https://sourceware.org/bugzilla/show_bug.cgi?id=28789
Bug ID: 28789
Summary: RISC-V: ld resolves absolute symbols via PC-relative
relocations for position-independent targets
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: palmer at gcc dot gnu.org
Target Milestone: ---
Created attachment 13911
--> https://sourceware.org/bugzilla/attachment.cgi?id=13911&action=edit
First shot at a patch
During a recent discussion on the psABI spec, it came up that we're allowing
absolute symbols to be resolved via PC-relative addressing sequences when
linked into position-independent targets. This may not produce the expected
answer at runtime, which is not particularly friendly for users.
I've attached a patch that resolves some of these issues, but see the big FIXME
related to absolute symbols defined by linker scripts. I'm not sure what the
expected behavior is there, but x86 is explicitly treating these as resolvable
via PC-relative relocations and that's not what I'd expect so I'm assuming I'm
missing something. Our GP initialization sequences are also using absolute
addresses in this way, which is at best worrisome.
Given how late we are in the 2.38 cycle and how tricky absolute symbols are, I
think it's best if we hold off on doing anything for now.
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