On 2008-Oct-30 18:08:35 +0200, Andriy Gapon wrote:
>1. obtain and extract
>http://www.memtest.org/download/2.01...6+-2.01.bin.gz


This is a compressed bootable image and can't be compiled. Possibly
you mean http://www.memtest.org/download/2.01...6+-2.01.tar.gz

>2. run gmake:
>$ gmake
>gcc -E -traditional head.S -o head.s
>as -32 -o head.o head.s
>gcc -c -Wall -march=i486 -m32 -Os -fomit-frame-pointer -fno-builtin
>-ffreestanding -fPIC -fno-strict-aliasing reloc.c
>gcc -Wall -march=i486 -m32 -Os -fomit-frame-pointer -fno-builtin
>-ffreestanding -fPIC -c -o main.o main.c
>gcc -c -Wall -march=i486 -m32 -Os -fomit-frame-pointer -fno-builtin
>-ffreestanding test.c


Blows up at this point for me:
gcc -c -Wall -march=i486 -m32 -Os -fomit-frame-pointer -fno-builtin -ffreestanding test.c
test.c:14:20: error: sys/io.h: No such file or directory
test.c: In function 'beep':
test.c:1410: warning: implicit declaration of function 'outb_p'
test.c:1410: warning: implicit declaration of function 'inb_p'
test.c:1417: warning: implicit declaration of function 'outb'
gmake: *** [test.o] Error 1

I can't find in CVS or any declarations for outb_p or inb_p
in my source tree.

>ld --warn-constructors --warn-common -static -T memtest_shared.lds \
> -o memtest_shared head.o reloc.o main.o test.o init.o lib.o
>patn.o screen_buffer.o config.o linuxbios.o memsize.o pci.o controller.o
>random.o extra.o spd.o error.o dmi.o && \
> ld -shared -Bsymbolic -T memtest_shared.lds -o memtest_shared
>head.o reloc.o main.o test.o init.o lib.o patn.o screen_buffer.o
>config.o linuxbios.o memsize.o pci.o controller.o random.o extra.o spd.o
>error.o dmi.o
>head.o(.text+0x7): In function `startup_32':
>: undefined reference to `_GLOBAL_OFFSET_TABLE_'
>Segmentation fault (core dumped)
>gmake: *** [memtest_shared] Error 139


I can't help here. _GLOBAL_OFFSET_TABLE_ is related to the binutils
PIC support and it appears that the linker doesn't like the code (in
head.S) is explicitly referencing it.

>Not only linking fails, but ld even crashes.


I agree this shouldn't happen.

>Can anybody suggest anything about this problem?


It looks like stand-alone PIC code on FreeBSD needs some different
incantations to Linux. My understanding is that several of the
i386 bootstraps are relocatable so you might like to peruse the
code in /usr/src/sys/boot/i386 for ideas.

--
Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.

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