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From 087b12213a5b4b8654c70320c671bb05c1b1b012 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Sat, 13 Jan 2018 18:01:54 -0800
Subject: [PATCH 08/13] x86: Disallow -mindirect-branch=/-mfunction-return=
 with -mcmodel=large

Since the thunk function may not be reachable in large code model,
-mcmodel=large is incompatible with -mindirect-branch=thunk,
-mindirect-branch=thunk-extern, -mfunction-return=thunk and
-mfunction-return=thunk-extern.  Issue an error when they are used with
-mcmodel=large.

gcc/

	Backport from mainline
	2018-01-14  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.c (ix86_set_indirect_branch_type): Disallow
	-mcmodel=large with -mindirect-branch=thunk,
	-mindirect-branch=thunk-extern, -mfunction-return=thunk and
	-mfunction-return=thunk-extern.
	* doc/invoke.texi: Document -mcmodel=large is incompatible with
	-mindirect-branch=thunk, -mindirect-branch=thunk-extern,
	-mfunction-return=thunk and -mfunction-return=thunk-extern.

gcc/testsuite/

	Backport from mainline
	2018-01-14  H.J. Lu  <hongjiu.lu@intel.com>

	* gcc.target/i386/indirect-thunk-10.c: New test.
	* gcc.target/i386/indirect-thunk-8.c: Likewise.
	* gcc.target/i386/indirect-thunk-9.c: Likewise.
	* gcc.target/i386/indirect-thunk-attr-10.c: Likewise.
	* gcc.target/i386/indirect-thunk-attr-11.c: Likewise.
	* gcc.target/i386/indirect-thunk-attr-9.c: Likewise.
	* gcc.target/i386/ret-thunk-17.c: Likewise.
	* gcc.target/i386/ret-thunk-18.c: Likewise.
	* gcc.target/i386/ret-thunk-19.c: Likewise.
	* gcc.target/i386/ret-thunk-20.c: Likewise.
	* gcc.target/i386/ret-thunk-21.c: Likewise.
---
 gcc/config/i386/i386.c                             | 26 ++++++++++++++++++++++
 gcc/doc/invoke.texi                                | 11 +++++++++
 gcc/testsuite/gcc.target/i386/indirect-thunk-10.c  |  7 ++++++
 gcc/testsuite/gcc.target/i386/indirect-thunk-8.c   |  7 ++++++
 gcc/testsuite/gcc.target/i386/indirect-thunk-9.c   |  7 ++++++
 .../gcc.target/i386/indirect-thunk-attr-10.c       |  9 ++++++++
 .../gcc.target/i386/indirect-thunk-attr-11.c       |  9 ++++++++
 .../gcc.target/i386/indirect-thunk-attr-9.c        |  9 ++++++++
 gcc/testsuite/gcc.target/i386/ret-thunk-17.c       |  7 ++++++
 gcc/testsuite/gcc.target/i386/ret-thunk-18.c       |  8 +++++++
 gcc/testsuite/gcc.target/i386/ret-thunk-19.c       |  8 +++++++
 gcc/testsuite/gcc.target/i386/ret-thunk-20.c       |  9 ++++++++
 gcc/testsuite/gcc.target/i386/ret-thunk-21.c       |  9 ++++++++
 13 files changed, 126 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/i386/indirect-thunk-10.c
 create mode 100644 gcc/testsuite/gcc.target/i386/indirect-thunk-8.c
 create mode 100644 gcc/testsuite/gcc.target/i386/indirect-thunk-9.c
 create mode 100644 gcc/testsuite/gcc.target/i386/indirect-thunk-attr-10.c
 create mode 100644 gcc/testsuite/gcc.target/i386/indirect-thunk-attr-11.c
 create mode 100644 gcc/testsuite/gcc.target/i386/indirect-thunk-attr-9.c
 create mode 100644 gcc/testsuite/gcc.target/i386/ret-thunk-17.c
 create mode 100644 gcc/testsuite/gcc.target/i386/ret-thunk-18.c
 create mode 100644 gcc/testsuite/gcc.target/i386/ret-thunk-19.c
 create mode 100644 gcc/testsuite/gcc.target/i386/ret-thunk-20.c
 create mode 100644 gcc/testsuite/gcc.target/i386/ret-thunk-21.c

