Broken loader on 7.0-RC1

Nikolay Pavlov qpadla at
Mon Feb 4 13:26:19 UTC 2008

On Monday 04 February 2008 14:37:44 Oliver Fromme wrote:
> Nikolay Pavlov wrote:
>  > While building 7.0-RC1 i've discovered that the loader file is broken
>  > in my box and i am unable to boot using it. I've already hit this
>  > problem 2 months ago. After playing a bit i've found the way on how
>  > to reproduce it easily:
>  >
>  > ~# cd /usr/src/sys/boot/i386
>  > /usr/src/sys/boot/i386# make btx libi386 loader
> I'm afraid I can't reproduce it.  I've tried the exact same
> command, and it built a working loader for me.  Are you
> building on i386 or amd64?  They use the same i386 loader,
> but there are slight differences in the build process.

Thanks for response Oliver. I am very confused about this problem. It looks 
very stupid, but i am completely unable to build a working loader on that 
box. This is amd64 with GENERIC kernel and without any compiler flags in 

> Note that your command does not build ficl nor libstand,
> both of which are required for the loader.  Did you build
> them before?  (However, you should get an error message
> if one of them is missing.)

No i do not see any errors even with pure /usr/obj

> A simple way to check is to use this command:
>     strings loader | grep /src/
> Compare the output for the working and the non-working
> loader.
>  > [...]
>  > client: fmt=elf size=283b0 text=22038 data=4248 bss=60b8 entry=0
> Mine looks like this:
> client: fmt=elf size=3b3b0 text=342d8 data=5248 bss=60d8 entry=0
> Clearly your loader.bin ELF binary (called "client" in BTX
> terms) is much smaller.  Something must be missing.

Yes you are right:

root at cassini:~# diff -u loader.good loader.bad                                                                                                                                                                                       
--- loader.good 2008-02-04 10:46:44.000000000 +0200
+++ loader.bad  2008-02-04 10:47:02.000000000 +0200
@@ -12,22 +12,6 @@

Than it look like Makefile is wrong, because i do not get any errors during 
the building process. 

> You can also check and compare the link commands (that's
> the last "cc" command in the make process, only a few lines
> above the snippet that you posted).  Mine looks like this:
> cc -O2 -fno-strict-aliasing -pipe -DLOADER_NFS_SUPPORT -DBOOT_FORTH
> -I/usr/src/sys/boot/i386/loader/../../ficl
> -I/usr/src/sys/boot/i386/loader/../../ficl/i386 -DLOADER_GZIP_SUPPORT
> -I/usr/src/sys/boot/i386/loader/../../common -I. -Wall
> -I/usr/src/sys/boot/i386/loader/..
> -I/usr/src/sys/boot/i386/loader/../btx/lib -ffreestanding
> -mpreferred-stack-boundary=2  -mno-mmx -mno-3dnow -mno-sse -mno-sse2
> -mno-sse3  -static -Ttext 0x0 -nostdlib -o loader.sym
> /usr/obj/usr/src/sys/boot/i386/loader/../btx/lib/crt0.o main.o conf.o
> vers.o boot.o commands.o console.o devopen.o interp.o interp_backslash.o
> interp_parse.o ls.o misc.o module.o panic.o load_elf32.o
> load_elf32_obj.o reloc_elf32.o load_elf64.o load_elf64_obj.o
> reloc_elf64.o bcache.o isapnp.o pnp.o interp_forth.o
> /usr/obj/usr/src/sys/boot/i386/loader/../../ficl/libficl.a
> /usr/obj/usr/src/sys/boot/i386/loader/../libi386/libi386.a -lstand
> If you're on amd64, there should be additional options
> "-m32 -march=i386 -m elf_i386_fbsd", but other than that
> it should look exactly the same.
> Best regards
>    Oliver

- Best regards, Nikolay Pavlov. <<<-----------------------------------    

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