587 lines
13 KiB
C++
587 lines
13 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: ctrl_xfer16.cc,v 1.50 2007-12-30 20:16:34 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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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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#define NEED_CPU_REG_SHORTCUTS 1
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#include "bochs.h"
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#include "cpu.h"
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#define LOG_THIS BX_CPU_THIS_PTR
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// Make code more tidy with a few macros.
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#if BX_SUPPORT_X86_64==0
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#define RSP ESP
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#endif
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void BX_CPU_C::RETnear16_Iw(bxInstruction_c *i)
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{
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_ret;
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#endif
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BX_CPU_THIS_PTR speculative_rsp = 1;
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BX_CPU_THIS_PTR prev_rsp = RSP;
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Bit16u return_IP = pop_16();
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if (return_IP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled)
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{
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BX_ERROR(("retnear_iw: IP > limit"));
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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EIP = return_IP;
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Bit16u imm16 = i->Iw();
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b) /* 32bit stack */
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ESP += imm16;
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else
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SP += imm16;
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BX_CPU_THIS_PTR speculative_rsp = 0;
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BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_RET, EIP);
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}
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void BX_CPU_C::RETnear16(bxInstruction_c *i)
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{
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_ret;
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#endif
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BX_CPU_THIS_PTR speculative_rsp = 1;
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BX_CPU_THIS_PTR prev_rsp = RSP;
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Bit16u return_IP = pop_16();
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if (return_IP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled)
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{
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BX_ERROR(("retnear: IP > limit"));
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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EIP = return_IP;
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BX_CPU_THIS_PTR speculative_rsp = 0;
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BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_RET, EIP);
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}
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void BX_CPU_C::RETfar16_Iw(bxInstruction_c *i)
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{
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Bit16s imm16;
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Bit16u ip, cs_raw;
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invalidate_prefetch_q();
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_ret;
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#endif
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imm16 = i->Iw();
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BX_CPU_THIS_PTR speculative_rsp = 1;
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BX_CPU_THIS_PTR prev_rsp = RSP;
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if (protected_mode()) {
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BX_CPU_THIS_PTR return_protected(i, imm16);
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goto done;
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}
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ip = pop_16();
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cs_raw = pop_16();
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load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
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EIP = (Bit32u) ip;
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if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
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ESP += imm16;
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else
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SP += imm16;
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done:
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BX_CPU_THIS_PTR speculative_rsp = 0;
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BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_RET,
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, EIP);
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}
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void BX_CPU_C::RETfar16(bxInstruction_c *i)
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{
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Bit16u ip, cs_raw;
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invalidate_prefetch_q();
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_ret;
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#endif
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BX_CPU_THIS_PTR speculative_rsp = 1;
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BX_CPU_THIS_PTR prev_rsp = RSP;
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if (protected_mode()) {
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BX_CPU_THIS_PTR return_protected(i, 0);
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goto done;
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}
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ip = pop_16();
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cs_raw = pop_16();
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load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
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EIP = (Bit32u) ip;
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done:
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BX_CPU_THIS_PTR speculative_rsp = 0;
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BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_RET,
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, EIP);
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}
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void BX_CPU_C::CALL_Jw(bxInstruction_c *i)
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{
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Bit32u new_EIP;
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_call;
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#endif
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new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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if (new_EIP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled)
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{
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BX_ERROR(("CALL_Jw: new_IP > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].limit"));
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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/* push 16 bit EA of next instruction */
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push_16(IP);
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EIP = new_EIP;
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BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_CALL, EIP);
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}
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void BX_CPU_C::CALL16_Ap(bxInstruction_c *i)
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{
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Bit16u cs_raw;
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Bit16u disp16;
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invalidate_prefetch_q();
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_call;
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#endif
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disp16 = i->Iw();
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cs_raw = i->Iw2();
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BX_CPU_THIS_PTR speculative_rsp = 1;
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BX_CPU_THIS_PTR prev_rsp = RSP;
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if (protected_mode()) {
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BX_CPU_THIS_PTR call_protected(i, cs_raw, disp16);
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goto done;
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}
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push_16(BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value);
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push_16((Bit16u) EIP);
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load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
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EIP = (Bit32u) disp16;
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done:
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BX_CPU_THIS_PTR speculative_rsp = 0;
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BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_CALL,
