i386: Generate lfence with load/indirect branch/ret [CVE-2020-0551]

[deliverable/binutils-gdb.git] / gas / ChangeLog

diff --git a/gas/ChangeLog b/gas/ChangeLog
index b4b1a3411170262534ee0eee303f97ead6d4782a..19f4bc2cd8b8be40bf1130811c5f8fc59058dabf 100644 (file)
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,31 @@
+2020-03-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+       * config/tc-i386.c (lfence_after_load): New.
+       (lfence_before_indirect_branch_kind): New.
+       (lfence_before_indirect_branch): New.
+       (lfence_before_ret_kind): New.
+       (lfence_before_ret): New.
+       (last_insn): New.
+       (load_insn_p): New.
+       (insert_lfence_after): New.
+       (insert_lfence_before): New.
+       (md_assemble): Call insert_lfence_before and insert_lfence_after.
+       Set last_insn.
+       (OPTION_MLFENCE_AFTER_LOAD): New.
+       (OPTION_MLFENCE_BEFORE_INDIRECT_BRANCH): New.
+       (OPTION_MLFENCE_BEFORE_RET): New.
+       (md_longopts): Add -mlfence-after-load=,
+       -mlfence-before-indirect-branch= and -mlfence-before-ret=.
+       (md_parse_option): Handle -mlfence-after-load=,
+       -mlfence-before-indirect-branch= and -mlfence-before-ret=.
+       (md_show_usage): Display -mlfence-after-load=,
+       -mlfence-before-indirect-branch= and -mlfence-before-ret=.
+       (i386_cons_align): New.
+       * config/tc-i386.h (i386_cons_align): New.
+       (md_cons_align): New.
+       * doc/c-i386.texi: Document -mlfence-after-load=,
+       -mlfence-before-indirect-branch= and -mlfence-before-ret=.
+
 2020-03-11  Nick Clifton  <nickc@redhat.com>
 
        PR 25611