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HardenedBSD/sys/ddb/ddb.h
Ryan Libby f0a7df4a6c ddb: make db_error reliably no-return 
Most code assumes db_error does not return, but according to
kdb_reenter_silent, there may be cases where it could.  Instead, panic
if kdb_reenter_silent returns and mark the routine as __dead2.  This
addresses gcc warnings.

Reported by:	GCC -Wmaybe-uninitialized
Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D45918
2024-07-09 10:59:27 -07:00

347 lines
11 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1993, Garrett A. Wollman.
* Copyright (c) 1993, University of Vermont and State Agricultural College.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Necessary declarations for the `ddb' kernel debugger.
*/
#ifndef _DDB_DDB_H_
#define _DDB_DDB_H_
#ifdef SYSCTL_DECL
SYSCTL_DECL(_debug_ddb);
#endif
#include <machine/db_machdep.h> /* type definitions */
#include <sys/queue.h> /* LIST_* */
#include <sys/kernel.h> /* SYSINIT */
#ifndef DB_MAXARGS
#define DB_MAXARGS 10
#endif
#ifndef DB_MAXLINE
#define DB_MAXLINE 120
#endif
#ifndef DB_MAXSCRIPTS
#define DB_MAXSCRIPTS 8
#endif
#ifndef DB_MAXSCRIPTNAME
#define DB_MAXSCRIPTNAME 32
#endif
#ifndef DB_MAXSCRIPTLEN
#define DB_MAXSCRIPTLEN 128
#endif
#ifndef DB_MAXSCRIPTRECURSION
#define DB_MAXSCRIPTRECURSION 3
#endif
#ifndef DB_CALL
#define DB_CALL db_fncall_generic
#else
int DB_CALL(db_expr_t, db_expr_t *, int, db_expr_t[]);
#endif
/*
* Extern variables to set the address and size of the symtab and strtab.
* Most users should use db_fetch_symtab in order to set them from the
* boot loader provided values.
*/
extern vm_offset_t ksymtab, kstrtab, ksymtab_size, ksymtab_relbase;
/* Command tables contain a list of commands. */
struct db_command;
LIST_HEAD(db_command_table, db_command);
#define _DB_TABLE_NAME(table) db_##table##_table
#define DB_DEFINE_TABLE(parent, name, table) \
struct db_command_table _DB_TABLE_NAME(table) = \
LIST_HEAD_INITIALIZER(_DB_TABLE_NAME(table)); \
_DB_SET(parent, name, NULL, 0, &_DB_TABLE_NAME(table))
#define DB_DECLARE_TABLE(table) \
extern struct db_command_table _DB_TABLE_NAME(table)
/*
* Builtin command tables:
* - cmd: Top-level command table; a list of these is displayed
* by typing 'help' at the debugger prompt.
* - show: Sub-commands of 'show'
* - show_all: Sub-commands of 'show all'
* - show_active: Sub-commands of 'show active'
*/
DB_DECLARE_TABLE(cmd);
DB_DECLARE_TABLE(show);
DB_DECLARE_TABLE(show_all);
DB_DECLARE_TABLE(show_active);
/*
* Type signature for a function implementing a ddb command.
*/
typedef void db_cmdfcn_t(db_expr_t addr, bool have_addr, db_expr_t count,
char *modif);
/*
* Command table entry.
*/
struct db_command {
char *name; /* command name */
db_cmdfcn_t *fcn; /* function to call */
int flag;
#define CS_OWN 0x1 /* non-standard syntax */
#define CS_MORE 0x2 /* standard syntax, but may have other words
* at end */
#define CS_SET_DOT 0x100 /* set dot after command */
#define DB_CMD_MEMSAFE 0x1000 /* Command does not allow reads or writes to
* arbitrary memory. */
#define DB_MAC1 0x10000 /* For MAC policy use */
#define DB_MAC2 0x20000
struct db_command_table *more; /* another level of command */
LIST_ENTRY(db_command) next; /* next entry in the command table */
void *mac_priv; /* For MAC policy use */
};
/*
* Arrange for the specified ddb command to be defined and
* bound to the specified function. Commands can be defined
* in modules in which case they will be available only when
* the module is loaded.
