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Diffstat (limited to 'gas/doc')
| -rw-r--r-- | gas/doc/c-s390.texi | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gas/doc/c-s390.texi b/gas/doc/c-s390.texi index 7971327..76dc144 100644 --- a/gas/doc/c-s390.texi +++ b/gas/doc/c-s390.texi @@ -873,6 +873,19 @@ restored with @code{.machine pop}. Be aware that the cpu string has to be put into double quotes in case it contains characters not appropriate for identifiers. So you have to write @code{"z9-109"} instead of just @code{z9-109}. + +@cindex @code{.machinemode} directive, s390 +@item .machinemode string +This directive allows to change the architecture mode for which code +is being generated. @code{string} may be @code{esa}, @code{zarch}, +@code{zarch_nohighgprs}, @code{push}, or @code{pop}. +@code{.machinemode zarch_nohighgprs} can be used to prevent the +@code{highgprs} flag from being set in the ELF header of the output +file. This is useful in situations where the code is gated with a +runtime check which makes sure that the code is only executed on +kernels providing the @code{highgprs} feature. +@code{.machinemode push} saves the currently selected mode, which may +be restored with @code{.machinemode pop}. @end table @node s390 Floating Point |