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Just like all Size64 insns are marked Cpu64, all Size32 insns ought to
be marked Cpu386.
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First of all rename the meanwhile misleading Opcode_SIMD_FloatD, as it
has also been used for KMOV* and BNDMOV. Then simplify the condition
selecting which form if "reversing" to use - except for the MOV to/from
control/debug/test registers all extended opcode space insns use bit 0
(rather than bit 1) to indicate the direction (from/to memory) of an
operation. With that, D can simply be set on the first of the two
templates, while the other can be dropped.
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By mistake it was permitted to be used from the very introduction of XOP
support.
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Without it in 16-bit mode a pointless operand size prefix would be
emitted.
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This syntactic sugar is present in both classical and emerging
architectures, like Alpha, SPARC and RISC-V, and assembler macros
doing the same thing can already be found in the wild e.g. [1], proving
the feature's popularity. It's better to provide support directly in the
assembler so downstream users wouldn't have to re-invent this over and
over again.
[1]: https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/loongarch/sysdep.h;h=c586df819cd90;hb=HEAD#l28
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b{lt/ge}[u] forms
Also re-order the jump/branch opcodes while at it, so that insns are
sorted in ascending order according to opcodes, and the label form
preceding the real definition.
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These two macros print either a 16 digit hex number or an 8 digit
hex number. Unfortunately they depend on both target and host, which
means that the output for 32-bit targets may be either 8 or 16 hex
digits.
Replace them in most cases with code that prints a bfd_vma using
PRIx64. In some cases, deliberately lose the leading zeros.
This change some output, notably in base/offset fields of m68k
disassembly which I think looks better that way, and in error
messages. I've kept leading zeros in symbol dumps (objdump -t)
and in PE header dumps.
bfd/
* bfd-in.h (fprintf_vma, sprintf_vma, printf_vma): Delete.
* bfd-in2.h: Regenerate.
* bfd.c (bfd_sprintf_vma): Don't use sprintf_vma.
(bfd_fprintf_vma): Don't use fprintf_vma.
* coff-rs6000.c (xcoff_reloc_type_tls): Don't use sprintf_vma.
Instead use PRIx64 to print bfd_vma values.
(xcoff_ppc_relocate_section): Likewise.
* cofflink.c (_bfd_coff_write_global_sym): Likewise.
* mmo.c (mmo_write_symbols_and_terminator): Likewise.
* srec.c (srec_write_symbols): Likewise.
* elf32-xtensa.c (print_r_reloc): Similarly for fprintf_vma.
* pei-x86_64.c (pex64_dump_xdata): Likewise.
(pex64_bfd_print_pdata_section): Likewise.
* som.c (som_print_symbol): Likewise.
* ecoff.c (_bfd_ecoff_print_symbol): Use bfd_fprintf_vma.
opcodes/
* dis-buf.c (perror_memory, generic_print_address): Don't use
sprintf_vma. Instead use PRIx64 to print bfd_vma values.
* i386-dis.c (print_operand_value, print_displacement): Likewise.
* m68k-dis.c (print_base, print_indexed): Likewise.
* ns32k-dis.c (print_insn_arg): Likewise.
* ia64-gen.c (_opcode_int64_low, _opcode_int64_high): Delete.
(opcode_fprintf_vma): Delete.
(print_main_table): Use PRIx64 to print opcode.
binutils/
* od-macho.c: Replace all uses of printf_vma with bfd_printf_vma.
* objcopy.c (copy_object): Don't use sprintf_vma. Instead use
PRIx64 to print bfd_vma values.
(copy_main): Likewise.
* readelf.c (CHECK_ENTSIZE_VALUES): Likewise.
(dynamic_section_mips_val): Likewise.
(print_vma): Don't use printf_vma. Instead use PRIx64 to print
bfd_vma values.
(dump_ia64_vms_dynamic_fixups): Likewise.
(process_version_sections): Likewise.
* rddbg.c (stab_context): Likewise.
gas/
* config/tc-i386.c (offset_in_range): Don't use sprintf_vma.
Instead use PRIx64 to print bfd_vma values.
(md_assemble): Likewise.
* config/tc-mips.c (load_register, macro): Likewise.
* messages.c (as_internal_value_out_of_range): Likewise.
* read.c (emit_expr_with_reloc): Likewise.
* config/tc-ia64.c (note_register_values): Don't use fprintf_vma.
Instead use PRIx64 to print bfd_vma values.
(print_dependency): Likewise.
* listing.c (list_symbol_table): Use bfd_sprintf_vma.
* symbols.c (print_symbol_value_1): Use %p to print pointers.
(print_binary): Likewise.
(print_expr_1): Use PRIx64 to print bfd_vma values.
* write.c (print_fixup): Use %p to print pointers. Don't use
fprintf_vma.
