kgdb patches for 5.15
Changes for kgdb/kdb this cycle are dominated by a change from Sumit that removes as small (256K) private heap from kdb. This is change I've hoped for ever since I discovered how few users of this heap remained in the kernel, so many thanks to Sumit for hunting these down. Other change is an incremental step towards SPDX headers. Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org> -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEELzVBU1D3lWq6cKzwfOMlXTn3iKEFAmE2OuUACgkQfOMlXTn3 iKEcTQ/7BiMPnSzPeh7srNIG1a7/ig8CUtu+qMsrU50BUvCBzhas3+fGbzlZHV4p GwCGTuRDWhVJjntpCkLYroSSF0h/AhN68pxqUx6EJUWEYMGuuMBuVtAdXYMSYbse MW+Jw6Tec2fWPyw6lyWd0vwOKLzhf/pC8axbmGESzgdmZrsWeA4XEeF5XRHsHyJf pL4GvBXN/mzH2TSQNQmSgda5VLnK3m6B66tlT17mywG8QTKwID8I4LXs9doNwqeW 6fkwJswAsCa+nO1GjMsRcA8HoUd7mtqLCYbjZzFVQdFJ6kF9eBKSPvgbaqr6oNvv t6VBfm908+fM4/4yEQSuwVPT32IPe7I/Bk+aUqnSpPiXU8v75u0lIfB929O/DS07 X+NjqpXN7v6mEpLAFgWhqPyzTODw40OhpOi1uf9jzPB/OSNm9y1zs21FJQSx6KGa AahMHrRoeZwlxNdD/2RBf9pQCSBWF5R1DyIye2iQX+e/jrvTXHMCK33tpcbcE9Cl bMVqnnJ4Pnmul6hAAf9WlJduIrACV1Oq1iQrtXWE3wdFZdQuvqKvwHUK/Zko+O0f cdW6neyW7Slo+8q2qXuEE0Bp+Ae61oZTrGIdfj29ZdXwp0+sBzcA5CFO7MKPJllV yEq41Bxc3cgJPcsFMZWSaHcEAI5fq1iBmquVdCA0/vYbP9dsO1U= =iMIF -----END PGP SIGNATURE----- Merge tag 'kgdb-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux Pull kgdb updates from Daniel Thompson: "Changes for kgdb/kdb this cycle are dominated by a change from Sumit that removes as small (256K) private heap from kdb. This is change I've hoped for ever since I discovered how few users of this heap remained in the kernel, so many thanks to Sumit for hunting these down. The other change is an incremental step towards SPDX headers" * tag 'kgdb-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux: kernel: debug: Convert to SPDX identifier kdb: Rename members of struct kdbtab_t kdb: Simplify kdb_defcmd macro logic kdb: Get rid of redundant kdb_register_flags() kdb: Rename struct defcmd_set to struct kdb_macro kdb: Get rid of custom debug heap allocator
This commit is contained in:
Linus Torvalds
commit
996fe06160
@ -13,6 +13,8 @@
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* Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
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*/
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#include <linux/list.h>
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/* Shifted versions of the command enable bits are be used if the command
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* has no arguments (see kdb_check_flags). This allows commands, such as
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* go, to have different permissions depending upon whether it is called
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@ -64,6 +66,17 @@ typedef enum {
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typedef int (*kdb_func_t)(int, const char **);
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/* The KDB shell command table */
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typedef struct _kdbtab {
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char *name; /* Command name */
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kdb_func_t func; /* Function to execute command */
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char *usage; /* Usage String for this command */
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char *help; /* Help message for this command */
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short minlen; /* Minimum legal # cmd chars required */
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kdb_cmdflags_t flags; /* Command behaviour flags */
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struct list_head list_node; /* Command list */
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} kdbtab_t;
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#ifdef CONFIG_KGDB_KDB
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#include <linux/init.h>
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#include <linux/sched.h>
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@ -193,19 +206,13 @@ static inline const char *kdb_walk_kallsyms(loff_t *pos)
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#endif /* ! CONFIG_KALLSYMS */
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/* Dynamic kdb shell command registration */
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extern int kdb_register(char *, kdb_func_t, char *, char *, short);
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extern int kdb_register_flags(char *, kdb_func_t, char *, char *,
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short, kdb_cmdflags_t);
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extern int kdb_unregister(char *);
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extern int kdb_register(kdbtab_t *cmd);
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extern void kdb_unregister(kdbtab_t *cmd);
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#else /* ! CONFIG_KGDB_KDB */
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static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
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static inline void kdb_init(int level) {}
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static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
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char *help, short minlen) { return 0; }
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static inline int kdb_register_flags(char *cmd, kdb_func_t func, char *usage,
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char *help, short minlen,
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kdb_cmdflags_t flags) { return 0; }
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static inline int kdb_unregister(char *cmd) { return 0; }
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static inline int kdb_register(kdbtab_t *cmd) { return 0; }
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static inline void kdb_unregister(kdbtab_t *cmd) {}
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#endif /* CONFIG_KGDB_KDB */
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enum {
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KDB_NOT_INITIALIZED,
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@ -1,3 +1,4 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Kernel Debug Core
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*
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@ -22,10 +23,6 @@
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*
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* Original KGDB stub: David Grothe <dave@gcom.com>,
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* Tigran Aivazian <tigran@sco.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#define pr_fmt(fmt) "KGDB: " fmt
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@ -1,3 +1,4 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Kernel Debug Core
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*
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@ -22,10 +23,6 @@
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*
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* Original KGDB stub: David Grothe <dave@gcom.com>,
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* Tigran Aivazian <tigran@sco.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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@ -523,51 +523,51 @@ static int kdb_ss(int argc, const char **argv)
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}
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static kdbtab_t bptab[] = {
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{ .cmd_name = "bp",
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.cmd_func = kdb_bp,
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.cmd_usage = "[<vaddr>]",
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.cmd_help = "Set/Display breakpoints",
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.cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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{ .name = "bp",
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.func = kdb_bp,
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.usage = "[<vaddr>]",
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.help = "Set/Display breakpoints",
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.flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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},
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{ .cmd_name = "bl",
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.cmd_func = kdb_bp,
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.cmd_usage = "[<vaddr>]",
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.cmd_help = "Display breakpoints",
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.cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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{ .name = "bl",
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.func = kdb_bp,
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.usage = "[<vaddr>]",
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.help = "Display breakpoints",
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.flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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},
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{ .cmd_name = "bc",
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.cmd_func = kdb_bc,
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.cmd_usage = "<bpnum>",
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.cmd_help = "Clear Breakpoint",
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.cmd_flags = KDB_ENABLE_FLOW_CTRL,
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{ .name = "bc",
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.func = kdb_bc,
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.usage = "<bpnum>",
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.help = "Clear Breakpoint",
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.flags = KDB_ENABLE_FLOW_CTRL,
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},
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{ .cmd_name = "be",
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.cmd_func = kdb_bc,
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.cmd_usage = "<bpnum>",
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.cmd_help = "Enable Breakpoint",
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.cmd_flags = KDB_ENABLE_FLOW_CTRL,
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{ .name = "be",
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.func = kdb_bc,
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.usage = "<bpnum>",
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.help = "Enable Breakpoint",
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.flags = KDB_ENABLE_FLOW_CTRL,
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},
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{ .cmd_name = "bd",
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.cmd_func = kdb_bc,
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.cmd_usage = "<bpnum>",
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.cmd_help = "Disable Breakpoint",
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.cmd_flags = KDB_ENABLE_FLOW_CTRL,
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{ .name = "bd",
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.func = kdb_bc,
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.usage = "<bpnum>",
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.help = "Disable Breakpoint",
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.flags = KDB_ENABLE_FLOW_CTRL,
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},
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{ .cmd_name = "ss",
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.cmd_func = kdb_ss,
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.cmd_usage = "",
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.cmd_help = "Single Step",
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.cmd_minlen = 1,
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.cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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{ .name = "ss",
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.func = kdb_ss,
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.usage = "",
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.help = "Single Step",
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.minlen = 1,
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.flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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},
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};
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static kdbtab_t bphcmd = {
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.cmd_name = "bph",
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.cmd_func = kdb_bp,
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.cmd_usage = "[<vaddr>]",
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.cmd_help = "[datar [length]|dataw [length]] Set hw brk",
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.cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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.name = "bph",
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.func = kdb_bp,
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.usage = "[<vaddr>]",
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.help = "[datar [length]|dataw [length]] Set hw brk",
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.flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
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};
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/* Initialize the breakpoint table and register breakpoint commands. */
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@ -140,7 +140,6 @@ int kdb_stub(struct kgdb_state *ks)
