通过实例理解 .debug_info section

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本文解析了通过GCC编译器生成的debug_info.c文件的调试信息。详细介绍了.debug_aranges、.debug_info、.debug_abbrev、.debug_line及.debug_str等节内容，并解释了这些调试信息如何映射到源代码中。

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Use the following debug_info.c file:

#include<stdio.h>

void func(int arg)
{
    int i = 0;
    int local = arg +42;
    while (i<local)
    {
        printf("i = %d\n", i++);
    }
}

int main()
{
func(23);
return (0);
}

Compile debug_info.c to debug_info using -g:
$ gcc -g -o debug_info debug_info.c

Show the sections .debug_*:

$ objdump -s debug_info|grep "section .debug_" -A 15
Contents of section .debug_aranges:
0000 2c000000 02000000 00000800 00000000 ,...............
0010 26054000 00000000 57000000 00000000 &.@.....W.......
0020 00000000 00000000 00000000 00000000 ................
Contents of section .debug_info:
0000 d3000000 04000000 00000801 66000000 ............f...
0010 0c590000 00250000 00260540 00000000 .Y...%...&.@....
0020 00570000 00000000 00000000 00020807 .W..............
0030 13000000 0201083d 00000002 02070000 .......=........
0040 00000204 07180000 00020106 3f000000 ............?...
0050 020205c1 00000003 0405696e 74000208 ..........int...
0060 05500000 00020807 cb000000 02010646 .P.............F
0070 00000004 bc000000 01032605 40000000 ..........&.@...
0080 00004200 00000000 0000019c b9000000 ..B.............
0090 05617267 00010357 00000002 915c0669 .arg...W.....\.i
00a0 00010557 00000002 916807b6 00000001 ...W.....h......
00b0 06570000 0002916c 00084b00 0000010d .W.....l..K.....
00c0 57000000 68054000 00000000 15000000 W...h.@.........
00d0 00000000 019c00                      .......
Contents of section .debug_abbrev:
0000 01110125 0e130b03 0e1b0e11 01120710 ...%............
0010 17000002 24000b0b 3e0b030e 00000324 ....$...>......$
0020 000b0b3e 0b030800 00042e01 3f19030e ...>........?...
0030 3a0b3b0b 27191101 12074018 96421901 :.;.'.....@..B..
0040 13000005 05000308 3a0b3b0b 49130218 ........:.;.I...
0050 00000634 0003083a 0b3b0b49 13021800 ...4...:.;.I....
0060 00073400 030e3a0b 3b0b4913 02180000 ..4...:.;.I.....
0070 082e003f 19030e3a 0b3b0b49 13110112 ...?...:.;.I....
0080 07401896 42190000 00                 .@..B....
Contents of section .debug_line:
0000 45000000 02002300 00000101 fb0e0d00 E.....#.........
0010 01010101 00000001 00000100 64656275 ............debu
0020 675f696e 666f2e63 00000000 00000902 g_info.c........
0030 26054000 00000000 15ad7591 30088e86 &.@.......u.0...
0040 3f4b9f59 02020001 01                 ?K.Y.....
Contents of section .debug_str:
0000 73686f72 7420756e 7369676e 65642069 short unsigned i
0010 6e74006c 6f6e6720 756e7369 676e6564 nt.long unsigned
0020 20696e74 002f686f 6d652f61 6c69656e   int./home/alien
0030 74656b2f 74657374 64697231 00756e73 tek/testdir1.uns
0040 69676e65 64206368 6172006d 61696e00 igned char.main.
0050 6c6f6e67 20696e74 00646562 75675f69 long int.debug_i
0060 6e666f2e 6300474e 55204331 3120352e nfo.c.GNU C11 5.
0070 342e3020 32303136 30363039 202d6d74 4.0 20160609 -mt
0080 756e653d 67656e65 72696320 2d6d6172 une=generic -mar
0090 63683d78 38362d36 34202d67 202d6673 ch=x86-64 -g -fs
00a0 7461636b 2d70726f 74656374 6f722d73 tack-protector-s
00b0 74726f6e 67006c6f 63616c00 66756e63 trong.local.func
00c0 0073686f 72742069 6e740073 697a6574 .short int.sizet
00d0 79706500                             ype.

