44ee4a526d
Seems to me that we can simplify DEC thread's target_update_thread_list implementation, avoiding the need to build the array of GDB threads. I have no way to test this, but then again support for Tru64 is about to be removed. Pushing anyway to have the last version in git be the cleanest one should start from, if this file turns out to be resurrected in the future. gdb/ 2014-10-15 Pedro Alves <palves@redhat.com> * dec-thread.c (dec_thread_count_gdb_threads) (dec_thread_add_gdb_thread): Delete. (dec_thread_update_thread_list): Delete. (dec_thread_find_new_threads): Rename to ... (dec_thread_update_thread_list): ... this. Delete GDB-size threads that are no longer found in dec_thread_list. (resync_thread_list): Delete. (dec_thread_wait): Call dec_thread_update_thread_list instead of resync_thread_list.
706 lines
18 KiB
C
706 lines
18 KiB
C
/* Copyright (C) 2008-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "observer.h"
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#include <sys/procfs.h>
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#include "gregset.h"
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#include "regcache.h"
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#include "inferior.h"
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#include "gdbthread.h"
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#include <pthread_debug.h>
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/* Print debugging traces if set to non-zero. */
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static int debug_dec_thread = 0;
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/* Non-zero if the dec-thread layer is active. */
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static int dec_thread_active = 0;
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/* The pthread_debug context. */
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pthreadDebugContext_t debug_context;
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/* The dec-thread target_ops structure. */
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static struct target_ops dec_thread_ops;
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/* Print a debug trace if DEBUG_DEC_THREAD is set (its value is adjusted
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by the user using "set debug dec-thread ..."). */
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static void
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debug (char *format, ...)
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{
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if (debug_dec_thread)
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{
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va_list args;
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va_start (args, format);
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printf_unfiltered ("DEC Threads: ");
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vprintf_unfiltered (format, args);
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printf_unfiltered ("\n");
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va_end (args);
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}
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}
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/* pthread debug callbacks. */
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static int
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suspend_clbk (void *caller_context)
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{
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return ESUCCESS;
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}
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static int
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resume_clbk (void *caller_context)
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{
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return ESUCCESS;
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}
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static int
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hold_clbk (void *caller_context, pthreadDebugKId_t kernel_tid)
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{
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return ESUCCESS;
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}
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static int
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unhold_clbk (void *caller_context, pthreadDebugKId_t kernel_tid)
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{
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return ESUCCESS;
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}
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static int
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read_clbk (void *caller_context, void *address, void *buffer,
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unsigned long size)
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{
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int status = target_read_memory ((CORE_ADDR) address, buffer, size);
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if (status != 0)
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return EINVAL;
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return ESUCCESS;
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}
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static int
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write_clbk (void *caller_context, void *address, void *buffer,
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unsigned long size)
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{
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int status = target_write_memory ((CORE_ADDR) address, buffer, size);
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if (status != 0)
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return EINVAL;
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return ESUCCESS;
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}
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/* Get integer regs. */
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static int
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get_reg_clbk(void *caller_context, pthreadDebugGetRegRtn_t regs,
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pthreadDebugKId_t kernel_tid)
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{
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debug ("get_reg_clbk");
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/* Not sure that we actually need to do anything in this callback. */
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return ESUCCESS;
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}
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/* Set integer regs. */
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static int
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set_reg_clbk(void *caller_context, const pthreadDebugRegs_t *regs,
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pthreadDebugKId_t kernel_tid)
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{
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debug ("set_reg_clbk");
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/* Not sure that we actually need to do anything in this callback. */
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return ESUCCESS;
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}
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static int
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output_clbk (void *caller_context, char *line)
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{
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printf_filtered ("%s\n", line);
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return ESUCCESS;
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}
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static int
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error_clbk (void *caller_context, char *line)
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{
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fprintf_filtered (gdb_stderr, "%s\n", line);
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return ESUCCESS;
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}
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/* Get floating-point regs. */
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static int
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get_fpreg_clbk (void *caller_context, pthreadDebugFregs_p fregs,
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pthreadDebugKId_t kernel_tid)
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{
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debug ("get_fpreg_clbk");
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/* Not sure that we actually need to do anything in this callback. */
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return ESUCCESS;
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}
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/* Set floating-point regs. */
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static int
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set_fpreg_clbk (void *caller_context, const pthreadDebugFregs_t *fregs,
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pthreadDebugKId_t kernel_tid)
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{
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debug ("set_fpreg_clbk");
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/* Not sure that we actually need to do anything in this callback. */
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return ESUCCESS;
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}
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static void *
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malloc_clbk (void *caller_context, size_t size)