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*/
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kdb_common_deinit_state();
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KDB_STATE_CLEAR(PAGER);
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kdbnearsym_cleanup();
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if (error == KDB_CMD_KGDB) {
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if (KDB_STATE(DOING_KGDB))
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KDB_STATE_CLEAR(DOING_KGDB);
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@ -33,7 +33,6 @@
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#include <linux/kallsyms.h>
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#include <linux/kgdb.h>
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#include <linux/kdb.h>
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#include <linux/list.h>
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#include <linux/notifier.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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@ -654,16 +653,17 @@ static void kdb_cmderror(int diag)
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* Returns:
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* zero for success, a kdb diagnostic if error
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*/
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struct defcmd_set {
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int count;
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bool usable;
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char *name;
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char *usage;
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char *help;
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char **command;
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struct kdb_macro {
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kdbtab_t cmd; /* Macro command */
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struct list_head statements; /* Associated statement list */
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};
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static struct defcmd_set *defcmd_set;
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static int defcmd_set_count;
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struct kdb_macro_statement {
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char *statement; /* Statement text */
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struct list_head list_node; /* Statement list node */
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};
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static struct kdb_macro *kdb_macro;
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static bool defcmd_in_progress;
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/* Forward references */
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@ -671,53 +671,55 @@ static int kdb_exec_defcmd(int argc, const char **argv);
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static int kdb_defcmd2(const char *cmdstr, const char *argv0)
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{
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struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
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char **save_command = s->command;
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struct kdb_macro_statement *kms;
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if (!kdb_macro)
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return KDB_NOTIMP;
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if (strcmp(argv0, "endefcmd") == 0) {
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defcmd_in_progress = false;
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if (!s->count)
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s->usable = false;
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if (s->usable)
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/* macros are always safe because when executed each
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* internal command re-enters kdb_parse() and is
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* safety checked individually.
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*/
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kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
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s->help, 0,
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KDB_ENABLE_ALWAYS_SAFE);
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if (!list_empty(&kdb_macro->statements))
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kdb_register(&kdb_macro->cmd);
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return 0;
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}
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if (!s->usable)
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return KDB_NOTIMP;
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s->command = kcalloc(s->count + 1, sizeof(*(s->command)), GFP_KDB);
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if (!s->command) {
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kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
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kms = kmalloc(sizeof(*kms), GFP_KDB);
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if (!kms) {
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kdb_printf("Could not allocate new kdb macro command: %s\n",
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cmdstr);
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s->usable = false;
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return KDB_NOTIMP;
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}
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memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
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s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
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kfree(save_command);
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kms->statement = kdb_strdup(cmdstr, GFP_KDB);
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list_add_tail(&kms->list_node, &kdb_macro->statements);
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return 0;
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}
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static int kdb_defcmd(int argc, const char **argv)
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{
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struct defcmd_set *save_defcmd_set = defcmd_set, *s;
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kdbtab_t *mp;
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if (defcmd_in_progress) {
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kdb_printf("kdb: nested defcmd detected, assuming missing "
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"endefcmd\n");
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kdb_defcmd2("endefcmd", "endefcmd");
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}
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if (argc == 0) {
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int i;
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for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
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kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
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s->usage, s->help);
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for (i = 0; i < s->count; ++i)
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kdb_printf("%s", s->command[i]);
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kdb_printf("endefcmd\n");
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kdbtab_t *kp;
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struct kdb_macro *kmp;
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struct kdb_macro_statement *kms;
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list_for_each_entry(kp, &kdb_cmds_head, list_node) {
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if (kp->func == kdb_exec_defcmd) {
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kdb_printf("defcmd %s \"%s\" \"%s\"\n",
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kp->name, kp->usage, kp->help);
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kmp = container_of(kp, struct kdb_macro, cmd);
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list_for_each_entry(kms, &kmp->statements,
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list_node)
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kdb_printf("%s", kms->statement);
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kdb_printf("endefcmd\n");
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}
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}
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return 0;
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}
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@ -727,45 +729,43 @@ static int kdb_defcmd(int argc, const char **argv)
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kdb_printf("Command only available during kdb_init()\n");
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return KDB_NOTIMP;
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}
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defcmd_set = kmalloc_array(defcmd_set_count + 1, sizeof(*defcmd_set),
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GFP_KDB);
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if (!defcmd_set)
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kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
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if (!kdb_macro)
|
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goto fail_defcmd;
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memcpy(defcmd_set, save_defcmd_set,
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defcmd_set_count * sizeof(*defcmd_set));
|
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s = defcmd_set + defcmd_set_count;
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memset(s, 0, sizeof(*s));
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s->usable = true;
|
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s->name = kdb_strdup(argv[1], GFP_KDB);
|
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if (!s->name)
|
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|
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mp = &kdb_macro->cmd;
|
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mp->func = kdb_exec_defcmd;
|
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mp->minlen = 0;
|
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mp->flags = KDB_ENABLE_ALWAYS_SAFE;
|
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mp->name = kdb_strdup(argv[1], GFP_KDB);
|
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if (!mp->name)
|
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goto fail_name;
|
||||
s->usage = kdb_strdup(argv[2], GFP_KDB);
|
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if (!s->usage)
|
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mp->usage = kdb_strdup(argv[2], GFP_KDB);
|
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if (!mp->usage)
|
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goto fail_usage;
|
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s->help = kdb_strdup(argv[3], GFP_KDB);
|
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if (!s->help)
|
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mp->help = kdb_strdup(argv[3], GFP_KDB);
|
||||
if (!mp->help)
|
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goto fail_help;
|
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if (s->usage[0] == '"') {
|
||||
strcpy(s->usage, argv[2]+1);
|
||||
s->usage[strlen(s->usage)-1] = '\0';
|
||||
if (mp->usage[0] == '"') {
|
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strcpy(mp->usage, argv[2]+1);
|
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mp->usage[strlen(mp->usage)-1] = '\0';
|
||||
}
|
||||
if (s->help[0] == '"') {
|
||||
strcpy(s->help, argv[3]+1);
|
||||
s->help[strlen(s->help)-1] = '\0';
|
||||
if (mp->help[0] == '"') {
|
||||
strcpy(mp->help, argv[3]+1);
|
||||
mp->help[strlen(mp->help)-1] = '\0';
|
||||
}
|
||||
++defcmd_set_count;
|
||||
|
||||
INIT_LIST_HEAD(&kdb_macro->statements);
|
||||
defcmd_in_progress = true;
|
||||
kfree(save_defcmd_set);
|
||||
return 0;
|
||||
fail_help:
|
||||
kfree(s->usage);
|
||||
kfree(mp->usage);
|
||||
fail_usage:
|
||||
kfree(s->name);
|
||||
kfree(mp->name);
|
||||
fail_name:
|
||||
kfree(defcmd_set);
|
||||
kfree(kdb_macro);
|
||||
fail_defcmd:
|
||||
kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
|
||||
defcmd_set = save_defcmd_set;
|
||||
kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
|
||||
return KDB_NOTIMP;
|
||||
}
|
||||
|
||||
@ -780,25 +780,31 @@ fail_defcmd:
|
||||
*/
|
||||
static int kdb_exec_defcmd(int argc, const char **argv)
|
||||
{
|
||||
int i, ret;
|
||||
struct defcmd_set *s;
|
||||
int ret;
|
||||
kdbtab_t *kp;
|
||||
struct kdb_macro *kmp;
|
||||
struct kdb_macro_statement *kms;
|
||||
|
||||
if (argc != 0)
|
||||
return KDB_ARGCOUNT;
|
||||
for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
|
||||
if (strcmp(s->name, argv[0]) == 0)
|
||||
|
||||
list_for_each_entry(kp, &kdb_cmds_head, list_node) {
|
||||
if (strcmp(kp->name, argv[0]) == 0)
|
||||
break;
|
||||
}
|
||||
if (i == defcmd_set_count) {
|
||||
if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
|
||||
kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
|
||||
argv[0]);
|
||||
return KDB_NOTIMP;
|
||||
}
|
||||
for (i = 0; i < s->count; ++i) {
|
||||
/* Recursive use of kdb_parse, do not use argv after
|
||||
* this point */
|
||||
kmp = container_of(kp, struct kdb_macro, cmd);
|
||||
list_for_each_entry(kms, &kmp->statements, list_node) {
|
||||
/*
|
||||
* Recursive use of kdb_parse, do not use argv after this point.
