When writing an object file over gdb-remote, use the vFlashErase, vFlashWrite, and vFlashDone commands if the write address is in a flash memory region. A bare metal target may have this kind of setup.
- Update ObjectFileELF to set load addresses using physical addresses. A typical case may be a data section with a physical address in ROM and a virtual address in RAM, which should be loaded to the ROM address.
- Add support for querying the target's qXfer:memory-map, which contains information about flash memory regions, leveraging MemoryRegionInfo data structures with minor modifications
- Update ProcessGDBRemote to use vFlash commands in DoWriteMemory when the target address is in a flash region
- Add a new foundation for testing gdb-remote behaviors by using a mock server that can respond however the test requires
Original discussion at http://lists.llvm.org/pipermail/lldb-dev/2018-January/013093.html
A few questions...
- Leveraging MemoryRegionInfo seemed like the way to go, since qXfer:memory-map results are similar to qMemoryRegionInfo results. But should GetMemoryRegionInfo() be changed to use the qXfer results instead of having the separate new function I added?
- Are the new gdb-remote python tests moving in the right direction? I can add more cases, but wanted to first verify the foundation was acceptable. It's similar to some code in the tools/lldb-server tests, but seemed different enough to justify its own base.