Comments (7)
bebbo
commented on August 11, 2024
I loaded chipbug_bad into a debugger and both symbols are present in chip memory.
What happens is: The linker merges the chip_bss section into the data_bss section, which IMHO is legal.
Disassembly of section .data:
00000000 <_test_data>:
0: 1234 5678
00000004 <_test_bss>:
4: 0000 0000
from amiga-gcc.
jcornwall
commented on August 11, 2024
Hmm. I see both symbols merged into BSS, rather than data, with chipbug_bad.
hunktool -A info chipbug_bad
chipbug_bad (0.0001s) TYPE_LOADSEG
header (segments: first=0, last=1, table size=2)
#000 CODE size 00000004 alloc size 00000004 file header @0000001c data @00000024
symbol #4
00000004 __etext
00000004 ___datadata_relocs
00000000 __stext
00000000 _main
_main:
00000000 7000 moveq #0,d0
00000002 4e75 rts
#001 BSS size 00000008 alloc size 00000008 file header @00000080
symbol #2
00000000 _test_bss
00000004 _test_data
(Objdump doesn't show the BSS segment so I used hunktool here instead.)
from amiga-gcc.
bebbo
commented on August 11, 2024
my output is from m68k-amigaos-objdump -S chipbug_bad
my own tool reports:
> hunkdump.exe chipbug_bad
reading chipbug_bad
hunk 000003f3, HUNK_HEADER, 0
4 sections, 0 - 3
sizes: 5864, 328, 96, 8(c)
hunk 000003e9, HUNK_CODE, 5864
hunk 000003ec, HUNK_RELOC32, 344
hunk 000003f0, HUNK_SYMBOL, 12
HUNK_END
hunk 000003ea, HUNK_DATA, 328
hunk 000003ec, HUNK_RELOC32, 40
hunk 000003f0, HUNK_SYMBOL, 16
HUNK_END
hunk 000003eb, HUNK_BSS, 96
hunk 000003f0, HUNK_SYMBOL, 12
HUNK_END
hunk 000003ea, HUNK_DATA, 8
hunk 000003f0, HUNK_SYMBOL, 12
HUNK_END
So the chip data has a size of 8 bytes has the chip memory attribute.
To verify I loaded it into an Amiga debugger and both chip memory addresses are really in the chip memory.
EDIT:
version info:
GNU ld version 2.14b 20180609-214714
gcc version 6.4.1b 20180616-173350 (GCC)
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bebbo
commented on August 11, 2024
btw you can use objdump to display the sections too:
> m68k-amigaos-objdump.exe -h chipbug_bad
chipbug_bad: file format amiga
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 000016e8 00000000 00000000 0000002c 2**2
CONTENTS, ALLOC, LOAD, RELOC, CODE
1 .data 00000148 00000000 00000000 00002084 2**2
CONTENTS, ALLOC, LOAD, RELOC, DATA
2 .bss 00000060 00000000 00000000 000022c8 2**2
ALLOC
3 .data 00000008 00000000 00000000 000023d4 2**2
CONTENTS, ALLOC, LOAD, DATA
from amiga-gcc.
jcornwall
commented on August 11, 2024
Looks like my amiga-gcc update attempt failed. It seems I still have a May 4th build (not too old but maybe something changed?) and it generates this:
chipbug_bad: file format amiga
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000004 00000000 00000000 00000024 2**2
CONTENTS, ALLOC, LOAD, CODE
1 .bss 00000008 00000000 00000000 00000088 2**2
ALLOC```
I tried doing a 'make clean' and 'make' but end up with:
m68k-amigaos-gcc -Os -DCHIP_BSS -o chipbug_bad chipbug.c
/home/jay/env/m68k-amigaos/lib/gcc/m68k-amigaos/6.4.1b/../../../../m68k-amigaos/bin/ld: cannot open crt0.o: No such file or directory
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bebbo
commented on August 11, 2024
git pull
make update -j
make all
should do it - if the result is not ok go the long way:
git pull
make clean clean-prefix update -j
make all
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jcornwall
commented on August 11, 2024
Yep, that worked! It seems that bug was indeed fixed in the last month.
I think using -j broke my update, because I tried it again after a clean and it finished very quickly. I then cleaned again and started without -j and it spent a lot longer rebuilding everything. I'll be sure to clean and build single threaded in future.
Thanks for the help.
from amiga-gcc.
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