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Bochs/bochs/cpu/vm8086.cc

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- add RCS Id to header of every file. This makes it easier to know what's going on when someone sends in a modified file.
2001-10-03 17:10:38 +04:00
/////////////////////////////////////////////////////////////////////////
remove '^M' chars that somehow showed up I am reporting and disabling this PANIC. The report is this commit message, and the test case is win98.
2001-11-05 20:37:16 +03:00
// $Id: vm8086.cc,v 1.8 2001-11-05 17:37:16 fries Exp $
- add RCS Id to header of every file. This makes it easier to know what's going on when someone sends in a modified file.
2001-10-03 17:10:38 +04:00
/////////////////////////////////////////////////////////////////////////
//
- update copyright dates to 2001 for all mandrake headers - for bochs files with other header, replaced with current mandrake header
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// Copyright (C) 2001 MandrakeSoft S.A.
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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//
// MandrakeSoft S.A.
// 43, rue d'Aboukir
// 75002 Paris - France
// http://www.linux-mandrake.com/
// http://www.mandrakesoft.com/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- parts of the SMP merge apparantly broke the debugger and this revision tries to fix it. The shortcuts to register names such as AX and DL are #defines in cpu/cpu.h, and they are defined in terms of BX_CPU_THIS_PTR. When BX_USE_CPU_SMF=1, this works fine. (This is what bochs used for a long time, and nobody used the SMF=0 mode at all.) To make SMP bochs work, I had to get SMF=0 mode working for the CPU so that there could be an array of cpus. When SMF=0 for the CPU, BX_CPU_THIS_PTR is defined to be "this->" which only works within methods of BX_CPU_C. Code outside of BX_CPU_C must reference BX_CPU(num) instead. - to try to enforce the correct use of AL/AX/DL/etc. shortcuts, they are now only #defined when "NEED_CPU_REG_SHORTCUTS" is #defined. This is only done in the cpu/*.cc code.
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#define NEED_CPU_REG_SHORTCUTS 1
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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#include "bochs.h"
merge in BRANCH-io-cleanup. To see the commit logs for this use either cvsweb or cvs update -r BRANCH-io-cleanup and then 'cvs log' the various files. In general this provides a generic interface for logging. logfunctions:: is a class that is inherited by some classes, and also . allocated as a standalone global called 'genlog'. All logging uses . one of the ::info(), ::error(), ::ldebug(), ::panic() methods of this . class through 'BX_INFO(), BX_ERROR(), BX_DEBUG(), BX_PANIC()' macros . respectively. . . An example usage: . BX_INFO(("Hello, World!\n")); iofunctions:: is a class that is allocated once by default, and assigned as the iofunction of each logfunctions instance. It is this class that maintains the file descriptor and other output related code, at this point using vfprintf(). At some future point, someone may choose to write a gui 'console' for bochs to which messages would be redirected simply by assigning a different iofunction class to the various logfunctions objects. More cleanup is coming, but this works for now. If you want to see alot of debugging output, in main.cc, change onoff[LOGLEV_DEBUG]=0 to =1. Comments, bugs, flames, to me: todd@fries.net
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#define LOG_THIS BX_CPU_THIS_PTR
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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// Notes:
//
// The high bits of the 32bit eip image are ignored by
// the IRET to VM. The high bits of the 32bit esp image
// are loaded into ESP. A subsequent push uses
// only the low 16bits since it's in VM. In neither case
// did a protection fault occur during actual tests. This
// is contrary to the Intel docs which claim a #GP for
// 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
void
BX_CPU_C::stack_return_to_v86(Bit32u new_eip, Bit32u raw_cs_selector,
Bit32u flags32)
{
Bit32u temp_ESP, new_esp, esp_laddr;
Bit16u raw_es_selector, raw_ds_selector, raw_fs_selector,
raw_gs_selector, raw_ss_selector;
// Must be 32bit effective opsize, VM is in upper 16bits of eFLAGS
// CPL = 0 to get here
// ----------------
// | | OLD GS | eSP+32
// | | OLD FS | eSP+28
// | | OLD DS | eSP+24
// | | OLD ES | eSP+20
// | | OLD SS | eSP+16
// | OLD ESP | eSP+12
// | OLD EFLAGS | eSP+8
// | | OLD CS | eSP+4
// | OLD EIP | eSP+0
// ----------------
if (BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b)
temp_ESP = ESP;
else
temp_ESP = SP;
// top 36 bytes of stack must be within stack limits, else #GP(0)
if ( !can_pop(36) ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
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BX_PANIC(("iret: VM: top 36 bytes not within limits"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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exception(BX_SS_EXCEPTION, 0, 0);
return;
}
if ( new_eip & 0xffff0000 ) {
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
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BX_INFO(("IRET to V86-mode: ignoring upper 16-bits"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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new_eip = new_eip & 0xffff;
}
esp_laddr = BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base +
temp_ESP;
// load SS:ESP from stack
access_linear(esp_laddr + 12, 4, 0, BX_READ, &new_esp);
access_linear(esp_laddr + 16, 2, 0, BX_READ, &raw_ss_selector);
// load ES,DS,FS,GS from stack
access_linear(esp_laddr + 20, 2, 0, BX_READ, &raw_es_selector);
access_linear(esp_laddr + 24, 2, 0, BX_READ, &raw_ds_selector);
access_linear(esp_laddr + 28, 2, 0, BX_READ, &raw_fs_selector);
access_linear(esp_laddr + 32, 2, 0, BX_READ, &raw_gs_selector);
write_eflags(flags32, /*change IOPL*/ 1, /*change IF*/ 1,
/*change VM*/ 1, /*change RF*/ 1);
// load CS:EIP from stack; already read and passed as args
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value = raw_cs_selector;
EIP = new_eip;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.value = raw_es_selector;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.value = raw_ds_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;
ESP = new_esp; // Full 32bits are loaded.
init_v8086_mode();
}
void
BX_CPU_C::stack_return_from_v86(BxInstruction_t *i)
{
remove '^M' chars that somehow showed up I am reporting and disabling this PANIC. The report is this commit message, and the test case is win98.
