proc-service.c

这个是LINUX下的GDB调度工具的源码

/* libthread_db helper functions for the remote server for GDB.
   Copyright 2002, 2004
   Free Software Foundation, Inc.

   Contributed by MontaVista Software.

   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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "server.h"

/* This file is currently tied to GNU/Linux.  It should scale well to
   another libthread_db implementation, with the approriate gdbserver
   hooks, but for now this means we can use GNU/Linux's target data.  */

#include "linux-low.h"

/* Correct for all GNU/Linux targets (for quite some time).  */
#define GDB_GREGSET_T elf_gregset_t
#define GDB_FPREGSET_T elf_fpregset_t

#ifndef HAVE_ELF_FPREGSET_T
/* Make sure we have said types.  Not all platforms bring in <linux/elf.h>
   via <sys/procfs.h>.  */
#ifdef HAVE_LINUX_ELF_H   
#include <linux/elf.h>    
#endif
#endif

#include "../gdb_proc_service.h"

typedef struct ps_prochandle *gdb_ps_prochandle_t;
typedef void *gdb_ps_read_buf_t;
typedef const void *gdb_ps_write_buf_t;
typedef size_t gdb_ps_size_t;

#ifdef HAVE_LINUX_REGSETS
#define HAVE_REGSETS
#endif

#ifdef HAVE_REGSETS
static struct regset_info *
gregset_info(void)
{
  int i = 0;

  while (target_regsets[i].size != -1)
    {
      if (target_regsets[i].type == GENERAL_REGS)
	break;
      i++;
    }

  return &target_regsets[i];
}
#endif

/* Search for the symbol named NAME within the object named OBJ within
   the target process PH.  If the symbol is found the address of the
   symbol is stored in SYM_ADDR.  */

ps_err_e
ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
		   const char *name, paddr_t *sym_addr)
{
  CORE_ADDR addr;

  if (look_up_one_symbol (name, &addr) == 0)
    return PS_NOSYM;

  *sym_addr = (paddr_t) (unsigned long) addr;
  return PS_OK;
}

/* Read SIZE bytes from the target process PH at address ADDR and copy
   them into BUF.  */

ps_err_e
ps_pdread (gdb_ps_prochandle_t ph, paddr_t addr,
	   gdb_ps_read_buf_t buf, gdb_ps_size_t size)
{
  read_inferior_memory (addr, buf, size);
  return PS_OK;
}

/* Write SIZE bytes from BUF into the target process PH at address ADDR.  */

ps_err_e
ps_pdwrite (gdb_ps_prochandle_t ph, paddr_t addr,
	    gdb_ps_write_buf_t buf, gdb_ps_size_t size)
{
  return write_inferior_memory (addr, buf, size);
}

/* Get the general registers of LWP LWPID within the target process PH
   and store them in GREGSET.  */

ps_err_e
ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
{
#ifdef HAVE_REGSETS
  struct thread_info *reg_inferior, *save_inferior;

  reg_inferior = (struct thread_info *) find_inferior_id (&all_threads,
							  lwpid);
  if (reg_inferior == NULL)
    return PS_ERR;

  save_inferior = current_inferior;
  current_inferior = reg_inferior;

  the_target->fetch_registers (0);
  gregset_info()->fill_function (gregset);

  current_inferior = save_inferior;
  return PS_OK;
#else
  return PS_ERR;
#endif
}

/* Set the general registers of LWP LWPID within the target process PH
   from GREGSET.  */

ps_err_e
ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
{
  /* Unneeded.  */
  return PS_ERR;
}

/* Get the floating-point registers of LWP LWPID within the target
   process PH and store them in FPREGSET.  */

ps_err_e
ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
	       gdb_prfpregset_t *fpregset)
{
  /* Unneeded.  */
  return PS_ERR;
}

/* Set the floating-point registers of LWP LWPID within the target
   process PH from FPREGSET.  */

ps_err_e
ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
	       const gdb_prfpregset_t *fpregset)
{
  /* Unneeded.  */
  return PS_ERR;
}

/* Return overall process id of the target PH.  Special for GNU/Linux
   -- not used on Solaris.  */

pid_t
ps_getpid (gdb_ps_prochandle_t ph)
{
  return ph->pid;
}