AMD and Intel differ in their handling of far indirect branches as well
as LFS/LGS/LSS: AMD CPUs ignore REX.W while Intel ones honors it. (Note
how the latter three were hybrids so far, while far branches were fully
AMD-like.)
While vendors agree about default operand size (64 bits) and hence
unavilability of a 32-bit form, AMD honors a 16-bit operand size
override (0x66) while Intel doesn't.
movsxd is a 64-bit only instruction. It supports both 16-bit and 32-bit
destination registers. Its AT&T mnemonic is movslq which only supports
64-bit destination register. There is also a discrepancy between AMD64
and Intel64 on movsxd with 16-bit destination register. AMD64 supports
32-bit source operand and Intel64 supports 16-bit source operand.
This patch updates movsxd encoding and decoding to alow 16-bit and 32-bit
destination registers. It also handles movsxd with 16-bit destination
register for AMD64 and Intel 64.
gas/
PR binutils/25445
* config/tc-i386.c (check_long_reg): Also convert to QWORD for
movsxd.
* doc/c-i386.texi: Add a node for AMD64 vs. Intel64 ISA
differences. Document movslq and movsxd.
* testsuite/gas/i386/i386.exp: Run PR binutils/25445 tests.
* testsuite/gas/i386/x86-64-movsxd-intel.d: New file.
* testsuite/gas/i386/x86-64-movsxd-intel64-intel.d: Likewise.
* testsuite/gas/i386/x86-64-movsxd-intel64-inval.l: Likewise.
* testsuite/gas/i386/x86-64-movsxd-intel64-inval.s: Likewise.
* testsuite/gas/i386/x86-64-movsxd-intel64.d: Likewise.
* testsuite/gas/i386/x86-64-movsxd-intel64.s: Likewise.
* testsuite/gas/i386/x86-64-movsxd-inval.l: Likewise.
* testsuite/gas/i386/x86-64-movsxd-inval.s: Likewise.
* testsuite/gas/i386/x86-64-movsxd.d: Likewise.
* testsuite/gas/i386/x86-64-movsxd.s: Likewise.
opcodes/
PR binutils/25445
* i386-dis.c (MOVSXD_Fixup): New function.
(movsxd_mode): New enum.
(x86_64_table): Use MOVSXD_Fixup and movsxd_mode on movsxd.
(intel_operand_size): Handle movsxd_mode.
(OP_E_register): Likewise.
(OP_G): Likewise.
* i386-opc.tbl: Remove Rex64 and allow 32-bit destination
register on movsxd. Add movsxd with 16-bit destination register
for AMD64 and Intel64 ISAs.
* i386-tbl.h: Regenerated.
binutils* objdump.c (visualize_jumps, color_output, extended_color_output)
(detected_jumps): New variables.
(usage): Add the new jump visualization options.
(option_values): Add new option value.
(long_options): Add the new option.
(jump_info_new, jump_info_free): New functions.
(jump_info_min_address, jump_info_max_address): Likewise.
(jump_info_end_address, jump_info_is_start_address): Likewise.
(jump_info_is_end_address, jump_info_size): Likewise.
(jump_info_unlink, jump_info_insert): Likewise.
(jump_info_add_front, jump_info_move_linked): Likewise.
(jump_info_intersect, jump_info_merge): Likewise.
(jump_info_sort, jump_info_visualize_address): Likewise.
(disassemble_jumps): New function - used to locate jumps.
(disassemble_bytes): Add ascii art generation.
(disassemble_section): Add scan to locate jumps.
(main): Parse the new visualization option.
* doc/binutils.texi: Document the new feature.
* NEWS: Mention the new feature.
opcodes * arm-dis.c (print_insn_arm): Fill in insn info fields for control
flow instructions.
(print_insn_thumb16, print_insn_thumb32): Likewise.
(print_insn): Initialize the insn info.
* i386-dis.c (print_insn): Initialize the insn info fields, and
detect jumps.
The disassembler change is such that in default mode we'd disassemble
the insns (for there not ebing any conflicts), but when AMD64 mode was
explicitly requested, we'd show them as "(bad)".
The expectation of x86-64-branch-3 for "call" / "jmp" with an obvious
direct destination to translate to an indirect _far_ branch is plain
wrong. The operand size prefix should have no effect at all on the
interpretation of the operand. The main underlying issue here is that
the Intel64 templates of the direct branches don't include Disp16, yet
various assumptions exist that it would always be there when there's
also Disp32/Disp32S, toggled by the operand size prefix (which is
being ignored by direct branches in Intel64 mode).
