Compiling real mode asm (rootkit.arsenal)

Question

Im stuck on compiling the tsr.asm code provided in the book rootkit arsenal. I installed open watcom on a XP maschine and the first asm listing was compiled well.

When compiling, it throws the error: "multiple starting address found" (nothing found on google). Can anyone confirm that this code is compilable, and how?

Im thankful for any suggestions.

Answer 1

When you're writing some code, there is a particular address where the execution is to begin (the main function in C for example), but in your code there are more than one starting address, and it crashes when compiling. But without seeing the code I can't tell you more.

Answer 2

Sorry for the late answer, but I was searching for an answer to this and just figured it out - hopefully it'll help someone else Googling around for an answer.

Since you're using OpenWatcom (I'm using version 1.9), I'll assume that you have tsr.asm in its own OpenWatcom 16-bit DOS COM project. In the IDE, go to Targets -> Target Options -> Linker Switches. In the window that appears, select "2. Import, Export and Library Switches" from the drop-down at the top and remove the cstart_t entry under "Library files(,): [libf]".

Recompile, and your TSR COM file should be generated.