Here is something I finally for working. I hope it might be of some help to someone else out there.
Calling libc functions, _puts and _printf, and the syscall function syswrite from OS X with x84-64 bit code.
I used nasm 2.07 and gcc 4.2.1
Next stop, calling Carbon for UI control. Oh yes !
Colin
;nasm -f macho64 hello_3.asm
;gcc -m64 -mmacosx-version-min=10.4 -isysroot /Developer/SDKs/MacOSX10.4u.sdk -o hello_3 hello_3.o
;gcc -m64 -mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk -o hello_3 hello_3.o
SECTION .data
hello db 'syscall: hello, world', 10,0
hellolen equ $ - hello
hello2 db 'puts: hello, world', 10,0
hellolen2 equ $ - hello2
hello3 db 'printf: hello, world %d', 10,0
hellolen3 equ $ - hello3
SECTION .text
GLOBAL _main
extern _printf, _puts
align 4, db 0x90
_main:
push qword rbp ; build stack frame
mov rbp, rsp
; lea rdi, [hello3 wrt rip] ; lea works with yasm but not nasm
mov rdi, qword hello3 ; pointer to string to be displayed
xor eax, eax ; there are 0 float values being passed
mov rsi, 42 ; rsi is the first variable to display. Just giving it a number
call _printf
;puts test
; lea rdi, [hello2 wrt rip] ; lea works with yasm but not nasm
mov rdi, qword hello2 ; string to be displayed
call _puts
; syscall write to device test
mov rax, 0x2000004 ; sys_write
mov rdi, 1 ; stdout
mov rsi, qword hello ; string
mov rdx, hellolen ; length
syscall
xor eax,eax ; set return value to 0
leave ; unwind our stack frame
ret