* testsuite/gas/all/overflow.l: Update expected output.
* testsuite/gas/m68k/mcf-mov3q.d: Likewise.
* testsuite/gas/m68k/operands.d: Likewise.
* testsuite/gas/s12z/truncated.d: Likewise.
ld/
* deffilep.y (def_file_print): Don't use fprintf_vma. Instead
use PRIx64 to print bfd_vma values.
* emultempl/armelf.em (gld${EMULATION_NAME}_finish): Don't use
sprintf_vma. Instead use PRIx64 to print bfd_vma values.
* emultempl/pe.em (gld${EMULATION_NAME}_finish): Likewise.
* ldlang.c (lang_map): Use %V to print region origin.
(lang_one_common): Don't use sprintf_vma.
* ldmisc.c (vfinfo): Don't use fprintf_vma or sprintf_vma.
* pe-dll.c (pe_dll_generate_def_file): Likewise.
gdb/
* remote.c (remote_target::trace_set_readonly_regions): Replace
uses of sprintf_vma with bfd_sprintf_vma.
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This commit enables disassembler styling for AArch64. After this
commit it is possible to have objdump style AArch64 disassembler
output (using --disassembler-color option). Once the required GDB
patches are merged, GDB will also style the disassembler output.
The changes to support styling are mostly split between two files
opcodes/aarch64-dis.c and opcodes/aarch64-opc.c.
The entry point for the AArch64 disassembler can be found in
aarch64-dis.c, this file handles printing the instruction mnemonics,
and assembler directives (e.g. '.byte', '.word', etc). Some operands,
mostly relating to assembler directives are also printed from this
file. This commit changes all of this to pass through suitable
styling information.
However, for most "normal" instructions, the instruction operands are
printed using a two step process. From aarch64-dis.c, in the
print_operands function, the function aarch64_print_operand is called,
this function is in aarch64-opc.c, and converts an instruction operand
into a string. Then, back in print_operands (aarch64-dis.c), the
operand string is printed.
Unfortunately, the string returned by aarch64_print_operand can be
quite complex, it will include syntax elements, like '[' and ']', in
addition to register names and immediate values. In some cases, a
single operand will expand into what will appear (to the user) as
multiple operands separated with a ','.
This makes the task of styling more complex, all these different
components need to by styled differently, so we need to get the
styling information out of aarch64_print_operand in some way.
The solution that I propose here is similar to the solution that I
used for the i386 disassembler.
Currently, aarch64_print_operand uses snprintf to write the operand
text into a buffer provided by the caller.
What I propose is that we pass an extra argument to the
aarch64_print_operand function, this argument will be a structure, the
structure contains a callback function and some state.
When aarch64_print_operand needs to format part of its output this can
be done by using the callback function within the new structure, this
callback returns a string with special embedded markers that indicate
which mode should be used for each piece of text. Back in
aarch64-dis.c we can spot these special style markers and use this to
split the disassembler output up and apply the correct style to each
piece.
To make aarch64-opc.c clearer a series of new static functions have
been added, e.g. 'style_reg', 'style_imm', etc. Each of these
functions formats a piece of text in a different style, 'register' and
'immediate' in this case.
Here's an example taken from aarch64-opc.c of the new functions in
use:
snprintf (buf, size, "[%s, %s]!",
style_reg (styler, base),
style_imm (styler, "#%d", opnd->addr.offset.imm));
The aarch64_print_operand function is also called from the assembler
to aid in printing diagnostic messages. Right now I have no plans to
add styling to the assembler output, and so, the callback function
used in the assembler ignores the styling information and just returns
an plain string.
I've used the source files in gas/testsuite/gas/aarch64/ for testing,
and have manually gone through and checked that the styling looks
reasonable, however, I'm not an AArch64 expert, so it is possible that
the odd piece is styled incorrectly. Please point out any mistakes
I've made.
With objdump disassembler color turned off, there should be no change
in the output after this commit.
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It's entirely unclear why some of the KeyLocker insns had NoRex64 on
them - there's nothing here which could cause emission of REX.W (except
of course a user-specified "rex.w", which we ought to honor anyway).
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This commit adds disassembler styling to the libopcodes ppc
disassembler. This conversion was pretty straight forward, I just
converted the fprintf_func calls to fprintf_styled_func calls and
added an appropriate style.
For testing the new styling I just assembled then disassembled the
source files in gas/testsuite/gas/ppc and manually checked that the
styling looked reasonable.
I think the only slightly weird case was how things like '4*cr1+eq'
are styled. As best I can tell, this construct, used for example in
this instruction:
crand 4*cr1+lt,4*cr1+gt,4*cr1+eq
is used to access a field of a control register. I initially tried
styling this whole construct as a register[1], but during review it
was suggested that instead different parts of the text should have
different styles. In this commit I propose styling '4*cr1+lt' like
this:
4 - immediate,
* - text,
cr1 - register
+ - text
lt - sub-mnemonic
If the user does not request styled output from objdump, then there
should be no change in the disassembler output after this commit.
