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/* Functions specific to running GDB native on HPPA running GNU/Linux.

   Copyright (C) 2004, 2005, 2006, 2007, 2008 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 "regcache.h"

#include "gdb_string.h"

#include "inferior.h"

#include "target.h"

#include "linux-nat.h"

#include <sys/procfs.h>

#include <sys/ptrace.h>

#include <linux/version.h>

#include <asm/ptrace.h>

#include "hppa-linux-offsets.h"

#include "hppa-tdep.h"

/* Prototypes for supply_gregset etc. */

#include "gregset.h"

/* These must match the order of the register names.

   Some sort of lookup table is needed because the offsets associated

   with the registers are all over the board.  */

static const int u_offsets[] =

  {

    /* general registers */

    -1,

    PT_GR1,

    PT_GR2,

    PT_GR3,

    PT_GR4,

    PT_GR5,

    PT_GR6,

    PT_GR7,

    PT_GR8,

    PT_GR9,

    PT_GR10,

    PT_GR11,

    PT_GR12,

    PT_GR13,

    PT_GR14,

    PT_GR15,

    PT_GR16,

    PT_GR17,

    PT_GR18,

    PT_GR19,

    PT_GR20,

    PT_GR21,

    PT_GR22,

    PT_GR23,

    PT_GR24,

    PT_GR25,

    PT_GR26,

    PT_GR27,

    PT_GR28,

    PT_GR29,

    PT_GR30,

    PT_GR31,

    PT_SAR,

    PT_IAOQ0,

    PT_IASQ0,

    PT_IAOQ1,

    PT_IASQ1,

    -1, /* eiem */

    PT_IIR,

    PT_ISR,

    PT_IOR,

    PT_PSW,

    -1, /* goto */

    PT_SR4,

    PT_SR0,

    PT_SR1,

    PT_SR2,

    PT_SR3,

    PT_SR5,

    PT_SR6,

    PT_SR7,

    -1, /* cr0 */

    -1, /* pid0 */

    -1, /* pid1 */

    -1, /* ccr */

    -1, /* pid2 */

    -1, /* pid3 */

    -1, /* cr24 */

    -1, /* cr25 */

    -1, /* cr26 */

    PT_CR27,

    -1, /* cr28 */

    -1, /* cr29 */

    -1, /* cr30 */

    /* Floating point regs.  */

    PT_FR0,  PT_FR0 + 4,

    PT_FR1,  PT_FR1 + 4,

    PT_FR2,  PT_FR2 + 4,

    PT_FR3,  PT_FR3 + 4,

    PT_FR4,  PT_FR4 + 4,

    PT_FR5,  PT_FR5 + 4,

    PT_FR6,  PT_FR6 + 4,

    PT_FR7,  PT_FR7 + 4,

    PT_FR8,  PT_FR8 + 4,

    PT_FR9,  PT_FR9 + 4,

    PT_FR10, PT_FR10 + 4,

    PT_FR11, PT_FR11 + 4,

    PT_FR12, PT_FR12 + 4,

    PT_FR13, PT_FR13 + 4,

    PT_FR14, PT_FR14 + 4,

    PT_FR15, PT_FR15 + 4,

    PT_FR16, PT_FR16 + 4,

    PT_FR17, PT_FR17 + 4,

    PT_FR18, PT_FR18 + 4,

    PT_FR19, PT_FR19 + 4,

    PT_FR20, PT_FR20 + 4,

    PT_FR21, PT_FR21 + 4,

    PT_FR22, PT_FR22 + 4,

    PT_FR23, PT_FR23 + 4,

    PT_FR24, PT_FR24 + 4,

    PT_FR25, PT_FR25 + 4,

    PT_FR26, PT_FR26 + 4,

    PT_FR27, PT_FR27 + 4,

    PT_FR28, PT_FR28 + 4,

    PT_FR29, PT_FR29 + 4,

    PT_FR30, PT_FR30 + 4,

    PT_FR31, PT_FR31 + 4,

  };

static CORE_ADDR

hppa_linux_register_addr (int regno, CORE_ADDR blockend)

{

  CORE_ADDR addr;

  if ((unsigned) regno >= ARRAY_SIZE (u_offsets))

    error (_("Invalid register number %d."), regno);

  if (u_offsets[regno] == -1)

    addr = 0;

  else

    {

      addr = (CORE_ADDR) u_offsets[regno];

    }

  return addr;

}

/*

 * Registers saved in a coredump:

 * gr0..gr31

 * sr0..sr7

 * iaoq0..iaoq1

 * iasq0..iasq1

 * sar, iir, isr, ior, ipsw

 * cr0, cr24..cr31

 * cr8,9,12,13

 * cr10, cr15

 */

#define GR_REGNUM(_n)   (HPPA_R0_REGNUM+_n)

