parisc: Add 64-bit gettimeofday() and clock_gettime() vDSO functions

Add 64-bit vDSO implementations for gettimeofday() and clock_gettime().
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/kernel/vdso64/Makefile

-# List of files in the vdso, has to be asm only for now
+# Include the generic Makefile to check the built vdso.
+include $(srctree)/lib/vdso/Makefile
+
+KCOV_INSTRUMENT := n
+
+# Disable gcov profiling, ubsan and kasan for VDSO code
+GCOV_PROFILE := n
+UBSAN_SANITIZE := n
+KASAN_SANITIZE := n
+KCSAN_SANITIZE := n
 
 obj-vdso64 = note.o sigtramp.o restart_syscall.o
+obj-cvdso64 = vdso64_generic.o
 
 # Build rules
 
-targets := $(obj-vdso64) vdso64.so
+targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so
 obj-vdso64  := $(addprefix $(obj)/, $(obj-vdso64))
+obj-cvdso64 := $(addprefix $(obj)/, $(obj-cvdso64))
 
+VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE)
 
 ccflags-y := -shared -fno-common -fno-builtin
 ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
@@ -26,18 +39,22 @@ $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so FORCE
 
 # Force dependency (incbin is bad)
 # link rule for the .so file, .lds has to be first
-$(obj)/vdso64.so: $(obj)/vdso64.lds $(obj-vdso64) $(VDSO_LIBGCC) FORCE
+$(obj)/vdso64.so: $(obj)/vdso64.lds $(obj-vdso64) $(obj-cvdso64) $(VDSO_LIBGCC) FORCE
 	$(call if_changed,vdso64ld)
 
 # assembly rules for the .S files
 $(obj-vdso64): %.o: %.S FORCE
 	$(call if_changed_dep,vdso64as)
+$(obj-cvdso64): %.o: %.c FORCE
+	$(call if_changed_dep,vdso64cc)
 
 # actual build commands
 quiet_cmd_vdso64ld = VDSO64L $@
       cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@
 quiet_cmd_vdso64as = VDSO64A $@
       cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
+quiet_cmd_vdso64cc = VDSO64C $@
+      cmd_vdso64cc = $(CC) $(c_flags) -c -o $@ $<
 
 # Generate VDSO offsets using helper script
 gen-vdsosym := $(src)/gen_vdso_offsets.sh

arch/parisc/kernel/vdso64/vdso64.lds.S

@@ -104,6 +104,8 @@ VERSION
     global:
 	__kernel_sigtramp_rt64;
 	__kernel_restart_syscall64;
+	__vdso_gettimeofday;
+	__vdso_clock_gettime;
     local: *;
   };
 }

arch/parisc/kernel/vdso64/vdso64_generic.c

+// SPDX-License-Identifier: GPL-2.0
+
+#include "asm/unistd.h"
+#include <linux/types.h>
+
+struct timezone;
+struct __kernel_timespec;
+struct __kernel_old_timeval;
+
+/* forward declarations */
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz);
+int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts);
+
+
+int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
+			struct timezone *tz)
+{
+	return syscall2(__NR_gettimeofday, (long)tv, (long)tz);
+}
+
+int __vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
+{
+	return syscall2(__NR_clock_gettime, (long)clock, (long)ts);
+}