|
||||
*/
|
||||
argv = NULL;
|
||||
kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
|
||||
ret = kdb_parse(s->command[i]);
|
||||
kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
|
||||
ret = kdb_parse(kms->statement);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
@ -1009,11 +1015,11 @@ int kdb_parse(const char *cmdstr)
|
||||
* If this command is allowed to be abbreviated,
|
||||
* check to see if this is it.
|
||||
*/
|
||||
if (tp->cmd_minlen && (strlen(argv[0]) <= tp->cmd_minlen) &&
|
||||
(strncmp(argv[0], tp->cmd_name, tp->cmd_minlen) == 0))
|
||||
if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
|
||||
(strncmp(argv[0], tp->name, tp->minlen) == 0))
|
||||
break;
|
||||
|
||||
if (strcmp(argv[0], tp->cmd_name) == 0)
|
||||
if (strcmp(argv[0], tp->name) == 0)
|
||||
break;
|
||||
}
|
||||
|
||||
@ -1024,8 +1030,7 @@ int kdb_parse(const char *cmdstr)
|
||||
*/
|
||||
if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
|
||||
list_for_each_entry(tp, &kdb_cmds_head, list_node) {
|
||||
if (strncmp(argv[0], tp->cmd_name,
|
||||
strlen(tp->cmd_name)) == 0)
|
||||
if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -1033,19 +1038,19 @@ int kdb_parse(const char *cmdstr)
|
||||
if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
|
||||
int result;
|
||||
|
||||
if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
|
||||
if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
|
||||
return KDB_NOPERM;
|
||||
|
||||
KDB_STATE_SET(CMD);
|
||||
result = (*tp->cmd_func)(argc-1, (const char **)argv);
|
||||
result = (*tp->func)(argc-1, (const char **)argv);
|
||||
if (result && ignore_errors && result > KDB_CMD_GO)
|
||||
result = 0;
|
||||
KDB_STATE_CLEAR(CMD);
|
||||
|
||||
if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
|
||||
if (tp->flags & KDB_REPEAT_WITH_ARGS)
|
||||
return result;
|
||||
|
||||
argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
|
||||
argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
|
||||
if (argv[argc])
|
||||
*(argv[argc]) = '\0';
|
||||
return result;
|
||||
@ -2412,12 +2417,12 @@ static int kdb_help(int argc, const char **argv)
|
||||
char *space = "";
|
||||
if (KDB_FLAG(CMD_INTERRUPT))
|
||||
return 0;
|
||||
if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
|
||||
if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
|
||||
continue;
|
||||
if (strlen(kt->cmd_usage) > 20)
|
||||
if (strlen(kt->usage) > 20)
|
||||
space = "\n ";
|
||||
kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
|
||||
kt->cmd_usage, space, kt->cmd_help);
|
||||
kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
|
||||
kt->usage, space, kt->help);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
@ -2613,56 +2618,32 @@ static int kdb_grep_help(int argc, const char **argv)
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* kdb_register_flags - This function is used to register a kernel
|
||||
* debugger command.
|
||||
* Inputs:
|
||||
* cmd Command name
|
||||
* func Function to execute the command
|
||||
* usage A simple usage string showing arguments
|
||||
* help A simple help string describing command
|
||||
* repeat Does the command auto repeat on enter?
|
||||
* Returns:
|
||||
* zero for success, one if a duplicate command.
|
||||
/**
|
||||
* kdb_register() - This function is used to register a kernel debugger
|
||||
* command.
|
||||
* @cmd: pointer to kdb command
|
||||
*
|
||||
* Note that it's the job of the caller to keep the memory for the cmd
|
||||
* allocated until unregister is called.
|
||||
*/
|
||||
int kdb_register_flags(char *cmd,
|
||||
kdb_func_t func,
|
||||
char *usage,
|
||||
char *help,
|
||||
short minlen,
|
||||
kdb_cmdflags_t flags)
|
||||
int kdb_register(kdbtab_t *cmd)
|
||||
{
|
||||
kdbtab_t *kp;
|
||||
|
||||
list_for_each_entry(kp, &kdb_cmds_head, list_node) {
|
||||
if (strcmp(kp->cmd_name, cmd) == 0) {
|
||||
kdb_printf("Duplicate kdb command registered: "
|
||||
"%s, func %px help %s\n", cmd, func, help);
|
||||
if (strcmp(kp->name, cmd->name) == 0) {
|
||||
kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
|
||||
cmd->name, cmd->func, cmd->help);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
kp = kmalloc(sizeof(*kp), GFP_KDB);
|
||||
if (!kp) {
|
||||
kdb_printf("Could not allocate new kdb_command table\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
kp->cmd_name = cmd;
|
||||
kp->cmd_func = func;
|
||||
kp->cmd_usage = usage;
|
||||
kp->cmd_help = help;
|
||||
kp->cmd_minlen = minlen;
|
||||
kp->cmd_flags = flags;
|
||||
kp->is_dynamic = true;
|
||||
|
||||
list_add_tail(&kp->list_node, &kdb_cmds_head);
|
||||
|
||||
list_add_tail(&cmd->list_node, &kdb_cmds_head);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kdb_register_flags);
|
||||
EXPORT_SYMBOL_GPL(kdb_register);
|
||||
|
||||
/*
|
||||
/**
|
||||
* kdb_register_table() - This function is used to register a kdb command
|
||||
* table.
