diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/configure.in | 50 | ||||
| -rw-r--r-- | erts/doc/src/notes.xml | 20 | ||||
| -rw-r--r-- | erts/doc/src/persistent_term.xml | 2 | ||||
| -rw-r--r-- | erts/emulator/beam/beam_emu.c | 1 | ||||
| -rw-r--r-- | erts/vsn.mk | 2 |
5 files changed, 73 insertions, 2 deletions
diff --git a/erts/configure.in b/erts/configure.in index bcdc6cd083..4a27b532de 100644 --- a/erts/configure.in +++ b/erts/configure.in @@ -388,6 +388,56 @@ if test X"$with_ets_write_concurrency_locks" != X""; then [Define to override the default number of write_concurrency locks]) fi +AC_ARG_WITH(spectre-mitigation, + AS_HELP_STRING([--with-spectre-mitigation={yes|incomplete}], + [enable spectre mitigation, either fully or with mitigations + disabled in a handful places like the interpreter]) + AS_HELP_STRING([--without-spectre-mitigation], + [build without spectre mitigation]), + [],[with_spectre_mitigation=no]) + +case "$with_spectre_mitigation" in + no) ;; + yes) ;; + incomplete) ;; + *) AC_MSG_ERROR([Invalid spectre mitigation setting]) ;; +esac + +i_noretpoline_attr="" + +if test X"$with_spectre_mitigation" != X"no"; then + CFLAGS="$CFLAGS -mindirect-branch=thunk" + + AC_MSG_CHECKING([for spectre mitigation]) + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([],[return 0;])], + [AC_MSG_RESULT([yes])], + [AC_MSG_ERROR([no])]) + + if test X"$with_spectre_mitigation" = X"incomplete"; then + # gcc and clang support this attribute if they're recent enough. Note + # that we must compile with -Werror to check for actual support as they + # warn rather than error out on unsupported attributes. + + i_noretpoline_attr='__attribute__((__indirect_branch__("keep")))' + i_preserve_cflags="$CFLAGS" + CFLAGS="$CFLAGS -Werror" + + AC_MSG_CHECKING([whether spectre mitigation can be disabled on a per-function basis]) + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([$i_noretpoline_attr],[return 0;])], + [AC_MSG_RESULT([yes])], + [AC_MSG_ERROR([no])]) + + CFLAGS="$i_preserve_cflags" + fi +fi + +AC_DEFINE_UNQUOTED(ERTS_NO_RETPOLINE, $i_noretpoline_attr, + [Per-function attribute for disabling retpoline. This is + *only* defined when --with-spectre-mitigation=incomplete + and has no effects otherwise]) + dnl ---------------------------------------------------------------------- dnl Checks for programs. dnl ---------------------------------------------------------------------- diff --git a/erts/doc/src/notes.xml b/erts/doc/src/notes.xml index f384adcf52..2a823d9fe7 100644 --- a/erts/doc/src/notes.xml +++ b/erts/doc/src/notes.xml @@ -31,6 +31,26 @@ </header> <p>This document describes the changes made to the ERTS application.</p> +<section><title>Erts 10.1.3</title> + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>Added an optional <c>./configure</c> flag to compile + the emulator with spectre mitigation: + <c>--with-spectre-mitigation</c></p> + <p>Note that this requires a recent version of GCC with + support for spectre mitigation and the + <c>--mindirect-branch=thunk</c> flag, such as + <c>8.1</c>.</p> + <p> + Own Id: OTP-15430 Aux Id: ERIERL-237 </p> + </item> + </list> + </section> + +</section> + <section><title>Erts 10.1.2</title> <section><title>Fixed Bugs and Malfunctions</title> diff --git a/erts/doc/src/persistent_term.xml b/erts/doc/src/persistent_term.xml index d2a138d65f..29a6c67051 100644 --- a/erts/doc/src/persistent_term.xml +++ b/erts/doc/src/persistent_term.xml @@ -71,7 +71,7 @@ scan of their heaps for the term that has been deleted. While such scan is relatively light-weight, if there are many processes, the system can become less responsive until all - process have scanned theirs heaps.</p></item> + process have scanned their heaps.</p></item> <item><p>If the deleted term (or any part of it) is still used by a process, that process will do a major (fullsweep) garbage diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c index ab5920a67e..e909a0b4da 100644 --- a/erts/emulator/beam/beam_emu.c +++ b/erts/emulator/beam/beam_emu.c @@ -579,6 +579,7 @@ init_emulator(void) * the instructions' C labels to the loader. * The second call starts execution of BEAM code. This call never returns. */ +ERTS_NO_RETPOLINE void process_main(Eterm * x_reg_array, FloatDef* f_reg_array) { static int init_done = 0; diff --git a/erts/vsn.mk b/erts/vsn.mk index 241d5a3b85..643a8a2e76 100644 --- a/erts/vsn.mk +++ b/erts/vsn.mk @@ -18,7 +18,7 @@ # %CopyrightEnd% # -VSN = 10.1.2 +VSN = 10.1.3 # Port number 4365 in 4.2 # Port number 4366 in 4.3 |