Resolve section .debug_aranges:
0000 2c000000 02000000 00000800 00000000 ,...............
0010 26054000 00000000 57000000 00000000 &.@.....W.......
0020 00000000 00000000 00000000 00000000 ................

(Ref DWARF4 6.1.2 p 107)
2c000000: section length 0x2c, not include length field
0200:     version 2
00000000: debug_info_offset 0
08:       address_size, 8 bytes of an address
00:       segment_size 0
00000000: segment sector 0
26054000 00000000: begining address 400526
57000000 00000000: range 57
00000000 00000000 00000000 00000000: terminate

Resolve section .debug_info:
0000 d3000000 04000000 00000801 66000000 ............f...
0010 0c590000 00250000 00260540 00000000 .Y...%...&.@....
0020 00570000 00000000 00000000 00020807 .W..............

(see DWARF4 7.5.1 p 143)
d3000000: section length 0xd3, not include length field
0400:     version 4
0000 0000: debug_abbrev_offset 0
08:       address size 8 bytes
01:       abbrev No 1

format of abbrev No 1
(see DWARF4 p 154)
Contents of section .debug_abbrev:
0000 01110125 0e130b03 0e1b0e11 01120710
0010 17000002
   01: abbreviation code 1
   11:    DW_TAG_compile_unit (Figure 18, p 151)
   01:    DW_CHILDREN_yes (Figure 19, p154)
   25:    DW_AT_producer,(Figure 20, p155)
      0e: DW_FORM_strp, string (p160)
   13 0b: DW_AT_language; DW_Form_data1, constant
   03 0e: DW_AT_name; DW_FORM_strp, string
   1b 0e: DW_AT_dir; DW_FORM_strp, string
   11 01: DW_AT_low_pc; address
   12 07: DW_AT_high_pc; DW_FORM_data8
   10 17: DW_AT_stmt_list; DW_FORM_sec_offset
   00 00: terminate

so the format of abbrev No 1 include fields:
DW_AT_producer, DW_AT_language, DW_AT_name, DW_AT_dir, DW_AT_low_pc, DW_AT_high_pc, DW_AT_stmt_list

Return to the section .debug_info
66000000: producer, offset 0x66 in section debug_str,
      0060 ........ ..00474e 55204331 3120352e        GNU C11 5.
      0070 342e3020 32303136 30363039 202d6d74 4.0 20160609 -mt
      0080 756e653d 67656e65 72696320 2d6d6172 une=generic -mar
      0090 63683d78 38362d36 34202d67 202d6673 ch=x86-64 -g -fs
      00a0 7461636b 2d70726f 74656374 6f722d73 tack-protector-s
      00b0 74726f6e 6700....                    trong.
0c:      DW_AT_language, 12 (ANSI c99)
59000000: DW_AT_name, offset 0x59 in section debug_str, debug_info.c
      0050 ........ ........ 00646562 75675f69            debug_i
      0060 6e666f2e 6300.... ........ ........ nfo.c
25000000: DW_AT_dir, offset 0x25 in section debug_str, /home/alientek/testdir1
260540 00000000 00: DW_AT_low_pc, 0x400526
570000 00000000 00: DW_AT_high_pc, 0x57
00000000: DW_AT_stmt_list 0

0020 ........ ........ ........ ..020807 .W..............
0030 13000000 0201083d 00000002 02070000 .......=........
02: abbrev No 2
format of abbrev No 2
Contents of section .debug_abbrev:
0010 ......02 24000b0b 3e0b030e 0000....
   02:    abbreviation code 2
   24:    DW_TAG_base_type
   00:    DW_CHILDREN_no
   0b 0b: DW_AT_byte_size; constant
   3e 0b: DW_AT_encoding; constant
   03 0e: DW_AT_name; DW_FORM_strp, string
Return to the section .debug_info
08: DW_AT_byte_size   8
07: DW_AT_encoding    7   (unsigned)
13000000: DW_AT_name, offset 0x13 in section debug_str, long unsigned int
      0010 ....006c 6f6e6720 756e7369 676e6564
      0020 20696e74 00......

