From 992556847350e1f467216fa2385347c21c3f70b3 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sat, 11 Oct 2014 12:59:39 +0800
Subject: [PATCH] devices/runtime: add returns_twice attribute on __eh_setjmp
 (fixes exception crashes)

---
 artiq/devices/runtime.py                             |  1 +
 .../llvmpy/0002-add-returns-twice-attribute.patch    | 12 ++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 patches/llvmpy/0002-add-returns-twice-attribute.patch

diff --git a/artiq/devices/runtime.py b/artiq/devices/runtime.py
index 3a5d87f84..d9bac42ce 100644
--- a/artiq/devices/runtime.py
+++ b/artiq/devices/runtime.py
@@ -65,6 +65,7 @@ class LinkInterface:
         func_type = lc.Type.function(lc.Type.int(), [lc.Type.pointer(lc.Type.int(8))])
         function = self.llvm_module.add_function(func_type, "__eh_setjmp")
         function.add_attribute(lc.ATTR_NO_UNWIND)
+        function.add_attribute(lc.ATTR_RETURNS_TWICE)
 
         func_type = lc.Type.function(lc.Type.pointer(lc.Type.int(8)), [])
         self.llvm_module.add_function(func_type, "__eh_push")
diff --git a/patches/llvmpy/0002-add-returns-twice-attribute.patch b/patches/llvmpy/0002-add-returns-twice-attribute.patch
new file mode 100644
index 000000000..20a9e0d77
--- /dev/null
+++ b/patches/llvmpy/0002-add-returns-twice-attribute.patch
@@ -0,0 +1,12 @@
+diff --git a/llvm/core.py b/llvm/core.py
+index 20ad062..245ac65 100644
+--- a/llvm/core.py
++++ b/llvm/core.py
+@@ -379,6 +379,7 @@ class AttrEnum(Enum):
+     ATTR_NAKED              = AttrVal.Naked
+     ATTR_INLINE_HINT        = AttrVal.InlineHint
+     ATTR_STACK_ALIGNMENT    = AttrVal.StackAlignment
++    ATTR_RETURNS_TWICE      = AttrVal.ReturnsTwice
+ 
+ AttrEnum.declare()
+