On Thu, Apr 30, 2009 at 8:18 PM, Bart Oldeman <bartolde...@users.sourceforge.net> wrote: ... > This is a minimal fix for the kernel: > > --- entry.asm (révision 1371) > +++ entry.asm (copie de travail) ... > This bug has been there since the DOS-C days by the way! > > Bart
Thank you! Patch committed along with some comments to help explain what is going on. ... near call to psp:05h which in turn is a far call to 0:0Ch embedded in the psp with the value embedded at psp:06h also the size of the com file (more or less) for CP/M compatibility and 0:0Ch (overlapping where address for int 30h & 31h would be) contains the code to do a far jmp to the code in entry.asm which is where the bug was and now correctly strips the bad return offset and rearranges the stack to match an int 21h call. Additionally limiting this whole tromp around memory to function codes 0 through 24h. Jeremy ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Freedos-kernel mailing list Freedos-kernel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-kernel