Resolve section .debug_line:
see DWARF4 6.2
0000 45000000 02002300 00000101 fb0e0d00 E.....#.........
0010 01010101 00000001 00000100 64656275 ............debu
0020 675f696e 666f2e63 00000000 00000902 g_info.c........
0030 26054000 00000000 15ad7591 30088e86 &.@.......u.0...
0040 3f4b9f59 02020001 01 ?K.Y.....

45000000: section length 0x45, not include length field
0200:     version 2
23000000: header length 0x45, not include length field
01:       mimimum_instruction_length, 1 bytes
01:       default_is_stmt 1
fb:       line_base -5
0e:       line_range 14
0d:       opcode_base 13
00 01010101 00000001 000001: standard_opcode_lengths 0, 1, 1, 1, 1, 0 ,0, 0, 1, 0, 0, 1
00 64656275 675f696e 666f2e63 00: file name, debug_info.c
000000 00: Padding
00 09 02: Extended code 02, DW_LNE_set_address, length 09
26054000 00000000: set address 0x400526

desired line increment =(opcode - opcode_base) % line_range + line_base
operation advance = (opcode - opcode_base) / line_range
line: line number in source file, line += line increment
operation, machine instruction address, operation += operation adv

15: Special opcode 8 (0x15 -0x0d = 8), line increment 3, operation advance 0,
advance Address by 0 to 0x400526 and Line by 3 to 4
ad: Special opcode 160: advance Address by 11 to 0x400531 and Line by 1 to 5
75: Special opcode 104: advance Address by 7 to 0x400538 and Line by 1 to 6
91: Special opcode 132: advance Address by 9 to 0x400541 and Line by 1 to 7
30: Special opcode 35: advance Address by 2 to 0x400543 and Line by 2 to 9
08: Advance PC by constant 17 to 0x400554 (corresponding to Special opcode 255, p120)
8e: Special opcode 129: advance Address by 9 to 0x40055d and Line by -2 to 7
......
0202: DW_LNS_advance_pc 2, Advance PC by 2 to 0x40057d (p119)
000101: Extended code 01, DW_LNE_end_sequence, length 01

void func(int arg)
{
400526:   55                      push   %rbp
400527:   48 89 e5                mov    %rsp,%rbp
40052a:   48 83 ec 20             sub    $0x20,%rsp
40052e:   89 7d ec                mov    %edi,-0x14(%rbp)
    int i = 0; //line 5
400531:   c7 45 f8 00 00 00 00    movl   $0x0,-0x8(%rbp)
    int local = arg +42; // line 6
400538:   8b 45 ec                mov    -0x14(%rbp),%eax
40053b:   83 c0 2a                add    $0x2a,%eax
40053e:   89 45 fc                mov    %eax,-0x4(%rbp)
    while (i<local)       // line 7
400541:   eb 1a                   jmp    40055d <func+0x37>
    {
        printf("i = %d\n", i++);   //line 9
400543:   8b 45 f8                mov    -0x8(%rbp),%eax
400546:   8d 50 01                lea    0x1(%rax),%edx
400549:   89 55 f8                mov    %edx,-0x8(%rbp)
40054c:   89 c6                   mov    %eax,%esi
40054e:   bf 04 06 40 00          mov    $0x400604,%edi
400553:   b8 00 00 00 00          mov    $0x0,%eax
400558:   e8 a3 fe ff ff          callq 400400 <printf@plt>

void func(int arg)
{
    int i = 0;
    int local = arg +42;
    while (i<local)    //line 7
40055d:   8b 45 f8                mov    -0x8(%rbp),%eax
400560:   3b 45 fc                cmp    -0x4(%rbp),%eax
400563:   7c de                   jl     400543 <func+0x1d>
    {
        printf("i = %d\n", i++);
    }
}    //line 11
400565:   90                      nop
400566:   c9                      leaveq
400567:   c3                      retq

0000000000400568 <main>:

int main()
{    //line 14
400568:   55                      push   %rbp
400569:   48 89 e5                mov    %rsp,%rbp
    func(23); //line 15
40056c:   bf 17 00 00 00          mov    $0x17,%edi
400571:   e8 b0 ff ff ff          callq 400526 <func>
    return (0);    //line 16
400576:   b8 00 00 00 00          mov    $0x0,%eax
40057b:   5d                      pop    %rbp
40057c:   c3                      retq
40057d:   0f 1f 00                nopl   (%rax)

