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/* GNU/Linux on ARM native support.

   Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006, 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 "inferior.h"

#include "gdbcore.h"

#include "gdb_string.h"

#include "regcache.h"

#include "target.h"

#include "linux-nat.h"

#include "target-descriptions.h"

#include "arm-tdep.h"

#include "arm-linux-tdep.h"

#include <sys/user.h>

#include <sys/ptrace.h>

#include <sys/utsname.h>

#include <sys/procfs.h>

/* Prototypes for supply_gregset etc. */

#include "gregset.h"

/* Defines ps_err_e, struct ps_prochandle.  */

#include "gdb_proc_service.h"

#include "features/arm-with-iwmmxt.c"

#ifndef PTRACE_GET_THREAD_AREA

#define PTRACE_GET_THREAD_AREA 22

#endif

#ifndef PTRACE_GETWMMXREGS

#define PTRACE_GETWMMXREGS 18

#define PTRACE_SETWMMXREGS 19

#endif

/* A flag for whether the WMMX registers are available.  */

static int arm_linux_has_wmmx_registers;

extern int arm_apcs_32;

/* The following variables are used to determine the version of the

   underlying GNU/Linux operating system.  Examples:

   GNU/Linux 2.0.35             GNU/Linux 2.2.12

   os_version = 0x00020023      os_version = 0x0002020c

   os_major = 2                 os_major = 2

   os_minor = 0                 os_minor = 2

   os_release = 35              os_release = 12

   Note: os_version = (os_major << 16) | (os_minor << 8) | os_release

   These are initialized using get_linux_version() from

   _initialize_arm_linux_nat().  */

static unsigned int os_version, os_major, os_minor, os_release;

/* On GNU/Linux, threads are implemented as pseudo-processes, in which

   case we may be tracing more than one process at a time.  In that

   case, inferior_ptid will contain the main process ID and the

   individual thread (process) ID.  get_thread_id () is used to get

   the thread id if it's available, and the process id otherwise.  */

int

get_thread_id (ptid_t ptid)

{

  int tid = TIDGET (ptid);

  if (0 == tid)

    tid = PIDGET (ptid);

  return tid;

}

#define GET_THREAD_ID(PTID)     get_thread_id (PTID)

/* Get the value of a particular register from the floating point

   state of the process and store it into regcache.  */

static void

fetch_fpregister (struct regcache *regcache, int regno)

{

  int ret, tid;

  gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  /* Read the floating point state.  */

  ret = ptrace (PT_GETFPREGS, tid, 0, fp);

  if (ret < 0)

    {

      warning (_("Unable to fetch floating point register."));

      return;

    }

  /* Fetch fpsr.  */

  if (ARM_FPS_REGNUM == regno)

    regcache_raw_supply (regcache, ARM_FPS_REGNUM,

                         fp + NWFPE_FPSR_OFFSET);

  /* Fetch the floating point register.  */

  if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)

    supply_nwfpe_register (regcache, regno, fp);

}

/* Get the whole floating point state of the process and store it

   into regcache.  */

static void

fetch_fpregs (struct regcache *regcache)

{

  int ret, regno, tid;

  gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  /* Read the floating point state.  */

  ret = ptrace (PT_GETFPREGS, tid, 0, fp);

  if (ret < 0)

    {

      warning (_("Unable to fetch the floating point registers."));

      return;

    }

  /* Fetch fpsr.  */

  regcache_raw_supply (regcache, ARM_FPS_REGNUM,

                       fp + NWFPE_FPSR_OFFSET);

  /* Fetch the floating point registers.  */

  for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)

    supply_nwfpe_register (regcache, regno, fp);

}

/* Save a particular register into the floating point state of the

   process using the contents from regcache.  */

static void

store_fpregister (const struct regcache *regcache, int regno)

{

  int ret, tid;

  gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  /* Read the floating point state.  */

  ret = ptrace (PT_GETFPREGS, tid, 0, fp);

  if (ret < 0)

