https://sourceware.org/bugzilla/show_bug.cgi?id=28686
Bug ID: 28686
Summary: [avr] linker relaxations generate incorrect value
Product: binutils
Version: 2.37
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: j at uriah dot heep.sax.de
Target Milestone: ---
This appears to be similar to
https://www.sourceware.org/bugzilla/show_bug.cgi?id=20545
However, as that one is "resolved fixed", opening a new bug instead.
In a setup with an assembler file requesting alignment for a particular block
of code, the ZH value for that block of code is miscalculated when linker
relaxations are requested.
Without linker relaxations, the correct code is generated.
Testcode:
.rept 300
call test
.endr
clr ZL
ldi ZH,hi8(matrix)
1:rjmp 1b
test:
ret
.balign 256
matrix:
.byte 1,2,3,4,5
Compiler (i.e. combined assembler+linker) commandline:
avr-gcc main.S -o main.elf -mmcu=atmega328 -nostartfiles -mrelax
Without -mrelax, ZH is (correctly) loaded with 5, as matrix is located at
0x500. With -mrelax, as there are 300 CALL instructions turned into RCALLs,
matrix is located at 0x300, yet the value loaded into ZH becomes 2 rather than
3.
Cross reference:
https://www.mikrocontroller.net/topic/528827
(German-language forum discussion the bug has been reported to originally.)
--
You are receiving this mail because:
You are on the CC list for the bug.
