Put local/global relocs in rw section for -freloc-rwhjl/got/master

Add an option, -freloc-rw, to put local and global relocations in a
read-write section.

gcc/

	PR target/67400
	* common.opt (freloc-rw): New option.
	* targhooks.c (default_reloc_rw_mask): Return 3 for -freloc-rw.

gcc/testsuite/

	PR target/67400
	* gcc.target/i386/pr67400-5.c: New test.
	* gcc.target/i386/pr67400-6.c: Likewise.

4 files changed, 27 insertions, 1 deletions

diff --git a/gcc/common.opt b/gcc/common.opt
index 5bbf6190ec7..875dabec6cd 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2619,6 +2619,10 @@ fzero-initialized-in-bss
 Common Report Var(flag_zero_initialized_in_bss) Init(1)
 Put zero initialized data in the bss section
 
+freloc-rw
+Common Report Var(flag_reloc_rw) Init(0)
+Put local and global relocations in a read-write section.
+
 g
 Common JoinedOrMissing
 Generate debug information in default format
diff --git a/gcc/targhooks.c b/gcc/targhooks.c
index 5077ec97de1..e2da61e9db5 100644
--- a/gcc/targhooks.c
+++ b/gcc/targhooks.c
@@ -1019,7 +1019,7 @@ default_secondary_reload (bool in_p ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED,
 int
 default_reloc_rw_mask (void)
 {
-  return flag_pic ? 3 : 0;
+  return (flag_pic || flag_reloc_rw) ? 3 : 0;
 }
 
 /* By default, do no modification. */
diff --git a/gcc/testsuite/gcc.target/i386/pr67400-5.c b/gcc/testsuite/gcc.target/i386/pr67400-5.c
new file mode 100644
index 00000000000..d3d602aba15
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr67400-5.c
@@ -0,0 +1,11 @@
+/* { dg-do compile { target *-*-linux* } } */
+/* { dg-options "-O2 -fno-pic -freloc-rw" } */
+
+extern void foo (void);
+
+typedef void (*func_p) (void);
+
+const func_p p1 = &foo;
+
+/* { dg-final { scan-assembler ".data.rel.ro" } } */
+/* { dg-final { scan-assembler-not ".rodata" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr67400-6.c b/gcc/testsuite/gcc.target/i386/pr67400-6.c
new file mode 100644
index 00000000000..90ed3c43c86
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr67400-6.c
@@ -0,0 +1,11 @@
+/* { dg-do compile { target *-*-linux* } } */
+/* { dg-options "-O2 -fno-pic -freloc-rw" } */
+
+extern void foo (void);
+
+typedef void (*func_p) (void);
+
+const func_p p1 __attribute__((visibility("hidden"))) = &foo;
+
+/* { dg-final { scan-assembler ".data.rel.ro" } } */
+/* { dg-final { scan-assembler-not ".rodata" } } */