+#ifdef LISP_FEATURE_WIN32
+ /* The guts of the exception-handling system doesn't use
+ * frame pointers, which manages to throw off backtraces
+ * rather badly. So here we grab the (known-good) EBP
+ * and EIP from the exception context and use it to fake
+ * up a stack frame which will skip over the system SEH
+ * code. */
+ .align align_4byte
+ .globl GNAME(exception_handler_wrapper)
+ TYPE(GNAME(exception_handler_wrapper))
+GNAME(exception_handler_wrapper):
+ /* Context layout is: */
+ /* 7 dwords before FSA. (0x1c) */
+ /* 8 dwords and 0x50 bytes in the FSA. (0x70/0x8c) */
+ /* 4 dwords segregs. (0x10/0x9c) */
+ /* 6 dwords non-stack GPRs. (0x18/0xb4) */
+ /* EBP (at 0xb4) */
+ /* EIP (at 0xb8) */
+#define CONTEXT_EBP_OFFSET 0xb4
+#define CONTEXT_EIP_OFFSET 0xb8
+ /* some other stuff we don't care about. */
+ pushl %ebp
+ movl 0x10(%esp), %ebp /* context */
+ pushl CONTEXT_EIP_OFFSET(%ebp)
+ pushl CONTEXT_EBP_OFFSET(%ebp)
+ movl %esp, %ebp
+ pushl 0x1c(%esp)
+ pushl 0x1c(%esp)
+ pushl 0x1c(%esp)
+ pushl 0x1c(%esp)
+ call GNAME(handle_exception)
+ lea 8(%ebp), %esp
+ popl %ebp
+ ret
+ SIZE(GNAME(exception_handler_wrapper))
+#endif
+