all: move generic ARM bits into separate files

src/runtime/runtime_arm.go

@@ -0,0 +1,55 @@
+/// +build arm
+
+package runtime
+
+import (
+	"device/arm"
+	"unsafe"
+)
+
+//go:extern _sbss
+var _sbss unsafe.Pointer
+
+//go:extern _ebss
+var _ebss unsafe.Pointer
+
+//go:extern _sdata
+var _sdata unsafe.Pointer
+
+//go:extern _sidata
+var _sidata unsafe.Pointer
+
+//go:extern _edata
+var _edata unsafe.Pointer
+
+func preinit() {
+	// Initialize .bss: zero-initialized global variables.
+	ptr := uintptr(unsafe.Pointer(&_sbss))
+	for ptr != uintptr(unsafe.Pointer(&_ebss)) {
+		*(*uint32)(unsafe.Pointer(ptr)) = 0
+		ptr += 4
+	}
+
+	// Initialize .data: global variables initialized from flash.
+	src := uintptr(unsafe.Pointer(&_sidata))
+	dst := uintptr(unsafe.Pointer(&_sdata))
+	for dst != uintptr(unsafe.Pointer(&_edata)) {
+		*(*uint32)(unsafe.Pointer(dst)) = *(*uint32)(unsafe.Pointer(src))
+		dst += 4
+		src += 4
+	}
+}
+
+func postinit() {
+}
+
+func abort() {
+	for {
+		arm.Asm("wfi")
+	}
+}
+
+// Align on word boundary.
+func align(ptr uintptr) uintptr {
+	return (ptr + 3) &^ 3
+}

src/runtime/runtime_nrf.go

@@ -5,7 +5,6 @@ package runtime
 import (
 	"device/arm"
 	"device/nrf"
-	"unsafe"
 )
 
 type timeUnit int64
@@ -21,42 +20,6 @@ func handleReset() {
 	main()
 }
 
-//go:extern _sbss
-var _sbss unsafe.Pointer
-
-//go:extern _ebss
-var _ebss unsafe.Pointer
-
-//go:extern _sdata
-var _sdata unsafe.Pointer
-
-//go:extern _sidata
-var _sidata unsafe.Pointer
-
-//go:extern _edata
-var _edata unsafe.Pointer
-
-func preinit() {
-	// Initialize .bss: zero-initialized global variables.
-	ptr := uintptr(unsafe.Pointer(&_sbss))
-	for ptr != uintptr(unsafe.Pointer(&_ebss)) {
-		*(*uint32)(unsafe.Pointer(ptr)) = 0
-		ptr += 4
-	}
-
-	// Initialize .data: global variables initialized from flash.
-	src := uintptr(unsafe.Pointer(&_sidata))
-	dst := uintptr(unsafe.Pointer(&_sdata))
-	for dst != uintptr(unsafe.Pointer(&_edata)) {
-		*(*uint32)(unsafe.Pointer(dst)) = *(*uint32)(unsafe.Pointer(src))
-		dst += 4
-		src += 4
-	}
-}
-
-func postinit() {
-}
-
 func init() {
 	initUART()
 	initLFCLK()
@@ -118,17 +81,6 @@ func ticks() timeUnit {
 	return timestamp
 }
 
-func abort() {
-	for {
-		arm.Asm("wfi")
-	}
-}
-
-// Align on word boundary.
-func align(ptr uintptr) uintptr {
-	return (ptr + 3) &^ 3
-}
-
 type __volatile bool
 
 var rtc_wakeup __volatile

targets/arm.ld

@@ -1,12 +1,4 @@
 
-MEMORY
-{
-    FLASH_TEXT (rw) : ORIGIN = 0x00000000, LENGTH = 256K /* .text */
-    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 64K
-}
-
-_stack_size = 2K;
-
 /* define output sections */
 SECTIONS
 {

targets/nrf52.ld

@@ -0,0 +1,10 @@
+
+MEMORY
+{
+    FLASH_TEXT (rw) : ORIGIN = 0x00000000, LENGTH = 256K /* .text */
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 64K
+}
+
+_stack_size = 2K;
+
+INCLUDE "targets/arm.ld"

targets/pca10040.json

@@ -1,8 +1,8 @@
 {
 	"llvm-target": "armv7em-none-eabi",
-	"build-tags": ["nrf", "nrf52", "nrf52832", "js", "wasm"],
+	"build-tags": ["nrf", "nrf52", "nrf52832", "arm", "js", "wasm"],
 	"linker": "arm-none-eabi-gcc",
-	"pre-link-args": ["-nostdlib", "-nostartfiles", "-mcpu=cortex-m4", "-mthumb", "-T", "targets/arm.ld", "-Wl,--gc-sections", "-fno-exceptions", "-fno-unwind-tables", "-ffunction-sections", "-fdata-sections", "-Os", "-DNRF52832_XXAA", "-Ilib/CMSIS/CMSIS/Include", "lib/nrfx/mdk/system_nrf52.c", "src/device/nrf/nrf52.s"],
+	"pre-link-args": ["-nostdlib", "-nostartfiles", "-mcpu=cortex-m4", "-mthumb", "-T", "targets/nrf52.ld", "-Wl,--gc-sections", "-fno-exceptions", "-fno-unwind-tables", "-ffunction-sections", "-fdata-sections", "-Os", "-DNRF52832_XXAA", "-Ilib/CMSIS/CMSIS/Include", "lib/nrfx/mdk/system_nrf52.c", "src/device/nrf/nrf52.s"],
 	"objcopy": "arm-none-eabi-objcopy",
 	"flash": "nrfjprog -f nrf52 --sectorerase --program {hex} --reset"
 }