1: /* command line interpretation, image loading etc. for Gforth
2:
3:
4: Copyright (C) 1995 Free Software Foundation, Inc.
5:
6: This file is part of Gforth.
7:
8: Gforth is free software; you can redistribute it and/or
9: modify it under the terms of the GNU General Public License
10: as published by the Free Software Foundation; either version 2
11: of the License, or (at your option) any later version.
12:
13: This program is distributed in the hope that it will be useful,
14: but WITHOUT ANY WARRANTY; without even the implied warranty of
15: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: GNU General Public License for more details.
17:
18: You should have received a copy of the GNU General Public License
19: along with this program; if not, write to the Free Software
20: Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21: */
22:
23: #include "config.h"
24: #include <errno.h>
25: #include <ctype.h>
26: #include <stdio.h>
27: #include <string.h>
28: #include <math.h>
29: #include <sys/types.h>
30: #include <sys/stat.h>
31: #include <fcntl.h>
32: #include <assert.h>
33: #include <stdlib.h>
34: #include "forth.h"
35: #include "io.h"
36: #include "getopt.h"
37:
38: #ifdef MSDOS
39: jmp_buf throw_jmp_buf;
40: #endif
41:
42: #ifndef DEFAULTPATH
43: # define DEFAULTPATH "/usr/local/lib/gforth:."
44: #endif
45:
46: #ifdef DIRECT_THREADED
47: # define CA(n) (symbols[(n)])
48: #else
49: # define CA(n) ((Cell)(symbols+(n)))
50: #endif
51:
52: #define maxaligned(n) (typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
53:
54: static Cell dictsize=0;
55: static Cell dsize=0;
56: static Cell rsize=0;
57: static Cell fsize=0;
58: static Cell lsize=0;
59: char *progname;
60:
61: /* image file format:
62: * "#! binary-path -i\n" (e.g., "#! /usr/local/bin/gforth-0.2.0 -i\n")
63: * padding to a multiple of 8
64: * magic: "Gforth1x" means format 0.2,
65: * where x is even for big endian and odd for little endian
66: * and x & ~1 is the size of the cell in bytes.
67: * padding to max alignment (no padding necessary on current machines)
68: * ImageHeader structure (see below)
69: * data (size in ImageHeader.image_size)
70: * tags ((if relocatable, 1 bit/data cell)
71: *
72: * tag==1 means that the corresponding word is an address;
73: * If the word is >=0, the address is within the image;
74: * addresses within the image are given relative to the start of the image.
75: * If the word =-1 (CF_NIL), the address is NIL,
76: * If the word is <CF_NIL and >CF(DODOES), it's a CFA (:, Create, ...)
77: * If the word =CF(DODOES), it's a DOES> CFA
78: * If the word =CF(DOESJUMP), it's a DOES JUMP (2 Cells after DOES>,
79: * possibly containing a jump to dodoes)
80: * If the word is <CF(DOESJUMP), it's a primitive
81: */
82:
83: typedef struct {
84: Address base; /* base address of image (0 if relocatable) */
85: UCell checksum; /* checksum of ca's to protect against some
86: incompatible binary/executable combinations
87: (0 if relocatable) */
88: UCell image_size; /* all sizes in bytes */
89: UCell dict_size;
90: UCell data_stack_size;
91: UCell fp_stack_size;
92: UCell return_stack_size;
93: UCell locals_stack_size;
94: Xt *boot_entry; /* initial ip for booting (in BOOT) */
95: Xt *throw_entry; /* ip after signal (in THROW) */
96: } ImageHeader;
97: /* the image-header is created in main.fs */
98:
99: void relocate(Cell *image, char *bitstring, int size, Label symbols[])
100: {
101: int i=0, j, k, steps=(size/sizeof(Cell))/8;
102: char bits;
103: /* static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
104:
105: /* printf("relocating %x[%x]\n", image, size); */
106:
107: for(k=0; k<=steps; k++)
108: for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1)
109: if(bits & 0x80)
110: if(image[i]<0)
111: switch(image[i])
112: {
113: case CF_NIL : image[i]=0; break;
114: case CF(DOCOL) :
115: case CF(DOVAR) :
116: case CF(DOCON) :
117: case CF(DOUSER) :
118: case CF(DODEFER) :
119: case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
120: case CF(DODOES) : MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
121: break;
122: case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
123: default :
124: /* printf("Code field generation image[%x]:=CA(%x)\n",
125: i, CF(image[i]));
126: */ image[i]=(Cell)CA(CF(image[i]));
127: }
128: else
129: image[i]+=(Cell)image;
130: }
131:
132: UCell checksum(Label symbols[])
133: {
134: UCell r=0;
135: Cell i;
136:
137: for (i=DOCOL; i<=DOESJUMP; i++) {
138: r ^= (UCell)(symbols[i]);
139: r = (r << 5) | (r >> (8*sizeof(Cell)-5));
140: }
141: #ifdef DIRECT_THREADED