[1] https://sourceware.org/pipermail/binutils/2022-July/121771.html
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opcodes: Replace old insns with news and generate new relocate types
while macro insns expanding.
opcodes/
loongarch-opc.c
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The MMA instructions use XX3_MASK|3<<21 as an instruction mask, but that
misses the RC bit/bit 31, so if we disassemble a .long that represents an
MMA instruction except that it also has bit 31 set, we will erroneously
disassemble it to that MMA instruction. We create new masks defines that
contain bit 31 so that doesn't happen anymore.
opcodes/
* ppc-opc.c (XACC_MASK, XX3ACC_MASK): New defines.
(P_GER_MASK, xxmfacc, xxmtacc, xxsetaccz, xvi8ger4pp, xvi8ger4,
xvf16ger2pp, xvf16ger2, xvf32gerpp, xvf32ger, xvi4ger8pp, xvi4ger8,
xvi16ger2spp, xvi16ger2s, xvbf16ger2pp, xvbf16ger2, xvf64gerpp,
xvf64ger, xvi16ger2, xvf16ger2np, xvf32gernp, xvi8ger4spp, xvi16ger2pp,
xvbf16ger2np, xvf64gernp, xvf16ger2pn, xvf32gerpn, xvbf16ger2pn,
xvf64gerpn, xvf16ger2nn, xvf32gernn, xvbf16ger2nn, xvf64gernn: Use them.
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A standalone (without SAE) StaticRounding attribute is meaningless, and
indeed all other similar insns have ATTSyntax there instead. I can only
assume this was some strange copy-and-paste mistake.
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I clearly screwed up in 6ff00b5e12e7 ("x86/Intel: correct permitted
operand sizes for AVX512 scatter/gather") giving all AVX512F scatter
insns Dword element size. Update testcases (also their gather parts),
utilizing that there previously were two identical lines each (for no
apparent reason).
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* arc-dis.c (print_insn_arc): Fix thinko.
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Update the ARC disassembler to supply style information to the
disassembler output. The output formatting remains unchanged.
opcodes/ChangeLog:
* disassemble.c (disassemble_init_for_target): Set
created_styled_output for ARC based targets.
* arc-dis.c (find_format_from_table): Use fprintf_styled_ftype
instead of fprintf_ftype throughout.
(find_format): Likewise.
(print_flags): Likewise.
(print_insn_arc): Likewise.
Signed-off-by: Claudiu Zissulescu <claziss@gmail.com>
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Both forms were missing VexW0 (thus allowing Evex.W=1 to be encoded by
suitable means, which would cause #UD). The memory operand form further
was using the wrong Masking value, thus allowing zeroing-masking to be
encoded for the store form (which would again cause #UD).
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This saves quite a number of shift instructions: The "operands" field
can now be retrieved by just masking (no shift), and extracting the
"extension_opcode" field now only requires a (signed) right shift, with
no prereq left one. (Of course there may be architectures where, in a
cross build, there might be no difference at all, e.g. when there are
suitable bitfield extraction insns.)
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Until we update the recommended versions of autoconf/automake, files
should be regenerated with automake-1.15.1 and autoconf-2.69. That's
not because we think those versions are golden, and newer versions are
bad. It's simply because maintainers want to be able to update
configury files without trouble, and if someone regenerates files with
automake-1.16.5 then --enable-maintainer-mode builds will hit errors:
checking that generated files are newer than configure... configure.ac:26: error: version mismatch. This is Automake 1.15.1,
configure.ac:26: but the definition used by this AM_INIT_AUTOMAKE
configure.ac:26: comes from Automake 1.16.5. You should recreate
configure.ac:26: aclocal.m4 with aclocal and run automake again.
WARNING: 'automake-1.15' is probably too old.
Correcting this requires regenerating the files by hand.
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This commit adds disassembler style to the libopcodes s390
disassembler. This conversion was pretty straight forward, I just
converted the fprintf_func calls to fprintf_styled_func calls and
added an appropriate style.
For testing the new styling I just assembled then disassembled the
source files in gas/testsuite/gas/s390 and manually checked that the
styling looked reasonable.
If the user does not request styled output from objdump, then there
should be no change in the disassembler output after this commit.
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This commit adds Zfhmin and Zhinxmin extensions (subsets of Zfh and
Zhinx extensions, respectively). In the process supporting Zfhmin and
Zhinxmin extension, this commit also changes how instructions are
categorized considering Zfhmin, Zhinx and Zhinxmin extensions.
Detailed changes,
* From INSN_CLASS_ZFH to INSN_CLASS_ZFHMIN:
flh, fsh, fmv.x.h and fmv.h.x.
