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The current implementation of the `__rt_sigaction` reference computed an
absolute offset relative to the mapped base of the VDSO. While this can
be handled in the medlow model, the medany model cannot handle this as
it is meant to be position independent. The current implementation
relied on the BFD linker relaxing the PC-relative relocation into an
absolute relocation as it was a near-zero address allowing it to be
referenced relative to `zero`.
We now extract the offsets and create a generated header allowing the
build with LLVM and lld to succeed as we no longer depend on the linker
rewriting address references near zero. This change was largely
modelled after the ARM64 target which does something similar.
Signed-off-by: Saleem Abdulrasool <abdulras@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
fde9c59aeb