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docs/emulation: expand warning about semihosting 

A surprising feature of calls like SYS_READC is this can cause QEMU to
indefinitely block as there is no handling for EOF.

Clarifies: https://gitlab.com/qemu-project/qemu/-/issues/1963
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231120150833.2552739-8-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2023-11-20 15:08:26 +00:00
parent 1be75e24e8
commit ef073ebd32
1 changed files with 3 additions and 2 deletions
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5
docs/about/emulation.rst
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@ -129,8 +129,9 @@ causing most hypervisors to trap and fault on them.
.. warning::
Semihosting inherently bypasses any isolation there may be between
the guest and the host. As a result a program using semihosting can
happily trash your host system. You should only ever run trusted
code with semihosting enabled.
happily trash your host system. Some semihosting calls (e.g.
``SYS_READC``) can block execution indefinitely. You should only
ever run trusted code with semihosting enabled.
Redirection
~~~~~~~~~~~