On Tue, Sep 29, 2020 at 10:03:47AM -0400, Ross Philipson wrote: > On 9/25/20 3:18 PM, Arvind Sankar wrote: > > You will also need to avoid initializing data with symbol addresses. > > > > .long mle_header > > .long sl_stub_entry > > .long sl_gdt > > ... > > > > The other two are more messy, unfortunately there is no easy way to tell > > the linker what we want here. The other entry point addresses (for the > > EFI stub) are populated in a post-processing step after the compressed > > kernel has been linked, we could teach it to also update kernel_info. > > > > Without that, for kernel_info, you could change it to store the offset > > of the MLE header from kernel_info, instead of from the start of the > > image. Actually, kernel_info is currently placed inside .rodata, which is quite a ways into the compressed kernel, so an offset from kernel_info would end up having to be negative, which would be ugly. I'll see if I can come up with some way to avoid this. > > > > For the MLE header, it could be moved to .head.text in head_64.S, and > > initialized with > > .long rva(sl_stub) > > This will also let it be placed at a fixed offset from startup_32, so > > that kernel_info can just be populated with a constant. > > Thank you for the detailed reply. I am going to start digging into this now. > > Ross > > > >
