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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 AUTHORS ``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 AUTHORS 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: head/gnu/usr.bin/gdb/kgdb/kthr.c 246893 2013-02-17 02:15:19Z marcel $");
#include <sys/param.h>
#include <sys/cpuset.h>
#include <sys/proc.h>
#include <stdbool.h>
#include <defs.h>
#include "gdbcore.h"
#include "objfiles.h"
#include "value.h"
#include "kgdb.h"
static CORE_ADDR dumppcb;
static LONGEST dumptid;
static CORE_ADDR stopped_cpus;
static LONGEST mp_maxid;
static struct kthr *first;
struct kthr *curkthr;
static int proc_off_p_pid, proc_off_p_comm, proc_off_p_list, proc_off_p_threads;
static int thread_off_td_tid, thread_off_td_oncpu, thread_off_td_pcb;
static int thread_off_td_name, thread_off_td_plist;
static int thread_oncpu_size;
CORE_ADDR
kgdb_lookup(const char *sym)
{
struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol(sym, NULL, NULL);
if (msym.minsym == NULL)
return (0);
return (BMSYMBOL_VALUE_ADDRESS(msym));
}
/*
* Perform the equivalent of CPU_ISSET() to see if 'cpu' is set in the
* kernel's stopped_cpus set. The set contains an array of longs.
* This function determines the specific long to read and tests the
* necessary bit in the long.
*/
static bool
cpu_stopped(int cpu)
{
struct gdbarch *gdbarch = target_gdbarch ();
CORE_ADDR addr;
ULONGEST mask;
int bit, long_bytes, word;
if (cpu < 0 || cpu > mp_maxid || stopped_cpus == 0)
return (false);
bit = cpu % gdbarch_long_bit (gdbarch);
word = cpu / gdbarch_long_bit (gdbarch);
long_bytes = gdbarch_long_bit (gdbarch) / 8;
addr = stopped_cpus + word * long_bytes;
mask = read_memory_unsigned_integer (addr, long_bytes,
gdbarch_byte_order (gdbarch));
return (mask & ((ULONGEST)1 << bit)) != 0;
}
struct kthr *
kgdb_thr_first(void)
{
return (first);
}
static void
kgdb_thr_add_procs(CORE_ADDR paddr, CORE_ADDR (*cpu_pcb_addr) (u_int))
{
struct gdbarch *gdbarch = target_gdbarch ();
struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct kthr *kt;
CORE_ADDR pcb, pnext, tdaddr, tdnext;
ULONGEST oncpu;
LONGEST pid, tid;
while (paddr != 0) {
TRY {
tdaddr = read_memory_typed_address (paddr +
proc_off_p_threads, ptr_type);
pid = read_memory_integer (paddr + proc_off_p_pid, 4,
byte_order);
pnext = read_memory_typed_address (paddr +
proc_off_p_list, ptr_type);
} CATCH(e, RETURN_MASK_ERROR) {
break;
} END_CATCH
while (tdaddr != 0) {
TRY {
tid = read_memory_integer (tdaddr +
thread_off_td_tid, 4, byte_order);
oncpu = read_memory_unsigned_integer (tdaddr +
thread_off_td_oncpu, thread_oncpu_size,
byte_order);
pcb = read_memory_typed_address (tdaddr +
thread_off_td_pcb, ptr_type);
tdnext = read_memory_typed_address (tdaddr +
thread_off_td_plist, ptr_type);
} CATCH(e, RETURN_MASK_ERROR) {
break;
} END_CATCH
kt = malloc(sizeof(*kt));
kt->next = first;
kt->kaddr = tdaddr;
if (tid == dumptid)
kt->pcb = dumppcb;
else if (cpu_stopped(oncpu))
kt->pcb = cpu_pcb_addr(oncpu);
else
kt->pcb = pcb;
kt->tid = tid;
kt->pid = pid;
kt->paddr = paddr;
kt->cpu = oncpu;
first = kt;
tdaddr = tdnext;
}
paddr = pnext;
}
}
struct kthr *
kgdb_thr_init(CORE_ADDR (*cpu_pcb_addr) (u_int))
{
struct gdbarch *gdbarch = target_gdbarch ();
struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct kthr *kt;
CORE_ADDR addr, paddr;
while (first != NULL) {
kt = first;
first = kt->next;
free(kt);
}
addr = kgdb_lookup("allproc");
if (addr == 0)
return (NULL);
TRY {
paddr = read_memory_typed_address (addr, ptr_type);
} CATCH(e, RETURN_MASK_ERROR) {
return (NULL);
} END_CATCH
dumppcb = kgdb_lookup("dumppcb");
if (dumppcb == 0)
return (NULL);
#if 1
TRY {
dumptid = parse_and_eval_long("dumptid");
} CATCH(e, RETURN_MASK_ERROR) {
dumptid = -1;
} END_CATCH
#else
addr = kgdb_lookup("dumptid");
if (addr != 0) {
TRY {
dumptid = read_memory_integer (addr, 4, byte_order);
} CATCH(e, RETURN_MASK_ERROR) {
dumptid = -1;
} END_CATCH
} else
dumptid = -1;
#endif
TRY {
mp_maxid = parse_and_eval_long("mp_maxid");
} CATCH(e, RETURN_MASK_ERROR) {
mp_maxid = 0;
} END_CATCH
stopped_cpus = kgdb_lookup("stopped_cpus");
/*
* Newer kernels export a set of global variables with the offsets
* of certain members in struct proc and struct thread. For older
* kernels, try to extract these offsets using debug symbols. If
* that fails, use native values.
