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i- Partially fixed x87 Underflow/Overflow (#P) unmasked responce

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This commit is contained in:
Stanislav Shwartsman 2008-09-02 19:46:30 +00:00
parent bdf25fa3ca
commit dbb6c1c5ae
2 changed files with 20 additions and 13 deletions
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13
bochs/fpu/ferr.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: ferr.cc,v 1.12 2008-09-02 05:36:15 sshwarts Exp $
// $Id: ferr.cc,v 1.13 2008-09-02 19:46:30 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003 Stanislav Shwartsman
@ -54,7 +54,7 @@ void BX_CPU_C::FPU_stack_underflow(int stnr, int pop_stack)
}
/* Returns unmasked exceptions if occured */
unsigned BX_CPU_C::FPU_exception(int exception)
unsigned BX_CPU_C::FPU_exception(unsigned exception, bx_bool is_mem)
{
/* Extract only the bits which we use to set the status word */
exception &= (FPU_SW_Exceptions_Mask);
@ -77,10 +77,17 @@ unsigned BX_CPU_C::FPU_exception(int exception)
}
}
// if #P unmasked exception occured the result still has to be
// If #P unmasked exception occured the result still has to be
// written to the destination.
unmasked &= ~FPU_CW_Precision;
// If unmasked overflow or underflow occurs and destination is a memory
// location, the TOS and destination operands remain unchanged and no
// result is stored in the memory. If the destination is in the register
// stack, adjusted resulting value is stored in the destination operand.
if (! is_mem)
unmasked &= ~(FPU_CW_Underflow | FPU_CW_Overflow);
return unmasked;
}

20
bochs/fpu/fpu_load_store.cc
View File

@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: fpu_load_store.cc,v 1.27 2008-07-13 15:35:10 sshwarts Exp $
// $Id: fpu_load_store.cc,v 1.28 2008-09-02 19:46:30 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003 Stanislav Shwartsman
@ -308,7 +308,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FST_SINGLE_REAL(bxInstruction_c *i)
save_reg = floatx80_to_float32(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -346,7 +346,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FST_DOUBLE_REAL(bxInstruction_c *i)
save_reg = floatx80_to_float64(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -415,7 +415,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FIST_WORD_INTEGER(bxInstruction_c *i)
save_reg = floatx80_to_int16(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -453,7 +453,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FIST_DWORD_INTEGER(bxInstruction_c *i)
save_reg = floatx80_to_int32(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -489,7 +489,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FISTP_QWORD_INTEGER(bxInstruction_c *i)
save_reg = floatx80_to_int64(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -557,7 +557,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FBSTP_PACKED_BCD(bxInstruction_c *i)
}
/* check for fpu arithmetic exceptions */
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -595,7 +595,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FISTTP16(bxInstruction_c *i)
save_reg = floatx80_to_int16_round_to_zero(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -631,7 +631,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FISTTP32(bxInstruction_c *i)
save_reg = floatx80_to_int32_round_to_zero(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}
@ -667,7 +667,7 @@ void BX_CPP_AttrRegparmN(1) BX_CPU_C::FISTTP64(bxInstruction_c *i)
save_reg = floatx80_to_int64_round_to_zero(BX_READ_FPU_REG(0), status);
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags))
if (BX_CPU_THIS_PTR FPU_exception(status.float_exception_flags, 1))
return;
}