[lldb-dev] ARM AARCH64 and AARCH32 in the same debugger
jmolenda at apple.com
Mon Jan 12 14:47:22 PST 2015
I'm guessing the JTAG probe vends a single gdb-remote connection that is either seeing the user-process aarch32 or the hypervisor aarch64 at any given time. So you're stepping along in aarch32 mode and then it syscalls out to aarch64, all within a single Target.
I think this is akin to the folks doing the low-level startup routines on x86 machines - it changes its architecture from 32-bit to 64-bit as it brings up the system. From lldb's point of view this is a single Target that changes architecture during the debug session.
> On Jan 12, 2015, at 2:36 PM, Greg Clayton <gclayton at apple.com> wrote:
> Yes you can: you can have one target for the 32 bit ARM and one for the 64 bit one. You currently can't have one target (process) be both 32 and 64 bit, but you can do this with two targets. I am guessing you would have one target that is debugging the user space process and one for the 64 bit hypervisor routine which I am assuming is the kernel?
> This is exactly why we developed LLDB with a modular plug-in based architecture.
>> On Jan 12, 2015, at 2:07 PM, Ted Woodward <ted.woodward at codeaurora.org> wrote:
>> Here’s a scenario I’m being asked about:
>> A CPU is executing in AARCH32. LLDB is talking to a JTAG probe via gdb remote. The user stops the program, and it’s in an Android user space application. Can we single step through it, and then an AARCH64 Hypervisor routine, in the same LLDB instance? What would we need to set up to do this?
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