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Minor fixes to unwinding code.

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ccrause 2023-12-15 19:39:16 +02:00 committed by Martin
parent 4f7e9aee22
commit ceeaf52439
1 changed files with 11 additions and 4 deletions
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15
components/fpdebug/fpdbgdisasavr.pp
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@ -1484,6 +1484,10 @@ begin
FrameBasePointer := Thread.GetStackBasePointerRegisterValue;
ANewFrame := TDbgCallstackEntry.create(Thread, 0, FrameBasePointer, CodePointer);
// Frame pointer may not have been updated yet
if FrameBasePointer > StackPointer then
FrameBasePointer := StackPointer;
i := Thread.RegisterValueList.Count;
while i > 0 do begin
dec(i);
@ -1501,7 +1505,6 @@ const
DataOffset = $800000;
Size = 2;
var
NextIdx: LongInt;
LastFrameBase: TDBGPtr;
OutSideFrame: Boolean;
startPC, endPC: TDBGPtr;
@ -1549,6 +1552,9 @@ begin
if not Process.ReadData(DataOffset or (FrameBasePointer + returnAddrStackOffset), Size, CodePointer) or (CodePointer = 0) then exit;
{$PUSH}{$R-}{$Q-}
FrameBasePointer := StackPointer + returnAddrStackOffset + Size - 1; // After popping return-addr from stack
// An estimate of SP, needed when attempting unwinding of next frame
// If registers are spilled to stack this will be wrong.
StackPointer := FrameBasePointer;
{$POP}
end;
// Convert return address from BE to LE, shl 1 to get byte address
@ -1556,11 +1562,12 @@ begin
FLastFrameBaseIncreased := (FrameBasePointer <> 0) and (FrameBasePointer > LastFrameBase);
ANewFrame:= TDbgCallstackEntry.create(Thread, NextIdx, FrameBasePointer, CodePointer);
ANewFrame:= TDbgCallstackEntry.create(Thread, AFrameIndex, FrameBasePointer, CodePointer);
ANewFrame.RegisterValueList.DbgRegisterAutoCreate[nPC].SetValue(CodePointer, IntToStr(CodePointer),Size, PCindex);
ANewFrame.RegisterValueList.DbgRegisterAutoCreate[nSP].SetValue(StackPointer, IntToStr(StackPointer),Size, SPindex);
ANewFrame.RegisterValueList.DbgRegisterAutoCreate['r28'].SetValue(byte(FrameBasePointer), IntToStr(b),Size, 28);
ANewFrame.RegisterValueList.DbgRegisterAutoCreate['r29'].SetValue((FrameBasePointer and $FF00) shr 8, IntToStr(b),Size, 29);
ANewFrame.RegisterValueList.DbgRegisterAutoCreate['r28'].SetValue(byte(FrameBasePointer), IntToStr(byte(FrameBasePointer)),Size, 28);
b := byte(FrameBasePointer shr 8);
ANewFrame.RegisterValueList.DbgRegisterAutoCreate['r29'].SetValue(b, IntToStr(b), Size, 29);
FCodeReadErrCnt := 0;
Result := suSuccess;