+2020-04-26 Hongtao Liu <hongtao.liu@intel.com
+
+ * config/tc-i386.c (lfence_before_ret_shl): New member.
+ (load_insn_p): implict load for POP/POPA/POPF/XLATB, no load
+ for Anysize insns.
+ (insert_after_load): Issue warning for REP CMPS/SCAS.
+ (insert_before_before): Handle iret, Handle
+ -mlfence-before-ret=shl, Adjust operand size of or/not/shl to ret's,
+ (md_parse_option): Change -mlfence-before-ret=[none|not|or] to
+ -mlfence-before-ret=[none/not/or/shl/yes].
+ Enable -mlfence-before-ret=shl when
+ -mlfence-beofre-indirect-branch=all and no explict -mlfence-before-ret option.
+ (md_show_usage): Ditto.
+ * doc/c-i386.texi: Ditto.
+ * testsuite/gas/i386/i386.exp: Add new testcases.
+ * testsuite/gas/i386/lfence-load-b.d: New.
+ * testsuite/gas/i386/lfence-load-b.e: New.
+ * testsuite/gas/i386/lfence-load.d: Modified.
+ * testsuite/gas/i386/lfence-load.e: New.
+ * testsuite/gas/i386/lfence-load.s: Modified.
+ * testsuite/gas/i386/lfence-ret-a.d: Modified.
+ * testsuite/gas/i386/lfence-ret-b.d: Modified.
+ * testsuite/gas/i386/lfence-ret-c.d: New.
+ * testsuite/gas/i386/lfence-ret-d.d: New.
+ * testsuite/gas/i386/lfence-ret.s: Modified.
+ * testsuite/gas/i386/x86-64-lfence-load-b.d: New.
+ * testsuite/gas/i386/x86-64-lfence-load.d: Modified.
+ * testsuite/gas/i386/x86-64-lfence-load.s: Modified.
+ * testsuite/gas/i386/x86-64-lfence-ret-a.d: Modified.
+ * testsuite/gas/i386/x86-64-lfence-ret-b.d: Modified.
+ * testsuite/gas/i386/x86-64-lfence-ret-c.d: New.
+ * testsuite/gas/i386/x86-64-lfence-ret-d.d: New
+ * testsuite/gas/i386/x86-64-lfence-ret-e.d: New.
+ * testsuite/gas/i386/x86-64-lfence-ret.e: New.
+ * testsuite/gas/i386/x86-64-lfence-ret.s: New.
+
2020-04-22 Max Filippov <jcmvbkbc@gmail.com>
PR ld/25861
{
lfence_before_ret_none = 0,
lfence_before_ret_not,
- lfence_before_ret_or
+ lfence_before_ret_or,
+ lfence_before_ret_shl
}
lfence_before_ret;
if (!any_vex_p)
{
- /* lea */
- if (i.tm.base_opcode == 0x8d)
+ /* Anysize insns: lea, invlpg, clflush, prefetchnta, prefetcht0,
+ prefetcht1, prefetcht2, prefetchtw, bndmk, bndcl, bndcu, bndcn,
+ bndstx, bndldx, prefetchwt1, clflushopt, clwb, cldemote. */
+ if (i.tm.opcode_modifier.anysize)
return 0;
- /* pop */
- if ((i.tm.base_opcode & ~7) == 0x58
- || (i.tm.base_opcode == 0x8f && i.tm.extension_opcode == 0))
+ /* pop, popf, popa. */
+ if (strcmp (i.tm.name, "pop") == 0
+ || i.tm.base_opcode == 0x9d
+ || i.tm.base_opcode == 0x61)
return 1;
/* movs, cmps, lods, scas. */
if ((i.tm.base_opcode | 0xb) == 0xaf)
return 1;
- /* outs */
- if (base_opcode == 0x6f)
+ /* outs, xlatb. */
+ if (base_opcode == 0x6f
+ || i.tm.base_opcode == 0xd7)
return 1;
+ /* NB: For AMD-specific insns with implicit memory operands,
+ they're intentionally not covered. */
}
/* No memory operand. */
{
if (lfence_after_load && load_insn_p ())
{
+ /* There are also two REP string instructions that require
+ special treatment. Specifically, the compare string (CMPS)
+ and scan string (SCAS) instructions set EFLAGS in a manner
+ that depends on the data being compared/scanned. When used
+ with a REP prefix, the number of iterations may therefore
+ vary depending on this data. If the data is a program secret
+ chosen by the adversary using an LVI method,
+ then this data-dependent behavior may leak some aspect
+ of the secret. */
+ if (((i.tm.base_opcode | 0x1) == 0xa7
+ || (i.tm.base_opcode | 0x1) == 0xaf)
