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Home Page: https://bochs.sourceforge.io/
License: GNU Lesser General Public License v2.1
Bochs - Cross Platform x86 Emulator Project
Home Page: https://bochs.sourceforge.io/
License: GNU Lesser General Public License v2.1
Hello Bochs team,
I believe I have stumbled upon a bug while developing an ATA PIO driver for my toy operating system. My driver was polling the status register of the primary ATA device, and thus, clearing the interrupt, as I wasn't reading from the secondary.
My IRQs, as usual, are remapped from 0x20 for the Master PIC and from 0x28 for the Slave.
The following log shows a trace of the emulation of the operating system I'm developing. There are some additions and modifications to the log messages.
01759425355i[HD ] ASDF HARDDRV: raising interrupt 14 {DISK}
01759425355d[IOAPIC] set_irq_level(): INTIN14: level=1
01759425355i[PIC ] ASDF SLAVE IRQ line 14 now high <------- [1]
01759425355i[PIC ] ASDF slave irr: 40
01759425355i[PIC ] ASDF Interrupt requests: 40
01759425355i[PIC ] ASDF Interrupt mask: 0
01759425355i[PIC ] ASDF Unmasked Interrupts: 40
01759425355i[PIC ] ASDF signalling IRQ #14
01759425355i[PIC ] ASDF MASTER IRQ line 2 now high
01759425355i[PIC ] ASDF Interrupt requests: 5
01759425355i[PIC ] ASDF Interrupt mask: 0
01759425355i[PIC ] ASDF Unmasked Interrupts: 5
01759425489d[IOAPIC] set_irq_level(): INTIN14: level=0
01759425489i[PIC ] ASDF IRQ line 14 now low <------- [2]
01759479170i[CPU0 ] ASDF interrupt(): vector = 20, TYPE = 4, EXT = 0
01759479170d[CPU0 ] interrupt(): INTERRUPT TO SAME PRIVILEGE
01759482224i[PIC ] ASDF Interrupt requests: 5
01759482224i[PIC ] ASDF Interrupt mask: 0
01759482224i[PIC ] ASDF Unmasked Interrupts: 5
01759484885d[CPU0 ] inhibit interrupts mask = 1
01759484886d[CPU0 ] INTERRUPT RETURN TO SAME PRIVILEGE LEVEL
01759484894d[CPU0 ] inhibit interrupts mask = 1
01759484896i[CPU0 ] ASDF InterruptAcknowledge vector: 20
01759484896i[CPU0 ] ASDF interrupt(): vector = 20, TYPE = 0, EXT = 1
01759484896d[CPU0 ] interrupt(): INTERRUPT TO SAME PRIVILEGE
01759487949i[PIC ] ASDF Interrupt requests: 4
01759487949i[PIC ] ASDF Interrupt mask: 0
01759487949i[PIC ] ASDF Unmasked Interrupts: 4
01759487949i[PIC ] ASDF signalling IRQ #2 <------ [3]
01759490610d[CPU0 ] inhibit interrupts mask = 1
01759490611d[CPU0 ] INTERRUPT RETURN TO SAME PRIVILEGE LEVEL
01759490612i[PIC ] ASDF IAC SLAVE_IRQ: 6, SLAVE_OFFSET: 28, VECTOR: 2e (IRR: 0) <------ [4]
01759490612i[PIC ] ASDF IAC: SLAVE PIC SPURIUS!
01759490612i[CPU0 ] ASDF InterruptAcknowledge vector: 2f
01759490612p[CPU0 ] >>PANIC<< ASDF interrupt(): 2f
01759490612i[CPU0 ] ASDF interrupt(): vector = 2f, TYPE = 0, EXT = 1 <------- [5]
Has can be deduced from the log, if the IRQ#14 [1] goes low [2] before IRQ#2 is raised [3], Bochs will morph the lowered IRQ#14 interrupt into [4] an spurious IRQ#15 [5].
The aforementioned behavior is produced by line, which will morph any slave interrupt lowered, into an IRQ#15.
if ((BX_PIC_THIS s.slave_pic.irr & ~BX_PIC_THIS s.slave_pic.imr) == 0) {
return (BX_PIC_THIS s.slave_pic.interrupt_offset + 7);
}
I don't know if the behavior I'm describing is intended, but it feels smelly to me, although this has to be well-exercised code path. I'd also like to add that it has been driving me crazy because QEMU treated the interrupt as an IRQ#14.
The logging modifications I've made are available here
Best regards.
When executing in the guest: (does not intercept VMLOAD and VMSAVE)
VMLOAD
VMRUN
or
VMSAVE
VMRUN
When VMEXIT occurs in VMRUN, , vmcbptr will be incorrect.
Mouse cursor is not moving and console window is flooded with messages
[USBHID] DATA IN EP1: Packet Toggle indicator doesn't match Device Toggle indicator. 0 != 1
It was working fine in release version (2.7).
I can provide additional information if needed.
(And also now I can make binaries myself [with MSYS2])
Ping @fysnet.
After booting Windows 95, Skyroads was executed using MS-DOS mode, but Bochs terminated with SDL_OpenAudio() Failed displayed.
The steps to build x64 Bochs executable on Windows is running the those commands
$ sh .conf.win64-vcpp
$ make win32_snap
followed by opening vs2019\bochs.sln
on VS and building the solution.
This does not work with this error, due to _M_X64
not being defined.
config.h(94,1): fatal error C1189: #error: Bochs not configured for MSVC WIN32
The issue is that the VS projects are not configured for AMD64.
