old-cross-binutils/gdb/bsd-uthread.c
Pedro Alves 28439f5ef7 * corelow.c (get_core_registers): Adjust.
(core_file_thread_alive): Rename to...
	(core_thread_alive): ... this.
	(core_pid_to_str): Try gdbarch_core_pid_to_str first.
	(init_core_ops): Adjust.
	(coreops_suppress_target): Delete.
	(_initialize_corelow): Unconditionally add core_ops.
	* procfs.c: Include "inf-child.h".
	(procfs_ops): Delete.
	(init_procfs_ops): Delete.  Reimplement as...
	(procfs_target): ... this, inheriting from inf-child.
	(procfs_attach, procfs_detach, procfs_fetch_registers): Adjust.
	(procfs_prepare_to_store): Delete.
	(procfs_store_registers, procfs_resume): Adjust.
	(procfs_open): Delete.
	(procfs_suppress_run): Delete.
	(procfs_can_run): Delete.
	(procfs_mourn_inferior): Adjust.
	(procfs_init_inferior): Add target_ops parameter.  Adjust.
	(procfs_create_inferior): Don't pass procfs_init_inferior to
	fork_inferior.  Instead call it after fork_inferior returns.
	(procfs_find_new_threads): Adjust.
	(_initialize_procfs): Adjust to use procfs_target instead of
	init_procfs_ops.
	* sol-thread.c (orig_core_ops, sol_core_ops): Delete.
	(lwp_to_thread): Use target_thread_alive.
	(sol_thread_open): Delete.
	(sol_thread_attach): Delete.
	(sol_thread_detach, sol_thread_resume, sol_thread_wait)
	(sol_thread_fetch_registers, sol_thread_store_registers): Adjust
	to use find_target_beneath.
	(sol_thread_prepare_to_store, sol_thread_xfer_memory): Delete.
	(sol_thread_xfer_partial): Adjust to use find_target_beneath.
	(sol_thread_files_info, sol_thread_kill_inferior): Delete.
	(check_for_thread_db): New.
	(sol_thread_notice_signals, sol_thread_create_inferior): Delete.
	(sol_thread_new_objfile): Call check_for_thread_db.
	(sol_thread_mourn_inferior): Adjust to use find_target_beneath.
	(sol_thread_can_run): Delete.
	(sol_thread_alive): Adjust to use find_target_beneath.
	(sol_thread_stop): Delete.
	(rw_common): Use target_write_memory or target_read_memory.
	(ps_lgetregs, ps_lgetfpregs): Use target_fetch_registers.
	(ps_lsetregs, ps_lsetfpregs): Use target_store_registers.
	(solaris_pid_to_str): Remove check for libthread_db initialization
	failing.
	(sol_find_new_threads): Remove check for libthread_db
	initialization failing, or for an invalid inferior_ptid.  Adjust
	to use find_target_beneath.
	(sol_core_open, sol_core_close, sol_core_detach,
	sol_core_files_info, sol_find_memory_regions,
	sol_make_note_section, ignore): Delete.
	(init_sol_thread_ops): Make it a thread_stratum target.  Remove
	unneeded callback settings.
	(init_sol_core_ops): Delete.
	(_initialize_sol_thread): No longer call init_sol_core_ops, set
	procfs_suppress_run, or hack with core_ops.

	* target.h (struct target_ops): Add a target_ops * parameter to
	to_resume, to_fetch_registers, to_store_registers, to_thread_alive
	and to_find_new_threads.
	(target_fetch_registers, target_store_registers)
	(target_thread_alive, target_find_new_threads): Redeclare as
	function.

	* target.c (update_current_target): Do not inherit or de_fault
	to_resume, to_fetch_registers, to_store_registers,
	to_thread_alive, to_find_new_threads.
	(target_resume): Adjust.
	(target_thread_alive, target_find_new_threads): New.
	(debug_to_resume, debug_to_fetch_registers): Delete.
	(target_fetch_registers): New.
	(debug_to_store_registers): Delete.
	(target_store_registers): New.
	(debug_to_thread_alive, debug_to_find_new_threads): Delete.
	(setup_target_debug): Adjust.

	* gdbcore.h (core_ops): Delete declaration.

