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- apply patch [ 658950 ] Bug in FPU

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Here are comments from the anonymous patch author :
  I found bug when using the FPU in 16 bit protected
  mode. When using the fsave command the 32bit
  structures were used instead of the 16bit ones.

  It now distinguishes between 16 and 32 bit protected mode
  which wasn't the case before.

  Now Ultima8 runs fine:)
This commit is contained in:
Christophe Bothamy 2003-01-03 00:20:05 +00:00
parent ae92b55818
commit b514c71079
1 changed files with 4 additions and 2 deletions
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6
bochs/fpu/wmFPUemu_glue.cc
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@ -86,6 +86,8 @@ BX_CPU_C::fpu_execute(bxInstruction_c *i)
fpu_cpu_ptr = this;
current_i387 = &(BX_CPU_THIS_PTR the_i387);
is_32 = BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b;
#if 0
addr_modes.default_mode = VM86;
addr_modes.default_mode = 0; // FPU_CS == __USER_CS && FPU_DS == __USER_DS
@ -93,7 +95,8 @@ BX_CPU_C::fpu_execute(bxInstruction_c *i)
addr_modes.default_mode = PM16;
#endif
if (protected_mode()) {
addr_modes.default_mode = SEG32;
if (is_32) addr_modes.default_mode = SEG32;
else addr_modes.default_mode = PM16;
}
else if (v8086_mode()) {
addr_modes.default_mode = VM86;
@ -107,7 +110,6 @@ BX_CPU_C::fpu_execute(bxInstruction_c *i)
// Mark if instruction used opsize or addrsize prefixes
// Actually, addr_modes.override.address_size is not used,
// could delete that code.
is_32 = BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b;
if (i->as32B() == is_32)
addr_modes.override.address_size = 0;
else