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Fixed save/restore of x87 regs

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This commit is contained in:
Stanislav Shwartsman 2010-07-01 20:00:33 +00:00
parent 4cf15cd18b
commit 41ddb26c6f
2 changed files with 12 additions and 6 deletions
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9
bochs/cpu/sse_move.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: sse_move.cc,v 1.117 2010-04-08 17:35:32 sshwarts Exp $
// $Id: sse_move.cc,v 1.118 2010-07-01 20:00:33 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003-2009 Stanislav Shwartsman
@ -238,7 +238,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FXSAVE(bxInstruction_c *i)
/* store i387 register file */
for(index=0; index < 8; index++)
{
const floatx80 &fp = BX_FPU_REG(index);
const floatx80 &fp = BX_READ_FPU_REG(index);
xmm.xmm64u(0) = fp.fraction;
xmm.xmm64u(1) = 0;
@ -344,7 +344,10 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FXRSTOR(bxInstruction_c *i)
floatx80 reg;
reg.fraction = read_virtual_qword(i->seg(), eaddr+index*16+32);
reg.exp = read_virtual_word (i->seg(), eaddr+index*16+40);
BX_FPU_REG(index) = reg;
// update tag only if it is not empty
BX_WRITE_FPU_REGISTER_AND_TAG(reg,
IS_TAG_EMPTY(index) ? FPU_Tag_Empty : FPU_tagof(reg), index);
}
BX_CPU_THIS_PTR the_i387.twd = unpack_FPU_TW(tag_byte);

9
bochs/cpu/xsave.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: xsave.cc,v 1.26 2010-03-14 15:51:27 sshwarts Exp $
// $Id: xsave.cc,v 1.27 2010-07-01 20:00:33 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2008-2009 Stanislav Shwartsman
@ -117,7 +117,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::XSAVE(bxInstruction_c *i)
/* store i387 register file */
for(index=0; index < 8; index++)
{
const floatx80 &fp = BX_FPU_REG(index);
const floatx80 &fp = BX_READ_FPU_REG(index);
xmm.xmm64u(0) = fp.fraction;
xmm.xmm64u(1) = 0;
@ -241,7 +241,10 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::XRSTOR(bxInstruction_c *i)
floatx80 reg;
reg.fraction = read_virtual_qword(i->seg(), eaddr+index*16+32);
reg.exp = read_virtual_word (i->seg(), eaddr+index*16+40);
BX_FPU_REG(index) = reg;
// update tag only if it is not empty
BX_WRITE_FPU_REGISTER_AND_TAG(reg,
IS_TAG_EMPTY(index) ? FPU_Tag_Empty : FPU_tagof(reg), index);
}
/* Restore floating point tag word - see desription for FXRSTOR instruction */