*/
#define _DB_SET(_table, _name, _func, _flag, _more) \
static struct db_command db_##_table##_##_name##_cmd = { \
.name = __STRING(_name), \
.fcn = _func, \
.flag = _flag, \
.more = _more \
}; \
\
static void \
db##_table##_##_name##_add(void *arg __unused) \
{ \
db_command_register(&_DB_TABLE_NAME(_table), \
&db_##_table##_##_name##_cmd); \
} \
SYSINIT(db_##_table##_##_name, SI_SUB_KLD, SI_ORDER_ANY, \
db##_table##_##_name##_add, NULL); \
\
static void \
db##_table##_##_name##_del(void *arg __unused) \
{ \
db_command_unregister(&_DB_TABLE_NAME(_table), \
&db_##_table##_##_name##_cmd); \
} \
SYSUNINIT(db_##_table##_##_name, SI_SUB_KLD, SI_ORDER_ANY, \
db##_table##_##_name##_del, NULL)
/*
* Like _DB_SET but also create the function declaration which
* must be followed immediately by the body; e.g.
* DB_TABLE_COMMAND_FLAGS(_cmd, panic, db_panic, 0)
* {
* ...panic implementation...
* }
*
* This macro is mostly used to define commands placed in one of
* the ddb command tables; see DB_COMMAND, etc. below.
*/
#define DB_TABLE_COMMAND_FLAGS(_table, _name, _func, _flag) \
static db_cmdfcn_t _func; \
_DB_SET(_table, _name, _func, _flag, NULL); \
static void \
_func(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
#define DB_TABLE_COMMAND(_table, _name, _func) \
DB_TABLE_COMMAND_FLAGS(_table, _name, _func, 0)
/* Wrappers around _DB_SET used for aliases. */
#define DB_TABLE_ALIAS_FLAGS(_table, _name, _func, _flag) \
_DB_SET(_table, _name, _func, _flag, NULL)
#define DB_TABLE_ALIAS(_table, _name, _func) \
DB_TABLE_ALIAS_FLAGS(_table, _name, _func, 0)
#define DB_COMMAND_FLAGS(cmd_name, func_name, flags) \
DB_TABLE_COMMAND_FLAGS(cmd, cmd_name, func_name, flags)
#define DB_COMMAND(cmd_name, func_name) \
DB_COMMAND_FLAGS(cmd_name, func_name, 0)
#define DB_ALIAS_FLAGS(alias_name, func_name, flags) \
DB_TABLE_ALIAS_FLAGS(cmd, alias_name, func_name, flags)
#define DB_ALIAS(alias_name, func_name) \
DB_ALIAS_FLAGS(alias_name, func_name, 0)
#define DB_SHOW_COMMAND_FLAGS(cmd_name, func_name, flags) \
DB_TABLE_COMMAND_FLAGS(show, cmd_name, func_name, flags)
#define DB_SHOW_COMMAND(cmd_name, func_name) \
DB_SHOW_COMMAND_FLAGS(cmd_name, func_name, 0)
#define DB_SHOW_ALIAS_FLAGS(alias_name, func_name, flags) \
DB_TABLE_ALIAS_FLAGS(show, alias_name, func_name, flags)
#define DB_SHOW_ALIAS(alias_name, func_name) \
DB_SHOW_ALIAS_FLAGS(alias_name, func_name, 0)
#define DB_SHOW_ALL_COMMAND(cmd_name, func_name) \
DB_TABLE_COMMAND_FLAGS(show_all, cmd_name, func_name, DB_CMD_MEMSAFE)
#define DB_SHOW_ALL_ALIAS(alias_name, func_name) \
DB_TABLE_ALIAS_FLAGS(show_all, alias_name, func_name, DB_CMD_MEMSAFE)
extern db_expr_t db_maxoff;
extern int db_indent;
extern int db_inst_count;
extern int db_load_count;
extern int db_store_count;
extern volatile int db_pager_quit;
extern db_expr_t db_radix;
extern db_expr_t db_max_width;
extern db_expr_t db_tab_stop_width;
extern db_expr_t db_lines_per_page;
struct thread;
struct vm_map;
void db_check_interrupt(void);
void db_clear_watchpoints(void);
db_addr_t db_disasm(db_addr_t loc, bool altfmt);
/* instruction disassembler */
void db_error(const char *s) __dead2;
int db_expression(db_expr_t *valuep);
int db_getc(void);
int db_get_variable(db_expr_t *valuep);
void db_iprintf(const char *,...) __printflike(1, 2);
struct proc *db_lookup_proc(db_expr_t addr);
struct thread *db_lookup_thread(db_expr_t addr, bool check_pid);
