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describe --emulation option

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Ken Raeburn
1995-06-28 23:10:41 +00:00
parent 4a9983089e
commit ba5ceb3060
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gas/doc/as.texinfo
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@ -230,6 +230,7 @@ Here is a brief summary of how to invoke @code{@value{AS}}. For details,
[ -nocpp ] [ -EL ] [ -EB ] [ -G @var{num} ] [ -mcpu=@var{CPU} ]
[ -mips1 ] [ -mips2 ] [ -mips3 ] [ -m4650 ] [ -no-m4650 ]
[ --trap ] [ --break ]
[ --emulation=@var{name} ]
@end ifset
[ -- | @var{files} @dots{} ]
@end smallexample
@ -439,6 +440,31 @@ instructions around accesses to the @samp{HI} and @samp{LO} registers.
Generate code for a particular MIPS cpu. This has little effect on the
assembler, but it is passed by @code{@value{GCC}}.
@cindex emulation
@item --emulation=@var{name}
This option causes @code{@value{AS}} to emulated @code{@value{AS}} configured
for some other target, in all respects, including output format (choosing
between ELF and ECOFF only), handling of pseudo-opcodes which may generate
debugging information or store symbol table information, and default
endianness. The available configuration names are: @samp{mipsecoff},
@samp{mipself}, @samp{mipslecoff}, @samp{mipsbecoff}, @samp{mipslelf},
@samp{mipsbelf}. The first two do not alter the default endianness from that
of the primary target for which the assembler was configured; the others change
the default to little- or big-endian as indicated by the @samp{b} or @samp{l}
in the name. Using @samp{-EB} or @samp{-EL} will override the endianness
selection in any case.
This option is currently supported only when the primary target
@code{@value{AS}} is configured for is a MIPS ELF or ECOFF target.
Furthermore, the primary target or others specified with
@samp{--enable-targets=@dots{}} at configuration time must include support for
the other format, if both are to be available. For example, the Irix 5
configuration includes support for both.
Eventually, this option will support more configurations, with more
fine-grained control over the assembler's behavior, and will be supported for
more processors.
@item -nocpp
@code{@value{AS}} ignores this option. It is accepted for compatibility with
the native tools.