1 files changed, 53 insertions, 0 deletions
diff --git a/contrib/llvm/patches/patch-07-clang-r227062-fixes-x18.diff b/contrib/llvm/patches/patch-07-clang-r227062-fixes-x18.diff
new file mode 100644
index 0000000..9316f5d
--- /dev/null
+++ b/contrib/llvm/patches/patch-07-clang-r227062-fixes-x18.diff
@@ -0,0 +1,53 @@
+Pull in r227062 from upstream clang trunk (by Renato Golin):
+
+  Allows Clang to use LLVM's fixes-x18 option
+
+  This patch allows clang to have llvm reserve the x18
+  platform register on AArch64. FreeBSD will use this in the kernel for
+  per-cpu data but has no need to reserve this register in userland so
+  will need this flag to reserve it.
+
+  This uses llvm r226664 to allow this register to be reserved.
+
+  Patch by Andrew Turner.
+
+Introduced here: http://svnweb.freebsd.org/changeset/base/277775
+
+Index: tools/clang/include/clang/Driver/Options.td
+===================================================================
+--- tools/clang/include/clang/Driver/Options.td
++++ tools/clang/include/clang/Driver/Options.td
+@@ -1209,6 +1209,8 @@ def mfix_cortex_a53_835769 : Flag<["-"], "mfix-cor
+ def mno_fix_cortex_a53_835769 : Flag<["-"], "mno-fix-cortex-a53-835769">,
+   Group<m_aarch64_Features_Group>,
+   HelpText<"Don't workaround Cortex-A53 erratum 835769 (AArch64 only)">;
++def ffixed_x18 : Flag<["-"], "ffixed-x18">, Group<m_aarch64_Features_Group>,
++  HelpText<"Reserve the x18 register (AArch64 only)">;
+ 
+ def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
+ def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
+Index: tools/clang/lib/Driver/Tools.cpp
+===================================================================
+--- tools/clang/lib/Driver/Tools.cpp
++++ tools/clang/lib/Driver/Tools.cpp
+@@ -958,6 +958,11 @@ void Clang::AddAArch64TargetArgs(const ArgList &Ar
+     if (A->getOption().matches(options::OPT_mno_global_merge))
+       CmdArgs.push_back("-mno-global-merge");
+   }
++
++  if (Args.hasArg(options::OPT_ffixed_x18)) {
++    CmdArgs.push_back("-backend-option");
++    CmdArgs.push_back("-aarch64-reserve-x18");
++  }
+ }
+ 
+ // Get CPU and ABI names. They are not independent
+Index: tools/clang/test/Driver/aarch64-fixed-x18.c
+===================================================================
+--- tools/clang/test/Driver/aarch64-fixed-x18.c
++++ tools/clang/test/Driver/aarch64-fixed-x18.c
+@@ -0,0 +1,4 @@
++// RUN: %clang -target aarch64-none-gnu -ffixed-x18 -### %s 2> %t
++// RUN: FileCheck --check-prefix=CHECK-FIXED-X18 < %t %s
++
++// CHECK-FIXED-X18: "-backend-option" "-aarch64-reserve-x18"