gistfile1.txt

#32-bit
> ./xgcc -c -g -save-temps -o t.o t.S && cat t.s && readelf -w t.o
foo: ret
Raw dump of debug contents of section .debug_line:

  Offset:                      0x0
  Length:                      45
  DWARF Version:               2
  Prologue Length:             26
  Minimum Instruction Length:  1
  Initial value of 'is_stmt':  1
  Line Base:                   -5
  Line Range:                  14
  Opcode Base:                 13

 Opcodes:
  Opcode 1 has 0 args
  Opcode 2 has 1 arg
  Opcode 3 has 1 arg
  Opcode 4 has 1 arg
  Opcode 5 has 1 arg
  Opcode 6 has 0 args
  Opcode 7 has 0 args
  Opcode 8 has 0 args
  Opcode 9 has 1 arg
  Opcode 10 has 0 args
  Opcode 11 has 0 args
  Opcode 12 has 1 arg

 The Directory Table is empty.

 The File Name Table (offset 0x1c):
  Entry Dir     Time    Size    Name
  1     0       0       0       t.s

 Line Number Statements:
  [0x00000024]  Extended opcode 2: set Address to 0x0
  [0x0000002b]  Copy
  [0x0000002c]  Advance PC by 1 to 0x1
  [0x0000002e]  Extended opcode 1: End of Sequence


Contents of the .debug_info section:

  Compilation Unit @ offset 0x0:
   Length:        0x22 (32-bit)
   Version:       2
   Abbrev Offset: 0x0
   Pointer Size:  4
 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <c>   DW_AT_stmt_list   : 0x0
    <10>   DW_AT_low_pc      : 0x0
    <14>   DW_AT_high_pc     : 0x1
    <18>   DW_AT_name        : (indirect string, offset: 0x0): t.s
    <1c>   DW_AT_comp_dir    : (indirect string, offset: 0x4): /scratch/alarcher/oi-userland/components/developer/gcc-8/build/i86/gcc
    <20>   DW_AT_producer    : (indirect string, offset: 0x4b): GNU AS 2.30
    <24>   DW_AT_language    : 32769    (MIPS assembler)

Contents of the .debug_abbrev section:

  Number TAG (0x0)
   1      DW_TAG_compile_unit    [no children]
    DW_AT_stmt_list    DW_FORM_data4
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_high_pc      DW_FORM_addr
    DW_AT_name         DW_FORM_strp
    DW_AT_comp_dir     DW_FORM_strp
    DW_AT_producer     DW_FORM_strp
    DW_AT_language     DW_FORM_data2
    DW_AT value: 0     DW_FORM value: 0

Contents of the .debug_aranges section:

  Length:                   28
  Version:                  2
  Offset into .debug_info:  0x0
  Pointer Size:             4
  Segment Size:             0

    Address    Length
    00000000 00000001 
    00000000 00000000 

Contents of the .debug_str section:

  0x00000000 742e7300 2f736372 61746368 2f616c61 t.s./scratch/ala
  0x00000010 72636865 722f6f69 2d757365 726c616e rcher/oi-userlan
  0x00000020 642f636f 6d706f6e 656e7473 2f646576 d/components/dev
  0x00000030 656c6f70 65722f67 63632d38 2f627569 eloper/gcc-8/bui
  0x00000040 6c642f69 38362f67 63630047 4e552041 ld/i86/gcc.GNU A
  0x00000050 5320322e 333000                     S 2.30.
  
#64-bit
> ./xgcc -m64 -c -g -save-temps -o t64.o t.S && cat t.s && readelf -w t64.o
foo: ret
Raw dump of debug contents of section .debug_line:

  Offset:                      0x0
  Length:                      49
  DWARF Version:               2
  Prologue Length:             26
  Minimum Instruction Length:  1
  Initial value of 'is_stmt':  1
  Line Base:                   -5
  Line Range:                  14
  Opcode Base:                 13

 Opcodes:
  Opcode 1 has 0 args
  Opcode 2 has 1 arg
  Opcode 3 has 1 arg
  Opcode 4 has 1 arg
  Opcode 5 has 1 arg
  Opcode 6 has 0 args
  Opcode 7 has 0 args
  Opcode 8 has 0 args
  Opcode 9 has 1 arg
  Opcode 10 has 0 args
  Opcode 11 has 0 args
  Opcode 12 has 1 arg

 The Directory Table is empty.

 The File Name Table (offset 0x1c):
  Entry Dir     Time    Size    Name
  1     0       0       0       t.s

 Line Number Statements:
  [0x00000024]  Extended opcode 2: set Address to 0x0
  [0x0000002f]  Copy
  [0x00000030]  Advance PC by 1 to 0x1
  [0x00000032]  Extended opcode 1: End of Sequence


Contents of the .debug_info section:

  Compilation Unit @ offset 0x0:
   Length:        0x2a (32-bit)
   Version:       2
   Abbrev Offset: 0x0
   Pointer Size:  8
 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <c>   DW_AT_stmt_list   : 0x0
    <10>   DW_AT_low_pc      : 0x0
    <18>   DW_AT_high_pc     : 0x1
    <20>   DW_AT_name        : (indirect string, offset: 0x0): t.s
    <24>   DW_AT_comp_dir    : (indirect string, offset: 0x4): /scratch/alarcher/oi-userland/components/developer/gcc-8/build/i86/gcc
    <28>   DW_AT_producer    : (indirect string, offset: 0x4b): GNU AS 2.30
    <2c>   DW_AT_language    : 32769    (MIPS assembler)

Contents of the .debug_abbrev section:

  Number TAG (0x0)
   1      DW_TAG_compile_unit    [no children]
    DW_AT_stmt_list    DW_FORM_data4
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_high_pc      DW_FORM_addr
    DW_AT_name         DW_FORM_strp
    DW_AT_comp_dir     DW_FORM_strp
    DW_AT_producer     DW_FORM_strp
    DW_AT_language     DW_FORM_data2
    DW_AT value: 0     DW_FORM value: 0

Contents of the .debug_aranges section:

  Length:                   44
  Version:                  2
  Offset into .debug_info:  0x0
  Pointer Size:             8
  Segment Size:             0

    Address            Length
    0000000000000000 0000000000000001 
    0000000000000000 0000000000000000 

Contents of the .debug_str section:

  0x00000000 742e7300 2f736372 61746368 2f616c61 t.s./scratch/ala
  0x00000010 72636865 722f6f69 2d757365 726c616e rcher/oi-userlan
  0x00000020 642f636f 6d706f6e 656e7473 2f646576 d/components/dev
  0x00000030 656c6f70 65722f67 63632d38 2f627569 eloper/gcc-8/bui
  0x00000040 6c642f69 38362f67 63630047 4e552041 ld/i86/gcc.GNU A
  0x00000050 5320322e 333000                     S 2.30.