This directory contains two programs:
mkswitch:
- C program, necessary for regenerating the giant switches
- which are part of the INT project.
-
-mkfuncs:
- shell script that can be used to generate new function
- files, if a new implementation is needed.
+ C program, necessary for regenerating the giant switch
+ needed for the disassembly function of the interpreter,
+ which (still) works with Operand access method 2
+ (Intelligent Routines) as described in "The EM
+ interpreter".
+
+mkiswitch:
+ C program, necessary for regenerating the giant switch
+ needed for finding the correct instruction handling routine
+ for each opcode. It works with Operand access method 3
+ (Intelligent Calls) as described in "The EM interpreter".
+ It constructs the operand of the instruction and passes
+ it to the appropriate routine with the operand as
+ argument.
The first program reads an input file which holds the interpreter
opcode table (as shown in the [IR-81] report appendix B),
arguments. The names of the generated files are: do_XXX.c, where
XXX is the name of the corresponding instruction group.
+(Note: these remarks about mkfuncs are probably outdated now,
+since mkfuncs has disappeared. -rbf)
--- /dev/null
+/*
+ Generates contents of opcode switch from ip_spec.t,
+ and parameter descriptions of em_flag.h.
+
+ Call is:
+ mkiswitch prefix ip_spec.t cases
+
+*/
+
+/* $Header$ */
+
+#include <stdio.h>
+
+extern char *sprintf();
+extern FILE *popen();
+
+#include <util/ass/ip_spec.h>
+#include <h/em_spec.h>
+#include <h/em_flag.h>
+
+extern char em_mnem[][4] ;
+extern char em_flag[] ;
+
+char *progname;
+
+FILE *ifp; /* Input File Pointer */
+FILE *ofp; /* Output File Pointer */
+char *Prefix; /* Prefix for function name */
+
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ char mnem[8]; /* Mnemonic */
+ char flgs[8]; /* Flags */
+ char argstr[256]; /* To build argument */
+
+ progname = argv[0];
+
+ if (argc != 4 ) {
+ fatal("usage is: %s prefix ip_spec.t cases\n",
+ argv[0]);
+ }
+
+ Prefix = argv[1];
+
+ if ((ifp = fopen(argv[2], "r")) == 0) {
+ fatal("cannot open '%s' for reading\n", argv[2]);
+ }
+
+ if ((ofp = fopen(argv[3], "w")) == 0) {
+ fatal("cannot open '%s' for writing\n", argv[3]);
+ }
+
+ /* Start reading the input file */
+ while (fscanf(ifp, "%s %s", mnem, flgs) >= 0) {
+ int i;
+ char *p;
+ char *base;
+ int cnt, first;
+ int mnemcode;
+
+ /* check flags */
+ for (p = flgs; *p; p++) {
+ if (!in("-ms2u4eNPwo", *p)) {
+ fatal("bad flags ip_spec: %s\n", flgs);
+ }
+ }
+
+ if ( in(flgs, '-')
+ + in(flgs, 'm')
+ + in(flgs, 's')
+ + in(flgs, '2')
+ + in(flgs, 'u')
+ + in(flgs, '4')
+ != 1
+ ) {
+ fatal("duplicate or missing opcode flag ip_spec: %s\n",
+ flgs);
+ }
+
+ if ( in(flgs, 'N')
+ + in(flgs, 'P')
+ > 1
+ ) {
+ fatal("duplicate restriction flags ip_spec: %s\n", flgs);
+ }
+
+ mnemcode = getmnem(mnem);
+
+
+ /* capitalize mnemonic */
+ for (p = mnem; *p; p++) {
+ *p += ('A' - 'a');
+ }
+
+ /* scan rest of line */
+ if ( in(flgs, '-')
+ || in(flgs, '2')
+ || in(flgs, 'u')
+ || in(flgs, '4')
+ ) {
+ fscanf(ifp, " %d \n", &first);
+ }
+ else {
+ fscanf(ifp, " %d %d \n", &cnt, &first);
+ }
+
+ /* determine base */
+ if (in(flgs, 'e')) /* Escaped (secondary) opcode */
+ base = "SEC_BASE";
+ else
