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Here we introduce the flags that will be used for straight line speculation. The new flag introduced is `-mharden-sls=`. This flag can take arguments of `none`, `all`, or a comma seperated list of one or more of `retbr` or `blr`. `none` indicates no special mitigation of the straight line speculation vulnerability. `all` requests all mitigations currently implemented. `retbr` requests that the RET and BR instructions have a speculation barrier inserted after them. `blr` requests that BLR instructions are replaced by a BL to a function stub using a BR with a speculation barrier after it. Setting this on a per-function basis using attributes or the like is not enabled, but may be in the future. gcc/ChangeLog: 2020-06-02 Matthew Malcomson <matthew.malcomson@arm.com> * config/aarch64/aarch64-protos.h (aarch64_harden_sls_retbr_p): New. (aarch64_harden_sls_blr_p): New. * config/aarch64/aarch64.c (enum aarch64_sls_hardening_type): New. (aarch64_harden_sls_retbr_p): New. (aarch64_harden_sls_blr_p): New. (aarch64_validate_sls_mitigation): New. (aarch64_override_options): Parse options for SLS mitigation. * config/aarch64/aarch64.opt (-mharden-sls): New option. * doc/invoke.texi: Document new option. |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| liboffloadmic | ||
| libphobos | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ar-lib | ||
| ChangeLog | ||
| ChangeLog.jit | ||
| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| multilib.am | ||
| README | ||
| symlink-tree | ||
| test-driver | ||
| ylwrap | ||
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.