Now that we track RA_SIGN_STATE and get the pointer authentication code
mask, we can remove the pointer authentication code from the return
address while unwinding. Add a new architecture callback,
->demangle_return_address(), for this purpose.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
The RA_SIGN_STATE pseudo-register indicates whether the return address
is signed with a pointer authentication code. Add it to the register
definitions. It can be set through a normal CFI register rule or the
vendor-specific DW_CFA_AARCH64_negate_ra_state rule.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
Add the basic register definitions and stack unwinding support
functions. Pointer authentication support will be added in subsequent
commits.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
The only relocation types I saw in Debian's kernel module debug info
were R_AARCH64_ABS64 and R_AARCH64_ABS32. R_AARCH64_ABS16,
R_AARCH64_PREL64, R_AARCH64_PREL32, and R_AARCH64_PREL16 are all easy.
The remaining types supported by the Linux kernel are for movw and
immediate instructions, which aren't relevant to debug info.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
