initial checkin from subversion

printf2/compile

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+nasm -f elf -l printf2.lst  printf2.asm
+gcc -o printf2 printf2.o

printf2/printf2.asm

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+; printf2.asm  use "C" printf on char, string, int, double
+; 
+; Assemble:	nasm -f elf -l printf2.lst  printf2.asm
+; Link:		gcc -o printf2  printf2.o
+; Run:		printf2
+; Output:	
+;Hello world: a string of length 7 1234567 6789ABCD 5.327000e-30 -1.234568E+302
+; 
+; A similar "C" program
+; #include <stdio.h>
+; int main()
+; {
+;   char   char1='a';         /* sample character */
+;   char   str1[]="string";   /* sample string */
+;   int    int1=1234567;      /* sample integer */
+;   int    hex1=0x6789ABCD;   /* sample hexadecimal */
+;   float  flt1=5.327e-30;    /* sample float */
+;   double flt2=-123.4e300;   /* sample double */
+; 
+;   printf("Hello world: %c %s %d %X %e %E \n", /* format string for printf */
+;          char1, str1, int1, hex1, flt1, flt2);
+;   return 0;
+; }
+
+
+        extern printf                   ; the C function to be called
+
+        SECTION .data                   ; Data section
+
+msg:    db "Hello world: %c %s of length %d %d %X %e %E",10,0
+					; format string for printf
+char1:	db	'a'			; a character 
+str1:	db	"string",0	        ; a C string, "string" needs 0
+len:	equ	$-str1			; len has value, not an address
+inta1:	dd	1234567		        ; integer 1234567
+hex1:	dd	0x6789ABCD	        ; hex constant 
+flt1:	dd	5.327e-30		; 32-bit floating point
+flt2:	dq	-123.456789e300	        ; 64-bit floating point
+
+	SECTION .bss
+		
+flttmp:	resq 1			        ; 64-bit temporary for printing flt1
+	
+        SECTION .text                   ; Code section.
+
+        global	main		        ; "C" main program 
+main:				        ; label, start of main program
+	 
+	fld	dword [flt1]	        ; need to convert 32-bit to 64-bit
+	fstp	qword [flttmp]          ; floating load makes 80-bit,
+	                                ; store as 64-bit
+	                                ; push last argument first
+	push	dword [flt2+4]	        ; 64 bit floating point (bottom)
+	push	dword [flt2]	        ; 64 bit floating point (top)
+	push	dword [flttmp+4]        ; 64 bit floating point (bottom)
+	push	dword [flttmp]	        ; 64 bit floating point (top)
+	push	dword [hex1]	        ; hex constant
+	push	dword [inta1]	        ; integer data pass by value
+	push	dword len	        ; constant pass by value
+	push	dword str1		; "string" pass by reference 
+        push    dword [char1]		; 'a'
+        push    dword msg		; address of format string
+        call    printf			; Call C function
+        add     esp, 40			; pop stack 10*4 bytes
+
+        mov     eax, 0			; exit code, 0=normal
+        ret				; main returns to operating system