binutils: Add -momit-lock-prefix support

This patch is needed for certain cpus and has been accepted into upstream

(From OE-Core rev: 3371b42a4ac5becb063157f1b258918601211ebf)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 237 insertions, 0 deletions

diff --git a/meta/recipes-devtools/binutils/binutils-2.24.inc b/meta/recipes-devtools/binutils/binutils-2.24.inc
index 2fb56eb4af..e71a110d34 100644
--- a/meta/recipes-devtools/binutils/binutils-2.24.inc
+++ b/meta/recipes-devtools/binutils/binutils-2.24.inc
@@ -41,6 +41,7 @@ SRC_URI = "\
      file://binutils_CVE-2014-8504.patch \
      file://binutils_CVE-2014-8737.patch \
      file://Fix-tc-i386.c-Werror-logical-not-parentheses-error.patch \
+     file://0001-Add-momit_lock_prefix-no-yes-option.patch \
      "
 
 SRC_URI[md5sum] = "e0f71a7b2ddab0f8612336ac81d9636b"
diff --git a/meta/recipes-devtools/binutils/binutils/0001-Add-momit_lock_prefix-no-yes-option.patch b/meta/recipes-devtools/binutils/binutils/0001-Add-momit_lock_prefix-no-yes-option.patch
new file mode 100644
index 0000000000..e56891f9f3
--- /dev/null
+++ b/meta/recipes-devtools/binutils/binutils/0001-Add-momit_lock_prefix-no-yes-option.patch
@@ -0,0 +1,236 @@
+From ee57d586166f36f4a6bddaa2305fd66a7752f967 Mon Sep 17 00:00:00 2001
+From: Ilya Tocar <ilya.tocar@intel.com>
+Date: Fri, 1 Aug 2014 17:58:32 +0400
+Subject: [PATCH] Add -momit_lock_prefix=[no|yes] option
+
+This option serves as a workaround for processors, which fail on lock
+prefix.
+
+gas/
+        * config/tc-i386.c (omit_lock_prefix): New.
+        (output_insn): Omit lock prefix if omit_lock_prefix is true.
+        (OPTION_omit_lock_prefix): New.
+        (md_longopts): Add momit-lock-prefix.
+        (md_parse_option): Handle momit-lock-prefix.
+        (md_show_usage): Add momit-lock-prefix=[no|yes].
+        * doc/c-i386.texi (momit-lock-prefix): Document.
+
+gas/testsuite/
+
+        * gas/i386/i386.exp: Run new tests.
+        * gas/i386/omit-lock-no.d: New.
+        * gas/i386/omit-lock-yes.d: Ditto.
+        * gas/i386/omit-lock.s: Ditto.
+
+Cherry-pick from git://sourceware.org/git/binutils-gdb.git
+rev d022bddd4fd93428a7fa3cc7ad404c912ed20dbf
+into binutils v2.24
+
+Upstream-Status: [Accepted]
+Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
+Signed-off-by: Saul Wold <sgw@linux.intel.com>
+---
+ gas/ChangeLog                          |   10 ++++++++++
+ gas/config/tc-i386.c                   |   27 +++++++++++++++++++++++++++
+ gas/doc/c-i386.texi                    |   12 ++++++++++++
+ gas/testsuite/ChangeLog                |    7 +++++++
+ gas/testsuite/gas/i386/i386.exp        |    2 ++
+ gas/testsuite/gas/i386/omit-lock-no.d  |   12 ++++++++++++
+ gas/testsuite/gas/i386/omit-lock-yes.d |   12 ++++++++++++
+ gas/testsuite/gas/i386/omit-lock.s     |    6 ++++++
+ 8 files changed, 88 insertions(+)
+ create mode 100644 gas/testsuite/gas/i386/omit-lock-no.d
+ create mode 100644 gas/testsuite/gas/i386/omit-lock-yes.d
+ create mode 100644 gas/testsuite/gas/i386/omit-lock.s
+
+Index: binutils-2.24/gas/ChangeLog
+===================================================================
+--- binutils-2.24.orig/gas/ChangeLog
++++ binutils-2.24/gas/ChangeLog
+@@ -4,6 +4,17 @@
+        single-bit bitfields.
+        (build_modrm_byte): Don't compare single-bit bitfields to "1".
