Interrumpir la dirección con el segread del intdosx de los intdos de las estructuras int86 int86x de la unión BYTEREGS WORDREGS de C SREGS REGS

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Interrupción que dirige con C

C a veces se llama un lenguaje ensamblador de alto nivel porque puede llamar las diversas interrupciones usando algunas de sus algunas funciones definidas. Algunas funciones importantes son como sigue:

  • int86: Invoca interrupciones del MS-DOS.
  • int86x: Invoca la interrupción del MS-DOS con valores del registro del segmento.
  • intdos: invoca servicio del MS-DOS usando los registros con excepción de DX y del AL
  • intdosx: invoca servicio del MS-DOS con valores del registro del segmento.
  • segread: Lee los registros del segmento

Discutiremos estas funciones detalladamente. Primero de todos discutimos alguna estructura y uniones predefinidas que están con frecuencia o utilizaron necesariamente con estas funciones.

Estructura de SREGS

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Esta estructura se ha definido en dos.h y es una estructura de los registros del segmento pasados a y completados por las funciones, int86x, intdosx y segread. El declaración de la estructura es como sigue:

struct SREGS {
unsigned int es;
unsigned int cs;
unsigned int ss;
unsigned int ds;
};

Unión de REGS

REGS es la unión de dos estructuras. La unión REGS ha sido dos.h definido y se utiliza para pasar la información a y desde las funciones, int86, int86x, intdos e intdosx. El declaración de la unión es como sigue:

union REGS {
struct WORDREGS x;
struct BYTEREGS h;

};

Estructuras de BYTEREGS y de WORDREGS

Las estructuras de BYTEREGES y de WORDREGS se han definido en dos.h y éstos se utilizan para almacenar los registros del octeto y de la palabra. La estructura de WORGREGS permite que el usuario tenga acceso a los registros de la CPU como 16 cantidades del pedacito donde la estructura de BYTEREGES da el acceso a los registros del pedacito del individuo 8.

Se declara la estructura de BITEREGS como sigue:

struct BYTEREGS {
unsigned char al, ah, bl, bh;
unsigned char cl, ch, dl, dh;
};

Y se declara la estructura de WORDREGS como sigue:

struct WORDREGS {
unsigned int ax, bx, cx, dx;
unsigned int si, di, cflag, flags;
};

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi, translated using machine translation. See original English contents on Data recovery book pages.

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