Along these lines it was also wrong to base the displacement width
decision solely on the operand size prefix: REX.W cancels this effect
and hence needs taking into consideration, too.
A disassembler change is needed here as well: XBEGIN was wrongly treated
the same as direct CALL/JMP, which isn't the case - the operand size
prefix does affect displacement size there, it's merely ignored when it
comes to updating [ER]IP.
Test also memory operands with operand size specifier, which was broken
prior to dc2be329b9 ("i386: Only check suffix in instruction
mnemonic"), due to the template not permitting any suffixes. Note that
this uncovered a disassembler issue, which is being fixed here as well.
As the comments (here: almost, in the opcode table: fully) correctly
state - all register operands except MONITOR's address one are fixed
at 32 bit size. Don't print 64-bit registers there.
Also adjust x86-64-suffix.d's name such that it wouldn't be identical to
x86-64-rep-suffix.d's, but instead resemble that of its sibling
x86-64-suffix-intel.d.
The original idea looks to have been for names to be composed in the
order that decoding gets done, which helps both reading and modifying
the code. Switch (back) to this model for some of the affected non-
vector insn enumerators.
Just like their AVX counterparts they can utilize XMVexScalar /
EXdVexScalarS / EXqVexScalarS taking care of dropping the middle operand
for their memory forms.
These encodings aren't valid in real and VM86 modes, but they are very
well usable in 16-bit protected mode.
A few adjustments in the disassembler tables are needed where Ev or Gv
were wrongly used. Additionally an adjustment is needed to avoid
printing "addr32" when that's already recognizable by the use of %eiz.
Furthermore the Iq operand template was wrong for XOP:0Ah encoding
insns: They're having a uniform 32-bit immediate. Drop Iq and introduce
Id instead.
Clone a few existing test cases to exercise assembler and disassembler.
I assume this mode was needed when EVEX.W handling wasn't really correct
yet for other than 64-bit mode. It's clearly not needed anymore. Its
elimination also allows dropping the EVEX.W split of VCVT{,U}SI2SS. (For
the record, the dropped mode would have been wrong if used in any table
entry not already guaranteeing EVEX.W=1.)
The only meaningful difference from OP_I() is the handling of the
VEX.W=1 case in 64-bit mode for bytemode being v_mode. Funnel
everything else into OP_I(), and drop no longer needed local
variables.
MOVNTI was wrongly assembled with a 66h prefix. Add IgnoreSize to
address this. It and the scalar to/from integer conversion insns also
were also wrongly using Ev / Gv, leading to 16-bit register names being
printed when 32-bit ones were meant.
Clone the 32-bit SSE2 test to cover both assembler and disassembler.
Break i386-dis-evex.h into small files such that each file is included
just once.
* i386-dis-evex.h: Break into ...
* i386-dis-evex-len.h: New file.
* i386-dis-evex-mod.h: Likewise.
* i386-dis-evex-prefix.h: Likewise.
* i386-dis-evex-reg.h: Likewise.
* i386-dis-evex-w.h: Likewise.
* i386-dis.c: Include i386-dis-evex-reg.h, i386-dis-evex-prefix.h,
i386-dis-evex.h, i386-dis-evex-len.h, i386-dis-evex-w.h and
i386-dis-evex-mod.h.
If VEX.vvvv and EVEX.vvvv are reserved, they must be all 1s, which are
all 0s in inverted form. Add check for unused VEX.vvvv and EVEX.vvvv
when disassembling VEX and EVEX instructions.
gas/
PR binutils/24626
* testsuite/gas/i386/disassem.s: Add tests for reserved VEX.vvvv
and EVEX.vvvv.
* testsuite/gas/i386/x86-64-disassem.s: Likewise.
* testsuite/gas/i386/disassem.d: Updated.
* testsuite/gas/i386/x86-64-disassem.d: Likewise.
opcodes/
PR binutils/24626
* i386-dis.c (print_insn): Check for unused VEX.vvvv and
EVEX.vvvv when disassembling VEX and EVEX instructions.
(OP_VEX): Set vex.register_specifier to 0 after readding
vex.register_specifier.