A quick fix is to add an x64 build configuration, based on x86 build configuration on VS GUI.
x64_config.patch.txt
I confirmed this let us build x64 bochs.exe, and it worked fine.
The diff is mess, as it duplicating the settings. We might want to delete all Condition=
attribute and unity the settings.
If we are okay to PR as the patch does (duplicating settings), I could do fairly soon (then we could clean up projects as a separate PR as I find time).
my code is here.
my step:
# bximage -func=create -hd=16M -imgmode="flat" -sectsize=512 -q hd.img
# nasm -I include/ -o mbr.bin mbr.s && dd if=mbr.bin of=./hd.img bs=512 count=1 conv=notrunc
# nasm -I include/ -o loader.bin loader.s && dd if=loader.bin of=./hd.img bs=512 count=4 seek=2 conv=notrunc
# qemu-system-i386 -hda hd.img -d cpu_reset,int -no-reboot
core code:
....
GDT_BASE: dd 0x00000000
dd 0x00000000
CODE_DESC: dd 0x0000FFFF
dd DESC_CODE_HIGH4
DATA_STACK_DESC: dd 0x0000FFFF
dd DESC_DATA_HIGH4
VIDEO_DESC: dd 0x80000007
dd DESC_VIDEO_HIGH4
times 60 dq 0 ; keep 60 empty slot,
GDT_SIZE equ $ - GDT_BASE
GDT_LIMIT equ GDT_SIZE - 1
SELECTOR_CODE equ (0x0001<<3) + TI_GDT + RPL0
SELECTOR_DATA equ (0x0002<<3) + TI_GDT + RPL0
SELECTOR_VIDEO equ (0x0003<<3) + TI_GDT + RPL0
gdt_ptr dw GDT_LIMIT
dd GDT_BASE
...
lgdt [gdt_ptr]
...
lgdt [gdt_ptr]
triggers a cpu reset, add cli
before the command, the problem disappears on bochs, but it is still on qemu-system-i386.
maybe the problem is times 60 dq 0
, because I didn't find information on how to check gdt.
Found with the help of MSVC debug library.
When two CDs are present, this line gets executed twice:
Bochs/bochs/iodev/hdimage/cdrom.cc
Line 54 in c1c102a
If I understand correctly, in Windows fd
value is faked and that's why descriptor 1
gets closed twice, leading to error.
This change allows to get rid of this error for me, but I'm not sure if it is correct.
diff --git a/bochs/iodev/hdimage/cdrom_win32.cc b/bochs/iodev/hdimage/cdrom_win32.cc
index 765b96ee7..8d4db03e9 100644
--- a/bochs/iodev/hdimage/cdrom_win32.cc
+++ b/bochs/iodev/hdimage/cdrom_win32.cc
@@ -147,6 +147,7 @@ cdrom_win32_c::~cdrom_win32_c(void)
if (fd >= 0) {
if (hFile != INVALID_HANDLE_VALUE)
CloseHandle(hFile);
+ fd = -1;
}
}
Version: a9a15d3.
By the way, I know about one more problem with CDs.
For some reason, image files are never closed for me, so I can't eject CD, modify image and insert it again.
If this short mention is not enough, I will probably make separate bug report about it in the future.
The current one fails to link plugins due the old libtool failing to link modern libcs.
On Windows XP SP3:
Enable magic-break-points with bochs debugger
It breaks every time, you cant continue (a lot of magic breakpoints):
(0) Magic breakpoint
(0) Magic breakpoint
(0) Magic breakpoint
(0) Magic breakpoint
(0) Magic breakpoint
(0) Magic breakpoint
bochsdbg.exe
========================================================================
Bochs x86 Emulator 2.7
Built from SVN snapshot on August 1, 2021
Timestamp: Sun Aug 1 10:07:00 CEST 2021
========================================================================
00000000000i[ ] reading configuration from .bochsrc
00000000000e[ ] .bochsrc:782: ataX-master/slave CHS set to 0/0/0 - autodetection enabled
00000000000e[ ] .bochsrc:783: ataX-master/slave CHS set to 0/0/0 - autodetection enabled
00000000000i[ ] Stopping on magic break points
00000000000i[ ] installing win32 module as the Bochs GUI
00000000000i[ ] using log file bochsout.txt
Next at t=0
(0) [0x0000fffffff0] f000:fff0 (unk. ctxt): jmpf 0xf000:e05b ; ea5be000f0
<bochs:1> c
(0) Magic breakpoint
Next at t=4287923
(0) [0x000000020264] 2000:0000000000000264 (unk. ctxt): jmp .+1 (0x00020267) ; eb01
<bochs:2> c
(0) Magic breakpoint
Next at t=4570603
(0) [0x000000020257] 2000:0000000000000257 (unk. ctxt): nop ; 90
<bochs:3> c
(0) Magic breakpoint
Next at t=4571118
(0) [0x000000020257] 2000:0000000000000257 (unk. ctxt): nop ; 90
<bochs:4> c
(0) Magic breakpoint
Next at t=4571699
(0) [0x000000020257] 2000:0000000000000257 (unk. ctxt): nop ; 90
<bochs:5> c
(0) Magic breakpoint
Next at t=4572761
(0) [0x000000020257] 2000:0000000000000257 (unk. ctxt): nop ; 90
<bochs:6> c
(0) Magic breakpoint
Next at t=4573864
(0) [0x000000020257] 2000:0000000000000257 (unk. ctxt): nop ; 90
<bochs:7> c
(0) Magic breakpoint
Next at t=4575039
(0) [0x000000020257] 2000:0000000000000257 (unk. ctxt): nop ; 90
<bochs:8>
Set the intercept_shutdown_events bit in VMCB, and guest executes the following instructions:
645: 31 c0 xor eax,eax
647: 89 44 24 f8 mov DWORD PTR [rsp-0x8],eax
64b: 89 44 24 fc mov DWORD PTR [rsp-0x4],eax
64f: 0f 01 5c 24 f8 lidt [rsp-0x8]
654: bc 01 00 00 00 mov esp,0x1
659: 50 push eax
65a: eb fe jmp 65a <s32+0x43>
Bochs does not have vmexit.
bochsout.txt:
01203100000p[XGUI ] >>PANIC<< POWER button turned off.