$ objdump -g debug_info

debug_info：文件格式 elf64-x86-64

.debug_aranges 节的内容:

长度：                    44
版本：                    2
.debug_info 节中的偏移量: 0x0
指针大小:                 8
节区大小:                 0

    地址               长度
    0000000000400526 0000000000000057
    0000000000000000 0000000000000000

.debug_info 节的内容:

编译单元 @ 偏移 0x0:
   长度：        0xd3 (32-bit)
   版本：        4
   缩写偏移量：    0x0
   指针大小：    8
<0><b>：缩写编号：1 (DW_TAG_compile_unit)
    <c>   DW_AT_producer    : (间接字串，偏移量：0x66)： GNU C11 5.4.0 20160609 -mtune=generic -march=x86-64 -g -fstack-protector-strong
    <10>   DW_AT_language    : 12   (ANSI C99)
    <11>   DW_AT_name        : (间接字串，偏移量：0x59)： debug_info.c
    <15>   DW_AT_comp_dir    : (间接字串，偏移量：0x25)： /home/alientek/testdir1
    <19>   DW_AT_low_pc      : 0x400526
    <21>   DW_AT_high_pc     : 0x57
    <29>   DW_AT_stmt_list   : 0x0
<1><2d>：缩写编号：2 (DW_TAG_base_type)
    <2e>   DW_AT_byte_size   : 8
    <2f>   DW_AT_encoding    : 7   (unsigned)
    <30>   DW_AT_name        : (间接字串，偏移量：0x13)： long unsigned int
<1><34>：缩写编号：2 (DW_TAG_base_type)
    <35>   DW_AT_byte_size   : 1
    <36>   DW_AT_encoding    : 8   (unsigned char)
    <37>   DW_AT_name        : (间接字串，偏移量：0x3d)： unsigned char
<1><3b>：缩写编号：2 (DW_TAG_base_type)
    <3c>   DW_AT_byte_size   : 2
    <3d>   DW_AT_encoding    : 7   (unsigned)
    <3e>   DW_AT_name        : (间接字串，偏移量：0x0)： short unsigned int
<1><42>：缩写编号：2 (DW_TAG_base_type)
    <43>   DW_AT_byte_size   : 4
    <44>   DW_AT_encoding    : 7   (unsigned)
    <45>   DW_AT_name        : (间接字串，偏移量：0x18)： unsigned int
<1><49>：缩写编号：2 (DW_TAG_base_type)
    <4a>   DW_AT_byte_size   : 1
    <4b>   DW_AT_encoding    : 6   (signed char)
    <4c>   DW_AT_name        : (间接字串，偏移量：0x3f)： signed char
<1><50>：缩写编号：2 (DW_TAG_base_type)
    <51>   DW_AT_byte_size   : 2
    <52>   DW_AT_encoding    : 5   (signed)
    <53>   DW_AT_name        : (间接字串，偏移量：0xc1)： short int
<1><57>：缩写编号：3 (DW_TAG_base_type)
    <58>   DW_AT_byte_size   : 4
    <59>   DW_AT_encoding    : 5   (signed)
    <5a>   DW_AT_name        : int
<1><5e>：缩写编号：2 (DW_TAG_base_type)
    <5f>   DW_AT_byte_size   : 8
    <60>   DW_AT_encoding    : 5   (signed)
    <61>   DW_AT_name        : (间接字串，偏移量：0x50)： long int
<1><65>：缩写编号：2 (DW_TAG_base_type)
    <66>   DW_AT_byte_size   : 8
    <67>   DW_AT_encoding    : 7   (unsigned)
    <68>   DW_AT_name        : (间接字串，偏移量：0xcb)： sizetype
<1><6c>：缩写编号：2 (DW_TAG_base_type)
    <6d>   DW_AT_byte_size   : 1
    <6e>   DW_AT_encoding    : 6   (signed char)
    <6f>   DW_AT_name        : (间接字串，偏移量：0x46)： char
<1><73>：缩写编号：4 (DW_TAG_subprogram)
    <74>   DW_AT_external    : 1
    <74>   DW_AT_name        : (间接字串，偏移量：0xbc)： func
    <78>   DW_AT_decl_file   : 1
    <79>   DW_AT_decl_line   : 3
    <7a>   DW_AT_prototyped : 1
    <7a>   DW_AT_low_pc      : 0x400526
    <82>   DW_AT_high_pc     : 0x42
    <8a>   DW_AT_frame_base : 1 字节区块： 9c    (DW_OP_call_frame_cfa)
    <8c>   DW_AT_GNU_all_tail_call_sites: 1
    <8c>   DW_AT_sibling     : <0xb9>
<2><90>：缩写编号：5 (DW_TAG_formal_parameter)
    <91>   DW_AT_name        : arg
    <95>   DW_AT_decl_file   : 1
    <96>   DW_AT_decl_line   : 3
    <97>   DW_AT_type        : <0x57>
    <9b>   DW_AT_location    : 2 字节区块： 91 5c    (DW_OP_fbreg: -36)
<2><9e>：缩写编号：6 (DW_TAG_variable)
    <9f>   DW_AT_name        : i
    <a1>   DW_AT_decl_file   : 1
    <a2>   DW_AT_decl_line   : 5
    <a3>   DW_AT_type        : <0x57>
    <a7>   DW_AT_location    : 2 字节区块： 91 68    (DW_OP_fbreg: -24)
<2><aa>：缩写编号：7 (DW_TAG_variable)
    <ab>   DW_AT_name        : (间接字串，偏移量：0xb6)： local
    <af>   DW_AT_decl_file   : 1
    <b0>   DW_AT_decl_line   : 6
    <b1>   DW_AT_type        : <0x57>
    <b5>   DW_AT_location    : 2 字节区块： 91 6c    (DW_OP_fbreg: -20)
<2><b8>：缩写编号：0
<1><b9>：缩写编号：8 (DW_TAG_subprogram)
    <ba>   DW_AT_external    : 1
    <ba>   DW_AT_name        : (间接字串，偏移量：0x4b)： main
    <be>   DW_AT_decl_file   : 1
    <bf>   DW_AT_decl_line   : 13
    <c0>   DW_AT_type        : <0x57>
    <c4>   DW_AT_low_pc      : 0x400568
    <cc>   DW_AT_high_pc     : 0x15
    <d4>   DW_AT_frame_base : 1 字节区块： 9c    (DW_OP_call_frame_cfa)
    <d6>   DW_AT_GNU_all_tail_call_sites: 1
<1><d6>：缩写编号：0

