https://sourceware.org/bugzilla/show_bug.cgi?id=19091
Bug ID: 19091
Summary: sh: FDPIC linker fails to produce DT_PLTGOT for some
files
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: bugdal at aerifal dot cx
Target Milestone: ---
Created attachment 8688
--> https://sourceware.org/bugzilla/attachment.cgi?id=8688&action=edit
minimal test case
Under some circumstances, the SH/FDPIC linker fails to produce a DT_PLTGOT in
_DYNAMIC for a shared library despite the library containing code which needs a
valid GOT pointer to run. This makes it impossible for the dynamic loader to
load it correctly since it does not have a GOT pointer value to fill into
function descriptors. The attached file is a minimal test case and includes
instructions for assembling/linking in the comments. The circumstance
triggering the error seems to be the complete lack of GOT or PLT relocations
but the presence of static function descriptors. This can happen in a pure-code
library which internally uses or returns function pointers to its own static or
hidden functions.
The problem seems to be in sh_elf_size_dynamic_sections (elf32-sh.c); removing
the "&& htab->sgot->size != 0" condition here makes the linker work correctly
for me:
https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=bfd/elf32-sh.c;h=9fa363615ddbb7629628b7fe500df93d0a27a8b0;hb=HEAD#l3612
However I am not sufficiently familiar with the code to know whether this is
the correct fix or whether it might break other cases.
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