01203100000i[CPU0 ] CPU is in protected mode (active)
01203100000i[CPU0 ] CS.mode = 32 bit
01203100000i[CPU0 ] SS.mode = 32 bit
01203100000i[CPU0 ] EFER = 0x00001000
01203100000i[CPU0 ] | EAX=00000000 EBX=00009400 ECX=c0000080 EDX=55aa55aa
01203100000i[CPU0 ] | ESP=fffffffd EBP=00000000 ESI=00005178 EDI=0000a000
01203100000i[CPU0 ] | IOPL=0 id vip vif ac vm rf nt of df if tf sf ZF af PF cf
01203100000i[CPU0 ] | SEG sltr(index|ti|rpl) base limit G D
01203100000i[CPU0 ] | CS:0008( 0001| 0| 0) 00000000 ffffffff 1 1
01203100000i[CPU0 ] | DS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
01203100000i[CPU0 ] | SS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
01203100000i[CPU0 ] | ES:0010( 0002| 0| 0) 00000000 ffffffff 1 1
01203100000i[CPU0 ] | FS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
01203100000i[CPU0 ] | GS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
01203100000i[CPU0 ] | EIP=0000065a (0000065a)
01203100000i[CPU0 ] | CR0=0x00000031 CR2=0x00000000
01203100000i[CPU0 ] | CR3=0x00000000 CR4=0x00000000
01203100000i[CPU0 ] 0x000000000000065a>> jmp .-2 (0x0000065a) : EBFE
Testing with INT n (replacing mov, esp, 1) instruction resulted in bochs restarting.
00316416108e[CPU0 ] interrupt(): vector must be within IDT table limits, IDT.limit = 0x0
00316416108e[CPU0 ] interrupt(): vector must be within IDT table limits, IDT.limit = 0x0
00316416108e[CPU0 ] interrupt(): vector must be within IDT table limits, IDT.limit = 0x0
00316416108i[CPU0 ] CPU is in protected mode (active)
00316416108i[CPU0 ] CS.mode = 32 bit
00316416108i[CPU0 ] SS.mode = 32 bit
00316416108i[CPU0 ] EFER = 0x00001000
00316416108i[CPU0 ] | EAX=00000000 EBX=00009400 ECX=c0000080 EDX=55aa55aa
00316416108i[CPU0 ] | ESP=00004000 EBP=00000000 ESI=0000517a EDI=0000a000
00316416108i[CPU0 ] | IOPL=0 id vip vif ac vm RF nt of df if tf sf ZF af PF cf
00316416108i[CPU0 ] | SEG sltr(index|ti|rpl) base limit G D
00316416108i[CPU0 ] | CS:0008( 0001| 0| 0) 00000000 ffffffff 1 1
00316416108i[CPU0 ] | DS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
00316416108i[CPU0 ] | SS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
00316416108i[CPU0 ] | ES:0010( 0002| 0| 0) 00000000 ffffffff 1 1
00316416108i[CPU0 ] | FS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
00316416108i[CPU0 ] | GS:0010( 0002| 0| 0) 00000000 ffffffff 1 1
00316416108i[CPU0 ] | EIP=00000654 (00000654)
00316416108i[CPU0 ] | CR0=0x00000031 CR2=0x00000000
00316416108i[CPU0 ] | CR3=0x00000000 CR4=0x00000000
00316416108i[CPU0 ] 0x0000000000000654>> int 0x00 : CD00
00316416108e[CPU0 ] exception(): 3rd (13) exception with no resolution, shutdown status is 00h, resetting
Hello, just to put some context to it, i'm trying to start up an OS on my own, i'm following a couple of guides like The little book about OS development and Roll your own toy UNIX-clone OS along with a couple of other resources, i have everything set up up to the point of having a basic bootable piece of code but the problem is that when i try to run bochs
it opens up and hangs indefinitely with no message, the weird thing is that if don't touch anything it stays there, but when try to move the window it shows an error like the one in the screenshot:
here is the repo where i have everything uploaded, maybe somebody is able to reproduce the error (i really hope is something that i'm doing wrong)
Note: i'm running bochs
under Ubuntu 22.04.3 that's running in a Virtual Machine (VirtualBox) with 4GB RAM, 2 Processors, 25GB Disk.
Thanks in advance to anyone that takes some time to take a look at this
SPP:
While compiling with instrumentation support ( ./configure --enable-instrumentation="instrument/example0" ) i get the following error:
cd instrument/example0 && \
make libinstrument.a
make[1]: Entering directory '/home/hypervisor_dev/real_soft/Bochs/bochs/instrument/example0'
c++ -c -I../.. -I./../.. -I. -I./. -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -Wall -O3 -fomit-frame-pointer -pipe -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES instrument.cc -o instrument.o
instrument.cc: In function ‘void bx_print_instruction(unsigned int, const instruction_t*)’:
instrument.cc:84:3: error: ‘bx_dbg_disasm_wrapper’ was not declared in this scope
84 | bx_dbg_disasm_wrapper(i->is32, i->is64, 0, 0, i->opcode, disasm_tbuf);
| ^~~~~~~~~~~~~~~~~~~~~
make[1]: *** [Makefile:51: instrument.o] Error 1
make[1]: Leaving directory '/home/hypervisor_dev/real_soft/Bochs/bochs/instrument/example0'
make: *** [Makefile:363: instrument/example0/libinstrument.a] Error 2
There are also problems while compiling other examples.
