- Used command: readelf -lWS <binary>

--------------------------------------------------------------------------------------------
- (1) The original layout
--------------------------------------------------------------------------------------------
Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00      0   0  0
  [ 1] .text             PROGBITS        0000000000100000 001000 017717 00 WAX  0   0 4096     <--- .text section has 0x1000 offset and begins with multiboot, which is fine because < 0x2000
  [ 2] .uk_ctortab       PROGBITS        0000000000118000 019000 000004 00  WA  0   0  1
  [ 3] .rodata           PROGBITS        0000000000119000 01a000 002cf2 00   A  0   0 32
  [ 4] .tbss             NOBITS          000000000011bcf8 01ccf2 001008 00 WAT  0   0  4
  [ 5] .data             PROGBITS        000000000011c000 01d000 000080 00  WA  0   0 32
  [ 6] .got.plt          PROGBITS        000000000011c080 01d080 000018 08  WA  0   0  8
  [ 7] .bss              NOBITS          000000000011d000 01d098 016000 00  WA  0   0 32
  [ 8] .comment          PROGBITS        0000000000000000 01d098 00002d 01  MS  0   0  1
  [ 9] .shstrtab         STRTAB          0000000000000000 01d0c5 000048 00      0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  l (large), p (processor specific)

Elf file type is EXEC (Executable file)
Entry point 0x107cf3
There are 3 program headers, starting at offset 64

Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
  LOAD           0x001000 0x0000000000100000 0x0000000000100000 0x01c098 0x033000 RWE 0x1000   <--- First segment has 0x1000 alignment
  TLS            0x01ccf2 0x000000000011bcf8 0x000000000011bcf8 0x000000 0x001008 R   0x4
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RWE 0x10

 Section to Segment mapping:
  Segment Sections...
   00     .text .uk_ctortab .rodata .data .got.plt .bss
   01     .tbss
   02

--------------------------------------------------------------------------------------------
- (2) After we align cpu_intr_stack to 0x10000, multiboot is moved beyond 0x2000
--------------------------------------------------------------------------------------------
Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00      0   0  0
  [ 1] .text             PROGBITS        0000000000100000 010000 017717 00 WAX  0   0 4096     <--- .text section has 0x10000 offset, but now multiboot is at > 0x2000
  [ 2] .uk_ctortab       PROGBITS        0000000000118000 028000 000004 00  WA  0   0  1
  [ 3] .rodata           PROGBITS        0000000000119000 029000 002cf2 00   A  0   0 32
  [ 4] .tbss             NOBITS          000000000011bcf8 02bcf2 001008 00 WAT  0   0  4
  [ 5] .data             PROGBITS        000000000011c000 02c000 000080 00  WA  0   0 32
  [ 6] .got.plt          PROGBITS        000000000011c080 02c080 000018 08  WA  0   0  8
  [ 7] .bss              NOBITS          0000000000120000 02c098 021000 00  WA  0   0 65536    <-- .bss new 0x10000 alignment
  [ 8] .comment          PROGBITS        0000000000000000 02c098 00002d 01  MS  0   0  1
  [ 9] .shstrtab         STRTAB          0000000000000000 02c0c5 000048 00      0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  l (large), p (processor specific)

Elf file type is EXEC (Executable file)
Entry point 0x107cf3
There are 3 program headers, starting at offset 64

Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
  LOAD           0x010000 0x0000000000100000 0x0000000000100000 0x01c098 0x041000 RWE 0x10000   <--- First segment has 0x10000 (> 0x1000) alignment
  TLS            0x02bcf2 0x000000000011bcf8 0x000000000011bcf8 0x000000 0x001008 R   0x4
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RWE 0x10

 Section to Segment mapping:
  Segment Sections...
   00     .text .uk_ctortab .rodata .data .got.plt .bss
   01     .tbss
   02

