From de238503d261f423af37430af377caa7b9588a0e Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Sat, 5 Jul 2014 19:39:05 +0200
Subject: [PATCH] devices/runtime: use regular function call instead of syscall

---
 artiq/devices/runtime.py | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/artiq/devices/runtime.py b/artiq/devices/runtime.py
index 5d5aa764c..628f68c56 100644
--- a/artiq/devices/runtime.py
+++ b/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)