Commit Graph

85 Commits

Author SHA1 Message Date
Stanislav Shwartsman
f9bd2b74be 1. Fixed bug in FSUB instruction
2. Fixed bug

[ 989478 ] I-Cache and undefined Instruktions

The L4 microkernel uses an undefined instruction to
trap for a special requests into the kernel (LOCK NOP).
The handler fixes this up and gives the user a special
code page with syscall stubs. If you're not using the
I-Cache optimization everthing works find on bochs. But
if you enable the I-Cache (--enable-icache), then the
undefined opcode exception is thrown only once for ever
virtual address it occurs. See the demodisk of the
L4KA::pistachio
(http://www.l4ka.org/projects/pistachio/download.php).
In this case the pingpong benchmark of this demo is of
interest. Everything runs fine until the program tries
to spawn a new task for its measurements. This new task
shares the code of the creating program. But the new
task stops executing at the undefined instruction
explained above and no exception is thrown.
2004-07-29 20:15:19 +00:00
Stanislav Shwartsman
5873b26a82 Speed up compilation process.
bochs.h already not include iodev.h which reduces compilation dependences for almost all cpu and fpu files, now cpu files will not be recompiled if iodev includes was changed
2004-06-19 15:20:15 +00:00
Michael Brown
d1922bc835 Changed #ifdef MAGIC_BREAKPOINT to #if BX_MAGIC_BREAKPOINT and added a
configure script option --enable-magic-breakpoints (enabled by default).

Documented the instruction required to trigger the magic breakpoint
(xchgw %bx,%bx).
2004-01-29 17:49:03 +00:00
Daniel Gimpelevich
ae66bb33c0 Applied Russ Cox's CPU panic debug patch from Oct 2003. 2004-01-17 08:36:29 +00:00
Stanislav Shwartsman
d5210af668 Two new bx_instrumentation callbacks 2003-10-09 19:05:13 +00:00
Alexander Krisak
45df735c30 Apply Vitaly's Vorobyov debugger patch 2003-08-04 16:03:09 +00:00
Volker Ruppert
d1652093ac - applied some parts of the patch from Andrew Zabolotny <zap@cobra.ru>
* changed all %ll format descriptions to FMT_LL macro so that
    Microsoft Visual C works correctly (it uses %I64)
  * missing type conversions added
  * cdrom.cc: variable types for win32 fixed
  * removed some unused variables in eth_win32.cc and harddrv.cc
  * added missing includes in make_cmos_image.c and niclist.c
2003-06-07 19:16:55 +00:00
Stanislav Shwartsman
777e0db06b Fixed cpu.cc compilation error with ICache disabled
Added --enable-3dnow configuration option
2003-05-21 15:48:55 +00:00
Kevin Lawton
a17d06abcb Optimized the main cpu loop iCache checks to remove a redundant
check.

Commented out a number of instances of invalidate_prefetch_q(),
for branches which do not change CS since the EIP window mechanism
takes care of validating that EIP lands in the current page or not
in the main cpu loop anyways.

Fixed a couple cases (v8086 mode and real mode) of loading CS where
the EIP page window was not invalidated in segment_ctrl_pro.cc.
That may fix some aliasing problems reported before (OS2).
2003-05-10 22:25:55 +00:00
Christophe Bothamy
1a518b81fe - add __attribute__((regparm(X))) performance trick with gcc on x86
on some cpu instructions (patch from Conn Clark)
- performance improvement is 1% on win95 boot
2003-03-17 00:41:01 +00:00
Peter Tattam
94880d1412 Fix guest2host and related optimizations to work on 64 bit host.
1) fixed the type of "hostPageAddr" and associated typecasts.
2) fixed the type of "pages" and associated typecasts (overloaded variable)
3) patch to cpu.cc to calculate "eipPageBias" correctly in 64 bit mode
2003-02-28 02:37:18 +00:00
Stanislav Shwartsman
cdfc3cbce4 instrumentation enchancements:
* renamed CPU_ID to BX_CPU_ID.
  with this new name there is no possibility for name contentions and BX_CPU_ID
  definition could be moved out to NEED_CPU_REG_SHORTCUTS block