--------------------------------------------------------------------------------------------
- (3) We keep cpu_intr_stack aligned to 0x10000, but try to move multiboot info in a 
-     section of its own, putting it before .text section in the linker file.
--------------------------------------------------------------------------------------------
Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00      0   0  0
  [ 1] .multiboot        PROGBITS        0000000000000000 01d098 000020 00      0   0  4       <-- It has a bad offset, 0x1d098, because we cannot control the offset inside binary at this stage
  [ 2] .text             PROGBITS        0000000000100000 001000 017717 00 WAX  0   0 4096
  [ 3] .uk_ctortab       PROGBITS        0000000000118000 019000 000004 00  WA  0   0  1
  [ 4] .rodata           PROGBITS        0000000000119000 01a000 002cf2 00   A  0   0 32
  [ 5] .tbss             NOBITS          000000000011bcf8 01ccf2 001008 00 WAT  0   0  4
  [ 6] .data             PROGBITS        000000000011c000 01d000 000080 00  WA  0   0 32
  [ 7] .got.plt          PROGBITS        000000000011c080 01d080 000018 08  WA  0   0  8
  [ 8] .bss              NOBITS          000000000011d000 01d098 016000 00  WA  0   0 32
  [ 9] .comment          PROGBITS        0000000000000000 01d0b8 00002d 01  MS  0   0  1
  [10] .shstrtab         STRTAB          0000000000000000 01d0e5 000053 00      0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  l (large), p (processor specific)

Elf file type is EXEC (Executable file)
Entry point 0x107cf3
There are 3 program headers, starting at offset 64

Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
  LOAD           0x001000 0x0000000000100000 0x0000000000100000 0x01c098 0x033000 RWE 0x1000
  TLS            0x01ccf2 0x000000000011bcf8 0x000000000011bcf8 0x000000 0x001008 R   0x4
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RWE 0x10

 Section to Segment mapping:
  Segment Sections...
   00     .text .uk_ctortab .rodata .data .got.plt .bss
   01     .tbss
   02

--------------------------------------------------------------------------------------------
- (4) We move cpu_intr_stack to .intrstack section
--------------------------------------------------------------------------------------------
Section Headers:
  [Nr] Name              Type            Address          Off    Size   ES Flg Lk Inf Al
  [ 0]                   NULL            0000000000000000 000000 000000 00      0   0  0
  [ 1] .text             PROGBITS        0000000000100000 001000 017717 00 WAX  0   0 4096
  [ 2] .uk_ctortab       PROGBITS        0000000000118000 019000 000004 00  WA  0   0  1
  [ 3] .rodata           PROGBITS        0000000000119000 01a000 002cf2 00   A  0   0 32
  [ 4] .tbss             NOBITS          000000000011bcf8 01ccf2 001008 00 WAT  0   0  4
  [ 5] .data             PROGBITS        000000000011c000 01d000 000080 00  WA  0   0 32
  [ 6] .got.plt          PROGBITS        000000000011c080 01d080 000018 08  WA  0   0  8
  [ 7] .bss              NOBITS          000000000011d000 01d098 006000 00  WA  0   0 32
  [ 8] .intrstack        PROGBITS        0000000000130000 020000 010000 00  WA  0   0 65536
  [ 9] .comment          PROGBITS        0000000000000000 030000 00002d 01  MS  0   0  1
  [10] .shstrtab         STRTAB          0000000000000000 03002d 000053 00      0   0  1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  l (large), p (processor specific)

Elf file type is EXEC (Executable file)
Entry point 0x107cf3
There are 4 program headers, starting at offset 64

Program Headers:
  Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
  LOAD           0x001000 0x0000000000100000 0x0000000000100000 0x01c098 0x023000 RWE 0x1000
  LOAD           0x020000 0x0000000000130000 0x0000000000130000 0x010000 0x010000 RW  0x10000
  TLS            0x01ccf2 0x000000000011bcf8 0x000000000011bcf8 0x000000 0x001008 R   0x4
  GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RWE 0x10

 Section to Segment mapping:
  Segment Sections...
   00     .text .uk_ctortab .rodata .data .got.plt .bss
   01     .intrstack
   02     .tbss
   03