http://sourceware.org/bugzilla/show_bug.cgi?id=15281
Bug #: 15281
Summary: [avr] DWARF CIE DW_CFA_def_cfa offset incorrect for
xmega devices with >128 KB flash
Product: binutils
Version: 2.24 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
The cfa offset definition in the DWARF CIE for xmegas with flash greater th
an
128 KB is 2, instead of 3. For devices with > 128 KB flash, 3 bytes are pus
hed
on the stack as the return address, and hence the value of SP at the call s
ite
(CFA) will be at an offset of 3.
This works correctly for megas with flash >128 KB, as shown below (note the
value of ofs for DW_CFA_def_cfa
➜ scratch cat test.c
int main()
{
return 0;
}
➜ scratch ~/avr/install/bin/avr-gcc -mmcu=atxmega192a3 -c -g3 t
est.c
➜ scratch ~/avr/install/bin/avr-objdump -Wf test.o
test.o: file format elf32-avr
Contents of the .debug_frame section:
00000000 00000010 ffffffff CIE
Version: 1
Augmentation: ""
Code alignment factor: 2
Data alignment factor: -1
Return address column: 36
DW_CFA_def_cfa: r32 ofs 2
DW_CFA_offset: r36 at cfa-1
DW_CFA_nop
DW_CFA_nop
...
➜ scratch ~/avr/install/bin/avr-gcc -mmcu=atmega2560 -c -g3 tes
t.c
➜ scratch ~/avr/install/bin/avr-objdump -Wf test.o
test.o: file format elf32-avr
Contents of the .debug_frame section:
00000000 00000010 ffffffff CIE
Version: 1
Augmentation: ""
Code alignment factor: 2
Data alignment factor: -1
Return address column: 36
DW_CFA_def_cfa: r32 ofs 3
DW_CFA_offset: r36 at cfa-2
DW_CFA_nop
DW_CFA_nop
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