stm32: initial support

targets/bluepill.json

@@ -0,0 +1,8 @@
+{
+	"llvm-target": "armv7m-none-eabi",
+	"build-tags": ["stm32", "stm32f103xx", "arm", "js", "wasm"],
+	"linker": "arm-none-eabi-gcc",
+	"pre-link-args": ["-nostdlib", "-nostartfiles", "-mcpu=cortex-m3", "-mthumb", "-T", "targets/stm32.ld", "-Wl,--gc-sections", "-fno-exceptions", "-fno-unwind-tables", "-ffunction-sections", "-fdata-sections", "-Os", "src/device/stm32/stm32f103xx.s"],
+	"objcopy": "arm-none-eabi-objcopy",
+	"flash": "openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c 'program {hex} reset exit'"
+}

targets/stm32.ld

@@ -0,0 +1,10 @@
+
+MEMORY
+{
+    FLASH_TEXT (rw) : ORIGIN = 0x08000000, LENGTH = 64K
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+_stack_size = 2K;
+
+INCLUDE "targets/arm.ld"