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PUSH Push Operand onto Top of Stack
Flags affected:
O D I T S Z A P C OF: Overflow flag TF: Trap flag AF: Aux carry
F F F F F F F F F DF: Direction flag SF: Sign flag PF: Parity flag
<none> IF: Interrupt flag ZF: Zero flag CF: Carry flag
Legal forms:
PUSH r16
PUSH m16
PUSH r32 386+
PUSH m32 386+
PUSH sr
PUSH i8 286+
PUSH i16 286+
PUSH i32 386+
Examples:
PUSH WORD [BX]
PUSH EAX
PUSH DI
PUSH ES
PUSH DWORD 5
PUSH WORD 1000H
Notes:
It is impossible to push an 8-bit item onto the stack. Also remember that the top of the stack is defined (in 16-bit modes) as the word at address SS:SP, and there's no way to override that using prefixes. In 32-bit modes the top of the stack is the DWORD at [ESP]. There is a separate pair of instructions, PUSHF and POPF, for pushing and popping the Flags register.Also remember that SP/ESP is decremented before the push takes place; SP points to either an empty stack or else real data.
r8 = AL AH BL BH CL CH DL DH r16 = AX BX CX DX BP SP SI DI
sr = CS DS SS ES FS GS r32 = EAX EBX ECX EDX EBP ESP ESI EDI
m8 = 8-bit memory data m16 = 16-bit memory data
m32 = 32-bit memory data i8 = 8-bit immediate data
i16 = 16-bit immediate data i32 = 32-bit immediate data
d8 = 8-bit signed displacement d16 = 16-bit signed displacement
d32 = 32-bit unsigned displacement