142: /* we have to consider all the primitives */
143: for (; symbols[i]!=(Label)0; i++) {
144: r ^= (UCell)(symbols[i]);
145: r = (r << 5) | (r >> (8*sizeof(Cell)-5));
146: }
147: #else
148: /* in indirect threaded code all primitives are accessed through the
149: symbols table, so we just have to put the base address of symbols
150: in the checksum */
151: r ^= (UCell)symbols;
152: #endif
153: return r;
154: }
155:
156: Address loader(FILE *imagefile, char* filename)
157: /* returns the address of the image proper (after the preamble) */
158: {
159: ImageHeader header;
160: Address image;
161: Address imp; /* image+preamble */
162: Char magic[8];
163: Cell wholesize;
164: Cell imagesize; /* everything needed by the image */
165: Cell preamblesize=0;
166: Label *symbols=engine(0,0,0,0,0);
167: UCell check_sum=checksum(symbols);
168:
169: static char* endianstring[]= { "big","little" };
170:
171: do
172: {
173: if(fread(magic,sizeof(Char),8,imagefile) < 8) {
174: fprintf(stderr,"%s: image %s doesn't seem to be a Gforth (>=0.2) image.\n",
175: progname, filename);
176: exit(1);
177: }
178: preamblesize+=8;
179: #ifdef DEBUG
180: fprintf(stderr,"Magic found: %-8s\n",magic);
181: #endif
182: }
183: while(memcmp(magic,"Gforth1",7));
184:
185: if(magic[7] != sizeof(Cell) +
186: #ifdef WORDS_BIGENDIAN
187: '0'
188: #else
189: '1'
190: #endif
191: )
192: { fprintf(stderr,"This image is %d bit %s-endian, whereas the machine is %d bit %s-endian.\n",
193: ((magic[7]-'0')&~1)*8, endianstring[magic[7]&1],
194: sizeof(Cell)*8, endianstring[
195: #ifdef WORDS_BIGENDIAN
196: 0
197: #else
198: 1
199: #endif
200: ]);
201: exit(-2);
202: };
203:
204: fread((void *)&header,sizeof(ImageHeader),1,imagefile);
205: if (dictsize==0)
206: dictsize = header.dict_size;
207: if (dsize==0)
208: dsize=header.data_stack_size;
209: if (rsize==0)
210: rsize=header.return_stack_size;
211: if (fsize==0)
212: fsize=header.fp_stack_size;
213: if (lsize==0)
214: lsize=header.locals_stack_size;
215: dictsize=maxaligned(dictsize);
216: dsize=maxaligned(dsize);
217: rsize=maxaligned(rsize);
218: lsize=maxaligned(lsize);
219: fsize=maxaligned(fsize);
220:
221: wholesize = preamblesize+dictsize+dsize+rsize+fsize+lsize;
222: imagesize = preamblesize+header.image_size+((header.image_size-1)/sizeof(Cell))/8+1;
223: image=malloc((wholesize>imagesize?wholesize:imagesize)/*+sizeof(Float)*/);
224: /*image = maxaligned(image);*/
225: memset(image,0,wholesize); /* why? - anton */
226: rewind(imagefile); /* fseek(imagefile,0L,SEEK_SET); */
227: fread(image,1,imagesize,imagefile);
228: fclose(imagefile);
229: imp=image+preamblesize;
230:
231: if(header.base==0) {
232: relocate((Cell *)imp,imp+header.image_size,header.image_size,symbols);
233: ((ImageHeader *)imp)->checksum=check_sum;
234: }
235: else if(header.base!=imp) {
236: fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\nThe Gforth installer should look into the INSTALL file\n",
237: progname, (unsigned long)header.base, (unsigned long)imp);
238: exit(1);
239: } else if (header.checksum != check_sum) {
240: fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\nThe Gforth installer should look into the INSTALL file\n",
241: progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
242: exit(1);
243: }
244:
245: ((ImageHeader *)imp)->dict_size=dictsize;
246: ((ImageHeader *)imp)->data_stack_size=dsize;
247: ((ImageHeader *)imp)->return_stack_size=rsize;
248: ((ImageHeader *)imp)->fp_stack_size=fsize;
249: ((ImageHeader *)imp)->locals_stack_size=lsize;
250:
251: CACHE_FLUSH(imp, header.image_size);
252:
253: return imp;
254: }
255:
256: int go_forth(Address image, int stack, Cell *entries)
257: {
258: Cell *sp=(Cell*)(image+dictsize+dsize);
259: Address lp=(Address)((void *)sp+lsize);
260: Float *fp=(Float *)((void *)lp+fsize);
261: Cell *rp=(Cell*)((void *)fp+rsize);
262: Xt *ip=(Xt *)(((ImageHeader *)image)->boot_entry);
263: int throw_code;
264:
265: for(;stack>0;stack--)
266: *--sp=entries[stack-1];
267:
268: #ifndef MSDOS
269: get_winsize();
270: #endif
271:
272: install_signal_handlers(); /* right place? */
273:
274: if ((throw_code=setjmp(throw_jmp_buf))) {
275: static Cell signal_data_stack[8];
276: static Cell signal_return_stack[8];
277: static Float signal_fp_stack[1];
278:
279: signal_data_stack[7]=throw_code;
280:
281: return((int)engine(((ImageHeader *)image)->throw_entry,signal_data_stack+7,
282: signal_return_stack+8,signal_fp_stack,0));
283: }
284:
285: return((int)engine(ip,sp,rp,fp,lp));
286: }
287:
288: int convsize(char *s, int elemsize)
289: /* converts s of the format #+u (e.g. 25k) into the number of bytes.
