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VM8086 is always ON'

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This commit is contained in:
Stanislav Shwartsman 2007-12-21 21:14:48 +00:00
parent 48d56bf869
commit cc4a068d7b
1 changed files with 8 additions and 33 deletions
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41
bochs/cpu/vm8086.cc
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@ -1,5 +1,5 @@
/////////////////////////////////////////////////////////////////////////
// $Id: vm8086.cc,v 1.34 2007-12-20 20:58:38 sshwarts Exp $
// $Id: vm8086.cc,v 1.35 2007-12-21 21:14:48 sshwarts Exp $
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001 MandrakeSoft S.A.
@ -31,13 +31,7 @@
#include "cpu.h"
#define LOG_THIS BX_CPU_THIS_PTR
#if BX_SUPPORT_X86_64==0
// Make life easier for merging 64&32-bit code.
#define RIP EIP
#define RSP ESP
#endif
//
// Notes:
//
// The high bits of the 32bit eip image are ignored by
@ -49,9 +43,7 @@
// eIP out of code limits.
//
// IRET to VM does affect IOPL, IF, VM, and RF
#if BX_SUPPORT_V8086_MODE
//
#if BX_CPU_LEVEL >= 3
@ -111,7 +103,7 @@ void BX_CPU_C::stack_return_to_v86(Bit32u new_eip, Bit32u raw_cs_selector,
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.value = raw_fs_selector;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.value = raw_gs_selector;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value = raw_ss_selector;
RSP = new_esp; // full 32 bit are loaded
ESP = new_esp; // full 32 bit are loaded
init_v8086_mode();
}
@ -147,7 +139,7 @@ void BX_CPU_C::iret16_stack_return_from_v86(bxInstruction_c *i)
}
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
RIP = (Bit32u) ip;
EIP = (Bit32u) ip;
// IF, IOPL unchanged, EFLAGS.VIF = TMP_FLAGS.IF
Bit32u changeMask = EFlagsOSZAPCMask | EFlagsTFMask |
@ -161,7 +153,7 @@ void BX_CPU_C::iret16_stack_return_from_v86(bxInstruction_c *i)
#endif
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
RIP = (Bit32u) ip;
EIP = (Bit32u) ip;
write_flags(flags16, /*IOPL*/ 0, /*IF*/ 1);
}
@ -194,7 +186,7 @@ void BX_CPU_C::iret32_stack_return_from_v86(bxInstruction_c *i)
flags32 = pop_32();
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], (Bit16u) cs_raw);
RIP = eip;
EIP = eip;
// VIF, VIP, VM, IOPL unchanged
writeEFlags(flags32, change_mask);
}
@ -224,7 +216,7 @@ void BX_CPU_C::v86_redirect_interrupt(Bit32u vector)
push_16(old_IP);
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], (Bit16u) temp_CS);
RIP = temp_IP;
EIP = temp_IP;
BX_CPU_THIS_PTR clear_TF();
BX_CPU_THIS_PTR clear_RF();
@ -260,7 +252,6 @@ void BX_CPU_C::init_v8086_mode(void)
handleAlignmentCheck(); // CPL was modified
#endif
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.dpl = 3;
@ -333,19 +324,3 @@ void BX_CPU_C::init_v8086_mode(void)
}
#endif /* BX_CPU_LEVEL >= 3 */
#else // BX_SUPPORT_V8086_MODE
// compiled without v8086 mode support
void BX_CPU_C::stack_return_to_v86(Bit32u new_eip, Bit32u raw_cs_selector, Bit32u flags32)
{
BX_PANIC(("stack_return_to_v86: virtual 8086 mode not supported !"));
}
void BX_CPU_C::stack_return_from_v86(void)
{
BX_PANIC(("stack_return_from_v86: virtual 8086 mode not supported !"));
}
#endif // BX_SUPPORT_V8086_MODE