[Bug binutils/21507] New: objdump: Incorrect jump label in disassemble for arm object file

[msmttchr at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21507

            Bug ID: 21507
           Summary: objdump: Incorrect jump label in disassemble for arm
                    object file
           Product: binutils
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: msmttchr at gmail dot com
  Target Milestone: ---

Consider this simple C program:
int g(void)
{
}

int f(void)
{
  g();
}
After compiling it with arm gcc toolchain as follow:

arm-none-eabi-gcc -mthumb -mcpu=cortex-m0 -O0 -g -ffunction-sections -c -o
file.o file.c

You run objdump to see the disassemble of the ELF object file:

objdump -d file.o 

file.o:     file format elf32-littlearm


Disassembly of section .text.g:

00000000 <g>:
   0:   b580            push    {r7, lr}
   2:   af00            add     r7, sp, #0
   4:   46c0            nop                     ; (mov r8, r8)
   6:   0018            movs    r0, r3
   8:   46bd            mov     sp, r7
   a:   bd80            pop     {r7, pc}

Disassembly of section .text.f:

00000000 <f>:
   0:   b580            push    {r7, lr}
   2:   af00            add     r7, sp, #0
   4:   f7ff fffe       bl      0 <f>    <<<<< This label should be <g> >>>>>>
   8:   46c0            nop                     ; (mov r8, r8)
   a:   0018            movs    r0, r3
   c:   46bd            mov     sp, r7
   e:   bd80            pop     {r7, pc}

In function f, the jump instruction 'bl' is showing a label '<f>' as if the
function was calling itself.
In reality the jump label should be '<g>'.

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