[uml-devel] What's different about building for x86-64?

[Rob Landley <rob@landley.net>]

Daving Lang grabbed my firmware-linux build script and tried to build it on 
x86-64, and it barfed trying to compile User Mode Linux:

gcc -Wall -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing 
-fno-common -ffreestanding -O2 -fomit-frame-pointer -D__arch_um__ 
-DSUBARCH=\"x86_64\" -Dvmap=kernel_vmap -Iarch/um/include 
-I/root/firmware-build-0.8.9/tmpdir/linux-2.6.13.2/arch/um/kernel/tt/include 
-I/root/firmware-build-0.8.9/tmpdir/linux-2.6.13.2/arch/um/kernel/skas/include 
-fno-builtin -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -S -o 
arch/um/user-offsets.s arch/um/sys-x86_64/user-offsets.c
arch/um/sys-x86_64/user-offsets.c: In function `foo':
arch/um/sys-x86_64/user-offsets.c:24: error: structure has no member named 
`rbx'
arch/um/sys-x86_64/user-offsets.c:25: error: structure has no member named 
`rcx'
...
and so on.

My build is basically extracting the 2.6.14 tarball, adding the squashfs 
patch, and then doing this:

make ARCH=um O=../linux-build allnoconfig &&
cd ../linux-build &&
cat >> .config << EOF &&
CONFIG_MODE_SKAS=y
CONFIG_BINFMT_ELF=y
CONFIG_HOSTFS=y
CONFIG_SYSCTL=y
CONFIG_STDERR_CONSOLE=y
CONFIG_UNIX98_PTYS=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_BLK_DEV_UBD=y
CONFIG_TMPFS=y
CONFIG_SWAP=y
CONFIG_LBD=y
CONFIG_EXT2_FS=y
CONFIG_PROC_FS=y
CONFIG_SQUASHFS=y
CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3
CONFIG_ZLIB_INFLATE=y
EOF
yes "" | make ARCH=um oldconfig &&
make ARCH=um &&

It's not working, and I don't have an x86-64 machine to test this on.  I can 
only assume the config file is wrong, but it's in a way that oldconfig isn't 
fixing...

I don't know quite how ARCH=um figures out whether it's derived from ARCH=i386 
or ARCH=x86-64...

Rob


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