Initial port of Libunwind to Unikraft

This is our initial port of libunwind to Unikraft as an external
library. Libc, or an equivalent, is required for it to work.

The dependency list in the  Makefile should be:
...:$(UK_LIBS)/libunwind:$(UK_LIBS)/compiler-rt:
$(UK_LIBS)/libcxxabi:$(UK_LIBS)/libcxx:$(UK_LIBS)/newlib:...

Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
Reviewed-by: Felipe Huici <felipe.huici@neclab.eu>

diff --git a/CODING_STYLE.md b/CODING_STYLE.md
new file mode 100644 (file)
index 0000000..5730041
--- /dev/null
+++ b/CODING_STYLE.md
@@ -0,0 +1,4 @@
+Coding Style
+============
+
+Please refer to the `CODING_STYLE.md` file in the main Unikraft repository.

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644 (file)
index 0000000..5f55eca
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,4 @@
+Contributing to Unikraft
+=======================
+
+Please refer to the `CONTRIBUTING.md` file in the main Unikraft repository.

diff --git a/Config.uk b/Config.uk
new file mode 100644 (file)
index 0000000..9f78aee
--- /dev/null
+++ b/Config.uk
@@ -0,0 +1,6 @@
+menuconfig LIBUNWIND
+    bool "libunwind - unwinder"
+       select LIBNOLIBC if !HAVE_LIBC
+       select LIBCOMPILER_RT
+       depends on !PLAT_LINUXU
+    default n

diff --git a/MAINTAINERS.md b/MAINTAINERS.md
new file mode 100644 (file)
index 0000000..e2aa947
--- /dev/null
+++ b/MAINTAINERS.md
@@ -0,0 +1,11 @@
+Maintainers List
+================
+
+For notes on how to read this information, please refer to `MAINTAINERS.md` in
+the main Unikraft repository.
+
+       NEWLIB-UNIKRAFT
+       M:      Felipe Huici <felipe.huici@neclab.eu>
+       M:      Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
+       L:      minios-devel@lists.xen.org
+       F: *

diff --git a/Makefile.uk b/Makefile.uk
new file mode 100644 (file)
index 0000000..a80a4fe
--- /dev/null
+++ b/Makefile.uk
@@ -0,0 +1,92 @@
+#  libunwind Makefile.uk
+#
+#  Authors: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
+#
+#  Copyright (c) 2019, Politehnica University of Bucharest. All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions
+#  are met:
+#
+#  1. Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+#  2. Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#  3. Neither the name of the copyright holder nor the names of its
+#     contributors may be used to endorse or promote products derived from
+#     this software without specific prior written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+#  POSSIBILITY OF SUCH DAMAGE.
+#
+#  THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+#
+
+
+################################################################################
+# Library registration
+################################################################################
+$(eval $(call addlib_s,libunwind,$(CONFIG_LIBUNWIND)))
+
+ifeq ($(CONFIG_LIBUNWIND),y)
+ifneq ($(CONFIG_LIBCOMPILER_RT),y)
+$(error Require libcompiler_rt)
+endif
+ifeq ($(CONFIG_PLAT_LINUXU), y)
+$(error Libunwind not supported on Linuxu)
+endif
+endif
+
+################################################################################
+# Sources
+################################################################################
+LIBUNWIND_VERSION=7.0.0
+LIBUNWIND_URL=http://releases.llvm.org/$(LIBUNWIND_VERSION)/libunwind-$(LIBUNWIND_VERSION).src.tar.xz
+LIBUNWIND_PATCHDIR=$(LIBUNWIND_BASE)/patches
+$(eval $(call fetch,libunwind,$(LIBUNWIND_URL)))
+$(eval $(call patch,libunwind,$(LIBUNWIND_PATCHDIR),libunwind-$(LIBUNWIND_VERSION).src))
+
+################################################################################
+# Helpers
+################################################################################
+LIBUNWIND_SUBDIR=libunwind-$(LIBUNWIND_VERSION).src
+LIBUNWIND_SRC=$(LIBUNWIND_ORIGIN)/$(LIBUNWIND_SUBDIR)
+
+################################################################################
+# Library includes
+################################################################################
+CINCLUDES-$(CONFIG_LIBUNWIND) += -I$(LIBUNWIND_SRC)/src
+CINCLUDES-$(CONFIG_LIBUNWIND) += -I$(LIBUNWIND_SRC)/include
+CXXINCLUDES-$(CONFIG_LIBUNWIND) += -I$(LIBUNWIND_SRC)/src
+CXXINCLUDES-$(CONFIG_LIBUNWIND) += -I$(LIBUNWIND_SRC)/include
+
+################################################################################
+# Global flags
+################################################################################
+CONFIG_FLAGS   += -D _LIBUNWIND_HAS_NO_THREADS  -D __ELF__  -D _LIBUNWIND_IS_NATIVE_ONLY               \
+                 -D _LIBUNWIND_SUPPORT_DWARF_UNWIND -D _LIBUNWIND_IS_BAREMETAL                         \
+                 -D _LIBUNWIND_BUILD_ZERO_COST_APIS -D _LIBUNWIND_TARGET_X86_64 -D __x86_64__
+
+LIBUNWIND_CFLAGS-y      +=  $(CONFIG_FLAGS)
+LIBUNWIND_CXXFLAGS-y    +=  $(CONFIG_FLAGS)
+
+################################################################################
+# Library sources
+################################################################################
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/UnwindLevel1.c
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/Unwind-sjlj.c
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/UnwindLevel1-gcc-ext.c
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/libunwind.cpp
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/Unwind-EHABI.cpp
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/UnwindRegistersRestore.S
+LIBUNWIND_SRCS-y += $(LIBUNWIND_SRC)/src/UnwindRegistersSave.S

