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PUSHA

Pushes all 32-bit general-purpose registers onto the stack. The registers are pushed in a specific order (EBP, EDI, ESI, ESP, EBP, EBX, EDX, ECX, EAX), decrementing the stack pointer after each push.

The following table covers what the source and destinations can be.

DO NOT support LOCK

This instruction is ONLY available in compatibility mode. In 64-bit mode, PUSHA is not supported and will trigger an invalid opcode exception.

The instruction implicitly uses the ESP register to determine the destination memory address. The stack MUST be aligned to a 4-byte boundary to avoid alignment check exceptions if alignment checking is enabled. Because this instruction modifies the stack pointer (ESP) multiple times, any interrupt or exception occurring during execution MUST ensure the stack state is consistent.