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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-01-11 19:01:39 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-01-11 19:01:52 -0800 |
| commit | 47acac12c83f173481debc64618626b50ecf7498 (patch) | |
| tree | e48aae92826c2b354a47ca3721c85cfa93b4194e /ld/ld.texinfo | |
| parent | 6181e9c2c5ba252ac016f51903dc35d7bfbbca71 (diff) | |
| download | gdb-47acac12c83f173481debc64618626b50ecf7498.zip gdb-47acac12c83f173481debc64618626b50ecf7498.tar.gz gdb-47acac12c83f173481debc64618626b50ecf7498.tar.bz2 | |
ld: Add "-z separate-code" option to ELF linker
The new "-z separate-code" option will generate separate code LOAD
segment which must be in wholly disjoint pages from any other data.
include/
PR ld/22393
* bfdlink.h (bfd_link_info): Add separate_code.
ld/
PR ld/22393
* NEWS: Mention "-z separate-code".
* emultempl/elf32.em (gld${EMULATION_NAME}_get_script): Get
builtin linker scripts and return linker scripts from disk for
"-z separate-code".
(gld${EMULATION_NAME}_handle_option): Handle "-z separate-code"
and "-z noseparate-code".
* genscripts.sh: Generate linker scripts for "-z separate-code".
(LD_FLAG): Set to *textonly for "-z separate-code".
* ld.texinfo: Document "-z separate-code".
* lexsup.c (elf_shlib_list_options): Add linker help messsages
for "-z separate-code" and "-z noseparate-code".
* scripttempl/elf.sc (SEPARATE_TEXT): New
(TEXT_SEGMENT_ALIGN): Likewise.
Use ${TEXT_SEGMENT_ALIGN} to align and pad text segment to
${MAXPAGESIZE}.
Diffstat (limited to 'ld/ld.texinfo')
| -rw-r--r-- | ld/ld.texinfo | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/ld/ld.texinfo b/ld/ld.texinfo index 4fd12bb..8cd2bed 100644 --- a/ld/ld.texinfo +++ b/ld/ld.texinfo @@ -1264,6 +1264,13 @@ relocation, if supported. Specifying @samp{common-page-size} smaller than the system page size will render this protection ineffective. Don't create an ELF @code{PT_GNU_RELRO} segment if @samp{norelro}. +@item separate-code +@itemx noseparate-code +Create separate code @code{PT_LOAD} segment header in the object. This +specifies a memory segment that should contain only instructions and must +be in wholly disjoint pages from any other data. Don't create separate +code @code{PT_LOAD} segment if @samp{noseparate-code} is used. + @item shstk Generate GNU_PROPERTY_X86_FEATURE_1_SHSTK in .note.gnu.property section to indicate compatibility with Intel Shadow Stack. Supported for |