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x86: fix "REP RET" with -madd-bnd-prefix

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Just like any other branches, RET should gain a BND prefix also when
already prefixed in source by REP.
This commit is contained in:
Jan Beulich
2018-07-11 10:23:48 +02:00
committed by Jan Beulich
parent c7df3df443
commit 76d3a78a49
8 changed files with 45 additions and 8 deletions
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13
gas/ChangeLog
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@ -1,3 +1,16 @@
2018-07-11 Jan Beulich <jbeulich@suse.com>
* config/tc-i386.c (md_assemble): Also replace an already
present REP prefix.
* testsuite/gas/i386/mpx-add-bnd-prefix.s,
testsuite/gas/i386/x86-64-mpx-add-bnd-prefix.s: Test RET with
all REP flavors.
* testsuite/gas/i386/mpx-add-bnd-prefix.d,
testsuite/gas/i386/x86-64-mpx-add-bnd-prefix.d: Adjust
expectations.
* testsuite/gas/i386/mpx-add-bnd-prefix.e,
testsuite/gas/i386/x86-64-mpx-add-bnd-prefix.e: New.
2018-07-09 Jeff Law <law@redhat.com> 2018-07-09 Jeff Law <law@redhat.com>
* testsuite/nds32/ji-jr.d: Fix name tag. * testsuite/nds32/ji-jr.d: Fix name tag.

12
gas/config/tc-i386.c
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@ -4112,10 +4112,16 @@ md_assemble (char *line)
} }
/* Insert BND prefix. */ /* Insert BND prefix. */
if (add_bnd_prefix if (add_bnd_prefix && i.tm.opcode_modifier.bndprefixok)
&& i.tm.opcode_modifier.bndprefixok {
&& !i.prefix[BND_PREFIX]) if (!i.prefix[BND_PREFIX])
add_prefix (BND_PREFIX_OPCODE); add_prefix (BND_PREFIX_OPCODE);
else if (i.prefix[BND_PREFIX] != BND_PREFIX_OPCODE)
{
as_warn (_("replacing `rep'/`repe' prefix by `bnd'"));
i.prefix[BND_PREFIX] = BND_PREFIX_OPCODE;
}
}
/* Check string instruction segment overrides. */ /* Check string instruction segment overrides. */
if (i.tm.opcode_modifier.isstring && i.mem_operands != 0) if (i.tm.opcode_modifier.isstring && i.mem_operands != 0)

7
gas/testsuite/gas/i386/mpx-add-bnd-prefix.d
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@ -1,4 +1,5 @@
#as: -madd-bnd-prefix #as: -madd-bnd-prefix
#stderr: mpx-add-bnd-prefix.e
#objdump: -drw #objdump: -drw
#name: Check -madd-bnd-prefix #name: Check -madd-bnd-prefix
@ -18,7 +19,9 @@ Disassembly of section .text:
0+14 <foo>: 0+14 <foo>:
[ ]*[a-f0-9]+: f2 c3 bnd ret [ ]*[a-f0-9]+: f2 c3 bnd ret
[ ]*[a-f0-9]+: f2 c3 bnd ret [ ]*[a-f0-9]+: f2 c3 bnd ret
[ ]*[a-f0-9]+: f2 e8 f6 ff ff ff bnd call 14 <foo> [ ]*[a-f0-9]+: f2 c3 bnd ret
[ ]*[a-f0-9]+: f2 c3 bnd ret
[ ]*[a-f0-9]+: f2 e8 f2 ff ff ff bnd call 14 <foo>
[ ]*[a-f0-9]+: 01 c3 add %eax,%ebx [ ]*[a-f0-9]+: 01 c3 add %eax,%ebx
[ ]*[a-f0-9]+: e2 f2 loop 14 <foo> [ ]*[a-f0-9]+: e2 ee loop 14 <foo>
#pass #pass

3
gas/testsuite/gas/i386/mpx-add-bnd-prefix.e Normal file
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@ -0,0 +1,3 @@
.*: Assembler messages:
.*:12: Warning: .*rep.*bnd.*
.*:13: Warning: .*rep.*bnd.*

3
gas/testsuite/gas/i386/mpx-add-bnd-prefix.s
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@ -8,6 +8,9 @@
jmp *(%ebx) jmp *(%ebx)
ret ret
foo: foo:
# Use of REP/REPE prefix - converted to BND with warning
rep ret
repe ret
# Use of REPNE prefix - we shouldn't get any error # Use of REPNE prefix - we shouldn't get any error
repne ret repne ret
# BND prefix already exists - we shouldn't get any error here # BND prefix already exists - we shouldn't get any error here

7
gas/testsuite/gas/i386/x86-64-mpx-add-bnd-prefix.d
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@ -1,4 +1,5 @@
#as: -madd-bnd-prefix #as: -madd-bnd-prefix
#stderr: x86-64-mpx-add-bnd-prefix.e
#objdump: -drw #objdump: -drw
#name: Check -madd-bnd-prefix (x86-64) #name: Check -madd-bnd-prefix (x86-64)
@ -18,7 +19,9 @@ Disassembly of section .text:
0+14 <foo>: 0+14 <foo>:
[ ]*[a-f0-9]+: f2 c3 bnd retq [ ]*[a-f0-9]+: f2 c3 bnd retq
[ ]*[a-f0-9]+: f2 c3 bnd retq [ ]*[a-f0-9]+: f2 c3 bnd retq
[ ]*[a-f0-9]+: f2 e8 f6 ff ff ff bnd callq 14 <foo> [ ]*[a-f0-9]+: f2 c3 bnd retq
[ ]*[a-f0-9]+: f2 c3 bnd retq
[ ]*[a-f0-9]+: f2 e8 f2 ff ff ff bnd callq 14 <foo>
[ ]*[a-f0-9]+: 48 01 c3 add %rax,%rbx [ ]*[a-f0-9]+: 48 01 c3 add %rax,%rbx
[ ]*[a-f0-9]+: e2 f1 loop 14 <foo> [ ]*[a-f0-9]+: e2 ed loop 14 <foo>
#pass #pass

3
gas/testsuite/gas/i386/x86-64-mpx-add-bnd-prefix.e Normal file
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@ -0,0 +1,3 @@
.*: Assembler messages:
.*:12: Warning: .*rep.*bnd.*
.*:13: Warning: .*rep.*bnd.*

3
gas/testsuite/gas/i386/x86-64-mpx-add-bnd-prefix.s
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@ -8,6 +8,9 @@
jmp *(%rbx) jmp *(%rbx)
ret ret
foo: foo:
# Use of REP/REPE prefix - converted to BND with warning
rep ret
repe ret
# Use of REPNE prefix - we shouldn't get any error # Use of REPNE prefix - we shouldn't get any error
repne ret repne ret
# BND prefix already exists - we shouldn't get any error here # BND prefix already exists - we shouldn't get any error here