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[Bug ld/25616] New: --fix-v4bx does not work

From: gary at partis dot co.uk
Subject: [Bug ld/25616] New: --fix-v4bx does not work
Date: Sat, 29 Feb 2020 19:26:33 +0000


            Bug ID: 25616
           Summary: --fix-v4bx does not work
           Product: binutils
           Version: 2.31
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: gary at partis dot co.uk
  Target Milestone: ---

Created attachment 12327
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12327&action=edit
Tar file containing object and library files to be linked


I am using GNU ld version 2.31.1 to target ARMv3 (ARM610/710) processors.
Primarily, GCC's libgcc contains "BX LR" instructions which we want changed to
"MOV PC,LR" so to be compatible with older processors, but after running the
linker with the "--fix-vxb4" directive the BX instructions are still there (we
use objdump to disassemble the resultant ELF file to check).

Attached is a tar containing some object and library files. They are linked
thus :

arm-eabi-ld --fix-v4bx -static -nostdlib --format elf32-littlearm --relocatable
OS_FuncMain.o StringUtils.o --start-group StringUtils.a ANSIC.a OS.a libgcc.a
--end-group -o StringUtils.elf

Then a check is made :

arm-eabi-objdump StringUtils.elf --disassemble-all --all-headers | grep -i bx

...and the "bx lr" instructions are still there instead of the "mov pc,lr".

Kind regards

Gary Partis

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