* returned back `unsigned BX_CPU::which_cpu(void)` function

* added BX_CPU_ID parameter for
	BX_INSTR_PHY_READ(a20addr, len);
	BX_INSTR_PHY_WRITE(a20addr, len);
    now it will be
	BX_INSTR_PHY_READ(cpu_id, a20addr, len);
	BX_INSTR_PHY_WRITE(cpu_id, a20addr, len);
2003-02-13 15:04:11 +00:00
Stanislav Shwartsman
9c5c40e8ce Fixed BX_INSTR_OPCODE call when instruction was found in the ICache 2002-12-26 20:22:35 +00:00
Stanislav Shwartsman
f2f976d736 Add BX_INSTR_FETCH_DECODE_COMPLETED call even if an instruction hitten in ICache 2002-12-20 13:36:50 +00:00
Christophe Bothamy
3104ba6bea - fix [ 625878 ] reset doesn't reset something(?)
In bx_cpu_c::reset method I set bx_cpu->async_event to 2
  so execution in the cpu_loop gets stopped early.

  Previously, async_event was set to 0, and with repeatable
  instructions, after reset, eip was incremented by the instruction
  length, so execution would resume at 0xffffX (X being >0, the current
  instruction length).

  In halt state I check now for reset with async_event is 2, so
  reset works also when the cpu is halted. (update to Peter change)

  I hope I fixed this the right way, please report any strange behaviour.
2002-11-21 08:08:29 +00:00
Peter Tattam
1bb5040031 Miscellaneous patches for Tattam's External Debugger.
- Now compiles for plain ia-32
- Fixed some printf formatting for ia32 only.
- Update to latest Win32 DLL
- Added an ICEBP (Undoc 0xF8, INT 01) facility.
- updated to use latest VGA refresh routine
2002-11-04 05:27:26 +00:00
Bryce Denney
48acd53db4 - all #warnings are now inside #ifdef __GNUC__ ... #endif
Modified Files:
    ltdl.c main.cc plugin.cc cpu/cpu.cc cpu/debugstuff.cc
    cpu/exception.cc cpu/fetchdecode64.cc cpu/init.cc
    cpu/paging.cc gui/siminterface.cc gui/wxmain.cc
    iodev/harddrv.cc
2002-10-25 12:36:44 +00:00
Bryce Denney
cec9135e9f - Apply patch.replace-Boolean rev 1.3. Every "Boolean" is now changed to a
"bx_bool" which is always defined as Bit32u on all platforms.  In Carbon
  specific code, Boolean is still used because the Carbon header files
  define it to unsigned char.
- this fixes bug [ 623152 ] MacOSX: Triple Exception Booting win95.
  The bug was that some code in Bochs depends on Boolean to be a
  32 bit value.  (This should be fixed, but I don't know all the places
  where it needs to be fixed yet.)  Because Carbon defined Boolean as
  an unsigned char, Bochs just followed along and used the unsigned char
  definition to avoid compile problems.  This exposed the dependency
  on 32 bit Boolean on MacOS X only and led to major simulation problems,
  that could only be reproduced and debugged on that platform.
- On the mailing list we debated whether to make all Booleans into "bool" or
  our own type.  I chose bx_bool for several reasons.
  1. Unlike C++'s bool, we can guarantee that bx_bool is the same size on all
     platforms, which makes it much less likely to have more platform-specific
     simulation differences in the future.  (I spent hours on a borrowed
     MacOSX machine chasing bug 618388 before discovering that different sized
     Booleans were the problem, and I don't want to repeat that.)
  2. We still have at least one dependency on 32 bit Booleans which must be
     fixed some time, but I don't want to risk introducing new bugs into the
     simulation just before the 2.0 release.

