Add AT_RSEQ_* from Linux 6.3 to elf.h

Linux 6.3 adds constants AT_RSEQ_FEATURE_SIZE and AT_RSEQ_ALIGN; add
them to glibc's elf.h.  (Recall that, although elf.h is a
system-independent header, so far we've put AT_* constants there even
if Linux-specific, as discussed in bug 15794.  So rather than making
any attempt to fix that issue, the new constants are just added there
alongside the existing ones.)

Tested for x86_64.

(cherry picked from commit 8754a4133e154ca853e6765a3fe5c7a904c77626)

1 files changed, 3 insertions, 0 deletions

diff --git a/elf/elf.h b/elf/elf.h
index 0735f6b..c5e318b 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -1205,6 +1205,9 @@ typedef struct
 #define AT_HWCAP2	26		/* More machine-dependent hints about
 					   processor capabilities.  */
 
+#define AT_RSEQ_FEATURE_SIZE	27	/* rseq supported feature size.  */
+#define AT_RSEQ_ALIGN	28		/* rseq allocation alignment.  */
+
 #define AT_EXECFN	31		/* Filename of executable.  */
 
 /* Pointer to the global system page used for system calls and other