[ARM] Add armelf_linux_fdpiceabi and armelfb_linux_fdpiceabi BFD backends

Initial definition of these new backends.

2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
	Mickaël Guêné  <mickael.guene@st.com>

	bfd/
	* config.bfd (arm*-*-linux-*): Add arm_elf32_fdpic_be_vec and
	arm_elf32_fdpic_le_vec to targ_selvecs. Accept
	arm*-*-uclinuxfdpiceabi.
	* configure.ac: Add support for arm_elf32_fdpic_be_vec and
	arm_elf32_fdpic_le_vec.
	* configure: Regenerate.
	* elf32-arm.c (struct elf32_arm_link_hash_table): Add fdpic_p.
	(elf32_arm_link_hash_table_create): Initialize fdpic_p.
	(TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, TARGET_BIG_SYM)
	(TARGET_BIG_NAME, elf_match_priority): Define for FDPIC targets.
	(elf32_arm_fdpic_link_hash_table_create): New.
	* targets.c (_bfd_target_vector): Add arm_elf32_fdpic_be_vec and
	arm_elf32_fdpic_le_vec.

	ld/
	* Makefile.am (ALL_EMULATION_SOURCES): Add
	earmelf_linux_fdpiceabi.c and earmelfb_linux_fdpiceabi.c.
	(earmelf_linux_fdpiceabi.c, earmelfb_linux_fdpiceabi.c): New rules.
	* Makefile.in: Regenerate.
	* configure.tgt (arm*-*-uclinuxfdpiceabi): Handle new target.
	* emulparams/armelf_linux_fdpiceabi.sh: New.
	* emulparams/armelfb_linux_fdpiceabi.sh: New.

6 files changed, 71 insertions, 2 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 91a41ae..ed96fcd 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,20 @@
+2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
+	Mickaël Guêné  <mickael.guene@st.com>
+
+	* config.bfd (arm*-*-linux-*): Add arm_elf32_fdpic_be_vec and
+	arm_elf32_fdpic_le_vec to targ_selvecs. Accept
+	arm*-*-uclinuxfdpiceabi.
+	* configure.ac: Add support for arm_elf32_fdpic_be_vec and
+	arm_elf32_fdpic_le_vec.
+	* configure: Regenerate.
+	* elf32-arm.c (struct elf32_arm_link_hash_table): Add fdpic_p.
+	(elf32_arm_link_hash_table_create): Initialize fdpic_p.
+	(TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, TARGET_BIG_SYM)
+	(TARGET_BIG_NAME, elf_match_priority): Define for FDPIC targets.
+	(elf32_arm_fdpic_link_hash_table_create): New.
+	* targets.c (_bfd_target_vector): Add arm_elf32_fdpic_be_vec and
+	arm_elf32_fdpic_le_vec.
+
 2018-04-25  Alan Modra  <amodra@gmail.com>
 
 	* elf-linux-core.h: Disable gcc-8 string truncation warning.
diff --git a/bfd/config.bfd b/bfd/config.bfd
index 24f6573..0b40636 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -386,9 +386,9 @@ case "${targ}" in
     ;;
   arm-*-elf | arm*-*-freebsd* | arm*-*-linux-* | arm*-*-conix* | \
   arm*-*-uclinux* | arm-*-kfreebsd*-gnu | \
-  arm*-*-eabi* | arm-*-rtems*)
+  arm*-*-eabi* | arm-*-rtems* | arm*-*-uclinuxfdpiceabi)
     targ_defvec=arm_elf32_le_vec
-    targ_selvecs=arm_elf32_be_vec
+    targ_selvecs="arm_elf32_fdpic_le_vec arm_elf32_be_vec arm_elf32_fdpic_be_vec"
     ;;
   arm*-*-vxworks | arm*-*-windiss)
     targ_defvec=arm_elf32_vxworks_le_vec
diff --git a/bfd/configure b/bfd/configure
index c23dd19..ab9e8ee 100755
--- a/bfd/configure
+++ b/bfd/configure
@@ -14347,6 +14347,8 @@ do
     arc_elf32_le_vec)		 tb="$tb elf32-arc.lo elf32.lo $elf" ;;
     arm_elf32_be_vec)		 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_le_vec)		 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
+    arm_elf32_fdpic_be_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
+    arm_elf32_fdpic_le_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_nacl_be_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_nacl_le_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_symbian_be_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
diff --git a/bfd/configure.ac b/bfd/configure.ac
index 7bcbb16..ae79461 100644
--- a/bfd/configure.ac
+++ b/bfd/configure.ac
@@ -424,6 +424,8 @@ do
     arc_elf32_le_vec)		 tb="$tb elf32-arc.lo elf32.lo $elf" ;;
     arm_elf32_be_vec)		 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_le_vec)		 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
+    arm_elf32_fdpic_be_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
+    arm_elf32_fdpic_le_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_nacl_be_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_nacl_le_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
     arm_elf32_symbian_be_vec)	 tb="$tb elf32-arm.lo elf32.lo elf-nacl.lo elf-vxworks.lo $elf" ;;
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index ce9c2f2..565bb40 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -3228,6 +3228,9 @@ struct elf32_arm_link_hash_table
   unsigned int bfd_count;
   unsigned int top_index;
   asection **input_list;
+
+  /* True if the target system uses FDPIC. */
+  int fdpic_p;
 };
 
