Following two \"C\" files are given -//File 1, named \"lab5 _ prob5 _ main.c\" v

Question

Following two "C" files are given -//File 1, named "lab5 _ prob5 _ main.c" void print _ hello(); int main(int argc, char *argv[]) {print _ hello(); return 0;}//File 2, named "lab5 _ prob5 _ print.c" #include void print_hello() {printf ("Hello, world ");}; Generate assembly codes for these two files. Then using these assembly files generate the object code files, then link the generated object files to make a single executable file. Use gcc toolset. Provide printout (or copy paste) of the assembly files.

Explanation / Answer

Generate assembly code for these two files:

use following to generate assembly code

$ gcc -S lab5_prob5_main.c lab5_prob5_print.c

$ cat lab5_prob5_main.s

   .file   "lab5_prob5_main.c"
   .text
   .globl   main
   .type   main, @function
main:
.LFB0:
   .cfi_startproc
   pushq   %rbp
   .cfi_def_cfa_offset 16
   .cfi_offset 6, -16
   movq   %rsp, %rbp
   .cfi_def_cfa_register 6
   subq   $16, %rsp
   movl   %edi, -4(%rbp)
   movq   %rsi, -16(%rbp)
   movl   $0, %eax
   call   print_hello
   movl   $0, %eax
   leave
   .cfi_def_cfa 7, 8
   ret
   .cfi_endproc
.LFE0:
   .size   main, .-main
   .ident   "GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-11)"
   .section   .note.GNU-stack,"",@progbits

$ cat lab5_prob5_print.s

   .file   "lab5_prob5_print.c"
   .section   .rodata
.LC0:
   .string   "Hello, world"
   .text
   .globl   print_hello
   .type   print_hello, @function
print_hello:
.LFB0:
   .cfi_startproc
   pushq   %rbp
   .cfi_def_cfa_offset 16
   .cfi_offset 6, -16
   movq   %rsp, %rbp
   .cfi_def_cfa_register 6
   movl   $.LC0, %edi
   call   puts
   popq   %rbp
   .cfi_def_cfa 7, 8
   ret
   .cfi_endproc
.LFE0:
   .size   print_hello, .-print_hello
   .ident   "GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-11)"
   .section   .note.GNU-stack,"",@progbits

Using assembly file generate the object code files:

$ gcc -c lab5_prob5_main.s lab5_prob5_print.s

Thi will generate lab5_prob5_print.o lab5_prob5_main.o

Link the generated object files to make a single executable files

$ gcc -o lab5 lab5_prob5_main.o lab5_prob5_print.o

This will generate a executable named lab5.

Please rate positively if this solved your problem. Comment if you have anydoubt.

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---