PUSHA Instruction

Purpose:

To calculate the address of a quantity

Format:

opcode src.ax

Operation:

-(SP) <- src;

Condition
Codes:

N <- dst LSS 0;
Z <- dst EQL 0;
V <- 0;
C <- C;

Exceptions:

None

Opcodes:

9F	PUSHAB	Push Address Byte
3F	PUSHAW	Push Address Word
DF	PUSHAL	Push Address Long
7F	PUSHAQ	Push Address Quad
DF	PUSHAF	Push Address Float
7F	PUSHAD	Push Address Double

Description:

The source operand, which is an address, is pushed onto the stack as a longword. The context in which the source operand is evaluated is given by the data type of the instruction. The source operand is not referenced. The source operand is unaffected.

Notes:

1.: PUSHAx is equivalent to MOVAx src, -(SP), but is one byte shorter.