diff --git a/README.md b/README.md
new file mode 100644 (file)
index 0000000..ab369e6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,5 @@
+libunwind for Unikraft
+===================
+
+Please refer to the `README.md` as well as the documentation in the `doc/`
+subdirectory of the main unikraft repository.

diff --git a/exportsyms.uk b/exportsyms.uk
new file mode 100644 (file)
index 0000000..1b7cf1e
--- /dev/null
+++ b/exportsyms.uk
@@ -0,0 +1,33 @@
+_Unwind_Backtrace
+_Unwind_DeleteException
+_Unwind_FindEnclosingFunction
+_Unwind_Find_FDE
+_Unwind_ForcedUnwind
+_Unwind_GetCFA
+_Unwind_GetDataRelBase
+_Unwind_GetGR
+_Unwind_GetIP
+_Unwind_GetIPInfo
+_Unwind_GetLanguageSpecificData
+_Unwind_GetRegionStart
+_Unwind_GetTextRelBase
+_Unwind_RaiseException
+_Unwind_Resume
+_Unwind_Resume_or_Rethrow
+_Unwind_SetGR
+_Unwind_SetIP
+unw_getcontext
+unw_get_fpreg
+unw_get_proc_info
+unw_get_proc_name
+unw_get_reg
+unw_init_local
+unw_is_fpreg
+unw_is_signal_frame
+unw_iterate_dwarf_unwind_cache
+unw_local_addr_space
+unw_regname
+unw_resume
+unw_set_fpreg
+unw_set_reg
+unw_step

diff --git a/patches/0001-Updated-the-RIP.patch b/patches/0001-Updated-the-RIP.patch
new file mode 100644 (file)
index 0000000..dcbdfcd
--- /dev/null
+++ b/patches/0001-Updated-the-RIP.patch
@@ -0,0 +1,37 @@
+From 863cddb4f2f89b51b38785f49b6c7cf3fc9e3f2c Mon Sep 17 00:00:00 2001
+From: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
+Date: Mon, 3 Dec 2018 18:59:59 +0200
+Subject: [PATCH] Updated the RIP
+
+This patch changes the RIP that is saved
+by the unw_getcontext function. Now the
+RIP is pointing to the throw that has
+triggered the exception.
+
+Signed-off-by: Vlad-Andrei Badoiu <vlad_andrei.badoiu@stud.acs.upb.ro>
+---
+ UnwindRegistersSave.S | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/UnwindRegistersSave.S b/UnwindRegistersSave.S
+index 07db14b..8223ea1 100644
+--- a/src/UnwindRegistersSave.S
++++ b/src/UnwindRegistersSave.S
+@@ -88,7 +88,13 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+   movq  %r13,104(PTR)
+   movq  %r14,112(PTR)
+   movq  %r15,120(PTR)
+-  movq  (%rsp),TMP
++  push %rax 
++  movq %rbp, (%rax)
++  movq (%rax), %rax
++  addq $8, %rax
++  movq (%rax), %rax
++  movq  %rax, TMP
++  pop %rax 
+   movq  TMP,128(PTR) # store return address as rip
+   # skip rflags
+   # skip cs
+-- 
+2.19.2
+