	* inf-ptrace.c, linux-nat.c, remote.c, amd64-linux-nat.c,
	inf-child.c, linux-thread-db.c, bsd-uthread.c, inf-ttrace.c,
	i386-sol2-tdep.c, darwin-nat.c, gnu-nat.c, go32-nat.c,
	hpux-thread.c, i386-linux-nat.c, i386fbsd-nat.c, monitor.c,
	nto-procfs.c, remote-m32r-sdi.c, remote-mips.c, windows-nat.c,
	alphabsd-nat.c, amd64bsd-nat.c, arm-linux-nat.c, armnbsd-nat.c,
	bsd-kvm.c, hppa-hpux-nat.c, hppa-linux-nat.c, hppabsd-nat.c,
	hppanbsd-nat.c, i386-darwin-nat.c, i386bsd-nat.c,
	ia64-linux-nat.c, m32r-linux-nat.c, m68kbsd-nat.c,
	m68klinux-nat.c, m88kbsd-nat.c, mips-linux-nat.c,
	mips64obsd-nat.c, mipsnbsd-nat.c, ppc-linux-nat.c, ppcnbsd-nat.c,
	ppcobsd-nat.c, remote-sim.c, rs6000-nat.c, s390-nat.c,
	shnbsd-nat.c, sparc-nat.c, sparc-nat.h, spu-linux-nat.c,
	vaxbsd-nat.c, xtensa-linux-nat.c: Adjust to target_ops changes.

	* gdbarch.sh (core_pid_to_str): New gdbarch callback.
	* gdbarch.h, gdbarch.c: Regenerate.

	* sol2-tdep.c: Include "inferior.h".
	(sol2_core_pid_to_str): New.
	* sol2-tdep.h (sol2_core_pid_to_str): Declare.

	* amd64-sol2-tdep.c (amd64_sol2_init_abi): Set it.
	* sparc-sol2-tdep.c (sparc32_sol2_init_abi): Set it.
	* sparc64-sol2-tdep.c (sparc64_sol2_init_abi): Set it.
	* i386-sol2-tdep.c (i386_sol2_init_abi): Set it.
2009-02-23 00:03:50 +00:00

552 lines
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/* BSD user-level threads support.
Copyright (C) 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcore.h"
#include "gdbthread.h"
#include "inferior.h"
#include "objfiles.h"
#include "observer.h"
#include "regcache.h"
#include "solib.h"
#include "solist.h"
#include "symfile.h"
#include "target.h"
#include "gdb_assert.h"
#include "gdb_obstack.h"
#include "bsd-uthread.h"
/* HACK: Save the bsd_uthreads ops returned by bsd_uthread_target. */
static struct target_ops *bsd_uthread_ops_hack;
/* Architecture-specific operations. */
/* Per-architecture data key. */
static struct gdbarch_data *bsd_uthread_data;
struct bsd_uthread_ops
{
/* Supply registers for an inactive thread to a register cache. */
void (*supply_uthread)(struct regcache *, int, CORE_ADDR);
/* Collect registers for an inactive thread from a register cache. */
void (*collect_uthread)(const struct regcache *, int, CORE_ADDR);
};
static void *
bsd_uthread_init (struct obstack *obstack)
{
struct bsd_uthread_ops *ops;
ops = OBSTACK_ZALLOC (obstack, struct bsd_uthread_ops);
return ops;
}
/* Set the function that supplies registers from an inactive thread
for architecture GDBARCH to SUPPLY_UTHREAD. */
void
bsd_uthread_set_supply_uthread (struct gdbarch *gdbarch,
void (*supply_uthread) (struct regcache *,
int, CORE_ADDR))
{
struct bsd_uthread_ops *ops = gdbarch_data (gdbarch, bsd_uthread_data);
ops->supply_uthread = supply_uthread;
}
/* Set the function that collects registers for an inactive thread for
architecture GDBARCH to SUPPLY_UTHREAD. */
void
bsd_uthread_set_collect_uthread (struct gdbarch *gdbarch,
void (*collect_uthread) (const struct regcache *,
int, CORE_ADDR))
{
struct bsd_uthread_ops *ops = gdbarch_data (gdbarch, bsd_uthread_data);
ops->collect_uthread = collect_uthread;
}
/* Magic number to help recognize a valid thread structure. */
#define BSD_UTHREAD_PTHREAD_MAGIC 0xd09ba115
/* Check whether the thread structure at ADDR is valid. */
static void
bsd_uthread_check_magic (CORE_ADDR addr)
{
ULONGEST magic = read_memory_unsigned_integer (addr, 4);
if (magic != BSD_UTHREAD_PTHREAD_MAGIC)
error (_("Bad magic"));
}
/* Thread states. */
#define BSD_UTHREAD_PS_RUNNING 0
#define BSD_UTHREAD_PS_DEAD 18
/* Address of the pointer to the the thread structure for the running
thread. */
static CORE_ADDR bsd_uthread_thread_run_addr;
/* Address of the list of all threads. */
