We have some generic helpers that we'd like to add (for example, #210)
that need to know the stack pointer of a frame. These shouldn't need to
hard-code register names for different architectures. Add a generic
shortcut, StackFrame.sp.
Signed-off-by: Omar Sandoval <osandov@osandov.com>
drgn is currently licensed as GPLv3+. Part of the long term vision for
drgn is that other projects can use it as a library providing
programmatic interfaces for debugger functionality. A more permissive
license is better suited to this goal. We decided on LGPLv2.1+ as a good
balance between software freedom and permissiveness.
All contributors not employed by Meta were contacted via email and
consented to the license change. The only exception was the author of
commit c4fbf7e589 ("libdrgn: fix for compilation error"), who did not
respond. That commit reverted a single line of code to one originally
written by me in commit 640b1c011d ("libdrgn: embed DWARF index in
DWARF info cache").
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>