|
||||
* @kp: pointer to kdb command table
|
||||
@ -2676,266 +2657,231 @@ void kdb_register_table(kdbtab_t *kp, size_t len)
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* kdb_register - Compatibility register function for commands that do
|
||||
* not need to specify a repeat state. Equivalent to
|
||||
* kdb_register_flags with flags set to 0.
|
||||
* Inputs:
|
||||
* cmd Command name
|
||||
* func Function to execute the command
|
||||
* usage A simple usage string showing arguments
|
||||
* help A simple help string describing command
|
||||
* Returns:
|
||||
* zero for success, one if a duplicate command.
|
||||
/**
|
||||
* kdb_unregister() - This function is used to unregister a kernel debugger
|
||||
* command. It is generally called when a module which
|
||||
* implements kdb command is unloaded.
|
||||
* @cmd: pointer to kdb command
|
||||
*/
|
||||
int kdb_register(char *cmd,
|
||||
kdb_func_t func,
|
||||
char *usage,
|
||||
char *help,
|
||||
short minlen)
|
||||
void kdb_unregister(kdbtab_t *cmd)
|
||||
{
|
||||
return kdb_register_flags(cmd, func, usage, help, minlen, 0);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kdb_register);
|
||||
|
||||
/*
|
||||
* kdb_unregister - This function is used to unregister a kernel
|
||||
* debugger command. It is generally called when a module which
|
||||
* implements kdb commands is unloaded.
|
||||
* Inputs:
|
||||
* cmd Command name
|
||||
* Returns:
|
||||
* zero for success, one command not registered.
|
||||
*/
|
||||
int kdb_unregister(char *cmd)
|
||||
{
|
||||
kdbtab_t *kp;
|
||||
|
||||
/*
|
||||
* find the command.
|
||||
*/
|
||||
list_for_each_entry(kp, &kdb_cmds_head, list_node) {
|
||||
if (strcmp(kp->cmd_name, cmd) == 0) {
|
||||
list_del(&kp->list_node);
|
||||
if (kp->is_dynamic)
|
||||
kfree(kp);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Couldn't find it. */
|
||||
return 1;
|
||||
list_del(&cmd->list_node);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(kdb_unregister);
|
||||
|
||||
static kdbtab_t maintab[] = {
|
||||
{ .cmd_name = "md",
|
||||
.cmd_func = kdb_md,
|
||||
.cmd_usage = "<vaddr>",
|
||||
.cmd_help = "Display Memory Contents, also mdWcN, e.g. md8c1",
|
||||
.cmd_minlen = 1,
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
{ .name = "md",
|
||||
.func = kdb_md,
|
||||
.usage = "<vaddr>",
|
||||
.help = "Display Memory Contents, also mdWcN, e.g. md8c1",
|
||||
.minlen = 1,
|
||||
.flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "mdr",
|
||||
.cmd_func = kdb_md,
|
||||
.cmd_usage = "<vaddr> <bytes>",
|
||||
.cmd_help = "Display Raw Memory",
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
{ .name = "mdr",
|
||||
.func = kdb_md,
|
||||
.usage = "<vaddr> <bytes>",
|
||||
.help = "Display Raw Memory",
|
||||
.flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "mdp",
|
||||
.cmd_func = kdb_md,
|
||||
.cmd_usage = "<paddr> <bytes>",
|
||||
.cmd_help = "Display Physical Memory",
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
{ .name = "mdp",
|
||||
.func = kdb_md,
|
||||
.usage = "<paddr> <bytes>",
|
||||
.help = "Display Physical Memory",
|
||||
.flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "mds",
|
||||
.cmd_func = kdb_md,
|
||||
.cmd_usage = "<vaddr>",
|
||||
.cmd_help = "Display Memory Symbolically",
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
{ .name = "mds",
|
||||
.func = kdb_md,
|
||||
.usage = "<vaddr>",
|
||||
.help = "Display Memory Symbolically",
|
||||
.flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "mm",
|
||||
.cmd_func = kdb_mm,
|
||||
.cmd_usage = "<vaddr> <contents>",
|
||||
.cmd_help = "Modify Memory Contents",
|
||||
.cmd_flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
|
||||
{ .name = "mm",
|
||||
.func = kdb_mm,
|
||||
.usage = "<vaddr> <contents>",
|
||||
.help = "Modify Memory Contents",
|
||||
.flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "go",
|
||||
.cmd_func = kdb_go,
|
||||
.cmd_usage = "[<vaddr>]",
|
||||
.cmd_help = "Continue Execution",
|
||||
.cmd_minlen = 1,
|
||||
.cmd_flags = KDB_ENABLE_REG_WRITE |
|
||||
{ .name = "go",
|
||||
.func = kdb_go,
|
||||
.usage = "[<vaddr>]",
|
||||
.help = "Continue Execution",
|
||||
.minlen = 1,
|
||||
.flags = KDB_ENABLE_REG_WRITE |
|
||||
KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "rd",
|
||||
.cmd_func = kdb_rd,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Display Registers",
|
||||
.cmd_flags = KDB_ENABLE_REG_READ,
|
||||
{ .name = "rd",
|
||||
.func = kdb_rd,
|
||||
.usage = "",
|
||||
.help = "Display Registers",
|
||||
.flags = KDB_ENABLE_REG_READ,
|
||||
},
|
||||
{ .cmd_name = "rm",
|
||||
.cmd_func = kdb_rm,
|
||||
.cmd_usage = "<reg> <contents>",
|
||||
.cmd_help = "Modify Registers",
|
||||
.cmd_flags = KDB_ENABLE_REG_WRITE,
|
||||
{ .name = "rm",
|
||||
.func = kdb_rm,
|
||||
.usage = "<reg> <contents>",
|
||||
.help = "Modify Registers",
|
||||
.flags = KDB_ENABLE_REG_WRITE,
|
||||
},
|
||||
{ .cmd_name = "ef",
|
||||
.cmd_func = kdb_ef,
|
||||
.cmd_usage = "<vaddr>",
|
||||
.cmd_help = "Display exception frame",
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ,
|
||||
{ .name = "ef",
|
||||
.func = kdb_ef,
|
||||
.usage = "<vaddr>",
|
||||
.help = "Display exception frame",
|
||||
.flags = KDB_ENABLE_MEM_READ,
|
||||
},
|
||||
{ .cmd_name = "bt",
|
||||
.cmd_func = kdb_bt,
|
||||
.cmd_usage = "[<vaddr>]",
|
||||
.cmd_help = "Stack traceback",
|
||||
.cmd_minlen = 1,
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
|
||||
{ .name = "bt",
|
||||
.func = kdb_bt,
|
||||
.usage = "[<vaddr>]",
|
||||
.help = "Stack traceback",
|
||||
.minlen = 1,
|
||||
.flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "btp",
|
||||
.cmd_func = kdb_bt,
|
||||
.cmd_usage = "<pid>",
|
||||
.cmd_help = "Display stack for process <pid>",
|
||||
.cmd_flags = KDB_ENABLE_INSPECT,
|
||||
{ .name = "btp",
|
||||
.func = kdb_bt,
|
||||
.usage = "<pid>",
|
