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Questions tagged [data-segment]

54 questions
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Data segment vs stack

A global variable is allocated in the data segment, while a local one stays in the stack. I know that accessing a variable stored in the heap is slower than accessing a local variable, but I don't know if accessing a local variable is faster than…
Francesco Di Lauro
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Legal data segement constructions

I would like to get some help with this questions: what is correct and legal in following definition of the data segment: data segment x db -23, 3 or 4, not -3, 9 xor 15, 129, $+x, SEG x, -128 LT 80h db -129, x+1, b2h, 256, 7852h, byte…
Bogdan M.
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How to handle data type conversation in python?

I am doing the data segmentation using python for some csv data. I have below columns like Actionid, name, title. The data in given column is like; Currently I am getting below error My code is ; import pandas as pd # for dataframes import…
Amaze_Rock
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Matplotlib: How can i use a column as data segmentation on matplotlib?

i've a question about matplotlib. I have a table just like this. data = pd.Dataframe(alldata) print(data) index | id | type | date | value | --------------------------------------- 0 | 1 | apples | 01-01-15| 100.00| 0 | 1 | apples …
Diego Luchetti
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apply heat map to the opencv rectangle

iam trying to apply a heat map on a selected portion[people's face] of my picture. Here is what i had done so far... the rectangle will be applied to the face . the face will be cropped heat map will be applied to the cropped image. # Draw a…
natasha
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Cannot set more segment Assembly

I Cannot set more segment or array. Assembly i think is because i dont have space or something IDEAL MODEL huge P386 STACK 256 DATASEG pcxA DB 65200 DUP(?) SEGMENT pcx para public 'DATA' DB 65200…
Gad
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Memory allocation layout issues in C (64-bit)

I wanted to understand how a "C" program runs and store the data in machine. So I looked into Memory Layout of C from here and I followed the same instructions in my machine which is 64-bit. First when I wrote the program (main has only return 0;)…
heeat
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uninitialized variables of a object file not showing in linux size command

Created a source file test1.c with the following code : #include #include int x = 15; int d = 15; int m = 18; int k = 0; int c = 0; int l; int main() { int y = 5; int ma = 10; int am = 10; printf("Hello…
New_Bee
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Two Stacks in Assembler?

I am coding in 8086 assembler and I have ran into an interesting question. The topic is to evaluate parentheses. If this was a question in Java or C, I would simply define two stacks - one for numbers, and another for operands. Can I do something…
DoronZor
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Does QEMU have restriction on executing a command from DATA section?

I'm using QEMU to simulate an ARM11 CPU. My program is too complicated to explain here, so i'll project the issue into a simpler program. So my program contains 2 c files: main.c some_code.c I'm compiling some_code.c (into some_code.o) and then i…
OmriR
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Why global variables are stored in heap?

Why in the following example the global variables are stored in the heap segment, instead of the data/bss segment? From the following output of the maps pseudo-file, the data/bss segment is the 3rd line. This is because it is read/write, and…
Paschalis
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How to get Data Segment Size in C++

I need to do analysis of memory requirements of one library written in C++, because HW engineers need get some idea about memory requirements of our hardware, there are working on. I can measure heapsize peak, I can measure stack size, but I don't…
Tomas Kubes
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data in data segment not accessible

I have some problems when accessing data when it is located in section .data I wrote a small program in assembler (using NASM) which consists of a bootloader that loads some 'kernel' code. This kernel code is then executed once loaded in…
Chris
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Assembly: data segment when called from C or created as an independent program

I'm confused about this; I don't think that there should be any difference in both cases , the program ends up as exe file. Please help if you think a differ.... Let me clarify my question: Is there is a difference in the data segment …
aristotaly
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How can I read data from data segment using x86 assembly?

Im using nasm32, x86 assembly language. I want to read some number from data segment. .model small .stack .data DATA1 DB 53H,"$" DATA2 DB 17H,"$" .code .startup mov dx, @data mov dx, offset DATA1 add dl,30h mov ah, 02h int 21h mov…
Flask_KR
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