From 28189ba77af3c76fbe5ed19ac2a78362d16212bf Mon Sep 17 00:00:00 2001
From: Stefan Kalkowski <stefan.kalkowski@genode-labs.com>
Date: Wed, 19 May 2021 10:57:24 +0200
Subject: [PATCH] tool: simplify initcall order extraction

The new tool `extract_initcall_order` generates a header file out of a
Linux kernel build, which provides a sorted array with the initcall function
names of the kernel build. The order states the order in which the initcall
have to be called. It gets extrated out of the Linux kernel System.map.

Fixes #4172
---
 tool/dde_linux/extract_initcall_order | 73 +++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100755 tool/dde_linux/extract_initcall_order

diff --git a/tool/dde_linux/extract_initcall_order b/tool/dde_linux/extract_initcall_order
new file mode 100755
index 0000000000..445ab7e3bf
--- /dev/null
+++ b/tool/dde_linux/extract_initcall_order
@@ -0,0 +1,73 @@
+#!/usr/bin/make -f
+#
+# \brief  Initcall order extraction tool for DDE Linux
+# \author Stefan Kalkowski
+# \date   2021-05-16
+#
+
+help:
+	$(ECHO) ""
+	$(ECHO) "Extracts initcall order into header file for DDE Linux"
+	$(ECHO) ""
+	$(ECHO) "usage:"
+	$(ECHO) ""
+	$(ECHO) "  extract_initcall_order <command> [VARIABLES]"
+	$(ECHO) ""
+	$(ECHO) "--- available commands ---"
+	$(ECHO) "help        - shows this help"
+	$(ECHO) "extract     - extracts initcall order to HEADER_FILE"
+	$(ECHO) ""
+	$(ECHO) "--- used variables ---"
+	$(ECHO) "LINUX_KERNEL_DIR  - path to the Linux kernel build"
+	$(ECHO) "HEADER_FILE       - path to the file that shall be generated"
+	$(ECHO) ""
+
+
+COMMAND := $(firstword $(MAKECMDGOALS))
+
+SHELL        = bash
+BRIGHT_COL   = \033[01;33m
+DEFAULT_COL  = \033[0m
+ECHO         = @echo -e
+
+
+ifeq ($(COMMAND),extract)
+ifeq ($(realpath $(LINUX_KERNEL_DIR)),)
+$(error You have to state a valid LINUX_KERNEL_DIR, try help)
+endif
+
+ifeq ($(HEADER_FILE),)
+$(error You have to state a HEADER_FILE, try help)
+endif
+endif
+
+define print_file_header
+echo "/*"                                                          > $(2);
+echo " * \\brief  Array defining order of Linux Kernel initcalls" >> $(2);
+echo " * \\author Automatically generated file - do no edit"      >> $(2);
+echo " * \\date   $(1)"                                           >> $(2);
+echo " */"                                                        >> $(2);
+echo ""                                                           >> $(2);
+echo "#pragma once"                                               >> $(2);
+echo ""                                                           >> $(2);
+echo "static const char * lx_emul_initcall_order[] = {"           >> $(2);
+endef
+
+define print_symbol
+echo "	\"$(1)\"," >> $(2);
+endef
+
+define print_file_footer
+echo "	\"END_OF_INITCALL_ORDER_ARRAY_DUMMY_ENTRY\"" >> $(1);
+echo "};" >> $(1);
+endef
+
+INITCALLS = $(shell grep -i "^[0-9a-f]* [t] __initcall_" $(LINUX_KERNEL_DIR)/System.map | awk '{print $$3}')
+
+extract:
+	@$(call print_file_header,$(shell date +"%F"),$(HEADER_FILE))
+	@$(foreach sym,$(INITCALLS),$(call print_symbol,$(sym),$(HEADER_FILE)))
+	@$(call print_file_footer,$(HEADER_FILE))
+
+
+.PHONY: extract help