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Experimental version of QEMU with basic support for ARM TrustZone (security extensions)
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…stems. Semihosting can be useful in both worlds of a TrustZone system. This patch introduces the "-semihosting-model" command line option, to select on of four usage models ("compat", "secure", "normal", "both") for semihosting. The "compat" model is selected as default, when no "-semihosting-model" command line option is present. In compatibility mode semihosting is available in secure and normal worlds, while any use of the SMC instructions aborts the simulation. The "secure", "normal" and "both" usage models allow selective activation of semihosting in one or both worlds of a TrustZone system. The SMC instruction is allowed by all of three TrustZone-aware usage models.
Read the documentation in qemu-doc.html or on http://wiki.qemu.org - QEMU team