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Targets can contain a semihosting implementation that provides
libc functionality. Applications can use this functionality without a simulated operating system.
Such an implementation can be enabled using suitable CPU parameters. No external interface is
involved in making it work. However, the concept of offloading work from the
simulation to the host is generic and can be used beyond the
set of functions.
Functions that need to return more data than an integer should write it directly into memory using
memory_write(). A buffer consisting of a memory address and length is usually passed to the called function as an argument for this purpose.