Hi,
Στις 2/2/2021 7:33 μ.μ., ο/η Dimitrios Chr. Ioannidis via fpc-devel έγραψε:
Hi,
On 2021-02-02 18:47, Christo Crause wrote:
On Tue, Feb 2, 2021 at 12:28 PM Dimitrios Chr. Ioannidis via fpc-devel
<fpc-devel@lists.freepascal.org> wrote:
Reading dwarf information with avr-embedded-objdump.exe --dwarf
returns
: "avr-embedded-objdump.exe: Warning: Invalid CIE pointer 0x00c80000
in
FDE at 0x000014"
I get the same warning on Linux using avr-objdump (GNU objdump (GNU
Binutils) 2.26.20160125), your test code and all of the dwarf debug
options in the compiler. Not sure if this is really a problem when
debugging with gdb, I've managed to debug across units before. Do you
have a reproducible problematic debug situation that can be tested?
I checked with the dwarf 2.o specification and I read that "in FDE
(Frame Description Entry) there is a CIE_pointer field which is a
uword constant offset into the .debug_frame section that denotes the
CIE that is associated with this FDE."
AFAIU, both are used, among others of course, to provide virtual
unwind information to debugger . But here there is a problem, IMO, the
FDE has an CIE_id of fd39e538 but there is none CIE with that id.
There is only one CIE with id ffffffff .
Correction ! There is only one CIE with id 00000000 not ffffffff ( copy
past error, sorry ).
"dwarf_CIE_FDE_Bug.elf: file format elf32-avr
Contents of the .debug_frame section:
00000000 0010 ffffffff CIE
Version: 1
Augmentation: ""
Code alignment factor: 1
Data alignment factor: -4
Return address column: 24
DW_CFA_def_cfa: r32 ofs 2
DW_CFA_offset_extended: r36 at cfa+0
DW_CFA_nop
00000014 0000 00c80000 FDE cie=fd39e538 pc=0002..0002"
Of course I maybe be wrong and this is not a problem.
regards,
--
Dimitrios Chr. Ioannidis
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