Modified Files:
    bochs.h config.h.in gdbstub.cc logio.cc main.cc pc_system.cc
    pc_system.h plugin.cc plugin.h bios/rombios.c cpu/apic.cc
    cpu/arith16.cc cpu/arith32.cc cpu/arith64.cc cpu/arith8.cc
    cpu/cpu.cc cpu/cpu.h cpu/ctrl_xfer16.cc cpu/ctrl_xfer32.cc
    cpu/ctrl_xfer64.cc cpu/data_xfer16.cc cpu/data_xfer32.cc
    cpu/data_xfer64.cc cpu/debugstuff.cc cpu/exception.cc
    cpu/fetchdecode.cc cpu/flag_ctrl_pro.cc cpu/init.cc
    cpu/io_pro.cc cpu/lazy_flags.cc cpu/lazy_flags.h cpu/mult16.cc
    cpu/mult32.cc cpu/mult64.cc cpu/mult8.cc cpu/paging.cc
    cpu/proc_ctrl.cc cpu/segment_ctrl_pro.cc cpu/stack_pro.cc
    cpu/tasking.cc debug/dbg_main.cc debug/debug.h debug/sim2.cc
    disasm/dis_decode.cc disasm/disasm.h doc/docbook/Makefile
    docs-html/cosimulation.html fpu/wmFPUemu_glue.cc
    gui/amigaos.cc gui/beos.cc gui/carbon.cc gui/gui.cc gui/gui.h
    gui/keymap.cc gui/keymap.h gui/macintosh.cc gui/nogui.cc
    gui/rfb.cc gui/sdl.cc gui/siminterface.cc gui/siminterface.h
    gui/term.cc gui/win32.cc gui/wx.cc gui/wxmain.cc gui/wxmain.h
    gui/x.cc instrument/example0/instrument.cc
    instrument/example0/instrument.h
    instrument/example1/instrument.cc
    instrument/example1/instrument.h
    instrument/stubs/instrument.cc instrument/stubs/instrument.h
    iodev/cdrom.cc iodev/cdrom.h iodev/cdrom_osx.cc iodev/cmos.cc
    iodev/devices.cc iodev/dma.cc iodev/dma.h iodev/eth_arpback.cc
    iodev/eth_packetmaker.cc iodev/eth_packetmaker.h
    iodev/floppy.cc iodev/floppy.h iodev/guest2host.h
    iodev/harddrv.cc iodev/harddrv.h iodev/ioapic.cc
    iodev/ioapic.h iodev/iodebug.cc iodev/iodev.h
    iodev/keyboard.cc iodev/keyboard.h iodev/ne2k.h
    iodev/parallel.h iodev/pci.cc iodev/pci.h iodev/pic.h
    iodev/pit.cc iodev/pit.h iodev/pit_wrap.cc iodev/pit_wrap.h
    iodev/sb16.cc iodev/sb16.h iodev/serial.cc iodev/serial.h
    iodev/vga.cc iodev/vga.h memory/memory.h memory/misc_mem.cc
2002-10-25 11:44:41 +00:00
Bryce Denney
5e520261db Add plugin support to Bochs by merging all the changes from the
BRANCH_PLUGINS branch!

Authors:
  Bryce Denney
  Christophe Bothamy
  Kevin Lawton (we grabbed a lot of plugin code from plex86)
Testing help from:
  Volker Ruppert
  Don Becker (Psyon)
  Jeremy Parsons (Br'fin)

The change log is too long to paste in here.  To read the change log, do
  cvs log patches/patch.final-from-BRANCH_PLUGINS.gz

All the changes and a detailed description are contained in a patch
called patch.final-from-BRANCH_PLUGINS.gz.  To look at the complete
patch, do
  cvs upd -r1.1 patches/patch.final-from-BRANCH_PLUGINS.gz

Then you will have a local copy of the patch, which you can gunzip and
play with however you want.