My system runs Ubuntu on WSL.
P.s I think we also need more examples covering the instrumentation topic.
When I create config file with GUI and then open it - it fails to load:
directive 'port_e9_hack_all_rings' not understood
error appears.
Problem looks easily reproducible, but if not, I will provide additional information.
Version: 221cac7
If I enable usb_uhci
plugin and enable USB keyboard, when I click on Suspend and select directory, crash happens:
Version: 221cac7
The current source does not restore the Configuration Interface on a restore.
The bx_real_sim_c::restore_config() reads in the saved bochrc file, parsing the "config_interface:" line.
Then in config.cc,
if (!SIM->get_param_enum(BXPN_SEL_CONFIG_INTERFACE)->set_by_name(params[1]))
PARSE_ERR(("%s: config_interface '%s' not available", context, params[1]));
Tries to set the configuration interface.
However, since the get_param_enum(BXPN_SEL_CONFIG_INTERFACE) is not enabled, it doesn't set it to the found interface.
get_param_enum(BXPN_SEL_CONFIG_INTERFACE)->get_enabled() returns 0.
paramtree.cc:
void bx_param_num_c::set(Bit64s newval)
{
if (!enabled) return;
returns instead of setting the restored interface.
Therefore, the restore reverts to the textconfig interface instead of the found interface ("win32config" in my case).
The (BXPN_SEL_CONFIG_INTERFACE) gets disabled in main.cc, line 334 before we read in the bochrc file (when restoring a sim),
and after reading the bochrc file when starting a new sim.
env: Ubuntu 22.04
boot.asm:
org 07C00h
mov ax, cs
mov ds, ax
mov es, ax
call DispStr
jmp $
DispStr:
mov ax, BootMessage
mov bp, ax
mov cx, 16
mov ax, 01301h
mov bx, 000Ch
mov dl, 0
int 10h
ret
BootMessage: db "Hello,OS world!"
times 510-($-$$) db 0
dw 0xaa55
bochsrc:
# how much memorythe emulated machine will have
megs: 32
# filename of ROMimages
romimage:file=/usr/share/bochs/BIOS-bochs-latest
vgaromimage:file=/usr/share/vgabios/vgabios.debug.bin
# what disk imageswill be used
floppya:1_44=test.img, status=inserted
# choose the bootdisk.
boot: floppy
# where do we sendlog messages?
log: bochsout.txt
# disable themouse
mouse: enabled=0
# enable keymapping, using Us layout as default
keyboard:keymap=/usr/share/bochs/keymaps/x11-pc-us.map
display_library:x
bochs:
$ nasm boot.asm -o boot.bin
$ dd if=boot.bin of=test.img bs=512 count=1 conv=notrunc
$ bochs -f bochsrc.conf
00000000000i[ ] LTDL_LIBRARY_PATH not set. using compile time default '/usr/lib/x86_64-linux-gnu/bochs/plugins'
========================================================================
Bochs x86 Emulator 2.7
Built from SVN snapshot on August 1, 2021
Timestamp: Sun Aug 1 10:07:00 CEST 2021
========================================================================
00000000000i[ ] BXSHARE not set. using compile time default '/usr/share/bochs'
00000000000i[ ] lt_dlhandle is 0x55def313df20
00000000000i[PLUGIN] loaded plugin libbx_iodebug.so
00000000000i[ ] lt_dlhandle is 0x55def313e1c0
00000000000i[PLUGIN] loaded plugin libbx_unmapped.so
00000000000i[ ] lt_dlhandle is 0x55def3116d80
00000000000i[PLUGIN] loaded plugin libbx_parallel.so
00000000000i[ ] lt_dlhandle is 0x55def30fabd0
00000000000i[PLUGIN] loaded plugin libbx_gameport.so
00000000000i[ ] lt_dlhandle is 0x55def30fb410
00000000000i[PLUGIN] loaded plugin libbx_extfpuirq.so
00000000000i[ ] lt_dlhandle is 0x55def30fbc50
00000000000i[PLUGIN] loaded plugin libbx_serial.so
00000000000i[ ] lt_dlhandle is 0x55def30ffe30
00000000000i[PLUGIN] loaded plugin libbx_biosdev.so
00000000000i[ ] lt_dlhandle is 0x55def3100810
00000000000i[PLUGIN] loaded plugin libbx_speaker.so
00000000000i[ ] reading configuration from 3.conf
00000000000i[ ] lt_dlhandle is 0x55def31416e0
00000000000i[PLUGIN] loaded plugin libbx_textconfig.so
00000000000i[ ] lt_dlhandle is 0x55def3141eb0
00000000000i[PLUGIN] loaded plugin libbx_x_gui.so
00000000000i[ ] installing x module as the Bochs GUI
00000000000i[ ] using log file bochsout.txt
Next at t=0
(0) [0x0000fffffff0] f000:fff0 (unk. ctxt): jmpf 0xf000:e05b ; ea5be000f0
<bochs:1> c
bx_dbg_read_linear: physical memory read error (phy=0x0000322f3130, lin=0x00000000322f3130)
Next at t=698966
(0) [0x0000fffffff0] f000:fff0 (unk. ctxt): jmpf 0xf000:e05b ; ea5be000f0
<bochs:2> exit
(0).[698966] [0x0000fffffff0] f000:fff0 (unk. ctxt): jmpf 0xf000:e05b ; ea5be000f0
bochs can't print "Hello,OS world!". And 0x0000322f3130≈803M > megs(32M), what's wrong?
qemu-system-x86_64 -fda test.img
is works.