* From INSN_CLASS_ZFH to INSN_CLASS_ZFH_OR_ZHINX:
fmv.h.
* From INSN_CLASS_ZFH_OR_ZHINX to INSN_CLASS_ZFH_OR_ZHINX:
fneg.h, fabs.h, fsgnj.h, fsgnjn.h, fsgnjx.h,
fadd.h, fsub.h, fmul.h, fdiv.h, fsqrt.h, fmin.h, fmax.h,
fmadd.h, fnmadd.h, fmsub.h, fnmsub.h,
fcvt.w.h, fcvt.wu.h, fcvt.h.w, fcvt.h.wu,
fcvt.l.h, fcvt.lu.h, fcvt.h.l, fcvt.h.lu,
feq.h, flt.h, fle.h, fgt.h, fge.h,
fclass.h.
* From INSN_CLASS_ZFH_OR_ZHINX to INSN_CLASS_ZFHMIN_OR_ZHINXMIN:
fcvt.s.h and fcvt.h.s.
* From INSN_CLASS_D_AND_ZFH_INX to INSN_CLASS_ZFHMIN_AND_D:
fcvt.d.h and fcvt.h.d.
* From INSN_CLASS_Q_AND_ZFH_INX to INSN_CLASS_ZFHMIN_AND_Q:
fcvt.q.h and fcvt.h.q.
bfd/ChangeLog:
* elfxx-riscv.c (riscv_implicit_subsets): Change implicit
subsets. Zfh->Zicsr is not needed and Zfh->F is replaced with
Zfh->Zfhmin and Zfhmin->F. Zhinx->Zicsr is not needed and
Zhinx->Zfinx is replaced with Zhinx->Zhinxmin and
Zhinxmin->Zfinx.
(riscv_supported_std_z_ext): Added zfhmin and zhinxmin.
(riscv_multi_subset_supports): Rewrite handling for new
instruction classes.
(riscv_multi_subset_supports_ext): Updated.
(riscv_parse_check_conflicts): Change error message to include
zfh and zfhmin extensions.
gas/ChangeLog:
* testsuite/gas/riscv/zfhmin-d-insn-class-fail.s: New complex
error handling test.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-1.d: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-1.l: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-2.d: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-2.l: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-3.d: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-3.l: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-4.d: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-4.l: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-5.d: Likewise.
* testsuite/gas/riscv/zfhmin-d-insn-class-fail-5.l: Likewise.
* testsuite/gas/riscv/zhinx.d: Renamed from fp-zhinx-insns.d
and refactored.
* testsuite/gas/riscv/zhinx.s: Likewise.
include/ChangeLog:
* opcode/riscv.h (enum riscv_insn_class): Removed INSN_CLASS_ZFH,
INSN_CLASS_D_AND_ZFH_INX and INSN_CLASS_Q_AND_ZFH_INX. Added
INSN_CLASS_ZFHMIN, INSN_CLASS_ZFHMIN_OR_ZHINXMIN,
INSN_CLASS_ZFHMIN_AND_D and INSN_CLASS_ZFHMIN_AND_Q.
opcodes/ChangeLog:
* riscv-opc.c (riscv_opcodes): Change instruction classes for
Zfh and Zfhmin instructions. Fix `fcvt.h.lu' instruction
(two operand variant) mask.
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This commit fixes floating point operand register names from ABI ones
to dynamically set ones.
gas/ChangeLog:
* testsuite/gas/riscv/zfinx-dis-numeric.s: Test new behavior of
Zfinx extension and -M numeric disassembler option.
* testsuite/gas/riscv/zfinx-dis-numeric.d: Likewise.
opcodes/ChangeLog:
* riscv-dis.c (riscv_disassemble_insn): Use dynamically set GPR
names to disassemble Zfinx instructions.
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This once again allows to reduce redundancy in (and size of) the opcode
table.
Don't go as far as also making D work on the two 5-operand XOP insns:
This would significantly complicate the code, as there the first
(immediate) operand would need special treatment in several places.
Note that the .s suffix isn't being enabled to have any effect, for
being deprecated. Whereas neither {load} nor {store} pseudo prefixes
make sense here, as the respective operands are inputs (loads) only
anyway, regardless of order. Hence there is (as before) no way for the
programmer to request the alternative encoding to be used for register-
only insns.
Note further that it is always the first original template which is
retained (and altered), to make sure the same encoding as before is
used for register-only insns. This has the slightly odd (but pre-
existing) effect of XOP register-only insns having XOP.W clear, but FMA4
ones having VEX.W set.
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* disassemble.c: (disassemble_init_for_target): Set
created_styled_output for AVR based targets.
* avr-dis.c: (print_insn_avr): Use fprintf_styled_ftype
instead of fprintf_ftype throughout.