Modified Files:
    .bochsrc Makefile.in aclocal.m4 bochs.h config.h.in configure
    configure.in gdbstub.cc logio.cc main.cc pc_system.cc
    pc_system.h state_file.h bios/Makefile.in bios/rombios.c
    cpu/Makefile.in cpu/access.cc cpu/apic.cc cpu/arith16.cc
    cpu/arith32.cc cpu/arith8.cc cpu/cpu.cc cpu/cpu.h
    cpu/ctrl_xfer32.cc cpu/exception.cc cpu/fetchdecode.cc
    cpu/fetchdecode64.cc cpu/flag_ctrl.cc cpu/flag_ctrl_pro.cc
    cpu/init.cc cpu/io.cc cpu/logical16.cc cpu/logical32.cc
    cpu/logical8.cc cpu/paging.cc cpu/proc_ctrl.cc
    cpu/protect_ctrl.cc cpu/segment_ctrl_pro.cc cpu/shift16.cc
    cpu/shift32.cc cpu/stack64.cc cpu/string.cc cpu/tasking.cc
    debug/Makefile.in debug/dbg_main.cc disasm/Makefile.in
    doc/docbook/user/user.dbk dynamic/Makefile.in fpu/Makefile.in
    gui/Makefile.in gui/amigaos.cc gui/beos.cc gui/carbon.cc
    gui/control.cc gui/control.h gui/gui.cc gui/gui.h
    gui/keymap.cc gui/keymap.h gui/macintosh.cc gui/nogui.cc
    gui/rfb.cc gui/sdl.cc gui/sdlkeys.h gui/siminterface.cc
    gui/siminterface.h gui/term.cc gui/win32.cc gui/wx.cc
    gui/wxdialog.cc gui/wxdialog.h gui/wxmain.cc gui/wxmain.h
    gui/x.cc gui/keymaps/sdl-pc-de.map gui/keymaps/sdl-pc-us.map
    gui/keymaps/x11-pc-de.map instrument/example0/instrument.h
    instrument/example1/instrument.h
    instrument/stubs/instrument.cc instrument/stubs/instrument.h
    iodev/Makefile.in iodev/biosdev.cc iodev/biosdev.h
    iodev/cdrom.cc iodev/cmos.cc iodev/cmos.h iodev/devices.cc
    iodev/dma.cc iodev/dma.h iodev/eth_fbsd.cc iodev/eth_linux.cc
    iodev/eth_null.cc iodev/eth_tap.cc iodev/floppy.cc
    iodev/floppy.h iodev/guest2host.cc iodev/guest2host.h
    iodev/harddrv.cc iodev/harddrv.h iodev/iodebug.cc
    iodev/iodebug.h iodev/iodev.h iodev/keyboard.cc
    iodev/keyboard.h iodev/ne2k.cc iodev/ne2k.h iodev/parallel.cc
    iodev/parallel.h iodev/pci.cc iodev/pci.h iodev/pci2isa.cc
    iodev/pci2isa.h iodev/pic.cc iodev/pic.h iodev/pit.cc
    iodev/pit.h iodev/pit_wrap.cc iodev/pit_wrap.h iodev/sb16.cc
    iodev/sb16.h iodev/scancodes.cc iodev/scancodes.h
    iodev/serial.cc iodev/serial.h iodev/slowdown_timer.cc
    iodev/slowdown_timer.h iodev/unmapped.cc iodev/unmapped.h
    iodev/vga.cc iodev/vga.h memory/Makefile.in memory/memory.cc
    memory/memory.h memory/misc_mem.cc misc/bximage.c
    misc/niclist.c
Added Files:
    README-plugins extplugin.h ltdl.c ltdl.h ltdlconf.h.in
    ltmain.sh plugin.cc plugin.h
2002-10-24 21:07:56 +00:00
Stanislav Shwartsman
c5f0ef8c76 Removed duplicated definition of BX_SEG_REGS 2002-10-16 22:10:07 +00:00
Kevin Lawton
b8d7f5c88e Moved the asm() statements from the arithmetic instruction emulation
into inline functions with asm() statements in cpu.h.  This cleans
  up the *.cc code (which now doesn't have any asm()s in it), and
  centralizes the asm() code so constraints can be modified in one
  place.  This also makes it easier to cover more instructions
  with asm()s for more efficient eflags handling.
2002-10-07 22:51:58 +00:00
Kevin Lawton
d7a16521c4 Replaced "return;" statements associated with bx_guard.special_unwind_stack
hack with longjmp() back to cpu.cc main decode loop, and added a
  check in there to return control when bx_guard.special_unwind_stack
  is set (compiling with debugger enabled only).

If in the debugger you try to execute further instructions
  (which you shouldn't), other fields need to be reset I would
  think, such as EXT and errorno, and have to make sure ESP/EIP
  are corrected properly.  Basically, this hack is only good
  for examining the current situation of a nasty fault.
2002-10-06 22:08:18 +00:00
Kevin Lawton
b1d2f7ae48 Added a return value to handleAsyncEvent() so that requests to
exit out of cpu_loop() and back to the caller can be honored.
  Previously, code in this function was a part of cpu_loop so
  a "return;" would already do that.  Now, a value is passed
  back to cpu_loop() to denote such a request, and then a return
  is executed from cpu_loop().

  I haven't tested this yet, but previously I must have broke
  certain debugging requests by moving the code to a separate
  function and not fixing the "return;" statements.
2002-10-05 14:51:25 +00:00
Peter Tattam
db0a37824c Fixed elusive APIC interrupt problems when bochs compiled for P6 or later.
Symptom:  Linux kernel 2.4.19 would hang in random places.  CPU still
running, but in dle loop.

