initial checkin from subversion

printf1/compile

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+nasm -f elf -l printf1.lst  printf1.asm
+gcc -o printf1 printf1.o

printf1/printf1.asm

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+; printf1.asm   print an integer from storage and from a register
+; Assemble:	nasm -f elf -l printf.lst  printf1.asm
+; Link:		gcc -o printf1  printf1.o
+; Run:		printf1
+; Output:	a=5, eax=7
+
+; Equivalent C code
+; /* printf1.c  print an int and an expression */
+; #include <stdio.h>
+; int main()
+; {
+;   int a=5;
+;   printf("a=%d, eax=%d\n", a, a+2);
+;   return 0;
+; }
+
+; Declare some external functions
+;
+        extern	printf		; the C function, to be called
+
+        SECTION .data		; Data section, initialized variables
+
+	a:	dd	5		; int a=5;
+fmt:    db "a=%d, eax=%d", 10, 0 ; The printf format, "\n",'0'
+
+
+        SECTION .text                   ; Code section.
+
+        global main		; the standard gcc entry point
+main:				; the program label for the entry point
+        push    ebp		; set up stack frame
+        mov     ebp,esp
+
+	mov	eax, [a]	; put a from store into register
+	add	eax, 2		; a+2
+	push	eax		; value of a+2
+        push    dword [a]	; value of variable a
+        push    dword fmt	; address of ctrl string
+        call    printf		; Call C function
+        add     esp, 12		; pop stack 3 push times 4 bytes
+
+        mov     esp, ebp	; takedown stack frame
+        pop     ebp		; same as "leave" op
+
+	mov	eax,0		;  normal, no error, return value
+	ret			; return
+