initial commitHEADmaster

1 files changed, 96 insertions, 0 deletions

diff --git a/elf-layout.py b/elf-layout.py
new file mode 100644
index 0000000..ee8530b
--- /dev/null
+++ b/elf-layout.py
@@ -0,0 +1,96 @@
+import sys
+
+if len(sys.argv) < 2:
+    print("First arg should be name of the binary")
+    exit()
+
+with open(sys.argv[1], "rb") as f:
+    data = f.read()
+
+def toi(val):
+    res = 0
+    shift = 0
+    for i in val:
+        res += i << shift
+        shift += 8
+    return res
+
+
+def field(offset, size):
+    return data[offset:offset + size]
+
+magic = field(0x00, 4)
+plat_bit = field(0x04, 1)
+endian = field(0x05, 1)
+ver = field(0x06, 1)
+abi = field(0x07, 1)
+abi_ver = field(0x08, 1)
+padding = field(0x09, 7)
+obj_t = field(0x10, 2)
+isa = field(0x12, 2)
+orig_ver = field(0x14, 4)
+
+bit32 = toi(plat_bit) == 1
+bit64 = toi(plat_bit) == 2
+
+# expect 64-bit
+entry = field(0x18, 8)
+phoff = field(0x20, 8)
+shoff = field(0x28, 8)
+flags = field(0x30, 4)
+ehsize = field(0x34, 2)
+
+phentsize = field(0x36, 2)
+phnum = field(0x38, 2)
+
+shentsize = field(0x3a, 2)
+shnum = field(0x3c, 2)
+shstrndx = field(0x3e, 2)
+
+print(data[0x3e])
+print(list(shstrndx))
+shstrndx = toi(shstrndx)
+shnum = toi(shnum)
+shoff = toi(shoff)
+
+strshtab_off = 0
+
+for i in range(shnum):
+    sh_name      = toi(field(shoff + 0x40 * i + 0x00, 4))
+    sh_type      = toi(field(shoff + 0x40 * i + 0x04, 4))
+    sh_flags     = toi(field(shoff + 0x40 * i + 0x08, 8))
+    sh_addr      = toi(field(shoff + 0x40 * i + 0x10, 8))
+    sh_offset    = toi(field(shoff + 0x40 * i + 0x18, 8))
+    sh_size      = toi(field(shoff + 0x40 * i + 0x20, 8))
+    sh_link      = toi(field(shoff + 0x40 * i + 0x28, 4))
+    sh_info      = toi(field(shoff + 0x40 * i + 0x2c, 4))
+    sh_addralign = toi(field(shoff + 0x40 * i + 0x30, 8))
+    sh_entsize   = toi(field(shoff + 0x40 * i + 0x38, 8))
+
+    if i == shstrndx:
+        strshtab_off = sh_offset
+        break
+
+for i in range(shnum):
+    sh_name      = toi(field(shoff + 0x40 * i + 0x00, 4))
+    sh_type      = toi(field(shoff + 0x40 * i + 0x04, 4))
+    sh_flags     = toi(field(shoff + 0x40 * i + 0x08, 8))
+    sh_addr      = toi(field(shoff + 0x40 * i + 0x10, 8))
+    sh_offset    = toi(field(shoff + 0x40 * i + 0x18, 8))
+    sh_size      = toi(field(shoff + 0x40 * i + 0x20, 8))
+    sh_link      = toi(field(shoff + 0x40 * i + 0x28, 4))
+    sh_info      = toi(field(shoff + 0x40 * i + 0x2c, 4))
+    sh_addralign = toi(field(shoff + 0x40 * i + 0x30, 8))
+    sh_entsize   = toi(field(shoff + 0x40 * i + 0x38, 8))
+
+    if sh_type == 0:
+        continue
+    #  print(sh_name)
+    name = []
+    name_idx = strshtab_off + sh_name
+    while data[name_idx] != 0:
+        name.append(data[name_idx])
+        name_idx += 1
+    name = bytes(name).decode()
+    #  print(name)
+