[Bug binutils/14190] New: objdump 2.19 [avr 8] using -d, "lpm" without post-increment incorrectly disassembled with "+"

[Xarquon at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14190

             Bug #: 14190
           Summary: objdump 2.19 [avr 8]  using -d, "lpm" without
                    post-increment incorrectly disassembled with "+"
           Product: binutils
           Version: 2.19
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
        AssignedTo: address@hidden
        ReportedBy: address@hidden
    Classification: Unclassified


Created attachment 6431
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6431
Assembler test file to show "lpm r2,Z" disassembling incorrectly

Hello,
I believe objdump -d (for AVR-8 architecture, any variant) incorrectly
dis-assembles the "lpm" instruction without post-increment of Z register with a
post-increment symbol ("+").  See the AVR Instruction Set manual LPM
description to see the three opcode variations (i, ii, and iii below).  Opcode
varient (ii) should not post-increment Z.

Repro:
[Sample assembly file showing assembled listing]
> avr-as -aln -mmcu=atmega328p avr-objdump-bug.S -o avr-objdump-bug.o
   1 0000 C895                  lpm             ; (i)   implied opcode (r0,Z)   
   2 0002 0490                  lpm     r0,Z    ; (ii)  explicit without
post-increment
   3 0004 0590                  lpm     r0,Z+   ; (iii) explicit with
post-increment
   4 0006 2490                  lpm     r2,Z    ; (ii)  explicit without
post-increment
   5 0008 2590                  lpm     r2,Z+   ; (iii) with post-increment

> avr-objdump -d avr-objdump-bug.o

avr-objdump-bug.o:     file format elf32-avr

Disassembly of section .text:

00000000 <.text>:
   0:   c8 95           lpm
   2:   04 90           lpm     r0, Z+  [INCORRECT]
   4:   05 90           lpm     r0, Z+
   6:   24 90           lpm     r2, Z+  [INCORRECT]
   8:   25 90           lpm     r2, Z+


[NOTE: see how the op-codes differ between 2: and 4: and 6: and 8: (and I
believe are correct), but the instructions are disassembled the same.  I
believe the x4 xx op-codes should not have a post-increment output on the
mnemonic.]

> avr-objdump -v
GNU objdump (WinAVR 20100110) 2.19

Thanks!

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