 19 | #include "objfmt.h" |
| 20 | |
| 21 | /* |
| 22 | * New stuff for pdx |
| 23 | */ |
| 24 | |
| 25 | extern char *end; |
| 26 | extern loopaddr(); |
| 27 | union progcntr *pcaddrp; /* address of interpreter frame address */ |
| 28 | |
| 29 | main(ac,av) |
| 30 | |
| 31 | int ac; |
| 32 | char **av; |
| 33 | |
| 34 | { |
| 35 | register char *objprog, *file; |
| 36 | char *name; |
| 37 | register long bytesread, bytestoread, block; |
| 38 | register FILE *prog; |
| 39 | struct pxhdr pxhd; |
| 40 | # define pipe 3 |
| 41 | |
| 42 | /* |
| 43 | * Initialize everything |
| 44 | */ |
| 45 | _argc = ac; |
| 46 | _argv = av; |
| 47 | _nodump = FALSE; |
| 48 | \f |
| 49 | /* |
| 50 | * Determine how PX was invoked, and how to process the program |
| 51 | */ |
| 52 | file = _argv[1]; |
| 53 | if (!strcmp(_argv[0], "pdx")) { |
| 54 | _mode = PDX; |
| 55 | _argv += 2; _argc -= 2; |
| 56 | name = _argv[0]; |
| 57 | } else if (!strcmp(_argv[0], "pix")) { |
| 58 | _mode = PIX; |
| 59 | _argv++; _argc--; |
| 60 | name = _argv[0]; |
| 61 | } else if (!strcmp(_argv[0], "pipe")) { |
| 62 | _mode = PIPE; |
| 63 | file = "PIPE"; |
| 64 | _argv++; _argc--; |
| 65 | name = _argv[0]; |
| 66 | } else { |
| 67 | _mode = PX; |
| 68 | if (_argc <= 1) |
| 69 | file = "obj"; |
| 70 | name = file; |
| 71 | } |
| 72 | \f |
| 73 | /* |
| 74 | * kludge to check for old style objs. |
| 75 | */ |
| 76 | if (_mode == PX && !strcmp(file, "-")) { |
| 77 | fprintf(stderr, "%s is obsolete and must be recompiled\n", |
| 78 | _argv[0]); |
| 79 | exit(1); |
| 80 | } |
| 81 | /* |
| 82 | * Process program header information |
| 83 | */ |
| 84 | if (_mode == PIPE) { |
| 85 | read(pipe,&pxhd,sizeof(struct pxhdr)); |
| 86 | } else { |
| 87 | prog = fopen(file,"r"); |
| 88 | if (prog == NULL) { |
| 89 | perror(file); |
| 90 | exit(1); |
| 91 | } |
| 92 | fread(&pxhd,sizeof(struct pxhdr),1,prog); |
| 93 | if (pxhd.magicnum != MAGICNUM) { |
| 94 | fseek(prog,(long)(HEADER_BYTES-sizeof(struct pxhdr)),0); |
| 95 | fread(&pxhd,sizeof(struct pxhdr),1,prog); |
| 96 | } |
| 97 | } |
| 98 | if (pxhd.magicnum != MAGICNUM) { |
| 99 | fprintf(stderr,"%s is not a Pascal interpreter file\n",name); |
| 100 | exit(1); |
| 101 | } |
| 102 | if (pxhd.maketime < createtime) { |
| 103 | fprintf(stderr,"%s is obsolete and must be recompiled\n",name); |
| 104 | exit(1); |
| 105 | } |
| 106 | \f |
| 107 | /* |
| 108 | * Load program into memory |
| 109 | */ |
| 110 | objprog = malloc((int)pxhd.objsize); |
| 111 | if (_mode == PIPE) { |
| 112 | bytestoread = pxhd.objsize; |
| 113 | bytesread = 0; |
| 114 | do { |
| 115 | block = read(pipe,(int)(objprog+bytesread),bytestoread); |
| 116 | if (block > 0) { |
| 117 | bytesread += block; |
| 118 | bytestoread -= block; |
| 119 | } |
| 120 | } while (block > 0); |
| 121 | } else { |
| 122 | bytesread = fread(objprog,1,(int)pxhd.objsize,prog); |
| 123 | fclose(prog); |
| 124 | } |
| 125 | if (bytesread != pxhd.objsize) { |
| 126 | fprintf(stderr,"Read error occurred while loading %s\n",file); |
| 127 | exit(1); |
| 128 | } |
| 129 | if (_mode == PIX) |
| 130 | fputs("Execution begins...\n",stderr); |
| 131 | /* |
| 132 | * set interpreter to catch expected signals and begin interpretation |
| 133 | */ |
| 134 | signal(SIGILL,syserr); |
| 135 | signal(SIGBUS,syserr); |
| 136 | signal(SIGSYS,syserr); |
| 137 | if (signal(SIGINT,SIG_IGN) != SIG_IGN) |
| 138 | signal(SIGINT,intr); |
| 139 | signal(SIGSEGV,memsize); |
| 140 | signal(SIGFPE,EXCEPT); |
| 141 | signal(SIGTRAP,liberr); |
| 142 | |
| 143 | /* |
| 144 | * See if we're being watched by the debugger, if so set a trap. |
| 145 | */ |
| 146 | if (_mode == PDX || (_mode == PIX && pxhd.symtabsize > 0)) { |
| 147 | inittrap(&_display, &_dp, objprog, &pcaddrp, loopaddr); |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * do it |
| 152 | */ |
| 153 | interpreter(objprog); |
| 154 | /* |
| 155 | * reset signals, deallocate memory, and exit normally |
| 156 | */ |
| 157 | signal(SIGINT,SIG_IGN); |
| 158 | signal(SIGSEGV,SIG_DFL); |
| 159 | signal(SIGFPE,SIG_DFL); |
| 160 | signal(SIGTRAP,SIG_DFL); |
| 161 | signal(SIGILL,SIG_DFL); |
| 162 | signal(SIGBUS,SIG_DFL); |
| 163 | signal(SIGSYS,SIG_DFL); |
| 164 | PFLUSH(); |
| 165 | psexit(0); |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Generate an IOT trap to tell the debugger that the object code |
| 170 | * has been read in. Parameters are there for debugger to look at, |
| 171 | * not the procedure. |
| 172 | */ |
| 173 | |
| 174 | static inittrap(dispaddr, dpaddr, endaddr, pcaddrp, loopaddrp) |
| 175 | union disply *dispaddr; |
| 176 | struct disp *dpaddr; |
| 177 | char *endaddr; |
| 178 | union progcntr **pcaddrp; |
| 179 | char **loopaddrp; |
| 180 | { |
| 181 | kill(getpid(), SIGIOT); |
| 182 | } |