*/
TRY {
proc_off_p_pid = parse_and_eval_long("proc_off_p_pid");
proc_off_p_comm = parse_and_eval_long("proc_off_p_comm");
proc_off_p_list = parse_and_eval_long("proc_off_p_list");
proc_off_p_threads = parse_and_eval_long("proc_off_p_threads");
thread_off_td_tid = parse_and_eval_long("thread_off_td_tid");
thread_off_td_name = parse_and_eval_long("thread_off_td_name");
thread_off_td_oncpu = parse_and_eval_long("thread_off_td_oncpu");
thread_off_td_pcb = parse_and_eval_long("thread_off_td_pcb");
thread_off_td_plist = parse_and_eval_long("thread_off_td_plist");
thread_oncpu_size = 4;
} CATCH(e, RETURN_MASK_ERROR) {
TRY {
proc_off_p_pid = parse_and_eval_address(
"&((struct proc *)0)->p_pid");
proc_off_p_comm = parse_and_eval_address(
"&((struct proc *)0)->p_comm");
proc_off_p_list = parse_and_eval_address(
"&((struct proc *)0)->p_list");
proc_off_p_threads = parse_and_eval_address(
"&((struct proc *)0)->p_threads");
thread_off_td_tid = parse_and_eval_address(
"&((struct thread *)0)->td_tid");
thread_off_td_name = parse_and_eval_address(
"&((struct thread *)0)->td_name");
thread_off_td_oncpu = parse_and_eval_address(
"&((struct thread *)0)->td_oncpu");
thread_off_td_pcb = parse_and_eval_address(
"&((struct thread *)0)->td_pcb");
thread_off_td_plist = parse_and_eval_address(
"&((struct thread *)0)->td_plist");
thread_oncpu_size = parse_and_eval_long(
"sizeof(((struct thread *)0)->td_oncpu)");
} CATCH(e, RETURN_MASK_ERROR) {
proc_off_p_pid = offsetof(struct proc, p_pid);
proc_off_p_comm = offsetof(struct proc, p_comm);
proc_off_p_list = offsetof(struct proc, p_list);
proc_off_p_threads = offsetof(struct proc, p_threads);
thread_off_td_tid = offsetof(struct thread, td_tid);
thread_off_td_name = offsetof(struct thread, td_name);
thread_off_td_oncpu = offsetof(struct thread, td_oncpu);
thread_off_td_pcb = offsetof(struct thread, td_pcb);
thread_off_td_plist = offsetof(struct thread, td_plist);
thread_oncpu_size =
sizeof(((struct thread *)0)->td_oncpu);
} END_CATCH
} END_CATCH
kgdb_thr_add_procs(paddr, cpu_pcb_addr);
addr = kgdb_lookup("zombproc");
if (addr != 0) {
TRY {
paddr = read_memory_typed_address (addr, ptr_type);
kgdb_thr_add_procs(paddr, cpu_pcb_addr);
} CATCH(e, RETURN_MASK_ERROR) {
} END_CATCH
}
curkthr = kgdb_thr_lookup_tid(dumptid);
if (curkthr == NULL)
curkthr = first;
return (first);
}
struct kthr *
kgdb_thr_lookup_tid(int tid)
{
struct kthr *kt;
kt = first;
while (kt != NULL && kt->tid != tid)
kt = kt->next;
return (kt);
}
struct kthr *
kgdb_thr_lookup_taddr(uintptr_t taddr)
{
struct kthr *kt;
kt = first;
while (kt != NULL && kt->kaddr != taddr)
kt = kt->next;
return (kt);
}
struct kthr *
kgdb_thr_lookup_pid(int pid)
{
struct kthr *kt;
kt = first;
while (kt != NULL && kt->pid != pid)
kt = kt->next;
return (kt);
}
struct kthr *
kgdb_thr_lookup_paddr(uintptr_t paddr)
{
struct kthr *kt;
kt = first;
while (kt != NULL && kt->paddr != paddr)
kt = kt->next;
return (kt);
}
struct kthr *
kgdb_thr_next(struct kthr *kt)
{
return (kt->next);
}
char *
kgdb_thr_extra_thread_info(int tid)
{
char comm[MAXCOMLEN + 1];
char td_name[MAXCOMLEN + 1];
struct kthr *kt;
static char buf[64];
kt = kgdb_thr_lookup_tid(tid);
if (kt == NULL)
return (NULL);
snprintf(buf, sizeof(buf), "PID=%d", kt->pid);
TRY {
read_memory_string (kt->paddr + proc_off_p_comm, comm,
sizeof(comm));
strlcat(buf, ": ", sizeof(buf));
strlcat(buf, comm, sizeof(buf));
read_memory_string (kt->kaddr + thread_off_td_name, td_name,
sizeof(td_name));
if (strcmp(comm, td_name) != 0) {
strlcat(buf, "/", sizeof(buf));
strlcat(buf, td_name, sizeof(buf));
}
} CATCH(e, RETURN_MASK_ERROR) {
} END_CATCH
return (buf);
}