Cause: if APIC interrupt occurred while a PIC interrupt was pending, the
PIC interrupt would be lost.  This is because either an APIC or PIC
interrupt would trash any pending interrupt event because INTR is only a state,
not an event queue.

Temporary fix: reworked apic.cc to have it's own copy of INTR state. cpu.cc now
checks for both cpu.INTR and local_apic.INTR.

Need to do further research to see if local_apic and pic can be integrated in such
a way as properly manage the combined effects of both devices accessing INTR state.
2002-10-05 10:25:31 +00:00
Kevin Lawton
66452e9898 Replaced tabs in cpu/*.{cc,h} files with spaces. 2002-10-04 17:04:33 +00:00
Kevin Lawton
f64eb0e16a Changed the hot countdown timer in pc_system.* files to be
32-bits rather than 64.  This is possible, because there is
  always an active null (heartbeat) timer, with periodicity
  of less than or equal to the maximum 32-bit int value.

  This generates a little less code in the hot part of cpu_loop,
  and saved about 3% execution time on a Win95 boot.

Moved the asynchronous handling code from cpu_loop() to its
  own function since it's a long path.  This neatened up the
  code a little (less gotos and all), and made it more clear
  to use a "while (1)" around the iterative code in cpu_loop().
2002-10-04 16:26:10 +00:00
Bryce Denney
75ce3842d2 - add GDB stub patch by Johan Rydberg 2002-10-03 05:14:50 +00:00
Peter Tattam
94b2dd2bc8 Cleanup of extdb.* files. included in right places now. 2002-10-01 04:13:12 +00:00
Kevin Lawton
67721c48f4 The convience functions protected_mode(), v8086_mode() and real_mode()
now simply return a cached value which is set upon mode changes.
  The biggest problem was protected_mode() which did something like:

    return CR0.PM && ! EFLAGS.VM

  This adds up when it was being executed many times in branch functions
  etc.  Now, cached values are set and sampled instead.
2002-09-29 22:38:18 +00:00
Stanislav Shwartsman
abb1530faf Fixed number of problems with instrumentation merge cause to instrumentation fail the compilation 2002-09-29 15:06:58 +00:00
Stanislav Shwartsman
8d99157993 Another additional for instrumentation 2002-09-29 14:16:30 +00:00
Stanislav Shwartsman
d495bd75a6 fter integration of SplitMod11b changes Bochs failed to compile in SMP mode.
I fixed the compilation errors in CVS, smbd please check if the fix is property;
2002-09-28 09:38:58 +00:00
Kevin Lawton
13a1e55f20 Committed patches/patch-bochs-instrumentation from Stanislav.
Some things changed in the ctrl_xfer*.cc, fetchdecode*.cc,
and cpu.cc since the original patches, so I did some patch
integration by hand.  Check the placement of the
macros BX_INSTR_FETCH_DECODE_COMPLETED() and BX_INSTR_OPCODE()
in cpu.cc to make sure I go them right.  Also, I changed the
parameters to BX_INSTR_OPCODE() to update them to the new code.
I put some comments before each of these to help determine if
the placement is right.

These macros are only compiled in if you are gathering instrumentation
data from bochs, so they shouldn't effect others.
2002-09-28 00:54:05 +00:00
Kevin Lawton
3c09fdb363 I updated code that was using !!get_CF() (or other arithmetic flag) to
use getB_CF() etc.  getB_CF() and friends are only for a relatively
  small number of cases where a true boolean/binary number (0 or 1) is required
  rather than 0 or non-0 as is returned by get_CF().
2002-09-24 18:33:38 +00:00
Kevin Lawton
41929b75bd Moved the "i = &iStorage" line inside the #ifdef bracketing
for iCache support.  It wouldn't hurt anything, but it
  makes the compiler complain of longjmp/fork issues.
2002-09-22 23:42:01 +00:00
Kevin Lawton
b742ccec7e Changed eflags accessors for get_?F() to use (val32 & (1<<N)) instead
of (1 & (val32>>N)), and added a getB_?F() accessor for special
  cases which need a strict binary value (exactly 0 or 1).  Most
  code only needed a value for logical comparison.  I modified the
  special cases which do need a binary number for shifting and
  comparison between flags, to use the special getB_?F() accessor.

Cleaned up memory.cc functions a little, now that all accesses
  are within a single page.

Fixed a (not very likely encountered) bug in fetchdecode.cc (and
  fetchdecode64.cc) where a 2-byte opcode starting with a prefix
  starts at the last offset on a page.  There were no checks
  on the segment overrides for a boundary condition.  I added them.

