fernly: Initial commit

This is an initial commit of the code.  It just does prints "Hello, world!"

.gitignore

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+/build
+*.swp
+*.swo

Makefile

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+include mkenv.mk
+include magic.mk
+
+CFLAGS = -mtune=arm7tdmi -mcpu=arm7tdmi -mfloat-abi=soft -Wall \
+	 -O0 -ggdb -Iinclude
+
+LDFLAGS = --nostdlib -T fernvale.ld
+LIBS =
+
+SRC_C = \
+	main.c \
+	vectors.c \
+	serial.c
+
+SRC_S = \
+	start.S
+
+OBJ = $(addprefix $(BUILD)/, $(SRC_S:.S=.o) $(SRC_C:.c=.o))
+
+all: $(BUILD)/firmware.bin
+clean:
+	$(RM) -rf $(BUILD)
+
+HEADER_BUILD = $(BUILD)/genhdr
+$(BUILD)/firmware.bin: $(BUILD)/firmware.elf
+	objcopy -S -O binary $(BUILD)/firmware.elf $@
+
+$(BUILD)/firmware.elf: $(OBJ)
+	$(LD) $(LDFLAGS) --entry=reset_handler -o $@ $(OBJ) $(LIBS)
+
+$(OBJ): $(HEADER_BUILD)/generated.h | $(OBJ_DIRS)
+$(HEADER_BUILD)/generated.h: | $(HEADER_BUILD)
+	  touch $@
+
+OBJ_DIRS = $(sort $(dir $(OBJ)))
+$(OBJ_DIRS):
+	$(MKDIR) -p $@
+$(HEADER_BUILD):
+	$(MKDIR) -p $@
+-include $(OBJ:.o=.P)

README.md

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+Fernly - Fernvale Reversing OS
+========================================
+
+Fernly is a simple operating system designed for use in the reverse engineering
+of the Fernvale CPU.  It will likely be disposed of when the system has been
+understood well enough to implement a full operating system.
+
+
+Usage
+-----
+
+To compile, simply run "make".
+
+To install, use radare2:
+
+    $ sudo radare2 fv://
+    [0x00000000]> s 0x3460
+    [0x00003460]> wf .//build/firmware.bin 
+

fernvale.ld

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+/************************************************************
+ * configs/c5471evm/scripts/ld.script
+ *
+ *   Copyright (C) 2007, 2011-2012, 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+OUTPUT_ARCH(arm)
+ENTRY(_stext)
+SECTIONS
+{
+	/* The OS entry point is here */
+
+	. = 0x10003460;
+	.text : {
+		_stext = ABSOLUTE(.);
+		KEEP(*(vectors))
+		*(.text)
+		*(.fixup)
+		*(.gnu.warning)
+		*(.rodata)
+		*(.glue_7)
+		*(.glue_7t)
+		*(.got)			/* Global offset table		*/
+		_etext = ABSOLUTE(.);
+	}
+
+	_eronly = ABSOLUTE(.);		/* See below                    */
+	. = ALIGN(4096);
+
+	.data : {
+		_sdata = ABSOLUTE(.);
+		*(.data)
+		CONSTRUCTORS
+		_edata = ABSOLUTE(.);
+	}
+
+	.bss : {			/* BSS				*/
+		_sbss = ABSOLUTE(.);
+		*(.bss)
+		*(COMMON)
+		_ebss = ABSOLUTE(.);
+	}
+					/* Stabs debugging sections.	*/
+	.stab 0 : { *(.stab) }
+	.stabstr 0 : { *(.stabstr) }
+	.stab.excl 0 : { *(.stab.excl) }
+	.stab.exclstr 0 : { *(.stab.exclstr) }
+	.stab.index 0 : { *(.stab.index) }
+	.stab.indexstr 0 : { *(.stab.indexstr) }
+	.comment 0 : { *(.comment) }
+	.debug_abbrev 0 : { *(.debug_abbrev) }
+	.debug_info 0 : { *(.debug_info) }
+	.debug_line 0 : { *(.debug_line) }
+	.debug_pubnames 0 : { *(.debug_pubnames) }
+	.debug_aranges 0 : { *(.debug_aranges) }
+}

include/gnu/stubs-soft.h

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+/* This file is automatically generated.
+   It defines a symbol `__stub_FUNCTION' for each function
+   in the C library which is a stub, meaning it will fail
+   every time called, usually setting errno to ENOSYS.  */
+
+#ifdef _LIBC
+# error Applications may not define the macro _LIBC
+#endif
+
+#define __stub_chflags
+#define __stub_create_module
+#define __stub_fattach
+#define __stub_fchflags
+#define __stub_fdetach
+#define __stub_get_kernel_syms
+#define __stub_getmsg
+#define __stub_getpmsg
+#define __stub_gtty
+#define __stub_lchmod
+#define __stub_putmsg
+#define __stub_putpmsg
+#define __stub_query_module
+#define __stub_revoke
+#define __stub_setlogin
+#define __stub_sigreturn
+#define __stub_sstk
+#define __stub_stty

include/serial.h

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+#ifndef __UART_H__
+#define __UART_H__
+
+#include <stdint.h>
+
+int uart_putc(uint8_t c);
+int uart_puts(char *s);
+
+#endif /* __UART_H__ */

