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#! /usr/bin/env python
from pdb import pm
from elfesteem.strpatchwork import StrPatchwork
from miasm2.core import asmbloc
from miasm2.core.cpu import parse_ast
from miasm2.arch.arm.arch import mn_arm, base_expr
from miasm2.core import parse_asm
import miasm2.expression.expression as m2_expr
reg_and_id = dict(mn_arm.regs.all_regs_ids_byname)
def my_ast_int2expr(a):
return m2_expr.ExprInt32(a)
def my_ast_id2expr(t):
return reg_and_id.get(t, m2_expr.ExprId(t, size=32))
my_var_parser = parse_ast(my_ast_id2expr, my_ast_int2expr)
base_expr.setParseAction(my_var_parser)
st = StrPatchwork()
blocs, symbol_pool = parse_asm.parse_txt(mn_arm, 'l', '''
main:
MOV R1, R0
MOV R2, 0x100
LDR R3, [PC, mykey1-$]
loop:
ADD R2, R1, R2
ADD R1, R1, 1
LDR R3, [PC, mykey2-$]
CMP R1, R3
BEQ loop
ADD R0, R1, R2
BX LR
mykey1:
.long 0x1
mykey2:
.long 0x2
''')
# fix shellcode addr
symbol_pool.set_offset(symbol_pool.getby_name("main"), 0)
for b in blocs[0]:
print b
resolved_b, patches = asmbloc.asm_resolve_final(
mn_arm, blocs[0], symbol_pool)
print patches
for offset, raw in patches.items():
st[offset] = raw
open('arm_sc.bin', 'wb').write(str(st))
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