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.text
.globl _switchStackInternal
_switchStackInternal:
// save callee-saved registers
push %rbp
movq %rsp, %rbp
push %rbx
push %r12
push %r13
push %r14
push %r15
// store SIMD floating point control word
sub $4, %rsp
stmxcsr (%rsp)
// store floating point control bytes
sub $4, %rsp
fstcw (%rsp)
// save the old stack pointer (second arg in rsi)
movq %rsp, (%rsi)
// set the new stack pointer (first arg in rdi)
movq %rdi, %rsp
// restore floating point control bytes
fnclex
fldcw (%rsp)
add $4, %rsp
// restore SIMD floating point control word
ldmxcsr (%rsp)
add $4, %rsp
// pop callee-saved registers
pop %r15
pop %r14
pop %r13
pop %r12
pop %rbx
pop %rbp
retq
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