(avr_operand): Pass in and fill disassembler_style when
parsing operands.
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The only case where 64-bit code uses non-sign-extended (can also be
considered zero-extended) displacements is when an address size override
is in place for a memory operand (i.e. particularly excluding
displacements of direct branches, which - if at all - are controlled by
operand size, and then are still sign-extended, just from 16 bits).
Hence the distinction in templates is unnecessary, allowing code to be
simplified in a number of places. The only place where logic becomes
more complicated is when signed-ness of relocations is determined in
output_disp().
The other caveat is that Disp64 cannot be specified anymore in an insn
template at the same time as Disp32. Unlike for non-64-bit mode,
templates don't specify displacements for both possible addressing
modes; the necessary adjustment to the expected ones has already been
done in match_template() anyway (but of course the logic there needs
tweaking now). Hence the single template so far doing so is split.
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Commit 7d5e4556a375 rendered the check near the end of what is now
i386_finalize_displacement() entirely dead for AT&T mode, since for
operands involving a displacement .unspecified will always be set. But
the logic there is bogus anyway - Intel syntax operand size specifiers
are of no interest there either. The only thing which matters in the
"displacement only" determination is .baseindex.
Of course when masking displacement kinds we should not at the same time
also mask off other attributes.
Furthermore the type mask returned by lex_got() also needs to be
adjusted: The only case where we want Disp32 (rather than Disp32S) is
when dealing with 32-bit addressing mode in 64-bit code.
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The function aarch64_print_operand (aarch64-opc.c) is responsible for
converting an instruction operand into the textual representation of
that operand.
In some cases, a comment is included in the operand representation,
though this (currently) only happens for the last operand of the
instruction.
In a future commit I would like to enable the new libopcodes styling
for AArch64, this will allow objdump and GDB[1] to syntax highlight
the disassembler output, however, having operands and comments
combined in a single string like this makes such styling harder.
In this commit, I propose to extend aarch64_print_operand to take a
second buffer. Any comments for the instruction are written into this
extra buffer. The two callers of aarch64_print_operand are then
updated to pass an extra buffer, and print any resulting comment.
In this commit no styling is added, that will come later. However, I
have adjusted the output slightly. Before this commit some comments
would be separated from the instruction operands with a tab character,
while in other cases the comment was separated with two single spaces.
After this commit I use a single tab character in all cases. This
means a few test cases needed updated. If people would prefer me to
move everyone to use the two spaces, then just let me know. Or maybe
there was a good reason why we used a mix of styles, I could probably
figure out a way to maintain the old output exactly if that is
critical.
Other than that, there should be no user visible changes after this
commit.
[1] GDB patches have not been merged yet, but have been posted to the
GDB mailing list:
https://sourceware.org/pipermail/gdb-patches/2022-June/190142.html
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Presumably this being there was a result of taking CALL as a reference
when adding the RTM insns. But with No_qSuf the attribute has no effect.
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Commit 04f096fb9e25 ("Move the xc16x target to the obsolete list") moved
the architecture from the "obsolete but still available" to the
"obsolete / support removed" list in config.bfd, making the architecture
impossible to enable (except maybe via "enable everything" options").
Note that I didn't touch */po/*.po{,t} on the assumption that these
would be updated by some (half)automatic means.
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According to the picture 28.1 in the current ISA spec, h is no larger the
multi-letter extension, it is a single extension after v. Therefore, this
patch fix the implementation, and use the single h to control hypervisor
CSRs and instructions, which we promised to do before.
bfd/
* elfxx-riscv.c (riscv_supported_std_ext): Added h with version 1.0 after v.
(riscv_supported_std_h_ext): Removed.
(riscv_all_supported_ext): Updated since riscv_supported_std_h_ext is removed.
(riscv_prefix_ext_class): Removed RV_ISA_CLASS_H.
(parse_config): Updated since riscv_prefix_ext_class is removed.
(riscv_recognized_prefixed_ext): Likewise.
(riscv_get_default_ext_version): Likewise.
(riscv_multi_subset_supports): Handle INSN_CLASS_H for hypervisor instructions.
(riscv_multi_subset_supports_ext): Likewise.
gas/
* config/tc-riscv.c (riscv_csr_class): Added CSR_CLASS_H and CSR_CLASS_H_32 for
hypervisor CSRs.
(riscv_csr_address): Likewise.
* testsuite/gas/riscv/csr-version-1p10.d: Updated since hypervisor CSRs are
controlled by single h extension for now.
* testsuite/gas/riscv/csr-version-1p10.l: Likewise.
* testsuite/gas/riscv/csr-version-1p11.d: Likewise.
* testsuite/gas/riscv/csr-version-1p11.l: Likewise.
* testsuite/gas/riscv/csr-version-1p12.d: Likewise.
