Linux

(v4.12 – 2017-July)

Let’s refer to the source of the newuname system call.

Tracking this down is complicated by the fact that Linux has UTS namespaces, but the init_uts_ns machine field is initialized by the UTS_MACHINE macro, which is defined per-architecture.

Further complicating matters, machine can be overridden via override_architecture(), if the process is running under a 32-bit “compat” personality, to COMPAT_UTS_MACHINE.

UTS_MACHINE defaults in Makefile to the same thing as ARCH. However, many platforms have separate sub-architectures under the same arch directory, so they set UTS_MACHINE themselves

With the list of directories in arch/ and a little grep-ing of the Linux kernel sources (git grep 'UTS_MACHINE\s*:=' and git grep COMPAT_UTS_MACHINE), we can arrive at this list:

• alpha

• arc

• arm

• aarch64_be (arm64)
• aarch64 (arm64)
• armv8b (arm64 compat)

• armv8l (arm64 compat)

• blackfin

• c6x
• cris
• frv
• h8300
• hexagon
• ia64
• m32r
• m68k
• metag
• microblaze
• mips (native or compat)
• mips64 (mips)
• mn10300
• nios2
• openrisc
• parisc (native or compat)
• parisc64 (parisc)
• ppc (powerpc native or compat)
• ppc64 (powerpc)
• ppcle (powerpc native or compat)
• ppc64le (powerpc)
• s390 (s390x compat)
• s390x
• score
• sh
• sh64 (sh)
• sparc (native or compat)
• sparc64 (sparc)
• tile
• unicore32
• i386 (x86)
• i686 (x86 compat)
• x86_64 (x64)
• xtensa