Setpmem addr datasize val Set physical memory location of size Specify it, it will be the value the next address (as if you had You used, or to w(words) and x(hex) if none have been supplied. NOTE: these are *not* typical Intel nomenclature sizes,īut they are consistent with GDB convention. Xp /nuf addr Examine memory at physical address addr Manipulating Memory x /nuf addr Examine memory at linear address addr byte 0圆b /* Checksum (code dependent!, update it as needed) */Ĩ.13.4. Mov $0x8A00,%dx /* Return to Bochs Debugger Prompt (0x8AE0->0x8A00) */ Mov $0x8A00,%dx /* Enable addr range memory monitoring (0x8A80->0x8A00) */ Mov $0x8FA0,%ax /* Write end addr (low word) */ Mov $0x8A01,%dx /* Write end addr 0xB8FA0 (high word first) */ Mov $0x8000,%ax /* Write start addr (low word) */ Mov $0x8A01,%dx /* Write start addr 0xB8000 (high word first) */ * Monitor memory access on first page of text screen */ To the left by 16 the current value of the register and add the provided value to it.Įnable memory monitoring on first page of text screen (0xb8000-0xb8fa0):Īdd in bochrc file: optromimage1: file="asmio.rom", address=0xd0000 Access to port 0x8A01 (write-only)Īll accesses to this port must be done using words. Note: instruction tracing must be enabled to view the register tracingĭisable the I/O interface to the debugger and the memory monitoring functions.ģ.1.2. Output the value of all the registers for each instruction traced. If the debugger is enabled (via -enable-debugger), sending 0x8AE5 to port 0x8A00Īfter the device has been enabled will enable register tracing. If the debugger is enabled (via -enable-debugger), sending 0x8AE4 to port 0x8A00Īfter the device has been enabled will disable register tracing. If the debugger is enabled (via -enable-debugger), sending 0x8AE3 to port 0x8A00Īfter the device has been enabled will enable instruction tracing If the debugger is enabled (via -enable-debugger), sending 0x8AE2 to port 0x8A00Īfter the device has been enabled will disable instruction tracing If the debugger is enabled (via -enable-debugger), sending 0x8AE0 to port 0x8A00Īfter the device has been enabled will return the Bochs to the debugger prompt. Selects register 1: Memory monitoring range end address (exclusive)Įnable address range memory monitoring as indicated by register 0 and 1 and Selects register 0: Memory monitoring range start address (inclusive) Any I/O to the debug module before this command is sent Port 0x8A01 is used as data register for the memory monitoring.ģ.1.1. You can use it to enable the i/o interface,Ĭhange which data register is active, etc. It must be loaded with the 'plugin_ctrl' bochsrc option. configure line, see Bochsĭocumentation for all the information. Other optional fields may be added to the. This device was added by Dave Poirier Bochs with iodebug support This line disables the emulator reset on a Triple fault, enabling you toĭebug the code after a Triple fault occured (Very useful while When using the internal debugger, you may change this line in your Bochs configuration file: (bochs -rcīochs places an automatic breakpoint just before the BIOS loads, this can be automatically skipped by putting continue as the first command in the said file. Whenever you start bochs with the internal debugger. You can pass a file containing debug commands to automatically run When using the internal debugger, you may use the following command to switch CPUs: You should put the following line in your Bochs configuration file to have it listen to magic breakpoints: On real hardware this has no effect as it merely To trigger a breakpoint, you can insert xchg bx, bx (in GAS syntax, xchgw %bx, %bx)Īnywhere in the code and Bochs will trap into the debugger as soon as When you're using Bochs with the internal debugger, you can trigger the debugger via a facility called magic breakpoints. Some useful macros when Bochs is compiled with the I/O debug ports enabled ( port_e9_hack: enabled=1 if Bochs 2.4 or newer, configure -port-e9-hack if not): enable-usb-xhci \ below copy from I/O debugger macros modify /etc/fstab to mount your bochs source code select msys-base, mingw32-gcc-g , mingw32-base, mingw-developer-toolkitģ. If you want to play with long mode and SMP and debugger. The debugger enable one didn't support long mode. But the exe that support long mode didn't support debugger. However Bochs is good for fully debug in OS kernel development without expansive hardware tracer.īochs come with prebuilt execution file. It is slower than others like QEMU or VirtualBox which use hardware virtualization. Bochs is a pure software emulator for X86 CPU.
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