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{
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return xmalloc (size);
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}
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static void
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free_clbk (void *caller_context, void *address)
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{
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xfree (address);
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}
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static int
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kthdinfo_clbk (pthreadDebugClient_t caller_context,
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pthreadDebugKId_t kernel_tid,
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pthreadDebugKThreadInfo_p thread_info)
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{
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return ENOTSUP;
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}
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static int
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speckthd_clbk (pthreadDebugClient_t caller_context,
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pthreadDebugSpecialType_t type,
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pthreadDebugKId_t *kernel_tid)
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{
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return ENOTSUP;
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}
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static pthreadDebugCallbacks_t debug_callbacks =
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{
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PTHREAD_DEBUG_VERSION,
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(pthreadDebugGetMemRtn_t) read_clbk,
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(pthreadDebugSetMemRtn_t) write_clbk,
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suspend_clbk,
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resume_clbk,
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kthdinfo_clbk,
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hold_clbk,
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unhold_clbk,
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(pthreadDebugGetFregRtn_t) get_fpreg_clbk,
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(pthreadDebugSetFregRtn_t) set_fpreg_clbk,
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(pthreadDebugGetRegRtn_t) get_reg_clbk,
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(pthreadDebugSetRegRtn_t) set_reg_clbk,
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(pthreadDebugOutputRtn_t) output_clbk,
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(pthreadDebugOutputRtn_t) error_clbk,
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malloc_clbk,
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free_clbk,
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speckthd_clbk
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};
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/* Activate thread support if appropriate. Do nothing if thread
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support is already active. */
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static void
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enable_dec_thread (void)
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{
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struct bound_minimal_symbol msym;
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void* caller_context;
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int status;
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/* If already active, nothing more to do. */
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if (dec_thread_active)
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return;
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msym = lookup_minimal_symbol ("__pthread_dbg_symtable", NULL, NULL);
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if (msym.minsym == NULL)
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{
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debug ("enable_dec_thread: No __pthread_dbg_symtable");
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return;
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}
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status = pthreadDebugContextInit (&caller_context, &debug_callbacks,
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(void *) SYMBOL_VALUE_ADDRESS (msym.minsym),
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&debug_context);
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if (status != ESUCCESS)
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{
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debug ("enable_dec_thread: pthreadDebugContextInit -> %d",
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status);
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return;
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}
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push_target (&dec_thread_ops);
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dec_thread_active = 1;
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debug ("enable_dec_thread: Thread support enabled.");
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}
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/* Deactivate thread support. Do nothing if thread support is
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already inactive. */
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static void
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disable_dec_thread (void)
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{
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if (!dec_thread_active)
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return;
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pthreadDebugContextDestroy (debug_context);
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unpush_target (&dec_thread_ops);
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dec_thread_active = 0;
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}
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/* A structure that contains a thread ID and is associated
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pthreadDebugThreadInfo_t data. */
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struct dec_thread_info
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{
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pthreadDebugId_t thread;
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pthreadDebugThreadInfo_t info;
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};
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typedef struct dec_thread_info dec_thread_info_s;
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/* The list of user threads. */
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DEF_VEC_O (dec_thread_info_s);
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VEC(dec_thread_info_s) *dec_thread_list;
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/* Release the memory used by the given VECP thread list pointer.
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Then set *VECP to NULL. */
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static void
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free_dec_thread_info_vec (VEC(dec_thread_info_s) **vecp)
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{
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int i;
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struct dec_thread_info *item;
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VEC(dec_thread_info_s) *vec = *vecp;
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for (i = 0; VEC_iterate (dec_thread_info_s, vec, i, item); i++)
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xfree (item);
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VEC_free (dec_thread_info_s, vec);
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*vecp = NULL;
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}
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/* Return a thread's ptid given its associated INFO. */
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static ptid_t
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ptid_build_from_info (struct dec_thread_info info)
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{
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int pid = ptid_get_pid (inferior_ptid);
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return ptid_build (pid, 0, (long) info.thread);
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}
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/* Return non-zero if PTID is still alive.
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Assumes that DEC_THREAD_LIST is up to date. */
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static int
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dec_thread_ptid_is_alive (ptid_t ptid)
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{
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pthreadDebugId_t tid = ptid_get_tid (ptid);
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int i;
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struct dec_thread_info *info;
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if (tid == 0)
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/* This is the thread corresponding to the process. This ptid
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is always alive until the program exits. */
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return 1;
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/* Search whether an entry with the same tid exists in the dec-thread
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list of threads. If it does, then the thread is still alive.