+ 
++2014-08-06  Ilya Tocar  <ilya.tocar@intel.com>
++
++       * config/tc-i386.c (omit_lock_prefix): New.
++       (output_insn): Omit lock prefix if omit_lock_prefix is true.
++       (OPTION_omit_lock_prefix): New.
++       (md_longopts): Add momit-lock-prefix.
++       (md_parse_option): Handle momit-lock-prefix.
++       (md_show_usage): Add momit-lock-prefix=[no|yes].
++       * doc/c-i386.texi (momit-lock-prefix): Document.
++
++
+ 2013-11-18  H.J. Lu  <hongjiu.lu@intel.com>
+ 
+        * config/tc-i386.c (lex_got): Add a dummy "int bnd_prefix"
+Index: binutils-2.24/gas/config/tc-i386.c
+===================================================================
+--- binutils-2.24.orig/gas/config/tc-i386.c
++++ binutils-2.24/gas/config/tc-i386.c
+@@ -541,6 +541,10 @@ static int add_bnd_prefix = 0;
+ /* 1 if pseudo index register, eiz/riz, is allowed .  */
+ static int allow_index_reg = 0;
+ 
++/* 1 if the assembler should ignore LOCK prefix, even if it was
++   specified explicitly.  */
++static int omit_lock_prefix = 0;
++
+ static enum check_kind
+   {
+     check_none = 0,
+@@ -6910,6 +6914,15 @@ output_insn (void)
+       unsigned int j;
+       unsigned int prefix;
+ 
++      /* Some processors fail on LOCK prefix. This options makes
++        assembler ignore LOCK prefix and serves as a workaround.  */
++      if (omit_lock_prefix)
++       {
++         if (i.tm.base_opcode == LOCK_PREFIX_OPCODE)
++           return;
++         i.prefix[LOCK_PREFIX] = 0;
++       }
++
+       /* Since the VEX/EVEX prefix contains the implicit prefix, we
+         don't need the explicit prefix.  */
+       if (!i.tm.opcode_modifier.vex && !i.tm.opcode_modifier.evex)
+@@ -9483,6 +9496,7 @@ const char *md_shortopts = "qn";
+ #define OPTION_MADD_BND_PREFIX (OPTION_MD_BASE + 15)
+ #define OPTION_MEVEXLIG (OPTION_MD_BASE + 16)
+ #define OPTION_MEVEXWIG (OPTION_MD_BASE + 17)
++#define OPTION_omit_lock_prefix (OPTION_MD_BASE + 18)
+ 
+ struct option md_longopts[] =
+ {
+@@ -9509,6 +9523,7 @@ struct option md_longopts[] =
+   {"madd-bnd-prefix", no_argument, NULL, OPTION_MADD_BND_PREFIX},
+   {"mevexlig", required_argument, NULL, OPTION_MEVEXLIG},
+   {"mevexwig", required_argument, NULL, OPTION_MEVEXWIG},
++  {"momit-lock-prefix", required_argument, NULL, OPTION_omit_lock_prefix},
+   {NULL, no_argument, NULL, 0}
+ };
+ size_t md_longopts_size = sizeof (md_longopts);
+@@ -9790,6 +9805,15 @@ md_parse_option (int c, char *arg)
+        as_fatal (_("invalid -mevexwig= option: `%s'"), arg);
+       break;
+ 
++    case OPTION_omit_lock_prefix:
++      if (strcasecmp (arg, "yes") == 0)
++        omit_lock_prefix = 1;
++      else if (strcasecmp (arg, "no") == 0)
++        omit_lock_prefix = 0;
++      else
++        as_fatal (_("invalid -momit-lock-prefix= option: `%s'"), arg);
++      break;
++
+     default:
+       return 0;
+     }
+@@ -9942,6 +9966,9 @@ md_show_usage (FILE *stream)
+   -mold-gcc               support old (<= 2.8.1) versions of gcc\n"));
+   fprintf (stream, _("\
+   -madd-bnd-prefix        add BND prefix for all valid branches\n"));
++  fprintf (stream, _("\
++  -momit-lock-prefix=[no|yes]\n\
++                          strip all lock prefixes\n"));
+ }
+ 
+ #if ((defined (OBJ_MAYBE_COFF) && defined (OBJ_MAYBE_AOUT)) \
+Index: binutils-2.24/gas/doc/c-i386.texi
+===================================================================
+--- binutils-2.24.orig/gas/doc/c-i386.texi
++++ binutils-2.24/gas/doc/c-i386.texi
+@@ -282,6 +282,18 @@ The @code{.att_syntax} and @code{.intel_
+ This option forces the assembler to add BND prefix to all branches, even
+ if such prefix was not explicitly specified in the source code.
