OSX系统自带的otool可以分析Mach-O可执行文件
类似命令行工具:jtool
常用命令如下:
- 查看fat headers信息
otool -f xxx.app/xxx
$ otool -f xxx.app/xxx
Fat headers
fat_magic 0xcafebabe
nfat_arch 2
architecture 0
cputype 12
cpusubtype 9
capabilities 0x0
offset 16384
size 69642576
align 2^14 (16384)
architecture 1
cputype 16777228
cpusubtype 0
capabilities 0x0
offset 69664768
size 80306624
align 2^14 (16384)
- 查看archive header信息
otool -a xxx.app/xxx
$ otool -a xxx.app/xxx
- 查看Mach-O头结构
otool -h xxx.app/xxx
$ otool -h xxx.app/xxx
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
0xfeedface 12 9 0x00 2 52 5452 0x00218085
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
0xfeedfacf 16777228 0 0x00 2 52 6128 0x00218085
- 查看load commands
otool -l xxx.app/xxx
$ otool -l xxx.app/xxx
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
0xfeedface 12 9 0x00 2 52 5452 0x00218085
Load command 0
cmd LC_SEGMENT
cmdsize 56
segname __PAGEZERO
vmaddr 0x00000000
vmsize 0x00004000
fileoff 0
filesize 0
maxprot 0x00000000
initprot 0x00000000
nsects 0
flags 0x0
Load command 1
cmd LC_SEGMENT
cmdsize 736
segname __TEXT
vmaddr 0x00004000
vmsize 0x03b44000
fileoff 0
filesize 62144512
maxprot 0x00000005
initprot 0x00000005
nsects 10
flags 0x0
Section
sectname __text
segname __TEXT
addr 0x000092c0
size 0x01f49bcc
offset 21184
align 2^4 (16)
reloff 0
nreloc 0
flags 0x80000400
reserved1 0
reserved2 0
- 查看依赖的动态库,包括动态库名称、当前版本号、兼容版本号
otool -L xxx.app/xxx
$ otool -L xxx.app/xxx
xxx.app/xxx (architecture armv7):
/System/Library/Frameworks/CoreMotion.framework/CoreMotion (compatibility version 1.0.0, current version 2236.0.11)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.0.0)
/System/Library/Frameworks/CoreText.framework/CoreText (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox (compatibility version 1.0.0, current version 492.0.0)
/System/Library/Frameworks/AVFoundation.framework/AVFoundation (compatibility version 1.0.0, current version 2.0.0)
xxx.app/xxx (architecture arm64):
/System/Library/Frameworks/CoreMotion.framework/CoreMotion (compatibility version 1.0.0, current version 2236.0.11)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.0.0)
/System/Library/Frameworks/CoreText.framework/CoreText (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/AudioToolbox.framework/AudioToolbox (compatibility version 1.0.0, current version 492.0.0)
/System/Library/Frameworks/AVFoundation.framework/AVFoundation (compatibility version 1.0.0, current version 2.0.0)
- 查看支持的框架
otool -D xxx.app/xxx
$ otool -D xxx.app/xxx
xxx.app/xxx (architecture armv7):
xxx.app/xxx (architecture arm64):
- 查看text section
otool -t -v xxx.app/xxx
$ otool -t -v xxx.app/xxx
xxx.app/xxx (architecture armv7):
(__TEXT,__text) section
000092c0 f0 b5 push {r4, r5, r6, r7, lr}
000092c2 03 af add r7, sp, #0xc
000092c4 2d e9 00 0d push.w {r8, r10, r11}
000092c8 ad f5 78 6d sub.w sp, sp, #0xf80
000092cc 82 b0 sub sp, #0x8
000092ce 4c f2 2e 20 movw r0, #0xc22e
000092d2 c0 f2 fc 30 movt r0, #0x3fc
000092d6 78 44 add r0, pc
000092d8 d0 f8 00 80 ldr.w r8, [r0]
000092dc 42 f2 b8 20 movw r0, #0x22b8
000092e0 c0 f2 c9 30 movt r0, #0x3c9
000092e4 78 44 add r0, pc
000092e6 41 46 mov r1, r8
000092e8 02 46 mov r2, r0
...