+ && i.prefix[REP_PREFIX])
+ {
+ as_warn (_("`%s` changes flags which would affect control flow behavior"),
+ i.tm.name);
+ }
char *p = frag_more (3);
*p++ = 0xf;
*p++ = 0xae;
return;
}
- /* Output or/not and lfence before ret. */
+ /* Output or/not/shl and lfence before ret/lret/iret. */
if (lfence_before_ret != lfence_before_ret_none
&& (i.tm.base_opcode == 0xc2
|| i.tm.base_opcode == 0xc3
|| i.tm.base_opcode == 0xca
- || i.tm.base_opcode == 0xcb))
+ || i.tm.base_opcode == 0xcb
+ || i.tm.base_opcode == 0xcf))
{
if (last_insn.kind != last_insn_other
&& last_insn.seg == now_seg)
last_insn.name, i.tm.name);
return;
}
- if (lfence_before_ret == lfence_before_ret_or)
- {
- /* orl: 0x830c2400. */
- p = frag_more ((flag_code == CODE_64BIT ? 1 : 0) + 4 + 3);
- if (flag_code == CODE_64BIT)
- *p++ = 0x48;
- *p++ = 0x83;
- *p++ = 0xc;
- *p++ = 0x24;
- *p++ = 0x0;
- }
- else
- {
- p = frag_more ((flag_code == CODE_64BIT ? 2 : 0) + 6 + 3);
- /* notl: 0xf71424. */
- if (flag_code == CODE_64BIT)
- *p++ = 0x48;
+
+ /* lret or iret. */
+ bfd_boolean lret = (i.tm.base_opcode | 0x5) == 0xcf;
+ bfd_boolean has_rexw = i.prefix[REX_PREFIX] & REX_W;
+ char prefix = 0x0;
+ /* Default operand size for far return is 32 bits,
+ 64 bits for near return. */
+ /* Near ret ingore operand size override under CPU64. */
+ if ((!lret && flag_code == CODE_64BIT) || has_rexw)
+ prefix = 0x48;
+ else if (i.prefix[DATA_PREFIX])
+ prefix = 0x66;
+
+ if (lfence_before_ret == lfence_before_ret_not)
+ {
+ /* not: 0xf71424, may add prefix
+ for operand size override or 64-bit code. */
+ p = frag_more ((prefix ? 2 : 0) + 6 + 3);
+ if (prefix)
+ *p++ = prefix;
*p++ = 0xf7;
*p++ = 0x14;
*p++ = 0x24;
- /* notl: 0xf71424. */
- if (flag_code == CODE_64BIT)
- *p++ = 0x48;
+ if (prefix)
+ *p++ = prefix;
*p++ = 0xf7;
*p++ = 0x14;
*p++ = 0x24;
}
+ else
+ {
+ p = frag_more ((prefix ? 1 : 0) + 4 + 3);
+ if (prefix)
+ *p++ = prefix;
+ if (lfence_before_ret == lfence_before_ret_or)
+ {
+ /* or: 0x830c2400, may add prefix
+ for operand size override or 64-bit code. */
+ *p++ = 0x83;
+ *p++ = 0x0c;
+ }
+ else
+ {
+ /* shl: 0xc1242400, may add prefix
+ for operand size override or 64-bit code. */
+ *p++ = 0xc1;
+ *p++ = 0x24;
+ }
+
+ *p++ = 0x24;
+ *p++ = 0x0;
+ }
+
*p++ = 0xf;
*p++ = 0xae;
*p = 0xe8;
case OPTION_MLFENCE_BEFORE_INDIRECT_BRANCH:
if (strcasecmp (arg, "all") == 0)
- lfence_before_indirect_branch = lfence_branch_all;
+ {
+ lfence_before_indirect_branch = lfence_branch_all;
+ if (lfence_before_ret == lfence_before_ret_none)
+ lfence_before_ret = lfence_before_ret_shl;
+ }
else if (strcasecmp (arg, "memory") == 0)
lfence_before_indirect_branch = lfence_branch_memory;
else if (strcasecmp (arg, "register") == 0)
lfence_before_ret = lfence_before_ret_or;
else if (strcasecmp (arg, "not") == 0)
lfence_before_ret = lfence_before_ret_not;
+ else if (strcasecmp (arg, "shl") == 0 || strcasecmp (arg, "yes") == 0)
+ lfence_before_ret = lfence_before_ret_shl;
else if (strcasecmp (arg, "none") == 0)
lfence_before_ret = lfence_before_ret_none;
else
-mlfence-before-indirect-branch=[none|all|register|memory] (default: none)\n\
generate lfence before indirect near branch\n"));
fprintf (stream, _("\
- -mlfence-before-ret=[none|or|not] (default: none)\n\
+ -mlfence-before-ret=[none|or|not|shl|yes] (default: none)\n\
generate lfence before ret\n"));
fprintf (stream, _("\
