1 files changed, 41 insertions, 0 deletions
diff --git a/src/backend/switchstack_gcc_32_linux_mac.s b/src/backend/switchstack_gcc_32_linux_mac.s
new file mode 100644
index 0000000..e4eac63
--- /dev/null
+++ b/src/backend/switchstack_gcc_32_linux_mac.s
@@ -0,0 +1,41 @@
+.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