static CORE_ADDR bsd_uthread_thread_list_addr;
/* Offsets of various "interesting" bits in the thread structure. */
static int bsd_uthread_thread_state_offset = -1;
static int bsd_uthread_thread_next_offset = -1;
static int bsd_uthread_thread_ctx_offset;
/* Name of shared threads library. */
static const char *bsd_uthread_solib_name;
/* Non-zero if the thread startum implemented by this module is active. */
static int bsd_uthread_active;
static CORE_ADDR
bsd_uthread_lookup_address (const char *name, struct objfile *objfile)
{
struct minimal_symbol *sym;
sym = lookup_minimal_symbol (name, NULL, objfile);
if (sym)
return SYMBOL_VALUE_ADDRESS (sym);
return 0;
}
static int
bsd_uthread_lookup_offset (const char *name, struct objfile *objfile)
{
CORE_ADDR addr;
addr = bsd_uthread_lookup_address (name, objfile);
if (addr == 0)
return 0;
return read_memory_unsigned_integer (addr, 4);
}
static CORE_ADDR
bsd_uthread_read_memory_address (CORE_ADDR addr)
{
struct type *ptr_type = builtin_type (target_gdbarch)->builtin_data_ptr;
return read_memory_typed_address (addr, ptr_type);
}
/* If OBJFILE contains the symbols corresponding to one of the
supported user-level threads libraries, activate the thread stratum
implemented by this module. */
static int
bsd_uthread_activate (struct objfile *objfile)
{
struct gdbarch *gdbarch = current_gdbarch;
struct bsd_uthread_ops *ops = gdbarch_data (gdbarch, bsd_uthread_data);
/* Skip if the thread stratum has already been activated. */
if (bsd_uthread_active)
return 0;
/* There's no point in enabling this module if no
architecture-specific operations are provided. */
if (!ops->supply_uthread)
return 0;
bsd_uthread_thread_run_addr =
bsd_uthread_lookup_address ("_thread_run", objfile);
if (bsd_uthread_thread_run_addr == 0)
return 0;
bsd_uthread_thread_list_addr =
bsd_uthread_lookup_address ("_thread_list", objfile);
if (bsd_uthread_thread_list_addr == 0)
return 0;
bsd_uthread_thread_state_offset =
bsd_uthread_lookup_offset ("_thread_state_offset", objfile);
if (bsd_uthread_thread_state_offset == 0)
return 0;
bsd_uthread_thread_next_offset =
bsd_uthread_lookup_offset ("_thread_next_offset", objfile);
if (bsd_uthread_thread_next_offset == 0)
return 0;
bsd_uthread_thread_ctx_offset =
bsd_uthread_lookup_offset ("_thread_ctx_offset", objfile);
push_target (bsd_uthread_ops_hack);
bsd_uthread_active = 1;
return 1;
}
/* Cleanup due to deactivation. */
static void
bsd_uthread_close (int quitting)
{
bsd_uthread_active = 0;
bsd_uthread_thread_run_addr = 0;
bsd_uthread_thread_list_addr = 0;
bsd_uthread_thread_state_offset = 0;
bsd_uthread_thread_next_offset = 0;
bsd_uthread_thread_ctx_offset = 0;
bsd_uthread_solib_name = NULL;
}
/* Deactivate the thread stratum implemented by this module. */
static void
bsd_uthread_deactivate (void)
{
/* Skip if the thread stratum has already been deactivated. */
if (!bsd_uthread_active)
return;
unpush_target (bsd_uthread_ops_hack);
}
static void
bsd_uthread_inferior_created (struct target_ops *ops, int from_tty)
{
bsd_uthread_activate (NULL);
}
/* Likely candidates for the threads library. */
static const char *bsd_uthread_solib_names[] =
{
"/usr/lib/libc_r.so", /* FreeBSD */
"/usr/lib/libpthread.so", /* OpenBSD */
NULL
};
static void
bsd_uthread_solib_loaded (struct so_list *so)
{
const char **names = bsd_uthread_solib_names;
for (names = bsd_uthread_solib_names; *names; names++)
{
if (strncmp (so->so_original_name, *names, strlen (*names)) == 0)
{
solib_read_symbols (so, so->from_tty);
if (bsd_uthread_activate (so->objfile))
{
bsd_uthread_solib_name = so->so_original_name;
return;
}
}
}
}
static void
bsd_uthread_solib_unloaded (struct so_list *so)
{
