Peter Johnson [Mon, 10 Oct 2005 03:47:58 +0000 (03:47 -0000)]
Update all re2c input files to use case-insensitive strings. The code
generated for this is identical to the old A=[aA] way of doing this, but
this way is easier to read.
Peter Johnson [Sun, 9 Oct 2005 07:11:45 +0000 (07:11 -0000)]
Continue re2c updates. This one gets rid of the unused label warnings.
Going ahead and removing the cleanup script; a later commit will get rid
of the remaining unused variable warnings that the cleanup script took care
of as well.
Peter Johnson [Sun, 9 Oct 2005 06:08:02 +0000 (06:08 -0000)]
Update re2c to May 12, 2004 version. This adds an output file option, so
also adjust cleanup program to take input/output file name, and update
Makefiles to use it in this fashion.
Peter Johnson [Fri, 7 Oct 2005 05:15:52 +0000 (05:15 -0000)]
* x86arch.h (x86_insn): Combine shift_op, signext_imm8_op, shortmov_op, and
address16_op flags into a single postop enum.
* x86id.re (yasm_x86__finalie_insn): Set new enum rather than flags.
* x86bc.c: Use new combined enum.
Peter Johnson [Wed, 5 Oct 2005 06:57:37 +0000 (06:57 -0000)]
* x86id.re: Implement string, protection, SSE2 instructions for GAS mode.
While we're here, add 64-bit register versions of SSE2 instructions movmskps,
pextrw, pinsrw, and pmovmskb that are documented by Intel but not AMD.
Peter Johnson [Mon, 3 Oct 2005 06:49:15 +0000 (06:49 -0000)]
* bytecode.c (bc_align_tobytes): Handle cases where some code fills don't
exist (this happens in LC3b).
* lc3barch.c (lc3b_get_fill): NOP pattern is actually all 0's.
* gas-parser.h (yasm_parser_gas): Add code_section flag to indicate when to
use code fill vs. data fill.
* gas-parser.c: Initialize flag.
* gas-bison.y: Update flag in various places. Generate org bytecode.
Call gas_parser_align to generate align bytecode.
(gas_parser_align): Generate align bytecode.
Peter Johnson [Mon, 3 Oct 2005 00:12:08 +0000 (00:12 -0000)]
* x86id.re (push_insn): Turn on signed 8-bit optimization for GAS mode.
Don't do this yet for NASM mode; this could be done e.g. through use of
the strict modifier.
Peter Johnson [Sat, 1 Oct 2005 05:47:54 +0000 (05:47 -0000)]
Revert [1251]. From further investigation, ML64's generation of REL32 in
these cases seems to be a bug. If you get a linker error about ADDR32, it
means you aren't using RIP-relative instructions. Note this means to access
an array you need to do:
lea rax, [var wrt rip] ; generates RIP-relative insn and REL32 reloc
mov rcx, [rax+rbx] ; rbx is index
and not:
mov rcx, [var+rbx] ; generates ADDR32 reloc
At least when trying to build a DLL (the ADDR32 reloc fails the DLL link).
When building statically, ADDR32 should work okay and thus the latter form
can be used.
Peter Johnson [Fri, 30 Sep 2005 04:03:59 +0000 (04:03 -0000)]
* coff-objfmt.c (coff_objfmt_output_expr): Try to match the new ML64's
output better by generating relocs directly to the symbol being relocated
rather than to the section. Use a new coff_objfmt->win64 flag to
conditionalize this rather than just COFF_MACHINE_AMD64.
(coff_objfmt): New win64 flag.
(coff_objfmt_create, win32_objfmt_create, win64_objfmt_create): Initialize
flag.
(coff_objfmt_output): Turn on outputting all symbols in win64 mode so they
can be referenced by relocs. This isn't quite correct: we should only turn
on the symbols that are actually used by relocs, but having them there
doesn't hurt linking; it only exposes all of the internal symbol names.
With these changes, yasm output matches the new ML64 output except for a
very few cases:
- ML64 generates REL32 relocs when referencing objects in the same .text
section. I cannot see how this is necessary because call instructions
don't generate REL32 relocs! I currently do not plan on fixing this unless
it causes a problem.
- ML64 generates ADDR32 relocs instead of REL32 relocs when loading a
32-bit register with the address of an object. I will probably try to fix
this.
