tree 49ecdb66af7b7591076aa62c8acc2c7e2e56d1a8
parent 4ff78e0dbcd5c795962567fdc1b31e9e03c55b07
author Aurelien Jarno <aurelien@aurel32.net> 1376582279 +0200
committer Aurelien Jarno <aurelien@aurel32.net> 1378164886 +0200

tcg/mips: detect available host instructions at runtime

Now that TCG supports enabling and disabling ops at runtime, it's
possible to detect the available host instructions at runtime, and
enable the corresponding ops accordingly.

Unfortunately it's not easy to probe for available instructions on
MIPS, the information is partially available in /proc/cpuinfo, and
not available in AUXV. This patch therefore probes for the instructions
by trying to execute them and by catching a possible SIGILL signal.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>