if (!bsd_uthread_solib_name)
return;
if (strcmp (so->so_original_name, bsd_uthread_solib_name) == 0)
bsd_uthread_deactivate ();
}
static void
bsd_uthread_mourn_inferior (struct target_ops *ops)
{
struct target_ops *beneath = find_target_beneath (ops);
beneath->to_mourn_inferior (beneath);
bsd_uthread_deactivate ();
}
static void
bsd_uthread_fetch_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct bsd_uthread_ops *uthread_ops = gdbarch_data (gdbarch, bsd_uthread_data);
CORE_ADDR addr = ptid_get_tid (inferior_ptid);
struct target_ops *beneath = find_target_beneath (ops);
CORE_ADDR active_addr;
/* Always fetch the appropriate registers from the layer beneath. */
beneath->to_fetch_registers (beneath, regcache, regnum);
/* FIXME: That might have gotten us more than we asked for. Make
sure we overwrite all relevant registers with values from the
thread structure. This can go once we fix the underlying target. */
regnum = -1;
active_addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
if (addr != 0 && addr != active_addr)
{
bsd_uthread_check_magic (addr);
uthread_ops->supply_uthread (regcache, regnum,
addr + bsd_uthread_thread_ctx_offset);
}
}
static void
bsd_uthread_store_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = get_regcache_arch (regcache);
struct bsd_uthread_ops *uthread_ops = gdbarch_data (gdbarch, bsd_uthread_data);
struct target_ops *beneath = find_target_beneath (ops);
CORE_ADDR addr = ptid_get_tid (inferior_ptid);
CORE_ADDR active_addr;
active_addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
if (addr != 0 && addr != active_addr)
{
bsd_uthread_check_magic (addr);
uthread_ops->collect_uthread (regcache, regnum,
addr + bsd_uthread_thread_ctx_offset);
}
else
{
/* Updating the thread that is currently running; pass the
request to the layer beneath. */
beneath->to_store_registers (beneath, regcache, regnum);
}
}
/* FIXME: This function is only there because otherwise GDB tries to
invoke deprecate_xfer_memory. */
static LONGEST
bsd_uthread_xfer_partial (struct target_ops *ops, enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, LONGEST len)
{
gdb_assert (ops->beneath->to_xfer_partial);
return ops->beneath->to_xfer_partial (ops->beneath, object, annex, readbuf,
writebuf, offset, len);
}
static ptid_t
bsd_uthread_wait (struct target_ops *ops,
ptid_t ptid, struct target_waitstatus *status)
{
CORE_ADDR addr;
struct target_ops *beneath = find_target_beneath (ops);
/* Pass the request to the layer beneath. */
ptid = beneath->to_wait (beneath, ptid, status);
/* If the process is no longer alive, there's no point in figuring
out the thread ID. It will fail anyway. */
if (status->kind == TARGET_WAITKIND_SIGNALLED
|| status->kind == TARGET_WAITKIND_EXITED)
return ptid;
/* Fetch the corresponding thread ID, and augment the returned
process ID with it. */
addr = bsd_uthread_read_memory_address (bsd_uthread_thread_run_addr);
if (addr != 0)
{
gdb_byte buf[4];
/* FIXME: For executables linked statically with the threads
library, we end up here before the program has actually been
executed. In that case ADDR will be garbage since it has
been read from the wrong virtual memory image. */
if (target_read_memory (addr, buf, 4) == 0)
{
ULONGEST magic = extract_unsigned_integer (buf, 4);
if (magic == BSD_UTHREAD_PTHREAD_MAGIC)
ptid = ptid_build (ptid_get_pid (ptid), 0, addr);
}
}
/* If INFERIOR_PTID doesn't have a tid member yet, and we now have a
ptid with tid set, then ptid is still the initial thread of
the process. Notify GDB core about it. */
if (ptid_get_tid (inferior_ptid) == 0
&& ptid_get_tid (ptid) != 0 && !in_thread_list (ptid))
thread_change_ptid (inferior_ptid, ptid);
/* Don't let the core see a ptid without a corresponding thread. */
