Document radare2 debugger interface

[Wenzel]

We will have to understand how radare2 debugger internals works to figure out how we should implement some specific features of r2vmi

[Wenzel]

From https://github.com/radare/radare2/blob/b25653ec2ae48bad9a554753d0c21ce86b0e7e0a/libr/debug/p/debug_native.c#L1523:

/*
 * set or unset breakpoints...
 *
 * we only handle the case for hardware breakpoints here. otherwise,
 * we let the caller handle the work.
 */

So if __breakpoint returns false, the caller will handle the software breakpoints ?

[Wenzel]

I found a documentation regarding debugger internals:
https://github.com/radare/radare2/blob/master/doc/debug-internals.md

[Wenzel]

Yes the caller is handling writing the software breakpoint:
https://github.com/radare/radare2/blob/master/libr/bp/bp_io.c#L49