* testsuite/gas/riscv/csr-version-1p12.l: Likewise.
* testsuite/gas/riscv/csr-version-1p9p1.d: Likewise.
* testsuite/gas/riscv/csr-version-1p9p1.l: Likewise.
* testsuite/gas/riscv/h-ext-32.d: Added h to architecture string.
* testsuite/gas/riscv/h-ext-64.d: Likewise.
* testsuite/gas/riscv/march-fail-single-prefix-h: Removed since h is no
longer multi-letter extension.
* testsuite/gas/riscv/march-fail-unknown-h.d: Likewise.
include/
* opcode/riscv-opc.h: Control hypervisor CSRs by h extension, rather than
the privileged spec verisons.
* opcode/riscv.h (riscv_insn_class): Added INSN_CLASS_H.
opcodes/
* riscv-opc.c (riscv_opcodes): Control hypervisor instructions by h extension.
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For quite some time all callers have been passing 1 / true. While there
fold the final oappend_with_style() calls.
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Commit 384e201e5aec ("x86: properly initialize struct instr_info
instance(s)") was based on an improperly refreshed patch. Correct the
oversight.
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With its movement to the stack, and with the subsequent desire to
initialize the entire instr_info instances, this has become doubly
inefficient. Individual users have better knowledge of how big a buffer
they need, and in a number of cases going through an intermediate buffer
can be avoided altogether.
Having got confirmation that it wasn't intentional to print memory
operand displacements with inconsistent style, print_displacement() is
now using dis_style_address_offset consistently (eliminating the need
for callers to pass in a style).
While touching print_operand_value() also convert its "hex" parameter to
bool. And while altering (and moving) oappend_immediate(), fold
oappend_maybe_intel_with_style() into its only remaining caller. Finally
where doing adjustments, use snprintf() in favor of sprintf().
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Now that op_out[] is an array of pointers, there's no need anymore to
copy strings. Simply swap the pointers.
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By changing the values used for "artificial" prefix values,
all_prefixes[] can be shrunk to array of unsigned char. All that
additionally needs adjusting is the printing of possible apparently
standalone prefixes when recovering from longjmp(): Simply check
whether any prefixes were successfully decoded, to avoid converting
opcode bytes matching the "artificial" values to prefix mnemonics.
Similarly by re-arranging the bits assigned to PREFIX_* mask values
we can fit all segment register masks in a byte and hence shrink
active_seg_prefix to unsigned char.
Somewhat similarly with last_*_prefix representing offsets into the
opcode being disassembled, signed char is sufficient to hold all possible
values.
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Commit 39fb369834a3 ("opcodes: Make i386-dis.c thread-safe") introduced
a lot of uninitialized data. Alan has in particular observed ubsan
taking issue with the loop inverting the order of operands, where
op_riprel[] - an array of bool - can hold values other than 0 or 1.
Move instantiation of struct instr_info into print_insn() (thus having
just a single central point), and make use of C99 dedicated initializers
to fill fields right in the initializer where possible. This way all
fields not explicitly initialized will be zero-filled, which in turn
allows dropping of some other explicit initialization later in the
function or in ckprefix(). Additionally this removes a lot of
indirection, as all "ins->info" uses can simply become "info".
Make one further arrangement though, to limit the amount of data needing
(zero)initializing on every invocation: Convert the op_out structure
member to just an array of pointers, with the actual arrays living
inside print_insn() (and, as befoe, having just their 1st char filled
with nul).
While there, instead of adjusting print_insn()'s forward declaration,
arrange for no such declaration to be needed in the first place.
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The i386 disassembler is pretty complex. Most disassembly is done
indirectly; operands are built into buffers within a struct instr_info
instance, before finally being printed later in the disassembly
process.
Sometimes the operand buffers are built in a different order to the
order in which they will eventually be printed.
Each operand can contain multiple components, e.g. multiple registers,
immediates, other textual elements (commas, brackets, etc).
When looking for how to apply styling I guess the ideal solution would
be to move away from the operands being a single string that is built
up, and instead have each operand be a list of "parts", where each
part is some text and a style. Then, when we eventually print the
operand we would loop over the parts and print each part with the
correct style.
But it feels like a huge amount of work to move from where we are
now to that potentially ideal solution. Plus, the above solution
would be pretty complex.
So, instead I propose a .... different solution here, one that works
with the existing infrastructure.
As each operand is built up, piece be piece, we pass through style
information. This style information is then encoded into the operand
buffer (see below for details). After this the code can continue to
operate as it does right now in order to manage the set of operand
buffers.
Then, as each operand is printed we can split the operand buffer into
chunks at the style marker boundaries, with each chunk being printed
with the correct style.
For encoding the style information I use a single character, currently
\002, followed by the style encoded as a single hex digit, followed
again by the \002 character.