    {

      warning (_("Unable to fetch the floating point registers."));

      return;

    }

  /* Store fpsr.  */

  if (ARM_FPS_REGNUM == regno && regcache_valid_p (regcache, ARM_FPS_REGNUM))

    regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);

  /* Store the floating point register.  */

  if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)

    collect_nwfpe_register (regcache, regno, fp);

  ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);

  if (ret < 0)

    {

      warning (_("Unable to store floating point register."));

      return;

    }

}

/* Save the whole floating point state of the process using

   the contents from regcache.  */

static void

store_fpregs (const struct regcache *regcache)

{

  int ret, regno, tid;

  gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  /* Read the floating point state.  */

  ret = ptrace (PT_GETFPREGS, tid, 0, fp);

  if (ret < 0)

    {

      warning (_("Unable to fetch the floating point registers."));

      return;

    }

  /* Store fpsr.  */

  if (regcache_valid_p (regcache, ARM_FPS_REGNUM))

    regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);

  /* Store the floating point registers.  */

  for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)

    if (regcache_valid_p (regcache, regno))

      collect_nwfpe_register (regcache, regno, fp);

  ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);

  if (ret < 0)

    {

      warning (_("Unable to store floating point registers."));

      return;

    }

}

/* Fetch a general register of the process and store into

   regcache.  */

static void

fetch_register (struct regcache *regcache, int regno)

{

  int ret, tid;

  elf_gregset_t regs;

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);

  if (ret < 0)

    {

      warning (_("Unable to fetch general register."));

      return;

    }

  if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM)

    regcache_raw_supply (regcache, regno, (char *) &regs[regno]);

  if (ARM_PS_REGNUM == regno)

    {

      if (arm_apcs_32)

        regcache_raw_supply (regcache, ARM_PS_REGNUM,

                             (char *) &regs[ARM_CPSR_GREGNUM]);

      else

        regcache_raw_supply (regcache, ARM_PS_REGNUM,

                             (char *) &regs[ARM_PC_REGNUM]);

    }

  if (ARM_PC_REGNUM == regno)

    {

      regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove

                              (get_regcache_arch (regcache),

                               regs[ARM_PC_REGNUM]);

      regcache_raw_supply (regcache, ARM_PC_REGNUM,

                           (char *) &regs[ARM_PC_REGNUM]);

    }

}

/* Fetch all general registers of the process and store into

   regcache.  */

static void

fetch_regs (struct regcache *regcache)

{

  int ret, regno, tid;

  elf_gregset_t regs;

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);

  if (ret < 0)

    {

      warning (_("Unable to fetch general registers."));

      return;

    }

  for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)

    regcache_raw_supply (regcache, regno, (char *) &regs[regno]);

  if (arm_apcs_32)

    regcache_raw_supply (regcache, ARM_PS_REGNUM,

                         (char *) &regs[ARM_CPSR_GREGNUM]);

  else

    regcache_raw_supply (regcache, ARM_PS_REGNUM,

                         (char *) &regs[ARM_PC_REGNUM]);

  regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove

                          (get_regcache_arch (regcache), regs[ARM_PC_REGNUM]);

  regcache_raw_supply (regcache, ARM_PC_REGNUM,

                       (char *) &regs[ARM_PC_REGNUM]);

}

/* Store all general registers of the process from the values in

   regcache.  */

static void

store_register (const struct regcache *regcache, int regno)

{

  int ret, tid;

  elf_gregset_t regs;

  if (!regcache_valid_p (regcache, regno))

    return;

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  /* Get the general registers from the process.  */

  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);

  if (ret < 0)

    {

      warning (_("Unable to fetch general registers."));

      return;

