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| author | Jakub Jelinek <jakub@redhat.com> | 2002-02-12 14:50:08 +0000 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2002-02-12 14:50:08 +0000 |
| commit | 2d20f7bf674ff3f0f43842677c70fc2879c5e2c7 (patch) | |
| tree | 486a0034e29b96292c8bc2fbcd053045be1878ea /ld/ld.texinfo | |
| parent | d2c1cacb1ee42bfab028bb553f4017ac54725843 (diff) | |
| download | gdb-2d20f7bf674ff3f0f43842677c70fc2879c5e2c7.zip gdb-2d20f7bf674ff3f0f43842677c70fc2879c5e2c7.tar.gz gdb-2d20f7bf674ff3f0f43842677c70fc2879c5e2c7.tar.bz2 | |
* ldlex.l (DATA_SEGMENT_ALIGN, DATA_SEGMENT_END): New tokens.
* ldgram.y (DATA_SEGMENT_ALIGN, DATA_SEGMENT_END): New tokens.
(exp): Add DATA_SEGMENT_ALIGN (exp, exp) and DATA_SEGMENT_END (exp).
* ldexp.c (exp_data_seg): New variable.
(exp_print_token): Handle DATA_SEGMENT_ALIGN and DATA_SEGMENT_END.
(fold_binary): Handle DATA_SEGMENT_ALIGN.
(exp_fold_tree): Handle DATA_SEGMENT_END.
Pass allocation_done when recursing instead of hardcoding
lang_allocating_phase_enum.
* ldexp.h (exp_data_seg): New.
* ldlang.c (lang_size_sections_1): Renamed from lang_size_sections.
(lang_size_sections): New.
* ld.texinfo (DATA_SEGMENT_ALIGN, DATA_SEGMENT_END): Document.
* scripttempl/elf.sc: Use DATA_SEGMENT_ALIGN and DATA_SEGMENT_END
if COMMONPAGESIZE is defined.
* emulparams/elf_i386.sh (COMMONPAGESIZE): Set to 4K.
* emulparams/elf32_sparc.sh (COMMONPAGESIZE): Set to 8K.
* emulparams/elf64_sparc.sh (COMMONPAGESIZE): Set to 8K.
* emulparams/elf64alpha.sh (COMMONPAGESIZE): Set to 8K.
* emulparams/elf64_ia64.sh (COMMONPAGESIZE): Set to 16K for shared
libraries only.
Diffstat (limited to 'ld/ld.texinfo')
| -rw-r--r-- | ld/ld.texinfo | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/ld/ld.texinfo b/ld/ld.texinfo index 78afbbe..b7c289a 100644 --- a/ld/ld.texinfo +++ b/ld/ld.texinfo @@ -4159,6 +4159,45 @@ This is a synonym for @code{ALIGN}, for compatibility with older linker scripts. It is most often seen when setting the address of an output section. +@item DATA_SEGMENT_ALIGN(@var{maxpagesize}, @var{commonpagesize}) +@kindex DATA_SEGMENT_ALIGN(@var{maxpagesize}, @var{commonpagesize}) +This is equivalent to either +@smallexample +(ALIGN(@var{maxpagesize}) + (. & (@var{maxpagesize} - 1))) +@end smallexample +or +@smallexample +(ALIGN(@var{maxpagesize}) + (. & (@var{maxpagesize} - @var{commonpagesize}))) +@end smallexample +@noindent +depending on whether the latter uses fewer @var{commonpagesize} sized pages +for the data segment (area between the result of this expression and +@code{DATA_SEGMENT_END}) than the former or not. +If the latter form is used, it means @var{commonpagesize} bytes of runtime +memory will be saved at the expense of up to @var{commonpagesize} wasted +bytes in the on-disk file. + +This expression can only be used directly in @code{SECTIONS} commands, not in +any output section descriptions and only once in the linker script. +@var{commonpagesize} should be less or equal to @var{maxpagesize} and should +be the system page size the object wants to be optimized for (while still +working on system page sizes up to @var{maxpagesize}). + +@noindent +Example: +@smallexample + . = DATA_SEGMENT_ALIGN(0x10000, 0x2000); +@end smallexample + +@item DATA_SEGMENT_END(@var{exp}) +@kindex DATA_SEGMENT_END(@var{exp}) +This defines the end of data segment for @code{DATA_SEGMENT_ALIGN} +evaluation purposes. + +@smallexample + . = DATA_SEGMENT_END(.); +@end smallexample + @item DEFINED(@var{symbol}) @kindex DEFINED(@var{symbol}) @cindex symbol defaults |