This of course relies on there not being more than 16 styles, but that
is currently true, and hopefully will remain true for the foreseeable
future.
The other major concern that has arisen around this work is whether
the escape character could ever be encountered in output naturally
generated by the disassembler. If this did happen then the escape
characters would be stripped from the output, and the wrong styling
would be applied.
However, I don't believe that this is currently a problem.
Disassembler content comes from a number of sources. First there's
content that copied directly from the i386-dis.c file, this is things
like register names, and other syntax elements (brackets, commas,
etc). We can easily check that the i386-dis.c file doesn't contain
our special character.
The next source of content are immediate operands. The text for these
operands is generated by calls into libc. By selecting a
non-printable character we can be confident that this is not something
that libc will generate as part of an immediate representation.
The other output that appears to be from the disassembler is operands
that contain addresses and (possibly) symbol names. It is quite
possible that a symbol name might contain any special character we
could imagine, so is this a problem?
I don't think it is, we don't actually print address and symbol
operands through the disassembler, instead, the disassembler calls
back to the user (objdump, gdb, etc) to print the address and symbol
on its behalf. This content is printed directly to the output stream,
it does not pass through the i386 disassembler output buffers. As a
result, we never check this particular output for styling escape
characters.
In some (not very scientific) benchmarking on my machine,
disassembling a reasonably large (142M) shared library, I'm not seeing
any significant slow down in disassembler speed with this change.
Most instructions are now being fully syntax highlighted when I
disassemble using the --disassembler-color=extended-color option. I'm
sure that there are probably still a few corner cases that need fixing
up, but we can come back to them later I think.
When disassembler syntax highlighting is not being used, then there
should be no user visible changes after this commit.
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The zhinx extension is a sub-extension in zfinx, corresponding to
zfh extension but use GPRs instead of FPRs.
This patch expanded the zfh insn class define, since zfh and zhinx
use the same opcodes, thanks for Nelson's works.
changelog in V2: Add missing classes of 'zfh' and 'zhinx' in
"riscv_multi_subset_supports_ext".
bfd/ChangeLog:
* elfxx-riscv.c (riscv_multi_subset_supports): New extensions.
(riscv_multi_subset_supports_ext): New extensions.
gas/ChangeLog:
* testsuite/gas/riscv/fp-zhinx-insns.d: New test.
* testsuite/gas/riscv/fp-zhinx-insns.s: New test.
include/ChangeLog:
* opcode/riscv.h (enum riscv_insn_class): New INSN classes.
opcodes/ChangeLog:
* riscv-opc.c: Modify INSN_CLASS.
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While working on another patch[1] I had need to touch this code in
i386-dis.c:
ins->obufp = ins->mnemonicendp;
for (i = strlen (ins->obuf) + prefix_length; i < 6; i++)
oappend (ins, " ");
oappend (ins, " ");
(*ins->info->fprintf_styled_func)
(ins->info->stream, dis_style_mnemonic, "%s", ins->obuf);
What this code does is add whitespace after the instruction mnemonic
and before the instruction operands.
The problem I ran into when working on this code can be seen by
assembling this input file:
.text
nop
retq
Now, when I disassemble, here's the output. I've replaced trailing
whitespace with '_' so that the issue is clearer:
Disassembly of section .text:
0000000000000000 <.text>:
0: 90 nop
1: c3 retq___
Notice that there's no trailing whitespace after 'nop', but there are
three spaces after 'retq'!
What happens is that instruction mnemonics are emitted into a buffer
instr_info::obuf, then instr_info::mnemonicendp is setup to point to
the '\0' character at the end of the mnemonic.
When we emit the whitespace, this is then added starting at the
mnemonicendp position. Lets consider 'retq', first the buffer is
setup like this:
'r' 'e' 't' 'q' '\0'
Then we add whitespace characters at the '\0', converting the buffer
to this:
'r' 'e' 't' 'q' ' ' ' ' ' ' '\0'
However, 'nop' is actually an alias for 'xchg %rax,%rax', so,
initially, the buffer is setup like this:
'x' 'c' 'h' 'g' '\0'
Then in NOP_Fixup we spot that we have an instruction that is an alias
for 'nop', and adjust the buffer to this:
'n' 'o' 'p' '\0' '\0'
The second '\0' is left over from the original buffer contents.
However, when we rewrite the buffer, we don't afjust mnemonicendp,
which still points at the second '\0' character.
Now, when we insert whitespace we get:
'n' 'o' 'p' '\0' ' ' ' ' ' ' ' ' '\0'
Notice the whitespace is inserted after the first '\0', so, when we
print the buffer, the whitespace is not printed.
The fix for this is pretty easy, I can change NOP_Fixup to adjust
mnemonicendp, but now a bunch of tests start failing, we now produce
whitespace after the 'nop', which the tests don't expect.
