Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-04-20 20:36:35 +00:00
Code Issues Projects Releases Packages Wiki Activity

[FAST486]

Browse source 
- When accessing memory using ESP, make the SS segment default.
- The INT instructions always pushes 16-bit values in real mode, regardless
  of the operand/address size attributes.


svn path=/branches/ntvdm/; revision=61000
This commit is contained in:
Aleksandar Andrejevic 2013-11-15 20:49:48 +00:00
parent f5d0d3e784
commit 4b005f11bf
2 changed files with 19 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
lib/fast486/common.c
View file

@ -240,6 +240,14 @@ Fast486InterruptInternal(PFAST486_STATE State,
if (!Fast486StackPush(State, OldEsp)) return FALSE; if (!Fast486StackPush(State, OldEsp)) return FALSE;
} }
} }
else
{
if (State->SegmentRegs[FAST486_REG_CS].Size)
{
/* Set OPSIZE, because INT always pushes 16-bit values in real mode */
State->PrefixFlags |= FAST486_PREFIX_OPSIZE;
}
}
/* Push EFLAGS */ /* Push EFLAGS */
if (!Fast486StackPush(State, State->Flags.Long)) return FALSE; if (!Fast486StackPush(State, State->Flags.Long)) return FALSE;

11
lib/fast486/common.inl
View file

@ -730,6 +730,17 @@ Fast486ParseModRegRm(PFAST486_STATE State,
} }
} }
if ((SibByte & 0x07) == FAST486_REG_ESP)
{
/* Check if there is no segment override */
if (!(State->PrefixFlags & FAST486_PREFIX_SEG))
{
/* Add a SS: prefix */
State->PrefixFlags |= FAST486_PREFIX_SEG;
State->SegmentOverride = FAST486_REG_SS;
}
}
/* Calculate the address */ /* Calculate the address */
ModRegRm->MemoryAddress = Base + Index * Scale; ModRegRm->MemoryAddress = Base + Index * Scale;
} }