flexpasm

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

You can view examples in examples directory.

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!", var="msg2", entry="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()

Launch this script and run the following commands:

$ fasm example_templates.asm example_templates
$ ld example_templates -o 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;                          ; 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
	; Printing the string 'Hello, World!' to stdout
	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 0x80                                        ; Call software interrupt 0x80: SYSCALL
	MOV EAX, 1                                      ; Loading 1 value into EAX register.
	XOR EBX, EBX                                    ; Exclusive OR operation EBX and EBX using XOR
	INT 0x80                                        ; Call software interrupt 0x80: SYSCALL

print_string2:                                  ; Label print_string2 with 7 commands
	; Printing the string 'Hello, World!' to stdout
	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 0x80                                        ; Call software interrupt 0x80: SYSCALL
	MOV EAX, 1                                      ; Loading 1 value into EAX register.
	XOR EBX, EBX                                    ; Exclusive OR operation EBX and EBX using XOR
	INT 0x80                                        ; Call software interrupt 0x80: 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

msg db 'Hello, World!', 0                       ; Var msg (string)
msg_size = $-msg                                ; Var msg (string) length

msg2 db 'Hello, World!', 0                      ; Var msg2 (string)
msg2_size = $-msg2                              ; Var msg2 (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() # Restore backup


if __name__ == "__main__":
    main()

$ fasm example.asm example
$ ld example -o 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

Registers

Code from library:

class Registers16(Enum):
    AX = Register16("AX")
    BX = Register16("BX")
    CX = Register16("CX")
    DX = Register16("DX")
    SP = Register16("SP")
    BP = Register16("BP")
    SI = Register16("SI")
    DI = Register16("DI")

    r10 = Register16("10")
    r8 = Register16("8")
    r9 = Register16("9")


class Registers32(Enum):
    AX = Register32("EAX")
    BX = Register32("EBX")
    CX = Register32("ECX")
    DX = Register32("EDX")
    SP = Register32("ESP")
    BP = Register32("EBP")
    SI = Register32("ESI")
    DI = Register32("EDI")

    r10 = Register32("e10")
    r8 = Register32("e8")
    r9 = Register32("e9")


class Registers64(Enum):
    AX = Register64("RAX")
    BX = Register64("RBX")
    CX = Register64("RCX")
    DX = Register64("RDX")
    SP = Register64("RSP")
    BP = Register64("RBP")
    SI = Register64("RSI")
    DI = Register64("RDI")

    r10 = Register64("r10")
    r8 = Register64("r8")
    r9 = Register64("r9")


def get_registers(mode: str) -> Union[Register16, Register32, Registers64]:
    if mode == "16":
        return Registers16
    elif mode == "32":
        return Registers32
    elif mode == "64":
        return Registers64

BaseMnemonic

BaseMnemonic is the base abstract assembler mnemonic class. Assembly language mnemonics are a fundamental part of any program.

Module: flexpasm.mnemonics

Supported Mnemonics:

• MovMnemonic
• IntMnemonic
• XorMnemonic
• AddMnemonic
• SubMnemonic
• JmpMnemonic
• IncMnemonic
• MulMnemonic
• DecMnemonic
• ShrMnemonic
• RorMnemonic
• RolMnemonic
• AndMnemonic
• OrMnemonic
• NotMnemonic
• DivMnemonic
• JeMnemonic
• JneMnemonic
• JgMnemonic
• JLMnemonic
• JgeMnemonic
• JleMnemonic
• CallMnemonic
• RetMnemonic
• PushMnemonic
• PopMnemonic
• XchgMnemonic
• SwapMnemonic
• IretMnemonic
• CmpMnemonic

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License

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

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