1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 2
3 config HAVE_ARCH_KGDB 3 config HAVE_ARCH_KGDB
4 bool 4 bool
5 5
6 # set if architecture has the its kgdb_arch_ha <<
7 # function to enable gdb stub to address XML p <<
8 config HAVE_ARCH_KGDB_QXFER_PKT <<
9 bool <<
10 <<
11 menuconfig KGDB 6 menuconfig KGDB
12 bool "KGDB: kernel debugger" 7 bool "KGDB: kernel debugger"
13 depends on HAVE_ARCH_KGDB 8 depends on HAVE_ARCH_KGDB
14 depends on DEBUG_KERNEL 9 depends on DEBUG_KERNEL
15 help 10 help
16 If you say Y here, it will be possib 11 If you say Y here, it will be possible to remotely debug the
17 kernel using gdb. It is recommended 12 kernel using gdb. It is recommended but not required, that
18 you also turn on the kernel config o 13 you also turn on the kernel config option
19 CONFIG_FRAME_POINTER to aid in produ 14 CONFIG_FRAME_POINTER to aid in producing more reliable stack
20 backtraces in the external debugger. 15 backtraces in the external debugger. Documentation of
21 kernel debugger is available at http 16 kernel debugger is available at http://kgdb.sourceforge.net
22 as well as in Documentation/dev-tool 17 as well as in Documentation/dev-tools/kgdb.rst. If
23 unsure, say N. 18 unsure, say N.
24 19
25 if KGDB 20 if KGDB
26 21
27 config KGDB_HONOUR_BLOCKLIST <<
28 bool "KGDB: use kprobe blocklist to pr <<
29 depends on HAVE_KPROBES <<
30 depends on MODULES <<
31 select KPROBES <<
32 default y <<
33 help <<
34 If set to Y the debug core will use <<
35 identify symbols where it is unsafe <<
36 In particular this disallows instrum <<
37 called during debug trap handling an <<
38 difficult to inadvertently provoke r <<
39 <<
40 If unsure, say Y. <<
41 <<
42 config KGDB_SERIAL_CONSOLE 22 config KGDB_SERIAL_CONSOLE
43 tristate "KGDB: use kgdb over the seri 23 tristate "KGDB: use kgdb over the serial console"
44 select CONSOLE_POLL 24 select CONSOLE_POLL
45 select MAGIC_SYSRQ 25 select MAGIC_SYSRQ
46 depends on TTY && VT !! 26 depends on TTY && HW_CONSOLE
47 default y 27 default y
48 help 28 help
49 Share a serial console with kgdb. Sy 29 Share a serial console with kgdb. Sysrq-g must be used
50 to break in initially. 30 to break in initially.
51 31
52 config KGDB_TESTS 32 config KGDB_TESTS
53 bool "KGDB: internal test suite" 33 bool "KGDB: internal test suite"
54 default n 34 default n
55 help 35 help
56 This is a kgdb I/O module specifical 36 This is a kgdb I/O module specifically designed to test
57 kgdb's internal functions. This kgd 37 kgdb's internal functions. This kgdb I/O module is
58 intended to for the development of n 38 intended to for the development of new kgdb stubs
59 as well as regression testing the kg 39 as well as regression testing the kgdb internals.
60 See the drivers/misc/kgdbts.c for th 40 See the drivers/misc/kgdbts.c for the details about
61 the tests. The most basic of this I 41 the tests. The most basic of this I/O module is to boot
62 a kernel boot arguments "kgdbwait kg 42 a kernel boot arguments "kgdbwait kgdbts=V1F100"
63 43
64 config KGDB_TESTS_ON_BOOT 44 config KGDB_TESTS_ON_BOOT
65 bool "KGDB: Run tests on boot" 45 bool "KGDB: Run tests on boot"
66 depends on KGDB_TESTS 46 depends on KGDB_TESTS
67 default n 47 default n
68 help 48 help
69 Run the kgdb tests on boot up automa 49 Run the kgdb tests on boot up automatically without the need
70 to pass in a kernel parameter 50 to pass in a kernel parameter
71 51
72 config KGDB_TESTS_BOOT_STRING 52 config KGDB_TESTS_BOOT_STRING
73 string "KGDB: which internal kgdb test 53 string "KGDB: which internal kgdb tests to run"
74 depends on KGDB_TESTS_ON_BOOT 54 depends on KGDB_TESTS_ON_BOOT
75 default "V1F100" 55 default "V1F100"
76 help 56 help
77 This is the command string to send t 57 This is the command string to send the kgdb test suite on
78 boot. See the drivers/misc/kgdbts.c 58 boot. See the drivers/misc/kgdbts.c for detailed
79 information about other strings you 59 information about other strings you could use beyond the
80 default of V1F100. 60 default of V1F100.
81 61
82 config KGDB_LOW_LEVEL_TRAP 62 config KGDB_LOW_LEVEL_TRAP
83 bool "KGDB: Allow debugging with traps 63 bool "KGDB: Allow debugging with traps in notifiers"
84 depends on X86 || MIPS 64 depends on X86 || MIPS
85 default n 65 default n
86 help 66 help
87 This will add an extra call back to k 67 This will add an extra call back to kgdb for the breakpoint
88 exception handler which will allow kg 68 exception handler which will allow kgdb to step through a
89 notify handler. 69 notify handler.