(OP_Vex_2src_1): Likewise.
(OP_Vex_2src_2): Likewise.
(OP_LWP_E): Likewise.
(OP_EX_Vex): Don't check vex.register_specifier.
(OP_XMM_Vex): Likewise.
For the flavors having a GPR operand EVEX.W is ignored outside of 64-bit
mode. The mnemonic should therefore not be KMOVQ, the GPR operand should
not name a non-existing 64-bit register, just like is already the case
for the AVX counterparts, and the Disp8 scaling factor should be 4
rather than 8.
PEXTR{B,W} and PINSR{B,W}, just like for AVX512BW, are WIG, no matter
that the SDM uses a nonstandard description of that fact.
PEXTRD, even with EVEX.W set, ignores that bit outside of 64-bit mode,
just like its AVX counterpart.
AVX "VMOVQ xmm1, xmm2/m64" and "VMOVQ xmm1/m64, xmm2" can only be
encoded with VEX.128. Set Vex=1 on VEX.128 only vmovq and update
assembler tests.
gas/
PR gas/23665
* testsuite/gas/i386/avx-scalar-intel.d: Updated.
* testsuite/gas/i386/avx-scalar.d: Likewise.
* testsuite/gas/i386/x86-64-avx-scalar-intel.d: Likewise.
* testsuite/gas/i386/x86-64-avx-scalar.d: Likewise.
opcodes/
PR gas/23665
* i386-dis.c (vex_len_table): Update VEX_LEN_0F7E_P_1 and
VEX_LEN_0FD6_P_2 entries.
* i386-opc.tbl: Set Vex=1 on VEX.128 only vmovq.
* i386-tbl.h: Regenerated.
Update x86 disassembler to ignore the EVEX.W bit in EVEX vcvt[u]si2s[sd]
instructions in 32-bit mode.
gas/
PR binutils/23655
* testsuite/gas/i386/evex.d: New file.
* testsuite/gas/i386/evex.s: Likewise.
* testsuite/gas/i386/i386.exp: Run evex.
opcodes/
PR binutils/23655
* i386-dis-evex.h (evex_table): Replace Eq with Edqa for
vcvtsi2ss%LQ, vcvtsi2sd%LQ, vcvtusi2ss%LQ and vcvtusi2sd%LQ.
* i386-dis.c (Edqa): New.
(dqa_mode): Likewise.
(intel_operand_size): Handle dqa_mode as m_mode.
(OP_E_register): Handle dqa_mode as dq_mode.
(OP_E_memory): Set shift for dqa_mode based on address_mode.
In 64-bit mode, display eiz for address with the addr32 prefix and without
base nor index registers. For
mov -0xccddef(,%eiz,), %rax
disassembler now displays:
67 48 8b 04 25 11 22 33 ff mov -0xccddef(,%eiz,1),%rax
instead of
67 48 8b 04 25 11 22 33 ff addr32 mov 0xffffffffff332211,%rax
gas/
* testsuite/gas/i386/evex-no-scale-64.d: Updated.
* testsuite/gas/i386/x86-64-addr32-intel.d: Likewise.
* testsuite/gas/i386/x86-64-addr32.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-addr32-intel.d: Likewise.
* testsuite/gas/i386/ilp32/x86-64-addr32.d: Likewise.
* testsuite/gas/i386/x86-64-addr32.s: Add %eiz tests.
opcodes/
* i386-dis.c (OP_E_memory): In 64-bit mode, display eiz for
address with the addr32 prefix and without base nor index
registers.
Since only the first 32 bits of input operand are used for tpause and
umwait, the REX.W bit is skipped. Both 32-bit registers and 64-bit
registers are allowed.
gas/
* testsuite/gas/i386/x86-64-waitpkg.s: Add 32-bit registers
tests for tpause and umwait.
* testsuite/gas/i386/x86-64-waitpkg-intel.d: Updated.
* testsuite/gas/i386/x86-64-waitpkg.d: Likewise.
opcodes/
* i386-dis.c (prefix_table): Replace Em with Edq on tpause and
umwait.
* i386-opc.tbl: Allow 32-bit registers for tpause and umwait in
64-bit mode.
* i386-tbl.h: Regenerated.
Jan Beulich
H.J. Lu
Thomas Troeger
Alan Modra
Jan Beulich
Xuepeng Guo
Igor Tsimbalist