||||
.help = "Display stack for process <pid>",
|
||||
.flags = KDB_ENABLE_INSPECT,
|
||||
},
|
||||
{ .cmd_name = "bta",
|
||||
.cmd_func = kdb_bt,
|
||||
.cmd_usage = "[D|R|S|T|C|Z|E|U|I|M|A]",
|
||||
.cmd_help = "Backtrace all processes matching state flag",
|
||||
.cmd_flags = KDB_ENABLE_INSPECT,
|
||||
{ .name = "bta",
|
||||
.func = kdb_bt,
|
||||
.usage = "[D|R|S|T|C|Z|E|U|I|M|A]",
|
||||
.help = "Backtrace all processes matching state flag",
|
||||
.flags = KDB_ENABLE_INSPECT,
|
||||
},
|
||||
{ .cmd_name = "btc",
|
||||
.cmd_func = kdb_bt,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Backtrace current process on each cpu",
|
||||
.cmd_flags = KDB_ENABLE_INSPECT,
|
||||
{ .name = "btc",
|
||||
.func = kdb_bt,
|
||||
.usage = "",
|
||||
.help = "Backtrace current process on each cpu",
|
||||
.flags = KDB_ENABLE_INSPECT,
|
||||
},
|
||||
{ .cmd_name = "btt",
|
||||
.cmd_func = kdb_bt,
|
||||
.cmd_usage = "<vaddr>",
|
||||
.cmd_help = "Backtrace process given its struct task address",
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
|
||||
{ .name = "btt",
|
||||
.func = kdb_bt,
|
||||
.usage = "<vaddr>",
|
||||
.help = "Backtrace process given its struct task address",
|
||||
.flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "env",
|
||||
.cmd_func = kdb_env,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Show environment variables",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "env",
|
||||
.func = kdb_env,
|
||||
.usage = "",
|
||||
.help = "Show environment variables",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
{ .cmd_name = "set",
|
||||
.cmd_func = kdb_set,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Set environment variables",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "set",
|
||||
.func = kdb_set,
|
||||
.usage = "",
|
||||
.help = "Set environment variables",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
{ .cmd_name = "help",
|
||||
.cmd_func = kdb_help,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Display Help Message",
|
||||
.cmd_minlen = 1,
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "help",
|
||||
.func = kdb_help,
|
||||
.usage = "",
|
||||
.help = "Display Help Message",
|
||||
.minlen = 1,
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
{ .cmd_name = "?",
|
||||
.cmd_func = kdb_help,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Display Help Message",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "?",
|
||||
.func = kdb_help,
|
||||
.usage = "",
|
||||
.help = "Display Help Message",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
{ .cmd_name = "cpu",
|
||||
.cmd_func = kdb_cpu,
|
||||
.cmd_usage = "<cpunum>",
|
||||
.cmd_help = "Switch to new cpu",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
|
||||
{ .name = "cpu",
|
||||
.func = kdb_cpu,
|
||||
.usage = "<cpunum>",
|
||||
.help = "Switch to new cpu",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
|
||||
},
|
||||
{ .cmd_name = "kgdb",
|
||||
.cmd_func = kdb_kgdb,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Enter kgdb mode",
|
||||
.cmd_flags = 0,
|
||||
{ .name = "kgdb",
|
||||
.func = kdb_kgdb,
|
||||
.usage = "",
|
||||
.help = "Enter kgdb mode",
|
||||
.flags = 0,
|
||||
},
|
||||
{ .cmd_name = "ps",
|
||||
.cmd_func = kdb_ps,
|
||||
.cmd_usage = "[<flags>|A]",
|
||||
.cmd_help = "Display active task list",
|
||||
.cmd_flags = KDB_ENABLE_INSPECT,
|
||||
{ .name = "ps",
|
||||
.func = kdb_ps,
|
||||
.usage = "[<flags>|A]",
|
||||
.help = "Display active task list",
|
||||
.flags = KDB_ENABLE_INSPECT,
|
||||
},
|
||||
{ .cmd_name = "pid",
|
||||
.cmd_func = kdb_pid,
|
||||
.cmd_usage = "<pidnum>",
|
||||
.cmd_help = "Switch to another task",
|
||||
.cmd_flags = KDB_ENABLE_INSPECT,
|
||||
{ .name = "pid",
|
||||
.func = kdb_pid,
|
||||
.usage = "<pidnum>",
|
||||
.help = "Switch to another task",
|
||||
.flags = KDB_ENABLE_INSPECT,
|
||||
},
|
||||
{ .cmd_name = "reboot",
|
||||
.cmd_func = kdb_reboot,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Reboot the machine immediately",
|
||||
.cmd_flags = KDB_ENABLE_REBOOT,
|
||||
{ .name = "reboot",
|
||||
.func = kdb_reboot,
|
||||
.usage = "",
|
||||
.help = "Reboot the machine immediately",
|
||||
.flags = KDB_ENABLE_REBOOT,
|
||||
},
|
||||
#if defined(CONFIG_MODULES)
|
||||
{ .cmd_name = "lsmod",
|
||||
.cmd_func = kdb_lsmod,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "List loaded kernel modules",
|
||||
.cmd_flags = KDB_ENABLE_INSPECT,
|
||||
{ .name = "lsmod",
|
||||
.func = kdb_lsmod,
|
||||
.usage = "",
|
||||
.help = "List loaded kernel modules",
|
||||
.flags = KDB_ENABLE_INSPECT,
|
||||
},
|
||||
#endif
|
||||
#if defined(CONFIG_MAGIC_SYSRQ)
|
||||
{ .cmd_name = "sr",
|
||||
.cmd_func = kdb_sr,
|
||||
.cmd_usage = "<key>",
|
||||
.cmd_help = "Magic SysRq key",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "sr",
|
||||
.func = kdb_sr,
|
||||
.usage = "<key>",
|
||||
.help = "Magic SysRq key",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
#endif
|
||||
#if defined(CONFIG_PRINTK)
|
||||
{ .cmd_name = "dmesg",
|
||||
.cmd_func = kdb_dmesg,
|
||||
.cmd_usage = "[lines]",
|
||||
.cmd_help = "Display syslog buffer",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "dmesg",
|
||||
.func = kdb_dmesg,
|
||||
.usage = "[lines]",
|
||||
.help = "Display syslog buffer",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
#endif
|
||||
{ .cmd_name = "defcmd",
|
||||
.cmd_func = kdb_defcmd,
|
||||
.cmd_usage = "name \"usage\" \"help\"",
|
||||
.cmd_help = "Define a set of commands, down to endefcmd",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "defcmd",
|
||||
.func = kdb_defcmd,
|
||||
.usage = "name \"usage\" \"help\"",
|
||||
.help = "Define a set of commands, down to endefcmd",
|
||||
/*
|
||||
* Macros are always safe because when executed each
|
||||
* internal command re-enters kdb_parse() and is safety
|
||||
* checked individually.
