On Wed, Sep 8, 2010 at 4:50 PM, Drasko DRASKOVIC <drasko.drasko...@gmail.com> wrote: > Hi all, > I have a following problem debugging with GDB (v. 7.1) connected via OpenOCD : > If I set hardware break point on a function everything works fine, > program stops, and I can single-step... > But if I set software breakpoint, prokram keeps stopping on this > breakpoint. I can not single step nor continue. > Even when I delete breakpoint explicitly (delete breakpoints in GDB), > program keeps stopping on this breakpoint with every "n", "s", or "c". > > I suspect that breakpoint that GDB have inserted is left in the cache > and never replaced back by the instruction (I am using ARM946 with > caches enabled). > > Any ideas on sources/solution of this problem ? > > Best regards, > Drasko >
Here is an example that depicts situation in more details : > bp 0x128fc 4 breakpoint set at 0x000128fc > resume 0x00008000 target state: halted target halted in ARM state due to breakpoint, current mode: Supervisor cpsr: 0xa0000013 pc: 0x000128fc > resume target state: halted target halted in ARM state due to breakpoint, current mode: Supervisor cpsr: 0xa0000013 pc: 0x000128fc > bp 0x000128fc, 0x4, 1, 0x08 > rbp 0x000128fc > bp > resume target state: halted target halted in ARM state due to breakpoint, current mode: Supervisor cpsr: 0xa0000013 pc: 0x000128fc > resume target state: halted target halted in ARM state due to breakpoint, current mode: Supervisor cpsr: 0xa0000013 pc: 0x000128fc Dumping the memory dhows that instruction is replaced upon inserting breakpoint, and that same instruction is put back in memory when breakpoint is deleted. What is happening in the I-Cache, I have no idea, but I think that one in cache, bkpt is never replaced back with real instruction (just SDRAM addr is replaced, not cache), but I can not confirm this yet. Hope that somebody has an idea... Best regards, Drasko _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
