/* command line interpretation, image loading etc. for Gforth
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of Gforth.
Gforth is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "config.h"
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <stdlib.h>
#include "forth.h"
#include "io.h"
#include "getopt.h"
#ifdef MSDOS
jmp_buf throw_jmp_buf;
#endif
#ifndef DEFAULTPATH
# define DEFAULTPATH "/usr/local/lib/gforth:."
#endif
#ifdef DIRECT_THREADED
# define CA(n) (symbols[(n)])
#else
# define CA(n) ((Cell)(symbols+(n)))
#endif
#define maxaligned(n) (typeof(n))((((Cell)n)+sizeof(Float)-1)&-sizeof(Float))
static Cell dictsize=0;
static Cell dsize=0;
static Cell rsize=0;
static Cell fsize=0;
static Cell lsize=0;
char *progname;
/* image file format:
* "#! binary-path -i\n" (e.g., "#! /usr/local/bin/gforth-0.2.0 -i\n")
* padding to a multiple of 8
* magic: "Gforth1x" means format 0.2,
* where x is even for big endian and odd for little endian
* and x & ~1 is the size of the cell in bytes.
* padding to max alignment (no padding necessary on current machines)
* ImageHeader structure (see below)
* data (size in ImageHeader.image_size)
* tags ((if relocatable, 1 bit/data cell)
*
* tag==1 means that the corresponding word is an address;
* If the word is >=0, the address is within the image;
* addresses within the image are given relative to the start of the image.
* If the word =-1 (CF_NIL), the address is NIL,
* If the word is <CF_NIL and >CF(DODOES), it's a CFA (:, Create, ...)
* If the word =CF(DODOES), it's a DOES> CFA
* If the word =CF(DOESJUMP), it's a DOES JUMP (2 Cells after DOES>,
* possibly containing a jump to dodoes)
* If the word is <CF(DOESJUMP), it's a primitive
*/
typedef struct {
Address base; /* base address of image (0 if relocatable) */
UCell checksum; /* checksum of ca's to protect against some
incompatible binary/executable combinations
(0 if relocatable) */
UCell image_size; /* all sizes in bytes */
UCell dict_size;
UCell data_stack_size;
UCell fp_stack_size;
UCell return_stack_size;
UCell locals_stack_size;
Xt *boot_entry; /* initial ip for booting (in BOOT) */
Xt *throw_entry; /* ip after signal (in THROW) */
} ImageHeader;
/* the image-header is created in main.fs */
void relocate(Cell *image, char *bitstring, int size, Label symbols[])
{
int i=0, j, k, steps=(size/sizeof(Cell))/8;
char bits;
/* static char bits[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};*/
/* printf("relocating %x[%x]\n", image, size); */
for(k=0; k<=steps; k++)
for(j=0, bits=bitstring[k]; j<8; j++, i++, bits<<=1)
if(bits & 0x80)
if(image[i]<0)
switch(image[i])
{
case CF_NIL : image[i]=0; break;
case CF(DOCOL) :
case CF(DOVAR) :
case CF(DOCON) :
case CF(DOUSER) :
case CF(DODEFER) :
case CF(DOFIELD) : MAKE_CF(image+i,symbols[CF(image[i])]); break;
case CF(DODOES) : MAKE_DOES_CF(image+i,image[i+1]+((Cell)image));
break;
case CF(DOESJUMP): MAKE_DOES_HANDLER(image+i); break;
default :
/* printf("Code field generation image[%x]:=CA(%x)\n",
i, CF(image[i]));
*/ image[i]=(Cell)CA(CF(image[i]));
}
else
image[i]+=(Cell)image;
}
UCell checksum(Label symbols[])
{
UCell r=0;
Cell i;
for (i=DOCOL; i<=DOESJUMP; i++) {
r ^= (UCell)(symbols[i]);
r = (r << 5) | (r >> (8*sizeof(Cell)-5));
}
#ifdef DIRECT_THREADED
/* we have to consider all the primitives */
for (; symbols[i]!=(Label)0; i++) {
r ^= (UCell)(symbols[i]);
r = (r << 5) | (r >> (8*sizeof(Cell)-5));
}
#else
/* in indirect threaded code all primitives are accessed through the
symbols table, so we just have to put the base address of symbols
in the checksum */
r ^= (UCell)symbols;
