From 37b8a8b8ed084e63885e57f2f53e1e93acb35b33 Mon Sep 17 00:00:00 2001
From: Stefan `Sec` Zehl <sec@42.org>
Date: Wed, 15 Jun 2011 23:31:02 +0200
Subject: [PATCH] Add loadable/ - build infrastructure for small ram
 executables. Also reserve 1k ram for these in the main firmware (Makefile.inc
 variable RAMCODE)

---
 Makefile              | 48 ++++++++++++++++++++++++---------------
 Makefile.inc          |  6 +++--
 loadable/.gitignore   |  3 +++
 loadable/Makefile     | 12 ++++++++++
 loadable/Makefile.sub | 47 ++++++++++++++++++++++++++++++++++++++
 loadable/bin2h.pl     | 41 ++++++++++++++++++++++++++++++++++
 loadable/blinktest.c  | 10 +++++++++
 loadable/loadable.ld  | 52 +++++++++++++++++++++++++++++++++++++++++++
 8 files changed, 199 insertions(+), 20 deletions(-)
 create mode 100644 loadable/.gitignore
 create mode 100644 loadable/Makefile
 create mode 100644 loadable/Makefile.sub
 create mode 100755 loadable/bin2h.pl
 create mode 100644 loadable/blinktest.c
 create mode 100644 loadable/loadable.ld

diff --git a/Makefile b/Makefile
index 7bbacb5..c265fdd 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,7 @@ INCLUDE_PATHS = -I$(ROOT_PATH) -I$(ROOT_PATH)/core
 
 include $(ROOT_PATH)/Makefile.inc
 
+LDFLAGS+= -Wl,--gc-sections
 VPATH += lpc1xxx
 OBJS += $(TARGET)_handlers.o LPC1xxx_startup.o
 
@@ -36,8 +37,27 @@ LD_PATH = lpc1xxx
 LD_SCRIPT = $(LD_PATH)/linkscript.ld
 LD_TEMP = $(LD_PATH)/memory.ld
 
+### User targets:
+
 all: $(OUTFILE).bin
 
+protect: $(OUTFILE).bin
+	$(LPCFIX) -p 2 $(OUTFILE).bin
+
+loadables: $(OUTFILE).elf
+	@cd loadable && $(MAKE)
+
+clean:
+	rm -f $(OBJS) $(LD_TEMP) $(OUTFILE).elf $(OUTFILE).bin $(OUTFILE).hex
+	@cd core && $(MAKE) clean
+	@cd tools && $(MAKE) clean
+	@cd lcd && $(MAKE) clean
+	@cd modules && $(MAKE) clean
+	@cd filesystem && $(MAKE) clean
+	@cd loadable && $(MAKE) clean
+
+### Internal targets
+
 %.o : %.c
 	$(CC) $(CFLAGS) -o $@ $<
 
@@ -56,32 +76,24 @@ filesystem/libfat.a:
 tools/lpcfix:
 	cd tools && $(MAKE) 
 
-$(OUTFILE).bin: $(OBJS) $(SYS_OBJS) $(LIBS) $(LPCFIX)
+$(LD_TEMP):
 	-@echo "MEMORY" > $(LD_TEMP)
 	-@echo "{" >> $(LD_TEMP)
 	-@echo "  flash(rx): ORIGIN = 0x00000000, LENGTH = $(FLASH)" >> $(LD_TEMP)
-	-@echo "  sram(rwx): ORIGIN = 0x10000000+$(SRAM_USB), LENGTH = $(SRAM)-$(SRAM_USB)" >> $(LD_TEMP)
+	-@echo "  sram(rwx): ORIGIN = 0x10000000+$(SRAM_USB), LENGTH = $(SRAM)-$(SRAM_USB)-$(RAMCODE)" >> $(LD_TEMP)
 	-@echo "}" >> $(LD_TEMP)
 	-@echo "INCLUDE $(LD_SCRIPT)" >> $(LD_TEMP)
-	$(LD) $(LDFLAGS) -T $(LD_TEMP) -o $(OUTFILE).elf $(OBJS) $(LDLIBS)
+
+$(OUTFILE).elf: $(OBJS) $(SYS_OBJS) $(LIBS) $(LPCFIX) $(LD_TEMP)
+	$(CC) $(LDFLAGS) -T $(LD_TEMP) -o $(OUTFILE).elf $(OBJS) $(LDLIBS)
 	-@echo ""
 	$(SIZE) $(OUTFILE).elf
 	-@echo ""
-	$(OBJCOPY) $(OCFLAGS) -O binary $(OUTFILE).elf $(OUTFILE).bin
+
+%.bin: %.elf
+	$(OBJCOPY) $(OCFLAGS) -O binary $< $@
 	-@echo ""
-	$(LPCFIX) -c $(OUTFILE).bin
+	$(LPCFIX) -c $@
 
