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ntoskrnl.exe: Add a helper function for accessing registers. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2018-03-01 17:11:12 +01:00
parent 81e698da27
commit 0cbb5d0a14
1 changed files with 20 additions and 16 deletions
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36
dlls/ntoskrnl.exe/instr.c
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@ -117,12 +117,29 @@ static void store_reg_byte( CONTEXT *context, BYTE regmodrm, const BYTE *addr )
}
}
static DWORD *get_reg_address( CONTEXT *context, BYTE rm )
{
switch (rm & 7)
{
case 0: return &context->Eax;
case 1: return &context->Ecx;
case 2: return &context->Edx;
case 3: return &context->Ebx;
case 4: return &context->Esp;
case 5: return &context->Ebp;
case 6: return &context->Esi;
case 7: return &context->Edi;
}
return NULL;
}
/***********************************************************************
* INSTR_GetOperandAddr
*
* Return the address of an instruction operand (from the mod/rm byte).
*/
static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
static void *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
int long_addr, int segprefix, int *len )
{
int mod, rm, base = 0, index = 0, ss = 0, off;
@ -135,20 +152,7 @@ static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
rm = mod & 7;
mod >>= 6;
if (mod == 3)
{
switch(rm)
{
case 0: return (BYTE *)&context->Eax;
case 1: return (BYTE *)&context->Ecx;
case 2: return (BYTE *)&context->Edx;
case 3: return (BYTE *)&context->Ebx;
case 4: return (BYTE *)&context->Esp;
case 5: return (BYTE *)&context->Ebp;
case 6: return (BYTE *)&context->Esi;
case 7: return (BYTE *)&context->Edi;
}
}
if (mod == 3) return get_reg_address( context, rm );
if (long_addr)
{
@ -254,7 +258,7 @@ static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
base &= 0xffff;
}
/* FIXME: we assume that all segments have a base of 0 */
return (BYTE *)(base + (index << ss));
return (void *)(base + (index << ss));
#undef GET_VAL
}