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/* Tool to make gzipped second stage binary
Copyright (C) 1996,1998 Jakub Jelinek
This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA. */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
FILE *f, *e;
unsigned char buffer[2048];
unsigned char buffer2[2048];
unsigned short diffs[4][2048];
int ndiffs[4];
unsigned int lastv[4];
unsigned int curoff;
unsigned int prevlen;
unsigned int prevoff;
#define MAX_CHANGE 65535
void save(FILE *out, int len, int type)
{
int i, j, k;
int curlen = len;
while (len > 0) {
i = 2048;
if (len < i) i = len;
if (fread (buffer, 1, i, f) != i) {
fprintf(stderr, "read %d from arg3 type %d failed\n", i, type);
exit(1);
}
if (fread (buffer2, 1, i, e) != i) {
fprintf(stderr, "read %d from arg4 type %d failed\n", i, type);
exit(1);
}
for (j = 0; j < i; j++) {
if (buffer[j] != buffer2[j]) {
if (buffer2[j] == buffer[j] + 4) {
if (curoff + j > lastv[type] + MAX_CHANGE) {
if (type || !prevlen || curoff + j >= prevoff + MAX_CHANGE)
goto bad1;
k = lastv[type] + MAX_CHANGE;
if (k < prevoff - prevlen)
goto bad1;
if (k >= prevoff)
k = prevoff - 1;
diffs[type][ndiffs[type]] = k - lastv[type];
lastv[type] = k;
ndiffs[type]++;
}
diffs[type][ndiffs[type]] = curoff + j - lastv[type];
lastv[type] = curoff + j;
ndiffs[type]++;
} else if (buffer2[j] == buffer[j] + 16) {
if (curoff + j > lastv[type+1] + MAX_CHANGE) {
if (type || !prevlen || curoff + j >= prevoff + MAX_CHANGE)
goto bad2;
k = lastv[type+1] + MAX_CHANGE;
if (k < prevoff - prevlen)
goto bad2;
if (k >= prevoff)
k = prevoff - 1;
diffs[type+1][ndiffs[type+1]] = k - lastv[type+1];
lastv[type+1] = k;
ndiffs[type+1]++;
}
diffs[type+1][ndiffs[type+1]] = curoff + j - lastv[type+1];
lastv[type+1] = curoff + j;
ndiffs[type+1]++;
} else {
fprintf(stderr, "Strange, small and large images differ in something"
" different to R_SPARC_32 and R_SPARC_HI22\n");
exit(1);
}
}
}
if (fwrite (buffer, 1, i, out) != i) {
fprintf(stderr, "write %d failed\n", i);
exit(1);
}
len -= i;
curoff += i;
}
prevlen = curlen;
prevoff = curoff;
return;
bad2:
type++;
bad1:
fprintf(stderr, "Distance between two changes larger than %dK %d %d %d\n",
MAX_CHANGE / 1024, type, curoff + j, lastv[type]);
exit(1);
}
int main(int argc, char **argv)
{
FILE *g, *h;
int reloc = SMALL_RELOC;
int first_start, first_end, second_start, second_end;
int end, rodata_start, rodata_end;
int net = 0;
int i = 1;
char sym[256];
unsigned int addr;
if (!strcmp (argv[i], "-a")) {
net = 1;
i++;
}
f = fopen(argv[i++], "r");
while (fgets (buffer, 256, f)) {
char sym[256];
unsigned int addr;
if (sscanf(buffer, "%x %*c %s\n", &addr, sym) == 2) {
if (!strcmp (sym, "start"))
reloc = addr;
else if (!strcmp (sym, "main_text_start"))
first_start = addr - reloc;
else if (!strcmp (sym, "main_text_end"))
first_end = addr - reloc;
else if (!strcmp (sym, "main_data_start"))
second_start = addr - reloc;
else if (!strcmp (sym, "main_data_end"))
second_end = addr - reloc;
else if (!strcmp (sym, "main_rodata_start"))
rodata_start = addr - reloc;
else if (!strcmp (sym, "main_rodata_end"))
rodata_end = addr - reloc;
else if (!strcmp (sym, "__bss_start"))
end = addr - reloc;
}
}
fclose (f);
f = fopen(argv[i++], "r");
e = fopen(argv[i++], "r");
g = fopen(argv[i++], "w");
h = fopen(argv[i++], "w");
if (fread(buffer, 1, 32, f) != 32) exit(1);
if (fread(buffer2, 1, 32, e) != 32) exit(1);
if (memcmp(buffer, buffer2, 32)) {
fprintf(stderr, "Strange. Images for 2.5MB and 3.5MB differ in a.out header\n");
exit(1);
}
if (!net) {
memset (buffer, 0, 2048);
if (fwrite(buffer, 1, 2048, g) != 2048) exit(1);
} else {
if (fwrite (buffer, 1, 32, g) != 32) exit(1);
}
save (g, first_start, 0);
save (h, first_end - first_start, 2);
save (g, rodata_start - first_end, 0);
save (h, rodata_end - rodata_start, 2);
save (g, second_start - rodata_end, 0);
save (h, second_end - second_start, 2);
save (g, end - second_end, 0);
fwrite(diffs[0], 2, ndiffs[0]+1, g);
fwrite(diffs[1], 2, ndiffs[1]+1, g);
fwrite(diffs[2], 2, ndiffs[2]+1, h);
fwrite(diffs[3], 2, ndiffs[3]+1, h);
fclose (f);
fclose (e);
fclose (g);
fclose (h);
exit (0);
}
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