change usage for elf

docs/source/elf.rst

@@ -3,12 +3,37 @@ class Elf
 
 Used to get some constant value from the binary::
 
-    2.2.0 :001 > require 'rubypwn'
+    2.2.2 :001 > require 'pp'
+    2.2.2 :001 > require 'rubypwn'
      => true
-    2.2.0 :002 > e = Elf.new "/lib/i386-linux-gnu/libc.so.6"
-    2.2.0 :003 > e.gotplt.keys
-     => ["_Unwind_Find_FDE", "realloc", "malloc", "memalign", "_dl_find_dso_for_object", "calloc", "___tls_get_addr", "free", ""]
-    2.2.0 :004 > e.gotplt["malloc"]
-     => 1744916
-    2.2.0 :005 > puts "%08x" % e.gotplt["malloc"]
-    001aa014
+    2.2.2 :002 > e = Elf.new "traveller"
+    2.2.2 :003 > pp Elf.new "traveller"
+    #<Elf:0x007fdd23c3b510
+     @arch="x86",
+     @bits=32,
+     @dynamic=
+      {"strtab"=>134513496,
+       "symtab"=>134513160,
+       "rel_type"=>"REL",
+       "jmprel"=>134513844},
+     @global={"__gmon_start__"=>{"offset"=>134521192, "value"=>0}},
+     @got=
+      {"__errno_location"=>134521208,
+       "sigemptyset"=>134521212,
+       "getpid"=>134521216,
+       "__gmon_start__"=>134521220,
+       "__isoc99_sscanf"=>134521224,
+       "fgets"=>134521228,
+       "__libc_start_main"=>134521232,
+       "sigaltstack"=>134521236,
+       "siglongjmp"=>134521240,
+       "sigaction"=>134521244,
+       "strlen"=>134521248,
+       "printf"=>134521252,
+       "setvbuf"=>134521256,
+       "puts"=>134521260,
+       "kill"=>134521264,
+       "__sigsetjmp"=>134521268,
+       "exit"=>134521272}>
+    2.2.2 :007 > puts "%08x" % e.got['kill']
+    0804a1b0