The make and build fails for two issues.
The first issue looks like this.
% sh .conf.macosx
checking build system type... x86_64-apple-darwin21.6.0
checking host system type... x86_64-apple-darwin21.6.0
checking target system type... x86_64-apple-darwin21.6.0
checking if you are configuring for another platform... no
checking for standard CFLAGS on this platform... -fpascal-strings -fno-common -Wno-four-char-constants -Wno-unknown-pragmas -Dmacintosh
checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in `/Users/standa/Desktop/class/Bochs/bochs':
configure: error: C compiler cannot create executables
See `config.log' for more details
clang: error: unknown argument: '-falign-loops-max-skip=15'
clang: error: unknown argument: '-falign-jumps-max-skip=15'
A fix (along with resolving warnings) is alike this.
-CFLAGS="-pipe -O3 -I/sw/include -fomit-frame-pointer -finline-functions -falign-loops=16 -falign-jumps=16 -falign-functions=16 -falign-labels=16 -falign-loops-max-skip=15 -falign-jumps-max-skip=15 -fprefetch-loop-arrays $CFLAGS"
+CFLAGS="-pipe -O3 -I/sw/include -fomit-frame-pointer -finline-functions $CFLAGS"
This leads us to the 2nd problem.
In file included from init.cc:25:
./cpu.h:4544:233: error: use of undeclared identifier 'nullptr'
BX_SMF bx_phy_address translate_guest_physical(bx_phy_address guest_paddr, bx_address guest_laddr, bool guest_laddr_valid, bool is_page_walk, unsigned user_page, unsigned rw, bool supervisor_shadow_stack = false, bool *spp_walk = nullptr);
^
1 warning and 1 error generated.
make[1]: *** [init.o] Error 1
make: *** [cpu/libcpu.a] Error 2
This nullptr
is only one place used in the entire code base, and an easy "fix" is to make it NULL
.
What I am unsure is if macOS compiling without C++11 enabled is intentional, since other platform compiles this (ie, uses C++11), and wonder a proper fix is to update configuration files so that it starts building with C++11 enabled (which I am not sure how to)
As a ref, here is the compiler versions. This mac is almost clean install, besides I installed XCode.
% gcc --version
Apple clang version 13.1.6 (clang-1316.0.21.2.5)
Target: x86_64-apple-darwin21.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
% g++ --version
Apple clang version 13.1.6 (clang-1316.0.21.2.5)
Target: x86_64-apple-darwin21.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
Text, which is displayed after starting Commander Keen 5, should not have horizontal movement.
Similar problem also occurs with VirtualBox 6.1.36.
However, VMware Workstation 12.5.2 shows animation correctly:
Version: c48a501
When I try to save and then restore state of machine, I encounter several problems:
ata0-0: could not open hard drive image file 'hd10meg.img'
cannot find param 'blk64'!
I tested dlxlinux4.tar.gz: started machine, clicked Suspend, selected directory, selected No, restarted Bochs, clicked Restore State and selected the same directory.
Version: 221cac7
When I execute command format a:
in Windows 2000 (or Windows XP), Bochs shows error could not perform lseek() to -512 on floppy image file
.
Version: 75d076b.
When I build Bochs without --enable-evex
, errors appear.
Such configuration worked correctly several days ago.
g++ -c -I.. -I./.. -I../instrument/stubs -I./../instrument/stubs -DWIN32 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -O3 -Wall -Wno-format -mno-ms-bitfields -DWIN32 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES load.cc -o load.o
g++ -c -DWIN32 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -I.. -I./.. -I../iodev -I./../iodev -I../instrument/stubs -I./../instrument/stubs -O3 -Wall -Wno-format -mno-ms-bitfields -DWIN32 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES win32.cc -o win32.o
g++ -c -I.. -I./.. -I../instrument/stubs -I./../instrument/stubs -DWIN32 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES -O3 -Wall -Wno-format -mno-ms-bitfields -DWIN32 -D_FILE_OFFSET_BITS=64 -D_LARGE_FILES data_xfer8.cc -o data_xfer8.o
load.cc:206:23: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_32BIT_OPMASK(i->opmask()) : 0xffffffff;
~ ^
load.cc:206:40: error: no member named 'opmask' in 'BX_CPU_C'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_32BIT_OPMASK(i->opmask()) : 0xffffffff;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./cpu.h:214:54: note: expanded from macro 'BX_READ_32BIT_OPMASK'
#define BX_READ_32BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].dword.erx)
~~~~~~~~~~~~~~~ ^
load.cc:206:64: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_32BIT_OPMASK(i->opmask()) : 0xffffffff;
~ ^
./cpu.h:214:61: note: expanded from macro 'BX_READ_32BIT_OPMASK'
#define BX_READ_32BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].dword.erx)
^~~~~
load.cc:223:23: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_16BIT_OPMASK(i->opmask()) : 0xffff;
~ ^
load.cc:223:40: error: no member named 'opmask' in 'BX_CPU_C'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_16BIT_OPMASK(i->opmask()) : 0xffff;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./cpu.h:213:54: note: expanded from macro 'BX_READ_16BIT_OPMASK'
#define BX_READ_16BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.rx)
~~~~~~~~~~~~~~~ ^
load.cc:223:64: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_16BIT_OPMASK(i->opmask()) : 0xffff;
~ ^
./cpu.h:213:61: note: expanded from macro 'BX_READ_16BIT_OPMASK'
#define BX_READ_16BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.rx)
^~~~~
load.cc:240:23: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
~ ^
load.cc:240:40: error: no member named 'opmask' in 'BX_CPU_C'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./cpu.h:212:54: note: expanded from macro 'BX_READ_8BIT_OPMASK'
#define BX_READ_8BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.byte.rl)
~~~~~~~~~~~~~~~ ^
