1 files changed, 59 insertions, 0 deletions
diff --git a/lib/arch/arch.nim b/lib/arch/arch.nim
new file mode 100644
index 000000000..a11bfb21f
--- /dev/null
+++ b/lib/arch/arch.nim
@@ -0,0 +1,59 @@
+#
+#
+#            Nim's Runtime Library
+#        (c) Copyright 2015 Rokas Kupstys
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+when defined(windows):
+  const
+    ABI* = "ms"
+elif defined(unix):
+  const
+    ABI* = "unix"
+else:
+  {.error: "Unsupported ABI".}
+
+when defined(amd64):
+  when defined(unix):
+    # unix (sysv) ABI
+    type
+      JmpBufReg* {.pure.} = enum
+        BX, BP, R12, R13, R14, R15, SP, IP, TOTAL
+  elif defined(windows):
+    # ms ABI
+    type
+      JmpBufReg* {.pure.} = enum
+        BX, BP, R12, R13, R14, R15, SP, IP, SI, DI, TOTAL
+  type
+    Reg* {.pure.} = enum
+      AX, BX, CX, DX, SI, DI, BP, SP, IP, R8, R9, R10, R11, R12, R13, R14, R15, TOTAL
+
+elif defined(i386):
+    # identical fastcall calling convention on all x86 OS
+    type
+      JmpBufReg* {.pure.} = enum
+        BX, SI, DI, BP, SP, IP, TOTAL
+
+      Reg* {.pure.} = enum
+        AX, BX, CX, BP, SP, DI, SI, TOTAL
+
+else:
+  {.error: "Unsupported architecture".}
+
+{.compile: "./" & ABI & "_" & hostCPU & ".asm"}
+
+type
+  JmpBuf* = array[JmpBufReg.TOTAL, pointer]
+  Registers* = array[Reg.TOTAL, pointer]
+
+
+proc getRegisters*(ctx: var Registers) {.importc: "narch_$1", fastcall.}
+
+proc setjmp*(ctx: var JmpBuf): int {.importc: "narch_$1", fastcall.}
+proc longjmp*(ctx: JmpBuf, ret=1) {.importc: "narch_$1", fastcall.}
+
+proc coroSwitchStack*(sp: pointer) {.importc: "narch_$1", fastcall.}
+proc coroRestoreStack*() {.importc: "narch_$1", fastcall.}