x86 assembly - linking order query

[<sudheer.divakaran@xxxxxxxxx>]

Title: x86 assembly - linking order query

Hi List,
Sorry for the off topic question. I think I have better chance of getting a solution from this list..


I was experimenting with x86 assembly under Linux, I have defined two functions (AsmFn1,AsmFn2) in a file named asm.s and my main function (c function) calls 'AsmFn1' & it calls AsmFn2 before returning.

Everything works fine if I use the c source as the first file while compiling

i.e.,

        gcc -g -o good test.c asm.s

but, if I use the assembly file as the first file while compiling, when I execute the binary, it is giving SEGFAULT while invoking the Assembly function 'AsmFn1'.

i.e.,
        gcc -g -o bad asm.s test.c

        ./bad will give segfault.

Why is it behaving like this? I'm using FC11 (32 bit) & the gcc comes along with it. I'm pasting the source files below..



asm.s
-----
.text

.globl AsmFn1
        .type   AsmFn1, @function
AsmFn1:
        pushl   %ebp
        movl    %esp, %ebp
        call    AsmFn2
        leave
        ret
        .size   AsmFn1, .-AsmFn1


.globl AsmFn2
        .type AsmFn2,@function
AsmFn2:
        pushl %ebp
        movl %esp,%ebp
        leave
        .size AsmFn2,.-AsmFn2


test.c
------
extern void AsmFn1(void);

int main(void)
{
        AsmFn1();
        return 0;
}





TIA,
--
Sudheer

Attachment: Makefile
Description: Makefile

Attachment: asm.s
Description: asm.s

extern void AsmFn1(void);

int main(void)
{
	AsmFn1();
	return 0;
}