1 files changed, 93 insertions, 0 deletions
diff --git a/library/fibers/switchstack_gcc_64_win.s b/library/fibers/switchstack_gcc_64_win.s
new file mode 100644
index 0000000..f75c53c
--- /dev/null
+++ b/library/fibers/switchstack_gcc_64_win.s
@@ -0,0 +1,93 @@
+.global _switchStackInternal
+.section .text 
+.def _switchStackInternal ; .scl 2 ; .type 32 ; .endef 
+
+_switchStackInternal:
+    // save callee-saved registers
+    push %rbp
+    movq %rsp, %rbp
+    push %rbx
+    push %r12
+    push %r13
+    push %r14
+    push %r15
+
+    push %rsi
+    push %rdi
+
+    sub $0x10, %rsp
+    movupd %xmm6, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm7, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm8, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm9, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm10, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm11, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm12, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm13, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm14, (%rsp)
+    sub $0x10, %rsp
+    movupd %xmm15, (%rsp)
+
+    // 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
+    movupd (%rsp), %xmm15
+    add $0x10, %rsp
+    movupd (%rsp), %xmm14
+    add $0x10, %rsp
+    movupd (%rsp), %xmm13
+    add $0x10, %rsp
+    movupd (%rsp), %xmm12
+    add $0x10, %rsp
+    movupd (%rsp), %xmm11
+    add $0x10, %rsp
+    movupd (%rsp), %xmm10
+    add $0x10, %rsp
+    movupd (%rsp), %xmm9
+    add $0x10, %rsp
+    movupd (%rsp), %xmm8
+    add $0x10, %rsp
+    movupd (%rsp), %xmm7
+    add $0x10, %rsp
+    movupd (%rsp), %xmm6
+    add $0x10, %rsp
+
+    pop %rdi
+    pop %rsi
+
+    pop %r15
+    pop %r14
+    pop %r13
+    pop %r12
+    pop %rbx
+    pop %rbp
+
+    retq