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Lucho's fix to use start_seg-2 instead of hard coded 0x60-2 in UPX trailer 

git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/branches/UNSTABLE@1014 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Kenneth J Davis 2004-08-10 20:21:01 +00:00
parent f4ab00c556
commit 03fc88df3e
1 changed files with 7 additions and 2 deletions
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9
utils/exeflat.c
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@ -94,6 +94,9 @@ int main(int argc, char **argv)
short silentSegments[20], silentcount = 0, silentdone = 0;
int UPX = FALSE;
/* if no arguments provided, show usage and exit */
if (argc < 4) usage();
/* do optional argument processing here */
for (i = 4; i < argc; i++)
{
@ -282,13 +285,14 @@ int main(int argc, char **argv)
/* UPX trailer */
/* hand assembled - so this remains ANSI C ;-) */
/* move kernel down to place CONFIG-block, which added above,
at 0x5e:0 instead 0x60:0 and store there boot drive number
at start_seg-2:0 (e.g. 0x5e:0) instead of
start_seg:0 (e.g. 0x60:0) and store there boot drive number
from BL; kernel.asm will then check presence of additional
CONFIG-block at this address. */
static char trailer[] = {
0x0E, /* 0 push cs */
0x1F, /* 1 pop ds ; =0x60 */
0xBF,0x5E,0x00, /* 2 mov di,0x5E */
0xBF,0x5E,0x00, /* 2 mov di,start_seg-2 */
0x8E,0xC7, /* 5 mov es,di */
0xFC, /* 7 cld */
0x33,0xFF, /* 8 xor di,di */
@ -303,6 +307,7 @@ int main(int argc, char **argv)
0x33,0xFF, /* 27 xor di,di */
0xFF,0xE7, /* 29 jmp di ; jmp 0 */
};
*(short *)&trailer[3] = start_seg - 2;
*(short *)&trailer[15] = (short)size + 0x20;
*(short *)&trailer[20] = start_seg + header.exInitSS;
*(short *)&trailer[25] = header.exInitSP;