613 lines
21 KiB
C++
613 lines
21 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: fpu.cc,v 1.48 2008-09-18 19:10:23 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2003 Stanislav Shwartsman
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// Written by Stanislav Shwartsman [sshwarts at sourceforge net]
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#include "cpu/cpu.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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#include "iodev/iodev.h"
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#define UPDATE_LAST_OPCODE 1
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#define CHECK_PENDING_EXCEPTIONS 1
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#if BX_SUPPORT_FPU
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void BX_CPU_C::prepareFPU(bxInstruction_c *i,
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bx_bool check_pending_exceptions, bx_bool update_last_instruction)
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{
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if (BX_CPU_THIS_PTR cr0.get_EM() || BX_CPU_THIS_PTR cr0.get_TS())
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exception(BX_NM_EXCEPTION, 0, 0);
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if (check_pending_exceptions)
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BX_CPU_THIS_PTR FPU_check_pending_exceptions();
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if (update_last_instruction)
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{
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BX_CPU_THIS_PTR the_i387.foo = (((Bit32u)(i->b1()) << 8) | i->modrm()) & 0x7ff;
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BX_CPU_THIS_PTR the_i387.fcs = BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value;
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BX_CPU_THIS_PTR the_i387.fip = BX_CPU_THIS_PTR prev_rip;
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if (! i->modC0()) {
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RMAddr(i) = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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BX_CPU_THIS_PTR the_i387.fds = BX_CPU_THIS_PTR sregs[i->seg()].selector.value;
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BX_CPU_THIS_PTR the_i387.fdp = RMAddr(i);
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}
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}
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}
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void BX_CPU_C::FPU_check_pending_exceptions(void)
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{
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if(BX_CPU_THIS_PTR the_i387.get_partial_status() & FPU_SW_Summary)
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{
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// NE=1 selects the native or internal mode, which generates #MF,
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// which is an extension introduced with 80486.
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// NE=0 selects the original (backward compatible) FPU error
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// handling, which generates an IRQ 13 via the PIC chip.
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#if BX_CPU_LEVEL >= 4
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if (BX_CPU_THIS_PTR cr0.get_NE() != 0) {
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exception(BX_MF_EXCEPTION, 0, 0);
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}
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else
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#endif
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{
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// MSDOS compatibility external interrupt (IRQ13)
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BX_INFO (("math_abort: MSDOS compatibility FPU exception"));
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DEV_pic_raise_irq(13);
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}
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}
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}
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bx_address BX_CPU_C::fpu_save_environment(bxInstruction_c *i)
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{
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unsigned offset;
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/* read all registers in stack order and update x87 tag word */
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for(int n=0;n<8;n++) {
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// update tag only if it is not empty
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if (! IS_TAG_EMPTY(n)) {
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int tag = FPU_tagof(BX_READ_FPU_REG(n));
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BX_CPU_THIS_PTR the_i387.FPU_settagi(tag, n);
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}
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}
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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if (protected_mode()) /* Protected Mode */
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{
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if (i->os32L() || i->os64L())
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{
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Bit32u tmp;
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tmp = 0xffff0000 | BX_CPU_THIS_PTR the_i387.get_control_word();