-mamd64 accept only AMD64 ISA [default]\n"));
@option{-mlfence-before-indirect-branch=@var{all}} will generate lfence
before indirect near branch via register and issue a warning before
indirect near branch via memory.
+It also implicitly sets @option{-mlfence-before-ret=@var{shl}} when
+there's no explict @option{-mlfence-before-ret=}.
@option{-mlfence-before-indirect-branch=@var{register}} will generate
lfence before indirect near branch via register.
@option{-mlfence-before-indirect-branch=@var{memory}} will issue a
@cindex @samp{-mlfence-before-ret=} option, i386
@cindex @samp{-mlfence-before-ret=} option, x86-64
@item -mlfence-before-ret=@var{none}
+@item -mlfence-before-ret=@var{shl}
@item -mlfence-before-ret=@var{or}
+@item -mlfence-before-ret=@var{yes}
@itemx -mlfence-before-ret=@var{not}
These options control whether the assembler should generate lfence
before ret. @option{-mlfence-before-ret=@var{or}} will generate
generate or instruction with lfence.
-@option{-mlfence-before-ret=@var{not}} will generate not instruction
-with lfence.
-@option{-mlfence-before-ret=@var{none}} will not generate lfence,
-which is the default.
+@option{-mlfence-before-ret=@var{shl/yes}} will generate shl instruction
+with lfence. @option{-mlfence-before-ret=@var{not}} will generate not
+instruction with lfence. @option{-mlfence-before-ret=@var{none}} will not
+generate lfence, which is the default.
@cindex @samp{-mx86-used-note=} option, i386
@cindex @samp{-mx86-used-note=} option, x86-64
run_dump_test "lfence-indbr-c"
run_dump_test "lfence-ret-a"
run_dump_test "lfence-ret-b"
+ run_dump_test "lfence-ret-c"
+ run_dump_test "lfence-ret-d"
run_dump_test "lfence-byte"
# These tests require support for 8 and 16 bit relocs,
run_dump_test "x86-64-lfence-indbr-c"
run_dump_test "x86-64-lfence-ret-a"
run_dump_test "x86-64-lfence-ret-b"
+ run_dump_test "x86-64-lfence-ret-c"
+ run_dump_test "x86-64-lfence-ret-d"
+ run_dump_test "x86-64-lfence-ret-e"
run_dump_test "x86-64-lfence-byte"
if { ![istarget "*-*-aix*"]
#as: -mlfence-after-load=yes
#objdump: -dw
+#warning_output: lfence-load.e
#name: -mlfence-after-load=yes
.*: +file format .*
+[a-f0-9]+: 0f c7 75 00 vmptrld 0x0\(%ebp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: 66 0f c7 75 00 vmclear 0x0\(%ebp\)
+ +[a-f0-9]+: 66 0f 38 82 55 00 invpcid 0x0\(%ebp\),%edx
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 0f 01 7d 00 invlpg 0x0\(%ebp\)
+ +[a-f0-9]+: 0f ae 7d 00 clflush 0x0\(%ebp\)
+ +[a-f0-9]+: 66 0f ae 7d 00 clflushopt 0x0\(%ebp\)
+ +[a-f0-9]+: 66 0f ae 75 00 clwb 0x0\(%ebp\)
+ +[a-f0-9]+: 0f 1c 45 00 cldemote 0x0\(%ebp\)
+ +[a-f0-9]+: f3 0f 1b 4d 00 bndmk 0x0\(%ebp\),%bnd1
+ +[a-f0-9]+: f3 0f 1a 4d 00 bndcl 0x0\(%ebp\),%bnd1
+ +[a-f0-9]+: f2 0f 1a 4d 00 bndcu 0x0\(%ebp\),%bnd1
+ +[a-f0-9]+: f2 0f 1b 4d 00 bndcn 0x0\(%ebp\),%bnd1
+ +[a-f0-9]+: 0f 1b 4d 00 bndstx %bnd1,0x0\(%ebp\)
+ +[a-f0-9]+: 0f 1a 4d 00 bndldx 0x0\(%ebp\),%bnd1
+ +[a-f0-9]+: 0f 18 4d 00 prefetcht0 0x0\(%ebp\)
+ +[a-f0-9]+: 0f 18 55 00 prefetcht1 0x0\(%ebp\)
+ +[a-f0-9]+: 0f 18 5d 00 prefetcht2 0x0\(%ebp\)
+ +[a-f0-9]+: 0f 0d 4d 00 prefetchw 0x0\(%ebp\)
+ +[a-f0-9]+: 1f pop %ds
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 9d popf
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 61 popa
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: d7 xlat %ds:\(%ebx\)