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, EIP);
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}
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void BX_CPU_C::CALL_Ew(bxInstruction_c *i)
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{
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Bit16u op1_16;
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_call;
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#endif
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if (i->modC0()) {
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op1_16 = BX_READ_16BIT_REG(i->rm());
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}
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else {
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op1_16 = read_virtual_word(i->seg(), RMAddr(i));
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}
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if (op1_16 > BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled)
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{
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BX_ERROR(("CALL_Ew: IP out of CS limits!"));
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exception(BX_GP_EXCEPTION, 0, 0);
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}
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push_16(IP);
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EIP = op1_16;
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BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_CALL, EIP);
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}
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void BX_CPU_C::CALL16_Ep(bxInstruction_c *i)
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{
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Bit16u cs_raw;
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Bit16u op1_16;
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invalidate_prefetch_q();
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#if BX_DEBUGGER
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BX_CPU_THIS_PTR show_flag |= Flag_call;
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#endif
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op1_16 = read_virtual_word(i->seg(), RMAddr(i));
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cs_raw = read_virtual_word(i->seg(), RMAddr(i)+2);
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BX_CPU_THIS_PTR speculative_rsp = 1;
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BX_CPU_THIS_PTR prev_rsp = RSP;
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if (protected_mode()) {
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BX_CPU_THIS_PTR call_protected(i, cs_raw, op1_16);
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goto done;
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}
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push_16(BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value);
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push_16(IP);
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load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
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EIP = op1_16;
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done:
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BX_CPU_THIS_PTR speculative_rsp = 0;
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BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_CALL,
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BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, EIP);
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}
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void BX_CPU_C::JMP_Jw(bxInstruction_c *i)
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{
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_JMP, new_EIP);
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}
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void BX_CPU_C::JO_Jw(bxInstruction_c *i)
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{
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if (get_OF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNO_Jw(bxInstruction_c *i)
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{
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if (! get_OF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JB_Jw(bxInstruction_c *i)
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{
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if (get_CF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNB_Jw(bxInstruction_c *i)
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{
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if (! get_CF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JZ_Jw(bxInstruction_c *i)
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{
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if (get_ZF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNZ_Jw(bxInstruction_c *i)
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{
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if (! get_ZF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JBE_Jw(bxInstruction_c *i)
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{
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if (get_CF() || get_ZF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNBE_Jw(bxInstruction_c *i)
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{
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if (! (get_CF() || get_ZF())) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JS_Jw(bxInstruction_c *i)
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{
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if (get_SF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNS_Jw(bxInstruction_c *i)
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{
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if (! get_SF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JP_Jw(bxInstruction_c *i)
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{
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if (get_PF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNP_Jw(bxInstruction_c *i)
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{
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if (! get_PF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JL_Jw(bxInstruction_c *i)
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{
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if (getB_SF() != getB_OF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JNL_Jw(bxInstruction_c *i)
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{
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if (getB_SF() == getB_OF()) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
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return;
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}
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BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
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}
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void BX_CPU_C::JLE_Jw(bxInstruction_c *i)
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{
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if (get_ZF() || (getB_SF() != getB_OF())) {
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Bit32u new_EIP = EIP + (Bit32s) i->Id();
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new_EIP &= 0x0000ffff;
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branch_near32(new_EIP);
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BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
|
|
return;
|
|
}
|
|
|
|
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
|
|
}
|
|
|
|
void BX_CPU_C::JNLE_Jw(bxInstruction_c *i)
|
|
{
|
|
if (! get_ZF() && (getB_SF() == getB_OF())) {
|
|
Bit32u new_EIP = EIP + (Bit32s) i->Id();
|
|
new_EIP &= 0x0000ffff;
|
|
branch_near32(new_EIP);
|
|
BX_INSTR_CNEAR_BRANCH_TAKEN(BX_CPU_ID, new_EIP);
|
|
return;
|
|
}
|
|
|
|
BX_INSTR_CNEAR_BRANCH_NOT_TAKEN(BX_CPU_ID);
|
|
}
|
|
|
|
void BX_CPU_C::JMP_EwM(bxInstruction_c *i)
|
|
{
|
|
Bit16u new_IP = read_virtual_word(i->seg(), RMAddr(i));
|
|
|
|
branch_near32((Bit32u) new_IP);
|
|
|
|
BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_JMP, new_IP);
|
|
}
|
|
|
|
void BX_CPU_C::JMP_EwR(bxInstruction_c *i)
|
|
{
|
|
Bit32u new_EIP = BX_READ_16BIT_REG(i->rm());
|
|
branch_near32(new_EIP);
|
|
BX_INSTR_UCNEAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_JMP, new_EIP);
|
|
}
|
|
|
|
/* Far indirect jump */
|
|
void BX_CPU_C::JMP16_Ep(bxInstruction_c *i)
|
|
{
|
|
Bit16u cs_raw;
|
|
Bit16u op1_16;
|
|
|
|
invalidate_prefetch_q();
|
|
|
|
op1_16 = read_virtual_word(i->seg(), RMAddr(i));
|
|
cs_raw = read_virtual_word(i->seg(), RMAddr(i)+2);
|
|
|
|
// jump_protected doesn't affect RSP so it is RSP safe
|
|
if (protected_mode()) {
|
|
BX_CPU_THIS_PTR jump_protected(i, cs_raw, op1_16);
|
|
goto done;
|
|
}
|
|
|
|
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
|
|
EIP = op1_16;
|
|
|
|
done:
|
|
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_JMP,
|
|
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, EIP);
|
|
}
|
|
|
|
void BX_CPU_C::IRET16(bxInstruction_c *i)
|
|
{
|
|
Bit16u ip, cs_raw, flags;
|
|
|
|
invalidate_prefetch_q();
|
|
|
|
#if BX_DEBUGGER
|
|
BX_CPU_THIS_PTR show_flag |= Flag_iret;
|
|
#endif
|
|
|
|
BX_CPU_THIS_PTR nmi_disable = 0;
|
|
|
|
BX_CPU_THIS_PTR speculative_rsp = 1;
|
|
BX_CPU_THIS_PTR prev_rsp = RSP;
|
|
|
|
if (v8086_mode()) {
|
|
// IOPL check in stack_return_from_v86()
|
|
iret16_stack_return_from_v86(i);
|
|
goto done;
|
|
}
|
|
|
|
if (protected_mode()) {
|
|
iret_protected(i);
|
|
goto done;
|
|
}
|
|
|
|
ip = pop_16();
|
|
cs_raw = pop_16();
|
|
flags = pop_16();
|
|
|
|
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
|
|
EIP = (Bit32u) ip;
|
|
write_flags(flags, /* change IOPL? */ 1, /* change IF? */ 1);
|
|
|
|
done:
|
|
BX_CPU_THIS_PTR speculative_rsp = 0;
|
|
|
|
BX_INSTR_FAR_BRANCH(BX_CPU_ID, BX_INSTR_IS_IRET,
|
|
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value, EIP);
|
|
}
|