290: the unit u can be one of bekM, where e stands for the element
291: size. default is e */
292: {
293: char *endp;
294: int n,m;
295:
296: m = elemsize;
297: n = strtoul(s,&endp,0);
298: if (endp!=NULL) {
299: if (strcmp(endp,"b")==0)
300: m=1;
301: else if (strcmp(endp,"k")==0)
302: m=1024;
303: else if (strcmp(endp,"M")==0)
304: m=1024*1024;
305: else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
306: fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
307: exit(1);
308: }
309: }
310: return n*m;
311: }
312:
313: int main(int argc, char **argv, char **env)
314: {
315: char *path, *path1;
316: char *imagename="gforth.fi";
317: FILE *image_file;
318: int c, retvalue;
319:
320: #if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
321: /* turn on alignment checks on the 486.
322: * on the 386 this should have no effect. */
323: __asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
324: /* this is unusable with Linux' libc.4.6.27, because this library is
325: not alignment-clean; we would have to replace some library
326: functions (e.g., memcpy) to make it work */
327: #endif
328:
329: progname = argv[0];
330: if ((path=getenv("GFORTHPATH"))==NULL)
331: path = DEFAULTPATH;
332: opterr=0;
333: while (1) {
334: int option_index=0;
335: static struct option opts[] = {
336: {"image-file", required_argument, NULL, 'i'},
337: {"dictionary-size", required_argument, NULL, 'm'},
338: {"data-stack-size", required_argument, NULL, 'd'},
339: {"return-stack-size", required_argument, NULL, 'r'},
340: {"fp-stack-size", required_argument, NULL, 'f'},
341: {"locals-stack-size", required_argument, NULL, 'l'},
342: {"path", required_argument, NULL, 'p'},
343: {0,0,0,0}
344: /* no-init-file, no-rc? */
345: };
346:
347: c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:", opts, &option_index);
348:
349: if (c==EOF)
350: break;
351: if (c=='?') {
352: optind--;
353: break;
354: }
355: switch (c) {
356: case 'i': imagename = optarg; break;
357: case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
358: case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
359: case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
360: case 'f': fsize = convsize(optarg,sizeof(Float)); break;
361: case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
362: case 'p': path = optarg; break;
363: }
364: }
365: path1=path;
366:
367: if(strchr(imagename, '/')==NULL)
368: {
369: do {
370: char *pend=strchr(path, ':');
371: if (pend==NULL)
372: pend=path+strlen(path);
373: if (strlen(path)==0) {
374: fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
375: progname, imagename, path1);
376: exit(1);
377: }
378: {
379: int dirlen=pend-path;
380: char fullfilename[dirlen+strlen(imagename)+2];
381: memcpy(fullfilename, path, dirlen);
382: if (fullfilename[dirlen-1]!='/')
383: fullfilename[dirlen++]='/';
384: strcpy(fullfilename+dirlen,imagename);
385: image_file=fopen(fullfilename,"rb");
386: }
387: path=pend+(*pend==':');
388: } while (image_file==NULL);
389: }
390: else
391: {
392: image_file=fopen(imagename,"rb");
393: if(image_file==NULL) {
394: fprintf(stderr,"%s: %s: %s\n", progname, imagename, strerror(errno));
395: exit(1);
396: }
397: }
398:
399: {
400: Cell environ[]= {
401: (Cell)argc-(optind-1),
402: (Cell)(argv+(optind-1)),
403: (Cell)path1};
404: argv[optind-1] = progname;
405: /*
406: for (i=0; i<environ[0]; i++)
407: printf("%s\n", ((char **)(environ[1]))[i]);
408: */
409: retvalue=go_forth(loader(image_file, imagename),3,environ);
410: deprep_terminal();
411: exit(retvalue);
412: }
413: }
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