#endif
return r;
}
Address loader(FILE *imagefile)
/* returns the address of the image proper (after the preamble) */
{
ImageHeader header;
Address image;
Address imp; /* image+preamble */
Char magic[8];
Cell wholesize;
Cell imagesize; /* everything needed by the image */
Cell preamblesize=0;
Label *symbols=engine(0,0,0,0,0);
UCell check_sum=checksum(symbols);
static char* endianstring[]= { "big","little" };
do
{
if(fread(magic,sizeof(Char),8,imagefile) < 8) {
fprintf(stderr,"%s: image doesn't seem to be a Gforth (>=0.2) image.\n",progname);
exit(1);
}
preamblesize+=8;
#ifdef DEBUG
fprintf(stderr,"Magic found: %-8s\n",magic);
#endif
}
while(memcmp(magic,"Gforth1",7));
if(magic[7] != sizeof(Cell) +
#ifdef WORDS_BIGENDIAN
'0'
#else
'1'
#endif
)
{ fprintf(stderr,"This image is %d bit %s-endian, whereas the machine is %d bit %s-endian.\n",
((magic[7]-'0')&~1)*8, endianstring[magic[7]&1],
sizeof(Cell)*8, endianstring[
#ifdef WORDS_BIGENDIAN
0
#else
1
#endif
]);
exit(-2);
};
fread((void *)&header,sizeof(ImageHeader),1,imagefile);
if (dictsize==0)
dictsize = header.dict_size;
if (dsize==0)
dsize=header.data_stack_size;
if (rsize==0)
rsize=header.return_stack_size;
if (fsize==0)
fsize=header.fp_stack_size;
if (lsize==0)
lsize=header.locals_stack_size;
dictsize=maxaligned(dictsize);
dsize=maxaligned(dsize);
rsize=maxaligned(rsize);
lsize=maxaligned(lsize);
fsize=maxaligned(fsize);
wholesize = preamblesize+dictsize+dsize+rsize+fsize+lsize;
imagesize = preamblesize+header.image_size+((header.image_size-1)/sizeof(Cell))/8+1;
image=malloc((wholesize>imagesize?wholesize:imagesize)/*+sizeof(Float)*/);
/*image = maxaligned(image);*/
memset(image,0,wholesize); /* why? - anton */
rewind(imagefile); /* fseek(imagefile,0L,SEEK_SET); */
fread(image,1,imagesize,imagefile);
fclose(imagefile);
imp=image+preamblesize;
if(header.base==0) {
relocate((Cell *)imp,imp+header.image_size,header.image_size,symbols);
((ImageHeader *)imp)->checksum=check_sum;
}
else if(header.base!=imp) {
fprintf(stderr,"%s: Cannot load nonrelocatable image (compiled for address $%lx) at address $%lx\nThe Gforth installer should look into the INSTALL file\n",
progname, (unsigned long)header.base, (unsigned long)imp);
exit(1);
} else if (header.checksum != check_sum) {
fprintf(stderr,"%s: Checksum of image ($%lx) does not match the executable ($%lx)\nThe Gforth installer should look into the INSTALL file\n",
progname, (unsigned long)(header.checksum),(unsigned long)check_sum);
exit(1);
}
((ImageHeader *)imp)->dict_size=dictsize;
((ImageHeader *)imp)->data_stack_size=dsize;
((ImageHeader *)imp)->return_stack_size=rsize;
((ImageHeader *)imp)->fp_stack_size=fsize;
((ImageHeader *)imp)->locals_stack_size=lsize;
CACHE_FLUSH(imp, header.image_size);
return imp;
}
int go_forth(Address image, int stack, Cell *entries)
{
Cell *sp=(Cell*)(image+dictsize+dsize);
Address lp=(Address)((void *)sp+lsize);
Float *fp=(Float *)((void *)lp+fsize);
Cell *rp=(Cell*)((void *)fp+rsize);
Xt *ip=(Xt *)(((ImageHeader *)image)->boot_entry);
int throw_code;
for(;stack>0;stack--)
*--sp=entries[stack-1];
get_winsize();
install_signal_handlers(); /* right place? */
if ((throw_code=setjmp(throw_jmp_buf))) {
static Cell signal_data_stack[8];
static Cell signal_return_stack[8];
static Float signal_fp_stack[1];
signal_data_stack[7]=throw_code;
return((int)engine(((ImageHeader *)image)->throw_entry,signal_data_stack+7,
signal_return_stack+8,signal_fp_stack,0));
}
return((int)engine(ip,sp,rp,fp,lp));
}
int convsize(char *s, int elemsize)
/* converts s of the format #+u (e.g. 25k) into the number of bytes.
