| 119,9 → 119,19 |
|---|
| myptr[0x16] = rmodseg & 0xff; /* RMOD is his own parent */ |
| myptr[0x17] = rmodseg >> 8; |
| |
| /* patch up RMOD's PSP: SS:SP pointer @ 0x2E-0x31 */ |
| myptr[0x2e] = 254; /* I abuse the PSP's command line tail as stack */ |
| myptr[0x2f] = 0; |
| /* patch up RMOD's PSP: SS:SP pointer @ 0x2E-0x31 -- I abuse the PSP's |
| * command line tail as stack, but I do NOT set the stacat the end of the |
| * tail. E. C. Masloch kindly explained why this would be a bad idea: |
| * |
| * "This is wrong and will potentially overwrite part of your buffers that |
| * start past the PSP. This is because the dword [PSP:2Eh] is not used merely |
| * to set SS:SP but rather to find the stack frame created by the int 21h |
| * call. Therefore the int 21h call that terminates the child process will |
| * then pop a number of registers off starting from the address stored in the |
| * PSP." <https://github.com/SvarDOS/bugz/issues/38#issuecomment-1817445740> |
| */ |
| myptr[0x2e] = 192; /* middle of the command line tail area so I have 64 bytes */ |
| myptr[0x2f] = 0; /* before and 64 bytes in front of me */ |
| myptr[0x30] = rmodseg & 0xff; |
| myptr[0x31] = rmodseg >> 8; |
| |