90 70
91 config KGDB_KDB 71 config KGDB_KDB
92 bool "KGDB_KDB: include kdb frontend f 72 bool "KGDB_KDB: include kdb frontend for kgdb"
93 default n 73 default n
94 help 74 help
95 KDB frontend for kernel 75 KDB frontend for kernel
96 76
97 config KDB_DEFAULT_ENABLE 77 config KDB_DEFAULT_ENABLE
98 hex "KDB: Select kdb command functions 78 hex "KDB: Select kdb command functions to be enabled by default"
99 depends on KGDB_KDB 79 depends on KGDB_KDB
100 default 0x1 80 default 0x1
101 help 81 help
102 Specifiers which kdb commands are en 82 Specifiers which kdb commands are enabled by default. This may
103 be set to 1 or 0 to enable all comma 83 be set to 1 or 0 to enable all commands or disable almost all
104 commands. 84 commands.
105 85
106 Alternatively the following bitmask 86 Alternatively the following bitmask applies:
107 87
108 0x0002 - allow arbitrary reads fro 88 0x0002 - allow arbitrary reads from memory and symbol lookup
109 0x0004 - allow arbitrary writes to 89 0x0004 - allow arbitrary writes to memory
110 0x0008 - allow current register st 90 0x0008 - allow current register state to be inspected
111 0x0010 - allow current register st 91 0x0010 - allow current register state to be modified
112 0x0020 - allow passive inspection 92 0x0020 - allow passive inspection (backtrace, process list, lsmod)
113 0x0040 - allow flow control manage 93 0x0040 - allow flow control management (breakpoint, single step)
114 0x0080 - enable signalling of proc 94 0x0080 - enable signalling of processes
115 0x0100 - allow machine to be reboo 95 0x0100 - allow machine to be rebooted
116 96
117 The config option merely sets the de 97 The config option merely sets the default at boot time. Both
118 issuing 'echo X > /sys/module/kdb/pa 98 issuing 'echo X > /sys/module/kdb/parameters/cmd_enable' or
119 setting with kdb.cmd_enable=X kernel 99 setting with kdb.cmd_enable=X kernel command line option will
120 override the default settings. 100 override the default settings.
121 101
122 config KDB_KEYBOARD 102 config KDB_KEYBOARD
123 bool "KGDB_KDB: keyboard as input devi 103 bool "KGDB_KDB: keyboard as input device"
124 depends on VT && KGDB_KDB && !PARISC !! 104 depends on VT && KGDB_KDB
125 depends on HAS_IOPORT <<
126 default n 105 default n
127 help 106 help
128 KDB can use a PS/2 type keyboard for 107 KDB can use a PS/2 type keyboard for an input device
129 108
130 config KDB_CONTINUE_CATASTROPHIC 109 config KDB_CONTINUE_CATASTROPHIC
131 int "KDB: continue after catastrophic 110 int "KDB: continue after catastrophic errors"
132 depends on KGDB_KDB 111 depends on KGDB_KDB
133 default "0" 112 default "0"
134 help 113 help
135 This integer controls the behaviour 114 This integer controls the behaviour of kdb when the kernel gets a
136 catastrophic error, i.e. for a panic 115 catastrophic error, i.e. for a panic or oops.
137 When KDB is active and a catastrophi 116 When KDB is active and a catastrophic error occurs, nothing extra
138 will happen until you type 'go'. 117 will happen until you type 'go'.
139 CONFIG_KDB_CONTINUE_CATASTROPHIC == 118 CONFIG_KDB_CONTINUE_CATASTROPHIC == 0 (default). The first time
140 you type 'go', you will be warned by 119 you type 'go', you will be warned by kdb. The secend time you type
141 'go', KDB tries to continue. No guar 120 'go', KDB tries to continue. No guarantees that the
142 kernel is still usable in this situa 121 kernel is still usable in this situation.
143 CONFIG_KDB_CONTINUE_CATASTROPHIC == 122 CONFIG_KDB_CONTINUE_CATASTROPHIC == 1. KDB tries to continue.
144 No guarantees that the kernel is sti 123 No guarantees that the kernel is still usable in this situation.
145 CONFIG_KDB_CONTINUE_CATASTROPHIC == 124 CONFIG_KDB_CONTINUE_CATASTROPHIC == 2. KDB forces a reboot.
146 If you are not sure, say 0. 125 If you are not sure, say 0.
147 <<
148 config ARCH_HAS_EARLY_DEBUG <<
149 bool <<
150 default n <<
151 help <<
152 If an architecture can definitely ha <<
153 when early_param's are parsed then i <<
154 Otherwise, if "kgdbwait" is passed o <<
155 won't actually be processed until db <<
156 call to kgdb_arch_late() is made. <<
157 <<
158 NOTE: Even if this isn't selected by <<
159 still try to register kgdb to handle <<
160 when early_param's are parsed, we ju <<
161 "kgdbwait" parameter until dbg_late_ <<
162 crash and try to drop into kgdb some <<
163 places you might or might not end up <<
164 depending on exactly how far along t <<
165 126
166 endif # KGDB 127 endif # KGDB
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