Linux Hello World machine code for 32-bit ARM, formatted in the binmark format

helloworld-arm32.bm

## 32-bit ARM ELF machine code

# Compile this to a binary using:
#  binmark helloworld-arm32.bm > helloworld-arm32
#  readelf -a ./helloworld-arm32
#  chmod a+rx helloworld-arm32
#  ./helloworld-arm32


## ELF File header

# 0x0000
7F "ELF"       # Magic number
01             # EI_CLASS (1 = 32-bit)
01             # EI_DATA (1 = little endian)
01             # EI_VERSION (version 1 of ELF)
00             # EI_OSABI (0 = 	System V)
00             # EI_ABIVERSION
00 00 00 00    # EI_PAD (7 bytes of padding)
00 00 00     


# 0x0010: 
02 00          # e_type: ET_EXEC (executable file)
28 00          # e_machine: ARM 32
01 00 00 00    # e_version: 1
74 00 01 00    # e_entry: memory address of the entry point to starts executing
34 00 00 00    # e_phoff: offset of the program header table
c0 00 00 00    # e_shoff: offset of the section header table.
00 02 00 05    # e_flags: architecture specific flags
34 00          # e_ehsize: size of this header (52 bytes)
20 00          # e_phentsize: the size of a program header table entry.
02 00          # e_phnum: the number of entries in the program header table.
28 00          # e_shentsize: the size of a section header table entry
04 00          # e_shnum: the number of entries in the section header table
03 00          # e_shstrndx: section names index in the section header table


# 0x0034: Program header
01 00 00 00    # p_type: PT_LOAD = Loadable segment
00 00 00 00    # p_offset: offset of the segment in the file image
00 00 01 00    # p_vaddr: virtual address of the segment in memory
00 00 01 00    # p_paddr: segment's physical address.
98 00 00 00    # p_filesz: size in bytes of the segment in the file image
98 00 00 00    # p_memsz: size in bytes of the segment in memory
05 00 00 00    # p_flags: segment-dependent flags
00 00 01 00    # p_align: byte alignment

# 0x0054: Program header
01 00 00 00    # p_type: PT_LOAD = Loadable segment
98 00 00 00    # p_offset: offset of the segment in the file image
98 00 02 00    # p_vaddr: virtual address of the segment in memory
98 00 02 00    # p_paddr: segment's physical address.
0d 00 00 00    # p_filesz: size in bytes of the segment in the file image
0d 00 00 00    # p_memsz: size in bytes of the segment in memory
06 00 00 00    # p_flags: segment-dependent flags
00 00 01 00    # p_align: byte alignment


# 0x0074: Program Section: .text
01 00 a0 e3    # mov r0, #1           (1 = STDOUT_FILENO)
14 10 9f e5    # ldr r1, [pc, #0x14]  (20 = offset to string)
0d 20 a0 e3    # mov r2, #0xd         (13 = string length)
04 70 a0 e3    # mov r7, #4           (4 = write syscall)
00 00 00 ef    # svc #0               (invoke Linux syscall 0)

00 00 a0 e3    # mov r0, #0           (0 = successful return code)
01 70 a0 e3    # mov r7, #1           (1 = exit syscall)
00 00 00 ef    # svc #0               (invoke Linux syscall 0)

98 00 02 00    # Is this the virtual address?
               # Where is this documented?


# 0x0098: Program Section: .data
"Hello World!\n"


# 0x00A5: Section Header Strings Table (shstrtab)
"\0"                 # 0x00: NULL
".shstrtab\0"        # 0x01
".text\0"            # 0x0b
".data\0"            # 0x11

# Padding
00 00 00 00


## Section Header Table

# 0x00C0: 0=NULL
00 00 00 00   # sh_name: offset to the section string table
00 00 00 00   # sh_type: NULL
00 00 00 00   # sh_flags: none
00 00 00 00   # sh_addr: virtual address of the section in memory
00 00 00 00   # sh_offset: offset of the section in the file image.
00 00 00 00   # sh_size: size in bytes of the section in the file image
00 00 00 00   # sh_link: the section index of an associated section
00 00 00 00   # sh_info:
00 00 00 00   # sh_addralign: the required alignment of the section
00 00 00 00   # sh_entsize: the size, in bytes, of each entry

# 0x00E8: 1=.text
0b 00 00 00   # sh_name: offset to the section string table
01 00 00 00   # sh_type: SHT_PROGBITS = Programme Data
06 00 00 00   # sh_flags: none
74 00 01 00   # sh_addr: virtual address of the section in memory
74 00 00 00   # sh_offset: offset of the section in the file image
24 00 00 00   # sh_size: size in bytes of the section in the file image
00 00 00 00   # sh_link: the section index of an associated section
00 00 00 00   # sh_info:
04 00 00 00   # sh_addralign: the required alignment of the section
00 00 00 00   # sh_entsize: the size, in bytes, of each entry

# 0x0110: 2=.data
11 00 00 00   # sh_name: offset to the section string table
01 00 00 00   # sh_type: SHT_PROGBITS = Programme Data
03 00 00 00   # sh_flags: none
98 00 02 00   # sh_addr: virtual address of the section in memory
98 00 00 00   # sh_offset: offset of the section in the file image
0d 00 00 00   # sh_size: size in bytes of the section in the file image
00 00 00 00   # sh_link: the section index of an associated section
00 00 00 00   # sh_info:
01 00 00 00   # sh_addralign: the required alignment of the section
00 00 00 00   # sh_entsize: the size, in bytes, of each entry

# 0x0138: 3=.shstrtab
01 00 00 00   # sh_name: offset to the section string table
03 00 00 00   # sh_type: SHT_STRTAB = 3
00 00 00 00   # sh_flags: none
00 00 00 00   # sh_addr: virtual address of the section in memory
a5 00 00 00   # sh_offset: offset of the section in the file image
17 00 00 00   # sh_size: size in bytes of the section in the file image
00 00 00 00   # sh_link: the section index of an associated section
00 00 00 00   # sh_info:
01 00 00 00   # sh_addralign: the required alignment of the section
00 00 00 00   # sh_entsize: the size, in bytes, of each entry

# 0x0170