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No match found means that the thread must be dead, now. */
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for (i = 0; VEC_iterate (dec_thread_info_s, dec_thread_list, i, info); i++)
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if (info->thread == tid)
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return 1;
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return 0;
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}
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/* Recompute the list of user threads and store the result in
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DEC_THREAD_LIST. */
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static void
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update_dec_thread_list (void)
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{
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pthreadDebugId_t thread;
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pthreadDebugThreadInfo_t info;
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int res;
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free_dec_thread_info_vec (&dec_thread_list);
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res = pthreadDebugThdSeqInit (debug_context, &thread);
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while (res == ESUCCESS)
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{
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res = pthreadDebugThdGetInfo (debug_context, thread, &info);
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if (res != ESUCCESS)
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warning (_("unable to get thread info, ignoring thread %ld"),
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thread);
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else if (info.kind == PTHREAD_DEBUG_THD_KIND_INITIAL
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|| info.kind == PTHREAD_DEBUG_THD_KIND_NORMAL)
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{
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struct dec_thread_info *item =
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xmalloc (sizeof (struct dec_thread_info));
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item->thread = thread;
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item->info = info;
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VEC_safe_push (dec_thread_info_s, dec_thread_list, item);
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}
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res = pthreadDebugThdSeqNext (debug_context, &thread);
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}
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pthreadDebugThdSeqDestroy (debug_context);
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}
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/* Implement the update_thread_list target_ops method. */
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static void
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dec_thread_update_thread_list (struct target_ops *ops)
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{
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int i;
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struct dec_thread_info *info;
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struct thread_info *tp, *tmp;
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update_dec_thread_list ();
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/* Delete GDB-side threads no longer found in dec_thread_list. */
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ALL_NON_EXITED_THREADS_SAFE (tp, tmp)
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{
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for (i = 0; VEC_iterate (dec_thread_info_s, dec_thread_list, i, info); i++)
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{
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if (ptid_equal (info->ptid, tp->ptid))
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break;
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}
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if (i == VEC_length (dec_thread_info_s, dec_thread_list))
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{
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/* Not found. */
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delete_thread (tp->ptid);
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}
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}
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/* And now add new threads. */
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for (i = 0; VEC_iterate (dec_thread_info_s, dec_thread_list, i, info); i++)
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{
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ptid_t ptid = ptid_build_from_info (*info);
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if (!in_thread_list (ptid))
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add_thread (ptid);
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}
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}
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/* The "to_detach" method of the dec_thread_ops. */
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static void
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dec_thread_detach (struct target_ops *ops, const char *args, int from_tty)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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debug ("dec_thread_detach");
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disable_dec_thread ();
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beneath->to_detach (beneath, args, from_tty);
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}
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/* Return the ptid of the thread that is currently active. */
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static ptid_t
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get_active_ptid (void)
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{
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int i;
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struct dec_thread_info *info;
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for (i = 0; VEC_iterate (dec_thread_info_s, dec_thread_list, i, info);
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i++)
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if (info->info.state == PTHREAD_DEBUG_STATE_RUNNING)
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return ptid_build_from_info (*info);
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/* No active thread found. This can happen when the program
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has just exited. */
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return null_ptid;
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}
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/* The "to_wait" method of the dec_thread_ops. */
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static ptid_t
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dec_thread_wait (struct target_ops *ops,
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ptid_t ptid, struct target_waitstatus *status, int options)
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{
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ptid_t active_ptid;
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struct target_ops *beneath = find_target_beneath (ops);
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debug ("dec_thread_wait");
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ptid = beneath->to_wait (beneath, ptid, status, options);
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/* The ptid returned by the target beneath us is the ptid of the process.
