https://sourceware.org/bugzilla/show_bug.cgi?id=25569
Bug ID: 25569
Summary: PDP11 ld -s clobbers last data byte
Product: binutils
Version: 2.35 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: casner at acm dot org
Target Milestone: ---
Created attachment 12294
--> https://sourceware.org/bugzilla/attachment.cgi?id=12294&action=edit
Proposed patch
When the -s option is supplied to ld for pdp11-aout target to suppress writing
the symbol table, the last byte of the .data section is overwritten with 0.
There is code explicitly written to do this near the end of the final_link
function in bfd/pdp11.c. It appears that the intention of that code was to pad
with 0 for a .data section of odd length, but the last data byte is overwritten
when the length is even. Furthermore, in normal usage the length is always
even because gas pads the .data section in an object file if it is odd.
For testing, and odd-length .data section can be forced with a linker script
that appends one byte.
I am attaching a proposed fix that checks for the file length being odd using
the bfd->where member and only appends the 0 pad byte in that case.
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