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AMD64 Technology 24594 Rev. 3.10 February 2005PUSHPush onto StackDecrements the stack pointer and then copies the specified immediate value or thevalue in the specified register or memory location to the top of the stack (the memorylocation pointed to by SS:rSP).The operand-size attribute determines the number of bytes pushed to the stack. Thestack-size attribute determines whether SP, ESP, or RSP is the stack pointer. Theaddress-size attribute is used only to locate the memory operand when pushing amemory operand to the stack.If the instruction pushes the stack pointer (rSP), the resulting value on the stack isthat of rSP before execution of the instruction.There is a PUSH CS instruction but no corresponding POP CS. The RET (Far)instruction pops a value from the top of stack into the CS register as part of itsoperation.In 64-bit mode, the operand size of all PUSH instructions defaults to 64 bits, and thereis no prefix available to encode a 32-bit operand size. Using the PUSH CS, PUSH DS,PUSH ES, or PUSH SS instructions in 64-bit mode generates an invalid-opcodeexception.Pushing an odd number of 16-bit operands when the stack address-size attribute is 32results in a misaligned stack pointer.Mnemonic Opcode DescriptionPUSH reg/mem16 FF /6PUSH reg/mem32 FF /6PUSH reg/mem64 FF /6Push the contents of a 16-bit register or memory operand ontothe stack.Push the contents of a 32-bit register or memory operand ontothe stack. (No prefix for encoding this in 64-bit mode.)Push the contents of a 64-bit register or memory operand ontothe stack.PUSH reg16 50 +rw Push the contents of a 16-bit register onto the stack.PUSH reg3250 +rdPush the contents of a 32-bit register onto the stack. (No prefixfor encoding this in 64-bit mode.)PUSH reg64 50 +rq Push the contents of a 64-bit register onto the stack.PUSH imm86APush an 8-bit immediate value (sign-extended to 16, 32, or 64bits) onto the stack.234 PUSH
24594 Rev. 3.10 February 2005 AMD64 TechnologyMnemonic Opcode DescriptionPUSH imm16 68 Push a 16-bit immediate value onto the stack.PUSH imm32 68Push a 32-bit immediate value onto the stack. (No prefix forencoding this in 64-bit mode.)PUSH imm64 68 Push a sign-extended 32-bit immediate value onto the stack.PUSH CS 0E Push the CS selector onto the stack. (Invalid in 64-bit mode.)PUSH SS 16 Push the SS selector onto the stack. (Invalid in 64-bit mode.)PUSH DS 1E Push the DS selector onto the stack. (Invalid in 64-bit mode.)PUSH ES 06 Push the ES selector onto the stack. (Invalid in 64-bit mode.)PUSH FS 0F A0 Push the FS selector onto the stack.PUSH GS 0F A8 Push the GS selector onto the stack.Related InstructionsPOPrFLAGS AffectedNoneExceptionsException RealVirtual8086 Protected Cause of ExceptionInvalid opcode, #UD X PUSH CS, PUSH DS, PUSH ES, or PUSH SS was executed in 64-bitmode.Stack, #SS X X X A memory address exceeded the stack segment limit or was noncanonical.General protection,#GPX X XA memory address exceeded a data segment limit or was non-canonical.X A null data segment was used to reference memory.Page fault, #PF X X A page fault resulted from the execution of the instruction.Alignment check, #AC X X An unaligned memory reference was performed while alignmentchecking was enabled.PUSH 235
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