xxx.app/xxx (architecture arm64):
(__TEXT,__text) section
000092c0 f0 b5 push {r4, r5, r6, r7, lr}
000092c2 03 af add r7, sp, #0xc
000092c4 2d e9 00 0d push.w {r8, r10, r11}
000092c8 ad f5 78 6d sub.w sp, sp, #0xf80
000092cc 82 b0 sub sp, #0x8
000092ce 4c f2 2e 20 movw r0, #0xc22e
000092d2 c0 f2 fc 30 movt r0, #0x3fc
000092d6 78 44 add r0, pc
000092d8 d0 f8 00 80 ldr.w r8, [r0]
000092dc 42 f2 b8 20 movw r0, #0x22b8
000092e0 c0 f2 c9 30 movt r0, #0x3c9
000092e4 78 44 add r0, pc
000092e6 41 46 mov r1, r8
000092e8 02 46 mov r2, r0
...
- 查看data section
otool -d xxx.app/xxx
$ otool -d xxx.app/xxx
xxx.app/xxx (architecture armv7):
Contents of (__DATA,__data) section
03fdf2d0 01f94e98 01fef35b 01fef376 00000000
03fdf2e0 037b0c7d 00000000 03fb44bc 00000000
03fdf2f0 03fb45a8 00000000 03fb45bc 00000034
03fdf300 00000000 03fb45e4 00000000 00000000
03fdf310 00000000 037b0c65 03fb4634 00000000
xxx.app/xxx (architecture arm64):
Contents of (__DATA,__data) section
0000000104a01100 02435948 00000001 0248fe0b 00000001
0000000104a01110 0248fe26 00000001 00000000 00000000
0000000104a01120 03c5113a 00000001 00000000 00000000
0000000104a01130 049b2700 00000001 00000000 00000000
0000000104a01140 049b28d0 00000001 00000000 00000000
- 查看Objective-C segment
otool -o xxx.app/xxx
$ otool -o xxx.app/xxx
xxx.app/xxx (architecture armv7):
Contents of (__DATA,__objc_classlist) section
03fb3690 0x3fda424
isa 0x3fda410
superclass 0x0
cache 0x0
vtable 0x0
data 0x3fb4304 (struct class_ro_t *)
flags 0x90
instanceStart 4
instanceSize 4
ivarLayout 0x0
name 0x37b0c31 GICQgdiSTB
baseMethods 0x0 (struct method_list_t *)
baseProtocols 0x0
ivars 0x0
weakIvarLayout 0x0
baseProperties 0x0
Meta Class
isa 0x0
superclass 0x0
cache 0x0
vtable 0x0
data 0x3fb42dc (struct class_ro_t *)
flags 0x91 RO_META
instanceStart 20
instanceSize 20
ivarLayout 0x0
name 0x37b0c31 GICQgdiSTB
baseMethods 0x3fb42c8 (struct method_list_t *)
entsize 12
count 1
name 0x3799743 load
types 0x37b3155 v8@0:4
imp 0x92c1
baseProtocols 0x0
ivars 0x0
weakIvarLayout 0x0
baseProperties 0x0
...