+ 
++@cindex @samp{-momit-lock-prefix=} option, i386
++@cindex @samp{-momit-lock-prefix=} option, x86-64
++@item -momit-lock-prefix=@var{no}
++@itemx -momit-lock-prefix=@var{yes}
++These options control how the assembler should encode lock prefix.
++This option is intended as a workaround for processors, that fail on
++lock prefix. This option can only be safely used with single-core,
++single-thread computers
++@option{-momit-lock-prefix=@var{yes}} will omit all lock prefixes.
++@option{-momit-lock-prefix=@var{no}} will encode lock prefix as usual,
++which is the default.
++
+ @end table
+ @c man end
+ 
+Index: binutils-2.24/gas/testsuite/ChangeLog
+===================================================================
+--- binutils-2.24.orig/gas/testsuite/ChangeLog
++++ binutils-2.24/gas/testsuite/ChangeLog
+@@ -1,3 +1,10 @@
++2014-08-06  Ilya Tocar  <ilya.tocar@intel.com>
++
++       * gas/i386/i386.exp: Run new tests.
++       * gas/i386/omit-lock-no.d: New.
++       * gas/i386/omit-lock-yes.d: Ditto.
++       * gas/i386/omit-lock.s: Ditto.+
++
+ 2013-11-20  Yufeng Zhang  <yufeng.zhang@arm.com>
+ 
+        * gas/aarch64/msr.s: Add tests.
+Index: binutils-2.24/gas/testsuite/gas/i386/i386.exp
+===================================================================
+--- binutils-2.24.orig/gas/testsuite/gas/i386/i386.exp
++++ binutils-2.24/gas/testsuite/gas/i386/i386.exp
+@@ -267,6 +267,8 @@ if [expr ([istarget "i*86-*-*"] ||  [ist
+     run_list_test "mpx-inval-1" "-al"
+     run_dump_test "mpx-add-bnd-prefix"
+     run_dump_test "sha"
++    run_dump_test "omit-lock-yes"
++    run_dump_test "omit-lock-no"
+ 
+     # These tests require support for 8 and 16 bit relocs,
+     # so we only run them for ELF and COFF targets.
+Index: binutils-2.24/gas/testsuite/gas/i386/omit-lock-no.d
+===================================================================
+--- /dev/null
++++ binutils-2.24/gas/testsuite/gas/i386/omit-lock-no.d
+@@ -0,0 +1,12 @@
++#source: omit-lock.s
++#as: -momit-lock-prefix=yes  -momit-lock-prefix=no
++#objdump: -dw
++#name: i386  omit lock = no
++
++.*: +file format .*i386.*
++
++Disassembly of section .text:
++
++0+ <main>:
++   0:  f0 f0 83 00 01          lock lock addl \$0x1,\(%eax\)
++#pass
+Index: binutils-2.24/gas/testsuite/gas/i386/omit-lock-yes.d
+===================================================================
+--- /dev/null
++++ binutils-2.24/gas/testsuite/gas/i386/omit-lock-yes.d
+@@ -0,0 +1,12 @@
++#source: omit-lock.s
++#as: -momit-lock-prefix=yes
++#objdump: -dw
++#name: i386  omit lock = yes
++
++.*: +file format .*i386.*
++
++Disassembly of section .text:
++
++0+ <main>:
++   0:  83 00 01                addl   \$0x1,\(%eax\)
++#pass
+Index: binutils-2.24/gas/testsuite/gas/i386/omit-lock.s
+===================================================================
+--- /dev/null
++++ binutils-2.24/gas/testsuite/gas/i386/omit-lock.s
+@@ -0,0 +1,6 @@
++        .code32
++.globl main
++        .type   main, @function
++main:
++        lock
++        lock addl $0x1,(%eax)