2001-11-05 20:37:16 +03:00
BX_ERROR(("stack_return_from_v86 may not be implemented right!"));
- I was dismayed to find that stack_return_from_v86 was terribly incomplete. It did an exception, and then the real code seemed to be commented out with an #if 0...#endif. I put a panic there, asking people to please report how they arrived at that condition, and enabled the #if 0 code. This was pointed out by luca abeni <l_abeni@hotmail.com>.
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//exception(BX_GP_EXCEPTION, 0, 0);
remove '^M' chars that somehow showed up I am reporting and disabling this PANIC. The report is this commit message, and the test case is win98.
2001-11-05 20:37:16 +03:00
- I was dismayed to find that stack_return_from_v86 was terribly incomplete. It did an exception, and then the real code seemed to be commented out with an #if 0...#endif. I put a panic there, asking people to please report how they arrived at that condition, and enabled the #if 0 code. This was pointed out by luca abeni <l_abeni@hotmail.com>.
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#if 1
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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if (IOPL != 3) {
// trap to virtual 8086 monitor
remove '^M' chars that somehow showed up I am reporting and disabling this PANIC. The report is this commit message, and the test case is win98.
2001-11-05 20:37:16 +03:00
BX_ERROR(("stack_return_from_v86: IOPL != 3"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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exception(BX_GP_EXCEPTION, 0, 0);
}
if (i->os_32) {
Bit32u eip, ecs_raw, eflags;
// ??? should be some stack checks here
pop_32(&eip);
pop_32(&ecs_raw);
pop_32(&eflags);
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], (Bit16u) ecs_raw);
BX_CPU_THIS_PTR eip = eip;
write_eflags(eflags, /*IOPL*/ CPL==0, /*IF*/ 1, /*VM*/ 0, /*RF*/ 1);
}
else {
Bit16u ip, cs_raw, flags;
// ??? should be some stack checks here
pop_16(&ip);
pop_16(&cs_raw);
pop_16(&flags);
load_seg_reg(&BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS], cs_raw);
BX_CPU_THIS_PTR eip = (Bit32u) ip;
write_flags(flags, /*IOPL*/ CPL==0, /*IF*/ 1);
}
#endif
}
void
BX_CPU_C::init_v8086_mode(void)
{
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.segment = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.executable = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.c_ed = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.r_w = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.a = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.base =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.limit_scaled = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.g = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].cache.u.segment.avl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_CS].selector.rpl = 3;
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;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.segment = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.executable = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.c_ed = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.r_w = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.a = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.base =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.limit_scaled = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.g = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].cache.u.segment.avl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_SS].selector.rpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.segment = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.executable = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.c_ed = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.r_w = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.a = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.base =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.limit_scaled = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.g = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].cache.u.segment.avl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_ES].selector.rpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.segment = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.executable = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.c_ed = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.r_w = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.a = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.base =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.limit_scaled = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.g = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].cache.u.segment.avl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_DS].selector.rpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.segment = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.executable = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.c_ed = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.r_w = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.a = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.base =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.limit_scaled = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.g = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].cache.u.segment.avl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_FS].selector.rpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.valid = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.p = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.dpl = 3;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.segment = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.executable = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.c_ed = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.r_w = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.a = 1;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.base =
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.value << 4;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.limit = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.limit_scaled = 0xffff;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.g = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.d_b = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].cache.u.segment.avl = 0;
BX_CPU_THIS_PTR sregs[BX_SEG_REG_GS].selector.rpl = 3;
}
#endif /* BX_CPU_LEVEL >= 3 */
#else // BX_SUPPORT_V8086_MODE
// non-support of v8086 mode
void
BX_CPU_C::stack_return_to_v86(Bit32u new_eip, Bit32u raw_cs_selector, Bit32u flags32)
{
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
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BX_INFO(("stack_return_to_v86: VM bit set in EFLAGS stack image"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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v8086_message();
}
void
BX_CPU_C::stack_return_from_v86(void)
{
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
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BX_INFO(("stack_return_from_v86:"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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v8086_message();
}
void
BX_CPU_C::v8086_message(void)
{
strip '\n' from BX_{INFO,DEBUG,ERROR,PANIC} don't need it, moved the output of it into the general io functions. saves space, as well as removes the confusing output if a '\n' is left off
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BX_INFO(("Program compiled with BX_SUPPORT_V8086_MODE = 0"));
BX_INFO(("You need to rerun the configure script and recompile"));
BX_INFO((" to use virtual-8086 mode features."));
BX_PANIC(("Bummer!"));
- entered original Bochs snapshot bochs-2000_0325a.tar.gz from ftp.bochs.com
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}
#endif // BX_SUPPORT_V8086_MODE
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