Peter Johnson [Thu, 29 Sep 2005 05:13:26 +0000 (05:13 -0000)]
* x86id.re: Unbreak movq for NASM parser. I accidentally overrode it when
defining the mov forms for GAS. While I'm here, fix movq so it also
supports the 64-bit move registers (per Intel's spec, AMD has it under movd)
and copy the MMX/SSE2 versions of movq into mov so they're visible to the
GAS parser (and only the GAS parser).
Add a whole bunch of testcases to test movd and movq in both 32 bit and 64
bit modes for both GAS and NASM parsers.
Peter Johnson [Wed, 28 Sep 2005 05:50:51 +0000 (05:50 -0000)]
- Add win64 as an alias for -f win32 -m amd64.
- Add elf32 as an alias for -f elf.
- Add elf64 as an alias for -f elf -m amd64.
Note the old command lines still work.
Add a testcase for win64 (includes masm -> yasm mapping, look at
win64-dataref.masm and win64-dataref.asm files respectively).
Peter Johnson [Wed, 28 Sep 2005 03:23:24 +0000 (03:23 -0000)]
* coff-objfmt.c (coff_objfmt_output_expr): Change relocations output for
instructions in Win64 to always be REL32 regardless of whether they're
RIP relative or not. I don't understand this behavior, but it matches how
ML64 generates relocs and unbreaks linking. The handling of this case must
be handled at a higher level somehow (either at the linker or the compiler).
Note that this REL32 generation behavior of ML64 happens only with the
latest version (VC8); the 2003 SP1 SDK ML64 doesn't do this.
* bytecode.c (yasm_bc_is_data): New supporting function.
* bytecode.h (yasm_bc_is_data): Prototype.
Testcase pending.
Reported by and much debugging support contributed by:
Brian Gladman <brg@gladman.plus.com>. Thanks!
Peter Johnson [Tue, 27 Sep 2005 07:07:07 +0000 (07:07 -0000)]
Split arch module parse_check_id into parse_check_reg, parse_check_reggroup,
parse_check_segreg, parse_check_insn, parse_check_prefix, and
parse_check_targetmod. This will allow for future improvements to
identifier handling in the various parsers.
Peter Johnson [Tue, 27 Sep 2005 03:46:34 +0000 (03:46 -0000)]
* gas-bison.y: Allow .data, .text, and .bss to be used in expressions (they
come through as unique directive tokens, not as DIR_ID).
* dataref-imm.*: Test for this.
Peter Johnson [Mon, 26 Sep 2005 07:52:25 +0000 (07:52 -0000)]
* x86id.re (DEF_INSN_DATA): OR in data[3] rather than setting it directly.
(yasm_x86__finalize_insn): Ignore special suffix value 0x80 when matching
in info, but use strict matching. This unbreaks jmp/call broken in previous
commit.
(yasm_x86__parse_check_insn): Initialize data[3] and for FLDT and FSTPT, set
special suffix value 0x80.
Peter Johnson [Mon, 26 Sep 2005 07:06:27 +0000 (07:06 -0000)]
* x86id.re: Implement GAS handling for floating point, some extensions,
interrupts, conditional movs/sets, and a few other minor things. What's
left: string insns, loop insns, other jmp/call forms, protection control,
SSE/SSE2, and odds and ends (like prefixes-as-instructions).
Peter Johnson [Mon, 26 Sep 2005 04:17:09 +0000 (04:17 -0000)]
* x86expr.c (yasm_x86__expr_checkea): Add address16_op parameter to avoid
errors when using enter in 64-bit mode.
* x86arch.h (yasm_x86__expr_checkea): Update prototype.
* x86bc.c (x86_bc_insn_resolve, x86_bc_insn_tobytes): Pass flag to above.
* x86id.re: Implement mul, imul, div, idiv, enter, leave for GAS mode.
Add tests for above.
Peter Johnson [Sun, 25 Sep 2005 04:25:26 +0000 (04:25 -0000)]
Preliminary GAS parser. Only a few instructions are supported at present.
This work is being done under contract with a company that has requested
to remain unnamed at the present time.
* bc-int.h (yasm_effaddr): Add strong flag to indicate if the effective
address is definitely an effective address; GAS does not use [] to designate
effective addresses so it's otherwise impossible to tell the difference
between "expr(,1)" and just "expr" (important for the relative jump
instructions).
