isolate.c

#include <sys/mman.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <mach-o/dyld.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define abc_stuff(var) char* var = malloc(sizeof(char) * 5); memcpy(var,&"hello",5); fprintf(stderr,"%s: %s\n",#var,var);

int main(){
	for(int i = 0; i < 2; i++){
		abc_stuff(abc1);
	}
	int gExeFd = open("/Users/kkirbatski/Downloads/OpenRCT2/openrct2.exe",O_RDONLY);
	if (gExeFd < 0) {
		fprintf(stderr,"failed to open errno = %d\n",errno);
		exit(1);
	}

	off_t file_size = 6750208;

	int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
	// section: rw data
	void *gDataSegment = mmap((void *)0x8a4000, len, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANON | MAP_SHARED, 0, 0);
	if (gDataSegment != (void *)0x8a4000) {
		fprintf(stderr,"mmap failed to get required offset for data segment! got %p, expected %p, errno = %d", gDataSegment, (void *)(0x8a4000), errno);
		exit(1);
	}

	len = 0x004A3000;
	// section: text
	void *gTextSegment = mmap((void *)(0x401000), len, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_FIXED | MAP_PRIVATE, gExeFd, 0x1000);
	if (gTextSegment != (void *)(0x401000)){
		fprintf(stderr,"mmap failed to get required offset for text segment! got %p, expected %p, errno = %d\n", gTextSegment, (void *)(0x401000), errno);
		exit(1);
	}
	for(int i = 0; i < 2; i++){
		abc_stuff(abc2);
	}
	
	return 0;
}