From 5c5a4843ec385a60954fbbc4bcf5b64763639bd3 Mon Sep 17 00:00:00 2001
From: Christophe Lyon <christophe.lyon@st.com>
Date: Tue, 20 Mar 2018 10:55:29 +0100
Subject: [ARM] Add TLS relocations for FDPIC.
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Define and handle TLS relocations for FDPIC in BFD and gas.

In gas, the new relocations are rejected if the --fdpic option was not
specified.

We also define the __tdata_start symbol to mark the start of the
.tdata section. This allows FDPIC static binaries to find the start of
.tdata section, since phdr->p_vaddr of TLS segment is not a valid
value for FDPIC.

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

	bfd/:
	* bfd-in2.h (BFD_RELOC_ARM_TLS_GD32_FDPIC)
	(BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC): New
	relocations.
	* elf32-arm.c (elf32_arm_howto_table_2): Add R_ARM_TLS_GD32_FDPIC,
	R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC relocations.
	(elf32_arm_reloc_map): Add R_ARM_TLS_GD32_FDPIC,
	R_ARM_TLS_LDM32_FDPIC, R_ARM_TLS_IE32_FDPIC.
	(struct elf32_arm_link_hash_table): Update comment.
	(elf32_arm_final_link_relocate): Handle TLS FDPIC relocations.
	(IS_ARM_TLS_RELOC): Likewise.
	(elf32_arm_check_relocs): Likewise.
	(allocate_dynrelocs_for_symbol): Likewise.
	(elf32_arm_size_dynamic_sections): Update comment.
	* reloc.c: Add BFD_RELOC_ARM_TLS_GD32_FDPIC,
	BFD_RELOC_ARM_TLS_LDM32_FDPIC, BFD_RELOC_ARM_TLS_IE32_FDPIC.

	gas/
	* config/tc-arm.c (reloc_names): Add TLSGD_FDPIC, TLSLDM_FDPIC,
	GOTTPOFF_FDIC relocations.
	(md_apply_fix): Handle the new TLS FDPIC relocations.
	(tc_gen_reloc): Likewise.
	(arm_fix_adjustable): Likewise.

	include/
	* elf/arm.h: Add R_ARM_TLS_GD32_FDPIC, R_ARM_TLS_LDM32_FDPIC,
	R_ARM_TLS_IE32_FDPIC.

	ld/
	* scripttempl/elf.sc: Define __tdata_start for .tdata section.
---
 ld/ChangeLog          | 5 +++++
 ld/scripttempl/elf.sc | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

(limited to 'ld')

diff --git a/ld/ChangeLog b/ld/ChangeLog
index d9900b5..30de4cb 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,6 +1,11 @@
 2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
 	Mickaël Guêné  <mickael.guene@st.com>
 
+	* scripttempl/elf.sc: Define __tdata_start for .tdata section.
+
+2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
+	Mickaël Guêné  <mickael.guene@st.com>
+
 	* emulparams/armelf_linux_fdpiceabi.sh: Add .rofixup section.
 
 2018-04-25  Christophe Lyon  <christophe.lyon@st.com>
diff --git a/ld/scripttempl/elf.sc b/ld/scripttempl/elf.sc
index 9787ab5..5ccdd41 100644
--- a/ld/scripttempl/elf.sc
+++ b/ld/scripttempl/elf.sc
@@ -587,7 +587,11 @@ cat <<EOF
   .exception_ranges ${RELOCATING-0} : ONLY_IF_RW { *(.exception_ranges .exception_ranges*) }
 
   /* Thread Local Storage sections  */
-  .tdata	${RELOCATING-0} : { *(.tdata${RELOCATING+ .tdata.* .gnu.linkonce.td.*}) }
+  .tdata	${RELOCATING-0} :
+   {
+     ${RELOCATING+${CREATE_SHLIB-PROVIDE_HIDDEN (${USER_LABEL_PREFIX}__tdata_start = .);}}
+     *(.tdata${RELOCATING+ .tdata.* .gnu.linkonce.td.*})
+   }
   .tbss		${RELOCATING-0} : { *(.tbss${RELOCATING+ .tbss.* .gnu.linkonce.tb.*})${RELOCATING+ *(.tcommon)} }
 
   ${RELOCATING+${PREINIT_ARRAY}}
-- 
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