struct vm_map *db_map_addr(vm_offset_t);
bool db_map_current(struct vm_map *);
bool db_map_equal(struct vm_map *, struct vm_map *);
void db_md_list_watchpoints(void);
void db_print_loc_and_inst(db_addr_t loc);
void db_print_thread(void);
int db_printf(const char *fmt, ...) __printflike(1, 2);
int db_read_bytes(vm_offset_t addr, size_t size, char *data);
/* machine-dependent */
int db_readline(char *lstart, int lsize);
void db_restart_at_pc(bool watchpt);
int db_set_variable(db_expr_t value);
void db_set_watchpoints(void);
void db_skip_to_eol(void);
bool db_stop_at_pc(int type, int code, bool *is_breakpoint,
bool *is_watchpoint);
#define db_strcpy strcpy
void db_trace_self(void);
int db_trace_thread(struct thread *, int);
bool db_value_of_name(const char *name, db_expr_t *valuep);
bool db_value_of_name_pcpu(const char *name, db_expr_t *valuep);
bool db_value_of_name_vnet(const char *name, db_expr_t *valuep);
int db_write_bytes(vm_offset_t addr, size_t size, char *data);
void db_command_register(struct db_command_table *,
struct db_command *);
void db_command_unregister(struct db_command_table *,
struct db_command *);
int db_fetch_ksymtab(vm_offset_t ksym_start, vm_offset_t ksym_end,
vm_offset_t relbase);
db_cmdfcn_t db_breakpoint_cmd;
db_cmdfcn_t db_capture_cmd;
db_cmdfcn_t db_continue_cmd;
db_cmdfcn_t db_delete_cmd;
db_cmdfcn_t db_deletehwatch_cmd;
db_cmdfcn_t db_deletewatch_cmd;
db_cmdfcn_t db_examine_cmd;
db_cmdfcn_t db_findstack_cmd;
db_cmdfcn_t db_hwatchpoint_cmd;
db_cmdfcn_t db_listbreak_cmd;
db_cmdfcn_t db_scripts_cmd;
db_cmdfcn_t db_print_cmd;
db_cmdfcn_t db_ps;
db_cmdfcn_t db_run_cmd;
db_cmdfcn_t db_script_cmd;
db_cmdfcn_t db_search_cmd;
db_cmdfcn_t db_set_cmd;
db_cmdfcn_t db_set_thread;
db_cmdfcn_t db_show_regs;
db_cmdfcn_t db_show_threads;
db_cmdfcn_t db_single_step_cmd;
db_cmdfcn_t db_textdump_cmd;
db_cmdfcn_t db_trace_until_call_cmd;
db_cmdfcn_t db_trace_until_matching_cmd;
db_cmdfcn_t db_unscript_cmd;
db_cmdfcn_t db_watchpoint_cmd;
db_cmdfcn_t db_write_cmd;
db_cmdfcn_t db_pprint_cmd;
#ifdef HAS_HW_BREAKPOINT
void db_md_list_breakpoints(void);
db_cmdfcn_t db_deletehbreak_cmd;
db_cmdfcn_t db_hbreakpoint_cmd;
#endif
/*
* Interface between DDB and the DDB output capture facility.
*/
struct dumperinfo;
void db_capture_dump(struct dumperinfo *di);
void db_capture_enterpager(void);
void db_capture_exitpager(void);
void db_capture_write(char *buffer, u_int buflen);
void db_capture_writech(char ch);
/*
* Interface between DDB and the script facility.
*/
void db_script_kdbenter(const char *eventname); /* KDB enter event. */
/*
* Interface between DDB and the textdump facility.
*
* Text dump blocks are of a fixed size; textdump_block_buffer is a
* statically allocated buffer that code interacting with textdumps can use
* to prepare and hold a pending block in when calling writenextblock().
*/
#define TEXTDUMP_BLOCKSIZE 512
extern char textdump_block_buffer[TEXTDUMP_BLOCKSIZE];
void textdump_mkustar(char *block_buffer, const char *filename,
u_int size);
void textdump_restoreoff(off_t offset);
void textdump_saveoff(off_t *offsetp);
int textdump_writenextblock(struct dumperinfo *di, char *buffer);
/*
* Interface between the kernel and textdumps.
*/
extern int textdump_pending; /* Call textdump_dumpsys() instead. */
void textdump_dumpsys(struct dumperinfo *di);
#endif /* !_DDB_DDB_H_ */
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