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[RTL/x64] Support frames to skip in flags to RtlWalkFrameChain

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svn path=/trunk/; revision=76019
This commit is contained in:
Timo Kreuzer 2017-10-01 14:34:26 +00:00
parent 37630ef0ab
commit 555300d680
1 changed files with 15 additions and 13 deletions
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28
reactos/sdk/lib/rtl/amd64/unwind.c
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@ -524,11 +524,14 @@ RtlWalkFrameChain(OUT PVOID *Callers,
ULONG64 ControlPc, ImageBase, EstablisherFrame;
ULONG64 StackLow, StackHigh;
PVOID HandlerData;
ULONG i;
ULONG i, FramesToSkip;
PRUNTIME_FUNCTION FunctionEntry;
DPRINT("Enter RtlWalkFrameChain\n");
/* The upper bits in Flags define how many frames to skip */
FramesToSkip = Flags >> 8;
/* Capture the current Context */
RtlCaptureContext(&Context);
ControlPc = Context.Rip;
@ -537,12 +540,12 @@ RtlWalkFrameChain(OUT PVOID *Callers,
RtlpGetStackLimits(&StackLow, &StackHigh);
/* Check if we want the user-mode stack frame */
if (Flags == 1)
if (Flags & 1)
{
}
/* Loop the frames */
for (i = 0; i < Count; i++)
for (i = 0; i < FramesToSkip + Count; i++)
{
/* Lookup the FunctionEntry for the current ControlPc */
FunctionEntry = RtlLookupFunctionEntry(ControlPc, &ImageBase, NULL);
@ -579,9 +582,14 @@ RtlWalkFrameChain(OUT PVOID *Callers,
break;
}
/* Save this frame and continue with new Rip */
/* Continue with new Rip */
ControlPc = Context.Rip;
Callers[i] = (PVOID)ControlPc;
/* Save value, if we are past the frames to skip */
if (i >= FramesToSkip)
{
Callers[i - FramesToSkip] = (PVOID)ControlPc;
}
}
DPRINT("RtlWalkFrameChain returns %ld\n", i);
@ -605,14 +613,8 @@ RtlGetCallersAddress(
* RtlWalkFrameChain -> RtlGetCallersAddress -> x -> y */
Number = RtlWalkFrameChain(Callers, 4, 0);
if (CallersAddress)
{
*CallersAddress = (Number >= 3) ? Callers[2] : NULL;
}
if (CallersCaller)
{
*CallersCaller = (Number == 4) ? Callers[3] : NULL;
}
*CallersAddress = (Number >= 3) ? Callers[2] : NULL;
*CallersCaller = (Number == 4) ? Callers[3] : NULL;
return;
}