As the title suggests, I want to better understand the following assembly code:
As you can see I already have descriptions in the comments from the tutorial I found here. Here are some of the things I don't understand:
1. - What is s2? Is this just a variable or a register I know nothing about?
2. When '1' is moved into ebx, is this a parameter to the sys_exit later called in eax? I found a listing of Linux syscalls here and it does seem sys_exit does take one parameter in ebx that's an integer. If this is the case why not exit cleanly with zero?
I just want to make sure I understand everything correctly in this. Thanks in advance!
Hello All,
I would like to know and understand the difference between the below 3 IF loops and also if possible what are the different other parameters i could use other than those mentioed in the below lF LOOP conditions, appreciate your help.
Thanks,
Sam. (1 Reply)
hello all,
May i know what is this "DEBUG_ME $DEBUG_CMD main" doing in the below code. I am confused with alias also "alias DEBUG_ME='#'". Thanks for your help.
set -x
alias DEBUG_ME='#'
if ; then
. /product/apps/informatica/v7/pc/ExtProc/debug.ksh "$1"
fi
# Declaring the... (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)
Well, I found myself trying to fix some Perl code (Ive never done any Perl in my life) and I pinpointed the place where the bug could be. But to be sure I have to know what does a few line of code mean:
$files_lim =~ (/^\d*$/)
$files_lim =~ (/^\d*h$/)$files_age =~ s/h//The code where this was... (0 Replies)
Well, I found myself trying to fix some Perl code (Ive never done any Perl in my life) and I pinpointed the place where the bug could be. But to be sure I have to know what does a few line of code mean:
$files_lim =~ (/^\d*$/)
$files_lim =~ (/^\d*h$/)
$files_age =~ s/h//
The code where... (2 Replies)
What is the difference between the two statements below?
A:
$a->{"$fruit"}->{"$color"}->{size} = $size
B:
$size = $a->{"$fruit"}->{"$color"}->{size}
Please assist. Thanks! (0 Replies)
Hi everybody
I'm working on a list of registers(flip-flops to be exact), now i need to extract some value from this list and use them as arguments to pass them to some assembly code
for example i have:
118 chain79 MASTER (FF-LE) FFFF 1975829 /TCK F FD1TQHVTT1 ... (1 Reply)
Hi,
I need to understand below perl code, can some one advise me.
perl -MDate::Parse -e'BEGIN{$main::now=time;$main::old=(time-60*30)}' -nE'if(/^(\w+\s+\d+\s+\d+:\d+:\d+)/) {$t=str2time $1; $t > $old && $t < $now && print}' (1 Reply)
Hi guys,
I am still learning awk and much apprecated to shed some light on the following: the questions asked is below!
{
total = i = 0
do {
++i
total += $i
} while ( total <= 100 )
print i, ":", total
}
File used:
cat test.do
45 25 60 20
10 105 50 40
33 5 9 67
108 3 5 4 (2 Replies)
Discussion started by: Apollo
2 Replies
LEARN ABOUT V7
intro
INTRO(3) Library Functions Manual INTRO(3)NAME
intro - introduction to library functions
SYNOPSIS
#include <stdio.h>
#include <math.h>
DESCRIPTION
This section describes functions that may be found in various libraries, other than those functions that directly invoke UNIX system primi-
tives, which are described in section 2. Functions are divided into various libraries distinguished by the section number at the top of
the page:
(3) These functions, together with those of section 2 and those marked (3S), constitute library libc, which is automatically loaded by
the C compiler cc(1) and the Fortran compiler f77(1). The link editor ld(1) searches this library under the `-lc' option. Declara-
tions for some of these functions may be obtained from include files indicated on the appropriate pages.
(3M) These functions constitute the math library, libm. They are automatically loaded as needed by the Fortran compiler f77(1). The link
editor searches this library under the `-lm' option. Declarations for these functions may be obtained from the include file
<math.h>.
(3S) These functions constitute the `standard I/O package', see stdio(3). These functions are in the library libc already mentioned.
Declarations for these functions may be obtained from the include file <stdio.h>.
(3X) Various specialized libraries have not been given distinctive captions. The files in which these libraries are found are named on
the appropriate pages.
FILES
/lib/libc.a
/lib/libm.a, /usr/lib/libm.a (one or the other)
SEE ALSO stdio(3), nm(1), ld(1), cc(1), f77(1), intro(2)DIAGNOSTICS
Functions in the math library (3M) may return conventional values when the function is undefined for the given arguments or when the value
is not representable. In these cases the external variable errno (see intro(2)) is set to the value EDOM or ERANGE. The values of EDOM
and ERANGE are defined in the include file <math.h>.
ASSEMBLER
In assembly language these functions may be accessed by simulating the C calling sequence. For example, ecvt(3) might be called this way:
setd
mov $sign,-(sp)
mov $decpt,-(sp)
mov ndigit,-(sp)
movf value,-(sp)
jsr pc,_ecvt
add $14.,sp
INTRO(3)