* bytecode.h (yasm_ea_set_strong): New function to set the strong flag.
* bytecode.c (yasm_ea_set_strong): Implementation.
* x86bc.c (yasm_x86__ea_create_reg): Initialize strong flag.
* arch.h (yasm_insn_operand): Add deref flag to indicate use of "*foo" in
GAS syntax.
* arch.c (yasm_operand_create_reg, yasm_operand_create_segreg)
(yasm_operand_create_mem, yasm_operand_create_imm): Set deref flag to 0.
* gas: GAS syntax lexer and parser. Not all directives are implemented yet
(some will require additional core bytecodes).
* elf-objfmt.c (elf_objfmt_section_switch): Add support for GAS-style
section flags.
* x86arch.h (yasm_arch_x86): Add parser setting.
* x86arch.c (x86_create): Check for gas parser and initialize setting.
* x86bc.c (yasm_x86__ea_create_expr): Transform val+RIP to val wrt RIP when
using the GAS parser (this is how GAS interprets "expr(%rip)").
* x86id.re: Too many changes to enumerate in detail. Add new modifiers for
GAS suffixes. Start using them in a couple instructions. Split check_id
into subfunctions (still one entry point at present).
(yasm_x86__finalize_insn): Support new modifiers, reverse operands, derefs.
* yasm.c (main): Change all undef to extern when using GAS parser (this is
default GAS behavior).
Peter Johnson [Sun, 25 Sep 2005 03:20:54 +0000 (03:20 -0000)]
* arch.h (yasm_arch_check_id_retval): Add YASM_ARCH_CHECK_ID_REGGROUP to
represent a register group (e.g. indexed registers).
(yasm_arch_reggroup_get_reg): New function to get a specific register from
a register group and index.
(yasm_arch_module): Add module version of yasm_arch_reggroup_get_reg().
* lc3barch.c (lc3b_reggroup_get_reg): Implement.
(yasm_lc3b_LTX_arch): Point to implementation.
* x86arch.c (x86_reggroup_get_reg, yasm_x86_LTX_arch): Likewise.
Peter Johnson [Sun, 25 Sep 2005 01:01:02 +0000 (01:01 -0000)]
* symrec.h (yasm_symtab_parser_finalize): Add function to declare all
undefined symbols extern if unused rather than causing undef errors.
* symrec.c (yasm_symtab_parser_finalize): Implement.
(symtab_finalize_info): New (more data to pass to
(symtab_parser_finalize_checksym): Update finalize helper.
* yasm.c (main): Update call to yasm_symtab_parser_finalize().
Peter Johnson [Sun, 25 Sep 2005 00:41:04 +0000 (00:41 -0000)]
* arch.h (yasm_arch_syntax_flavor): Remove.
(yasm_arch_create): Add parser and error parameters; now the arch is given
the keyword of the parser in use. The error parameter allows the caller to
find out whether it was the machine name or the parser name that was in
error.
(yasm_arch_module): Change create definition to match yasm_arch_create().
(yasm_arch_create_error): New error typedef for yasm_arch_create() errors.
* lc3barch.c (lc3b_create): Update to match new yasm_arch_create().
* x86arch.c (x86_create): Likewise.
* yasm.c (main): Use new yasm_arch_create() and handle the two kinds of
errors it can now generate. Move parser creation up in the sequence so it
happens before the arch is created.
Peter Johnson [Sun, 25 Sep 2005 00:09:30 +0000 (00:09 -0000)]
* yasm.c (main): Add workaround for when -m amd64 is specified to override
the object format default BITS setting. This makes it so [bits 64] is not
necessary to explicitly specify in the source file.
Peter Johnson [Sat, 24 Sep 2005 23:50:09 +0000 (23:50 -0000)]
* x86bc.c (x86_bc_insn_resolve): Actually support the flag to allow
shortening to signed 8-bit immediate from a larger immediate size. This
yields much smaller code for many arithmetic instructions.
Peter Johnson [Thu, 8 Sep 2005 05:01:32 +0000 (05:01 -0000)]
* elf-objfmt.c (elf_objfmt_output_section): Don't try to skip empty
sections. This breaks section numbering between the file section headers
and the section numbering used by symbols to reference sections.
While we're here, don't even try to number sections during parse... this
numbering is getting overwritten anyway.