+ +[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: d9 55 00 fsts 0x0\(%ebp\)
+[a-f0-9]+: d9 45 00 flds 0x0\(%ebp\)
+[a-f0-9]+: 0f ae e8 lfence
--- /dev/null
+.*: Assembler messages:
+.*:??: Warning: `scas` changes flags which would affect control flow behavior
+.*:??: Warning: `cmps` changes flags which would affect control flow behavior
lgdt (%ebp)
vmptrld (%ebp)
vmclear (%ebp)
+ invpcid (%ebp), %edx
+ invlpg (%ebp)
+ clflush (%ebp)
+ clflushopt (%ebp)
+ clwb (%ebp)
+ cldemote (%ebp)
+ bndmk (%ebp), %bnd1
+ bndcl (%ebp), %bnd1
+ bndcu (%ebp), %bnd1
+ bndcn (%ebp), %bnd1
+ bndstx %bnd1, (%ebp)
+ bndldx (%ebp), %bnd1
+ prefetcht0 (%ebp)
+ prefetcht1 (%ebp)
+ prefetcht2 (%ebp)
+ prefetchw (%ebp)
+ pop %ds
+ popf
+ popa
+ xlatb (%ebx)
fsts (%ebp)
flds (%ebp)
fistl (%ebp)
Disassembly of section .text:
0+ <_start>:
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 retw
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 retw \$0x14
+[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: c3 ret
+[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: c2 1e 00 ret \$0x1e
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
#pass
Disassembly of section .text:
0+ <_start>:
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 retw
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 retw \$0x14
+[a-f0-9]+: f7 14 24 notl \(%esp\)
+[a-f0-9]+: f7 14 24 notl \(%esp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: f7 14 24 notl \(%esp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: c2 1e 00 ret \$0x1e
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 66 f7 14 24 notw \(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: f7 14 24 notl \(%esp\)
+ +[a-f0-9]+: f7 14 24 notl \(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: f7 14 24 notl \(%esp\)
+ +[a-f0-9]+: f7 14 24 notl \(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
#pass
--- /dev/null
+#source: lfence-ret.s
+#as: -mlfence-before-ret=or -mlfence-before-indirect-branch=all
+#objdump: -dw
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+ <_start>:
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 retw
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 retw \$0x14
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c3 ret
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c2 1e 00 ret \$0x1e
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+#pass
--- /dev/null
+#source: lfence-ret.s
+#as: -mlfence-before-ret=shl
+#objdump: -dw
+#name: -mlfence-before-ret=shl
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+ <_start>:
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 retw
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 retw \$0x14
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c3 ret
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c2 1e 00 ret \$0x1e
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%esp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+#pass
.text
_start:
+ retw
+ retw $20
ret
ret $30
+ lretw
+ lretw $40
+ lret
+ lret $40
#as: -mlfence-after-load=yes
#objdump: -dw
+#warning_output: lfence-load.e
#name: x86-64 -mlfence-after-load=yes
.*: +file format .*
+[a-f0-9]+: 0f c7 75 00 vmptrld 0x0\(%rbp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: 66 0f c7 75 00 vmclear 0x0\(%rbp\)
+ +[a-f0-9]+: 66 0f 38 82 55 00 invpcid 0x0\(%rbp\),%rdx
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 67 0f 01 38 invlpg \(%eax\)
