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/* <proc_service.h> implementation.

   Copyright (C) 1999, 2000, 2002, 2007, 2008, 2009, 2010

   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 "inferior.h"

#include "symtab.h"

#include "target.h"

#include "regcache.h"

#include "gdb_proc_service.h"

#include <sys/procfs.h>

/* Prototypes for supply_gregset etc.  */

#include "gregset.h"

/* Fix-up some broken systems.  */

/* The prototypes in <proc_service.h> are slightly different on older

   systems.  Compensate for the discrepancies.  */

#ifdef PROC_SERVICE_IS_OLD

typedef const struct ps_prochandle *gdb_ps_prochandle_t;

typedef char *gdb_ps_read_buf_t;

typedef char *gdb_ps_write_buf_t;

typedef int gdb_ps_size_t;

#else

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;

#endif

/* Building process ids.  */

#define BUILD_LWP(lwp, pid)     ptid_build (pid, lwp, 0)

/* Helper functions.  */

/* Convert a psaddr_t to a CORE_ADDR.  */

static CORE_ADDR

ps_addr_to_core_addr (psaddr_t addr)

{

  if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))

    return (intptr_t) addr;

  else

    return (uintptr_t) addr;

}

/* Convert a CORE_ADDR to a psaddr_t.  */

static psaddr_t

core_addr_to_ps_addr (CORE_ADDR addr)

{

  if (exec_bfd && bfd_get_sign_extend_vma (exec_bfd))

    return (psaddr_t) (intptr_t) addr;

  else

    return (psaddr_t) (uintptr_t) addr;

}

/* Transfer LEN bytes of memory between BUF and address ADDR in the

   process specified by PH.  If WRITE, transfer them to the process,

   else transfer them from the process.  Returns PS_OK for success,

   PS_ERR on failure.

   This is a helper function for ps_pdread, ps_pdwrite, ps_ptread and

   ps_ptwrite.  */

static ps_err_e

ps_xfer_memory (const struct ps_prochandle *ph, psaddr_t addr,

                gdb_byte *buf, size_t len, int write)

{

  struct cleanup *old_chain = save_inferior_ptid ();

  int ret;

  CORE_ADDR core_addr = ps_addr_to_core_addr (addr);

  inferior_ptid = ph->ptid;

  if (write)

    ret = target_write_memory (core_addr, buf, len);

  else

    ret = target_read_memory (core_addr, buf, len);

  do_cleanups (old_chain);

  return (ret == 0 ? PS_OK : PS_ERR);

}

/* Stop the target process PH.  */

ps_err_e

ps_pstop (gdb_ps_prochandle_t ph)

{

  /* The process is always stopped when under control of GDB.  */

  return PS_OK;

}

/* Resume the target process PH.  */

ps_err_e

ps_pcontinue (gdb_ps_prochandle_t ph)

{

  /* Pretend we did successfully continue the process.  GDB will take

     care of it later on.  */

  return PS_OK;

}

/* Stop the lightweight process LWPID within the target process PH.  */

ps_err_e

ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)

{

  /* All lightweight processes are stopped when under control of GDB.  */

  return PS_OK;

}

/* Resume the lightweight process (LWP) LWPID within the target

   process PH.  */

ps_err_e

ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)

{

  /* Pretend we did successfully continue LWPID.  GDB will take care

     of it later on.  */

  return PS_OK;

}

/* Get the size of the architecture-dependent extra state registers

   for LWP LWPID within the target process PH and return it in

   *XREGSIZE.  */

ps_err_e

ps_lgetxregsize (gdb_ps_prochandle_t ph, lwpid_t lwpid, int *xregsize)

{

  /* FIXME: Not supported yet.  */

  return PS_OK;

}

/* Get the extra state registers of LWP LWPID within the target

   process PH and store them in XREGSET.  */

ps_err_e

ps_lgetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)

{

  /* FIXME: Not supported yet.  */

  return PS_OK;

}

/* Set the extra state registers of LWP LWPID within the target

   process PH from XREGSET.  */

ps_err_e

ps_lsetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)

{

  /* FIXME: Not supported yet.  */

  return PS_OK;

}

/* Log (additional) diognostic information.  */

void

ps_plog (const char *fmt, ...)

{

  va_list args;

  va_start (args, fmt);

  vfprintf_filtered (gdb_stderr, fmt, args);

}

/* 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, psaddr_t *sym_addr)

{

  struct minimal_symbol *ms;

  /* FIXME: kettenis/2000-09-03: What should we do with OBJ?  */

  ms = lookup_minimal_symbol (name, NULL, NULL);

  if (ms == NULL)

    return PS_NOSYM;

  *sym_addr = core_addr_to_ps_addr (SYMBOL_VALUE_ADDRESS (ms));

  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, psaddr_t addr,

           gdb_ps_read_buf_t buf, gdb_ps_size_t size)

{

  return ps_xfer_memory (ph, addr, buf, size, 0);

}

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

ps_err_e

ps_pdwrite (gdb_ps_prochandle_t ph, psaddr_t addr,

            gdb_ps_write_buf_t buf, gdb_ps_size_t size)

{

  return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);

}

/* Read SIZE bytes from the target process PH at address ADDR and copy

   them into BUF.  */

ps_err_e

ps_ptread (gdb_ps_prochandle_t ph, psaddr_t addr,

           gdb_ps_read_buf_t buf, gdb_ps_size_t size)

{

  return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 0);

}

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

ps_err_e

ps_ptwrite (gdb_ps_prochandle_t ph, psaddr_t addr,

            gdb_ps_write_buf_t buf, gdb_ps_size_t size)

{

  return ps_xfer_memory (ph, addr, (gdb_byte *) buf, size, 1);

}

/* 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)

{

  struct cleanup *old_chain = save_inferior_ptid ();

  struct regcache *regcache;

  inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));

  regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);

  target_fetch_registers (regcache, -1);

  fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);

  do_cleanups (old_chain);

  return PS_OK;

}

/* 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)

{

  struct cleanup *old_chain = save_inferior_ptid ();

  struct regcache *regcache;

  inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));

  regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);

  supply_gregset (regcache, (const gdb_gregset_t *) gregset);

  target_store_registers (regcache, -1);

  do_cleanups (old_chain);

  return PS_OK;

}

/* 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)

{

  struct cleanup *old_chain = save_inferior_ptid ();

  struct regcache *regcache;

  inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));

  regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);

  target_fetch_registers (regcache, -1);

  fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);

  do_cleanups (old_chain);

  return PS_OK;

}

/* 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)

{

  struct cleanup *old_chain = save_inferior_ptid ();

  struct regcache *regcache;

  inferior_ptid = BUILD_LWP (lwpid, ptid_get_pid (ph->ptid));

  regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch);

  supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);

  target_store_registers (regcache, -1);

  do_cleanups (old_chain);

  return PS_OK;

}

/* 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 ptid_get_pid (ph->ptid);

}

/* Provide a prototype to silence -Wmissing-prototypes.  */

extern initialize_file_ftype _initialize_proc_service;

void

_initialize_proc_service (void)

{

  /* This function solely exists to make sure this module is linked

     into the final binary.  */

}