load.cc:240:63: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
~ ^
./cpu.h:212:61: note: expanded from macro 'BX_READ_8BIT_OPMASK'
#define BX_READ_8BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.byte.rl)
^~~~~
load.cc:282:23: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_16BIT_OPMASK(i->opmask()) : 0xffff;
~ ^
load.cc:282:40: error: no member named 'opmask' in 'BX_CPU_C'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_16BIT_OPMASK(i->opmask()) : 0xffff;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./cpu.h:213:54: note: expanded from macro 'BX_READ_16BIT_OPMASK'
#define BX_READ_16BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.rx)
~~~~~~~~~~~~~~~ ^
load.cc:282:64: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_16BIT_OPMASK(i->opmask()) : 0xffff;
~ ^
./cpu.h:213:61: note: expanded from macro 'BX_READ_16BIT_OPMASK'
#define BX_READ_16BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.rx)
^~~~~
load.cc:299:23: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
~ ^
load.cc:299:40: error: no member named 'opmask' in 'BX_CPU_C'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./cpu.h:212:54: note: expanded from macro 'BX_READ_8BIT_OPMASK'
#define BX_READ_8BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.byte.rl)
~~~~~~~~~~~~~~~ ^
load.cc:299:63: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
~ ^
./cpu.h:212:61: note: expanded from macro 'BX_READ_8BIT_OPMASK'
#define BX_READ_8BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.byte.rl)
^~~~~
load.cc:342:23: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
~ ^
load.cc:342:40: error: no member named 'opmask' in 'BX_CPU_C'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./cpu.h:212:54: note: expanded from macro 'BX_READ_8BIT_OPMASK'
#define BX_READ_8BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.byte.rl)
~~~~~~~~~~~~~~~ ^
load.cc:342:63: error: no member named 'opmask' in 'bxInstruction_c'
Bit32u opmask = (i->opmask() != 0) ? BX_READ_8BIT_OPMASK(i->opmask()) : 0xff;
~ ^
./cpu.h:212:61: note: expanded from macro 'BX_READ_8BIT_OPMASK'
#define BX_READ_8BIT_OPMASK(index) (BX_CPU_THIS_PTR opmask[index].word.byte.rl)
^~~~~
18 errors generated.
make[1]: *** [Makefile:152: load.o] Error 1
Version: f455fa8.
The following AVX-512 opcodes missing mask support at load operation.
As result these operations do not have 'masked fault suppression' feature.
bx_define_opcode(BX_IA_V512_VPMOVSXBW_VdqWdq_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VPMOVSXBW_MASK_VdqWdqR, BX_ISA_AVX512_BW, OP_Vdq, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVSXBD_VdqWdq_Kmask, &BX_CPU_C::LOAD_Quarter_Vector, &BX_CPU_C::VPMOVSXBD_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVQV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVSXBQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Oct_Vector, &BX_CPU_C::VPMOVSXBQ_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVOV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVSXWD_VdqWdq_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VPMOVSXWD_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVSXWQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Quarter_Vector, &BX_CPU_C::VPMOVSXWQ_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVQV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVSXDQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VPMOVSXDQ_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVZXBW_VdqWdq_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VPMOVZXBW_MASK_VdqWdqR, BX_ISA_AVX512_BW, OP_Vdq, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVZXBD_VdqWdq_Kmask, &BX_CPU_C::LOAD_Quarter_Vector, &BX_CPU_C::VPMOVZXBD_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVQV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVZXBQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Oct_Vector, &BX_CPU_C::VPMOVZXBQ_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVOV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVZXWD_VdqWdq_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VPMOVZXWD_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVZXWQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Quarter_Vector, &BX_CPU_C::VPMOVZXWQ_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVQV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPMOVZXDQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VPMOVZXDQ_MASK_VdqWdqR, BX_ISA_AVX512, OP_Vdq, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VCVTPH2PS_VpsWps_Kmask, &BX_CPU_C::LOAD_Half_Vector, &BX_CPU_C::VCVTPH2PS_MASK_VpsWpsR, BX_ISA_AVX512, OP_Vps, OP_mVHV, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_BROADCAST)
EDIT: Fixed git tag 02c4f85
Also need to understand what is the fault suppression story for following opcodes:
bx_define_opcode(BX_IA_V512_VPEXPANDD_VdqWdq_Kmask, &BX_CPU_C::LOAD_Vector, &BX_CPU_C::VEXPANDPS_MASK_VpsWpsR, BX_ISA_AVX512, OP_Vdq, OP_mVdq32, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPEXPANDQ_VdqWdq_Kmask, &BX_CPU_C::LOAD_Vector, &BX_CPU_C::VEXPANDPD_MASK_VpdWpdR, BX_ISA_AVX512, OP_Vdq, OP_mVdq64, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VEXPANDPS_VpsWps_Kmask, &BX_CPU_C::LOAD_Vector, &BX_CPU_C::VEXPANDPS_MASK_VpsWpsR, BX_ISA_AVX512, OP_Vps, OP_mVps32, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VEXPANDPD_VpdWpd_Kmask, &BX_CPU_C::LOAD_Vector, &BX_CPU_C::VEXPANDPD_MASK_VpdWpdR, BX_ISA_AVX512, OP_Vpd, OP_mVpd64, OP_NONE, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
bx_define_opcode(BX_IA_V512_VPSHUFBITQMB_KGqHdqWdq_Kmask, &BX_CPU_C::LOAD_Vector, &BX_CPU_C::VPSHUFBITQMB_MASK_KGqHdqWdqR, BX_ISA_AVX512_BITALG, OP_KGq, OP_Hdq, OP_mVdq, OP_NONE, BX_PREPARE_EVEX_NO_SAE | BX_PREPARE_EVEX_NO_BROADCAST)
When running JiZZ, in some scenes diagonal lines appears, which should not be there.
