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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
dc7d5527 | 2 | |
e024cbd2 JE |
3 | config HAVE_ARCH_KGDB |
4 | bool | |
5 | ||
dc7d5527 | 6 | menuconfig KGDB |
dcc78711 | 7 | bool "KGDB: kernel debugger" |
dc7d5527 | 8 | depends on HAVE_ARCH_KGDB |
525c1f92 | 9 | depends on DEBUG_KERNEL |
dc7d5527 JW |
10 | help |
11 | If you say Y here, it will be possible to remotely debug the | |
5f5ddfb3 JW |
12 | kernel using gdb. It is recommended but not required, that |
13 | you also turn on the kernel config option | |
14 | CONFIG_FRAME_POINTER to aid in producing more reliable stack | |
15 | backtraces in the external debugger. Documentation of | |
16 | kernel debugger is available at http://kgdb.sourceforge.net | |
08c76a2f | 17 | as well as in Documentation/dev-tools/kgdb.rst. If |
5f5ddfb3 | 18 | unsure, say N. |
dc7d5527 | 19 | |
e024cbd2 | 20 | if KGDB |
dc7d5527 JW |
21 | |
22 | config KGDB_SERIAL_CONSOLE | |
23 | tristate "KGDB: use kgdb over the serial console" | |
dc7d5527 JW |
24 | select CONSOLE_POLL |
25 | select MAGIC_SYSRQ | |
c5d2cac0 | 26 | depends on TTY && HW_CONSOLE |
dc7d5527 JW |
27 | default y |
28 | help | |
29 | Share a serial console with kgdb. Sysrq-g must be used | |
30 | to break in initially. | |
e8d31c20 JW |
31 | |
32 | config KGDB_TESTS | |
33 | bool "KGDB: internal test suite" | |
e8d31c20 JW |
34 | default n |
35 | help | |
36 | This is a kgdb I/O module specifically designed to test | |
37 | kgdb's internal functions. This kgdb I/O module is | |
38 | intended to for the development of new kgdb stubs | |
39 | as well as regression testing the kgdb internals. | |
40 | See the drivers/misc/kgdbts.c for the details about | |
41 | the tests. The most basic of this I/O module is to boot | |
42 | a kernel boot arguments "kgdbwait kgdbts=V1F100" | |
974460c5 JW |
43 | |
44 | config KGDB_TESTS_ON_BOOT | |
45 | bool "KGDB: Run tests on boot" | |
46 | depends on KGDB_TESTS | |
47 | default n | |
48 | help | |
49 | Run the kgdb tests on boot up automatically without the need | |
50 | to pass in a kernel parameter | |
51 | ||
52 | config KGDB_TESTS_BOOT_STRING | |
53 | string "KGDB: which internal kgdb tests to run" | |
54 | depends on KGDB_TESTS_ON_BOOT | |
55 | default "V1F100" | |
56 | help | |
57 | This is the command string to send the kgdb test suite on | |
58 | boot. See the drivers/misc/kgdbts.c for detailed | |
59 | information about other strings you could use beyond the | |
60 | default of V1F100. | |
e024cbd2 | 61 | |
f503b5ae JW |
62 | config KGDB_LOW_LEVEL_TRAP |
63 | bool "KGDB: Allow debugging with traps in notifiers" | |
5dd11d5d | 64 | depends on X86 || MIPS |
f503b5ae JW |
65 | default n |
66 | help | |
67 | This will add an extra call back to kgdb for the breakpoint | |
278cee05 MI |
68 | exception handler which will allow kgdb to step through a |
69 | notify handler. | |
f503b5ae | 70 | |
dcc78711 JW |
71 | config KGDB_KDB |
72 | bool "KGDB_KDB: include kdb frontend for kgdb" | |
73 | default n | |
74 | help | |
75 | KDB frontend for kernel | |
76 | ||
b8017177 DT |
77 | config KDB_DEFAULT_ENABLE |
78 | hex "KDB: Select kdb command functions to be enabled by default" | |
79 | depends on KGDB_KDB | |
80 | default 0x1 | |
81 | help | |
82 | Specifiers which kdb commands are enabled by default. This may | |
83 | be set to 1 or 0 to enable all commands or disable almost all | |
84 | commands. | |
85 | ||
86 | Alternatively the following bitmask applies: | |
87 | ||
88 | 0x0002 - allow arbitrary reads from memory and symbol lookup | |
89 | 0x0004 - allow arbitrary writes to memory | |
90 | 0x0008 - allow current register state to be inspected | |
91 | 0x0010 - allow current register state to be modified | |
92 | 0x0020 - allow passive inspection (backtrace, process list, lsmod) | |
93 | 0x0040 - allow flow control management (breakpoint, single step) | |
94 | 0x0080 - enable signalling of processes | |
95 | 0x0100 - allow machine to be rebooted | |
96 | ||
97 | The config option merely sets the default at boot time. Both | |
98 | issuing 'echo X > /sys/module/kdb/parameters/cmd_enable' or | |
99 | setting with kdb.cmd_enable=X kernel command line option will | |
100 | override the default settings. | |
101 | ||
ada64e4c JW |
102 | config KDB_KEYBOARD |
103 | bool "KGDB_KDB: keyboard as input device" | |
104 | depends on VT && KGDB_KDB | |
105 | default n | |
106 | help | |
107 | KDB can use a PS/2 type keyboard for an input device | |
108 | ||
3b0eb71e RO |
109 | config KDB_CONTINUE_CATASTROPHIC |
110 | int "KDB: continue after catastrophic errors" | |
111 | depends on KGDB_KDB | |
112 | default "0" | |
113 | help | |
114 | This integer controls the behaviour of kdb when the kernel gets a | |
115 | catastrophic error, i.e. for a panic or oops. | |
116 | When KDB is active and a catastrophic error occurs, nothing extra | |
117 | will happen until you type 'go'. | |
118 | CONFIG_KDB_CONTINUE_CATASTROPHIC == 0 (default). The first time | |
119 | you type 'go', you will be warned by kdb. The secend time you type | |
120 | 'go', KDB tries to continue. No guarantees that the | |
121 | kernel is still usable in this situation. | |
122 | CONFIG_KDB_CONTINUE_CATASTROPHIC == 1. KDB tries to continue. | |
123 | No guarantees that the kernel is still usable in this situation. | |
124 | CONFIG_KDB_CONTINUE_CATASTROPHIC == 2. KDB forces a reboot. | |
125 | If you are not sure, say 0. | |
126 | ||
e024cbd2 | 127 | endif # KGDB |