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write_virtual_dword(i->seg(), eaddr, tmp);
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tmp = 0xffff0000 | BX_CPU_THIS_PTR the_i387.get_status_word();
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write_virtual_dword(i->seg(), eaddr + 0x04, tmp);
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tmp = 0xffff0000 | BX_CPU_THIS_PTR the_i387.get_tag_word();
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write_virtual_dword(i->seg(), eaddr + 0x08, tmp);
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tmp = (Bit32u)(BX_CPU_THIS_PTR the_i387.fip);
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write_virtual_dword(i->seg(), eaddr + 0x0c, tmp);
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tmp = (BX_CPU_THIS_PTR the_i387.fcs & 0xffff) |
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((Bit32u)(BX_CPU_THIS_PTR the_i387.foo)) << 16;
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write_virtual_dword(i->seg(), eaddr + 0x10, tmp);
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tmp = (Bit32u)(BX_CPU_THIS_PTR the_i387.fdp);
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write_virtual_dword(i->seg(), eaddr + 0x14, tmp);
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tmp = 0xffff0000 | (BX_CPU_THIS_PTR the_i387.fds);
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write_virtual_dword(i->seg(), eaddr + 0x18, tmp);
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offset = 0x1c;
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}
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else /* Protected Mode - 16 bit */
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{
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Bit16u tmp;
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tmp = BX_CPU_THIS_PTR the_i387.get_control_word();
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write_virtual_word(i->seg(), eaddr, tmp);
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tmp = BX_CPU_THIS_PTR the_i387.get_status_word();
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write_virtual_word(i->seg(), eaddr + 0x02, tmp);
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tmp = BX_CPU_THIS_PTR the_i387.get_tag_word();
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write_virtual_word(i->seg(), eaddr + 0x04, tmp);
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tmp = (Bit16u)(BX_CPU_THIS_PTR the_i387.fip) & 0xffff;
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write_virtual_word(i->seg(), eaddr + 0x06, tmp);
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tmp = (BX_CPU_THIS_PTR the_i387.fcs);
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write_virtual_word(i->seg(), eaddr + 0x08, tmp);
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tmp = (Bit16u)(BX_CPU_THIS_PTR the_i387.fdp) & 0xffff;
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write_virtual_word(i->seg(), eaddr + 0x0a, tmp);
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tmp = (BX_CPU_THIS_PTR the_i387.fds);
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write_virtual_word(i->seg(), eaddr + 0x0c, tmp);
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offset = 0x0e;
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}
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}
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else /* Real or V86 Mode */
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{
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Bit32u fp_ip = ((Bit32u)(BX_CPU_THIS_PTR the_i387.fcs) << 4) +
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(Bit32u)(BX_CPU_THIS_PTR the_i387.fip);
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Bit32u fp_dp = ((Bit32u)(BX_CPU_THIS_PTR the_i387.fds) << 4) +
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(Bit32u)(BX_CPU_THIS_PTR the_i387.fdp);
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if (i->os32L())
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{
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Bit32u tmp;
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tmp = 0xffff0000 | BX_CPU_THIS_PTR the_i387.get_control_word();
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write_virtual_dword(i->seg(), eaddr, tmp);
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tmp = 0xffff0000 | BX_CPU_THIS_PTR the_i387.get_status_word();
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write_virtual_dword(i->seg(), eaddr + 0x04, tmp);
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tmp = 0xffff0000 | BX_CPU_THIS_PTR the_i387.get_tag_word();
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write_virtual_dword(i->seg(), eaddr + 0x08, tmp);
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tmp = 0xffff0000 | (fp_ip & 0xffff);
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write_virtual_dword(i->seg(), eaddr + 0x0c, tmp);
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tmp = ((fp_ip & 0xffff0000) >> 4) | BX_CPU_THIS_PTR the_i387.foo;
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write_virtual_dword(i->seg(), eaddr + 0x10, tmp);
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tmp = 0xffff0000 | (fp_dp & 0xffff);
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write_virtual_dword(i->seg(), eaddr + 0x14, tmp);
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tmp = (fp_dp & 0xffff0000) >> 4;
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write_virtual_dword(i->seg(), eaddr + 0x18, tmp);
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offset = 0x1c;
