added sbst programs

Makefile

@@ -1,4 +1,10 @@
 
+#
+# picorv32 / sbst config
+#
+
+SBST_SRCS := $(wildcard sbst_programs/*.c)
+
 #
 # jpeg_core config
 #
@@ -21,7 +27,7 @@ JPEG_CORE_TB     := jpeg_core_tb.v
 all: $(JPEG_CORE_VVP)
 
 clean:
-	rm -f $(JPEG_CORE_VVP) $(JPEG_CORE_OUTFILE) *.vcd
+	rm -f $(JPEG_CORE_VVP) $(JPEG_CORE_OUTFILE) *.vcd $(SBST_SRCS:.c=.bin) $(SBST_SRCS:.c=.hex)
 
 #
 # jpeg_core targets
@@ -45,4 +51,15 @@ test_ez_vcd:
 	make -C picorv32 test_ez_vcd
 
 testbench.npy:
-	./picorv32_vcd_import.py picorv32/testbench.vcd testbench.npy
+	./picorv32_vcd_import.py picorv32/testbench.vcd testbench.npy
+
+sbst_programs: $(SBST_SRCS:.c=.bin) $(SBST_SRCS:.c=.hex)
+
+sbst_programs/%.elf: sbst_programs/%.c sbst_programs/start.S
+	riscv64-unknown-elf-gcc -march=rv32ima_zicsr -mabi=ilp32 -ffreestanding -O0 -nostdlib -o $@ $^ -T picorv32/firmware/riscv.ld
+
+sbst_programs/%.bin: sbst_programs/%.elf
+	riscv64-unknown-elf-objcopy -O binary $^ $@
+
+sbst_programs/%.hex: sbst_programs/%.bin
+	python3 -c "import os; d=open('$^','rb').read(); [print('{:02x}{:02x}{:02x}{:02x}'.format(d[i+3],d[i+2],d[i+1],d[i])) for i in range(0,len(d),4)]" > $@