Peter Johnson [Wed, 7 Sep 2005 03:53:38 +0000 (03:53 -0000)]
* expr.c (expr_level_op): Fix corruption with certain types of complex
expressions by adjusting level_numterms if expr_simplify_identity changes
fold_numterms.
Peter Johnson [Mon, 5 Sep 2005 20:53:07 +0000 (20:53 -0000)]
* hamt.c: Use uintptr_t to correctly cast to integer from pointer. On some
platforms (notably Win64), unsigned long is not big enough to hold a
pointer.
* Makefile.am, configure.ac: Use ax_create_stdint_h to get us uintptr_t.
* ax_create_stdint_h.m4: Implementation of ax_create_stdint_h autoconf
macro from http://ac-archive.sourceforge.net/guidod/ax_create_stdint_h.html
Peter Johnson [Sat, 27 Aug 2005 02:05:36 +0000 (02:05 -0000)]
* bytecode.c (bc_incbin_tobytes): Fix fread call so that return value check
works (was broken for >1 byte files).
(yasm_bc_tobytes): Fix handling of bytecodes that are larger than provided
buffer.
Patch by: Stephen Polkowski <stephen@centtech.com>
Peter Johnson [Thu, 4 Aug 2005 07:53:10 +0000 (07:53 -0000)]
coff_objfmt.c: Add support for ADDR32NB relocations, and enable by default for
the .pdata section. This is needed for structured exception handling on AMD64.
Yasm in the long run should generate this info itself via the use of objfmt
specific directives.
Noticed By: Andrew Dunstan <a_dunstan@hotmail.com>
Peter Johnson [Wed, 29 Jun 2005 06:16:10 +0000 (06:16 -0000)]
Add -M option for Makefile dependency generation.
Initial patch by: Thomas Weidenmueller <thomas@reactsoft.com>
The NASM preprocessor implementation of this is ugly; the preprocessor
really needs a rewrite to clean it up, but there's other higher-priority
items on the TODO list.
Peter Johnson [Fri, 6 May 2005 03:25:34 +0000 (03:25 -0000)]
Fix #52 by updating flat and DJGPP Makefiles to match changes to how
nasm-macros.c is built. Now they build genmacro and generate nasm-macros.c
at build time, as it's no longer contained in the distribution.
Peter Johnson [Mon, 2 May 2005 00:49:55 +0000 (00:49 -0000)]
Add SSE3 (PNI) instruction support.
* x86id.re (yasm_x86__parse_cpu): Add cases for "PRESCOTT", "SSE3", and "PNI".
(yasm_x86__parse_check_id): Add cases for all 13 new instructions.
Update FILD and FISTP so that common fildstp_insn can be used.
(lddqu_insn): New instruction format.
* x86arch.h (CPU_SSE3): New. Renumber others.
* sse3.asm, sse3.hex, sse3.errwarn: New test case for SSE3 instructions.
* x86/tests/Makefile.inc: Include test in build.
Michael Urman [Wed, 16 Mar 2005 05:26:35 +0000 (05:26 -0000)]
Modify the output for 'make check' to be much less verbose, and thus
much easier to see the bad news when necessary. Thanks go to Peter for
updates to the C tests. Kudos to him having us send most of our tests
through a single shell script!
Michael Urman [Sat, 12 Mar 2005 05:06:50 +0000 (05:06 -0000)]
Add `hidden' `internal' and `protected' symbol visibility types to
global symbols in ELF. Search for STV_HIDDEN for explanations; these
don't seem to appear in the base ELF documentation.
Sample syntax:
global foo:hidden
Inspiration and base patch provided by Oskari Saarenmaa under our BSD
license. This checkin tweaks and extends Oskari's patch and adds tests.
Peter Johnson [Sat, 29 Jan 2005 10:24:23 +0000 (10:24 -0000)]
* coff-objfmt.c (win32_objfmt_directive): New function that implements the
undocumented (in NASM) win32 object format "export" directive.
(yasm_win32_LTX_objfmt): Reference above instead of coff_objfmt_directive.
(coff_objfmt_section_switch): Add support for ".drectve" section.
(coff_objfmt_init_new_section): Refactored from coff_objfmt_section_switch.
* preproc.h (yasm_preproc_module): Add define_builtin for defining macros
before standard.mac macros are processed.
(yasm_preproc_builtin_define): Add prototype and macro to call above.
