Coroutine support for i386/amd64 platforms unix/windows OSes markAndSweep/refCounting GCs.

lib/arch/i386.asm

@@ -0,0 +1,79 @@
+;
+;
+;            Nim's Runtime Library
+;        (c) Copyright 2015 Rokas Kupstys
+;
+;    See the file "copying.txt", included in this
+;    distribution, for details about the copyright.
+;
+
+section ".text" executable
+public narch_getRegisters
+public @narch_getRegisters@4
+public narch_setjmp
+public @narch_setjmp@4
+public narch_longjmp
+public @narch_longjmp@8
+public narch_coroSwitchStack
+public @narch_coroSwitchStack@4
+public narch_coroRestoreStack
+public @narch_coroRestoreStack@0
+
+@narch_getRegisters@4:
+narch_getRegisters:
+    mov   [ecx], eax
+    mov   [ecx+4], ebx
+    mov   [ecx+8], ecx
+    mov   [ecx+0Ch], ebp
+    mov   [ecx+10h], esp
+    mov   [ecx+14h], edi
+    mov   [ecx+18h], esi
+    ret
+
+
+@narch_setjmp@4:
+narch_setjmp:
+    ; Based on code from musl libc Copyright © 2005-2014 Rich Felker, et al.
+    mov  [ecx], ebx
+    mov  [ecx+4], esi
+    mov  [ecx+8], edi
+    mov  [ecx+0Ch], ebp
+    lea  eax, [esp+4]
+    mov  [ecx+10h], eax
+    mov  eax, [esp]
+    mov  [ecx+14h], eax
+    xor  eax, eax
+    ret
+
+
+@narch_longjmp@8:
+narch_longjmp:
+    ; Based on code from musl libc Copyright © 2005-2014 Rich Felker, et al.
+    mov  eax, edx
+    test eax, eax
+    jnz  @F
+    inc  eax
+@@:
+    mov  ebx, [ecx]
+    mov  esi, [ecx+4]
+    mov  edi, [ecx+8]
+    mov  ebp, [ecx+0Ch]
+    mov  esp, [ecx+10h]
+    mov  edx, [ecx+14h]
+    jmp  edx
+
+
+@narch_coroSwitchStack@4:
+narch_coroSwitchStack:
+    pop eax                   ; return address
+    mov edx, esp              ; old esp for saving
+    mov esp, ecx              ; swap stack with one passed to func
+    push edx                  ; store old stack pointer on newly switched stack
+    jmp eax                   ; return
+
+
+@narch_coroRestoreStack@0:
+narch_coroRestoreStack:
+    pop eax                   ; return address
+    pop esp                   ; resture old stack pointer
+    jmp eax                   ; return