Where is mach kernel located

Of course, the more important issue is what value to choose for the debug flags. Table lists the debugging flags that are supported in OS X. Send kernel debugging printf output to console. Allow debugger to ARP and route allows debugging across routers and removes the need for a permanent ARP entry, but is a potential security hole —not available in all kernels. The last option is only available in Mac OS Macintosh computers have various watchdog timers designed to protect the system from certain types of failures.

There are two primary watchdog timers in common use: the power management watchdog timer not present on all systems and the system crash watchdog timer. Both watchdogs are part of the power management hardware. The first of these, the power management watchdog timer, is designed to restore the system to a known safe state in the event of unexpected communication loss between the power management hardware and the CPU.

This timer is only present in G4 and earlier desktops and laptops and in early G5 desktops. With the possible exception of a momentary loss of keyboard and mouse control, you probably won't notice that anything has happened and you should never even experience such a stall unless you are writing a device driver that disables interrupts for an extended period of time.

The problem occurs when the disruption in communication is caused by entering the debugger while the PMU chip is in one of these "unsafe" states.

If the chip is left in one of these "unsafe" states for too long, it will shut the computer down to prevent overheating or other problems. This problem can be significantly reduced by operating the PMU chip in polled mode. This prevents the watchdog timer from activating. You should only use this option when debugging, however, as it diminishes performance and a crashed system could overheat. The second type of watchdog timer is the system crash watchdog timer.

This is normally only enabled in OS X Server. If your target machine is running OS X Server, your system will automatically reboot within seconds after a crash to maximize server uptime. You can disable this automatic reboot on crash feature in the server administration tool. There are two basic debugging environments supported by OS X: ddb and gdb.

By contrast, gdb is supported using a debugging shim built into the kernel, which allows a remote computer on the same physical network to attach after a panic or sooner if you pass certain options to the kernel. For problems involving network extensions or low-level operating system bringups, ddb is the only way to do debugging. For other bugs, gdb is generally easier to use. For completeness, this chapter describes how to use both ddb and gdb to do basic debugging.

Since gdb itself is well documented and is commonly used for application programming, this chapter assumes at least a passing knowledge of the basics of using gdb and focuses on the areas where remote kernel gdb differs.

This section assumes that you have used gdb before, and does not attempt to explain basic usage. In standard OS X builds and in your builds unless you compile with ddb support , gdb support is built into the system but is turned off except in the case of a kernel panic. Of course, many software failures in the kernel do not result in a kernel panic but still cause aberrant behavior.

For these reasons, you can pass additional flags to the kernel to allow you to attach to a remote computer early in boot or after a nonmaskable interrupt NMI , or you can programmatically drop into the debugger in your code. You can cause the test computer the debug target to drop into the debugger in the following ways:. After you have decided what method to use for dropping into the debugger on the target, you must configure your debug host the computer that will actually be running gdb.

Your debug host should be running a version of OS X that is comparable to the version running on your target host. However, it should not be running a customized kernel, since a debug host crash would be problematic, to say the least. When using gdb , the best results can be obtained when the source code for the customized kernel is present on your debug host. This not only makes debugging easier by allowing you to see the lines of code when you stop execution, it also makes it easier to modify those lines of code.

Thus, the ideal situation is for your debug host to also be your build computer. This is not required, but it makes things easier. If you are debugging a kernel extension, it generally suffices to have the source for the kernel extension itself on your debug host.

However, if you need to see kernel-specific structures, having the kernel sources on your debug host may also be helpful. Once you have built a kernel using your debug host, you must then copy it to your target computer and reboot the target computer. At this point, if you are doing panic-only debugging, you should trigger the panic. Next, unless your kernel supports ARP while debugging and unless you enabled it with the appropriate debug flag , you need to add a permanent ARP entry for the target.

It will be unable to answer ARP requests while waiting for the debugger. The following example assumes that your target is target. Otherwise most of the gdb macros will fail. The correct kernel should be several times as large as a normal kernel. You must do the p proc0 command and source the. Of course, if you do not need any of the macros in. The macros are mostly of interest to people debugging aspects of Mach, though they also provide ways of obtaining information about currently loaded KEXTs.

If you are debugging a kernel module, you need to do some additional work to get debugging symbol information about the module. First, you need to know the load address for the module.

You can get this information by running kextstat kmodstat on systems running OS X v If you are already in the debugger, then assuming the target did not panic, you should be able to use the continue function in gdb to revive the target, get this information, then trigger another NMI to drop back into the debugger.

If the target is no longer functional, and if you have a fully symbol—laden kernel file on your debug host that matches the kernel on your debug target, you can use the showallkmods macro to obtain this information. I am trying to install VMware Fusion 3 and I am getting an error that says "The kernel could not be located. How do I get this file? Posted on Nov 15, PM.

Page content loaded. You may need to upgrade your software. VMware Fusion 3 is getting a bit old; Fusion 7 specifcally supports Yosemite.

Fusion 3 does not. From the vmware KB:. Nov 15, PM. You need to update to the latest version 6 I think? I guess I need to get my computer to boot from the USB. I understand. Posted February 17, Posted February 18, Posted February 19, Still waiting for a guide to how to build a Sierra installer. Posted February 20, Posted February 21, Posted February 22, Attached is a. Posted February 23, Posted February 24, Posted August 24, I ran into this error after first being unable to boot with the screen: boot0: GTP boot0: done which flashed for a fraction of a second and then my pc would reboot.

Any help is extremely appreciated. Open your own thread. Go to topic listing. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter jonacanar Start date Jun 3, Tags yosemite.

Status Not open for further replies. So, I can install and setup Yosemite, I ran multibeast and use the easybeast but when I restart my computer it loads chimera 4. I can load Yosemite just fine using the usb created with unibeast it uses clover.