Helllo,
I am upgrading our uClinux distribution from 2.4.22 to 2.4.34, using the latest
releases (or I think so: uClinux-dist-20080808.tar.gz and
m68k-uclinux-tools-20061214.sh), for our 5272-based custom board.
The kernel compilation finally went fine after I included the different bits
related to our board (specific drivers, minor hacks, and userland utilities).
We also have a quite large C++ application (circa half a meg, binary size)
which is compiled apart from the uClinux tree, plus a smaller one (22k).
The smaller one compiles and runs fine. It uses the same compilation switches
as the bigger one.
The bigger one either won't pass the compilation step or won't run:
* if I append the -msep-data flag, the program can be built. However when I run
it, I get "BINFMT_FLAT: reloc outside program" errors, followed by a SIGSEGV
* if I don't use that switch, the compiler issues a " text=0x85c20 overlaps
data=0x0" error.
Help has been requested here a few times for both issues:
* adding the -msep-data switch is wrong, for I use m68k and gcc 4.1.1
* The runtime relocation error is often the consequence of libraries built with
-msep-data.
So I leave the -msep-data switch out, and focus on the compile-time error.
The only external lib I use is uClibc. Someone advised here to edit config.arch
in our vendors directory, in order to disable XIP and shared libraries. I have
un-commented these lines:
DISABLE_XIP = 1
DISABLE_MOVE_RODATA = 1 (for this one I tried both to enable and disable)
DISABLE_SHARED_LIB = 1
For each test, I do a "make clean" and rebuild. Same for my program.
The most puzzling thing is that the m68k-uclinux-objdump output shows correct
figures, AFAICT (see below)
I ran out of clues. Any help appreciated.
Regards.
---
* compilation:
* (parts)
m68k-uclinux-g++ -m5307 obj.cpp -c -NDEBUG -I/home/my/uClinux-dist/include
-Wall ->overloaded-virtual -o obj.o
* (final
m68k-uclinux-g++ -m5307 -L/home/my/uClinux-dist/uClibc/ -lc -lgcc -lstdc++
-Wl,-elf2flt lots.o of.o obj.o files.o -o myprog
ERROR: text=0x85c20 overlaps data=0x0
collect2: ld returned 1 exit status
* objdump:
m68k-uclinux-objdump -h myprog.elf ( main sections)
Idx Name Size VMA LMA File
off Algn
303 .text 00085c20 00000000 00000000
000009cac 2**2
607 .data 0000d7a0 00085c20 00085c20
000887f0 2**2
608 .bss 00001380 000933c0 000333c0
00095f90 2**0
609 .stack 00000000 00000008 00000008 00095f90
2**0
m68k-uclinx-objdump -h myprog.gdb (gives other figures)
Idx Name Size VMA LMA File
off Algn
0 .text 00087700 00000000 00000000 0002000
2**2
1 .data 0000de30 00087700 00087700
00089700 2**2
2 .bss 00001380 00095530 00095530
00097530 2**2
3 .stack 00000000 00000000 00000000 00097530
2**0
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