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8128b3e079
In semihosting mode QEMU allows guest to read and write host file descriptors directly, including descriptors 0..2, a.k.a. stdin, stdout and stderr. Sometimes it's desirable to have semihosting console controlled by -serial option, e.g. to connect it to network. Add semihosting console to xtensa-semi.c, open it in the 'sim' machine in the presence of -serial option and direct stdout and stderr to it when it's present. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>