;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 nextnext:;-----------------------------------------------------------------------------; 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],1forwardref:;-----------------------------------------------------------------------------; 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%endmacroxxx 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=1nop%endif%endmacroTestElse 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	endstruclbl	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 %0pop %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 newmsgarg_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 oldmsgarg_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%endmemlabel empty_macro	jmp	emlabel;-----------------------------------------------------------------------------; Enhancement by Conan Brink in preproc.c;; Allow %rep to be nested;%rep 4%rep 5	nop%endrep%endrep%endif