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+;This file demonstrates many of the differences between NASM version X and NASM
+;version 0.97
+;
+; changed.asm is copyright (C) 1998 John S. Fine
+;
+; It may be redistributed under the same conditions as NASM as described in
+; Licence file in the NASM archive
+;_________________________________
+;
+; nasm changed.asm -l changed.lst
+;
+; When assembled without any -d switches, it includes examples which:
+; Work correctly in version X
+; and Work incorrectly and/or display warnings in version 0.97
+; and Do not prevent the generation of output in version 0.97
+;
+; Not all the differences can be seen in the .lst file. I suggest that you use
+; "ndisasm changes" to examine the code actually generated.
+;_________________________________
+;
+; nasm changed.asm -l changed.lst -doldmsg
+;
+; When assembled with -doldmsg, it adds examples which:
+; Work correctly in version X
+; and Generate error messages in version 0.97 and do not generate output
+;_________________________________
+;
+; nasm changed.asm -l changed.lst -doldcrash
+;
+; When assembled with -doldcrash, it adds examples which:
+; Work correctly in version X
+; and Cause NASM to crash in version 0.97
+;_________________________________
+;
+; nasm changed.asm -l changed.lst -dnewmsg
+;
+; When assembled with -dnewmsg, it adds examples which:
+; Generate error messages in version X
+; and Generate wrong output without warning or error message in version 0.97
+;-----------------------------------------------------------------------------
+
+; Please note that I have reported the name of the person who made the
+; correction based on very limited information. In several cases, I am sure I
+; will identify the wrong author. Please send me any corrections; I don't
+; intend to insult or exclude anyone.
+
+;-----------------------------------------------------------------------------
+; Bug fixed by Simon in assemble()
+;
+; The following generated "call next" / "call next-1" instead of
+; two copies of "call next"
+;
+ times 2 a16 call next
+next:
+
+;-----------------------------------------------------------------------------
+; Bug fixed by John in parse_line() (and other routines)
+;
+; This used to jmp to prior.1, when it should be here.1
+;
+prior:
+.1:
+here: jmp .1
+.1:
+
+;-----------------------------------------------------------------------------
+; Bug fixed by John in assemble()
+;
+; Strings used in dq and dt were not zero filled correctly
+;
+ dq 'b'
+
+
+;-----------------------------------------------------------------------------
+; Bug fixed by Simon in isn_names[]
+;
+; Was not recognised as an instruction
+;
+ int01 ; Instead of INT1
+
+;-----------------------------------------------------------------------------
+; Bug fixed by Jim Hague in ???
+;
+; Forward references were instruction level rather than per operand
+;
+ shr word [forwardref],1
+forwardref:
+
+;-----------------------------------------------------------------------------
+; Bug fixed by John in preproc.c
+;
+; It used to silently discard id characters appended to a multi-line
+; macro parameter (such as the x in %1x below).
+;
+%macro xxx 1
+%1: nop
+%{1}x: jmp %1x
+%endmacro
+xxx yyy
+
+;-----------------------------------------------------------------------------
+; Bug added by John in preproc.c 0.98-J4, removed by John in 0.98-J5
+;
+; Tested here to make sure it stays removed
+;
+%macro TestElse 1
+%if %1=0
+%elif %1=1
+nop
+%endif
+%endmacro
+TestElse 1
+
+%ifdef oldmsg
+;***************************************************************
+;
+; The following examples will generate error messages in 0.97 and will generate
+; correct output in the new version.
+
+;-----------------------------------------------------------------------------
+; Bug fixed by Simon in isns.dat
+;
+; The optional "near" was not permitted on JMP and CALL
+;
+ jmp near here
+
+;-----------------------------------------------------------------------------
+; Feature added by Simon in stdscan()
+;
+; You can now use the numeric value of strings in %assign
+;
+%assign xxx 'ABCD'
+ dd xxx
+
+;-----------------------------------------------------------------------------
+; Feature added by John in add_vectors()
+;
+; Stranger address expressions are now supported as long as they resolve to
+; something valid.
+;
+ mov ax, [eax + ebx + ecx - eax]
+
+;-----------------------------------------------------------------------------
+; Bug fixed by Simon in ???
+;
+; The EQU directive affected local labels in a way that was inconsistent
+; between passes
+;
+.local:
+neither equ $
+ jmp .local
+
+;-----------------------------------------------------------------------------
+; Feature added by Jules in parse_line
+;
+; You can override a size specifier
+;
+%define arg1 dword [bp+4]
+ cmp word arg1, 2
+
+;-----------------------------------------------------------------------------
+; Bug fixed by John in preproc.c
+;
+; You could not use a label on the same line with a macro invocation, if the
+; macro definition began with a preprocessor directive.
+;
+ struc mytype
+.long resd 1
+ endstruc
+
+lbl istruc mytype
+ at mytype.long, dd 'ABCD'
+ iend
+
+;-----------------------------------------------------------------------------
+; Warning removed by John in preproc.c
+;
+; In order to allow macros that extend the definition of instructions, I
+; disabled the warning on a multi-line macro referencing itself.
+;
+%endif ;NASM 0.97 doesn't handle %0 etc. inside false %if
+%macro push 1-* ;
+%rep %0 ;
+push %1 ;
+%rotate 1 ;
+%endrep ;
+%endmacro ;
+%ifdef oldmsg ;
+
+ push ax,bx
+
+;-----------------------------------------------------------------------------
+; Warning removed by John in preproc.c
+;
+; To support other types of macros that extend the definition of instructions,
+; I disabled the warning on a multi-line macro called with the wrong number of
+; parameters. PUSH and POP can be extended equally well by either method, but
+; other intruction extensions may need one method or the other, so I made both
+; work.
