Hi,
I got this problem, can anybody help me please? [I hope this is the
right mailing list for these kind of questions, if not, please forgive me]
I am developing a system level code, where i cannot use libc
directly. So, i wanted to write an assembly file, crt0-ia32.S, which
passes control to main function. I have converted it into a library
archive file using ar & ranlib. But the linker complaints that it
cannot find _start symbol (even though nm reports that symbol). If i
try linking directly with crt0-ia32.o file, it works, but not when i
linked through library. Is there anyway that i can link crt0 through a
library archive?
Thanks in advance,
BVK Chaitanya.
Here are my source files and the compilation procedure i am following:
crt0-ia32.S
===========
.text
.global _start
.global _stext
_stext:
_start:
leal __stack, %esp
pushl %ebx /* mbi ptr */
pushl %eax /* mb magic */
pushl $___return_from_main
jmp main /* call main() */
___return_from_main:
int $3
jmp 1f
.ascii "System stopped."
1: jmp ___return_from_main
.bss
.space 4096
__stack:
main.c
======
int main (int magic, void *mbi)
{
...
return 0;
}
PROCEDURE
=========
gcc -c -nostdinc crt0-ia32.S -o crt0-ia32.o
ar rcs libcrt0.a crt0-ia32.o
ranlib libcrt0.a
gcc -c -nostdinc main.c -o main.o
ld -e_start -N -L. -nostdlib -Ttext=300000 main.o -lcrt0
ld: warning: cannot find entry symbol _start; defaulting to 0000000000300000
--
The question is, how far down the rabbit hole do you want to go?
