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Questions tagged [relative-addressing]

49 questions
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Why gdb shows different addresses in RIP-relative mode from absolute address?

Having this in c: #include #include int x; int main(){ printf("eneter x\n"); scanf("%i",&x); printf("you enetered: %i\n", x); return 0; } in gdb: starti disas main 0x0000555555555155 <+0>: push %rbp …
autistic456
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using relative addressing for API inside Axios request

I'm working on an application where the URL/path to the API's CRUD functions are defined like so: var newApiAddresses = { itemsGet: "url('itembook_test_api_v1_apiitems_getitems'); ?>", itemAdd: "
jimiss
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Is there a method to localize literal pool in C like "ltorg" in assembly?

I am implementing a C function which will be copied to an other memory location during run time. I have avoided function calls inside it, only using pure constant inside it. When I examine the assembly output, the constant access is translated into…
Eric Sun
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How can I jump relative to the PC using the gnu assembler for AVR?

I have a binary file that I've disassembled using avr-objcopy. The interrupt vector table looks like: 00000000 : ; VECTOR TABLE 0: 13 c0 rjmp .+38 ; 0x28, RESET 2: b8 c1 rjmp .+880 ; 0x374,…
kroylar
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Video not playing in ASP.NET Core MVC

I created a project with ASP.NET Core 6 MVC web app. In this project, videos are uploaded. To prevent all users from accessing the videos, a folder named "File" was created outside the wwwroot and the videos were uploaded to the File folder. Videos…
Mohammad
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Correct usage of the RIP related addressing

I found example of code on assembly, which finds the maximum number in array named data_items but that example was for x86 and I tried to adapt it for x64 because 32 bit absolute addressing is not supported by 64 bit system. To be short there are…
Arsynth
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Pointer to the text segment from the data segment

Is it possible to do the following with this relative addressing in x86-64? section .text two dq 0 section .data one: dq two When I do it this way on OS X with nasm, I get the following linker warning: ld: warning: PIE disabled. Absolute…
Matt Fichman
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Why can `%rip + displacement` access data section?

The usage of this is that I saw after used gcc -S. I know ary represents the first address of the sequence, then I also know leaq ary(, %rdi, 4) has the same effect(assume %rdi equals 0). But I don't understand, why can ary(%rip) access data…
OnlyWick
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Force RIP-relative access to fixed offset in NASM

For a binary instrumentation project I wrote a chunk of assembly code in NASM, which gets mapped into a binary's address space at runtime. The chunk gets loaded at address instrument_addr, and needs to access data at address…
janw
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lea assembly instruction syntax

Hi I am new to assembly language and I am getting confused about the syntax of lea instruction I have seen when I study a piece of code ( which is generated by using gdb command : disassemble main ). lea 0xa8e96(%rip),%rsi # 0x4aa5df The…
Zhezhong Jiang
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PyCUDA Memory Addressing: Memory offset?

I've got a large chunk of generated data (A[i,j,k]) on the device, but I only need one 'slice' of A[i,:,:], and in regular CUDA this could be easily accomplished with some pointer arithmetic. Can the same thing be done within pycuda? i.e…
Bolster
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Compiler-generated relative addresses and how they are represented in (preferably java) bytecode?

When address binding is not possible at compile time, it's done at load/link or runtime, to associate relative ( or perhaps we can call them relocatable addresses ) addresses with actual physical ones. Plus, the CPU also converts those relative…
stdout
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Addressing data using relative pointers (x86-32 assembler)

I'm writing in 32-bit x86 assembler, and I'm not quite sure how to address data that is always in the same relation to the code. Do I have to use EIP to calculate the absolute address, or is there a better way?
Neo_b
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ARM instruction to hex for loads like pc-relative LDR

I've been trying to translate the arm instruction to hex which include PC register, for example ldr rx, [pc, #xx] I have checked the "ARM Architecture Reference Manual", and the description of LDR instruction is as below: Questions appeared, …
SammyJiang
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How do two-pass assemblers deal with instructions that are expanded by the assembler?

Consider the following MIPS assembly (I'm using MIPS because that is what my Computer Organization and Design book uses): beq $s0, $s1, L1 add $t0, $t1, $t2 ... L1: ... Because MIPS only uses 16 bits for the PC-relative address in the beq…
Matthew
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