[glibc/release/2.26/master] aarch64: add STO_AARCH64_VARIANT_PCS and DT_AARCH64_VARIANT_PCS

[Szabolcs Nagy <nsz@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=71c2578a9b0ea0e5a37c88ee01885213f40eaeea

commit 71c2578a9b0ea0e5a37c88ee01885213f40eaeea
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Thu Apr 25 15:35:35 2019 +0100

    aarch64: add STO_AARCH64_VARIANT_PCS and DT_AARCH64_VARIANT_PCS
    
    STO_AARCH64_VARIANT_PCS is a non-visibility st_other flag for marking
    symbols that reference functions that may follow a variant PCS with
    different register usage convention from the base PCS.
    
    DT_AARCH64_VARIANT_PCS is a dynamic tag that marks ELF modules that
    have R_*_JUMP_SLOT relocations for symbols marked with
    STO_AARCH64_VARIANT_PCS (i.e. have variant PCS calls via a PLT).
    
    	* elf/elf.h (STO_AARCH64_VARIANT_PCS): Define.
    	(DT_AARCH64_VARIANT_PCS): Define.

Diff:
---
 ChangeLog | 5 +++++
 elf/elf.h | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index fff671f..55dde7d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2019-06-13  Szabolcs Nagy  <szabolcs.nagy@arm.com>
+
+	* elf/elf.h (STO_AARCH64_VARIANT_PCS): Define.
+	(DT_AARCH64_VARIANT_PCS): Define.
+
 2019-05-22  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	[BZ #24531]
diff --git a/elf/elf.h b/elf/elf.h
index 3900b4c..f80506c 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -2759,6 +2759,13 @@ enum
 #define R_AARCH64_TLSDESC      1031	/* TLS Descriptor.  */
 #define R_AARCH64_IRELATIVE	1032	/* STT_GNU_IFUNC relocation.  */
 
+/* AArch64 specific values for the Dyn d_tag field.  */
+#define DT_AARCH64_VARIANT_PCS	(DT_LOPROC + 5)
+#define DT_AARCH64_NUM		6
+
+/* AArch64 specific values for the st_other field.  */
+#define STO_AARCH64_VARIANT_PCS 0x80
+
 /* ARM relocs.  */
 
 #define R_ARM_NONE		0	/* No reloc */