On 2/21/24 07:59, memristor2 via groups.io wrote:
> Hi,
> I am trying to build edk2-platforms for EagleStream Platform. The
> problem I am facing now is that the Peims are not getting dispatched
> when The PeiMain routine calls PeiDispatcher().
> After digging deeper into it it seems that the DepexSatisfied() routine
> is always returning false. So I also checked this and realized that the
> place that is returning false is inside the PeimDispatchReadiness
> function:
> ||```
> case (EFI_DEP_END): DEBUG ((DEBUG_DISPATCH, " END\n"));
> StackPtr--;
> //
> // Check to make sure EvalStack is balanced. If not, then there is
> // an error in the dependency grammar, so return
> EFI_INVALID_PARAMETER.
> //
> if (StackPtr != &EvalStack[0]) {
>
> DEBUG ((DEBUG_DISPATCH, " RESULT = FALSE (Underflow Error)\n"));
> return FALSE;
> }
>
> DEBUG ((DEBUG_DISPATCH, " RESULT = %a\n",
> IsPpiInstalled (PeiServices, StackPtr) ? "TRUE" : "FALSE"));
>
> return IsPpiInstalled (PeiServices, StackPtr);
> ```
> It seems that when entering IsPpiInstalled StackPtr in always NULL.
> Any thoughts on this?
StackPtr being NULL seems extremely unlikely; it is supposed to point to
elements of the EvalStack local array (or I guess one past the last
element).
Now, I can see two potential problems here:
- your depex is malformed (for whatever reason), and the eval stack is
not torn down entirely before reachig EFI_DEP_END. The code seems to
handle that correctly, by returning FALSE.
- your depex is malformed such that it immediately starts with an
EFI_DEP_END. The code is actually buggy for that case, because it
decrements StackPtr *first*, before comparing it against &EvalStack[0].
That decrement invokes undefined behavior. However, I assume in practice
the behavior will be the same as in the previous paragraph.
A NULL StackPtr value I cannot explain at all.
Laszlo
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