the unit u can be one of bekM, where e stands for the element
size. default is e */
{
char *endp;
int n,m;
m = elemsize;
n = strtoul(s,&endp,0);
if (endp!=NULL) {
if (strcmp(endp,"b")==0)
m=1;
else if (strcmp(endp,"k")==0)
m=1024;
else if (strcmp(endp,"M")==0)
m=1024*1024;
else if (strcmp(endp,"e")!=0 && strcmp(endp,"")!=0) {
fprintf(stderr,"%s: cannot grok size specification %s: invalid unit \"%s\"\n", progname, s, endp);
exit(1);
}
}
return n*m;
}
int main(int argc, char **argv, char **env)
{
char *path, *path1;
char *imagename="gforth.fi";
FILE *image_file;
int c, retvalue;
#if defined(i386) && defined(ALIGNMENT_CHECK) && !defined(DIRECT_THREADED)
/* turn on alignment checks on the 486.
* on the 386 this should have no effect. */
__asm__("pushfl; popl %eax; orl $0x40000, %eax; pushl %eax; popfl;");
/* this is unusable with Linux' libc.4.6.27, because this library is
not alignment-clean; we would have to replace some library
functions (e.g., memcpy) to make it work */
#endif
progname = argv[0];
if ((path=getenv("GFORTHPATH"))==NULL)
path = strcpy(malloc(strlen(DEFAULTPATH)+1),DEFAULTPATH);
opterr=0;
while (1) {
int option_index=0;
static struct option opts[] = {
{"image-file", required_argument, NULL, 'i'},
{"dictionary-size", required_argument, NULL, 'm'},
{"data-stack-size", required_argument, NULL, 'd'},
{"return-stack-size", required_argument, NULL, 'r'},
{"fp-stack-size", required_argument, NULL, 'f'},
{"locals-stack-size", required_argument, NULL, 'l'},
{"path", required_argument, NULL, 'p'},
{0,0,0,0}
/* no-init-file, no-rc? */
};
c = getopt_long(argc, argv, "+i:m:d:r:f:l:p:", opts, &option_index);
if (c==EOF)
break;
if (c=='?') {
optind--;
break;
}
switch (c) {
case 'i': imagename = optarg; break;
case 'm': dictsize = convsize(optarg,sizeof(Cell)); break;
case 'd': dsize = convsize(optarg,sizeof(Cell)); break;
case 'r': rsize = convsize(optarg,sizeof(Cell)); break;
case 'f': fsize = convsize(optarg,sizeof(Float)); break;
case 'l': lsize = convsize(optarg,sizeof(Cell)); break;
case 'p': path = optarg; break;
}
}
path1=path;
if(strchr(imagename, '/')==NULL)
{
do {
char *pend=strchr(path, ':');
if (pend==NULL)
pend=path+strlen(path);
if (strlen(path)==0) {
fprintf(stderr,"%s: cannot open image file %s in path %s for reading\n",
progname, imagename, path1);
exit(1);
}
{
int dirlen=pend-path;
char fullfilename[dirlen+strlen(imagename)+2];
memcpy(fullfilename, path, dirlen);
if (fullfilename[dirlen-1]!='/')
fullfilename[dirlen++]='/';
strcpy(fullfilename+dirlen,imagename);
image_file=fopen(fullfilename,"rb");
}
path=pend+(*pend==':');
} while (image_file==NULL);
}
else
{
image_file=fopen(imagename,"rb");
if(image_file==NULL) {
fprintf(stderr,"%s: %s: %s\n", progname, imagename, strerror(errno));
exit(1);
}
}
{
Cell environ[]= {
(Cell)argc-(optind-1),
(Cell)(argv+(optind-1)),
(Cell)path1};
argv[optind-1] = progname;
/*
for (i=0; i<environ[0]; i++)
printf("%s\n", ((char **)(environ[1]))[i]);
*/
retvalue=go_forth(loader(image_file),3,environ);
deprep_terminal();
exit(retvalue);
}
}
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