1 /*

2 * This File contains all hardware dependent C code.

3 */

4

5

6 #include "VMS.h"

7 #include "ProcrContext.h"

8

9 /*Create stack, then create __cdecl structure on it and put initialData and

10 * pointer to the new structure instance into the parameter positions on

11 * the stack

12 *Then put function pointer into nextInstrPt -- the stack is setup in std

13 * call structure, so jumping to function ptr is same as a GCC generated

14 * function call

15 *No need to save registers on old stack frame, because there's no old

16 * animator state to return to --

17 *

18 */

19 inline VirtProcr *

20 create_procr_helper( VirtProcr *newPr, VirtProcrFnPtr fnPtr,

21 void *initialData, void *stackLocs )

22 {

23 void *stackPtr;

24

25 newPr->startOfStack = stackLocs;

26 newPr->procrID = _VMSMasterEnv->numProcrsCreated++;

27 newPr->initialData = initialData;

28 newPr->requests = NULL;

29 newPr->schedSlot = NULL;

30

31 /*

32 * Hardware dependent part

33 */

34 //instead of calling the function directly, call a wrapper function to fetch

35 //arguments from stack

36 newPr->nextInstrPt = (VirtProcrFnPtr)&startVirtProcrFn;

37

38 //fnPtr takes two params -- void *initData & void *animProcr

39 //alloc stack locations, make stackPtr be the highest addr minus room

40 // for 2 params + return addr. Return addr (NULL) is in loc pointed to

41 // by stackPtr, initData at stackPtr + 8 bytes, animatingPr just above

42 stackPtr = ( (void *)stackLocs + VIRT_PROCR_STACK_SIZE - 4*sizeof(void*));

43

44 //setup __cdecl on stack -- coreloop will switch to stackPtr before jmp

45 *((VirtProcr**)stackPtr + 2 ) = newPr; //rightmost param

46 *((void**)stackPtr + 1 ) = initialData; //next param to left

47 *((void**)stackPtr) = (void*)fnPtr;

48

49 /*

50 * end of Hardware dependent part

51 */

52

53 newPr->stackPtr = stackPtr; //core loop will switch to this, then

54 newPr->framePtr = stackPtr; //suspend loop will save new stack & frame ptr

55

56 //============================= MEASUREMENT STUFF ========================

57 #ifdef STATS__TURN_ON_PROBES

58 //struct timeval timeStamp;

59 //gettimeofday( &(timeStamp), NULL);

60 //newPr->createPtInSecs = timeStamp.tv_sec +(timeStamp.tv_usec/1000000.0) -

61 // _VMSMasterEnv->createPtInSecs;

62 #endif

63 //========================================================================

64

65 return newPr;

66 }