The eflags enhancements added just a tiny bit of performance.
2002-09-22 18:22:24 +00:00
Kevin Lawton
3bfeab23c9 Split out JZ/JNZ instructions from JCC because they were called
so frequently.
Coded asm() statements for INC/DEC_ERX() instructions.
Cleaned up the iCache a litle including a bug fix.  The
  generation ID was decrementing the whole field including
  some high meta bits.  That could roll over after 1 Billion
  cycles.  I know only decrement if the field is valid, to
  save the write.
I implemented inline functions which can serve the value of
  the arithmetic flags if they are cached, and redirect to
  the lazy_flags.cc routines if not.
Most of this was just prep work for adding more asm() statements
  for native eflags processing when on x86.
2002-09-22 01:52:21 +00:00
Kevin Lawton
402d02974d Moved the EFLAGS.RF check and clearing of inhibit_mask code
in cpu.cc out of the main loop, and into the asynchronous
events handling.  I went through all the code paths, and
there doesn't seem to be any reason for that code to be
in the hot loop.

Added another accessor for getting instruction data, called
modC0().  A lot of instructions test whether the mod field
of mod-nnn-rm is 0xc0 or not, ie., it's a register operation
and not memory.  So I flag this in fetchdecode{,64}.cc.
This added on the order of 1% performance improvement for
a Win95 boot.

Macroized a few leftover calls to Write_RMV_virtual_xyz()
that didn't get modified in the x86-64 merge.  Really, they
just call the real function for now, but I want to have them
available to do direct writes with the guest2host TLB pointers.
2002-09-20 03:52:59 +00:00
Kevin Lawton
0cd7346b9c - Added an instruction cache. Size is fixed for the moment,
but if you hand edit cpu/cpu.h, and change BxICacheEntries,
  you can try different sizes.  I'll make this more flexible
  with configure.  For now, use "--enable-icache" with no parameters.

- Modified fetchdecode.cc/fetchdecode64.cc just enough so that
  instructions which encode a direct address now use a memory
  resolution function which just sticks the immediate address
  into rm_addr.  With cached instructions we need this.
2002-09-19 19:17:20 +00:00
Kevin Lawton
4e51dcae40 Converted all the remaining available separate fields in bxInstruction_c
to bitfields.  bxInstruction_c is now 24 bytes, including 4 for
the memory addr resolution function pointer, and 4 for the
execution function pointer (16 + 4 + 4).

Coded more accessors, to abstract access from most code.
2002-09-18 08:00:43 +00:00
Kevin Lawton
6723ca9bf4 Moved more separate fields in the bxInstruction_c into bitfields
with accessors.  Had to touch a number of files to update the
access using the new accessors.

Moved rm_addr to the CPU structure, to slim down bxInstruction_c
and to prevent future instruction caching from getting sprayed
with writes to individual rm_addr fields.  There only needs to
be one.  Though need to deal with instructions which have
static non-modrm addresses, but which are using rm_addr since
that will change.

bxInstruction_c is down to about 40 bytes now.  Trying to
get down to 24 bytes.
2002-09-18 05:36:48 +00:00
Kevin Lawton
07b0df2a8a Updated accessing of modrm/sib addressing information to
use accessors.  This lets me work on compressing the
size of fetch-decode structure (now called bxInstruction_c).

I've reduced it down to about 76 bytes.  We should be able
to do much better soon.  I needed the abstraction of the
accessors, so I have a lot of freedom to re-arrange things
without making massive future changes.

Lost a few percent of performance in these mods, but my
main focus was to get the abstraction.
2002-09-17 22:50:53 +00:00
Kevin Lawton
80dd7a07ec Removed references to building libextdb.a. It doesn't seem to
be used at all, and Peter didn't want it.  "extdb.o" is compiled
into libcpu.a, if configured for it.

