xtensa: generate uapi header and syscall table header files

System call table generation script must be run to gener-
ate unistd_32.h and syscall_table.h files. This patch will
have changes which will invokes the script.

This patch will generate unistd_32.h and syscall_table.h
files by the syscall table generation script invoked by
xtensa/Makefile and the generated files against the removed
files must be identical.

The generated uapi header file will be included in uapi/-
asm/unistd.h and generated system call table header file
will be included by kernel/syscall.c file.
Signed-off-by: Firoz Khan <firoz.khan@linaro.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/Makefile

@@ -90,6 +90,9 @@ boot		:= arch/xtensa/boot
 all Image zImage uImage: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
+archheaders:
+	$(Q)$(MAKE) $(build)=arch/xtensa/kernel/syscalls all
+
 define archhelp
   @echo '* Image       - Kernel ELF image with reset vector'
   @echo '* zImage      - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'

arch/xtensa/include/asm/Kbuild

+generated-y += syscall_table.h
 generic-y += bug.h
 generic-y += compat.h
 generic-y += device.h

arch/xtensa/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generated-y += unistd_32.h
 generic-y += bitsperlong.h
 generic-y += bpf_perf_event.h
 generic-y += errno.h

arch/xtensa/kernel/syscall.c

@@ -33,8 +33,9 @@ typedef void (*syscall_t)(void);
 syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= {
 	[0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall,
 
-#define __SYSCALL(nr,symbol,nargs) [ nr ] = (syscall_t)symbol,
-#include <uapi/asm/unistd.h>
+#define __SYSCALL(nr, entry, nargs)[nr] = (syscall_t)entry,
+#include <asm/syscall_table.h>
+#undef __SYSCALL
 };
 
 #define COLOUR_ALIGN(addr, pgoff) \