devices/runtime: use regular function call instead of syscall

artiq/devices/runtime.py

@@ -1,22 +1,16 @@
 from llvm import core as lc
 
-syscall_map = {
-	"rpc":				0,
-	"rtio_set":			1,
-	"rtio_sync":		2,
-	"dds_program":		3,
-}
+_syscalls = [
+	("printint", lc.Type.void(), [lc.Type.int()])
+]
 
 class Environment:
+	def __init__(self, module):
+		for func_name, func_type_ret, func_type_args in _syscalls:
+			function_type = lc.Type.function(func_type_ret, func_type_args)
+			module.add_function(function_type, "__syscall_"+func_name)
+
+		self.module = module
+
 	def emit_syscall(self, builder, syscall_name, args):
-		syscall_nr = syscall_map[syscall_name]
-
-		assert(0 <= syscall_nr <= 0xffff)
-		# FIXME: replace with "l.sys syscall_nr" after the LLVM problems are fixed
-		opcode = 0x20000000 | syscall_nr
-		asm_string = "\n".join(".byte 0x{:02x}".format((opcode >> 8*i) & 0xff)
-			for i in reversed(range(4)))
-
-		sc_type = lc.Type.function(lc.Type.void(), [])
-		asm = lc.InlineAsm.get(sc_type, asm_string, "")
-		builder.call(asm, [])
+		builder.call(self.module.get_function_named("__syscall_"+syscall_name), args)