* raw-preproc.c (raw_preproc_define_builtin): Add (empty).
(yasm_raw_LTX_preproc): Use.
* nasm-preproc.c (nasm_preproc_define_builtin): Add wrapper around new
pp_builtin_define.
(yasm_nasm_LTX_preproc): Use.
* nasm-pp.h (pp_builtin_define): Add prototype.
* nasm-pp.c (builtindef): New list of builtin definitions.
(read_line): Iterate through builtindef.
(pp_builtin_define): Add to builtindef.
* standard.mac: Add wrapper around definition of ORG (only for bin objfmt),
add wrappered EXPORT definition.
* yasm.c (apply_preproc_builtins): Define __YASM_OBJFMT__ to selected objfmt.
(main): Call above in correct places.
* export.asm, export.hex, export.errwarn: New test for use of "export" macro
and directive.
Peter Johnson [Mon, 24 Jan 2005 06:21:16 +0000 (06:21 -0000)]
* nasm-listfmt.c (nasm_listfmt_output_expr): Fix garbage due to non-simple
expressions by outputting a 0 if the expr does not have an intnum equivalent.
This is not a fix: the real fix will need to be changing how listfmts get the
final data bytes for a bytecode. This "fix" only replaces the garbage with
0's, not the correct value (e.g. for relative jumps).
Peter Johnson [Thu, 13 Jan 2005 07:14:48 +0000 (07:14 -0000)]
Change how man pages are built (and where they are built to). Building man
pages should now be more consistent across systems.
* arch/Makefile.inc: Build yasm_arch.7 at top level, and in dist_man_MANS
instead of man_MANS. Include build rule for building using XMLTO if XMLTO
is available.
* yasm/Makefile.inc: Likewise (for yasm.1).
* Makefile.am: Change man_MANS to dist_man_MANS. Remove general rules for
.xml.1 and .xml.7. Add dist_man_MANS to MAINTAINERCLEANFILES. Remove
man_MANS from BUILT_SOURCES, DISTCLEANFILES, and EXTRA_DIST.
Peter Johnson [Wed, 12 Jan 2005 07:53:04 +0000 (07:53 -0000)]
Add some abilities to base symrec so that it can be more effectively used by
object formats without creating duplicate lists of symbols. XDF and COFF
were updated; ELF needs to reorder the symbols on its own, so for now it's
not been updated to use the common implementation.
* hamt.c (HAMTEntry, HAMT, HAMT_destroy)
(HAMT_insert): Change SLIST to STAILQ.
* symrec.c (sym_type): Add SYM_SPECIAL.
(yasm_symtab_define_special): New.
(yasm_symrec_declare): New; includes all functionality from symtab_declare.
(yasm_symtab_declare): Call yasm_symrec_declare now.
(yasm_symrec_is_special): New.
* symrec.h: Add prototypes for above.
* xdf-objfmt.c: Use symrec_data instead of declaring xdf_symtab.
* xdflong.hex, xdfprotect.hex, xdfother.hex: Update due to symbol reordering.
* coff-objfmt.c: Use symrec_data instead of declaring coff_symtab.
* elftimes.hex, elfso.hex, elfabssect.hex: Update due to symbol reordering.
* elfglobext.hex, elf-x86id.hex, elftest.hex, elfso64.hex: Likewise.
* stabs-elf.hex: Likewise.
Peter Johnson [Fri, 3 Dec 2004 06:09:30 +0000 (06:09 -0000)]
Fix free-before-use case in x86 finalize code. Bytecode transformation
deletes the old bytecode, so it's not safe to use anything from the old
bytecode after this point (such as the prefixes array passed to arch
finalize).
* x86bc.c (yasm_x86__bc_apply_prefixes): Take x86_common as parameter
rather than bytecode; add line parameter instead of referencing bc->line.
* x86arch.h (yasm_x86__bc_apply_prefixes): Likewise.
* x86id.re (x86_finalize_jmpfar, x86_finalize_jmp)
(yasm_x86__finalize_insn): Apply prefixes before bytecode transform.
Peter Johnson [Thu, 2 Dec 2004 04:05:20 +0000 (04:05 -0000)]
* Makefile.inc: Remove nasm-macros.c from SOURCES; having it there was
causing it to be built as a standalone file (it's not; it's #included into
one of the other source files).
