| Line 110... |
Line 110... |
| 110 |
myptr = MK_FP(rmodseg, 0);
|
110 |
myptr = MK_FP(rmodseg, 0);
|
| 111 |
{
|
111 |
{
|
| 112 |
unsigned short i;
|
112 |
unsigned short i;
|
| 113 |
char *mypsp = (void *)0;
|
113 |
char *mypsp = (void *)0;
|
| 114 |
for (i = 0; i < 0x100; i++) myptr[i] = mypsp[i];
|
114 |
for (i = 0; i < 0x100; i++) myptr[i] = mypsp[i];
|
| 115 |
for (i = 0x18; i < 0x18+20; i++) myptr[i] = 0xff;
|
115 |
/* for (i = 0x18; i < 0x18+20; i++) myptr[i] = 0xff; */ /* do NOT close file handlers, RMOD's children might need stdin/stdout/etc */
|
| 116 |
}
|
116 |
}
|
| 117 |
|
117 |
|
| 118 |
/* patch up RMOD's PSP: Parent's PSP segment @ 0x16-0x17 */
|
118 |
/* patch up RMOD's PSP: Parent's PSP segment @ 0x16-0x17 */
|
| 119 |
myptr[0x16] = rmodseg & 0xff; /* RMOD is his own parent */
|
119 |
myptr[0x16] = rmodseg & 0xff; /* RMOD is his own parent */
|
| 120 |
myptr[0x17] = rmodseg >> 8;
|
120 |
myptr[0x17] = rmodseg >> 8;
|
| 121 |
|
121 |
|
| 122 |
/* patch up RMOD's PSP: SS:SP pointer @ 0x2E-0x31 -- I abuse the PSP's
|
122 |
/* patch up RMOD's PSP: SS:SP pointer @ 0x2E-0x31 -- I abuse the PSP's
|
| 123 |
* command line tail as stack, but I do NOT set the stacat the end of the
|
123 |
* command line tail as stack, but I do NOT set the stack at the end of the
|
| 124 |
* tail. E. C. Masloch kindly explained why this would be a bad idea:
|
124 |
* tail. E. C. Masloch kindly explained why this would be a bad idea:
|
| 125 |
*
|
125 |
*
|
| 126 |
* "This is wrong and will potentially overwrite part of your buffers that
|
126 |
* "This is wrong and will potentially overwrite part of your buffers that
|
| 127 |
* start past the PSP. This is because the dword [PSP:2Eh] is not used merely
|
127 |
* start past the PSP. This is because the dword [PSP:2Eh] is not used merely
|
| 128 |
* to set SS:SP but rather to find the stack frame created by the int 21h
|
128 |
* to set SS:SP but rather to find the stack frame created by the int 21h
|