[glibc/alistair/rv32.next] RISC-V: Add support for 32-bit vDSO calls

[Alistair Francis <alistair23@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=57587db0219854ce7bdebc339ee0ce341c9f9e37

commit 57587db0219854ce7bdebc339ee0ce341c9f9e37
Author: Alistair Francis <alistair.francis@wdc.com>
Date:   Wed Sep 18 08:41:59 2019 -0700

    RISC-V: Add support for 32-bit vDSO calls

Diff:
---
 sysdeps/unix/sysv/linux/riscv/sysdep.h | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/riscv/sysdep.h b/sysdeps/unix/sysv/linux/riscv/sysdep.h
index aa61e8b04d..9f6ed2001b 100644
--- a/sysdeps/unix/sysv/linux/riscv/sysdep.h
+++ b/sysdeps/unix/sysv/linux/riscv/sysdep.h
@@ -182,14 +182,21 @@
 
 #ifndef __ASSEMBLER__
 
-# define VDSO_NAME  "LINUX_4.15"
-# define VDSO_HASH  182943605
+# if __riscv_xlen == 32
+#  define VDSO_NAME  "LINUX_5.4"
+#  define VDSO_HASH  61765876
 
 /* List of system calls which are supported as vsyscalls.  */
-# define HAVE_CLOCK_GETRES64_VSYSCALL	"__vdso_clock_getres"
-# define HAVE_CLOCK_GETTIME64_VSYSCALL	"__vdso_clock_gettime"
-# define HAVE_GETTIMEOFDAY_VSYSCALL	"__vdso_gettimeofday"
-# define HAVE_GETCPU_VSYSCALL		"__vdso_getcpu"
+# else
+#  define VDSO_NAME  "LINUX_4.15"
+#  define VDSO_HASH  182943605
+
+/* List of system calls which are supported as vsyscalls.  */
+#  define HAVE_CLOCK_GETRES64_VSYSCALL   "__vdso_clock_getres"
+#  define HAVE_CLOCK_GETTIME64_VSYSCALL  "__vdso_clock_gettime"
+#  define HAVE_GETTIMEOFDAY_VSYSCALL     "__vdso_gettimeofday"
+#  define HAVE_GETCPU_VSYSCALL           "__vdso_getcpu"
+# endif
 
 # define INTERNAL_SYSCALL(name, nr, args...) \
 	internal_syscall##nr (SYS_ify (name), args)