|
||||
*/
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
{ .cmd_name = "kill",
|
||||
.cmd_func = kdb_kill,
|
||||
.cmd_usage = "<-signal> <pid>",
|
||||
.cmd_help = "Send a signal to a process",
|
||||
.cmd_flags = KDB_ENABLE_SIGNAL,
|
||||
{ .name = "kill",
|
||||
.func = kdb_kill,
|
||||
.usage = "<-signal> <pid>",
|
||||
.help = "Send a signal to a process",
|
||||
.flags = KDB_ENABLE_SIGNAL,
|
||||
},
|
||||
{ .cmd_name = "summary",
|
||||
.cmd_func = kdb_summary,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Summarize the system",
|
||||
.cmd_minlen = 4,
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "summary",
|
||||
.func = kdb_summary,
|
||||
.usage = "",
|
||||
.help = "Summarize the system",
|
||||
.minlen = 4,
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
{ .cmd_name = "per_cpu",
|
||||
.cmd_func = kdb_per_cpu,
|
||||
.cmd_usage = "<sym> [<bytes>] [<cpu>]",
|
||||
.cmd_help = "Display per_cpu variables",
|
||||
.cmd_minlen = 3,
|
||||
.cmd_flags = KDB_ENABLE_MEM_READ,
|
||||
{ .name = "per_cpu",
|
||||
.func = kdb_per_cpu,
|
||||
.usage = "<sym> [<bytes>] [<cpu>]",
|
||||
.help = "Display per_cpu variables",
|
||||
.minlen = 3,
|
||||
.flags = KDB_ENABLE_MEM_READ,
|
||||
},
|
||||
{ .cmd_name = "grephelp",
|
||||
.cmd_func = kdb_grep_help,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Display help on | grep",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
{ .name = "grephelp",
|
||||
.func = kdb_grep_help,
|
||||
.usage = "",
|
||||
.help = "Display help on | grep",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
},
|
||||
};
|
||||
|
||||
static kdbtab_t nmicmd = {
|
||||
.cmd_name = "disable_nmi",
|
||||
.cmd_func = kdb_disable_nmi,
|
||||
.cmd_usage = "",
|
||||
.cmd_help = "Disable NMI entry to KDB",
|
||||
.cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
.name = "disable_nmi",
|
||||
.func = kdb_disable_nmi,
|
||||
.usage = "",
|
||||
.help = "Disable NMI entry to KDB",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
};
|
||||
|
||||
/* Initialize the kdb command table. */
|
||||
|
||||
@ -109,7 +109,6 @@ extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
|
||||
long *, char **);
|
||||
extern int kdbgetsymval(const char *, kdb_symtab_t *);
|
||||
extern int kdbnearsym(unsigned long, kdb_symtab_t *);
|
||||
extern void kdbnearsym_cleanup(void);
|
||||
extern char *kdb_strdup(const char *str, gfp_t type);
|
||||
extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
|
||||
|
||||
@ -165,19 +164,6 @@ typedef struct _kdb_bp {
|
||||
#ifdef CONFIG_KGDB_KDB
|
||||
extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
|
||||
|
||||
/* The KDB shell command table */
|
||||
typedef struct _kdbtab {
|
||||
char *cmd_name; /* Command name */
|
||||
kdb_func_t cmd_func; /* Function to execute command */
|
||||
char *cmd_usage; /* Usage String for this command */
|
||||
char *cmd_help; /* Help message for this command */
|
||||
short cmd_minlen; /* Minimum legal # command
|
||||
* chars required */
|
||||
kdb_cmdflags_t cmd_flags; /* Command behaviour flags */
|
||||
struct list_head list_node; /* Command list */
|
||||
bool is_dynamic; /* Command table allocation type */
|
||||
} kdbtab_t;
|
||||
|
||||
extern void kdb_register_table(kdbtab_t *kp, size_t len);
|
||||
extern int kdb_bt(int, const char **); /* KDB display back trace */
|
||||
|
||||
@ -233,10 +219,6 @@ extern struct task_struct *kdb_curr_task(int);
|
||||
|
||||
#define GFP_KDB (in_dbg_master() ? GFP_ATOMIC : GFP_KERNEL)
|
||||
|
||||
extern void *debug_kmalloc(size_t size, gfp_t flags);
|
||||
extern void debug_kfree(void *);
|
||||
extern void debug_kusage(void);
|
||||
|
||||
extern struct task_struct *kdb_current_task;
|
||||
extern struct pt_regs *kdb_current_regs;
|
||||
|
||||
|
||||
@ -51,48 +51,48 @@ int kdbgetsymval(const char *symname, kdb_symtab_t *symtab)
|
||||
}
|
||||
EXPORT_SYMBOL(kdbgetsymval);
|
||||
|
||||
static char *kdb_name_table[100]; /* arbitrary size */
|
||||
|
||||
/*
|
||||
* kdbnearsym - Return the name of the symbol with the nearest address
|
||||
* less than 'addr'.
|
||||
/**
|
||||
* kdbnearsym() - Return the name of the symbol with the nearest address
|
||||
* less than @addr.
|
||||
* @addr: Address to check for near symbol
|
||||
* @symtab: Structure to receive results
|
||||
*
|
||||
* Parameters:
|
||||
* addr Address to check for symbol near
|
||||
* symtab Structure to receive results
|
||||
* Returns:
|
||||
* 0 No sections contain this address, symtab zero filled
|
||||
* 1 Address mapped to module/symbol/section, data in symtab
|
||||
* Remarks:
|
||||
* 2.6 kallsyms has a "feature" where it unpacks the name into a
|
||||
* string. If that string is reused before the caller expects it
|
||||
* then the caller sees its string change without warning. To
|
||||
* avoid cluttering up the main kdb code with lots of kdb_strdup,
|
||||
* tests and kfree calls, kdbnearsym maintains an LRU list of the
|
||||
* last few unique strings. The list is sized large enough to
|
||||
* hold active strings, no kdb caller of kdbnearsym makes more
|
||||
* than ~20 later calls before using a saved value.
|
||||
* WARNING: This function may return a pointer to a single statically
|
||||
* allocated buffer (namebuf). kdb's unusual calling context (single
|
||||
* threaded, all other CPUs halted) provides us sufficient locking for
|
||||
* this to be safe. The only constraint imposed by the static buffer is
|
||||
* that the caller must consume any previous reply prior to another call
|
||||
* to lookup a new symbol.
|
||||
*
|
||||
* Note that, strictly speaking, some architectures may re-enter the kdb
|
||||
* trap if the system turns out to be very badly damaged and this breaks
|
||||
* the single-threaded assumption above. In these circumstances successful
|
||||
* continuation and exit from the inner trap is unlikely to work and any
|
||||
* user attempting this receives a prominent warning before being allowed
|
||||
* to progress. In these circumstances we remain memory safe because
|
||||
* namebuf[KSYM_NAME_LEN-1] will never change from '\0' although we do
|
||||
* tolerate the possibility of garbled symbol display from the outer kdb
|
||||
* trap.
|
||||
*
|
||||
* Return:
|
||||
* * 0 - No sections contain this address, symtab zero filled
|
||||
* * 1 - Address mapped to module/symbol/section, data in symtab
|
||||
*/
|
||||
int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
|
||||
{
|
||||
int ret = 0;
|
||||
unsigned long symbolsize = 0;
|
||||
unsigned long offset = 0;
|
||||
#define knt1_size 128 /* must be >= kallsyms table size */
|
||||
char *knt1 = NULL;
|
||||
static char namebuf[KSYM_NAME_LEN];
|
||||
|
||||
kdb_dbg_printf(AR, "addr=0x%lx, symtab=%px\n", addr, symtab);
|
||||
memset(symtab, 0, sizeof(*symtab));
|
||||
|
||||
if (addr < 4096)
|
||||
goto out;
|
||||
knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC);
|
||||
if (!knt1) {
|
||||
kdb_func_printf("addr=0x%lx cannot kmalloc knt1\n", addr);
|
||||
goto out;
|
||||
}
|
||||
|
||||
symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset,
|
||||
(char **)(&symtab->mod_name), knt1);
|
||||
(char **)(&symtab->mod_name), namebuf);
|
||||
if (offset > 8*1024*1024) {
|
||||
symtab->sym_name = NULL;
|
||||
addr = offset = symbolsize = 0;
|
||||
@ -101,63 +101,14 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
|
||||
symtab->sym_end = symtab->sym_start + symbolsize;
|
||||
ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
|
||||
|
||||
if (ret) {
|
||||
int i;
|
||||
/* Another 2.6 kallsyms "feature". Sometimes the sym_name is
|
||||
* set but the buffer passed into kallsyms_lookup is not used,
|
||||
* so it contains garbage. The caller has to work out which
|
||||
* buffer needs to be saved.
