I have a following program for NASM (ArchLinux i686)
SECTION .data
LC1: db "library call", 0
SECTION .text
extern exit
extern printf
;global main
;main:
global _start
_start:
push LC1
call printf
push 0
call exit
Which is assembled with command:
nasm -f elf libcall.asm
If to comment two lines with _start and uncomment two lines with main, then assemble and link with the command:
gcc libcall.o -o libcall
Then the program runs OK. But if to assemble the code with _start entry point and link with the command:
ld libcall.o -o libcall -lc
Then after launching the program in bash (via the command ./libcall) the following error message is returned:
bash: ./libcall: No such file or directory
Although the libcall file does exist. objdump shows the following:
[al libcall ]$ objdump -d libcall
libcall: file format elf32-i386
Disassembly of section .plt:
08048190 <printf@plt-0x10>:
8048190: ff 35 78 92 04 08 pushl 0x8049278
8048196: ff 25 7c 92 04 08 jmp *0x804927c
804819c: 00 00 add %al,(%eax)
...
080481a0 <printf@plt>:
80481a0: ff 25 80 92 04 08 jmp *0x8049280
80481a6: 68 00 00 00 00 push $0x0
80481ab: e9 e0 ff ff ff jmp 8048190 <printf@plt-0x10>
080481b0 <exit@plt>:
80481b0: ff 25 84 92 04 08 jmp *0x8049284
80481b6: 68 08 00 00 00 push $0x8
80481bb: e9 d0 ff ff ff jmp 8048190 <printf@plt-0x10>
Disassembly of section .text:
080481c0 <_start>:
80481c0: 68 88 92 04 08 push $0x8049288
80481c5: e8 d6 ff ff ff call 80481a0 <printf@plt>
80481ca: 6a 00 push $0x0
80481cc: e8 df ff ff ff call 80481b0 <exit@plt>
How the NASM assembly code should properly be linked with to libc via ld?
There are some parts of libc/crt that come in object files that you also need to link. Additionally you need to specify some options such as the dynamic loader (aka. interpreter) to use (which is probably the reason for your issue.) Just use gcc to do right thing for you. If you are interested you can run with gcc -v and then you will see the horrible command line it uses to link. You have been warned ;)
PS: you should use the main entry point that you have commented out.