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We need to find which thread is currently active and return its ptid. */
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dec_thread_update_thread_list (ops);
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active_ptid = get_active_ptid ();
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if (ptid_equal (active_ptid, null_ptid))
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return ptid;
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return active_ptid;
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}
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/* Fetch the general purpose and floating point registers for the given
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thread TID, and store the result in GREGSET and FPREGSET. Return
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zero if successful. */
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static int
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dec_thread_get_regsets (pthreadDebugId_t tid, gdb_gregset_t *gregset,
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gdb_fpregset_t *fpregset)
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{
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int res;
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pthreadDebugRegs_t regs;
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pthreadDebugFregs_t fregs;
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res = pthreadDebugThdGetReg (debug_context, tid, ®s);
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if (res != ESUCCESS)
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{
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debug ("dec_thread_get_regsets: pthreadDebugThdGetReg -> %d", res);
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return -1;
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}
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memcpy (gregset->regs, ®s, sizeof (regs));
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res = pthreadDebugThdGetFreg (debug_context, tid, &fregs);
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if (res != ESUCCESS)
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{
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debug ("dec_thread_get_regsets: pthreadDebugThdGetFreg -> %d", res);
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return -1;
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}
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memcpy (fpregset->regs, &fregs, sizeof (fregs));
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return 0;
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}
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/* The "to_fetch_registers" method of the dec_thread_ops.
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Because the dec-thread debug API doesn't allow us to fetch
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only one register, we simply ignore regno and fetch+supply all
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registers. */
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static void
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dec_thread_fetch_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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pthreadDebugId_t tid = ptid_get_tid (inferior_ptid);
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gregset_t gregset;
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fpregset_t fpregset;
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int res;
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debug ("dec_thread_fetch_registers (tid=%ld, regno=%d)", tid, regno);
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if (tid == 0 || ptid_equal (inferior_ptid, get_active_ptid ()))
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{
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struct target_ops *beneath = find_target_beneath (ops);
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beneath->to_fetch_registers (beneath, regcache, regno);
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return;
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}
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res = dec_thread_get_regsets (tid, &gregset, &fpregset);
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if (res != 0)
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return;
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supply_gregset (regcache, &gregset);
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supply_fpregset (regcache, &fpregset);
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}
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/* Store the registers given in GREGSET and FPREGSET into the associated
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general purpose and floating point registers of thread TID. Return
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zero if successful. */
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static int
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dec_thread_set_regsets (pthreadDebugId_t tid, gdb_gregset_t gregset,
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gdb_fpregset_t fpregset)
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{
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int res;