|
||||
*
|
||||
* What was Rusty smoking when he wrote that code?
|
||||
*/
|
||||
if (symtab->sym_name != knt1) {
|
||||
strncpy(knt1, symtab->sym_name, knt1_size);
|
||||
knt1[knt1_size-1] = '\0';
|
||||
}
|
||||
for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
|
||||
if (kdb_name_table[i] &&
|
||||
strcmp(kdb_name_table[i], knt1) == 0)
|
||||
break;
|
||||
}
|
||||
if (i >= ARRAY_SIZE(kdb_name_table)) {
|
||||
debug_kfree(kdb_name_table[0]);
|
||||
memmove(kdb_name_table, kdb_name_table+1,
|
||||
sizeof(kdb_name_table[0]) *
|
||||
(ARRAY_SIZE(kdb_name_table)-1));
|
||||
} else {
|
||||
debug_kfree(knt1);
|
||||
knt1 = kdb_name_table[i];
|
||||
memmove(kdb_name_table+i, kdb_name_table+i+1,
|
||||
sizeof(kdb_name_table[0]) *
|
||||
(ARRAY_SIZE(kdb_name_table)-i-1));
|
||||
}
|
||||
i = ARRAY_SIZE(kdb_name_table) - 1;
|
||||
kdb_name_table[i] = knt1;
|
||||
symtab->sym_name = kdb_name_table[i];
|
||||
knt1 = NULL;
|
||||
}
|
||||
|
||||
if (symtab->mod_name == NULL)
|
||||
symtab->mod_name = "kernel";
|
||||
kdb_dbg_printf(AR, "returns %d symtab->sym_start=0x%lx, symtab->mod_name=%px, symtab->sym_name=%px (%s)\n",
|
||||
ret, symtab->sym_start, symtab->mod_name, symtab->sym_name, symtab->sym_name);
|
||||
|
||||
out:
|
||||
debug_kfree(knt1);
|
||||
return ret;
|
||||
}
|
||||
|
||||
void kdbnearsym_cleanup(void)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
|
||||
if (kdb_name_table[i]) {
|
||||
debug_kfree(kdb_name_table[i]);
|
||||
kdb_name_table[i] = NULL;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1];
|
||||
|
||||
/*
|
||||
@ -655,230 +606,6 @@ unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
|
||||
return (mask & kdb_task_state_string(state)) != 0;
|
||||
}
|
||||
|
||||
/* Last ditch allocator for debugging, so we can still debug even when
|
||||
* the GFP_ATOMIC pool has been exhausted. The algorithms are tuned
|
||||
* for space usage, not for speed. One smallish memory pool, the free
|
||||
* chain is always in ascending address order to allow coalescing,
|
||||
* allocations are done in brute force best fit.
|
||||
*/
|
||||
|
||||
struct debug_alloc_header {
|
||||
u32 next; /* offset of next header from start of pool */
|
||||
u32 size;
|
||||
void *caller;
|
||||
};
|
||||
|
||||
/* The memory returned by this allocator must be aligned, which means
|
||||
* so must the header size. Do not assume that sizeof(struct
|
||||
* debug_alloc_header) is a multiple of the alignment, explicitly
|
||||
* calculate the overhead of this header, including the alignment.
|
||||
* The rest of this code must not use sizeof() on any header or
|
||||
* pointer to a header.
|
||||
*/
|
||||
#define dah_align 8
|
||||
#define dah_overhead ALIGN(sizeof(struct debug_alloc_header), dah_align)
|
||||
|
||||
static u64 debug_alloc_pool_aligned[256*1024/dah_align]; /* 256K pool */
|
||||
static char *debug_alloc_pool = (char *)debug_alloc_pool_aligned;
|
||||
static u32 dah_first, dah_first_call = 1, dah_used, dah_used_max;
|
||||
|
||||
/* Locking is awkward. The debug code is called from all contexts,
|
||||
* including non maskable interrupts. A normal spinlock is not safe
|
||||
* in NMI context. Try to get the debug allocator lock, if it cannot
|
||||
* be obtained after a second then give up. If the lock could not be
|
||||
* previously obtained on this cpu then only try once.
|
||||
*
|
||||
* sparse has no annotation for "this function _sometimes_ acquires a
|
||||
* lock", so fudge the acquire/release notation.
|
||||
*/
|
||||
static DEFINE_SPINLOCK(dap_lock);
|
||||
static int get_dap_lock(void)
|
||||
__acquires(dap_lock)
|
||||
{
|
||||
static int dap_locked = -1;
|
||||
int count;
|
||||
if (dap_locked == smp_processor_id())
|
||||
count = 1;
|
||||
else
|
||||
count = 1000;
|
||||
while (1) {
|
||||
if (spin_trylock(&dap_lock)) {
|
||||
dap_locked = -1;
|
||||
return 1;
|
||||
}
|
||||
if (!count--)
|
||||
break;
|
||||
udelay(1000);
|
||||
}
|
||||
dap_locked = smp_processor_id();
|
||||
__acquire(dap_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void *debug_kmalloc(size_t size, gfp_t flags)
|
||||
{
|
||||
unsigned int rem, h_offset;
|
||||
struct debug_alloc_header *best, *bestprev, *prev, *h;
|
||||
void *p = NULL;
|
||||
if (!get_dap_lock()) {
|
||||
__release(dap_lock); /* we never actually got it */
|
||||
return NULL;
|
||||
}
|
||||
h = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
|
||||
if (dah_first_call) {
|
||||
h->size = sizeof(debug_alloc_pool_aligned) - dah_overhead;
|
||||
dah_first_call = 0;
|
||||
}
|
||||
size = ALIGN(size, dah_align);
|
||||
prev = best = bestprev = NULL;
|
||||
while (1) {
|
||||
if (h->size >= size && (!best || h->size < best->size)) {
|
||||
best = h;
|
||||
bestprev = prev;
|
||||
if (h->size == size)
|
||||
break;
|
||||
}
|
||||
if (!h->next)
|
||||
break;
|
||||
prev = h;
|
||||
h = (struct debug_alloc_header *)(debug_alloc_pool + h->next);
|
||||
}
|
||||
if (!best)
|
||||
goto out;
|
||||
rem = best->size - size;
|
||||
/* The pool must always contain at least one header */
|
||||
if (best->next == 0 && bestprev == NULL && rem < dah_overhead)
|
||||
goto out;
|
||||
if (rem >= dah_overhead) {
|
||||
best->size = size;
|
||||
h_offset = ((char *)best - debug_alloc_pool) +
|
||||
dah_overhead + best->size;
|
||||
h = (struct debug_alloc_header *)(debug_alloc_pool + h_offset);
|
||||
h->size = rem - dah_overhead;
|
||||
h->next = best->next;
|
||||
} else
|
||||
h_offset = best->next;
|
||||
best->caller = __builtin_return_address(0);
|
||||
dah_used += best->size;
|
||||
dah_used_max = max(dah_used, dah_used_max);
|
||||
if (bestprev)
|
||||
bestprev->next = h_offset;
|
||||
else
|
||||
dah_first = h_offset;
|
||||
p = (char *)best + dah_overhead;
|
||||
memset(p, POISON_INUSE, best->size - 1);
|
||||
*((char *)p + best->size - 1) = POISON_END;
|
||||
out:
|
||||
