From 50b040ef83252730d75463bdeea589294e698532 Mon Sep 17 00:00:00 2001
From: grischka <grischka>
Date: Sat, 19 Dec 2009 22:40:28 +0100
Subject: win64: add tiny unwind data for setjmp/longjmp

This enables native unwind semantics with longjmp on
win64 by putting an entry into the .pdata section for
each compiled fuction.

Also, the function now use a fixed stack and store arguments
into X(%rsp) rather than using push.
---
 win32/lib/chkstk.S | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'win32/lib/chkstk.S')

diff --git a/win32/lib/chkstk.S b/win32/lib/chkstk.S
index 90a6f0d..a757b16 100644
--- a/win32/lib/chkstk.S
+++ b/win32/lib/chkstk.S
@@ -57,11 +57,19 @@ P0:
     jmp     *8(%rax)
 
 /* ---------------------------------------------- */
-/* avoid msvcrt unwind stuff for setjmp/longjmp */
+/* setjmp/longjmp support */
 
-.globl tinyc_getsp
-tinyc_getsp:
+.globl tinyc_no_getbp
+tinyc_no_getbp:
+    .byte 0x90
+
+.globl tinyc_getbp
+tinyc_getbp:
     xor %rax,%rax
+    cmp %al,tinyc_no_getbp(%rax)
+    je t1
+    mov %rbp,%rax
+t1:
     ret
 
 /* ---------------------------------------------- */
-- 
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