    }

  if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM)

    regcache_raw_collect (regcache, regno, (char *) &regs[regno]);

  else if (arm_apcs_32 && regno == ARM_PS_REGNUM)

    regcache_raw_collect (regcache, regno,

                         (char *) &regs[ARM_CPSR_GREGNUM]);

  else if (!arm_apcs_32 && regno == ARM_PS_REGNUM)

    regcache_raw_collect (regcache, ARM_PC_REGNUM,

                         (char *) &regs[ARM_PC_REGNUM]);

  ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);

  if (ret < 0)

    {

      warning (_("Unable to store general register."));

      return;

    }

}

static void

store_regs (const struct regcache *regcache)

{

  int ret, regno, tid;

  elf_gregset_t regs;

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  /* Fetch the general registers.  */

  ret = ptrace (PTRACE_GETREGS, tid, 0, &regs);

  if (ret < 0)

    {

      warning (_("Unable to fetch general registers."));

      return;

    }

  for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)

    {

      if (regcache_valid_p (regcache, regno))

        regcache_raw_collect (regcache, regno, (char *) &regs[regno]);

    }

  if (arm_apcs_32 && regcache_valid_p (regcache, ARM_PS_REGNUM))

    regcache_raw_collect (regcache, ARM_PS_REGNUM,

                         (char *) &regs[ARM_CPSR_GREGNUM]);

  ret = ptrace (PTRACE_SETREGS, tid, 0, &regs);

  if (ret < 0)

    {

      warning (_("Unable to store general registers."));

      return;

    }

}

/* Fetch all WMMX registers of the process and store into

   regcache.  */

#define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4)

static void

fetch_wmmx_regs (struct regcache *regcache)

{

  char regbuf[IWMMXT_REGS_SIZE];

  int ret, regno, tid;

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);

  if (ret < 0)

    {

      warning (_("Unable to fetch WMMX registers."));

      return;

    }

  for (regno = 0; regno < 16; regno++)

    regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM,

                         &regbuf[regno * 8]);

  for (regno = 0; regno < 2; regno++)

    regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM,

                         &regbuf[16 * 8 + regno * 4]);

  for (regno = 0; regno < 4; regno++)

    regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM,

                         &regbuf[16 * 8 + 2 * 4 + regno * 4]);

}

static void

store_wmmx_regs (const struct regcache *regcache)

{

  char regbuf[IWMMXT_REGS_SIZE];

  int ret, regno, tid;

  /* Get the thread id for the ptrace call.  */

  tid = GET_THREAD_ID (inferior_ptid);

  ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);

  if (ret < 0)

    {

      warning (_("Unable to fetch WMMX registers."));

      return;

    }

  for (regno = 0; regno < 16; regno++)

    if (regcache_valid_p (regcache, regno + ARM_WR0_REGNUM))

      regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM,

                            &regbuf[regno * 8]);

  for (regno = 0; regno < 2; regno++)

    if (regcache_valid_p (regcache, regno + ARM_WCSSF_REGNUM))

      regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM,

                            &regbuf[16 * 8 + regno * 4]);

  for (regno = 0; regno < 4; regno++)

    if (regcache_valid_p (regcache, regno + ARM_WCGR0_REGNUM))

      regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM,

                            &regbuf[16 * 8 + 2 * 4 + regno * 4]);

  ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf);

  if (ret < 0)

    {

      warning (_("Unable to store WMMX registers."));

      return;

    }

}

/* Fetch registers from the child process.  Fetch all registers if

   regno == -1, otherwise fetch all general registers or all floating

   point registers depending upon the value of regno.  */

static void

arm_linux_fetch_inferior_registers (struct target_ops *ops,

                                    struct regcache *regcache, int regno)

{

  if (-1 == regno)

    {

      fetch_regs (regcache);

      fetch_fpregs (regcache);

      if (arm_linux_has_wmmx_registers)

        fetch_wmmx_regs (regcache);

