diff options
| -rw-r--r-- | gas/ChangeLog | 10 | ||||
| -rw-r--r-- | gas/doc/as.texinfo | 32 |
2 files changed, 28 insertions, 14 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index 6541eab..0d723bb 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,13 @@ +2017-03-20 Nick Clifton <nickc@redhat.com> + + * doc/as.texinfo (2byte): Note that if no expressions are present + the directive does nothing. Emphasize that the output is + unaligned, and that this can have an effect on the relocations + generated. + (4byte): Simplify description. Refer back to the 2byte + description. + (8byte): Likewise. + 2017-03-20 Richard Earnshaw <rearnsha@arm.com> * config/tc-arm.c (arm_fpus): Note entires that should not be diff --git a/gas/doc/as.texinfo b/gas/doc/as.texinfo index 3b3e931..56a38bf 100644 --- a/gas/doc/as.texinfo +++ b/gas/doc/as.texinfo @@ -7345,10 +7345,19 @@ instead of zero. Using @samp{.zero} in this way would be confusing however. @cindex two-byte integer @cindex integer, 2-byte -This directive expects zero or more expressions, separated by commas. Each -expression is evaluated and placed in the next two bytes of the current -section. If an expression will not fit in two bytes, a warning message -is displayed and the lowest two bytes of the expression's value are used. +This directive expects zero or more expressions, separated by commas. If there +are no expressions then the directive does nothing. Otherwise each expression +is evaluated in turn and placed in the next two bytes of the current output +section, using the endian model of the target. If an expression will not fit +in two bytes, a warning message is displayed and the least significant two +bytes of the expression's value are used. If an expression cannot be evaluated +at assembly time then relocations will be generated in order to compute the +value at link time. + +This directive does not apply any alignment before or after inserting the +values. As a result of this, if relocations are generated, they may be +different from those used for inserting values with a guaranteed alignment. + This directive is only available for ELF targets, @node 4byte @@ -7357,11 +7366,8 @@ This directive is only available for ELF targets, @cindex four-byte integer @cindex integer, 4-byte -This directive expects zero or more expressions, separated by commas. Each -expression is evaluated and placed in the next four bytes of the current -section. If an expression will not fit in four bytes, a warning message -is displayed and the lowest four bytes of the expression's value are used. -This directive is only available for ELF targets, +Like the @option{.2byte} directive, except that it inserts unaligned, four byte +long values into the output. @node 8byte @section @code{.8byte @var{expression} [, @var{expression}]*} @@ -7369,11 +7375,9 @@ This directive is only available for ELF targets, @cindex eight-byte integer @cindex integer, 8-byte -This directive expects zero or more expressions, separated by commas. Each -expression is evaluated and the resulting bignum is placed in the next eight -bytes of the current section. If an expression will not fit in eight bytes, a -warning message is displayed and the lowest eight bytes of the expression's -value are used. This directive is only available for ELF targets, +Like the @option{.8byte} directive, except that it inserts unaligned, eight +byte long bignum values into the output. + @end ifset @node Deprecated |