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[RTL/x64] Fix logic in RtlpTryToUnwindEpilog

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svn path=/trunk/; revision=76020
This commit is contained in:
Timo Kreuzer 2017-10-01 14:36:21 +00:00
parent 555300d680
commit 87fcad8440
1 changed files with 20 additions and 12 deletions
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32
reactos/sdk/lib/rtl/amd64/unwind.c
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@ -295,9 +295,9 @@ RtlpTryToUnwindEpilog(
}
}
/* Loop the following instructions */
EndAddress = FunctionEntry->EndAddress + ImageBase;
while((DWORD64)InstrPtr < EndAddress)
/* Loop the following instructions before the ret */
EndAddress = FunctionEntry->EndAddress + ImageBase - 1;
while ((DWORD64)InstrPtr < EndAddress)
{
Instr = *(DWORD*)InstrPtr;
@ -315,23 +315,31 @@ RtlpTryToUnwindEpilog(
if ( (Instr & 0xf8fb) == 0x5841 )
{
/* Opcode is pop r8 .. r15 */
Reg = (Instr & 0x7) + 8;
Reg = ((Instr >> 8) & 0x7) + 8;
PopReg(&LocalContext, Reg);
InstrPtr += 2;
continue;
}
/* Check for retn / retf */
if ( (Instr & 0xf7) == 0xc3 )
{
/* We are finished */
break;
}
/* Opcode not allowed for Epilog */
return FALSE;
}
/* Check if we are at the ret instruction */
if ((DWORD64)InstrPtr != EndAddress)
{
/* If we went past the end of the function, something is broken! */
ASSERT((DWORD64)InstrPtr <= EndAddress);
return FALSE;
}
/* Make sure this is really a ret instruction */
if (*InstrPtr != 0xc3)
{
ASSERT(FALSE);
return FALSE;
}
/* Unwind is finished, pop new Rip from Stack */
LocalContext.Rip = *(DWORD64*)LocalContext.Rsp;
LocalContext.Rsp += sizeof(DWORD64);
@ -414,7 +422,7 @@ RtlVirtualUnwind(
}
}
/* Process the left Ops */
/* Process the remaining unwind ops */
while (i < UnwindInfo->CountOfCodes)
{
UnwindCode = UnwindInfo->UnwindCode[i];