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pointer doesn't point to the first instruction of that function, but rather to a descriptor. The descriptor has the address of the first instruction, as well as the value of the global pointer. The symbol table doesn't know anything about descriptors, so if you lookup the name of a function you get the address of the first instruction. The cast from the address, which is the result of the symbol lookup, to a function pointer as is done in db_fncall is therefore invalid. Abstract this detail behind the DB_CALL macro. By default DB_CALL is defined as db_fncall_generic, which yields the old behaviour. On ia64 the macro is defined as db_fncall_ia64, in which a descriptor is constructed to yield a valid function pointer. While here, introduce DB_MAXARGS. DB_MAXARGS replaces the existing (local) MAXARGS. The DB_MAXARGS macro can be defined by platforms to create a convenient maximum. By default this will be the legacy 10. On ia64 we define this macro to be 8, for 8 is the maximum number of arguments that can be passed in registers. This avoids having to implement spilling of arguments on the memory stack. Approved by: re (dwhite)
161 lines
5.2 KiB
C
161 lines
5.2 KiB
C
/*-
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* Copyright (c) 1993, Garrett A. Wollman.
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* Copyright (c) 1993, University of Vermont and State Agricultural College.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Necessary declarations for the `ddb' kernel debugger.
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*/
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#ifndef _DDB_DDB_H_
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#define _DDB_DDB_H_
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#include <machine/db_machdep.h> /* type definitions */
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#ifndef DB_MAXARGS
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#define DB_MAXARGS 10
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#endif
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#ifndef DB_CALL
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#define DB_CALL db_fncall_generic
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#else
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int DB_CALL(db_expr_t, db_expr_t *, int, db_expr_t[]);
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#endif
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typedef void db_cmdfcn_t(db_expr_t addr, boolean_t have_addr, db_expr_t count,
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char *modif);
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typedef void db_page_calloutfcn_t(void *arg);
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#define DB_COMMAND(cmd_name, func_name) \
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DB_SET(cmd_name, func_name, db_cmd_set, 0, NULL)
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#define DB_SHOW_COMMAND(cmd_name, func_name) \
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DB_SET(cmd_name, func_name, db_show_cmd_set, 0, NULL)
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#define DB_SET(cmd_name, func_name, set, flag, more) \
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static db_cmdfcn_t func_name; \
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\
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static const struct command __CONCAT(func_name,_cmd) = { \
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__STRING(cmd_name), \
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func_name, \
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flag, \
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more \
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}; \
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TEXT_SET(set, __CONCAT(func_name,_cmd)); \
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\
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static void \
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func_name(addr, have_addr, count, modif) \
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db_expr_t addr; \
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boolean_t have_addr; \
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db_expr_t count; \
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char *modif;
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extern db_expr_t db_maxoff;
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extern int db_indent;
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extern int db_inst_count;
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extern int db_load_count;
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extern int db_store_count;
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extern db_expr_t db_radix;
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extern db_expr_t db_max_width;
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extern db_expr_t db_tab_stop_width;
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extern db_expr_t db_lines_per_page;
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struct thread;
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struct vm_map;
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void db_check_interrupt(void);
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void db_clear_watchpoints(void);
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db_addr_t db_disasm(db_addr_t loc, boolean_t altfmt);
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/* instruction disassembler */
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void db_error(const char *s);
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int db_expression(db_expr_t *valuep);
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int db_get_variable(db_expr_t *valuep);
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void db_iprintf(const char *,...) __printflike(1, 2);
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struct vm_map *db_map_addr(vm_offset_t);
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boolean_t db_map_current(struct vm_map *);
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boolean_t db_map_equal(struct vm_map *, struct vm_map *);
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void db_print_loc_and_inst(db_addr_t loc);
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void db_print_thread(void);
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void db_printf(const char *fmt, ...) __printflike(1, 2);
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int db_read_bytes(vm_offset_t addr, size_t size, char *data);
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/* machine-dependent */
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int db_readline(char *lstart, int lsize);
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void db_restart_at_pc(boolean_t watchpt);
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int db_set_variable(db_expr_t value);
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void db_set_watchpoints(void);
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void db_setup_paging(db_page_calloutfcn_t *callout, void *arg,
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int maxlines);
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void db_skip_to_eol(void);
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boolean_t db_stop_at_pc(boolean_t *is_breakpoint);
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#define db_strcpy strcpy
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void db_trace_self(void);
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int db_trace_thread(struct thread *, int);
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int db_value_of_name(const char *name, db_expr_t *valuep);
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int db_write_bytes(vm_offset_t addr, size_t size, char *data);
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db_cmdfcn_t db_breakpoint_cmd;
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db_cmdfcn_t db_continue_cmd;
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db_cmdfcn_t db_delete_cmd;
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db_cmdfcn_t db_deletehwatch_cmd;
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db_cmdfcn_t db_deletewatch_cmd;
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db_cmdfcn_t db_examine_cmd;
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db_cmdfcn_t db_hwatchpoint_cmd;
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db_cmdfcn_t db_listbreak_cmd;
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db_cmdfcn_t db_print_cmd;
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db_cmdfcn_t db_ps;
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db_cmdfcn_t db_search_cmd;
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db_cmdfcn_t db_set_cmd;
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db_cmdfcn_t db_set_thread;
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db_cmdfcn_t db_show_regs;
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db_cmdfcn_t db_show_threads;
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db_cmdfcn_t db_single_step_cmd;
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db_cmdfcn_t db_trace_until_call_cmd;
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db_cmdfcn_t db_trace_until_matching_cmd;
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db_cmdfcn_t db_watchpoint_cmd;
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db_cmdfcn_t db_write_cmd;
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db_page_calloutfcn_t db_simple_pager;
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/*
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* Command table.
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*/
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struct command {
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char * name; /* command name */
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db_cmdfcn_t *fcn; /* function to call */
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int flag; /* extra info: */
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#define CS_OWN 0x1 /* non-standard syntax */
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#define CS_MORE 0x2 /* standard syntax, but may have other words
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* at end */
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#define CS_SET_DOT 0x100 /* set dot after command */
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struct command *more; /* another level of command */
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};
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#endif /* !_DDB_DDB_H_ */
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