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index eeca7e5e490..9c038bee000 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -6389,6 +6389,19 @@ ix86_set_indirect_branch_type (tree fndecl)
 	}
       else
 	cfun->machine->indirect_branch_type = ix86_indirect_branch;
+
+      /* -mcmodel=large is not compatible with -mindirect-branch=thunk
+	 nor -mindirect-branch=thunk-extern.  */
+      if ((ix86_cmodel == CM_LARGE || ix86_cmodel == CM_LARGE_PIC)
+	  && ((cfun->machine->indirect_branch_type
+	       == indirect_branch_thunk_extern)
+	      || (cfun->machine->indirect_branch_type
+		  == indirect_branch_thunk)))
+	error ("%<-mindirect-branch=%s%> and %<-mcmodel=large%> are not "
+	       "compatible",
+	       ((cfun->machine->indirect_branch_type
+		 == indirect_branch_thunk_extern)
+		? "thunk-extern" : "thunk"));
     }
 
   if (cfun->machine->function_return_type == indirect_branch_unset)
@@ -6414,6 +6427,19 @@ ix86_set_indirect_branch_type (tree fndecl)
 	}
       else
 	cfun->machine->function_return_type = ix86_function_return;
+
+      /* -mcmodel=large is not compatible with -mfunction-return=thunk
+	 nor -mfunction-return=thunk-extern.  */
+      if ((ix86_cmodel == CM_LARGE || ix86_cmodel == CM_LARGE_PIC)
+	  && ((cfun->machine->function_return_type
+	       == indirect_branch_thunk_extern)
+	      || (cfun->machine->function_return_type
+		  == indirect_branch_thunk)))
+	error ("%<-mfunction-return=%s%> and %<-mcmodel=large%> are not "
+	       "compatible",
+	       ((cfun->machine->function_return_type
+		 == indirect_branch_thunk_extern)
+		? "thunk-extern" : "thunk"));
     }
 }
 
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 94374661f2d..1dee495c86b 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -24242,6 +24242,11 @@ to external call and return thunk provided in a separate object file.
 You can control this behavior for a specific function by using the
 function attribute @code{indirect_branch}.  @xref{Function Attributes}.
 
+Note that @option{-mcmodel=large} is incompatible with
+@option{-mindirect-branch=thunk} nor
+@option{-mindirect-branch=thunk-extern} since the thunk function may
+not be reachable in large code model.
+
 @item -mfunction-return=@var{choice}
 @opindex -mfunction-return
 Convert function return with @var{choice}.  The default is @samp{keep},
@@ -24253,6 +24258,12 @@ object file.  You can control this behavior for a specific function by
 using the function attribute @code{function_return}.
 @xref{Function Attributes}.
 
