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/*
* Copyright (c) 2004 Marcel Moolenaar
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <kvm.h>
#include <defs.h>
#include <command.h>
#include <frame-unwind.h>
#include <gdbthread.h>
#include <inferior.h>
#include <regcache.h>
#include <target.h>
#include "kgdb.h"
static struct target_ops kgdb_trgt_ops;
#define KERNOFF (kgdb_kernbase ())
#define INKERNEL(x) ((x) >= KERNOFF)
static CORE_ADDR
kgdb_kernbase (void)
{
static CORE_ADDR kernbase;
struct minimal_symbol *sym;
if (kernbase == 0) {
sym = lookup_minimal_symbol ("kernbase", NULL, NULL);
if (sym == NULL) {
kernbase = KERNBASE;
} else {
kernbase = SYMBOL_VALUE_ADDRESS (sym);
}
}
return kernbase;
}
static char *
kgdb_trgt_extra_thread_info(struct thread_info *ti)
{
static char buf[64];
char *p, *s;
p = buf + snprintf(buf, sizeof(buf), "PID=%d", ptid_get_pid(ti->ptid));
s = kgdb_thr_extra_thread_info(ptid_get_tid(ti->ptid));
if (s != NULL)
snprintf(p, sizeof(buf) - (p - buf), ": %s", s);
return (buf);
}
static void
kgdb_trgt_files_info(struct target_ops *target)
{
struct target_ops *tb;
tb = find_target_beneath(target);
if (tb->to_files_info != NULL)
tb->to_files_info(tb);
}
static void
kgdb_trgt_find_new_threads(void)
{
struct target_ops *tb;
if (kvm != NULL)
return;
tb = find_target_beneath(&kgdb_trgt_ops);
if (tb->to_find_new_threads != NULL)
tb->to_find_new_threads();
}
static char *
kgdb_trgt_pid_to_str(ptid_t ptid)
{
static char buf[33];
snprintf(buf, sizeof(buf), "Thread %ld", ptid_get_tid(ptid));
return (buf);
}
static int
kgdb_trgt_thread_alive(ptid_t ptid)
{
return (kgdb_thr_lookup_tid(ptid_get_tid(ptid)) != NULL);
}
static int
kgdb_trgt_xfer_memory(CORE_ADDR memaddr, char *myaddr, int len, int write,
struct mem_attrib *attrib, struct target_ops *target)
{
struct target_ops *tb;
if (kvm != NULL) {
if (len == 0)
return (0);
if (!write)
return (kvm_read(kvm, memaddr, myaddr, len));
else
return (kvm_write(kvm, memaddr, myaddr, len));
}
tb = find_target_beneath(target);
return (tb->to_xfer_memory(memaddr, myaddr, len, write, attrib, tb));
}
static void
kgdb_switch_to_thread(struct kthr *thr)
{
if (thr->tid == ptid_get_tid(inferior_ptid))
return;
inferior_ptid = ptid_build(thr->pid, 0, thr->tid);
flush_cached_frames ();
registers_changed ();
stop_pc = read_pc ();
select_frame (get_current_frame ());
}
static void
kgdb_set_proc_cmd (char *arg, int from_tty)
{
CORE_ADDR addr;
struct kthr *thr;
if (!arg)
error_no_arg ("proc address for the new context");
if (kvm == NULL)
error ("no kernel core file");
addr = (CORE_ADDR) parse_and_eval_address (arg);
if (!INKERNEL (addr)) {
thr = kgdb_thr_lookup_pid((int)addr);
if (thr == NULL)
error ("invalid pid");
} else {
thr = kgdb_thr_lookup_paddr(addr);
if (thr == NULL)
error("invalid proc address");
}
kgdb_switch_to_thread(thr);
}
static void
kgdb_set_tid_cmd (char *arg, int from_tty)
{
CORE_ADDR addr;
struct kthr *thr;
if (!arg)
error_no_arg ("TID or thread address for the new context");
if (kvm == NULL)
error ("no kernel core file");
addr = (CORE_ADDR) parse_and_eval_address (arg);
if (!INKERNEL (addr)) {
thr = kgdb_thr_lookup_tid((int)addr);
if (thr == NULL)
error ("invalid TID");
} else {
thr = kgdb_thr_lookup_taddr(addr);
if (thr == NULL)
error("invalid thread address");
}
kgdb_switch_to_thread(thr);
}
void
kgdb_target(void)
{
struct kthr *kt;
struct thread_info *ti;
kgdb_trgt_ops.to_magic = OPS_MAGIC;
kgdb_trgt_ops.to_shortname = "kernel";
kgdb_trgt_ops.to_longname = "kernel core files.";
kgdb_trgt_ops.to_doc = "Kernel core files.";
kgdb_trgt_ops.to_stratum = thread_stratum;
kgdb_trgt_ops.to_has_memory = 1;
kgdb_trgt_ops.to_has_registers = 1;
kgdb_trgt_ops.to_has_stack = 1;
kgdb_trgt_ops.to_extra_thread_info = kgdb_trgt_extra_thread_info;
kgdb_trgt_ops.to_fetch_registers = kgdb_trgt_fetch_registers;
kgdb_trgt_ops.to_files_info = kgdb_trgt_files_info;
kgdb_trgt_ops.to_find_new_threads = kgdb_trgt_find_new_threads;
kgdb_trgt_ops.to_pid_to_str = kgdb_trgt_pid_to_str;
kgdb_trgt_ops.to_store_registers = kgdb_trgt_store_registers;
kgdb_trgt_ops.to_thread_alive = kgdb_trgt_thread_alive;
kgdb_trgt_ops.to_xfer_memory = kgdb_trgt_xfer_memory;
add_target(&kgdb_trgt_ops);
push_target(&kgdb_trgt_ops);
kt = kgdb_thr_first();
while (kt != NULL) {
ti = add_thread(ptid_build(kt->pid, 0, kt->tid));
kt = kgdb_thr_next(kt);
}
if (curkthr != 0)
inferior_ptid = ptid_build(curkthr->pid, 0, curkthr->tid);
add_com ("proc", class_obscure, kgdb_set_proc_cmd,
"Set current process context");
add_com ("tid", class_obscure, kgdb_set_tid_cmd,
"Set current thread context");
add_com ("add-kld", class_files, kgdb_add_kld_cmd,
"Usage: add-kld FILE\n\
Load the symbols from the kernel loadable module FILE.");
}
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