+;
+; Note that neither of these warnings was really needed, because a later stage
+; of NASM would almost always give an adequate error message if the macro use
+; really was wrong.
+;
+%endif
+%macro pop 2-*
+%rep %0
+pop %1
+%rotate 1
+%endrep
+%endmacro
+%ifdef oldmsg
+
+ pop ax,bx
+%endif
+
+
+%ifdef newmsg ;***************************************************************
+
+;-----------------------------------------------------------------------------
+; Bug fixed by John in parse_line() (and other routines)
+;
+; This invalid code used to assemble without errors
+;
+myself equ myself+1
+ jmp myself
+
+;-----------------------------------------------------------------------------
+; Change made by John in preproc.c
+;
+; In 0.97, an id that appears as a label on a macro invocation was always
+; prepended to the first line of the macro expansion. That caused several
+; bugs, but also could be used in tricks like the arg macro in c16.mac and
+; c32.mac.
+;
+; In version X, an id that appears as a label on a macro invocation will
+; normally be defined as a label for the address at which the macro is
+; invoked, regardless of whether the first line of the macro expansion is
+; something that can take a label. The new token %00 may be used for any
+; of the situations in which the old prepend behavior was doing something
+; tricky but useful. %00 can also be used more than once and in places
+; other than the start of the expansion.
+;
+%endif
+%assign arg_off 0
+
+%imacro arg 0-1 2 ;arg defined the old way
+ equ arg_off
+%assign arg_off %1+arg_off
+%endmacro
+
+%ifdef newmsg
+arg_example arg
+%endif
+
+%imacro arg2 0-1 2 ;arg defined the new way
+%00 equ arg_off
+%assign arg_off %1+arg_off
+%endmacro
+
+%ifdef oldmsg
+arg_example2 arg2
+
+;-----------------------------------------------------------------------------
+; Change made by Jules and John in INSNS.DAT
+;
+; Various instruction in which the size of an immediate is built-in to the
+; instruction set, now allow you to redundantly specify that size as long
+; as you specify it correctly
+;
+ AAD byte 5
+ AAM byte 5
+ BT bx, byte 3
+ BTC cx, byte 4
+ BTR dx, byte 5
+ BTS si, byte 6
+ IN eax, byte 0x40
+ INT byte 21h
+ OUT byte 70h, ax
+ RET word 2
+ RETN word 2
+ RETF word 4
+
+; note "ENTER" has not been changed yet.
+
+;-----------------------------------------------------------------------------
+; Enhancement by hpa in insns.dat et al
+;
+; Simplified adding new instructions, and added some missing instructions
+;
+ int03 ; Instead of INT3
+ ud1 ; No documented mnemonic for this one
+ ud2
+ sysenter
+ sysexit
+ syscall
+ sysret
+ fxsave [ebx]
+ fxrstor [es:ebx+esi*4+0x3000]
+
+;-----------------------------------------------------------------------------
+; Enhancement by hpa in insns.dat et al
+;
+; Actually make SSE work, and use the -p option to ndisasm to select
+; one of several aliased opcodes
+;
+ sqrtps xmm0,[ebx+10] ; SSE opcode
+ paddsiw mm0,[ebx+10] ; Cyrix opcode with the same byte seq.
+
+;-----------------------------------------------------------------------------
+; Enhancement by hpa in preproc.c
+;
+; Support %undef to remoce a single-line macro
+;
+%define TEST_ME 42
+%ifndef TEST_ME
+%error "TEST_ME not defined after %define"
+%endif
+
+%undef TEST_ME
+%ifdef TEST_ME
+%error "TEST_ME defined after %undef"
+%endif
+
+;-----------------------------------------------------------------------------
+; Bug fix by hpa in insns.dat
+;
+; PSHUFW and PINSRW weren't handling the implicit sizes correctly; all of
+; the entries below are (or should be) legal
+;
+ pshufw mm2, mm1, 3
+ pshufw mm3,[ebx],2
+ pshufw mm7,[0+edi*8],1
+
+ pshufw mm2, mm1, byte 3
+ pshufw mm3,[ebx],byte 2
+ pshufw mm7,[0+edi*8],byte 1
+
+ pshufw mm2, mm1, 3
+ pshufw mm3, qword [ebx], 2
+ pshufw mm7, qword [0+edi*8], 1
+
+ pshufw mm2, mm1, byte 3
+ pshufw mm3, qword [ebx], byte 2
+ pshufw mm7, qword [0+edi*8], byte 1
+
+ pinsrw mm1, [esi], 1
+ pinsrw mm1, word [esi], 1
+ pinsrw mm1, [esi], byte 1
+ pinsrw mm1, word [esi], byte 1
+
+
+%endif ; oldmsg
+
+%ifdef oldcrash ;*************************************************************
+
+This_label_is_256_characters_long__There_used_to_be_a_bug_in_stdscan_which_made_it_crash_when_it_did_a_keyword_search_on_any_label_longer_than_255_characters__Now_anything_longer_than_MAX_KEYWORD_is_always_a_symbol__It_will_not_even_try_a_keyword_search___
+
+;-----------------------------------------------------------------------------
+; Bug fixed by John in preproc.c
+;
+; Builds of NASM that prohibit dereferencing a NULL pointer used to crash if a
+; macro that started with a blank line was invoked with a label
+;
+%macro empty_macro 0
+
+%endm
+
+emlabel empty_macro
+ jmp emlabel
+
+;-----------------------------------------------------------------------------
+; Enhancement by Conan Brink in preproc.c
+;
+; Allow %rep to be nested
+;
+%rep 4
+%rep 5
+ nop
+%endrep
+%endrep
+
+%endif