-protect: $(OUTFILE).bin
-	$(LPCFIX) -p 2 $(OUTFILE).bin
-
-clean:
-	rm -f $(OBJS) $(LD_TEMP) $(OUTFILE).elf $(OUTFILE).bin $(OUTFILE).hex
-	@cd core && $(MAKE) clean
-	@cd tools && $(MAKE) clean
-	@cd lcd && $(MAKE) clean
-	@cd modules && $(MAKE) clean
-	@cd filesystem && $(MAKE) clean
-
-
-.PHONY: lcd/liblcd.a modules/libmodules.a filesystem/libfat.a
+.PHONY: $(LD_TEMP) lcd/liblcd.a modules/libmodules.a filesystem/libfat.a
 
diff --git a/Makefile.inc b/Makefile.inc
index 82a84d4..6762cdd 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -7,6 +7,7 @@
 TARGET = LPC13xx
 FLASH = 32K
 SRAM = 8K
+RAMCODE=1K
 
 # For USB HID support the LPC134x reserves 384 bytes from the sram,
 # if you don't want to use the USB features, just use 0 here.
@@ -19,7 +20,8 @@ SRAM_USB = 384
 CROSS_COMPILE = arm-none-eabi-
 AS = $(CROSS_COMPILE)gcc
 CC = $(CROSS_COMPILE)gcc
-LD = $(CROSS_COMPILE)gcc
+LD = $(CROSS_COMPILE)ld
+REALLD = $(CROSS_COMPILE)ld
 SIZE = $(CROSS_COMPILE)size
 OBJCOPY = $(CROSS_COMPILE)objcopy
 OBJDUMP = $(CROSS_COMPILE)objdump
@@ -39,5 +41,5 @@ CPU_TYPE = cortex-$(CORTEX_TYPE)
 ##########################################################################
 
 CFLAGS  = -std=c99 -c -g -Os $(INCLUDE_PATHS) -Wall -mthumb -ffunction-sections -fdata-sections -fmessage-length=0 -mcpu=$(CPU_TYPE) -DTARGET=$(TARGET) -fno-builtin
-LDFLAGS = -nostartfiles -mthumb -mcpu=$(CPU_TYPE) -Wl,--gc-sections
+LDFLAGS = -nostartfiles
 
