Daniel Schwierzeck daniel.schwierzeck@gmail.com writes:
will be simply exited. The SDBBP handler currently only prints the content of registers c0_depc and c0_debug. This could be extended in the future to handle semi-hosting according to the MIPS UHI specification.
Thanks for considering UHI in this. I worked on a prototype implementation of UHI with Paul that is yet to be submitted which hooks the syscall exception in U-Boot. There is a way to avoid going all the way down to debug mode to process a UHI operation on-target so we can support cores that don't have ejtag or simply to stay out of debug mode wherever possible. The basic principle is that either an application doesn't install its own exception vector and hence uses U-boot's or it does install its own but remembers where U-boot's EBASE was and unwinds a SYSCALL exception and forwards it to U-boot's general-exception handler. It seems to work pretty well but there is certainly no harm in hooking the debug vector too.
Matthew