first commit, basic setup and makefile

diff --git a/Makefile b/Makefile
new file mode 100644 (file)
index 0000000..cc01e47
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,33 @@
+CC=$(TOOLROOT)/arm-none-eabi-gcc
+LD=arm-none-eabi-ld
+AR=$(TOOLROOT)/arm-none-eabi-ar
+AS=arm-none-eabi-as
+MKIMG=arm-none-eabi-objcopy
+
+LDFLAGS+= -mthumb -mcpu=cortex-m3 
+CFLAGS+= -mcpu=cortex-m3 -mthumb 
+
+as: 
+       $(AS) $(CFLAGS) -o start.o start.asm
+
+all:
+       $(AS) $(CFLAGS) -o start.o start.asm
+       $(LD) -T link.ld -o start.out start.o
+       $(MKIMG) -Obinary start.out kernel.bin
+
+run:
+       qemu-system-arm -monitor stdio -M lm3s6965evb -kernel kernel.bin
+
+examine:
+       arm-none-eabi-objdump -S start.out
+
+%.o: %.c
+       $(CC) -c $(CFLAGS) $< -o $@
+       $(CC) -MM $(CFLAGS) $< > $*.d
+
+%.o: %.s
+       $(CC) -c $(CFLAGS) $< -o $@
+
+
+
+

diff --git a/link.ld b/link.ld
new file mode 100644 (file)
index 0000000..00ce90e
--- /dev/null
+++ b/link.ld
@@ -0,0 +1,21 @@
+MEMORY
+{
+       FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 512K
+       SRAM (xrw) : ORIGIN = 0x20000000, LENGTH = 64K
+}
+
+ENTRY(_start)
+
+SECTIONS
+{
+       .text : ALIGN(4)
+       {
+               /* (.vector_table */ 
+               *(.text)
+
+       } > FLASH
+       .data : 
+       {
+               *(.data)
+       } > SRAM
+}

diff --git a/start.asm b/start.asm
new file mode 100644 (file)
index 0000000..8991594
--- /dev/null
+++ b/start.asm
@@ -0,0 +1,22 @@
+       .equ STACK_TOP, 0x20000800
+       .text
+       .global _start
+       .code 16
+       .syntax unified
+_start:
+       .word STACK_TOP, start
+       .type start, function
+
+/* Start of main program */
+start:
+       movs r0, #10
+       movs r1, #5
+loop:
+       adds r1, r0
+       subs r0, #1
+       bne loop
+/* Result is now in R1 */
+deadloop:
+       b deadloop
+       .end
+