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}
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else /* Real or V86 Mode - 16 bit */
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{
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Bit16u tmp;
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tmp = BX_CPU_THIS_PTR the_i387.get_control_word();
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write_virtual_word(i->seg(), eaddr, tmp);
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tmp = BX_CPU_THIS_PTR the_i387.get_status_word();
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write_virtual_word(i->seg(), eaddr + 0x02, tmp);
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tmp = BX_CPU_THIS_PTR the_i387.get_tag_word();
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write_virtual_word(i->seg(), eaddr + 0x04, tmp);
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tmp = fp_ip & 0xffff;
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write_virtual_word(i->seg(), eaddr + 0x06, tmp);
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tmp = (Bit16u)((fp_ip & 0xf0000) >> 4) | BX_CPU_THIS_PTR the_i387.foo;
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write_virtual_word(i->seg(), eaddr + 0x08, tmp);
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tmp = fp_dp & 0xffff;
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write_virtual_word(i->seg(), eaddr + 0x0a, tmp);
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tmp = (Bit16u)((fp_dp & 0xf0000) >> 4);
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write_virtual_word(i->seg(), eaddr + 0x0c, tmp);
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offset = 0x0e;
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}
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}
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return (eaddr + offset);
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}
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bx_address BX_CPU_C::fpu_load_environment(bxInstruction_c *i)
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{
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unsigned offset;
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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if (protected_mode()) /* Protected Mode */
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{
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if (i->os32L() || i->os64L())
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{
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Bit32u tmp;
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tmp = read_virtual_dword(i->seg(), eaddr);
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BX_CPU_THIS_PTR the_i387.cwd = tmp & 0xffff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x04);
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BX_CPU_THIS_PTR the_i387.swd = tmp & 0xffff;
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BX_CPU_THIS_PTR the_i387.tos = (tmp >> 11) & 0x07;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x08);
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BX_CPU_THIS_PTR the_i387.twd = tmp & 0xffff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x0c);
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BX_CPU_THIS_PTR the_i387.fip = tmp;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x10);
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BX_CPU_THIS_PTR the_i387.fcs = tmp & 0xffff;
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BX_CPU_THIS_PTR the_i387.foo = (tmp >> 16) & 0x07ff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x14);
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BX_CPU_THIS_PTR the_i387.fdp = tmp;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x18);
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BX_CPU_THIS_PTR the_i387.fds = tmp & 0xffff;
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offset = 0x1c;
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}
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else /* Protected Mode - 16 bit */
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{
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Bit16u tmp;
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tmp = read_virtual_word(i->seg(), eaddr);
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BX_CPU_THIS_PTR the_i387.cwd = tmp;
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tmp = read_virtual_word(i->seg(), eaddr + 0x2);
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BX_CPU_THIS_PTR the_i387.swd = tmp;
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BX_CPU_THIS_PTR the_i387.tos = (tmp >> 11) & 0x07;
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tmp = read_virtual_word(i->seg(), eaddr + 0x04);
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BX_CPU_THIS_PTR the_i387.twd = tmp;
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tmp = read_virtual_word(i->seg(), eaddr + 0x06);
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BX_CPU_THIS_PTR the_i387.fip = tmp & 0xffff;
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tmp = read_virtual_word(i->seg(), eaddr + 0x08);
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BX_CPU_THIS_PTR the_i387.fcs = tmp;
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tmp = read_virtual_word(i->seg(), eaddr + 0x0a);
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BX_CPU_THIS_PTR the_i387.fdp = tmp & 0xffff;
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tmp = read_virtual_word(i->seg(), eaddr + 0x0c);
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BX_CPU_THIS_PTR the_i387.fds = tmp;
