I want to compile and execute a very simple program in 64 bit.
section .text
global _start
_start:
mov rdx,len
mov rcx,msg
mov rbx,1
mov rax,4
int 0x80
mov rbx,0
mov rax,1
int 0x80
section .data
msg db "Hello, world!",0xa
len equ $ - msg
The line to compile it:
yasm -f elf64 -g dwarf2 example.asm
$ yasm --version
yasm 1.2.0
also tried with another format macho[|32|64], elf[|32] bin
none of them succeed.
The line to link it:
gcc -o example example.o
ld: warning: ignoring file example.o, file was built for unsupported file format ( 0x7f 0x45 0x4c 0x46 0x 2 0x 1 0x 1 0x 0 0x 0 0x 0 0x 0 0x 0 0x 0 0x 0 0x 0 0x 0 ) which is not the architecture being linked (x86_64): example.o
Undefined symbols for architecture x86_64:
"_main", referenced from:
start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
$ gcc --version
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
also tried with some options for gcc
such as -m64 -arch x86_64
.