system.map檔案可以幫助我們理解核心編譯，它記錄了所有程式碼的執行地址 內容格式為：線性地址 型別 符號

1. 具體內容如下：
   
2. 00100000 A phys_startup_32
   
3. c0100000 T startup_32
   
4. c0100000 A _text              注:表示核心程式碼第一個位元組的地址
   
5. c01000c6 t checkCPUtype
   
6. c0100147 t is486
   
7. c010014e t is386
   
8. c0100199 t L6
   
9. c010019b t check_x87
   
10. c01001c2 t setup_idt
    
11. c01001df t rp_sidt
    
12. c01001ec t ignore_int
    
13. c0100220 t rest_init
    
14. c0100220 T stext
    
15. c0100220 T _stext
    
16. c0100252 t do_pre_smp_initcalls
    
17. c0100257 t run_init_process
    
18. c0100283 t init
    
19. c01003a8 t try_name
    
20. c0100529 T name_to_dev_t
    
21. c0100790 t calibrate_delay_direct
    
22. ...
    
23. c02f95d7 T register_kretprobe
    
24. c02f96cd T unregister_kretprobe
    
25. c02f9760 t .text.lock.kprobes
    
26. c02f97b0 T __kprobes_text_end
    
27. c02f9abe t iret_exc
    
28. c02fa1af A _etext               注:核心程式碼結束的位置，之後為核心初始化的資料
    
29. c02fa1b0 A __start___ex_table
    
30. c02facc0 A __stop___ex_table
    
31. c02fb000 r __func__.12
    
32. c02fb000 A __start_rodata
    
33. c02fb00c r __func__.13
    
34. c02fb020 r __func__.2
    
35. c02fb02c r __func__.3
    
36. c02fb040 R linux_banner
    
37. c02fb0bb r __func__.0
    
38. c02fb0c7 r __func__.1
    
39. c02fb0e0 r __func__.0
    
40. c02fb0ec r __func__.1
    
41. c02fb100 r border
    
42. c02fb160 r cplens
    
43. ...
    
44. c03e1b08 D ip_statistics
    
45. c03e1b10 D tcp_statistics
    
46. c03e1b18 D udp_statistics
    
47. c03e1b20 D icmp_statistics
    
48. c03e1b28 D net_statistics
    
49. c03e1b30 d fn_hash_kmem
    
50. c03e1b34 d fn_alias_kmem
    
51. c03e1b38 d xfrm_dst_cache
    
52. c03e1b3c d secpath_cachep
    
53. c03e1b40 A _edata             注:核心初始化資料結束，之後為未初始化資料
    
54. c03e2000 D init_thread_union
    
55. c03e4000 A __init_begin
    
56. c03e4000 t no_halt
    
57. c03e4000 T _sinittext
    
58. c03e400d t mca_pentium
    
59. c03e401d t no_387
    
60. c03e4033 t check_fpu
    
61. ...
    
62. c043a058 b pfkey_table
    
63. c043a05c b pfkey_table_lock
    
64. c043a05c b pfkey_table_users
    
65. c043a060 b pfkey_socks_nr
    
66. c043a064 b acqseq.4
    
67. c043a068 b acqseq_lock.5
    
68. c043a068 A __bss_stop
    
69. c043a068 A _end              注:核心未初始化資料結束
    
70. c043b000 A pg0
    
71. ffffe400 A __kernel_vsyscall
    
72. ffffe410 A SYSENTER_RETURN
    
73. ffffe420 A __kernel_sigreturn
    
74. ffffe440 A __kernel_rt_sigreturn

符號含義 小寫字母表示區域性; 大寫字母表示全域性(外部).  A  The symbol's value is absolute, and will not be changed by further linking. B  The symbol is in the uninitialized data section (known as BSS). C  The symbol is common. Common symbols are uninitialized data. When linking, multiple common symbols may appear with the same name. If the symbol is defined anywhere, the common symbols are treated as undefined references. For more details on common symbols, see the discussion of -warn-common in Linker options. D  The symbol is in the initialized data section. G  The symbol is in an initialized data section for small objects. Some object file formats permit more efficient access to small data objects, such as a global int variable as opposed to a large global array. I  The symbol is an indirect reference to another symbol. This is a GNU extension to the a.out object file format which is rarely used. N  The symbol is a debugging symbol. R  The symbol is in a read only data section. S  The symbol is in an uninitialized data section for small objects. T  The symbol is in the text (code) section. U  The symbol is undefined. V  The symbol is a weak object. When a weak defined symbol is linked with a normal defined symbol, the normal defined symbol is used with no error. When a weak undefined symbol is linked and the symbol is not defined, the value of the weak symbol becomes zero with no error. W  The symbol is a weak symbol that has not been specifically tagged as a weak object symbol. When a weak defined symbol is linked with a normal defined symbol, the normal defined symbol is used with no error. When a weak undefined symbol is linked and the symbol is not defined, the value of the weak symbol becomes zero with no error. -  The symbol is a stabs symbol in an a.out object file. In this case, the next values printed are the stabs other field, the stabs desc field, and the stab type. Stabs symbols are used to hold debugging information. For more information, see Stabs. ?  The symbol type is unknown, or object file format specific. <script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script> 閱讀(941) | 評論(0) | 轉發(2) | 給主人留下些什麼吧！~~ 評論熱議