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.model flat, c
.code
_switchStackInternal PROC to:QWORD, from:QWORD
; save callee-saved registers
PUSH RBP
MOV RBP, RSP
PUSH RBX
PUSH ESI
PUSH EDI
PUSH R12
PUSH R13
PUSH R14
PUSH R15
PUSH RSI
PUSH RDI
SUB RSP, 0x10
MOVUPD [RSP], XMM6
SUB RSP, 0x10
MOVUPD [RSP], XMM7
SUB RSP, 0x10
MOVUPD [RSP], XMM8
SUB RSP, 0x10
MOVUPD [RSP], XMM9
SUB RSP, 0x10
MOVUPD [RSP], XMM10
SUB RSP, 0x10
MOVUPD [RSP], XMM11
SUB RSP, 0x10
MOVUPD [RSP], XMM12
SUB RSP, 0x10
MOVUPD [RSP], XMM13
SUB RSP, 0x10
MOVUPD [RSP], XMM14
SUB RSP, 0x10
MOVUPD [RSP], XMM15
; store SIMD floating point control word
SUB RSP, 4
STMXCSR [RSP]
; store floating point control bytes
SUB RSP, 4
FSTCW [RSP]
; save the old stack pointer
MOV [from], RSP
; set the new stack pointer
MOV RSP, to
; restore floating point control bytes
FNCLEX
FLDCW [RSP]
ADD RSP, 4
; restore SIMD floating point control word
LDMXCSR [RSP]
ADD RSP, 4
; pop callee-saved registers
MOVUPD XMM15, [RSP]
ADD RSP, 0x10
MOVUPD XMM14, [RSP]
ADD RSP, 0x10
MOVUPD XMM13, [RSP]
ADD RSP, 0x10
MOVUPD XMM12, [RSP]
ADD RSP, 0x10
MOVUPD XMM11, [RSP]
ADD RSP, 0x10
MOVUPD XMM10, [RSP]
ADD RSP, 0x10
MOVUPD XMM9, [RSP]
ADD RSP, 0x10
MOVUPD XMM8, [RSP]
ADD RSP, 0x10
MOVUPD XMM7, [RSP]
ADD RSP, 0x10
MOVUPD XMM6, [RSP]
ADD RSP, 0x10
POP RDI
POP RSI
POP R15
POP R14
POP R13
POP R12
POP RBX
POP RBP
RET
_switchStackInternal ENDP
end
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