    }

  else

    {

      if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)

        fetch_register (regcache, regno);

      else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM)

        fetch_fpregister (regcache, regno);

      else if (arm_linux_has_wmmx_registers

               && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)

        fetch_wmmx_regs (regcache);

    }

}

/* Store registers back into the inferior.  Store all registers if

   regno == -1, otherwise store all general registers or all floating

   point registers depending upon the value of regno.  */

static void

arm_linux_store_inferior_registers (struct target_ops *ops,

                                    struct regcache *regcache, int regno)

{

  if (-1 == regno)

    {

      store_regs (regcache);

      store_fpregs (regcache);

      if (arm_linux_has_wmmx_registers)

        store_wmmx_regs (regcache);

    }

  else

    {

      if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)

        store_register (regcache, regno);

      else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM))

        store_fpregister (regcache, regno);

      else if (arm_linux_has_wmmx_registers

               && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)

        store_wmmx_regs (regcache);

    }

}

/* Wrapper functions for the standard regset handling, used by

   thread debugging.  */

void

fill_gregset (const struct regcache *regcache,

              gdb_gregset_t *gregsetp, int regno)

{

  arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0);

}

void

supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)

{

  arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0);

}

void

fill_fpregset (const struct regcache *regcache,

               gdb_fpregset_t *fpregsetp, int regno)

{

  arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0);

}

/* Fill GDB's register array with the floating-point register values

   in *fpregsetp.  */

void

supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)

{

  arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0);

}

/* Fetch the thread-local storage pointer for libthread_db.  */

ps_err_e

ps_get_thread_area (const struct ps_prochandle *ph,

                    lwpid_t lwpid, int idx, void **base)

{

  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)

    return PS_ERR;

  /* IDX is the bias from the thread pointer to the beginning of the

     thread descriptor.  It has to be subtracted due to implementation

     quirks in libthread_db.  */

  *base = (void *) ((char *)*base - idx);

  return PS_OK;

}

static unsigned int

get_linux_version (unsigned int *vmajor,

                   unsigned int *vminor,

                   unsigned int *vrelease)

{

  struct utsname info;

  char *pmajor, *pminor, *prelease, *tail;

  if (-1 == uname (&info))

    {

      warning (_("Unable to determine GNU/Linux version."));

      return -1;

    }

  pmajor = strtok (info.release, ".");

  pminor = strtok (NULL, ".");

  prelease = strtok (NULL, ".");

  *vmajor = (unsigned int) strtoul (pmajor, &tail, 0);

  *vminor = (unsigned int) strtoul (pminor, &tail, 0);

  *vrelease = (unsigned int) strtoul (prelease, &tail, 0);

  return ((*vmajor << 16) | (*vminor << 8) | *vrelease);

}

static const struct target_desc *

arm_linux_read_description (struct target_ops *ops)

{

  int ret;

  char regbuf[IWMMXT_REGS_SIZE];

  ret = ptrace (PTRACE_GETWMMXREGS, GET_THREAD_ID (inferior_ptid),

                0, regbuf);

  if (ret < 0)

    arm_linux_has_wmmx_registers = 0;

  else

    arm_linux_has_wmmx_registers = 1;

  if (arm_linux_has_wmmx_registers)

    return tdesc_arm_with_iwmmxt;

  else

    return NULL;

}

void _initialize_arm_linux_nat (void);

void

_initialize_arm_linux_nat (void)

{

  struct target_ops *t;

  os_version = get_linux_version (&os_major, &os_minor, &os_release);

  /* Fill in the generic GNU/Linux methods.  */

  t = linux_target ();

  /* Add our register access methods.  */

  t->to_fetch_registers = arm_linux_fetch_inferior_registers;

  t->to_store_registers = arm_linux_store_inferior_registers;

  t->to_read_description = arm_linux_read_description;

  /* Register the target.  */

  linux_nat_add_target (t);

  /* Initialize the standard target descriptions.  */

  initialize_tdesc_arm_with_iwmmxt ();

}