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/* opcode is defined to be zero */
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BX_CPU_THIS_PTR the_i387.foo = 0;
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offset = 0x0e;
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}
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}
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else /* Real or V86 Mode */
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{
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Bit32u fp_ip = 0, fp_dp = 0;
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if (i->os32L())
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{
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Bit32u tmp;
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tmp = read_virtual_dword(i->seg(), eaddr);
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BX_CPU_THIS_PTR the_i387.cwd = tmp & 0xffff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x04);
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BX_CPU_THIS_PTR the_i387.swd = tmp & 0xffff;
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BX_CPU_THIS_PTR the_i387.tos = (tmp >> 11) & 0x07;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x08);
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BX_CPU_THIS_PTR the_i387.twd = tmp & 0xffff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x0c);
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fp_ip = tmp & 0xffff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x10);
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fp_ip = fp_ip | ((tmp & 0x0ffff000) << 4);
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BX_CPU_THIS_PTR the_i387.fip = fp_ip;
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BX_CPU_THIS_PTR the_i387.foo = tmp & 0x07ff;
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BX_CPU_THIS_PTR the_i387.fcs = 0;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x14);
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fp_dp = tmp & 0xffff;
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tmp = read_virtual_dword(i->seg(), eaddr + 0x18);
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fp_dp = fp_dp | ((tmp & 0x0ffff000) << 4);
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BX_CPU_THIS_PTR the_i387.fdp = fp_dp;
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BX_CPU_THIS_PTR the_i387.fds = 0;
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offset = 0x1c;
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}
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else /* Real or V86 Mode - 16 bit */
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{
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Bit16u tmp;
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tmp = read_virtual_word(i->seg(), eaddr);
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BX_CPU_THIS_PTR the_i387.cwd = tmp;
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tmp = read_virtual_word(i->seg(), eaddr + 0x2);
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BX_CPU_THIS_PTR the_i387.swd = tmp;
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BX_CPU_THIS_PTR the_i387.tos = (tmp >> 11) & 0x07;
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tmp = read_virtual_word(i->seg(), eaddr + 0x04);
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BX_CPU_THIS_PTR the_i387.twd = tmp;
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tmp = read_virtual_word(i->seg(), eaddr + 0x06);
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fp_ip = tmp & 0xffff;
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tmp = read_virtual_word(i->seg(), eaddr + 0x08);
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fp_ip = fp_ip | ((tmp & 0xf000) << 4);
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BX_CPU_THIS_PTR the_i387.fip = fp_ip;
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BX_CPU_THIS_PTR the_i387.foo = tmp & 0x07ff;
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BX_CPU_THIS_PTR the_i387.fcs = 0;
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tmp = read_virtual_word(i->seg(), eaddr + 0x0a);
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fp_dp = tmp & 0xffff;
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tmp = read_virtual_word(i->seg(), eaddr + 0x0c);
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fp_dp = fp_dp | ((tmp & 0xf000) << 4);
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BX_CPU_THIS_PTR the_i387.fdp = fp_dp;
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BX_CPU_THIS_PTR the_i387.fds = 0;
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offset = 0x0e;
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}
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}
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/* always set bit 6 as '1 */
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BX_CPU_THIS_PTR the_i387.cwd =
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(BX_CPU_THIS_PTR the_i387.cwd & ~FPU_CW_Reserved_Bits) | 0x0040;
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/* check for unmasked exceptions */
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if (FPU_PARTIAL_STATUS & ~FPU_CONTROL_WORD & FPU_CW_Exceptions_Mask)
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{
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/* set the B and ES bits in the status-word */
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FPU_PARTIAL_STATUS |= FPU_SW_Summary | FPU_SW_Backward;
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}
