lsb_bin_reverse_start

main 400B20

# GCC dictates how the stack is used. Contract between caller and callee on x86:
#    * after call instruction:
#          o %eip points at first instruction of function
#          o %esp+4 points at first argument
#          o %esp points at return address
#    * after ret instruction:
#          o %eip contains return address
#          o %esp points at arguments pushed by caller
#          o called function may have trashed arguments
#          o %eax contains return value (or trash if function is void)
#          o %ecx, %edx may be trashed
#          o %ebp, %ebx, %esi, %edi must contain contents from time of call
#    * Terminology:
#          o %eax, %ecx, %edx are "caller save" registers
#          o %ebp, %ebx, %esi, %edi are "callee save" registers
push    rbx

# edi/rdi is the number of argument(s)
# esi/rsi is the value of the argment(s) as a string in memory

# Check if number of argument equals 1
cmp     edi, 1

# If no arg, the  jump to function that display (usage %password)
jle     short loc_400B45