 static inline int
@@ -3806,6 +3809,7 @@ elf32_arm_link_hash_table_create (bfd *abfd)
 #endif
   ret->use_rel = TRUE;
   ret->obfd = abfd;
+  ret->fdpic_p = 0;
 
   if (!bfd_hash_table_init (&ret->stub_hash_table, stub_hash_newfunc,
 			    sizeof (struct elf32_arm_stub_hash_entry)))
@@ -19411,6 +19415,46 @@ elf32_arm_nacl_plt_sym_val (bfd_vma i, const asection *plt,
 #define ELF_COMMONPAGESIZE		0x1000
 
 
+/* FDPIC Targets.  */
+
+#undef  TARGET_LITTLE_SYM
+#define TARGET_LITTLE_SYM		arm_elf32_fdpic_le_vec
+#undef  TARGET_LITTLE_NAME
+#define TARGET_LITTLE_NAME		"elf32-littlearm-fdpic"
+#undef  TARGET_BIG_SYM
+#define TARGET_BIG_SYM			arm_elf32_fdpic_be_vec
+#undef  TARGET_BIG_NAME
+#define TARGET_BIG_NAME			"elf32-bigarm-fdpic"
+#undef elf_match_priority
+#define elf_match_priority		128
+
+/* Like elf32_arm_link_hash_table_create -- but overrides
+   appropriately for FDPIC.  */
+
+static struct bfd_link_hash_table *
+elf32_arm_fdpic_link_hash_table_create (bfd *abfd)
+{
+  struct bfd_link_hash_table *ret;
+
+  ret = elf32_arm_link_hash_table_create (abfd);
+  if (ret)
+    {
+      struct elf32_arm_link_hash_table *htab = (struct elf32_arm_link_hash_table *) ret;
+
+      htab->fdpic_p = 1;
+    }
+  return ret;
+}
+
+#undef  elf32_bed
+#define elf32_bed				elf32_arm_fdpic_bed
+
+#undef  bfd_elf32_bfd_link_hash_table_create
+#define bfd_elf32_bfd_link_hash_table_create 	elf32_arm_fdpic_link_hash_table_create
+
+#include "elf32-target.h"
+#undef elf_match_priority
+
 /* VxWorks Targets.  */
 
 #undef	TARGET_LITTLE_SYM
diff --git a/bfd/targets.c b/bfd/targets.c
index 3fb60cb..e490f5f 100644
--- a/bfd/targets.c
+++ b/bfd/targets.c
@@ -599,6 +599,8 @@ extern const bfd_target arc_elf32_be_vec;
 extern const bfd_target arc_elf32_le_vec;
 extern const bfd_target arm_elf32_be_vec;
 extern const bfd_target arm_elf32_le_vec;
+extern const bfd_target arm_elf32_fdpic_be_vec;
+extern const bfd_target arm_elf32_fdpic_le_vec;
 extern const bfd_target arm_elf32_nacl_be_vec;
 extern const bfd_target arm_elf32_nacl_le_vec;
 extern const bfd_target arm_elf32_symbian_be_vec;
@@ -921,6 +923,8 @@ static const bfd_target * const _bfd_target_vector[] =
 
 	&arm_elf32_be_vec,
 	&arm_elf32_le_vec,
+	&arm_elf32_fdpic_be_vec,
+	&arm_elf32_fdpic_le_vec,
 	&arm_elf32_symbian_be_vec,
 	&arm_elf32_symbian_le_vec,
 	&arm_elf32_vxworks_be_vec,