For example in this one:
This is how it should look like:
https://www.youtube.com/watch?v=iXgseVYvhek&t=93
Sadly I was not able to confirm proper behaviour with my real hardware because of video card incompatibility.
Test files: jizz.zip.
Version: 75d076b.
Not sure if it is bug or not, but definitely a problem.
When I boot DOS 6.22 with emm386.exe
specified in config.sys
, Bochs starts lagging and flooding logs with messages like
01104191449e[CPU0 ] interrupt(): gate descriptor is not valid sys seg (vector=0x1a)
01104191721e[CPU0 ] interrupt(): gate descriptor is not valid sys seg (vector=0x16)
01104191904e[CPU0 ] interrupt(): gate descriptor is not valid sys seg (vector=0x16)
01104192051e[CPU0 ] interrupt(): gate descriptor is not valid sys seg (vector=0x1a)
01104192241e[CPU0 ] interrupt(): gate descriptor is not valid sys seg (vector=0x16)
01104192433e[CPU0 ] interrupt(): gate descriptor is not valid sys seg (vector=0x28)
IPS drops from 75M to 0.09M (when logging to console, -
) or 16M (when logging to nul
).
Files needed to reproduce this problem are in archive dos_emm.zip.
Version: f455fa8.
As shown in the FIFA2000 screenshot above, emulation does not work properly in some 3dfx supported games.
For example, in FIFA 2000, the screen is blacked out, but if you move the cursor, the original screen is displayed along the cursor. Also, in Tomb Raider 1, in-game textures do not display and menu text is displayed incorrectly to the point of being unreadable.
Version: 2.7
Host OS: Windows 7 SP1 x64
To reproduce problem, start following config file:
plugin_ctrl: usb_uhci=true
usb_uhci: enabled=1, port1=mouse, options1=none, port2=keyboard, options2=none
Then select "Kill simulation" when "No bootable device" error appears.
Result:
Also I noticed another crash, not sure if it is related (probably not), but will show it anyway (I don't know how to reproduce it):
Once operating system is loaded, it is not possible anymore to change CD.
Log message tells than new image is loaded, but OS still sees previous data in CD drive.
Here is test image with DOS: CD.zip, but I also noticed the same behaviour with Windows XP.
Version: e896e71 (or very close to it, do not remember exactly)
When I try to install AIMP 4.00.1687 into Windows XP SP3, Bochs crashes, probably with stack overflow:
Here is CD image from which I installed this software: aimp.iso.zip.
Version: fb6dae6
When I try to load Windows XP SP3 with default Voodoo 3 drivers, one of two things happens:
>>PANIC<< APIC read at address 0x0000fee00081 spans 32-bit boundary !
;TSS selector points to bad TSS
.This problem start to appear after updating from 620d091 to f5b54a4.
Most likely, f5b54a4 is not direct cause of the problem, but it uncovers problem somehow.
Hello!
My suggestion is to convert the Docbook files to Asciidoc or Commonmark, since they are easier to use and more versatile.
If anything, I can start this as soon as possible.
When I try to select different VGA BIOS image (click on "Browse..." button), error appears:
Most likely, it happens because of incorrect slash /
used in path:
Line 858 in 2baa18d
My OS is Windows 7 SP1 x64
The final assignment of A/B/C/D to the destination is
op1.xmm32u(0) = A[4];
op1.xmm32u(1) = B[4];
op1.xmm32u(2) = C[4];
op1.xmm32u(3) = D[4];
According to Intel manuals it should be in the opposite direction (A in op1.xmm32u(3)
, all the way down to D in op1.xmm32u(0)
), similar to the initial assignment:
A[0] = op1.xmm32u(3);
B[0] = op1.xmm32u(2);
C[0] = op1.xmm32u(1);
D[0] = op1.xmm32u(0);
These seem generic enough to warrant an upstream issue.
First, there's a c++11 style const member initializer at cpu/icache.h:31
. Compiling on Leopard/PPC fails with the error "ISO C++ forbids initialization of member ‘PHY_MEM_PAGES’". Patch follows.
--- cpu/icache.h.orig 2023-07-27 10:22:33.000000000 -0700
+++ cpu/icache.h 2023-07-27 10:25:55.000000000 -0700
@@ -28,11 +28,11 @@
class bxPageWriteStampTable
{
- const Bit32u PHY_MEM_PAGES = 1024*1024;
+ const Bit32u PHY_MEM_PAGES;
Bit32u *fineGranularityMapping;
public:
- bxPageWriteStampTable() {
+ bxPageWriteStampTable() : PHY_MEM_PAGES(1024*1024) {
fineGranularityMapping = new Bit32u[PHY_MEM_PAGES];
resetWriteStamps();
}
Second, there's an #if
directive at iodev/display/voodoo_func.h:1630
that causes compilation to fail with "#if with no expression". Should this instead be #ifdefine
?