spin_unlock(&dap_lock);
|
||||
return p;
|
||||
}
|
||||
|
||||
void debug_kfree(void *p)
|
||||
{
|
||||
struct debug_alloc_header *h;
|
||||
unsigned int h_offset;
|
||||
if (!p)
|
||||
return;
|
||||
if ((char *)p < debug_alloc_pool ||
|
||||
(char *)p >= debug_alloc_pool + sizeof(debug_alloc_pool_aligned)) {
|
||||
kfree(p);
|
||||
return;
|
||||
}
|
||||
if (!get_dap_lock()) {
|
||||
__release(dap_lock); /* we never actually got it */
|
||||
return; /* memory leak, cannot be helped */
|
||||
}
|
||||
h = (struct debug_alloc_header *)((char *)p - dah_overhead);
|
||||
memset(p, POISON_FREE, h->size - 1);
|
||||
*((char *)p + h->size - 1) = POISON_END;
|
||||
h->caller = NULL;
|
||||
dah_used -= h->size;
|
||||
h_offset = (char *)h - debug_alloc_pool;
|
||||
if (h_offset < dah_first) {
|
||||
h->next = dah_first;
|
||||
dah_first = h_offset;
|
||||
} else {
|
||||
struct debug_alloc_header *prev;
|
||||
unsigned int prev_offset;
|
||||
prev = (struct debug_alloc_header *)(debug_alloc_pool +
|
||||
dah_first);
|
||||
while (1) {
|
||||
if (!prev->next || prev->next > h_offset)
|
||||
break;
|
||||
prev = (struct debug_alloc_header *)
|
||||
(debug_alloc_pool + prev->next);
|
||||
}
|
||||
prev_offset = (char *)prev - debug_alloc_pool;
|
||||
if (prev_offset + dah_overhead + prev->size == h_offset) {
|
||||
prev->size += dah_overhead + h->size;
|
||||
memset(h, POISON_FREE, dah_overhead - 1);
|
||||
*((char *)h + dah_overhead - 1) = POISON_END;
|
||||
h = prev;
|
||||
h_offset = prev_offset;
|
||||
} else {
|
||||
h->next = prev->next;
|
||||
prev->next = h_offset;
|
||||
}
|
||||
}
|
||||
if (h_offset + dah_overhead + h->size == h->next) {
|
||||
struct debug_alloc_header *next;
|
||||
next = (struct debug_alloc_header *)
|
||||
(debug_alloc_pool + h->next);
|
||||
h->size += dah_overhead + next->size;
|
||||
h->next = next->next;
|
||||
memset(next, POISON_FREE, dah_overhead - 1);
|
||||
*((char *)next + dah_overhead - 1) = POISON_END;
|
||||
}
|
||||
spin_unlock(&dap_lock);
|
||||
}
|
||||
|
||||
void debug_kusage(void)
|
||||
{
|
||||
struct debug_alloc_header *h_free, *h_used;
|
||||
#ifdef CONFIG_IA64
|
||||
/* FIXME: using dah for ia64 unwind always results in a memory leak.
|
||||
* Fix that memory leak first, then set debug_kusage_one_time = 1 for
|
||||
* all architectures.
|
||||
*/
|
||||
static int debug_kusage_one_time;
|
||||
#else
|
||||
static int debug_kusage_one_time = 1;
|
||||
#endif
|
||||
if (!get_dap_lock()) {
|
||||
__release(dap_lock); /* we never actually got it */
|
||||
return;
|
||||
}
|
||||
h_free = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
|
||||
if (dah_first == 0 &&
|
||||
(h_free->size == sizeof(debug_alloc_pool_aligned) - dah_overhead ||
|
||||
dah_first_call))
|
||||
goto out;
|
||||
if (!debug_kusage_one_time)
|
||||
goto out;
|
||||
debug_kusage_one_time = 0;
|
||||
kdb_func_printf("debug_kmalloc memory leak dah_first %d\n", dah_first);
|
||||
if (dah_first) {
|
||||
h_used = (struct debug_alloc_header *)debug_alloc_pool;
|
||||
kdb_func_printf("h_used %px size %d\n", h_used, h_used->size);
|
||||
}
|
||||
do {
|
||||
h_used = (struct debug_alloc_header *)
|
||||
((char *)h_free + dah_overhead + h_free->size);
|
||||
kdb_func_printf("h_used %px size %d caller %px\n",
|
||||
h_used, h_used->size, h_used->caller);
|
||||
h_free = (struct debug_alloc_header *)
|
||||
(debug_alloc_pool + h_free->next);
|
||||
} while (h_free->next);
|
||||
h_used = (struct debug_alloc_header *)
|
||||
((char *)h_free + dah_overhead + h_free->size);
|
||||
if ((char *)h_used - debug_alloc_pool !=
|
||||
sizeof(debug_alloc_pool_aligned))
|
||||
kdb_func_printf("h_used %px size %d caller %px\n",
|
||||
h_used, h_used->size, h_used->caller);
|
||||
out:
|
||||
spin_unlock(&dap_lock);
|
||||
}
|
||||
|
||||
/* Maintain a small stack of kdb_flags to allow recursion without disturbing
|
||||
* the global kdb state.
|
||||
*/
|
||||
|
||||
@ -147,11 +147,17 @@ static int kdb_ftdump(int argc, const char **argv)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static kdbtab_t ftdump_cmd = {
|
||||
.name = "ftdump",
|
||||
.func = kdb_ftdump,
|
||||
.usage = "[skip_#entries] [cpu]",
|
||||
.help = "Dump ftrace log; -skip dumps last #entries",
|
||||
.flags = KDB_ENABLE_ALWAYS_SAFE,
|
||||
};
|
||||
|
||||
static __init int kdb_ftrace_register(void)
|
||||
{
|
||||
kdb_register_flags("ftdump", kdb_ftdump, "[skip_#entries] [cpu]",
|
||||
"Dump ftrace log; -skip dumps last #entries", 0,
|
||||
KDB_ENABLE_ALWAYS_SAFE);
|
||||
kdb_register(&ftdump_cmd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
@ -28,28 +28,26 @@ static int kdb_hello_cmd(int argc, const char **argv)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static kdbtab_t hello_cmd = {
|
||||
.name = "hello",
|
||||
.func = kdb_hello_cmd,
|
||||
.usage = "[string]",
|
||||
.help = "Say Hello World or Hello [string]",
|
||||
};
|
||||
|
||||
static int __init kdb_hello_cmd_init(void)
|
||||
{
|
||||
/*
|
||||
* Registration of a dynamically added kdb command is done with
|
||||
* kdb_register() with the arguments being:
|
||||
* 1: The name of the shell command
|
||||
* 2: The function that processes the command
|
||||
* 3: Description of the usage of any arguments
|
||||
* 4: Descriptive text when you run help
|
||||
* 5: Number of characters to complete the command
|
||||
* 0 == type the whole command
|
||||
* 1 == match both "g" and "go" for example
|
||||
* kdb_register().
|
||||
*/
|
||||
kdb_register("hello", kdb_hello_cmd, "[string]",
|
||||
"Say Hello World or Hello [string]", 0);
|
||||
kdb_register(&hello_cmd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit kdb_hello_cmd_exit(void)
|
||||
{
|
||||
kdb_unregister("hello");
|
||||
kdb_unregister(&hello_cmd);
|
||||
}
|
||||
|
||||
module_init(kdb_hello_cmd_init);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user