#import <Foundation/Foundation.h>

struct Block_layout {
    void *isa;
    int flags;
    int reserved;
    void (*invoke)(void *, ...);
    struct Block_descriptor *descriptor;
};

int main(int argc, char *argv[]) {
    @autoreleasepool {
        // Block that doesn't take or return anything
        void(^block)() = ^{
            NSLog(@"Howdy %i", argc);
        };

        // Cast to a struct with the same memory layout
        struct Block_layout *blockStr = (struct Block_layout *)(__bridge void *)block;

        // Now do same as `block()':
        blockStr->invoke(blockStr);




        // Block that takes an int and returns an int
        int(^returnBlock)(int) = ^int(int a){
            return a;
        };

        // Cast to a struct with the same memory layout
        struct Block_layout *blockStr2 = (struct Block_layout *)(__bridge void *)returnBlock;

        // Now do same as `returnBlock(argc)':
        int ret = ((int(*)(void*, int a, ...))(blockStr2->invoke))(blockStr2, argc);
        NSLog(@"ret = %i", ret);
    }
}

Howdy 1
ret = 1

#import <mach/mach_init.h>
#import <mach/vm_map.h>

void *remap_address(void* address, int page_count)
{
    vm_address_t source_address = (vm_address_t) address;
    vm_address_t source_page = source_address & ~PAGE_MASK;

    vm_address_t destination_page = 0;
    vm_prot_t cur_prot;
    vm_prot_t max_prot;
    kern_return_t status = vm_remap(mach_task_self(),
                                &destination_page,
                                PAGE_SIZE*(page_count ? page_count : 4),
                                0,
                                VM_FLAGS_ANYWHERE,
                                mach_task_self(),
                                source_page,
                                FALSE,
                                &cur_prot,
                                &max_prot,
                                VM_INHERIT_NONE);

    if (status != KERN_SUCCESS)
    {
        return NULL;
    }

    vm_address_t destination_address = destination_page | (source_address & PAGE_MASK);

    return (void*) destination_address;
}