llvm-libunwind: Add recipe

Apple has contributed libunwind implementation to llvm which is needed
for libcxx to work and is equivalent in APIs to HP's libunwind implementation
from good old days

Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 112 insertions, 0 deletions

diff --git a/recipes-devtools/clang/llvm-libunwind/0001-aarch64-Use-x29-and-x30-for-fp-and-lr-respectively.patch b/recipes-devtools/clang/llvm-libunwind/0001-aarch64-Use-x29-and-x30-for-fp-and-lr-respectively.patch
new file mode 100644
index 0000000..0c65dba
--- /dev/null
+++ b/recipes-devtools/clang/llvm-libunwind/0001-aarch64-Use-x29-and-x30-for-fp-and-lr-respectively.patch
@@ -0,0 +1,65 @@
+From 5def58395d2248dfcd3165b4f23ba04b7f355837 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Thu, 10 Sep 2015 21:27:28 +0000
+Subject: [PATCH] aarch64: Use x29 and x30 for fp and lr respectively
+
+This does not change the code generation with integrated asm
+but using x30 and x29 helps compile the code with gnu as. Currently gas
+fails to assemble this code with errors as below
+
+Error: operand X should be an integer register
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Submitted[http://reviews.llvm.org/D12777]
+
+ src/UnwindRegistersRestore.S | 6 +++---
+ src/UnwindRegistersSave.S    | 6 +++---
+ 2 files changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/src/UnwindRegistersRestore.S b/src/UnwindRegistersRestore.S
+index 7d21953..1244d82 100644
+--- a/src/UnwindRegistersRestore.S
++++ b/src/UnwindRegistersRestore.S
+@@ -282,8 +282,8 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_arm646jumptoEv)
+   ldp    x22,x23, [x0, #0x0B0]
+   ldp    x24,x25, [x0, #0x0C0]
+   ldp    x26,x27, [x0, #0x0D0]
+-  ldp    x28,fp,  [x0, #0x0E0]
+-  ldr    lr,      [x0, #0x100]  // restore pc into lr
++  ldp    x28,x29, [x0, #0x0E0]
++  ldr    x30,     [x0, #0x100]  // restore pc into lr
+   ldr    x1,      [x0, #0x0F8]
+   mov    sp,x1                  // restore sp
+ 
+@@ -306,7 +306,7 @@ DEFINE_LIBUNWIND_PRIVATE_FUNCTION(_ZN9libunwind15Registers_arm646jumptoEv)
+   ldr    d31,     [x0, #0x208]
+ 
+   ldp    x0, x1,  [x0, #0x000]  // restore x0,x1
+-  ret    lr                     // jump to pc
++  ret    x30                    // jump to pc
+ 
+ #elif defined(__arm__) && !defined(__APPLE__)
+ 
+diff --git a/src/UnwindRegistersSave.S b/src/UnwindRegistersSave.S
+index d26908c..80776c8 100644
+--- a/src/UnwindRegistersSave.S
++++ b/src/UnwindRegistersSave.S
+@@ -254,11 +254,11 @@ DEFINE_LIBUNWIND_FUNCTION(unw_getcontext)
+   stp    x22,x23, [x0, #0x0B0]
+   stp    x24,x25, [x0, #0x0C0]
+   stp    x26,x27, [x0, #0x0D0]
+-  stp    x28,fp,  [x0, #0x0E0]
+-  str    lr,      [x0, #0x0F0]
++  stp    x28,x29, [x0, #0x0E0]
++  str    x30,     [x0, #0x0F0]
+   mov    x1,sp
+   str    x1,      [x0, #0x0F8]
+-  str    lr,      [x0, #0x100]    // store return address as pc
++  str    x30,     [x0, #0x100]    // store return address as pc
+   // skip cpsr
+   stp    d0, d1,  [x0, #0x110]
+   stp    d2, d3,  [x0, #0x120]
+-- 
+2.5.1
+
diff --git a/recipes-devtools/clang/llvm-libunwind_git.bb b/recipes-devtools/clang/llvm-libunwind_git.bb
new file mode 100644
index 0000000..4e77dce
--- /dev/null
+++ b/recipes-devtools/clang/llvm-libunwind_git.bb
@@ -0,0 +1,47 @@
+# Copyright (C) 2015 Khem Raj <raj.khem@gmail.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+DESCRIPTION = "libunwind implements a stack unwinder, needed to perform C++ exception handling."
+HOMEPAGE = "http://llvm.org/"
+LICENSE = "MIT & UIUC"
+SECTION = "base"
+INHIBIT_DEFAULT_DEPS = "1"
+
+DEPENDS += "clang-cross-${TARGET_ARCH}"
+
+require clang.inc
+
+inherit cmake
+
+DEPENDS += "libcxx"
+LIC_FILES_CHKSUM = "file://../libcxx/LICENSE.TXT;md5=149d2e8e8d99e3a2d702997b5f919fd9; \
+                   "
+SRCREV_libunwind = "1d9ef03c3ee017838437e0f3197f2912eebdce5a"
+SRC_URI = "\
+           git://github.com/llvm-mirror/llvm.git;branch=${BRANCH};name=llvm \
+           git://github.com/llvm-mirror/libcxx.git;branch=${BRANCH};name=libcxx;destsuffix=git/projects/libcxx \
+           git://github.com/llvm-mirror/libcxxabi.git;branch=${BRANCH};name=libcxxabi;destsuffix=git/projects/libcxxabi \
+           git://github.com/llvm-mirror/libunwind.git;branch=master;name=libunwind;destsuffix=git/projects/libunwind \
+           file://0001-aarch64-Use-x29-and-x30-for-fp-and-lr-respectively.patch \
+          "
+
+SRCREV_FORMAT = "llvm_libcxx_libcxxabi_libunwind"
+
+S = "${WORKDIR}/git/projects/libunwind"
+
+THUMB_TUNE_CCARGS = ""
+TUNE_CCARGS += "-ffreestanding -nostdlib"
+
+EXTRA_OECMAKE += "-DLIBCXXABI_LIBCXX_PATH=${S}/../libcxxabi \
+                  -DLLVM_PATH=${S}/../../ \
+                  -DLLVM_ENABLE_LIBCXX=True \
+                  -DLLVM_ENABLE_LIBCXXABI=True \
+                  -DLLVM_BUILD_EXTERNAL_COMPILER_RT=True \
+                  -DLIBCXXABI_ENABLE_SHARED=False \
+                  -DUNIX=True \
+                  -DLIBUNWIND_ENABLE_SHARED=False \
+                 "
+do_configure_prepend () {
+        (cd ${S}/include && ln -sf ../../libcxxabi/include/__cxxabi_config.h)
+}
+BBCLASSEXTEND = "native nativesdk"