From 44ef03008c75059368245eb3dcd6054bed3f7643 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Mon, 1 Oct 2018 20:17:11 +0000
Subject: [PATCH] libgo: support x32 as GOARCH=amd64p32 GOOS=linux

    This is enough to let libgo build when configured using
    --with-multilib-list=m64,m32,mx32.  I don't have an x32-enabled kernel
    so I haven't tested whether it executes correctly.

    For https://gcc.gnu.org/PR87470

    Reviewed-on: https://go-review.googlesource.com/138817

From-SVN: r264772
---
 gcc/go/gofrontend/MERGE                              |  2 +-
 libgo/configure                                      | 12 ++++++++++++
 libgo/configure.ac                                   |  9 +++++++--
 libgo/go/hash/crc32/crc32_amd64p32.go                |  2 ++
 .../syscall/unix/getrandom_linux_amd64p32.go         |  9 +++++++++
 libgo/go/runtime/lfstack_32bit.go                    |  2 +-
 libgo/goarch.sh                                      |  7 ++++++-
 7 files changed, 38 insertions(+), 5 deletions(-)
 create mode 100644 libgo/go/internal/syscall/unix/getrandom_linux_amd64p32.go

diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 69dd8b746b7..6ad214689fb 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-013a9e68c9a31f888733d46182d19f9e5d956f27
+2f56d51c6b3104242613c74b02fa6c63a2fe16c5
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/configure b/libgo/configure
index 7166f94016b..f7996e115eb 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -13685,7 +13685,19 @@ _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   GOARCH=386
 else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifdef __ILP32__
+#error x32
+#endif
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
   GOARCH=amd64
+else
+  GOARCH=amd64p32
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     ;;
diff --git a/libgo/configure.ac b/libgo/configure.ac
index 1c192752ab2..20ce205f2f4 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -252,8 +252,13 @@ changequote([,])dnl
 #ifdef __x86_64__
 #error 64-bit
 #endif],
-[GOARCH=386],
-[GOARCH=amd64])
+	[GOARCH=386],
+	AC_COMPILE_IFELSE([
+#ifdef __ILP32__
+#error x32
+#endif],
+	[GOARCH=amd64],
+	[GOARCH=amd64p32]))
     ;;
   ia64-*-*)
     GOARCH=ia64
diff --git a/libgo/go/hash/crc32/crc32_amd64p32.go b/libgo/go/hash/crc32/crc32_amd64p32.go
index 1ec44cb496a..f61b801b418 100644
--- a/libgo/go/hash/crc32/crc32_amd64p32.go
+++ b/libgo/go/hash/crc32/crc32_amd64p32.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build ignore
+
 package crc32
 
 import "internal/cpu"
diff --git a/libgo/go/internal/syscall/unix/getrandom_linux_amd64p32.go b/libgo/go/internal/syscall/unix/getrandom_linux_amd64p32.go
new file mode 100644
index 00000000000..911b6089ff3
--- /dev/null
+++ b/libgo/go/internal/syscall/unix/getrandom_linux_amd64p32.go
@@ -0,0 +1,9 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package unix
+
+// Linux getrandom system call number.
+// See GetRandom in getrandom_linux.go.
+const randomTrap uintptr = 0x40000000 + 318
diff --git a/libgo/go/runtime/lfstack_32bit.go b/libgo/go/runtime/lfstack_32bit.go
index 1288c1a2aaa..f50c50895b4 100644
--- a/libgo/go/runtime/lfstack_32bit.go
+++ b/libgo/go/runtime/lfstack_32bit.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build 386 arm nacl armbe m68k mips mipsle mips64p32 mips64p32le nios2 ppc s390 sh shbe sparc
+// +build 386 amd64p32 arm nacl armbe m68k mips mipsle mips64p32 mips64p32le nios2 ppc s390 sh shbe sparc
 
 package runtime
 
diff --git a/libgo/goarch.sh b/libgo/goarch.sh
index f5c0a34b1da..f7aef9d7dde 100755
--- a/libgo/goarch.sh
+++ b/libgo/goarch.sh
@@ -57,10 +57,15 @@ case $goarch in
 	defaultphyspagesize=8192
 	pcquantum=4
 	;;
-    amd64 | amd64p32)
+    amd64)
 	family=AMD64
 	hugepagesize="1 << 21"
 	;;
+    amd64p32)
+	family=AMD64
+	hugepagesize="1 << 21"
+	ptrsize=4
+	;;
     arm | armbe)
 	family=ARM
 	cachelinesize=32
-- 
2.30.2