.debug_abbrev 节的内容:

Number TAG (0x0)
   1      DW_TAG_compile_unit    [has children]
    DW_AT_producer     DW_FORM_strp
    DW_AT_language     DW_FORM_data1
    DW_AT_name         DW_FORM_strp
    DW_AT_comp_dir     DW_FORM_strp
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_high_pc      DW_FORM_data8
    DW_AT_stmt_list    DW_FORM_sec_offset
    DW_AT value: 0     DW_FORM value: 0
   2      DW_TAG_base_type    [no children]
    DW_AT_byte_size    DW_FORM_data1
    DW_AT_encoding     DW_FORM_data1
    DW_AT_name         DW_FORM_strp
    DW_AT value: 0     DW_FORM value: 0
   3      DW_TAG_base_type    [no children]
    DW_AT_byte_size    DW_FORM_data1
    DW_AT_encoding     DW_FORM_data1
    DW_AT_name         DW_FORM_string
    DW_AT value: 0     DW_FORM value: 0
   4      DW_TAG_subprogram    [has children]
    DW_AT_external     DW_FORM_flag_present
    DW_AT_name         DW_FORM_strp
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_prototyped   DW_FORM_flag_present
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_high_pc      DW_FORM_data8
    DW_AT_frame_base   DW_FORM_exprloc
    DW_AT_GNU_all_tail_call_sites DW_FORM_flag_present
    DW_AT_sibling      DW_FORM_ref4
    DW_AT value: 0     DW_FORM value: 0
   5      DW_TAG_formal_parameter    [no children]
    DW_AT_name         DW_FORM_string
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_type         DW_FORM_ref4
    DW_AT_location     DW_FORM_exprloc
    DW_AT value: 0     DW_FORM value: 0
   6      DW_TAG_variable    [no children]
    DW_AT_name         DW_FORM_string
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_type         DW_FORM_ref4
    DW_AT_location     DW_FORM_exprloc
    DW_AT value: 0     DW_FORM value: 0
   7      DW_TAG_variable    [no children]
    DW_AT_name         DW_FORM_strp
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_type         DW_FORM_ref4
    DW_AT_location     DW_FORM_exprloc
    DW_AT value: 0     DW_FORM value: 0
   8      DW_TAG_subprogram    [no children]
    DW_AT_external     DW_FORM_flag_present
    DW_AT_name         DW_FORM_strp
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_type         DW_FORM_ref4
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_high_pc      DW_FORM_data8
    DW_AT_frame_base   DW_FORM_exprloc
    DW_AT_GNU_all_tail_call_sites DW_FORM_flag_present
    DW_AT value: 0     DW_FORM value: 0

