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1 /*
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2 * This File contains all hardware dependent C code.
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3 */
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4
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5
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6 #include "VMS.h"
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7 #include "ProcrContext.h"
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8
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9 /*Create stack, then create __cdecl structure on it and put initialData and
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10 * pointer to the new structure instance into the parameter positions on
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11 * the stack
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12 *Then put function pointer into nextInstrPt -- the stack is setup in std
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13 * call structure, so jumping to function ptr is same as a GCC generated
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14 * function call
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15 *No need to save registers on old stack frame, because there's no old
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16 * animator state to return to --
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17 *
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18 */
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19 inline VirtProcr *
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20 create_procr_helper( VirtProcr *newPr, VirtProcrFnPtr fnPtr,
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21 void *initialData, void *stackLocs )
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22 {
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23 void *stackPtr;
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24
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25 newPr->startOfStack = stackLocs;
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26 newPr->procrID = _VMSMasterEnv->numProcrsCreated++;
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27 newPr->initialData = initialData;
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28 newPr->requests = NULL;
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29 newPr->schedSlot = NULL;
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30
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31 /*
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32 * Hardware dependent part
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33 */
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34 //instead of calling the function directly, call a wrapper function to fetch
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35 //arguments from stack
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36 newPr->nextInstrPt = (VirtProcrFnPtr)&startVirtProcrFn;
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37
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38 //fnPtr takes two params -- void *initData & void *animProcr
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39 //alloc stack locations, make stackPtr be the highest addr minus room
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40 // for 2 params + return addr. Return addr (NULL) is in loc pointed to
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41 // by stackPtr, initData at stackPtr + 8 bytes, animatingPr just above
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42 stackPtr = ( (void *)stackLocs + VIRT_PROCR_STACK_SIZE - 4*sizeof(void*));
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43
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44 //setup __cdecl on stack -- coreloop will switch to stackPtr before jmp
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45 *((VirtProcr**)stackPtr + 2 ) = newPr; //rightmost param
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46 *((void**)stackPtr + 1 ) = initialData; //next param to left
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47 *((void**)stackPtr) = (void*)fnPtr;
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48
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49 /*
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50 * end of Hardware dependent part
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51 */
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52
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53 newPr->stackPtr = stackPtr; //core loop will switch to this, then
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54 newPr->framePtr = stackPtr; //suspend loop will save new stack & frame ptr
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55
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56 //============================= MEASUREMENT STUFF ========================
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57 #ifdef STATS__TURN_ON_PROBES
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58 //struct timeval timeStamp;
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59 //gettimeofday( &(timeStamp), NULL);
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60 //newPr->createPtInSecs = timeStamp.tv_sec +(timeStamp.tv_usec/1000000.0) -
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61 // _VMSMasterEnv->createPtInSecs;
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62 #endif
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63 //========================================================================
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64
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65 return newPr;
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66 } |
