s390/syscalls: add Makefile to generate system call header files

Generate the system call specific files from the archheaders
and archprepare make targets.
Signed-off-by: NHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Acked-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/Makefile

@@ -111,6 +111,7 @@ drivers-y	+= drivers/s390/
 drivers-$(CONFIG_OPROFILE)	+= arch/s390/oprofile/
 
 boot		:= arch/s390/boot
+syscalls	:= arch/s390/kernel/syscalls
 tools		:= arch/s390/tools
 
 all: image bzImage
@@ -132,7 +133,11 @@ archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)
 	$(Q)$(MAKE) $(clean)=$(tools)
 
+archheaders:
+	$(Q)$(MAKE) $(build)=$(syscalls) uapi
+
 archprepare:
+	$(Q)$(MAKE) $(build)=$(syscalls) kapi
 	$(Q)$(MAKE) $(build)=$(tools) include/generated/facilities.h
 	$(Q)$(MAKE) $(build)=$(tools) include/generated/dis.h
 

arch/s390/kernel/syscalls/Makefile

+# SPDX-License-Identifier: GPL-2.0
+
+gen	:= arch/$(ARCH)/include/generated
+kapi	:= $(gen)/asm
+uapi	:= $(gen)/uapi/asm
+
+syscall	:= $(srctree)/$(src)/syscall.tbl
+systbl	:= $(srctree)/$(src)/syscalltbl
+
+gen-y := $(kapi)/syscall_table.h
+kapi-hdrs-y := $(kapi)/unistd_nr.h
+uapi-hdrs-y := $(uapi)/unistd_32.h
+uapi-hdrs-y += $(uapi)/unistd_64.h
+
+targets += $(addprefix ../../../,$(gen-y) $(kapi-hdrs-y) $(uapi-hdrs-y))
+
+PHONY += kapi uapi
+
+kapi:	$(gen-y) $(kapi-hdrs-y)
+uapi:	$(uapi-hdrs-y)
+
+
+# Create output directory if not already present
+_dummy := $(shell [ -d '$(uapi)' ] || mkdir -p '$(uapi)') \
+	  $(shell [ -d '$(kapi)' ] || mkdir -p '$(kapi)')
+
+define filechk_syshdr
+	$(CONFIG_SHELL) '$(systbl)' -H -a $(syshdr_abi_$(basetarget)) -f "$2"
+endef
+
+define filechk_sysnr
+	$(CONFIG_SHELL) '$(systbl)' -N -a $(sysnr_abi_$(basetarget))
+endef
+
+define filechk_syscalls
+	$(CONFIG_SHELL) '$(systbl)' -S
+endef
+
+syshdr_abi_unistd_32 := common,32
+$(uapi)/unistd_32.h: $(syscall) FORCE
+	$(call filechk,syshdr,$@)
+
+syshdr_abi_unistd_64 := common,64
+$(uapi)/unistd_64.h: $(syscall) FORCE
+	$(call filechk,syshdr,$@)
+
+$(kapi)/syscall_table.h: $(syscall) FORCE
+	$(call filechk,syscalls)
+
+sysnr_abi_unistd_nr := common,32,64
+$(kapi)/unistd_nr.h: $(syscall) FORCE
+	$(call filechk,sysnr)