https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214972
Bug ID: 214972
Summary: rtld relies on non-zero _DYNAMIC GOT entry (on
!sparc64)
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: ema...@freebsd.org
Over a decade ago a binutils import broke sparc64 rtld, and it was fixed in
r130661 Quoting from that commit message:
The rtld code tested &_DYNAMIC against 0 to see whether rtld itself
was built as PIC or not. While the sparc64 MD code did not rely
on the preset value of the GOT slot for _DYNAMIC any more due
to previous binutils changes, it still used to not be 0, so
that this check did work. The new binutils do however initialize
this slot with 0. As a consequence, rtld would not properly initialize
itself and crash.
Fix that by introducing a new macro, RTLD_IS_DYNAMIC, to take the role
of this test. For sparc64, it is implemented using the rtld_dynamic()
code that was already there. If an architecture does not provide its
own implementation, we default to the old check.
I have been testing LLD as a linker for FreeBSD, and a recent LLD change (their
r288107) started producing a zeroed GOT on amd64. See http://llvm.org/pr31221.
I don't believe the linker is required to populate the GOT with nonzero values,
so we should probably make a change for all architectures akin to r130661 for
sparc64 .
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