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Getting ptr from memory address with c++


Getting ptr from memory address with c++

By : Bourbons
Date : October 22 2020, 11:12 PM
hop of those help? You can't directly do this. Process address space is completely unique to your process -- 0xDEADBEEF can point to "Dog" in one process, while 0xDEADBEEF can point to "Cat" in another. You would have to make operating system calls that allow you to access another process' address space, and even then you'd have to guess. Many times that location will be different each run of the application -- you can't generally predict what the runtime layout of a process will be in all cases.
Assuming you're on Windows you'll need to (EDIT: You don't need A and B in all cases but you usually need them) A. be an administrator, B. take the SeDebugPrivilege for your process, C, open a handle to the process, and then D. use ReadProcessMemory/WriteProcessMemory to do what you want.
code :


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Linux - Duplicate a virtual memory address from malloc or move a virtual memory address

Linux - Duplicate a virtual memory address from malloc or move a virtual memory address


By : Geoff1328
Date : March 29 2020, 07:55 AM
hop of those help? The function you want to create multiple mappings of a page is shm_open.
You may only be using the memory within one process, but it's still "shared memory" - that is to say, multiple virtual mappings for the same underlying physical page will exist.
Hashcode is memory address or integer number of content of memory address?

Hashcode is memory address or integer number of content of memory address?


By : baoser
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The String class overrides hashCode() to produce deterministic results. The result has nothing to do with memory addresses. The String.hashCode() Javadoc shows the formula used to calculate it:
Can we start with memory address 37124H in memory address decoding?

Can we start with memory address 37124H in memory address decoding?


By : XoddX
Date : March 29 2020, 07:55 AM
To fix this issue You can't do it... with just a simple decoder. The requirement for an address range to be with the form of a non changing part, followed by a changing part that convers every possible combination of 0's and 1's is just to ease the circuitry: you connect the address lines of your memory to the changing bits, and the CS line of your memory to a decoder that detects whether the non changing part appears in corresponding address lines.
But you can actually build a circuit that makes possible to map some memory starting at any address you like (taking into account the granularity of the processor). Say you want to address 32KB of memory between addresses 37124h and 3F123h:
code :
module decoder (input [19:0] busaddr, /* addr from CPU */
                output [15:0] memaddr, /* addr to memory */
                output cs_n);  /* active low CS to memory */
  assign cs_n = (busaddr >= 20'h317124 && busaddr <= 20'h3F123)? 1'b0 : 1'b1;
  assign memaddr = busaddr - 20'h317124h;
endmodule
Find physical memory address from virtual memory address

Find physical memory address from virtual memory address


By : user2101351
Date : March 29 2020, 07:55 AM
it fixes the issue On Linux you can do it by parsing files in /proc/, namely, maps and pagemap. There is a little user-space tool that does it for you here.
Compile it (no special options are needed), run page-types -p -l -N, find the virtual page address in the first column, read the physical address in the second column.
Why does Dec memory address descend and Hex memory address ascend?

Why does Dec memory address descend and Hex memory address ascend?


By : iphoneDevGuy
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have written a C program to take input of 5 int/float/double values from the keyboard and store these in an array of the corresponding datatype.
code :
-516081056          e13d3a60
-516081052          e13d3a64
-516081048          e13d3a68
-516081044          e13d3a6c
-516081040          e13d3a70
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