Removed a few #warnings for x86-64 compile, based on Peter's
line-item comments regarding the warnings I inserted during
the port/merge.
2002-09-15 15:10:21 +00:00
Kevin Lawton
0305a6a2fa (cpu64) Merged {cpu,cpu64}/cpu.h 2002-09-14 03:01:05 +00:00
Bryce Denney
5fc31bcfda - this revision changes the way eflags are accessed throughout the cpu and
cpu64 directories.  Instead of using the macros introduced in cpu.h rev 1.37
  such as GetEFlagsDFLogical and SetEFlagsDF and ClearEFlagsDF, I made inline
  methods on the BX_CPU_C object that access the eflags fields.  The problem
  with the macros is that they cannot be used outside the BX_CPU_C object.  The
  macros have now been removed, and all references to eflags now use these new
  accessors.
- I debated whether to put the accessors as members of the BX_CPU_C object
  or members of the bx_flags_reg_t struct.  I chose to make them members
  of BX_CPU_C for two reasons: 1. the lazy flags are implemented as
  members of BX_CPU_C, and 2. the eflags are referenced in many many places
  and it is more compact without having to put eflags in front of each.  (The
  real problem with compactness is having to write BX_CPU_THIS_PTR in front of
  everything, but that's another story.)
- Kevin pointed out a major bug in my set accessor code.  What a difference a
  little tilde can make!  That is fixed now.
- modified: load32bitOShack.cc debug/dbg_main.cc
  and in both cpu and cpu64 directories:
    cpu.cc cpu.h ctrl_xfer_pro.cc debugstuff.cc exception.cc flag_ctrl.cc
    flag_ctrl_pro.cc init.cc io.cc io_pro.cc proc_ctrl.cc soft_int.cc
    string.cc vm8086.cc
2002-09-12 18:10:46 +00:00
Bryce Denney
0fdbbae45b - integrate Peter Tattam's x86-64 emulation code into the main branch!
This adds a whole new directory cpu64 with the new emulation code.
  Very few changes were necessary outside cpu64.  To try it, configure
  with --enable-x86-64 and make.
- also this adds Peter Tattam's external debugger interface.
- modified files: Makefile.in bochs.h config.h.in configure.in
  load32bitOShack.cc logio.cc cpu/Makefile.in cpu/cpu.cc debug/dbg_main.cc
- added files: cpu/extdb.cc cpu/extdb.h and cpu64/*
2002-09-12 07:16:37 +00:00
Bryce Denney
f4818e6fa3 - bug fix from Peter Tattam that he describes as follows:
> This is the bug fix to make the reset button work properly when the cpu
  > is in the halt state.  There is another patch in init.cc as well to clear
  > async_event.  If you don't do this, if a cpu goes into HLT, the only thing
  > which will fix it is another interrupt.  The reset button won't work.
2002-09-12 06:29:13 +00:00
Kevin Lawton
0d7a5fdf3c I rehashed the way the EFLAGS register was stored internally.
All the EFLAGS bits used to be cached in separate fields.  I left
a few of them in separate fields for now - might remove them
at some point also.  When the arithmetic fields are known
(ie they're not in lazy mode), they are all cached in a
32-bit EFLAGS image, just like the x86 EFLAGS register expects.
All other eflags are store in the 32-bit register also, with
a few also mirrored in separate fields for now.

The reason I did this, was so that on x86 hosts, asm() statements
can be #ifdef'd in to do the calculation and get the native
eflags results very cheaply.  Just to test that it works, I
coded ADD_EdId() and ADD_EwIw() with some conditionally compiled
asm()s for accelerated eflags processing and it works.

-Kevin
2002-09-08 04:08:14 +00:00
Kevin Lawton
3f2d28f86c Added guest2host TLB tricks to read-modify-write variants of
access routines in access.cc, completing the upgrade of
those routines.  You do need '--enable-guest2host-tlb', before
you get the speedups for now.  The guest2host mods seem pretty
solid, though I do need to see what effects the A20 line has
on this cache and the paging TLB in general.
2002-09-03 04:54:28 +00:00
Kevin Lawton
746f09b427 There's a bug in the repeated IO & mem copy speedups. I
added --enable-repeat-speedups with default to disabled.
Reconfigure/recompile and the speedup code will be #ifdef'd
out for now.  It manifested as junk written to the VGA screen
while booting/running Windows.

Also made some more mods to the main cpu loop.  Moved the
handling of EXT/errorno outside the main loop, much like
the extra EIP/ESP commits were moved, for a little better
performance.

I changed the fetch_ptr/bytesleft method of fetching to
a slightly different model, which calculates a window
for which EIP will be valid (land on the current page),
and a bias which when applied to EIP will be from
0..upper_page_limit.  Speed is about the same for either
method, but a pseudo-op/threaded-interpreter will plug
in better with this and be faster.
2002-09-02 18:44:35 +00:00