https://sourceware.org/bugzilla/show_bug.cgi?id=20789
Bug ID: 20789
Summary: [avr] Relaxation does not correctly adjust DIFF reloc
with negative value
Product: binutils
Version: 2.28 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: saaadhu at sourceware dot org
Target Milestone: ---
Addend adjustment for DIFF relocs does not occur if the difference expression
is negative. As seen below, the difference is set correctly to -4 at assembly
time. At link time, relaxation resizes the JMP to RJMP, but the difference in
the linked ELF still stays at -4.
$ cat test.s
.L1:
JMP .L1
.L2:
.section .rodata.b,"a",@progbits
b:
.word .L1-(.L2)
$ avr-as test.s -o test.o -mmcu=avr51 -mlink-relax
$ avr-objdump -s test.o
test.o: file format elf32-avr
Contents of section .text:
0000 0c940000 ....
Contents of section .rodata.b:
0000 fcff ..
$ avr-ld test.o -mavr51 --relax
$ avr-objdump -s a.out
a.out: file format elf32-avr
Contents of section .text:
0000 ffcf ..
Contents of section .data:
800100 fcff ..
Swapping the operands in the label difference (making the expression value
positive) works.
$ cat test.s
.L1:
JMP .L1
.L2:
.section .rodata.b,"a",@progbits
b:
.word .L2-(.L1)
..
$ avr-as test.s -o test.o -mmcu=avr51 -mlink-relax
$ avr-objdump -s test.o
test.o: file format elf32-avr
Contents of section .text:
0000 0c940000 ....
Contents of section .rodata.b:
0000 0400 ..
$ avr-ld test.o -mavr51 --relax
$ avr-objdump -s a.out
a.out: file format elf32-avr
Contents of section .text:
0000 ffcf ..
Contents of section .data:
800100 0200 ..
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