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changeset 17:030fceb7e9b9

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Kinda have test working -- assembly looks right for saving core loop frame and stack and restoring them But have a bug that looks timing-related, so thinking maybe some threads are going to completion? The whole test isn't quite right yet -- it throws exception because the suspended virtual processors never have a continuation put back into the workQ (is this right? Is that why it throws exception?) Want to move to full code to finish debugging
author Me
date Tue, 22 Jun 2010 12:37:32 -0700
parents c3e6c3fda84e
children 734c665500e4
files CoreLoop.c
diffstat 1 files changed, 16 insertions(+), 9 deletions(-) [+]
line diff
     1.1 --- a/CoreLoop.c	Tue Jun 22 11:53:32 2010 -0700
     1.2 +++ b/CoreLoop.c	Tue Jun 22 12:37:32 2010 -0700
     1.3 @@ -69,11 +69,14 @@
     1.4     currPr->coreAnimatedBy  = coreLoopThdParams->coreNum;
     1.5  
     1.6        //switch to virt procr's stack and frame ptr then jump to virt procr
     1.7 -   void *stackPtr, *framePtr, *jmpPt, *jmpPt_saveForLater;
     1.8 +   void *stackPtr, *framePtr, *jmpPt, *coreLoopFramePtrAddr, \
     1.9 +        *coreLoopStackPtrAddr;
    1.10     
    1.11     stackPtr = currPr->stackPtr;
    1.12     framePtr = currPr->framePtr;
    1.13     jmpPt    = currPr->nextInstrPt;
    1.14 +   coreLoopFramePtrAddr = &(currPr->coreLoopFramePtr);
    1.15 +   coreLoopStackPtrAddr = &(currPr->coreLoopStackPtr);
    1.16  
    1.17        //Save the core loop's stack and frame pointers into virt procr struct
    1.18        // then switch to stack ptr and frame ptr of virt procr & jmp to it
    1.19 @@ -82,14 +85,18 @@
    1.20        // frame pointer, then tried to jump to an addr stored on stack, which
    1.21        // it accessed as an offset from frame-ptr!  (wrong frame-ptr now)
    1.22        //Explicitly loading into eax before changing frame-ptr fixed it
    1.23 -   asm volatile("movl %%ebp, %0; \
    1.24 -                 movl %%esp, %1; \
    1.25 -                 movl %2, %%eax; \
    1.26 -                 movl %3, %%esp; \
    1.27 -                 movl %4, %%ebp; \
    1.28 -                 jmp  %%eax"                                   \
    1.29 -   /* outputs */ : "=g"(currPr->coreLoopFramePtr),             \
    1.30 -                   "=g"(currPr->coreLoopStackPtr)              \
    1.31 +      //Also, it turns "(currPr->coreLoopFramePtr)" into a temporary on the
    1.32 +      // stack, so "movl %%ebp, %0" saves to the temp, NOT the data-struc!
    1.33 +   asm volatile("movl %0, %%eax;      \
    1.34 +                 movl %%esp, (%%eax); \
    1.35 +                 movl %1, %%eax;      \
    1.36 +                 movl %%ebp, (%%eax); \
    1.37 +                 movl %2, %%eax;      \
    1.38 +                 movl %3, %%esp;      \
    1.39 +                 movl %4, %%ebp;      \
    1.40 +                 jmp  %%eax"          \
    1.41 +   /* outputs */ : "=g"(coreLoopStackPtrAddr),                 \
    1.42 +                   "=g"(coreLoopFramePtrAddr)                  \
    1.43     /* inputs  */ : "g" (jmpPt), "g" (stackPtr), "g" (framePtr) \
    1.44     /* clobber */ : "memory", "%eax", "%ebx", "%ecx", "%edx", "%edi", "%esi" \
    1.45                  );