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[/] [openrisc/] [trunk/] [or1ksim/] [doc/] [or1ksim.texi] - Diff between revs 472 and 486
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@item l.nop 9
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@item l.nop 9
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@cindex @code{l.nop 9} (turn off tracing)
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@cindex @code{l.nop 9} (turn off tracing)
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Instruction tracing is turned off.
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Instruction tracing is turned off.
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@item l.nop 10
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@cindex @code{l.nop 10} (return a random number)
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A 32-bit random number is returned in @code{r11}.
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The random numbers are generated using @code{random}, which in turn is
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seeded through @code{srandom} using the host @file{/dev/urandom} if
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available, or else the process ID of the @value{OR1KSIM} instance.
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This opcode is particularly useful for situations where a target
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program running on Or1ksim needs to obtain genuine system entropy to
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generate random numbers.
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@item l.nop 11
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@cindex @code{l.nop 11} (return a non-zero value)
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Return a non-zero value in @code{r11}.
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This opcode can be used to detect if a target is running under
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Or1ksim. Set @code{r11} to zero, issue this opcode, and look to see
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if @code{r11} is non-zero.
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@end table
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@end table
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@node Configuration
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@node Configuration
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@chapter Configuration
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@chapter Configuration
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@cindex configuring @value{OR1KSIM}
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@cindex configuring @value{OR1KSIM}
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