Usage: elfloader [--perms] [--binary] [--base=<addr>] <input ELF> <output>
    --binary      - Don't output a FELF, output the raw loaded image with no
                    metadata
    --perms       - Create a FELF0002 which includes permission data, overrides
                    --binary
    --base=<addr> - Force the output to start at `<addr>`, zero padding from
                    the base to the start of the first LOAD segment if needed.
                    `<addr>` is default hex, can be overrided with `0d`, `0b`,
                    `0x`, or `0o` prefixes.
                    Warning: This does not _relocate_ to base, it simply starts
                    the output at `<addr>` (adding zero bytes such that the
                    output image can be loaded at `<addr>` instead of the
                    original ELF base)
    <input ELF>   - Path to input ELF
    <output>      - Path to output file

pleb@gamey ~/elfloader/example_small_program $ make
cargo build --release
    Finished release [optimized] target(s) in 0.03s
elfloader --binary target/aarch64-unknown-none/release/example_small_program example.bin
pleb@gamey ~/elfloader/example_small_program $ ls -l ./example.bin 
-rw-r--r-- 1 pleb pleb 8 Nov  8 12:27 ./example.bin

pleb@gamey ~/elfloader/example_small_program $ objdump -d target/aarch64-unknown-none/release/example_small_program

target/aarch64-unknown-none/release/example_small_program:     file format elf64-littleaarch64


Disassembly of section .text:

00000000133700b0 <_start>:
    133700b0:   8b000020        add     x0, x1, x0
    133700b4:   d65f03c0        ret

pleb@gamey ~/elfloader/example_program_with_data $ make
cargo build --release
    Finished release [optimized] target(s) in 0.04s
elfloader --binary target/aarch64-unknown-none/release/example_program_with_data example.bin
pleb@gamey ~/elfloader/example_program_with_data $ ls -l ./example.bin
-rw-r--r-- 1 pleb pleb 29 Nov  8 12:39 ./example.bin
pleb@gamey ~/elfloader/example_program_with_data $ objdump -d target/aarch64-unknown-none/release/example_program_with_data

target/aarch64-unknown-none/release/example_program_with_data:     file format elf64-littleaarch64


Disassembly of section .text:

0000000013370124 <_start>:
    13370124:   90000000        adrp    x0, 13370000 <_start-0x124>
    13370128:   90000008        adrp    x8, 13370000 <_start-0x124>
    1337012c:   52800029        mov     w9, #0x1                        // #1
    13370130:   91048000        add     x0, x0, #0x120
    13370134:   3904f109        strb    w9, [x8, #316]
    13370138:   d65f03c0        ret
pleb@gamey ~/elfloader/example_program_with_data $ readelf -l target/aarch64-unknown-none/release/example_program_with_data

Elf file type is EXEC (Executable file)
Entry point 0x13370124
There are 4 program headers, starting at offset 64

Program Headers:
  Type           Offset             VirtAddr           PhysAddr
                 FileSiz            MemSiz              Flags  Align
  LOAD           0x0000000000000120 0x0000000013370120 0x0000000013370120
                 0x0000000000000004 0x0000000000000004  R      0x1
  LOAD           0x0000000000000124 0x0000000013370124 0x0000000013370124
                 0x0000000000000018 0x0000000000000018  R E    0x4
  LOAD           0x000000000000013c 0x000000001337013c 0x000000001337013c
                 0x0000000000000000 0x0000000000000001  RW     0x4
  GNU_STACK      0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000000 0x0000000000000000  RW     0x0

 Section to Segment mapping:
  Segment Sections...
   00     .rodata 
   01     .text 
   02     .bss 
   03     

FELF0001 - Magic header
entry    - 64-bit little endian integer of the entry point address
base     - 64-bit little endian integer of the base address to load the image
<image>  - Rest of the file is the raw image, to be loaded at `base` and jumped
           into at `entry`

FELF0002 - Magic header
entry    - 64-bit little endian integer of the entry point address
base     - 64-bit little endian integer of the base address to load the image
<image>  - Rest of the file is the raw image, to be loaded at `base` and jumped
           into at `entry`
<perms>  - Permissions, matching the bytes of <image> where the byte contains
           the following flags bitwise or-ed together:
           0x01 - Executable, 0x02 - Writable, 0x04 - Readable
           Padding bytes will be 0x00, and thus have no permissions for any
           access