paule32 / pascal_remote_assembly

Transforms pascal code to asmjit remote assembly code. Then the code will be prepare to compile with nasm. And the result is a test.asm, and test.o file. The source code is based on msys2 MingW64 GNU C/C++

pascal_remote_assembly

Transforms pascal code to asmjit remote assembly code. Then the code will be prepare to compile with nasm. And the result is a test.asm, and test.o file. The source code is based on msys2 MingW64 GNU C/C++

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I used Bison, and Flex - which are called yacc, and flex, too, to create the Pascal-Parser. To use this Toolchain, you can use the build.sh script.

1. ~# ./build.sh -a
2. ~# ./build.sh -i
3. ~# cd temp
4. ~temp# ./pc.exe test.pas
5. ~temp# ./diss.exe test_nasm.asm

The Generator (pc.exe) produce this assembly code (with help of build.sh script):

section .text
L1:
    push rbp
    mov rbp, rsp
    sub rsp, 0x20
    mov ecx, 0
    mov rdx, Lv_Entry__lpText
    mov r8, Lv_Entry__lpCapt
    mov r9d, 2
    call MessageBoxA
L0:
    mov rsp, rbp
    pop rbp
    ret
L3:
    push rbp
    mov rbp, rsp
    sub rsp, 0x40
    mov rcx, qword [rsp+0x20]
    mov rdx, qword [rsp+0x28]
    mov r8, qword [rsp+0x30]
    mov r9, qword [rsp+0x38]
    call MessageBoxA
L2:
    mov rsp, rbp
    pop rbp
    ret

; T 0x00007ff94990ca50 MessageBoxA
; T 0x00007ff645893f84 Lv_Entry__lpText
; T 0x00007ff64589404c Lv_Entry__lpCapt
; T 0x00007ff900000002 Lv_Entry__lpMsgM
Lv_Entry__lpText:
	db "huhuhaha"
Lv_Entry__lpCapt:
	db "mumu", 0
Lv_Entry__lpMsgM:
	dd 0x2 
; T 0x00007ff94990ca50 MessageBoxA
MessageBoxA:
	dq 0x00007ff94990ca50

And the Interpreter (diss.exe) reads the AsmJit pimped Code, and produce this one:

// -------------------------------------------------------------------
// AsmJIT automatically created C++ source file.
// (c) 2023 kallup non-profit - Jens Kallup - paule32
// all rights reserved.
//
// only for education, and non-profit usage.
// -------------------------------------------------------------------
# include <stdio.h>
# include <stdlib.h>
# include <strings.h>
# include <libintl.h>    // localization

# include <iostream>
# include <sstream>
# include <cstring>
# include <string>

#include <asmjit/x86.h>
#include <stdio.h>

using namespace asmjit;

// Signature of the generated function.
typedef int (*Func)(void);

void yyerror(const char* msg) {
	std::cout << "error: " << msg << std::endl;
	exit(1);
}

// -------------------------------------------------------------------
// this is our "nain" entry point of application start.
// -------------------------------------------------------------------
int main(int argc, char **argv)
{
	JitRuntime rt;                     // Runtime specialized for JIT code executin.
	Error err;

	CodeHolder code;                   // Holds code and relocation information.
	code.init(rt.environment(),        // Initialize code to matchthe JIT environment.
	          rt.cpuFeatures());

	x86::Assembler a(&code);           // Create and attach x86::Assembler to code.

	Section* section_text;
	err = code.newSection(&section_text, "text", SIZE_MAX, SectionFlags::kNone, 8);
	if (err)
	yyerror(gettext("failed to create section: sect_text"));

	Label lbl_L1 = a.newNamedLabel("L1", SIZE_MAX);
	err = a.bind(lbl_L1);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_L0 = a.newNamedLabel("L0", SIZE_MAX);
	err = a.bind(lbl_L0);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_L3 = a.newNamedLabel("L3", SIZE_MAX);
	err = a.bind(lbl_L3);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_L2 = a.newNamedLabel("L2", SIZE_MAX);
	err = a.bind(lbl_L2);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_Lv_Entry__lpText = a.newNamedLabel("Lv_Entry__lpText", SIZE_MAX);
	err = a.bind(lbl_Lv_Entry__lpText);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_Lv_Entry__lpCapt = a.newNamedLabel("Lv_Entry__lpCapt", SIZE_MAX);
	err = a.bind(lbl_Lv_Entry__lpCapt);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_Lv_Entry__lpMsgM = a.newNamedLabel("Lv_Entry__lpMsgM", SIZE_MAX);
	err = a.bind(lbl_Lv_Entry__lpMsgM);
	if (err)
	yyerror(gettext("failed bind label"));
	Label lbl_MessageBoxA = a.newNamedLabel("MessageBoxA", SIZE_MAX);
	err = a.bind(lbl_MessageBoxA);
	if (err)
	yyerror(gettext("failed bind label"));
	a.mov(x86::eax, 2);
	a.ret();
	// ==== x86::Assembler is no longer needed from here, and we can destroyed ==== 

	Func fn;                           // Holds address to the generated function.
	err = rt.add(&fn, &code);          // Add the generated code to run
	if (err)                           // Handle a possible error returbed by asmjit.
	yyerror(gettext("failed added function"));
	// ==== CodeHolder is no longer needed from here, and we can destroyed ==== 

	int result = fn();                 // Execute the generated code.
	printf("%d\n", result);            // Print the result.

	// All classes use RAII, all resources will be released before `main()` returns,
	// the generated function can be, however, released explicitly if you intend to
	// reuse or keep the runtime alive, which you should in a production-ready code.
	rt.release(fn);

	return EXIT_SUCCESS;
}