parisc: Add 32-bit gettimeofday() and clock_gettime() vDSO functions

Add vDSO implementations for gettimeofday(), clock_gettime() and
clock_gettime64() kernel syscalls.
Currently those functions are implemented as pure syscall wrappers.

Signed-off-by: Helge Deller <deller@gmx.de>

Author: hdeller

arch/parisc/include/asm/vdso.h

@@ -19,6 +19,6 @@ extern struct vdso_data *vdso_data;
 /* Default link addresses for the vDSOs */
 #define VDSO_LBASE	0
 
-#define VDSO_VERSION_STRING	LINUX_5.18
+#define VDSO_VERSION_STRING	LINUX_6.11
 
 #endif /* __PARISC_VDSO_H__ */

arch/parisc/kernel/vdso32/Makefile

@@ -1,11 +1,25 @@
-# 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-vdso32 = note.o sigtramp.o restart_syscall.o
+obj-cvdso32 = vdso32_generic.o
 
 # Build rules
 
-targets := $(obj-vdso32) vdso32.so
+targets := $(obj-vdso32) $(obj-cvdso32) vdso32.so
 obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
+obj-cvdso32 := $(addprefix $(obj)/, $(obj-cvdso32))
+
+VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE)
+CFLAGS_REMOVE_vdso32_generic.o = $(VDSO_CFLAGS_REMOVE)
 
 ccflags-y := -shared -fno-common -fbuiltin -mno-fast-indirect-calls -O2 -mno-long-calls
 #  -march=1.1 -mschedule=7100LC
@@ -26,18 +40,22 @@ $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so FORCE
 
 # Force dependency (incbin is bad)
 # link rule for the .so file, .lds has to be first
-$(obj)/vdso32.so: $(obj)/vdso32.lds $(obj-vdso32) $(VDSO_LIBGCC) FORCE
+$(obj)/vdso32.so: $(obj)/vdso32.lds $(obj-vdso32) $(obj-cvdso32) $(VDSO_LIBGCC) FORCE
 	$(call if_changed,vdso32ld)
 
 # assembly rules for the .S files
 $(obj-vdso32): %.o: %.S FORCE
 	$(call if_changed_dep,vdso32as)
+$(obj-cvdso32): %.o: %.c FORCE
+	$(call if_changed_dep,vdso32cc)
 
 # actual build commands
 quiet_cmd_vdso32ld = VDSO32L $@
       cmd_vdso32ld = $(CROSS32CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@
 quiet_cmd_vdso32as = VDSO32A $@
       cmd_vdso32as = $(CROSS32CC) $(a_flags) -c -o $@ $<
+quiet_cmd_vdso32cc = VDSO32C $@
+      cmd_vdso32cc = $(CROSS32CC) $(c_flags) -c -o $@ $<
 
 # Generate VDSO offsets using helper script
 gen-vdsosym := $(src)/gen_vdso_offsets.sh

arch/parisc/kernel/vdso32/vdso32.lds.S

@@ -106,6 +106,9 @@ VERSION
     global:
 	__kernel_sigtramp_rt32;
 	__kernel_restart_syscall32;
+	__vdso_gettimeofday;
+	__vdso_clock_gettime;
+	__vdso_clock_gettime64;
     local: *;
   };
 }

arch/parisc/kernel/vdso32/vdso32_generic.c

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "asm/unistd.h"
+#include <linux/types.h>
+#include <uapi/asm/unistd_32.h>
+
+struct timezone;
+struct old_timespec32;
+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 old_timespec32 *ts);
+int __vdso_clock_gettime64(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 old_timespec32 *ts)
+{
+	return syscall2(__NR_clock_gettime, (long)clock, (long)ts);
+}
+
+int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
+{
+	return syscall2(__NR_clock_gettime64, (long)clock, (long)ts);
+}