flexpasm 0.2.1

Python library for writing assembly code through object abstractions

flexpasm

Python library for writing assembly code through object abstractions. For Linux FASM.
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Getting Started · Basic Usage · Specifications · License

flexpasm is a library for assembly language metaprogramming (FASM LINUX) via OOP, object relations. It also includes several useful tools for working with assembly code

Python library for writing assembly code through object abstractions. For Linux FASM.

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Getting Started

flexpasm is available on PyPI. Simply install the package into your project environment with PIP:

pip install flexpasm

Once installed, you can start using the library in your Python projects. Check out the documentation for detailed usage examples and API reference.

Basic Usage

Using templates

from flexpasm.instructions.segments import Label
from flexpasm.mnemonics import JmpMnemonic
from flexpasm.program import ASMProgram
from flexpasm.settings import Settings
from flexpasm.templates import PrintStringTemplate


def main():
    settings = Settings(
        title="Example ASM Program with Templates",
        author="alexeev-prog",
        filename="example_templates.asm",
        mode="32",
    )
    asmprogram = ASMProgram(settings, __name__)

    pst = PrintStringTemplate("Hello, World!")
    pst2 = PrintStringTemplate("Hello, World!", "msg2", "print_string2")
    start_lbl = Label("start")

    start_lbl.add_instruction(
        JmpMnemonic("print_string"), 1, comment="Jump to print strint template"
    )

    asmprogram.add_label(start_lbl)
    asmprogram.add_template(pst)
    asmprogram.add_template(pst2)

    asmprogram.save_code()


if __name__ == "__main__":
    main()

$ fasm example_templates.asm example_templates
$ ./example_templates

Hello, World!

ASM Code:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Author: alexeev-prog                                                                                               ;;
;; Example ASM Program with Templates                                                                                 ;;
;; Program generated by FLEXPASM (github.com/alexeev-pro/flexpasm)                                                    ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format ELF executable 3;                        ; ELF EXECUTABLE
entry start                                     ; Set Start Entry


;; Segment readable executable in FASM is a directive for defining a section of code with readable and executable attributes.
segment readable executable

start:                                          ; Label start with 1 commands
    JMP print_string                                ; Unconditional jump to label print_string; Jump to print strint template

print_string:                                   ; Label print_string with 7 commands
    MOV EAX, 4                                      ; Loading 4 value into EAX register.
    MOV ECX, msg                                    ; Loading msg value into ECX register.
    MOV EDX, msg_size                               ; Loading msg_size value into EDX register.
    INT 128                                         ; Call software interrupt 128: SYSCALL
    MOV EAX, 1                                      ; Loading 1 value into EAX register.
    MOV EBX, EBX                                    ; Exclusive OR operation EBX and EBX using XOR
    INT 128                                         ; Call software interrupt 128: SYSCALL

print_string2:                                  ; Label print_string2 with 7 commands
    MOV EAX, 4                                      ; Loading 4 value into EAX register.
    MOV ECX, msg2                                   ; Loading msg2 value into ECX register.
    MOV EDX, msg2_size                              ; Loading msg2_size value into EDX register.
    INT 128                                         ; Call software interrupt 128: SYSCALL
    MOV EAX, 1                                      ; Loading 1 value into EAX register.
    MOV EBX, EBX                                    ; Exclusive OR operation EBX and EBX using XOR
    INT 128                                         ; Call software interrupt 128: SYSCALL


;; Segment readable writeable in FASM is a definition of a segment of program data codes, where the attributes readable (the contents of the segment can be read) and writeable (program commands can both read codes and change their values) are specified for it.
segment readable writeable

message db 'Hello, World!', 0xA                 ; Var message (string)
message_size = $-message                        ; Var message (string) length

message db 'Hello, World!', 0xA                 ; Var message (string)
message_size = $-message                        ; Var message (string) length

Simple

from flexpasm import ASMProgram
from flexpasm.constants import LinuxInterrupts
from flexpasm.instructions.registers import get_registers
from flexpasm.instructions.segments import Label
from flexpasm.mnemonics import IntMnemonic, MovMnemonic, XorMnemonic
from flexpasm.settings import Settings


def main():
    settings = Settings(
        title="Example ASM Program",
        author="alexeev-prog",
        filename="example.asm",
        mode="64",
    )
    asmprogram = ASMProgram(settings, __name__)
    regs = get_registers(settings.mode)

    start_lbl = Label("start")

    start_lbl.add_instruction(MovMnemonic(regs.AX, 4))
    start_lbl.add_instruction(MovMnemonic(regs.CX, "message"))
    start_lbl.add_instruction(MovMnemonic(regs.DX, "message_size"))
    start_lbl.add_instruction(IntMnemonic(LinuxInterrupts.SYSCALL))
    start_lbl.add_instruction(MovMnemonic(regs.AX, 1))
    start_lbl.add_instruction(XorMnemonic(regs.BX, regs.BX))
    start_lbl.add_instruction(IntMnemonic(LinuxInterrupts.SYSCALL))

    asmprogram.add_label(start_lbl)
    asmprogram.main_rws.add_string("message", "Hello, World!")

    asmprogram.save_code()
    # asmprogram.restore_backup()


if __name__ == "__main__":
    main()

$ fasm example.asm example
$ ./example

Hello, World!

Generated ASM code:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Author: alexeev-prog                                                                                               ;;
;; Example ASM Program                                                                                                ;;
;; Program generated by FLEXPASM (github.com/alexeev-pro/flexpasm)                                                    ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

format ELF64 executable 3;                      ; ELF64 EXECUTABLE
entry start                                     ; Set Start Entry


;; Segment readable executable in FASM is a directive for defining a section of code with readable and executable attributes.
segment readable executable

start:                                          ; Label start with 7 commands
    MOV RAX, 4                                      ; Loading 4 value into RAX register.
    MOV RCX, message                                ; Loading message value into RCX register.
    MOV RDX, message_size                           ; Loading message_size value into RDX register.
    INT 128                                         ; Call software interrupt 128: SYSCALL
    MOV RAX, 1                                      ; Loading 1 value into RAX register.
    MOV RBX, RBX                                    ; Exclusive OR operation RBX and RBX using XOR
    INT 128                                         ; Call software interrupt 128: SYSCALL


;; Segment readable writeable in FASM is a definition of a segment of program data codes, where the attributes readable (the contents of the segment can be read) and writeable (program commands can both read codes and change their values) are specified for it.
segment readable writeable

message db 'Hello, World!', 0xA                 ; Var message (string)
message_size = $-message                        ; Var message (string) length

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💬 Support

If you encounter any issues or have questions about pyEchoNext, please:

• Check the documentation for answers
• Open an issue on GitHub
• Reach out to the project maintainers via the mailing list

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🤝 Contributing

We welcome contributions from the community! If you'd like to help improve pyEchoNext, please check out the contributing guidelines to get started.

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Specifications

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License

Distributed under the MIT License. See LICENSE for more information.

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