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| author | Jan Beulich <jbeulich@suse.com> | 2023-08-25 14:55:12 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2023-08-25 14:55:12 +0200 |
| commit | cefaa117f7675ce690c0ec38c353e7e4195dedcb (patch) | |
| tree | 70932f74748ffb22d3dde9f13a5667acc2064c30 /gas/doc/as.texi | |
| parent | 7b793987b5e1f35a6a8a442da24ebd3f7dbf08f3 (diff) | |
| download | binutils-cefaa117f7675ce690c0ec38c353e7e4195dedcb.zip binutils-cefaa117f7675ce690c0ec38c353e7e4195dedcb.tar.gz binutils-cefaa117f7675ce690c0ec38c353e7e4195dedcb.tar.bz2 | |
gas/ELF: allow "inheriting" section attributes and type
While --sectname-subst is nice, it isn't enough to e.g. mimic
-f{function,data}-sections in assembly code, when such use is to be
optional (e.g. dependent upon some configuration setting).
Assign meaning to '+' and '-' as section attribute letters, allowing
to inherit the prior section's attributes (and possibly type) along
with adding or removing some. Note that documenting the interaction
with '?' as undefined is a precautionary measure.
While touching the function invocation, stop using |= on the result of
obj_elf_parse_section_letters(): "attr" is firmly zero ahead of the
call.
Diffstat (limited to 'gas/doc/as.texi')
| -rw-r--r-- | gas/doc/as.texi | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gas/doc/as.texi b/gas/doc/as.texi index 15867df..6a3e5ee 100644 --- a/gas/doc/as.texi +++ b/gas/doc/as.texi @@ -6818,6 +6818,12 @@ section is a member of a section group section is used for thread-local-storage @item ? section is a member of the previously-current section's group, if any +@item + +section inherits attributes and (unless explicitly specified) type from the +previously-current section, adding other attributes as specified +@item - +section inherits attributes and (unless explicitly specified) type from the +previously-current section, removing other attributes as specified @item R retained section (apply SHF_GNU_RETAIN to prevent linker garbage collection, GNU ELF extension) @@ -6839,6 +6845,12 @@ section may have the executable (@code{x}) flag added. Also note that the @code{.attach_to_group} directive can be used to add a section to a group even if the section was not originally declared to be part of that group. +Note further that @code{+} and @code{-} need to come first and can only take +the effect described here unless overridden by a target. The attributes +inherited are those in effect at the time the directive is processed. +Attributes added later (see above) will not be inherited. Using either +together with @code{?} is undefined at this point. + The optional @var{type} argument may contain one of the following constants: @table @code |