+Note that @option{-mcmodel=large} is incompatible with
+@option{-mfunction-return=thunk} nor
+@option{-mfunction-return=thunk-extern} since the thunk function may
+not be reachable in large code model.
+
+
 @item -mindirect-branch-register
 @opindex -mindirect-branch-register
 Force indirect call and jump via register.
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-10.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-10.c
new file mode 100644
index 00000000000..a0674bd2363
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-10.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mindirect-branch=thunk-inline -mfunction-return=keep -mcmodel=large" } */
+
+void
+bar (void)
+{
+}
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-8.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-8.c
new file mode 100644
index 00000000000..7a80a8986e8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-8.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mindirect-branch=thunk -mfunction-return=keep -mcmodel=large" } */
+
+void
+bar (void)
+{ /* { dg-error "'-mindirect-branch=thunk' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-9.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-9.c
new file mode 100644
index 00000000000..d4d45c5114d
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-9.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mindirect-branch=thunk-extern -mfunction-return=keep -mcmodel=large" } */
+
+void
+bar (void)
+{ /* { dg-error "'-mindirect-branch=thunk-extern' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-10.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-10.c
new file mode 100644
index 00000000000..3a2aeaddbc5
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-10.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mindirect-branch=keep -mfunction-return=keep -mcmodel=large" } */
+/* { dg-additional-options "-fPIC" { target fpic } } */
+
+__attribute__ ((indirect_branch("thunk-extern")))
+void
+bar (void)
+{ /* { dg-error "'-mindirect-branch=thunk-extern' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-11.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-11.c
new file mode 100644
index 00000000000..8e52f032b6c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-11.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mindirect-branch=keep -mfunction-return=keep -mcmodel=large" } */
+/* { dg-additional-options "-fPIC" { target fpic } } */
+
+__attribute__ ((indirect_branch("thunk-inline")))
+void
+bar (void)
+{
+}
diff --git a/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-9.c b/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-9.c
new file mode 100644
index 00000000000..bdaa4f6911b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/indirect-thunk-attr-9.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mindirect-branch=keep -mfunction-return=keep -mcmodel=large" } */
+/* { dg-additional-options "-fPIC" { target fpic } } */
+
+__attribute__ ((indirect_branch("thunk")))
+void
+bar (void)
+{ /* { dg-error "'-mindirect-branch=thunk' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-17.c b/gcc/testsuite/gcc.target/i386/ret-thunk-17.c
new file mode 100644
index 00000000000..0605e2c6542
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-17.c
@@ -0,0 +1,7 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mfunction-return=thunk -mindirect-branch=keep -mcmodel=large" } */
+
+void
+bar (void)
+{ /* { dg-error "'-mfunction-return=thunk' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-18.c b/gcc/testsuite/gcc.target/i386/ret-thunk-18.c
new file mode 100644
index 00000000000..307019dc242
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-18.c
@@ -0,0 +1,8 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mfunction-return=thunk-extern -mindirect-branch=keep -mcmodel=large" } */
+/* { dg-additional-options "-fPIC" { target fpic } } */
+
+void
+bar (void)
+{ /* { dg-error "'-mfunction-return=thunk-extern' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-19.c b/gcc/testsuite/gcc.target/i386/ret-thunk-19.c
new file mode 100644
index 00000000000..772617f4010
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-19.c
@@ -0,0 +1,8 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mfunction-return=keep -mindirect-branch=keep -mcmodel=large" } */
+
+__attribute__ ((function_return("thunk")))
+void
+bar (void)
+{ /* { dg-error "'-mfunction-return=thunk' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-20.c b/gcc/testsuite/gcc.target/i386/ret-thunk-20.c
new file mode 100644
index 00000000000..1e9f9bd5a66
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-20.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mfunction-return=keep -mindirect-branch=keep -mcmodel=large" } */
+/* { dg-additional-options "-fPIC" { target fpic } } */
+
+__attribute__ ((function_return("thunk-extern")))
+void
+bar (void)
+{ /* { dg-error "'-mfunction-return=thunk-extern' and '-mcmodel=large' are not compatible" } */
+}
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-21.c b/gcc/testsuite/gcc.target/i386/ret-thunk-21.c
new file mode 100644
index 00000000000..eea07f7abe1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-21.c
@@ -0,0 +1,9 @@
+/* { dg-do compile { target { lp64 } } } */
+/* { dg-options "-O2 -mfunction-return=keep -mindirect-branch=keep -mcmodel=large" } */
+/* { dg-additional-options "-fPIC" { target fpic } } */
+
+__attribute__ ((function_return("thunk-inline")))
+void
+bar (void)
+{
+}
-- 
2.16.3