if (!in_thread_list (ptid) || is_exited (ptid))
add_thread (ptid);
return ptid;
}
static void
bsd_uthread_resume (struct target_ops *ops,
ptid_t ptid, int step, enum target_signal sig)
{
/* Pass the request to the layer beneath. */
struct target_ops *beneath = find_target_beneath (ops);
beneath->to_resume (beneath, ptid, step, sig);
}
static int
bsd_uthread_thread_alive (struct target_ops *ops, ptid_t ptid)
{
struct target_ops *beneath = find_target_beneath (ops);
CORE_ADDR addr = ptid_get_tid (inferior_ptid);
if (addr != 0)
{
int offset = bsd_uthread_thread_state_offset;
ULONGEST state;
bsd_uthread_check_magic (addr);
state = read_memory_unsigned_integer (addr + offset, 4);
if (state == BSD_UTHREAD_PS_DEAD)
return 0;
}
return beneath->to_thread_alive (beneath, ptid);
}
static void
bsd_uthread_find_new_threads (struct target_ops *ops)
{
pid_t pid = ptid_get_pid (inferior_ptid);
int offset = bsd_uthread_thread_next_offset;
CORE_ADDR addr;
addr = bsd_uthread_read_memory_address (bsd_uthread_thread_list_addr);
while (addr != 0)
{
ptid_t ptid = ptid_build (pid, 0, addr);
if (!in_thread_list (ptid) || is_exited (ptid))
{
/* If INFERIOR_PTID doesn't have a tid member yet, then ptid
is still the initial thread of the process. Notify GDB
core about it. */
if (ptid_get_tid (inferior_ptid) == 0)
thread_change_ptid (inferior_ptid, ptid);
else
add_thread (ptid);
}
addr = bsd_uthread_read_memory_address (addr + offset);
}
}
/* Possible states a thread can be in. */
static char *bsd_uthread_state[] =
{
"RUNNING",
"SIGTHREAD",
"MUTEX_WAIT",
"COND_WAIT",
"FDLR_WAIT",
"FDLW_WAIT",
"FDR_WAIT",
"FDW_WAIT",
"FILE_WAIT",
"POLL_WAIT",
"SELECT_WAIT",
"SLEEP_WAIT",
"WAIT_WAIT",
"SIGSUSPEND",
"SIGWAIT",
"SPINBLOCK",
"JOIN",
"SUSPENDED",
"DEAD",
"DEADLOCK"
};
/* Return a string describing th state of the thread specified by
INFO. */
static char *
bsd_uthread_extra_thread_info (struct thread_info *info)
{
CORE_ADDR addr = ptid_get_tid (info->ptid);
if (addr != 0)
{
int offset = bsd_uthread_thread_state_offset;
ULONGEST state;
state = read_memory_unsigned_integer (addr + offset, 4);
if (state < ARRAY_SIZE (bsd_uthread_state))
return bsd_uthread_state[state];
}
return NULL;
}
static char *
bsd_uthread_pid_to_str (struct target_ops *ops, ptid_t ptid)
{
if (ptid_get_tid (ptid) != 0)
{
static char buf[64];
xsnprintf (buf, sizeof buf, "process %d, thread 0x%lx",
ptid_get_pid (ptid), ptid_get_tid (ptid));
return buf;
}
return normal_pid_to_str (ptid);
}
static struct target_ops *
bsd_uthread_target (void)
{
struct target_ops *t = XZALLOC (struct target_ops);
t->to_shortname = "bsd-uthreads";
t->to_longname = "BSD user-level threads";
t->to_doc = "BSD user-level threads";
t->to_close = bsd_uthread_close;
t->to_mourn_inferior = bsd_uthread_mourn_inferior;
t->to_fetch_registers = bsd_uthread_fetch_registers;
t->to_store_registers = bsd_uthread_store_registers;
t->to_xfer_partial = bsd_uthread_xfer_partial;
t->to_wait = bsd_uthread_wait;
t->to_resume = bsd_uthread_resume;
t->to_thread_alive = bsd_uthread_thread_alive;
t->to_find_new_threads = bsd_uthread_find_new_threads;
t->to_extra_thread_info = bsd_uthread_extra_thread_info;
t->to_pid_to_str = bsd_uthread_pid_to_str;
t->to_stratum = thread_stratum;
t->to_magic = OPS_MAGIC;
bsd_uthread_ops_hack = t;
return t;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_bsd_uthread;
void
_initialize_bsd_uthread (void)
{
add_target (bsd_uthread_target ());
bsd_uthread_data = gdbarch_data_register_pre_init (bsd_uthread_init);
observer_attach_inferior_created (bsd_uthread_inferior_created);
observer_attach_solib_loaded (bsd_uthread_solib_loaded);
observer_attach_solib_unloaded (bsd_uthread_solib_unloaded);
}