[Bug ld/13899] [avr]: Wrong relaxation of R_AVR_16_PM with gs()

[gjl at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13899

--- Comment #2 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2012-04-27 
23:50:14 UTC ---
Created attachment 6379
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6379
uhr.s

Here is a condensed test case.

The first entry of menuitem_uhr shall contain the word address of onPixel_uhr:

.global    menuitem_uhr
    .section    .progmem.data,"a",@progbits
    .type    menuitem_uhr, @object
menuitem_uhr:
    .word    gs(onPixel_uhr)

But avr-ld generates a wrong entry 0x000a instead of the correct 0x0007.

With the attached assembler file, perform

$ avr-as -mmcu=atmega168 uhr.s -o uhr.o
$ avr-ld -o bug13899.elf -m avr5 -Tdata 0x800100 --relax -defsym morse=0 -v
uhr.o
$ avr-objdump -h -S -j .data -j .text bug13899.elf


The output is:

GNU ld (GNU Binutils) 2.22.52.20120322

bug13899.elf:     file format elf32-avr

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         00000016  00000000  00000000  00000054  2**1
                  CONTENTS, ALLOC, LOAD, READONLY, CODE

Disassembly of section .text:

00000000 <menuitem_uhr>:
   0:    0a 00 06 00 04 00 04 00                             ........

00000008 <__ctors_end>:
   8:    fb df           rcall    .-10         ; 0x0 <menuitem_uhr>

0000000a <onRedraw_uhr>:
   a:    fa df           rcall    .-12         ; 0x0 <menuitem_uhr>
   c:    f9 df           rcall    .-14         ; 0x0 <menuitem_uhr>

0000000e <onPixel_uhr>:
   e:    f8 df           rcall    .-16         ; 0x0 <menuitem_uhr>
  10:    f7 df           rcall    .-18         ; 0x0 <menuitem_uhr>
  12:    f6 df           rcall    .-20         ; 0x0 <menuitem_uhr>
  14:    f5 df           rcall    .-22         ; 0x0 <menuitem_uhr>

The first entry of menuitem_uhr is 0x000a.
The correct value is 0x0007 = 0xe / 2, i.e. the word address of menuitem_uhr.

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