| _comment

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Usually, this symbol is not handled in a special way. However, if it does not exist at all, it is redirected to the entry point of the program. The effect is that constructs of the form

    .word _comment-entry_point

resolve to 0 if the symbol is undefined.
The kernel headers reference this symbol as the comment string of the program. If it exists, it must be a zero-terminated ASCII string.