Hi eneryone,
Im trying to learn about assemply 8085 in order to make a project i have.
First of all which emulator to use? I work in linux and I currently istalled GNUSim8085.
Also, maybe somewhere I can find some simple examples?
The project is about making an array saved in specific places in the memory with specific number in it. So i started with learning the loop for. I tried, with my little MIPS experience to assemply this C code:
my effort is this code:
But i get errors in line 3. Anyway if anyone can help me please do so. I'm willing to learn and search with some help. Thanks.
Ps: What about gcc -S example.c ? What type of code i get in example.s?
I am currently looking into an os on developed on an x86 platformwhich contains certain assembly code written in .s files(NASM- compatible ) instead of using C I was wondering why C could not be used to do low level stuff instead? Do anyone have any idea or could enligthen me?Appreciate any help... (0 Replies)
Hey guys, well I'm extremely knew to Unix so any help advice is very appreciated.
What I am trying to do is assemble a source code (Programming from the Ground Up: Chapter 3: Your First Programs)
The source code named "FINDING A MAXIMUM VALUE" is the code I am trying to link and run, but I... (1 Reply)
I want make simple assembly code for some thing like this a^6+6a^2+2a and range of a is between -3 to 3. I tried but it is not working properly. As this is my first assembly program that I am going to try, I want some help with it.
I found this example online but i dont want this kind of... (2 Replies)
When i run this with gcc filename.s -o filename. It is giving fatal error: Unknown opcode at define registers.
Anyhelp will be appreciated
.section ".data"
prompt: .asciz "\nThis program prints the Fibonacci sequence"
prompt2: .asciz "\nEnter a limit on the largest number to be displayed:"... (2 Replies)
Hi guys,
Assembly language is a low level language designed in 1950's, both system and application programs were written in assembly at that time. There is no question of assembly being very effecient compared to the other high level languages. But it is very cumbersome to write programs in... (9 Replies)
Hi. I learned C in high school and am proficient in it:D. At the college while learning microcontrollers there was a short course on assembly language which I skipped:p but had no trouble as most of the application programming had to be done in C. Should I go back n learn assembly language as I... (9 Replies)
Im trying to make a vga program for linux Im wondering if anyone knows of a simple document on the subject or if someone could show me some basics. What system calls should I use what parameters should I give them. How do I draw a line of pixels green after in vga mode. I prefer nasm but I can use... (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I am having a hard time with this assignement i cant get the pfib value to print out the fib sequence.
... (1 Reply)
As the title suggests, I want to better understand the following assembly code:
section .text
global main ; must be declared for linker (gcc)
main: ; tell linker entry point
mov edx, len ; message length
mov ecx, msg ; message to write... (2 Replies)
Discussion started by: Azrael
2 Replies
LEARN ABOUT OSF1
cacheflush
CACHEFLUSH(2) Linux Programmer's Manual CACHEFLUSH(2)NAME
cacheflush - flush contents of instruction and/or data cache
SYNOPSIS
#include <asm/cachectl.h>
int cacheflush(char *addr, int nbytes, int cache);
DESCRIPTION
cacheflush() flushes the contents of the indicated cache(s) for the user addresses in the range addr to (addr+nbytes-1). cache may be one
of:
ICACHE Flush the instruction cache.
DCACHE Write back to memory and invalidate the affected valid cache lines.
BCACHE Same as (ICACHE|DCACHE).
RETURN VALUE
cacheflush() returns 0 on success or -1 on error. If errors are detected, errno will indicate the error.
ERRORS
EFAULT Some or all of the address range addr to (addr+nbytes-1) is not accessible.
EINVAL cache is not one of ICACHE, DCACHE, or BCACHE (but see BUGS).
CONFORMING TO
Historically, this system call was available on all MIPS UNIX variants including RISC/os, IRIX, Ultrix, NetBSD, OpenBSD, and FreeBSD (and
also on some non-UNIX MIPS operating systems), so that the existence of this call in MIPS operating systems is a de-facto standard.
Caveat
cacheflush() should not be used in programs intended to be portable. On Linux, this call first appeared on the MIPS architecture, but
nowadays, Linux provides a cacheflush() system call on some other architectures, but with different arguments.
BUGS
Linux kernels older than version 2.6.11 ignore the addr and nbytes arguments, making this function fairly expensive. Therefore, the whole
cache is always flushed.
This function always behaves as if BCACHE has been passed for the cache argument and does not do any error checking on the cache argument.
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 CACHEFLUSH(2)