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Fixed FPU tags after FLDENV instruction

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This commit is contained in:
Stanislav Shwartsman 2008-04-26 20:24:20 +00:00
parent f17928ead0
commit 4ecadb915b
1 changed files with 16 additions and 3 deletions
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19
bochs/fpu/fpu.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: fpu.cc,v 1.36 2008-04-26 12:14:58 sshwarts Exp $
// $Id: fpu.cc,v 1.37 2008-04-26 20:24:20 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003 Stanislav Shwartsman
@ -32,7 +32,6 @@
#define UPDATE_LAST_OPCODE 1
#define CHECK_PENDING_EXCEPTIONS 1
#if BX_SUPPORT_FPU
void BX_CPU_C::prepareFPU(bxInstruction_c *i,
bx_bool check_pending_exceptions, bx_bool update_last_instruction)
@ -297,6 +296,9 @@ int BX_CPU_C::fpu_load_environment(bxInstruction_c *i)
}
}
/* always set bit 6 - reserved */
BX_CPU_THIS_PTR the_i387.cwd |= 0x0040;
/* check for unmasked exceptions */
if (FPU_PARTIAL_STATUS & ~FPU_CONTROL_WORD & FPU_CW_Exceptions_Mask)
{
@ -321,7 +323,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDCW(bxInstruction_c *i)
BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
Bit16u cwd = read_virtual_word(i->seg(), RMAddr(i));
FPU_CONTROL_WORD = cwd;
FPU_CONTROL_WORD = cwd | 0x0040; // bit 6 is reserved - always set
/* check for unmasked exceptions */
if (FPU_PARTIAL_STATUS & ~FPU_CONTROL_WORD & FPU_CW_Exceptions_Mask)
@ -461,6 +463,17 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDENV(bxInstruction_c *i)
#if BX_SUPPORT_FPU
BX_CPU_THIS_PTR prepareFPU(i, CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
fpu_load_environment(i);
/* read all registers in stack order */
for(int n=0;n<8;n++)
{
// update tag only if it is not empty
if (! IS_TAG_EMPTY(n))
{
int tag = FPU_tagof(BX_READ_FPU_REG(n));
BX_CPU_THIS_PTR the_i387.FPU_settagi(tag, n);
}
}
#else
BX_INFO(("FLDENV: required FPU, configure --enable-fpu"));
#endif