Why does my assembly program gives segfault?

I have the following piece of code that I have to debug:

global _start
_start:
pop esp
js 0x36
xor [eax+edi*2+0x43],ebx
xor [eax+edi*2+0x35],bl
xor [eax+edi*2+0x36],bl
cmp [eax+edi*2+0x37],bl
ss pop esp
js 0x49
aaa
pop esp
js 0x52
xor al,0x5c
js 0x56
xor al,0x5c
js 0x59
cmp [eax+edi*2+0x37],bl
xor ebx,[eax+edi*2+0x32]

After compiling and running that code I obtain a segmentation fault error, it seems that something goes wrong after the 5th line. My linux asm knowledge is very basic, any hints or ideas about what is exactly going wrong and how to fix it?