Hi, i had sent this out to help-g...@gnu.org but perhaps its best sent to devel
Im looking for GRUB2's grub-mkimage to produce an efi file for target
execution along with a matching elf file that has all the debug
symbols included so that i can use a debugger to step through the
GRUB2 code. So far i see that strip is used in
grub/grub-core/genmod.sh.in to strip debug sections from the *.o files
as the build generates the *.mod file (i used readelf to verify this
after commenting out the strip command below) Then in grub-mkimage.c,
the generate_image() function appears to make no attempt to preserve
symbols. Is there a way to tell the build system to leave modules and
images with full symbol table and debugging information?
for the image....has anyone modified grub-mkimage.c to retain debug
symbols in generated image?
thanks,
Adrian
####################################### see line 58 of
grub/grub-core/genmod.sh.in where files get stripped
if test x@platform@ != xemu; then
@STRIP@ --strip-unneeded \
-K grub_mod_init -K grub_mod_fini \
-K _grub_mod_init -K _grub_mod_fini \
-R .note -R .comment $tmpfile || exit 1
fi
#######################################
####################################### debug sections have been
stripped in *.mod files
> objdump -h grub-core/fat.mod
grub-core/fat.mod: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000e56 00000000 00000000 00000034 2**2
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
1 .rodata.str1.1 00000099 00000000 00000000 00000e8a 2**0
CONTENTS, ALLOC, LOAD, READONLY, DATA
2 .data 00000024 00000000 00000000 00000f24 2**2
CONTENTS, ALLOC, LOAD, RELOC, DATA
3 .module_license 0000000f 00000000 00000000 00000f48 2**2
CONTENTS, ALLOC, LOAD, DATA
4 .bss 00000004 00000000 00000000 00000f58 2**2
ALLOC
5 .comment.SUSE.OPTs 00000006 00000000 00000000 00000f58 2**0
CONTENTS, READONLY
6 .note.GNU-stack 00000000 00000000 00000000 00000f5e 2**0
CONTENTS, READONLY, CODE
7 .modname 00000004 00000000 00000000 00000f5e 2**0
CONTENTS, READONLY
####################################### debug sections are being
compiled into *.o files
> readelf -e grub-core/fs/fat_module-fat.o
...
...
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 0] NULL 00000000 000000 000000 00 0 0 0
[ 1] .text PROGBITS 00000000 000034 000e56 00 AX 0 0 4
[ 2] .rel.text REL 00000000 0059ec 000348 08 26 1 4
[ 3] .data PROGBITS 00000000 000e8c 000024 00 WA 0 0 4
[ 4] .rel.data REL 00000000 005d34 000038 08 26 3 4
[ 5] .bss NOBITS 00000000 000eb0 000004 00 WA 0 0 4
[ 6] .debug_abbrev PROGBITS 00000000 000eb0 0003ea 00 0 0 1
[ 7] .debug_info PROGBITS 00000000 00129a 0018aa 00 0 0 1
[ 8] .rel.debug_info REL 00000000 005d6c 000fc0 08 26 7 4
[ 9] .debug_line PROGBITS 00000000 002b44 000360 00 0 0 1
[10] .rel.debug_line REL 00000000 006d2c 000008 08 26 9 4
[11] .rodata.str1.1 PROGBITS 00000000 002ea4 000099 01 AMS 0 0 1
[12] .module_license PROGBITS 00000000 002f40 00000f 00 WA 0 0 4
[13] .debug_frame PROGBITS 00000000 002f50 000260 00 0 0 4
[14] .rel.debug_frame REL 00000000 006d34 000100 08 26 13 4
[15] .debug_loc PROGBITS 00000000 0031b0 000e4f 00 0 0 1
[16] .debug_pubnames PROGBITS 00000000 003fff 000036 00 0 0 1
[17] .rel.debug_pubnam REL 00000000 006e34 000008 08 26 16 4
[18] .debug_aranges PROGBITS 00000000 004035 000020 00 0 0 1
[19] .rel.debug_arange REL 00000000 006e3c 000010 08 26 18 4
[20] .debug_ranges PROGBITS 00000000 004055 000060 00 0 0 1
[21] .debug_str PROGBITS 00000000 0040b5 000de1 01 MS 0 0 1
[22] .comment PROGBITS 00000000 004e96 00003a 01 MS 0 0 1
[23] .comment.SUSE.OPT PROGBITS 00000000 004ed0 000006 01 MS 0 0 1
[24] .note.GNU-stack PROGBITS 00000000 004ed6 000000 00 X 0 0 1
[25] .shstrtab STRTAB 00000000 004ed6 000109 00 0 0 1
[26] .symtab SYMTAB 00000000 005440 000390 10 27 36 4
[27] .strtab STRTAB 00000000 0057d0 00021c 00 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings)
I (info), L (link order), G (group), x (unknown)
O (extra OS processing required) o (OS specific), p (processor specific)
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