+ +[a-f0-9]+: 0f ae 7d 00 clflush 0x0\(%rbp\)
+ +[a-f0-9]+: 66 0f ae 7d 00 clflushopt 0x0\(%rbp\)
+ +[a-f0-9]+: 66 0f ae 75 00 clwb 0x0\(%rbp\)
+ +[a-f0-9]+: 0f 1c 45 00 cldemote 0x0\(%rbp\)
+ +[a-f0-9]+: f3 0f 1b 4d 00 bndmk 0x0\(%rbp\),%bnd1
+ +[a-f0-9]+: f3 0f 1a 4d 00 bndcl 0x0\(%rbp\),%bnd1
+ +[a-f0-9]+: f2 0f 1a 4d 00 bndcu 0x0\(%rbp\),%bnd1
+ +[a-f0-9]+: f2 0f 1b 4d 00 bndcn 0x0\(%rbp\),%bnd1
+ +[a-f0-9]+: 0f 1b 4d 00 bndstx %bnd1,0x0\(%rbp\)
+ +[a-f0-9]+: 0f 1a 4d 00 bndldx 0x0\(%rbp\),%bnd1
+ +[a-f0-9]+: 0f 18 4d 00 prefetcht0 0x0\(%rbp\)
+ +[a-f0-9]+: 0f 18 55 00 prefetcht1 0x0\(%rbp\)
+ +[a-f0-9]+: 0f 18 5d 00 prefetcht2 0x0\(%rbp\)
+ +[a-f0-9]+: 0f 0d 4d 00 prefetchw 0x0\(%rbp\)
+ +[a-f0-9]+: 0f a1 popq %fs
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 9d popfq
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: d7 xlat %ds:\(%rbx\)
+ +[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: d9 55 00 fsts 0x0\(%rbp\)
+[a-f0-9]+: d9 45 00 flds 0x0\(%rbp\)
+[a-f0-9]+: 0f ae e8 lfence
lgdt (%rbp)
vmptrld (%rbp)
vmclear (%rbp)
+ invpcid (%rbp), %rdx
+ invlpg (%eax)
+ clflush (%rbp)
+ clflushopt (%rbp)
+ clwb (%rbp)
+ cldemote (%rbp)
+ bndmk (%rbp), %bnd1
+ bndcl (%rbp), %bnd1
+ bndcu (%rbp), %bnd1
+ bndcn (%rbp), %bnd1
+ bndstx %bnd1, (%rbp)
+ bndldx (%rbp), %bnd1
+ prefetcht0 (%rbp)
+ prefetcht1 (%rbp)
+ prefetcht2 (%rbp)
+ prefetchw (%rbp)
+ pop %fs
+ popf
+ xlatb (%rbx)
fsts (%rbp)
flds (%rbp)
fistl (%rbp)
-#source: lfence-ret.s
+#source: x86-64-lfence-ret.s
#as: -mlfence-before-ret=or
-#objdump: -dw
+#warning_output: x86-64-lfence-ret.e
+#objdump: -dw -Mintel64
#name: x86-64 -mlfence-before-ret=or
.*: +file format .*
Disassembly of section .text:
0+ <_start>:
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 data16 retq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 data16 retq \$0x14
+[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: c3 retq
+[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: c2 1e 00 retq \$0x1e
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c3 data16 rex.W retq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 cb lretq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 ca 28 00 lretq \$0x28
#pass
-#source: lfence-ret.s
+#source: x86-64-lfence-ret.s
#as: -mlfence-before-ret=not
-#objdump: -dw
+#warning_output: x86-64-lfence-ret.e
+#objdump: -dw -Mintel64
#name: x86-64 -mlfence-before-ret=not
.*: +file format .*
Disassembly of section .text:
0+ <_start>:
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 data16 retq
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 data16 retq \$0x14
+[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+[a-f0-9]+: 0f ae e8 lfence
+[a-f0-9]+: c2 1e 00 retq \$0x1e
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c3 data16 rex.W retq
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28
+ +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\)
+ +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\)
+ +[a-f0-9]+: 66 f7 14 24 notw \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: f7 14 24 notl \(%rsp\)
+ +[a-f0-9]+: f7 14 24 notl \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: f7 14 24 notl \(%rsp\)
+ +[a-f0-9]+: f7 14 24 notl \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 cb lretq
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 48 f7 14 24 notq \(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 ca 28 00 lretq \$0x28