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pthreadDebugRegs_t regs;
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pthreadDebugFregs_t fregs;
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memcpy (®s, gregset.regs, sizeof (regs));
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res = pthreadDebugThdSetReg (debug_context, tid, ®s);
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if (res != ESUCCESS)
|
|
{
|
|
debug ("dec_thread_set_regsets: pthreadDebugThdSetReg -> %d", res);
|
|
return -1;
|
|
}
|
|
|
|
memcpy (&fregs, fpregset.regs, sizeof (fregs));
|
|
res = pthreadDebugThdSetFreg (debug_context, tid, &fregs);
|
|
if (res != ESUCCESS)
|
|
{
|
|
debug ("dec_thread_set_regsets: pthreadDebugThdSetFreg -> %d", res);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* The "to_store_registers" method of the dec_thread_ops.
|
|
|
|
Because the dec-thread debug API doesn't allow us to store
|
|
just one register, we store all the registers. */
|
|
|
|
static void
|
|
dec_thread_store_registers (struct target_ops *ops,
|
|
struct regcache *regcache, int regno)
|
|
{
|
|
pthreadDebugId_t tid = ptid_get_tid (inferior_ptid);
|
|
gregset_t gregset;
|
|
fpregset_t fpregset;
|
|
int res;
|
|
|
|
debug ("dec_thread_store_registers (tid=%ld, regno=%d)", tid, regno);
|
|
|
|
if (tid == 0 || ptid_equal (inferior_ptid, get_active_ptid ()))
|
|
{
|
|
struct target_ops *beneath = find_target_beneath (ops);
|
|
|
|
beneath->to_store_registers (beneath, regcache, regno);
|
|
return;
|
|
}
|
|
|
|
/* FIXME: brobecker/2008-05-28: I wonder if we could simply check
|
|
in which register set the register is and then only store the
|
|
registers for that register set, instead of storing both register
|
|
sets. */
|
|
fill_gregset (regcache, &gregset, -1);
|
|
fill_fpregset (regcache, &fpregset, -1);
|
|
|
|
res = dec_thread_set_regsets (tid, gregset, fpregset);
|
|
if (res != 0)
|
|
warning (_("failed to store registers."));
|
|
}
|
|
|
|
/* The "to_mourn_inferior" method of the dec_thread_ops. */
|
|
|
|
static void
|
|
dec_thread_mourn_inferior (struct target_ops *ops)
|
|
{
|
|
struct target_ops *beneath = find_target_beneath (ops);
|
|
|
|
debug ("dec_thread_mourn_inferior");
|
|
|
|
disable_dec_thread ();
|
|
beneath->to_mourn_inferior (beneath);
|
|
}
|
|
|
|
/* The "to_thread_alive" method of the dec_thread_ops. */
|
|
static int
|
|
dec_thread_thread_alive (struct target_ops *ops, ptid_t ptid)
|
|
{
|
|
debug ("dec_thread_thread_alive (tid=%ld)", ptid_get_tid (ptid));
|
|
|
|
/* The thread list maintained by GDB is up to date, since we update
|
|
it everytime we stop. So check this list. */
|
|
return in_thread_list (ptid);
|
|
}
|
|
|
|
/* The "to_pid_to_str" method of the dec_thread_ops. */
|
|
|
|
static char *
|
|
dec_thread_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
|
{
|
|
static char *ret = NULL;
|
|
|
|
if (ptid_get_tid (ptid) == 0)
|
|
{
|
|
struct target_ops *beneath = find_target_beneath (ops);
|
|
|
|
return beneath->to_pid_to_str (beneath, ptid);
|
|
}
|
|
|
|
/* Free previous return value; a new one will be allocated by
|
|
xstrprintf(). */
|
|
xfree (ret);
|
|
|
|
ret = xstrprintf (_("Thread %ld"), ptid_get_tid (ptid));
|
|
return ret;
|
|
}
|
|
|
|
/* A "new-objfile" observer. Used to activate/deactivate dec-thread
|
|
support. */
|
|
|
|
static void
|
|
dec_thread_new_objfile_observer (struct objfile *objfile)
|
|
{
|
|
if (objfile != NULL)
|
|
enable_dec_thread ();
|
|
else
|
|
disable_dec_thread ();
|
|
}
|
|
|
|
/* The "to_get_ada_task_ptid" method of the dec_thread_ops. */
|
|
|
|
static ptid_t
|
|
dec_thread_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
|
|
{
|
|
int i;
|
|
struct dec_thread_info *info;
|
|
|
|
debug ("dec_thread_get_ada_task_ptid (struct target_ops *self,"
|
|
" lwp=0x%lx, thread=0x%lx)",
|
|
lwp, thread);
|
|
|
|
for (i = 0; VEC_iterate (dec_thread_info_s, dec_thread_list, i, info);
|
|
i++)
|
|
if (info->info.teb == (pthread_t) thread)
|
|
return ptid_build_from_info (*info);
|
|
|
|
warning (_("Could not find thread id from THREAD = 0x%lx"), thread);
|
|
return inferior_ptid;
|
|
}
|
|
|
|
static void
|
|
init_dec_thread_ops (void)
|
|
{
|
|
dec_thread_ops.to_shortname = "dec-threads";
|
|
dec_thread_ops.to_longname = _("DEC threads support");
|
|
dec_thread_ops.to_doc = _("DEC threads support");
|
|
dec_thread_ops.to_detach = dec_thread_detach;
|
|
dec_thread_ops.to_wait = dec_thread_wait;
|
|
dec_thread_ops.to_fetch_registers = dec_thread_fetch_registers;
|
|
dec_thread_ops.to_store_registers = dec_thread_store_registers;
|
|
dec_thread_ops.to_mourn_inferior = dec_thread_mourn_inferior;
|
|
dec_thread_ops.to_thread_alive = dec_thread_thread_alive;
|
|
dec_thread_ops.to_update_thread_list = dec_thread_update_thread_list;
|
|
dec_thread_ops.to_pid_to_str = dec_thread_pid_to_str;
|
|
dec_thread_ops.to_stratum = thread_stratum;
|
|
dec_thread_ops.to_get_ada_task_ptid = dec_thread_get_ada_task_ptid;
|
|
dec_thread_ops.to_magic = OPS_MAGIC;
|
|
}
|
|
|
|
void
|
|
_initialize_dec_thread (void)
|
|
{
|
|
init_dec_thread_ops ();
|
|
complete_target_initialization (&dec_thread_ops);
|
|
|
|
observer_attach_new_objfile (dec_thread_new_objfile_observer);
|
|
|
|
add_setshow_boolean_cmd ("dec-thread", class_maintenance, &debug_dec_thread,
|
|
_("Set debugging of DEC threads module."),
|
|
_("Show debugging of DEC threads module."),
|
|
_("Enables debugging output (used to debug GDB)."),
|
|
NULL, NULL,
|
|
&setdebuglist, &showdebuglist);
|
|
}
|