[PATCH] D41134: [compiler-rt] [builtins] Implement __chkstk for arm64 windows

[Martin Storsjö via Phabricator via llvm-commits]

mstorsjo created this revision.
mstorsjo added reviewers: compnerd, efriedma, t.p.northover.
Herald added subscribers: kristof.beyls, javed.absar, mgorny, dberris, aemerson.

Do a trivial implementation of the function, similar-ish to the existing one for x86.


https://reviews.llvm.org/D41134

Files:
  lib/builtins/CMakeLists.txt
  lib/builtins/aarch64/chkstk.S


Index: lib/builtins/aarch64/chkstk.S
===================================================================
--- /dev/null
+++ lib/builtins/aarch64/chkstk.S
@@ -0,0 +1,32 @@
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+
+#include "../assembly.h"
+
+// __chkstk routine
+// This routine is windows specific
+// http://msdn.microsoft.com/en-us/library/ms648426.aspx
+
+//      mov     x15, #256 // Number of bytes of stack, in units of 16 byte
+//      bl      __chkstk
+//      sub     sp, sp, x15, lsl #4
+
+#ifdef __aarch64__
+
+        .p2align 2
+DEFINE_COMPILERRT_FUNCTION(__chkstk)
+        lsl    x16, x15, #4
+        mov    x17, sp
+        // There's no need to touch the final page, so subtract away
+        // one page before starting.
+        sub    x16, x16, #0x1000
+1:
+        sub    x17, x17, #0x1000
+        subs   x16, x16, #0x1000
+        ldr    xzr, [x17]
+        b.gt   1b
+
+        ret
+END_COMPILERRT_FUNCTION(__chkstk)
+
+#endif // __aarch64__
Index: lib/builtins/CMakeLists.txt
===================================================================
--- lib/builtins/CMakeLists.txt
+++ lib/builtins/CMakeLists.txt
@@ -437,6 +437,12 @@
   ${GENERIC_TF_SOURCES}
   ${GENERIC_SOURCES})
 
+if (MINGW)
+  set(aarch64_SOURCES
+      ${aarch64_SOURCES}
+      aarch64/chkstk.S)
+endif()
+
 set(armhf_SOURCES ${arm_SOURCES})
 set(armv7_SOURCES ${arm_SOURCES})
 set(armv7s_SOURCES ${arm_SOURCES})


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D41134.126627.patch
Type: text/x-patch
Size: 1499 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20171212/cd1b3b54/attachment.bin>