.debug_line 节的调试内容转储：

偏移：                       0x0
长度：                      69
DWARF 版本：                2
导言长度：        35
最小指令长度：              1
“is_stmt”的初始值：       1
行基数：                      -5
行范围：                      14
操作码基数：                  13

操作码:
操作码 1 具有 0 个参数
操作码 2 具有 1 个参数
操作码 3 具有 1 个参数
操作码 4 具有 1 个参数
操作码 5 具有 1 个参数
操作码 6 具有 0 个参数
操作码 7 具有 0 个参数
操作码 8 具有 0 个参数
操作码 9 具有 1 个参数
操作码 10 具有 0 个参数
操作码 11 具有 0 个参数
操作码 12 具有 1 个参数

目录表为空。

文件名表 (偏移 0x1c):
条目目录时间大小名称
1 0 0 0 debug_info.c

行号语句：
[0x0000002d] 扩充操作码 2：设置地址为 0x400526
[0x00000038] Special opcode 8: advance Address by 0 to 0x400526 and Line by 3 to 4
[0x00000039] Special opcode 160: advance Address by 11 to 0x400531 and Line by 1 to 5
[0x0000003a] Special opcode 104: advance Address by 7 to 0x400538 and Line by 1 to 6
[0x0000003b] Special opcode 132: advance Address by 9 to 0x400541 and Line by 1 to 7
[0x0000003c] Special opcode 35: advance Address by 2 to 0x400543 and Line by 2 to 9
[0x0000003d] Advance PC by constant 17 to 0x400554
[0x0000003e] Special opcode 129: advance Address by 9 to 0x40055d and Line by -2 to 7
[0x0000003f] Special opcode 121: advance Address by 8 to 0x400565 and Line by 4 to 11
[0x00000040] Special opcode 50: advance Address by 3 to 0x400568 and Line by 3 to 14
[0x00000041] Special opcode 62: advance Address by 4 to 0x40056c and Line by 1 to 15
[0x00000042] Special opcode 146: advance Address by 10 to 0x400576 and Line by 1 to 16
[0x00000043] Special opcode 76: advance Address by 5 to 0x40057b and Line by 1 to 17
[0x00000044] Advance PC by 2 to 0x40057d
[0x00000046] 扩充操作码 1：序列结束

.debug_str 节的内容:

0x00000000 73686f72 7420756e 7369676e 65642069 short unsigned i
0x00000010 6e74006c 6f6e6720 756e7369 676e6564 nt.long unsigned
0x00000020 20696e74 002f686f 6d652f61 6c69656e int./home/alien
0x00000030 74656b2f 74657374 64697231 00756e73 tek/testdir1.uns
0x00000040 69676e65 64206368 6172006d 61696e00 igned char.main.
0x00000050 6c6f6e67 20696e74 00646562 75675f69 long int.debug_i
0x00000060 6e666f2e 6300474e 55204331 3120352e nfo.c.GNU C11 5.
0x00000070 342e3020 32303136 30363039 202d6d74 4.0 20160609 -mt
0x00000080 756e653d 67656e65 72696320 2d6d6172 une=generic -mar
0x00000090 63683d78 38362d36 34202d67 202d6673 ch=x86-64 -g -fs
0x000000a0 7461636b 2d70726f 74656374 6f722d73 tack-protector-s
0x000000b0 74726f6e 67006c6f 63616c00 66756e63 trong.local.func
0x000000c0 0073686f 72742069 6e740073 697a6574 .short int.sizet
0x000000d0 79706500 ype.