Peter Johnson [Wed, 1 Dec 2004 07:49:18 +0000 (07:49 -0000)]
Greatly simplify build system by removing libtool and integrating formerly
dynamically loaded modules into the now-static libyasm. I now anticipate
that there would be very few users of the dynamic loading features, and it
yielded a lot of instability and build headaches for very little benefit.
The new build should now be much more cross-platform and faster (there was
a lot of overhead in finding and loading modules).
* libtool.m4, ltdl.m4: Delete.
* m4/Makefile.am: Rename to m4/Makefile.inc and remove references to above.
Change to use subdirectory (flat) build rather than recursive build.
* Makefile.am: Include m4/Makefile.inc rather than having it in SUBDIRS.
* libltdl: Delete.
* frontends/yasm/yasm-module.c: Delete.
* basename.c, dirname.c: Delete (no longer needed by yasm-module.c).
* genmodule.c, module.in: Generator and template for new module.c included
in libyasm that replaces the old yasm-module.c (module.in is a modified
rename of yasm-module.c).
* module.h: Modified rename of old yasm-module.h.
* libyasm.h: Include libyasm/module.h.
* libyasm/Makefile.inc: Build generator and include module.c in libyasm.
* yasm.c: Use new libyasm module interface.
* (many) Makefile.inc: Remove libtool libraries, build all modules into
libyasm library.
Peter Johnson [Thu, 18 Nov 2004 06:17:35 +0000 (06:17 -0000)]
Refactor some the x86 bytecode handling now that we parse the entire file
before finalizing instructions.
* x86arch.h (yasm_x86__bc_apply_prefixes): Don't take num_segregs and
prefixes parameters.
* x86bc.c (yasm_x86__bc_apply_prefixes): Move segreg code to...
* x86id.re (yasm_x86__finalize_insn): Here (only user of this code).
(x86_finalize_jmp): Don't pass num_segregs and prefixes.
* x86arch.h (x86_common): New; refactored common bytecode parameters.
(x86_opcode): New; refactored opcode parameters.
(x86_insn): Refactor with x86_common and x86_opcode.
(x86_jmp): Likewise.
* x86id.re (x86_finalize_common, x86_finalize_opcode): New.
(yasm_x86__finalize_insn, x86_finalize_jmp): Use and update substruct refs.
* x86bc.c (x86_common_print, x86_opcode_print): New.
(x86_bc_insn_print, x86_bc_jmp_print): Use and update substruct refs.
(x86_common_resolve): New.
(x86_bc_insn_resolve, x86_bc_jmp_resolve): Use and update substruct refs.
(x86_common_tobytes, x86_opcode_tobytes): New.
(x86_bc_insn_tobytes, x86_bc_jmp_tobytes): Use and update substruct refs.
(yasm_x86__bc_apply_prefixes): Utilize refactor to simplify.
* bytecode.c (bc_insn_finalize): Simplify (or at least level) immediates
and memory operands before passing them off to yasm_arch_finalize_insn().
This may result in some minor performance improvement on complex static
expressions.
* x86arch.h (x86_parse_targetmod): Add X86_FAR_SEGOFF; this is only
generated due to a SEG:OFF immediate being detected during finalize.
(x86_jmp_opcode_sel): Remove JMP_FAR; this is now a separate bytecode.
(x86_jmp): Remove far opcode.
(x86_jmpfar): New bytecode for far jumps.
(yasm_x86__bc_transform_jmpfar): New.
* x86bc.c (x86_bc_callback_jmpfar): New.
(yasm_x86__bc_transform_jmpfar, x86_bc_jmpfar_destroy): New.
(x86_bc_jmp_print): Move far jump code to..
(x86_bc_jmpfar_print): Here (new).
(x86_bc_jmp_resolve, x86_bc_jmpfar_resolve): Likewise (latter new).
(x86_bc_jmp_tobytes, x86_bc_jmpfar_tobytes): Likewise (latter new).
* x86id.re (OPAP_JmpFar): Remove (detected immediately now).
(jmp_insn, call_insn): Update.
(x86_finalize_jmpfar): New.
(x86_finalize_jmp): Remove far jump-related code.
(yasm_x86__finalize_insn): Add check for SEG:OFF immediate operand, and
apply X86_FAR_SEGOFF if necessary. Match OPTM_Far against both X86_FAR
and X86_FAR_SEGOFF. Add shortcut to x86_finalize_jmpfar().
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