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else
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{
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/* clear the B and ES bits in the status-word */
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FPU_PARTIAL_STATUS &= ~(FPU_SW_Summary | FPU_SW_Backward);
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}
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return (eaddr + offset);
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}
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/* D9 /5 */
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void BX_CPP_AttrRegparmN(1) BX_CPU_C::FLDCW(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i, CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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Bit16u cwd = read_virtual_word(i->seg(), eaddr);
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FPU_CONTROL_WORD = (cwd & ~FPU_CW_Reserved_Bits) | 0x0040; // bit 6 is reserved as '1
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/* check for unmasked exceptions */
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if (FPU_PARTIAL_STATUS & ~FPU_CONTROL_WORD & FPU_CW_Exceptions_Mask)
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{
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/* set the B and ES bits in the status-word */
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FPU_PARTIAL_STATUS |= FPU_SW_Summary | FPU_SW_Backward;
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}
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else
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{
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/* clear the B and ES bits in the status-word */
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FPU_PARTIAL_STATUS &= ~(FPU_SW_Summary | FPU_SW_Backward);
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}
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#else
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BX_INFO(("FLDCW: required FPU, configure --enable-fpu"));
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#endif
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}
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/* D9 /7 */
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void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNSTCW(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
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Bit16u cwd = BX_CPU_THIS_PTR the_i387.get_control_word();
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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write_virtual_word(i->seg(), eaddr, cwd);
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#else
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BX_INFO(("FNSTCW: required FPU, configure --enable-fpu"));
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#endif
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}
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/* DD /7 */
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void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNSTSW(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
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Bit16u swd = BX_CPU_THIS_PTR the_i387.get_status_word();
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bx_address eaddr = BX_CPU_CALL_METHODR(i->ResolveModrm, (i));
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write_virtual_word(i->seg(), eaddr, swd);
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#else
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BX_INFO(("FNSTSW: required FPU, configure --enable-fpu"));
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#endif
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}
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/* DF E0 */
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void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNSTSW_AX(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
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AX = BX_CPU_THIS_PTR the_i387.get_status_word();
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#else
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BX_INFO(("FNSTSW_AX: required FPU, configure --enable-fpu"));
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#endif
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}
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/* DD /4 */
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void BX_CPP_AttrRegparmN(1) BX_CPU_C::FRSTOR(bxInstruction_c *i)
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{
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#if BX_SUPPORT_FPU
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BX_CPU_THIS_PTR prepareFPU(i, CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
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bx_address offset = fpu_load_environment(i);
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floatx80 tmp;
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/* read all registers in stack order */
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for(int n=0;n<8;n++)
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|
{
|
|
tmp.fraction = read_virtual_qword(i->seg(), offset + n*10);
|
|
tmp.exp = read_virtual_word (i->seg(), offset + n*10 + 8);
|
|
|
|
// update tag only if it is not empty
|
|
BX_WRITE_FPU_REGISTER_AND_TAG(tmp,
|
|
IS_TAG_EMPTY(n) ? FPU_Tag_Empty : FPU_tagof(tmp), n);
|
|
}
|
|
#else
|
|
BX_INFO(("FRSTOR: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
