diff options
Diffstat (limited to 'gas/doc/as.texi')
| -rw-r--r-- | gas/doc/as.texi | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/gas/doc/as.texi b/gas/doc/as.texi index 1a13b5dda42..09b0ca5f565 100644 --- a/gas/doc/as.texi +++ b/gas/doc/as.texi @@ -1897,8 +1897,8 @@ Specify which s390 processor variant is the target, @samp{g5} (or @samp{arch3}), @samp{g6}, @samp{z900} (or @samp{arch5}), @samp{z990} (or @samp{arch6}), @samp{z9-109}, @samp{z9-ec} (or @samp{arch7}), @samp{z10} (or @samp{arch8}), @samp{z196} (or @samp{arch9}), @samp{zEC12} (or @samp{arch10}), -@samp{z13} (or @samp{arch11}), @samp{z14} (or @samp{arch12}), or @samp{z15} -(or @samp{arch13}). +@samp{z13} (or @samp{arch11}), @samp{z14} (or @samp{arch12}), @samp{z15} +(or @samp{arch13}), or @samp{z16} (or @samp{arch14}). @item -mregnames @itemx -mno-regnames Allow or disallow symbolic names for registers. @@ -4355,7 +4355,7 @@ You may not subtract arguments from different sections. @item <= @dfn{Is Less Than Or Equal To} -The comparison operators can be used as infix operators. A true results has a +The comparison operators can be used as infix operators. A true result has a value of -1 whereas a false result has a value of 0. Note, these operators perform signed comparisons. @end table @@ -6186,6 +6186,27 @@ Note: this problem of correctly identifying string parameters to pseudo ops also applies to the identifiers used in @code{.irp} (@pxref{Irp}) and @code{.irpc} (@pxref{Irpc}) as well. +Another issue can occur with the actual arguments passed during macro +invocation: Multiple arguments can be separated by blanks or commas. To have +arguments actually contain blanks or commas (or potentially other non-alpha- +numeric characters), individual arguments will need to be enclosed in either +parentheses @code{()}, square brackets @code{[]}, or double quote @code{"} +characters. The latter may be the only viable option in certain situations, +as only double quotes are actually stripped while establishing arguments. It +may be important to be aware of two escaping models used when processing such +quoted argument strings: For one two adjacent double quotes represent a single +double quote in the resulting argument, going along the lines of the stripping +of the enclosing quotes. But then double quotes can also be escaped by a +backslash @code{\}, but this backslash will not be retained in the resulting +actual argument as then seen / used while expanding the macro. + +As a consequence to the first of these escaping mechanisms two string literals +intended to be representing separate macro arguments need to be separated by +white space (or, better yet, by a comma). To state it differently, such +adjacent string literals - even if separated only by a blank - will not be +concatenated when determining macro arguments, even if they're only separated +by white space. This is unlike certain other pseudo ops, e.g. @code{.ascii}. + @item .endm @cindex @code{endm} directive Mark the end of a macro definition. |