Add support for walking s390x page tables. This supports
up to 5 level page table walking and huge/large pages. In order
to figure out the level of paging used, we read the first entry
of the pgd, which is always mapped for lowcore access and use the
level bits of the next page table. This is because drgn passes mm::pgd
as pgtable argument to the walker function which doesn't contain the
ASCE bits.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
The only relocation type I saw in Debian's kernel module debug info was
R_390_32. R_390_8, R_390_16, R_390_64, R_390_PC16, R_390_PC32, and
R_390_PC64 are trivial to support, as well. The Linux kernel supports
many more, but hopefully they won't show up for debug info.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
