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- ## ELF Header
- 7f 45 4c 46 ## e_ident[EI_MAG0-3] ELF's magic number
- 02 ## e_ident[EI_CLASS] Indicating 64 bit
- 01 ## e_ident[EI_DATA] Indicating little endianness
- 01 ## e_ident[EI_VERSION] Indicating original elf
- 00 ## e_ident[EI_OSABI] Set at 0 because none cares
- 00 ## e_ident[EI_ABIVERSION] See above
- 00 00 00 00 00 00 00
- 02 00 ## e_type Indicating Executable
- 3e 00 ## e_machine Indicating AMD64
- 01 00 00 00 ## e_version Indicating original elf
- b0 00 40 00 00 00 00 00 ## e_entry Address of the entry point
- 40 00 00 00 00 00 00 00 ## e_phoff Address of program header table
- 00 00 00 00 00 00 00 00 ## e_shoff Address of section header table
- 00 00 00 00 ## e_flags
- 40 00 ## e_ehsize Indicating our 64 Byte header
- 38 00 ## e_phentsize size of a program header table
- 02 00 ## e_phnum number of entries in program table
- 40 00 ## e_shentsize size of a section header table
- 00 00 ## e_shnum number of entries in section table
- 00 00 ## e_shstrndx index of the section names
- ## Program Header table
- 01 00 00 00 ## p_type
- 05 00 00 00 ## Flags
- 00 00 00 00 00 00 00 00 ## p_offset
- 00 00 40 00 00 00 00 00 ## p_vaddr
- 00 00 40 00 00 00 00 00 ## Undefined
- 11 01 00 00 00 00 00 00 ## p_filesz
- 11 01 00 00 00 00 00 00 ## p_memsz
- 00 00 20 00 00 00 00 00 ## Required alignment
- ## BSS section header
- 01 00 00 00 ## p_type
- 06 00 00 00 ## Flags
- 14 01 00 00 00 00 00 00 ## p_offset
- 14 01 60 00 00 00 00 00 ## p_vaddr
- 14 01 60 00 00 00 00 00 ## Undefined
- 00 00 00 00 00 00 00 00 ## p_filesz
- 00 00 40 00 00 00 00 00 ## p_memsz (4MB)
- 00 00 20 00 00 00 00 00 ## Required alignment
- :_start
- c6 04 25 e4 01 60 00 # movb $0x54,0x6001e4
- 54
- c6 04 25 e5 01 60 00 # movb $0x65,0x6001e5
- 65
- c6 04 25 e6 01 60 00 # movb $0x73,0x6001e6
- 73
- c6 04 25 e7 01 60 00 # movb $0x74,0x6001e7
- 74
- c6 04 25 e8 01 60 00 # movb $0x53,0x6001e8
- 53
- c6 04 25 e9 01 60 00 # movb $0x54,0x6001e9
- 54
- c6 04 25 ea 01 60 00 # movb $0x72,0x6001ea
- 72
- 48 c7 c0 04 02 60 00 # mov $0x600204,%rax
- e8 *getstr # callq 400131 <getstr>
- 48 c7 c0 01 00 00 00 # mov $0x1,%rax
- 48 c7 c7 01 00 00 00 # mov $0x1,%rdi
- 48 c7 c6 04 02 60 00 # mov $0x600204,%rsi
- 48 c7 c2 2a 00 00 00 # mov $0x2a,%rdx
- 0f 05 # syscall
- 48 c7 c1 e4 01 60 00 # mov $0x6001e4,%rcx
- 48 c7 c2 04 02 60 00 # mov $0x600204,%rdx
- e8 *strcmp # callq 4001ae <strcmp>
- 48 89 c7 # mov %rax,%rdi
- 48 c7 c0 3c 00 00 00 # mov $0x3c,%rax
- 0f 05 # syscall
- :getstr
- 48 89 c3 # mov %rax,%rbx
- :getstr.loop
- e8 *getchar # callq 40014b <getchar>
- 48 83 f8 ff # cmp $0xffffffffffffffff,%rax
- 74 .getstr.done # je 400147 <getstr.done>
- 88 03 # mov %al,(%rbx)
- 48 83 c3 01 # add $0x1,%rbx
- eb .getstr.loop # jmp 400134 <getstr.loop>
- :getstr.done
- c6 03 00 # movb $0x0,(%rbx)
- c3 # retq
- :getchar
- 48 c7 c0 00 00 00 00 # mov $0x0,%rax
- 48 c7 c7 00 00 00 00 # mov $0x0,%rdi
- 48 8d 34 25 2e 02 60 # lea 0x60022e,%rsi
- 00
- 48 c7 c2 01 00 00 00 # mov $0x1,%rdx
- 0f 05 # syscall
- 48 83 f8 01 # cmp $0x1,%rax
- 75 .getchar.getchar_fail # jne 40017f <getchar.getchar_fail>
- 48 c7 c0 00 00 00 00 # mov $0x0,%rax
- 8a 04 25 2e 02 60 00 # mov 0x60022e,%al
- c3 # retq
- :getchar.getchar_fail
- 48 c7 c0 ff ff ff ff # mov $0xffffffffffffffff,%rax
- c3 # retq
- :putchar
- 88 04 25 2e 02 60 00 # mov %al,0x60022e
- 48 c7 c0 01 00 00 00 # mov $0x1,%rax
- 48 c7 c7 01 00 00 00 # mov $0x1,%rdi
- 48 8d 34 25 2e 02 60 # lea 0x60022e,%rsi
- 00
- 48 c7 c2 01 00 00 00 # mov $0x1,%rdx
- 0f 05 # syscall
- c3 # retq
- :strcmp
- 8a 01 # mov (%rcx),%al
- 8a 1a # mov (%rdx),%bl
- 3c 00 # cmp $0x0,%al
- 74 .strcmp.al.eq # je 4001c7 <strcmp.al.eq>
- 80 fb 00 # cmp $0x0,%bl
- 74 .strcmp.bl.eq.2 # je 4001dc <strcmp.bl.eq.2>
- 38 d8 # cmp %bl,%al
- 75 .strcmp.bl.eq.2 # jne 4001dc <strcmp.bl.eq.2>
- 48 ff c1 # inc %rcx
- 48 ff c2 # inc %rdx
- eb .strcmp # jmp 4001ae <strcmp>
- :strcmp.al.eq
- 80 fb 00 # cmp $0x0,%bl
- 74 .strcmp.bl.eq.1 # je 4001d4 <strcmp.bl.eq.1>
- 48 c7 c0 01 00 00 00 # mov $0x1,%rax
- c3 # retq
- :strcmp.bl.eq.1
- 48 c7 c0 00 00 00 00 # mov $0x0,%rax
- c3 # retq
- :strcmp.bl.eq.2
- 48 c7 c0 01 00 00 00 # mov $0x1,%rax
- c3 # retq
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