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-rw-r--r--microkernel/mach/gnumach.mdwn7
-rw-r--r--microkernel/mach/gnumach/debugging.mdwn53
2 files changed, 57 insertions, 3 deletions
diff --git a/microkernel/mach/gnumach.mdwn b/microkernel/mach/gnumach.mdwn
index cfdb1a99..16ed602a 100644
--- a/microkernel/mach/gnumach.mdwn
+++ b/microkernel/mach/gnumach.mdwn
@@ -10,15 +10,16 @@ GNU Mach is currently used by the GNU [[Hurd]].
GNU Mach remains compatible with Mach 3.0.
-The majority of GNU Mach's device drivers are from Linux 2.0. They were
-added using glue code, i.e., a Linux emulation layer in Mach.
+The majority of GNU Mach's [[device_driver]]s are from Linux 2.0. They were
+added using glue code, i.e., a Linux [[emulation]] layer in Mach.
GNU Mach runs on x86 machines. See the
[[hardware_compatibility_list|hardwarecompatibilitylist]] and information about
[[ports]] to other architectures.
-# Related Links
+# Development
* [[Building]]
+* [[Debugging]]
* [[RevivalProject]] - GNU Mach Projects
diff --git a/microkernel/mach/gnumach/debugging.mdwn b/microkernel/mach/gnumach/debugging.mdwn
new file mode 100644
index 00000000..7f4fc6ad
--- /dev/null
+++ b/microkernel/mach/gnumach/debugging.mdwn
@@ -0,0 +1,53 @@
+[[meta copyright="Copyright © 2007 Free Software Foundation, Inc."]]
+[[meta license="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled
+[[GNU_Free_Documentation_License|/fdl.txt]]."]]
+
+Mach has a built-in kernel debugger.
+[Manual](http://www.gnu.org/software/hurd/gnumach-doc/Kernel-Debugger.html).
+
+
+When you're [[running_a_system_in_QEMU|hurd/running/qemu]] you can directly
+[use GDB on the running
+kernel](http://fabrice.bellard.free.fr/qemu/qemu-doc.html#SEC36).
+
+
+Alternatively you can use an approach like this one: add the following code
+snippet to `device/ds_routines.c`'s `ds_device_open` function, right at the top
+of the function, and modify the code as needed.
+
+ void D (char *s)
+ {
+ switch (s[0] - '0')
+ {
+ case 0:
+ printf ("Hello from %s!\n", __FUNCTION__);
+ break;
+ case 1:
+ printf ("%s: Invoking task_collect_scan.\n", __FUNCTION__);
+ extern void task_collect_scan (void);
+ task_collect_scan ();
+ break;
+ default:
+ printf ("No idea what you want me to do.\n");
+ break;
+ }
+ }
+
+ if (name && name[0] == 'D')
+ D (name + 1);
+
+Then boot your system and do something like this:
+
+ # devprobe D0
+ Hello from D!
+ # devprobe D1
+ D: Invoking task_collect_scan.
+ # devprobe D2
+ No idea what you want me to do.
+
+This is especially useful if you need to manually trigger some stuff inside the
+running kernel, as with the *D1* example.