The fonts used on a real machine for the VGA text modes may well be different. They are right there in the Bochs/VirtualBox/Plex86 source code, beneath a big comment saying where they came from.įntcol16 has an 8×16 font, as used for VGA 25 line text modes an 8×14 font and an 8×8 font as used for VGA 50 line text modes. - Open source client tools.The in-ROM VGA fonts supplied in the firmwares of both Bochs and VirtualBox - the Plex86/Bochs VGA firmware - are the VGA fonts ( VGA-ROM.F?) from Joseph Gil's fntcol16.zip package.- VMware engineer describes how to debug Linux kernel with debug stub.- A description of a problem encountered using VMware on AMD Opteron RevC processors.Engineers are present if asked politely, some will provide very exact technical details VisualKernel supports debugging Linux kernels from Visual Studio with VMWare gdb stub.IDA Pro supports debugging Windows kernels via the VMWare stub. ![]() Sometimes this represents a bug in VMware's emulation usually, this represents a bug in your kernel.Īs a virtualization product aimed at regular users, VMware provides a number of facilities through its "tools" package for major OSes, such as absolute mouse positioning and display resizing. On beta products, however, a guest triple fault results in Bug 19580. VMware products emulate a triple fault by resetting the machine. bios.bootDelay = "3000" # Delay booting the BIOS code.debugStub.hideBreakpoints = "TRUE" # Enables the use of hardware breakpoints instead of software (INT3) breakpoints.bugOnStartGuest32 = "TRUE" # Breaks into debug stub on first instruction (warning: in BIOS!) # This will halt the VM at the very first instruction at 0xFFFF0, you could set the next breakpoint to break *0x7c00 to break when the bootloader is loaded by the BIOS.# The IP for remote debugging will be that of the host. = "TRUE" # Allows debugging from a different computer / VM instead of localhost.Note that this is a debug stub attached to the KERNEL, not a userspace program. Standard gdb commands work in this mode (e.g. Vmx| W110: Debug stub: VMware Workstation is listening for debug connection on port 8833. The actual port can always be located by looking at the latest "Debug stub" entry in the vmware.log file: Note that some versions of VMWare contain a bug: after you disconnect GDB from port 8832, VMWare will actually continue listening on port 88. Start a GDB session (using a copy of your kernel that includes debug information), then: If using these options, Workstation prints a message "VMware Workstation is listening for debug connection on port 8832." into the vmware.log file. These options are valid in Workstation 6.0+, and should be set in the virtual machine's. The new versions of VMware Player (from 3.0 up) are able to create new virtual machines. ![]() ![]() NOTE: VMware Player is totally free for use, and has smaller size than VMware Workstation.Useful feature: record-replay (though difficult to use), which might be helpful for reproducing race conditions. Useful feature: gdb-based guest debug stub support. Server and Player are free, which is a perk go for Server. Supports SMP, if you are writing a multiprocessor kernel. But in reality, go for something more modern. Marginally more useful: a buggy guest operating system traces useful error messages. ![]() Error codes are designed for reporting to VMware, and there are no developer-centric features. VMware's usefulness for hobbyists depends on the code's generation.
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