/* DD /6 */
|
|
void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNSAVE(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
|
|
|
|
bx_address offset = fpu_save_environment(i);
|
|
|
|
/* save all registers in stack order. */
|
|
for(int n=0;n<8;n++)
|
|
{
|
|
floatx80 stn = BX_READ_FPU_REG(n);
|
|
write_virtual_qword(i->seg(), offset + n*10, stn.fraction);
|
|
write_virtual_word (i->seg(), offset + n*10 + 8, stn.exp);
|
|
}
|
|
|
|
BX_CPU_THIS_PTR the_i387.init();
|
|
#else
|
|
BX_INFO(("FNSAVE: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
/* 9B E2 */
|
|
void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNCLEX(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
|
|
|
|
FPU_PARTIAL_STATUS &= ~(FPU_SW_Backward|FPU_SW_Summary|FPU_SW_Stack_Fault|FPU_SW_Precision|
|
|
FPU_SW_Underflow|FPU_SW_Overflow|FPU_SW_Zero_Div|FPU_SW_Denormal_Op|
|
|
FPU_SW_Invalid);
|
|
|
|
// do not update last fpu instruction pointer
|
|
#else
|
|
BX_INFO(("FNCLEX: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
/* DB E3 */
|
|
void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNINIT(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
|
|
BX_CPU_THIS_PTR the_i387.init();
|
|
#else
|
|
BX_INFO(("FNINIT: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
/* D9 /4 */
|
|
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 and update x87 tag word */
|
|
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
|
|
}
|
|
|
|
/* D9 /6 */
|
|
void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNSTENV(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
|
|
fpu_save_environment(i);
|
|
/* mask all floating point exceptions */
|
|
FPU_CONTROL_WORD |= FPU_CW_Exceptions_Mask;
|
|
/* clear the B and ES bits in the status word */
|
|
FPU_PARTIAL_STATUS &= ~(FPU_SW_Backward|FPU_SW_Summary);
|
|
#else
|
|
BX_INFO(("FNSTENV: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
/* D9 D0 */
|
|
void BX_CPP_AttrRegparmN(1) BX_CPU_C::FNOP(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i, CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
|
|
|
|
// Perform no FPU operation. This instruction takes up space in the
|
|
// instruction stream but does not affect the FPU or machine
|
|
// context, except the EIP register.
|
|
#else
|
|
BX_INFO(("FNOP: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
void BX_CPP_AttrRegparmN(1) BX_CPU_C::FPLEGACY(bxInstruction_c *i)
|
|
{
|
|
#if BX_SUPPORT_FPU
|
|
BX_CPU_THIS_PTR prepareFPU(i, !CHECK_PENDING_EXCEPTIONS, !UPDATE_LAST_OPCODE);
|
|
|
|
// FPU performs no specific operation and no internal x87 states
|
|
// are affected
|
|
#else
|
|
BX_INFO(("legacy FPU opcodes: required FPU, configure --enable-fpu"));
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|
|
#if BX_SUPPORT_FPU
|
|
|
|
#include <math.h>
|
|
|
|
void BX_CPU_C::print_state_FPU(void)
|
|
{
|
|
static double scale_factor = pow(2.0, -63.0);
|
|
static char* cw_round_control[] = {
|
|
"NEAREST", "DOWN", "UP", "CHOP"
|
|
};
|
|
static char* cw_precision_control[] = {
|
|
"32", "RES", "64", "80"
|
|
};
|
|
|
|
Bit32u reg;
|
|
reg = BX_CPU_THIS_PTR the_i387.get_status_word();
|
|
fprintf(stderr, "status word: 0x%04x: ", reg);
|
|
fprintf(stderr, "%s %s TOS%d %s %s %s %s %s %s %s %s %s %s %s\n",
|
|
(reg & FPU_SW_Backward) ? "B" : "b",
|
|
(reg & FPU_SW_C3) ? "C3" : "c3", (FPU_TOS&7),
|
|
(reg & FPU_SW_C2) ? "C2" : "c2",
|
|
(reg & FPU_SW_C1) ? "C1" : "c1",
|
|
(reg & FPU_SW_C0) ? "C0" : "c0",
|
|
(reg & FPU_SW_Summary) ? "ES" : "es",
|
|
(reg & FPU_SW_Stack_Fault) ? "SF" : "sf",
|
|
(reg & FPU_SW_Precision) ? "PE" : "pe",
|
|
(reg & FPU_SW_Underflow) ? "UE" : "ue",
|
|
(reg & FPU_SW_Overflow) ? "OE" : "oe",
|
|
(reg & FPU_SW_Zero_Div) ? "ZE" : "ze",
|
|
(reg & FPU_SW_Denormal_Op) ? "DE" : "de",
|
|
(reg & FPU_SW_Invalid) ? "IE" : "ie");
|
|
|
|
reg = BX_CPU_THIS_PTR the_i387.get_control_word();
|
|
fprintf(stderr, "control word: 0x%04x: ", reg);
|
|
fprintf(stderr, "%s RC_%s PC_%s %s %s %s %s %s %s\n",
|
|
(reg & FPU_CW_Inf) ? "INF" : "inf",
|
|
(cw_round_control[(reg & FPU_CW_RC) >> 10]),
|
|
(cw_precision_control[(reg & FPU_CW_PC) >> 8]),
|
|
(reg & FPU_CW_Precision) ? "PM" : "pm",
|
|
(reg & FPU_CW_Underflow) ? "UM" : "um",
|
|
(reg & FPU_CW_Overflow) ? "OM" : "om",
|
|
(reg & FPU_CW_Zero_Div) ? "ZM" : "zm",
|
|
(reg & FPU_CW_Denormal) ? "DM" : "dm",
|
|
(reg & FPU_CW_Invalid) ? "IM" : "im");
|
|
|
|
reg = BX_CPU_THIS_PTR the_i387.get_tag_word();
|
|
fprintf(stderr, "tag word: 0x%04x\n", reg);
|
|
reg = BX_CPU_THIS_PTR the_i387.foo;
|
|
fprintf(stderr, "operand: 0x%04x\n", reg);
|
|
reg = (Bit32u)(BX_CPU_THIS_PTR the_i387.fip) & 0xffffffff;
|
|
fprintf(stderr, "fip: 0x%08x\n", reg);
|
|
reg = BX_CPU_THIS_PTR the_i387.fcs;
|
|
fprintf(stderr, "fcs: 0x%04x\n", reg);
|
|
reg = (Bit32u)(BX_CPU_THIS_PTR the_i387.fdp) & 0xffffffff;
|
|
fprintf(stderr, "fdp: 0x%08x\n", reg);
|
|
reg = BX_CPU_THIS_PTR the_i387.fds;
|
|
fprintf(stderr, "fds: 0x%04x\n", reg);
|
|
|
|
// print stack too
|
|
int tos = FPU_TOS & 7;
|
|
for (int i=0; i<8; i++) {
|
|
const floatx80 &fp = BX_FPU_REG(i);
|
|
unsigned tag = BX_CPU_THIS_PTR the_i387.FPU_gettagi((i-tos)&7);
|
|
if (tag != FPU_Tag_Empty) tag = FPU_tagof(fp);
|
|
double f = pow(2.0, ((0x7fff & fp.exp) - 0x3fff));
|
|
if (fp.exp & 0x8000) f = -f;
|
|
#ifdef _MSC_VER
|
|
f *= (double)(signed __int64)(fp.fraction>>1) * scale_factor * 2;
|
|
#else
|
|
f *= fp.fraction*scale_factor;
|
|
#endif
|
|
fprintf(stderr, "%sFP%d ST%d(%c): raw 0x%04x:%08lx%08lx (%.10f)\n",
|
|
i==tos?"=>":" ", i, (i-tos)&7,
|
|
"v0se"[tag],
|
|
fp.exp & 0xffff, GET32H(fp.fraction), GET32L(fp.fraction),
|
|
f);
|
|
}
|
|
}
|
|
#endif
|