diff --git a/loadable/.gitignore b/loadable/.gitignore
new file mode 100644
index 0000000..60ca729
--- /dev/null
+++ b/loadable/.gitignore
@@ -0,0 +1,3 @@
+*.elf
+*.bin
+*.h
diff --git a/loadable/Makefile b/loadable/Makefile
new file mode 100644
index 0000000..fa86f1e
--- /dev/null
+++ b/loadable/Makefile
@@ -0,0 +1,12 @@
+# Make doesn't allow dependencies on parent directory, so we need to
+# run make from one level up:
+
+MAKEFILE=loadable/Makefile.sub
+MAKE+=--no-print-directory
+
+all:
+	@cd .. && $(MAKE) -f $(MAKEFILE)
+
+clean:
+	@cd .. && $(MAKE) -f $(MAKEFILE) clean
+	
diff --git a/loadable/Makefile.sub b/loadable/Makefile.sub
new file mode 100644
index 0000000..a4763af
--- /dev/null
+++ b/loadable/Makefile.sub
@@ -0,0 +1,47 @@
+DIR?= loadable
+
+##########################################################################
+# User configuration and firmware specific object files	
+##########################################################################
+SRCS = $(wildcard $(DIR)/*.c)
+OBJS = $(foreach mod,$(SRCS),$(subst .c,.o,$(mod)))
+ELFS = $(foreach mod,$(SRCS),$(subst .c,.elf,$(mod)))
+BINS = $(foreach mod,$(SRCS),$(subst .c,.bin,$(mod)))
+HDRS = $(foreach mod,$(SRCS),$(subst .c,.h,$(mod)))
+
+##########################################################################
+# GNU GCC compiler flags
+##########################################################################
+ROOT_PATH?= .
+
+INCLUDE_PATHS = -I$(ROOT_PATH) -I$(ROOT_PATH)/core
+
+include $(ROOT_PATH)/Makefile.inc
+
+##########################################################################
+# Compiler settings, parameters and flags
+##########################################################################
+FIRMWARE=$(ROOT_PATH)/$(OUTFILE).elf
+LDFILE=$(DIR)/loadable.ld
+CFLAGS+=-mlong-calls
+LDFLAGS+= -R $(FIRMWARE)
+
+all: $(OBJS) $(ELFS) $(BINS) $(HDRS)
+
+%.o : %.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+%.elf: %.o $(FIRMWARE) $(LDFILE)
+	$(LD) $(LDFLAGS) -T $(LDFILE) -o $@ $<
+	$(SIZE) $@
+
+%.bin: %.elf
+	$(OBJCOPY) $(OCFLAGS) -O binary $< $@
+
+%.h: %.bin $(DIR)/bin2h.pl
+	$(DIR)/bin2h.pl $<
+    
+clean:
+	cd $(DIR) && rm -f *.o *.elf *.bin
+
+.SUFFIXES:
diff --git a/loadable/bin2h.pl b/loadable/bin2h.pl
new file mode 100755
index 0000000..185bc54
--- /dev/null
+++ b/loadable/bin2h.pl
@@ -0,0 +1,41 @@
+#!/usr/bin/perl
+#
+# vim:set ts=4 sw=4:
+
+use strict;
+
+sub dwim{
+	local $/=undef;
+	my $file=shift;
+
+	open(IN,"<:bytes",$file) || die "Can't open $file: $!";
+	my @bytes=unpack("C*",<IN>);
+	close(IN);
+
+	$file=~s/\.[^.]+$//;
+
+	open(OUT,">","${file}.h") || die "Can't write ${file}.h: $!";
+
+    $file=~s!.*/!!;
+
+	print OUT "const uint16_t loadable_${file}_size = ", scalar @bytes, ";\n";
+	print OUT "const uint8_t loadable_${file}[] = {\n";
+
+	my $ctr=0;
+	for(@bytes){
+		print OUT "\t" if($ctr==0);
+		printf OUT "0x%02x, ",$_;
+		if(++$ctr==8){
+			print OUT "\n";
+			$ctr=0;
+		};
+	};
+	print OUT "\n" if($ctr!=0);
+
+	print OUT "};\n";
+	close(OUT);
+};
+
+for(@ARGV){
+	dwim($_);
+};
diff --git a/loadable/blinktest.c b/loadable/blinktest.c
new file mode 100644
index 0000000..7530f14
--- /dev/null
+++ b/loadable/blinktest.c
@@ -0,0 +1,10 @@
+#include <sysinit.h>
+
+#include "basic/basic.h"
+
+void ram(void){
+	for (int x=0;x<20;x++){
+		gpioSetValue (RB_LED1, x%2); 
+		delayms(50);
+	};
+};
diff --git a/loadable/loadable.ld b/loadable/loadable.ld
new file mode 100644
index 0000000..2666465
--- /dev/null
+++ b/loadable/loadable.ld
@@ -0,0 +1,52 @@
+MEMORY
+{
+  sram(rwx): ORIGIN = 0x10001800, LENGTH = 2K
+}
+
+
+sram_top = ORIGIN(sram) + LENGTH(sram);
+ENTRY(boot_entry)
+
+SECTIONS
+{
+  .text :
+  {
+    *(.text*)
+    *(.rodata*)
+  } > sram
+
+  /*
+   * More information about Special Section Indexes is available in the
+   * free "ELF for the ARM Architecture" document from ARM Limited
+   * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf
+   *
+   */
+  .ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } > sram
+  __exidx_start = .;
+  .ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } > sram
+  __exidx_end = .;
+
+  _etext = .;
+    
+  .data : AT (__exidx_end)
+  {
+    _data = .;
+    *(vtable)
+    *(.data*)
+    _edata = .;
+  } > sram
+
+  /* zero initialized data */
+  .bss :
+  {
+    _bss = .;
+    *(.bss*)
+    *(COMMON)
+    _ebss = .;
+  } > sram
+  
+  end = .;
+
+  /* For GDB compatibility we decrease the top with 16 bytes */
+  stack_entry = sram_top - 16;
+}