Add a python helper for exploit development

assembler.py

+#!/usr/bin/env python3
+
+import os
+import sys
+import subprocess
+
+arch_prefix = "riscv64-unknown-elf-"
+march = "rv32i"
+reverse_bytes = True
+
+try:
+    path = os.environ["RV_BIN_PATH"]
+except:
+    print("ERROR:")
+    print("You need to set the RV_BIN_PATH environment variable to the path of the risc-v binutils")
+    exit()
+
+assembler = path + "/" + arch_prefix + "as"
+objdump = path + "/" + arch_prefix + "objdump"
+
+subprocess.run([assembler, sys.argv[1], "-march=" + march])
+objdump_result = subprocess.run([objdump, "-D", "a.out"], capture_output=True)
+
+text_start = False
+for line in objdump_result.stdout.decode("utf-8").splitlines():
+    if not text_start:
+        if line == "00000000 <.text>:":
+            text_start = True
+    elif line == "":
+        break
+    else:
+        components = line.split()
+        offset = components[0]
+        hexval = [components[1][0:2], components[1][2:4], components[1][4:6], components[1][6:8]]
+        if reverse_bytes:
+            hexval.reverse()
+        instruction = " ".join(components[2:])
+        print('          "\\x%s\\x%s\\x%s\\x%s" // %s %s' % (hexval[0], hexval[1], hexval[2], hexval[3], offset, instruction))
+
+subprocess.run(["rm", "a.out"])