xxx.app/xxx (architecture arm64):
Contents of (__DATA,__objc_classlist) section
00000001049b0b38 0x1049f73a8
isa 0x1049f7380
superclass 0x0 _OBJC_CLASS_$_NSObject
cache 0x0
vtable 0x0
data 0x1049b23f8 (struct class_ro_t *)
flags 0x90
instanceStart 8
instanceSize 8
reserved 0x0
ivarLayout 0x0
name 0x103c510ee GICQgdiSTB
baseMethods 0x0 (struct method_list_t *)
baseProtocols 0x0
ivars 0x0
weakIvarLayout 0x0
baseProperties 0x0
Meta Class
isa 0x0
superclass 0x0 _OBJC_METACLASS_$_NSObject
cache 0x0
vtable 0x0
data 0x1049b23b0 (struct class_ro_t *)
flags 0x91 RO_META
instanceStart 40
instanceSize 40
reserved 0x0
ivarLayout 0x0
name 0x103c510ee GICQgdiSTB
baseMethods 0x1049b2390 (struct method_list_t *)
entsize 24
count 1
name 0x103c39c13 load
types 0x103c535db v16@0:8
imp 0x1000058f0
baseProtocols 0x0
ivars 0x0
weakIvarLayout 0x0
baseProperties 0x0
- 查看symbol table
otool -I xxx.app/xxx
$ otool -I xxx.app/xxx
xxx.app/xxx (architecture armv7):
Indirect symbols for (__TEXT,__picsymbolstub4__TEXT) 815 entries
address index
0x01f52e8c 491
0x01f52e9c 492
0x01f52eac 493
0x01f52ebc 494
0x01f52ecc 495
...
xxx.app/xxx (architecture arm64):
Indirect symbols for (__TEXT,__stubs) 824 entries
address index
0x00000001023f470c 52
0x00000001023f4718 53
0x00000001023f4724 54
0x00000001023f4730 55
0x00000001023f473c 56
...
- 获取所有方法名称:
otool -v -s __TEXT __objc_methname xxx.app/xxx
$ otool -v -s __TEXT __objc_methname xxx.app/xxx
xxx.app/xxx (architecture armv7):
Contents of (__TEXT,__objc_methname) section
0379972a stringByAppendingString:
03799743 load
03799748 stringWithUTF8String:
0379975e user
03799763 setUser:
0379976c password
03799775 setPassword:
...
xxx.app/xxx (architecture arm64):
Contents of (__TEXT,__objc_methname) section
0000000103c39bfa stringByAppendingString:
0000000103c39c13 load
0000000103c39c18 stringWithUTF8String:
0000000103c39c2e user
0000000103c39c33 setUser:
0000000103c39c3c password
0000000103c39c45 setPassword:
...
下面列举一些常见的 Section。
| Section | 用途 |
|---|---|
__TEXT.__text |
主程序代码 |
__TEXT.__cstring |
C 语言字符串 |
__TEXT.__const |
const 关键字修饰的常量 |
__TEXT.__stubs |
用于 Stub 的占位代码，很多地方称之为桩代码。 |
__TEXT.__stubs_helper |
当 Stub 无法找到真正的符号地址后的最终指向 |
__TEXT.__objc_methname |
Objective-C 方法名称 |
__TEXT.__objc_methtype |
Objective-C 方法类型 |
__TEXT.__objc_classname |
Objective-C 类名称 |
__DATA.__data |
初始化过的可变数据 |
__DATA.__la_symbol_ptr |
lazy binding 的指针表，表中的指针一开始都指向 __stub_helper |
__DATA.nl_symbol_ptr |
非 lazy binding 的指针表，每个表项中的指针都指向一个在装载过程中，被动态链机器搜索完成的符号 |
__DATA.__const |
没有初始化过的常量 |
__DATA.__cfstring |
程序中使用的 Core Foundation 字符串（CFStringRefs） |
__DATA.__bss |
BSS，存放为初始化的全局变量，即常说的静态内存分配 |
__DATA.__common |
没有初始化过的符号声明 |
__DATA.__objc_classlist |
Objective-C 类列表 |
__DATA.__objc_protolist |
Objective-C 原型 |
__DATA.__objc_imginfo |
Objective-C 镜像信息 |
__DATA.__objc_selfrefs |
Objective-C self 引用 |
__DATA.__objc_protorefs |
Objective-C 原型引用 |
__DATA.__objc_superrefs |
Objective-C 超类引用 |