magic.mk

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+# This file expects that OBJ contains a list of all of the object files.
+# The directory portion of each object file is used to locate the source
+# and should not contain any ..'s but rather be relative to the top of the 
+# tree.
+#
+# So for example, py/map.c would have an object file name py/map.o
+# The object files will go into the build directory and mantain the same
+# directory structure as the source tree. So the final dependency will look
+# like this:
+#
+# build/py/map.o: py/map.c
+#
+# We set vpath to point to the top of the tree so that the source files
+# can be located. By following this scheme, it allows a single build rule
+# to be used to compile all .c files.
+
+vpath %.S . $(TOP)
+$(BUILD)/%.o: %.S
+	$(ECHO) "CC $<"
+	$(Q)$(CC) $(CFLAGS) -c -o $@ $<
+
+vpath %.s . $(TOP)
+$(BUILD)/%.o: %.s
+	$(ECHO) "AS $<"
+	$(Q)$(AS) -o $@ $<
+
+define compile_c
+$(ECHO) "CC $<"
+$(Q)$(CC) $(CFLAGS) -c -MD -o $@ $<
+@# The following fixes the dependency file.
+@# See http://make.paulandlesley.org/autodep.html for details.
+@$(CP) $(@:.o=.d) $(@:.o=.P); \
+  $(SED) -e 's/#.*//' -e 's/^[^:]*: *//' -e 's/ *\\$$//' \
+      -e '/^$$/ d' -e 's/$$/ :/' < $(@:.o=.d) >> $(@:.o=.P); \
+  $(RM) -f $(@:.o=.d)
+endef
+
+vpath %.c . $(TOP)
+$(BUILD)/%.o: %.c
+	$(call compile_c)
+
+$(BUILD)/%.pp: %.c
+	$(ECHO) "PreProcess $<"
+	$(Q)$(CC) $(CFLAGS) -E -Wp,-C,-dD,-dI -o $@ $<

main.c

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+#include "serial.h"
+
+int main(int argc, char **argv) {
+	while(1) {
+		int i;
+		uart_puts("Hello, world!\n");
+		for (i = 0; i < 0xf000; i++);
+	}
+	return 0;
+}

mkenv.mk

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+ifneq ($(lastword a b),b)
+$(error These Makefiles require make 3.81 or newer)
+endif
+
+# Set TOP to be the path to get from the current directory (where make was
+# invoked) to the top of the tree. $(lastword $(MAKEFILE_LIST)) returns
+# the name of this makefile relative to where make was invoked.
+#
+# We assume that this file is in the py directory so we use $(dir ) twice
+# to get to the top of the tree.
+
+THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
+TOP := $(patsubst %/py/mkenv.mk,%,$(THIS_MAKEFILE))
+
+# Turn on increased build verbosity by defining BUILD_VERBOSE in your main
+# Makefile or in your environment. You can also use V=1 on the make command
+# line.
+
+ifeq ("$(origin V)", "command line")
+BUILD_VERBOSE=$(V)
+endif
+ifndef BUILD_VERBOSE
+BUILD_VERBOSE = 0
+endif
+ifeq ($(BUILD_VERBOSE),0)
+Q = @
+else
+Q =
+endif
+# Since this is a new feature, advertise it
+ifeq ($(BUILD_VERBOSE),0)
+$(info Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.)
+endif
+
+# default settings; can be overriden in main Makefile
+
+BUILD ?= build
+
+RM = rm
+ECHO = @echo
+CP = cp
+MKDIR = mkdir
+SED = sed
+PYTHON = python
+
+AS = $(CROSS_COMPILE)as
+CC = $(CROSS_COMPILE)clang
+LD = $(CROSS_COMPILE)ld
+OBJCOPY = $(CROSS_COMPILE)objcopy
+SIZE = $(CROSS_COMPILE)size
+STRIP = $(CROSS_COMPILE)strip
+
+all:
+.PHONY: all
+
+.DELETE_ON_ERROR:
+
+MKENV_INCLUDED = 1

serial.c

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+#include <stdint.h>
+#include "serial.h"
+
+int uart_putc(uint8_t c) {
+	uint32_t *uart_ldr = (uint32_t *)0xa0080014;
+	uint32_t *uart_sbr = (uint32_t *)0xa0080000;
+	/* Wait for UART to be empty */
+	while (! (*uart_ldr & 0x20));
+	*uart_sbr = c;
+	return 0;
+}
+
+int uart_puts(char *s) {
+	while(*s) {
+		if (*s == '\n')
+			uart_putc('\r');
+		uart_putc(*s++);
+	}
+	return 0;
+}

start.S

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+.section vectors
+	b	do_reset
+	b	do_undef
+	b	do_swi
+	b	do_prefetch_abort
+	b	do_data_abort
+	b	do_reserved
+	b	do_irq
+	b	do_fiq
+
+do_reset:
+	b	reset_handler
+do_undef:
+	b	undef_handler
+do_swi:
+	b	swi_handler
+do_prefetch_abort:
+	b	prefetch_abort_handler
+do_data_abort:
+	b	data_abort_handler
+do_reserved:
+	b	reserved_handler
+do_irq:
+	b	irq_handler
+do_fiq:
+	b	fiq_handler
+
+.text
+
+.global other
+other:
+	add r1, r2, r1
+	bx lr
+
+.global __start
+__start:
+	add r3, r2, r3
+	bx lr
+
+.global _start
+_start:
+	add r4, r3, r4
+	bx lr
+
+.global other2
+other2:
+	add r5, r4, r5
+	bx lr
+

vectors.c

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+
+void reset_handler(void) {
+	extern int main(int argc, char **argv);
+	main(1, 0);
+	return;
+}
+
+void undef_handler(void) {
+	return;
+}
+
+void swi_handler(void) {
+	return;
+}
+
+void prefetch_abort_handler(void) {
+	return;
+}
+
+void data_abort_handler(void) {
+	return;
+}
+
+void reserved_handler(void) {
+	return;
+}
+
+void irq_handler(void) {
+	return;
+}
+
+void fiq_handler(void) {
+	return;
+}