Autogenerate syscall table based on other files

so3/Kbuild

@@ -2,15 +2,31 @@
 # Kbuild for top-level directory of the kernel
 # This file takes care of the following:
 
-# Generate asm-offsets.h 
+# Generate syscall_table.h.in and syscall_number.h
+
+syscall-files = include/generated/syscall_table.h.in
+syscall-files += include/generated/syscall_number.h
+syscall-script = scripts/syscall_gen.sh
+syscall-src = syscall.tbl arch/$(SRCARCH)/syscall.h.in
+
+quiet_cmd_syscall_gen = GEN     $@
+      cmd_syscall_gen = $(syscall-script) $(syscall-src) $(syscall-files)
+
+$(syscall-files) &: $(syscall-script) $(syscall-src) Kbuild FORCE
+	$(call if_changed,syscall_gen)
+
+always  := $(syscall-files)
+targets := $(syscall-files)
+
+# Generate asm-offsets.h
 #
 
 offsets-file := include/generated/asm-offsets.h
 
-always  := $(offsets-file)
-targets := $(offsets-file)
+always  += $(offsets-file)
+targets += $(offsets-file)
 targets += arch/$(SRCARCH)/asm-offsets.s
- 
+
 # Default sed regexp - multiline due to syntax constraints
 define sed-y
 	"/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"
@@ -34,10 +50,9 @@ define cmd_offsets
 endef
 
 # We use internal kbuild rules to avoid the "is up to date" message from make
-arch/$(SRCARCH)/asm-offsets.s: $(srctree)/arch/$(SRCARCH)/asm-offsets.c  FORCE
+arch/$(SRCARCH)/asm-offsets.s: $(srctree)/arch/$(SRCARCH)/asm-offsets.c include/generated/syscall_number.h FORCE
 	$(Q)mkdir -p $(dir $@)
 	$(call if_changed_dep,cc_s_c)
 
 $(offsets-file): arch/$(SRCARCH)/asm-offsets.s Kbuild
 	$(call cmd,offsets)
-

so3/arch/arm32/context.S

@@ -272,7 +272,7 @@ ENTRY(__root_proc)
 	mov r0, #STDOUT
 	adr r1, .LC_welcome
 	mov r2, #welcome_len
-	mov r7, #SYSCALL_WRITE
+	mov r7, #SYSCALL_write
 	@ Invoke the syscall - kernel side
 	svc	0
 
@@ -282,6 +282,6 @@ ENTRY(__root_proc)
 	mov r1, #0
 	mov r2, #0
 
-	mov	r7, #SYSCALL_EXECVE
+	mov	r7, #SYSCALL_execve
 
 	svc 0

so3/arch/arm32/exception.S

@@ -199,7 +199,7 @@ syscall_interrupt:
 	add	lr, sp, #OFFSET_SP_USR
 	stmia	lr, {sp, lr}^
 
-	cmp	r7, #SYSCALL_SIGRETURN
+	cmp	r7, #SYSCALL_sigreturn
 	beq	__after_push_sp_usr
 
 	ldr	r0, [sp, #OFFSET_SP_USR]
@@ -228,7 +228,7 @@ __after_push_sp_usr:
 
 	@ Check if sigreturn has been called. In this case, we
 	@ clean the stack frame which has been used to manage the user handler.
-	cmp	r7, #SYSCALL_SIGRETURN
+	cmp	r7, #SYSCALL_sigreturn
 	bne	__no_sigreturn
 
 	@ Reset the stack frame by removing the one issued from sigreturn
@@ -246,7 +246,7 @@ __no_sigreturn:
 __ret_from_fork:
 
 	@ Store the return value on the stack frame
-	cmp	r7, #SYSCALL_SIGRETURN
+	cmp	r7, #SYSCALL_sigreturn
 	strne	r0, [sp, #OFFSET_R0]
 
 #ifdef CONFIG_IPC_SIGNAL