+ if (in(flgs, '4')) /* Escaped (tertiary) opcode */
+ base = "TERT_BASE";
+ else
+ base = "PRIM_BASE";
+
+ /* analyse the opcode */
+ if (in(flgs, '-')) {
+ if ((em_flag[mnemcode] & EM_PAR) == PAR_W) {
+ /* Implicit argument on stack */
+ ImplicitArg(argstr);
+ OutCase(mnem, base, first, 0, argstr);
+ } else {
+ /* No arguments */
+ NoArgs(argstr);
+ OutCase(mnem, base, first, 0, argstr);
+ }
+ } else if (in(flgs, 'm')) { /* Mini */
+ for (i = 0; i<cnt; i++) {
+ Mini(argstr, i, flgs);
+ OutCase(mnem, base, first, i, argstr);
+ }
+ } else if (in(flgs, 's')) { /* Shortie */
+ for (i = 0; i<cnt; i++) {
+ Shortie(argstr, i, flgs);
+ OutCase(mnem, base, first, i, argstr);
+ }
+ } else if (in(flgs, '2')) { /* Two byte signed */
+ TwoSgn(argstr, flgs);
+ OutCase(mnem, base, first, 0, argstr);
+ } else if (in(flgs, 'u')) { /* Two byte unsigned */
+ TwoUns(argstr, flgs);
+ OutCase(mnem, base, first, 0, argstr);
+ } else if (in(flgs, '4')) { /* Four byte signed */
+ FourSgn(argstr, flgs);
+ OutCase(mnem, base, first, 0, argstr);
+ } else {
+ fatal("no opcode flag in ip_spec %s\n", flgs);
+ }
+ }
+ exit(0);
+}
+
+
+OutCase(mnem, base, first, i, argstr)
+ char *mnem;
+ char *base;
+ int first;
+ int i;
+ char *argstr;
+{
+ /* Output a case in the switch statement */
+ fprintf(ofp, "\t\tcase %s+%d:\t%s%s(%s); break;\n",
+ base, first+i, Prefix, mnem, argstr);
+}
+
+
+
+
+ImplicitArg(argstr)
+ char *argstr;
+{
+ sprintf(argstr, "uwpop()");
+}
+
+NoArgs(argstr)
+ char *argstr;
+{
+ sprintf(argstr, "");
+}
+
+Mini(argstr, i, flgs)
+ char *argstr;
+ int i;
+ char *flgs;
+{
+ int newi = in(flgs, 'N') ? (-i-1) : in(flgs, 'o') ? (i+1) : i;
+
+ switch (newi) {
+ case -1:
+ sprintf(argstr, "%s",
+ in(flgs, 'w') ? "-wsize" : "-1L");
+ break;
+ case 0:
+ sprintf(argstr, "0L");
+ break;
+ case 1:
+ sprintf(argstr, "%s",
+ in(flgs, 'w') ? "wsize" : "1L");
+ break;
+ default:
+ sprintf(argstr, "%dL%s",
+ newi, in(flgs, 'w') ? "*wsize" : "");
+ break;
+ }
+}
+
+Shortie(argstr, i, flgs)
+ char *argstr;
+ int i;
+ char *flgs;
+{
+ int newi = in(flgs, 'N') ? (-i-1) : in(flgs, 'o') ? (i+1) : i;
+
+ sprintf(argstr, "S_arg(%d)*%s",
+ newi, in(flgs, 'w') ? "wsize" : "1L");
+}
+
+TwoSgn(argstr, flgs)
+ char *argstr;
+ char *flgs;
+{
+
+ sprintf(argstr, "%s*%s", in(flgs, 'P') ? "P_arg_2()" : in(flgs, 'N') ? "N_arg_2()" : "L_arg_2()",
+ in(flgs, 'w') ? "wsize" : "1L");
+}
+
+TwoUns(argstr, flgs)
+ char *argstr;
+ char *flgs;
+{
+
+ sprintf(argstr, "%s*%s", "U_arg()",
+ in(flgs, 'w') ? "wsize" : "((unsigned long) 1)");
+}
+
+FourSgn(argstr, flgs)
+ char *argstr;
+ char *flgs;
+{
+
+ sprintf(argstr, "%s*%s", in(flgs, 'P') ? "P_arg_4()" : in(flgs, 'N') ? "N_arg_4()" : "L_arg_4()",
+ in(flgs, 'w') ? "wsize" : "1L");
+}
+
+int
+in(flgs, c)
+ char *flgs;
+ char c;
+{
+ while (*flgs)
+ if (c == *flgs++)
+ return 1;
+ return 0;
+}
+
+fatal(fmt, str)
+ char *fmt;
+ char *str;
+{
+ fprintf(stderr, "%s, (fatal error): ", progname);
+ fprintf(stderr, fmt, str);
+ fprintf(stderr, "\n");
+ exit(1);
+}
+int getmnem(str) char *str ; {
+ char (*ptr)[4] ;
+
+ for ( ptr = em_mnem ; *ptr<= &em_mnem[sp_lmnem][0] ; ptr++ ) {
+ if ( strcmp(*ptr,str)==0 ) return (ptr-em_mnem) ;
+ }
+ fatal("Illegal mnemonic") ;
+ return 0 ;
+}
+
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