#pass
--- /dev/null
+#source: x86-64-lfence-ret.s
+#as: -mlfence-before-ret=or -mlfence-before-indirect-branch=all
+#warning_output: x86-64-lfence-ret.e
+#objdump: -dw -Mintel64
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+ <_start>:
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 data16 retq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 data16 retq \$0x14
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c3 retq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c2 1e 00 retq \$0x1e
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c3 data16 rex.W retq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 83 0c 24 00 orw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: 83 0c 24 00 orl \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 cb lretq
+ +[a-f0-9]+: 48 83 0c 24 00 orq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 ca 28 00 lretq \$0x28
+#pass
--- /dev/null
+#source: x86-64-lfence-ret.s
+#as: -mlfence-before-ret=shl
+#warning_output: x86-64-lfence-ret.e
+#objdump: -dw -Mintel64
+#name: x86-64 -mlfence-before-ret=shl
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+ <_start>:
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 data16 retq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 data16 retq \$0x14
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c3 retq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c2 1e 00 retq \$0x1e
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c3 data16 rex.W retq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 cb lretq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 ca 28 00 lretq \$0x28
+#pass
--- /dev/null
+#source: x86-64-lfence-ret.s
+#as: -mlfence-before-ret=shl
+#warning_output: x86-64-lfence-ret.e
+#objdump: -dw -Mintel64
+#name: x86-64 -mlfence-before-ret=yes
+
+.*: +file format .*
+
+
+Disassembly of section .text:
+
+0+ <_start>:
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c3 data16 retq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 c2 14 00 data16 retq \$0x14
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c3 retq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: c2 1e 00 retq \$0x1e
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c3 data16 rex.W retq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 48 c2 28 00 data16 rex.W retq \$0x28
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 cb lretw
+ +[a-f0-9]+: 66 c1 24 24 00 shlw \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 66 ca 28 00 lretw \$0x28
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: cb lret
+ +[a-f0-9]+: c1 24 24 00 shll \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: ca 28 00 lret \$0x28
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 cb lretq
+ +[a-f0-9]+: 48 c1 24 24 00 shlq \$0x0,\(%rsp\)
+ +[a-f0-9]+: 0f ae e8 lfence
+ +[a-f0-9]+: 48 ca 28 00 lretq \$0x28
+#pass
--- /dev/null
+.*: Assembler messages:
+.*:??: Warning: no instruction mnemonic suffix given and no register operands; using default for `lret'
+.*:??: Warning: no instruction mnemonic suffix given and no register operands; using default for `lret'
--- /dev/null
+ .text
+_start:
+ retw
+ retw $20
+ ret
+ ret $30
+ data16 rex.w ret
+ data16 rex.w ret $40
+ lretw
+ lretw $40
+ lret
+ lret $40
+ lretq
+ lretq $40
projects / binutils-gdb.git / commitdiff