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Improved linear address computation in bdshemu.

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This commit is contained in:
Andrei Vlad LUTAS 2020-07-24 23:11:36 +03:00
parent 6c248cc4c1
commit d11fe85599
2 changed files with 15 additions and 8 deletions
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21
bdshemu/bdshemu.c
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@ -788,12 +788,6 @@ ShemuComputeLinearAddress(
{ {
uint64_t gla = 0; uint64_t gla = 0;
// Memory operands usually have a segment.
if (Operand->Info.Memory.HasSeg)
{
gla += ShemuGetSegBase(Context, Operand->Info.Memory.Seg);
}
if (Operand->Info.Memory.HasBase) if (Operand->Info.Memory.HasBase)
{ {
gla += ShemuGetGprValue(Context, Operand->Info.Memory.Base, Operand->Info.Memory.BaseSize, false); gla += ShemuGetGprValue(Context, Operand->Info.Memory.Base, Operand->Info.Memory.BaseSize, false);
@ -857,11 +851,24 @@ ShemuComputeLinearAddress(
gla &= 0xFFFFFFFF; gla &= 0xFFFFFFFF;
break; break;
case ND_ADDR_16: case ND_ADDR_16:
gla &= 0xFFFFF; gla &= 0xFFFF;
default: default:
break; break;
} }
// Memory operands usually have a segment. Note that we don't care about any segment checks, since we're most
// likely be provided with flat segments. If checks should be needed, dedicated callbacks should be added.
if (Operand->Info.Memory.HasSeg)
{
gla += ShemuGetSegBase(Context, Operand->Info.Memory.Seg);
if (Context->Mode != ND_CODE_64)
{
// Truncate to 32 bit outside 64 bit.
gla &= 0xFFFFFFFF;
}
}
return gla; return gla;
} }

2
docs/source/index.rst
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@ -376,7 +376,7 @@ Determining if the instruction is a branch of any kind
if (ix.RipAccess & ND_ACCESS_ANY_WRITE) // Instruction writes RIP. if (ix.RipAccess & ND_ACCESS_ANY_WRITE) // Instruction writes RIP.
Computing the linear address of a memory operand Computing the virtual address of a memory operand
------------------------------------------------ ------------------------------------------------
.. code-block:: c .. code-block:: c