Hi,
i am presently working on C but there are some situations i need to know the assembly code of corresponding C program.
if any can provide some general info of c - assembly it would be appreciated.
i have a program called
int main()
{
printf("Hello,Plz Help\n");
return 0;
}if i run this program on Gcc compiler with -S option i could see some assembly instructions.
this is what it is generating . but i am unable to understand
it.below are few questions.
.file "assm-c.c"
.section .rodata
.LC0:
.string "Hello, Plz help\n"
.text
.globl main
.type main,@function
main:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
andl $-16, %esp
movl $0, %eax
subl %eax, %esp
subl $12, %esp
pushl $.LC0
call printf
addl $16, %esp
movl $0, %eax
leave
ret
.Lfe1:
.size main,.Lfe1-main
.ident "GCC: (GNU) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)"what is .rodata
what is .LC0
and what is the procedure that is written in main:
it may be internal processor dependent what it is generating here.
but i want to know what are the general things that are done when converting to assembly.
i have some idea with fucntions
when ever a function is called .
1.push the arguments from right to left into the stack ( meaning allocate memory on stack)
2.push the return address of the function(caller's address)
3.push the base address of functions(caller' s again)
4. allocate memory for the locals.
and when the function returns clering the contents from the stack(dont have idea what does this mean)
is the above procedure correct or do i need to make any changes.
requesting you to guide me in correcting my mistakes and furthur updations.
