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Add libunwind patch from Pyston #6827

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May 13, 2014
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Add libunwind patch from Pyston #6827

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22 changes: 22 additions & 0 deletions deps/0001-Change-the-RBP-validation-heuristic-to-allow-size-0-.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
From e1d7c78d95e4b73a311f10149d0a54547d307d5d Mon Sep 17 00:00:00 2001
From: Kevin Modzelewski <[email protected]>
Date: Tue, 22 Apr 2014 15:50:40 -0700
Subject: [PATCH] Change the RBP-validation heuristic to allow size-0 call frames

---
diff --git a/src/x86_64/Gstep.c b/src/x86_64/Gstep.c
index 9fa0967..809d60b 100644
--- a/src/x86_64/Gstep.c
+++ b/src/x86_64/Gstep.c
@@ -173,7 +173,7 @@ unw_step (unw_cursor_t *cursor)
anything about new RBP (rbp1) since it may not be a frame
pointer in the frame above. Just check we get the value. */
if (ret < 0
- || rbp <= c->dwarf.cfa
+ || rbp < c->dwarf.cfa
|| (rbp - c->dwarf.cfa) > 0x4000)
{
rip_loc = DWARF_NULL_LOC;
--
1.7.4.1

1 change: 1 addition & 0 deletions deps/Makefile
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Expand Up @@ -1303,6 +1303,7 @@ libunwind-$(UNWIND_VER).tar.gz:
$(JLDOWNLOAD) $@ http://download.savannah.gnu.org/releases/libunwind/$@
libunwind-$(UNWIND_VER)/configure: libunwind-$(UNWIND_VER).tar.gz
$(TAR) xfz $<
cd libunwind-$(UNWIND_VER) && patch -p1 < ../0001-Change-the-RBP-validation-heuristic-to-allow-size-0-.patch
touch -c $@
libunwind-$(UNWIND_VER)/config.status: libunwind-$(UNWIND_VER)/configure
cd libunwind-$(UNWIND_VER) && \
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