While working with the USB Hub emulation, I found that there is an issue with the Toggle Control when a device is attached to the OHCI. I never noticed this before.
I will investigate further and hopefully have a PR to fix it.
In the mean-time, please set:
#define HANDLE_TOGGLE_CONTROL 0
so the OHCI works as expected.
Ben
implement according to CET spec v3.0
SMM save/restore flows: Updates to Chapter 34, Volume 3C
I decided to check how fast Bochs will work with --enable-all-optimizations
option.
I made tests previously without it.
But what I found is that very often it just crashes:
This is stack overflow exception.
In this case, it happened with TinyCore-current.iso.
This is how my options looks like now:
./configure --enable-static --enable-all-optimizations --enable-x86-64 --enable-vmx=2 --enable-avx --enable-clgd54xx --enable-voodoo --enable-ne2000 --enable-e1000 --enable-sb16 --enable-es1370 --enable-usb --enable-usb-ohci --enable-usb-ehci --enable-usb-xhci --enable-busmouse
(--enable-static
is my hack)
I use clang version 15.0.7 compiler with MSYS2.
Bochs version: 2928315
Originally posted by Vort October 18, 2023
Hello.
I was using teac_cdi.sys
driver with DOS for a long time.
It always worked for me, both on real hardware and with virtual machines.
But I can't get it to work with Bochs for some reason.
Not sure if because of some my mistake or because of bugs in Bochs.
Can anyone look at my virtual machine (bochs_dos_cd.zip) and say what's wrong with CD support there?
Bochs needs multicore processing to see that with a single core the emulated system drowns.
I tried to install Sfft1.9.zip drivers for Voodoo 3 to Windows XP.
After restart, guest resolution for some reason changed to 1920x1200.
Because host resolution is 1280x1024, image not fits and Bochs crashes.
Crash also happens with default Windows XP drivers for Voodoo 3 if I set 1920x1200 resolution manually.
Crash most likely happens on this line:
Bochs/bochs/iodev/display/voodoo.cc
Line 788 in 83c71dd
if (xc >= 1280 || yc >= 1024) continue;
earlier, no crash happen.To properly reproduce this problem, something should be done with #120. upd. ← this thing is solved.
You guys should make a Discord server or something similar
Hi! I've tried to make a vector version of the Bochs logo. Here it is:
Here is the svg version: https://commons.wikimedia.org/wiki/File:Bochs_Vector_Logo.svg
What do you think? I am open to recommendations.
VMX guest executes the following instructions.
push 0x102
popfq
cpuid
Jmp $+ 2
On the real machine, the BS bit is 0.
I dump mbr/boot sector from USB flash. Primary partition was align by 1 Mb.
Copy all files to local dir and make vvfat disk.
But after start bochs is crashed.
Quick look on source code:
./vvfat.cc:
first_sectors = new Bit8u[0xc000]; // allocate too small memory :(
Next changes will be fix the problem :
vvfat_image_t::vvfat_image_t(Bit64u size, const char* _redolog_name)
{
const size_t first_sectors_count = 4096;
const size_t first_sectors_size = first_sectors_count * 0x200;
//const size_t first_sectors_size = 0xC000;
if (sizeof(bootsector_t) != 512) {
BX_FATAL(("system error: invalid bootsector structure size"));
}
first_sectors = new Bit8u[first_sectors_size];
memset(&first_sectors[0], 0, first_sectors_size);
...
PS Can be better check size of allocated first_sectors ...
If I have a considerably large VHD file, ~32Gig used/128Gig total usable size, Bochs returns a PANIC at line 325 in harddrv.cc
BX_PANIC(("ata%d-%d: could not open hard drive image file '%s'", channel, device, SIM->get_param_string("path", base)->getptr()));
The offending code is in vpc.cc, line 173:
if (sector_count >= 65535 * 16 * 255) {
bx_close_image(fd, pathname);
return -EFBIG;
}
I understand that the VHD specification states that a CHS value limit is 65535/16/63. However, this doesn't mean that Bochs shouldn't be able to access up to the actual 2TB limitation of the VHD when reading sectors, correct?
Therefore, what is the reason for the check at line 173 in vpc.cc shown above? I don't believe it is needed, unless there is somewhere in the Bochs source that relies on the limitation of a CHS value of 65535/16/63. The only limitation would be in the BIOS and it can't access anything past the 1024/254/63 mark anyway, right?
However, if it is actually needed, an additional error to the log file might be warranted. Maybe something like:
if (sector_count >= 65535 * 16 * 255) {
bx_close_image(fd, pathname);
BX_ERROR(("VHD file too large: " FMT_LL "u", sector_count));
return -EFBIG;
}
Thank you,
Ben
When simulation is started with clock: sync=realtime
, there is several seconds delay until BIOS messages appear.
This delay can be seen in logs here:
00000688828i[WINGUI] dimension update x=720 y=400 fontheight=16 fontwidth=9 bpp=8
00346804888i[BIOS ] Found 1 cpu(s)
If I replace --enable-all-optimizations
with --enable-repeat-speedups --enable-fast-function-calls
, then Found 1 cpu(s)
appears way earlier:
00000518347i[BIOS ] Found 1 cpu(s)
Here is "empty" configuration, which allows to see this problem: empty.zip.
Version: fde226f
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