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krnl386.exe16: Emulate 'mov Eb, Gb' instruction on x86 processor architecture. 

Similar to the implementation in ntoskrnl.exe.

Signed-off-by: Michael Müller <michael@fds-team.de>
Signed-off-by: Sebastian Lackner <sebastian@fds-team.de>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
oldstable
Michael Müller 2016-04-05 16:27:55 +02:00 committed by Alexandre Julliard
parent df77e490d8
commit d8599db40a
1 changed files with 29 additions and 6 deletions
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35
dlls/krnl386.exe16/instr.c
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@ -113,7 +113,7 @@ static BOOL INSTR_ReplaceSelector( CONTEXT *context, WORD *sel )
/* store an operand into a register */
static void store_reg( CONTEXT *context, BYTE regmodrm, const BYTE *addr, int long_op )
static void store_reg_word( CONTEXT *context, BYTE regmodrm, const BYTE *addr, int long_op )
{
switch((regmodrm >> 3) & 7)
{
@ -152,6 +152,22 @@ static void store_reg( CONTEXT *context, BYTE regmodrm, const BYTE *addr, int lo
}
}
/* store an operand into a byte register */
static void store_reg_byte( CONTEXT *context, BYTE regmodrm, const BYTE *addr )
{
switch((regmodrm >> 3) & 7)
{
case 0: context->Eax = (context->Eax & 0xffffff00) | *addr; break;
case 1: context->Ecx = (context->Ecx & 0xffffff00) | *addr; break;
case 2: context->Edx = (context->Edx & 0xffffff00) | *addr; break;
case 3: context->Ebx = (context->Ebx & 0xffffff00) | *addr; break;
case 4: context->Eax = (context->Eax & 0xffff00ff) | (*addr << 8); break;
case 5: context->Ecx = (context->Ecx & 0xffff00ff) | (*addr << 8); break;
case 6: context->Edx = (context->Edx & 0xffff00ff) | (*addr << 8); break;
case 7: context->Ebx = (context->Ebx & 0xffff00ff) | (*addr << 8); break;
}
}
/***********************************************************************
* INSTR_GetOperandAddr
*
@ -333,7 +349,7 @@ static BOOL INSTR_EmulateLDS( CONTEXT *context, BYTE *instr, int long_op,
/* Now store the offset in the correct register */
store_reg( context, *regmodrm, addr, long_op );
store_reg_word( context, *regmodrm, addr, long_op );
/* Store the correct segment in the segment register */
@ -689,19 +705,26 @@ DWORD __wine_emulate_instruction( EXCEPTION_RECORD *rec, CONTEXT *context )
}
return ExceptionContinueExecution;
case 0x8a: /* mov Eb, Gb */
case 0x8b: /* mov Ev, Gv */
{
BYTE *addr = INSTR_GetOperandAddr(context, instr + 1, long_addr,
BYTE *data = INSTR_GetOperandAddr(context, instr + 1, long_addr,
segprefix, &len);
unsigned int data_size = (*instr == 0x8b) ? (long_op ? 4 : 2) : 1;
struct idtr idtr = get_idtr();
unsigned int offset = addr - idtr.base;
unsigned int offset = data - idtr.base;
if (offset <= idtr.limit + 1 - (long_op ? 4 : 2))
if (offset <= idtr.limit + 1 - data_size)
{
idt[1].LimitLow = 0x100; /* FIXME */
idt[2].LimitLow = 0x11E; /* FIXME */
idt[3].LimitLow = 0x500; /* FIXME */
store_reg( context, instr[1], (BYTE *)idt + offset, long_op );
switch (*instr)
{
case 0x8a: store_reg_byte( context, instr[1], (BYTE *)idt + offset ); break;
case 0x8b: store_reg_word( context, instr[1], (BYTE *)idt + offset, long_op ); break;
}
context->Eip += prefixlen + len + 1;
return ExceptionContinueExecution;
}