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.text
.globl _switchStackInternal
_switchStackInternal:
// save callee-saved registers
push %ebp
movl %esp, %ebp
push %ebx
push %esi
push %edi
// store SIMD floating point control word
sub $4, %esp
stmxcsr (%esp)
// store floating point control bytes
sub $4, %esp
fstcw (%esp)
// save the old stack pointer
movl 0xc(%ebp), %edx
movl %esp, (%edx)
// set the new stack pointer
movl 0x8(%ebp), %esp
// restore floating point control bytes
fnclex
fldcw (%esp)
add $4, %esp
// restore SIMD floating point control word
ldmxcsr (%esp)
add $4, %esp
// pop callee-saved registers
pop %edi
pop %esi
pop %ebx
pop %ebp
ret
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