So, I could update the tests to expect the whitespace....
...except I'm not a fan of trailing whitespace, so I'd really rather
not.
Turns out, I can pretty easily update the whitespace emitting code to
spot instructions that have zero operands and just not emit any
whitespace in this case. So this is what I've done.
I've left in the fix for NOP_Fixup, I think updating mnemonicendp is
probably a good thing, though this is not really required any more.
I've then updated all the tests that I saw failing to adjust the
expected patterns to account for the change in whitespace.
[1] https://sourceware.org/pipermail/binutils/2022-April/120610.html
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Requiring C99 means that uses of bfd_uint64_t can be replaced with
uint64_t, and similarly for bfd_int64_t, BFD_HOST_U_64_BIT, and
BFD_HOST_64_BIT. This patch does that, removes #ifdef BFD_HOST_*
and tidies a few places that print 64-bit values.
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As a preparatory step to allowing proper non-operand forms of specifying
embedded rounding / SAE, convert the internal representation to non-
operand form. While retaining properties (and in a few cases perhaps
providing more meaningful diagnostics), this means doing away with a few
hundred standalone templates, thus - as a nice side effect - reducing
memory consumption / cache occupancy.
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MASM doesn't consider {sae} and alike a separate operand; it is attached
to the last register operand instead, just like spelled out by the SDM.
Make the disassembler follow this first, before also adjusting the
assembler (such that it'll be easy to see that the assembler change
doesn't alter generated code).
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MASM doesn't support the {1to<n>} form; DWORD BCST (paralleling
DWORD PTR) and alike are to be used there instead. Make the disassembler
follow this first, before also adjusting the assembler (such that it'll
be easy to see that the assembler change doesn't alter generated code).
For VFPCLASSP{S,D,H} and vector conversions with shrinking element sizes
the original {1to<n>} operand suffix is retained, to disambiguate
output. I have no insight (yet) into how MASM expects those to be
disambiguated.
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Per Power ISA Version 3.1B 3.3.12, isel uses BC field rather than CRB
field present in binutils sources. Also, per 1.6.2, BC has the same
semantics as BA and BB fields, so this should keep the same flags and
mask, only with the different offset.
opcodes/
* ppc-opc.c
(BC): Define new field, with the same definition as CRB field,
but with the PPC_OPERAND_CR_BIT flag present.
gas/
* testsuite/gas/ppc/476.d: Update.
* testsuite/gas/ppc/a2.d: Update.
* testsuite/gas/ppc/e500.d: Update.
* testsuite/gas/ppc/power7.d: Update.
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With the upcoming SVP64 extension[0] to PowerPC architecture, it became
evident that PowerPC operand indices no longer fit 8 bits. This patch
switches the underlying type to uint16_t, also introducing a special
typedef so that any future extension goes even smoother.
[0] https://libre-soc.org
include/
* opcode/ppc.h (ppc_opindex_t): New typedef.
(struct powerpc_opcode): Use it.
(PPC_OPINDEX_MAX): Define.
gas/
* write.h (struct fix): Increase size of fx_pcrel_adjust.
Reorganise.
* config/tc-ppc.c (insn_validate): Use ppc_opindex_t for operands.
(md_assemble): Likewise.
(md_apply_fix): Likewise. Mask fx_pcrel_adjust with PPC_OPINDEX_MAX.
(ppc_setup_opcodes): Adjust opcode index assertion.
opcodes/
* ppc-dis.c (skip_optional_operands): Use ppc_opindex_t for
operand pointer.
(lookup_powerpc, lookup_prefix, lookup_vle, lookup_spe2): Likewise.
(print_insn_powerpc): Likewise.
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Update zfinx implement with zicsr, fix missing fcsr use by zfinx.
add zicsr imply by zfinx.
bfd/ChangeLog:
* elfxx-riscv.c: New imply.
gas/ChangeLog:
* testsuite/gas/riscv/csr-insns-pseudo-zfinx.d: New test.
opcodes/ChangeLog:
* riscv-opc.c: Update insn class.
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As fmv.x.q and fmv.q.x instructions are RV128-only (not RV64-only),
it should be removed until RV128 support for GNU Binutils is required
again.
gas/ChangeLog:
* testsuite/gas/riscv/fmv.x.q-rv64-fail.d: New failure test.
* testsuite/gas/riscv/fmv.x.q-rv64-fail.l: Likewise.
* testsuite/gas/riscv/fmv.x.q-rv64-fail.s: Likewise.
include/ChangeLog:
* opcode/riscv-opc.h (MATCH_FMV_X_Q, MASK_FMV_X_Q,
MATCH_FMV_Q_X, MASK_FMV_Q_X): Remove RV128-only instructions.
opcodes/ChangeLog:
* riscv-opc.c (riscv_opcodes): Remove RV128-only instructions.
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