#define TR_REGNUM(_n)   (HPPA_TR0_REGNUM+_n)

static const int greg_map[] =

  {

    GR_REGNUM(0), GR_REGNUM(1), GR_REGNUM(2), GR_REGNUM(3),

    GR_REGNUM(4), GR_REGNUM(5), GR_REGNUM(6), GR_REGNUM(7),

    GR_REGNUM(8), GR_REGNUM(9), GR_REGNUM(10), GR_REGNUM(11),

    GR_REGNUM(12), GR_REGNUM(13), GR_REGNUM(14), GR_REGNUM(15),

    GR_REGNUM(16), GR_REGNUM(17), GR_REGNUM(18), GR_REGNUM(19),

    GR_REGNUM(20), GR_REGNUM(21), GR_REGNUM(22), GR_REGNUM(23),

    GR_REGNUM(24), GR_REGNUM(25), GR_REGNUM(26), GR_REGNUM(27),

    GR_REGNUM(28), GR_REGNUM(29), GR_REGNUM(30), GR_REGNUM(31),

    HPPA_SR4_REGNUM+1, HPPA_SR4_REGNUM+2, HPPA_SR4_REGNUM+3, HPPA_SR4_REGNUM+4,

    HPPA_SR4_REGNUM, HPPA_SR4_REGNUM+5, HPPA_SR4_REGNUM+6, HPPA_SR4_REGNUM+7,

    HPPA_PCOQ_HEAD_REGNUM, HPPA_PCOQ_TAIL_REGNUM,

    HPPA_PCSQ_HEAD_REGNUM, HPPA_PCSQ_TAIL_REGNUM,

    HPPA_SAR_REGNUM, HPPA_IIR_REGNUM, HPPA_ISR_REGNUM, HPPA_IOR_REGNUM,

    HPPA_IPSW_REGNUM, HPPA_RCR_REGNUM,

    TR_REGNUM(0), TR_REGNUM(1), TR_REGNUM(2), TR_REGNUM(3),

    TR_REGNUM(4), TR_REGNUM(5), TR_REGNUM(6), TR_REGNUM(7),

    HPPA_PID0_REGNUM, HPPA_PID1_REGNUM, HPPA_PID2_REGNUM, HPPA_PID3_REGNUM,

    HPPA_CCR_REGNUM, HPPA_EIEM_REGNUM,

  };

/* Fetch one register.  */

static void

fetch_register (struct regcache *regcache, int regno)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  int tid;

  int val;

  if (gdbarch_cannot_fetch_register (gdbarch, regno))

    {

      regcache_raw_supply (regcache, regno, NULL);

      return;

    }

  /* GNU/Linux LWP ID's are process ID's.  */

  tid = TIDGET (inferior_ptid);

  if (tid == 0)

    tid = PIDGET (inferior_ptid); /* Not a threaded program.  */

  errno = 0;

  val = ptrace (PTRACE_PEEKUSER, tid, hppa_linux_register_addr (regno, 0), 0);

  if (errno != 0)

    error (_("Couldn't read register %s (#%d): %s."),

           gdbarch_register_name (gdbarch, regno),

           regno, safe_strerror (errno));

  regcache_raw_supply (regcache, regno, &val);

}

/* Store one register. */

static void

store_register (const struct regcache *regcache, int regno)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  int tid;

  int val;

  if (gdbarch_cannot_store_register (gdbarch, regno))

    return;

  /* GNU/Linux LWP ID's are process ID's.  */

  tid = TIDGET (inferior_ptid);

  if (tid == 0)

    tid = PIDGET (inferior_ptid); /* Not a threaded program.  */

  errno = 0;

  regcache_raw_collect (regcache, regno, &val);

  ptrace (PTRACE_POKEUSER, tid, hppa_linux_register_addr (regno, 0), val);

  if (errno != 0)

    error (_("Couldn't write register %s (#%d): %s."),

           gdbarch_register_name (gdbarch, regno),

           regno, safe_strerror (errno));

}

/* 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

hppa_linux_fetch_inferior_registers (struct regcache *regcache, int regno)

{

  if (-1 == regno)

    {

      for (regno = 0;

           regno < gdbarch_num_regs (get_regcache_arch (regcache));

           regno++)

        fetch_register (regcache, regno);

    }

  else

    {

      fetch_register (regcache, regno);

    }

}

/* 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

hppa_linux_store_inferior_registers (struct regcache *regcache, int regno)

{

  if (-1 == regno)

    {

      for (regno = 0;

           regno < gdbarch_num_regs (get_regcache_arch (regcache));

           regno++)

        store_register (regcache, regno);

    }

  else

    {

      store_register (regcache, regno);

    }

}

/* Fill GDB's register array with the general-purpose register values

   in *gregsetp.  */

void

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

{

  int i;

  const greg_t *regp = (const elf_greg_t *) gregsetp;

  for (i = 0; i < sizeof (greg_map) / sizeof (greg_map[0]); i++, regp++)

    {

      int regno = greg_map[i];

      regcache_raw_supply (regcache, regno, regp);

    }

}

/* Fill register regno (if it is a general-purpose register) in

   *gregsetp with the appropriate value from GDB's register array.

   If regno is -1, do this for all registers.  */

void

fill_gregset (const struct regcache *regcache,

              gdb_gregset_t *gregsetp, int regno)

{

  int i;

  for (i = 0; i < sizeof (greg_map) / sizeof (greg_map[0]); i++)

    {

      int mregno = greg_map[i];

      if (regno == -1 || regno == mregno)

        {

          regcache_raw_collect(regcache, mregno, &(*gregsetp)[i]);

        }

    }

}

/*  Given a pointer to a floating point register set in /proc format

   (fpregset_t *), unpack the register contents and supply them as gdb's

   idea of the current floating point register values. */

void

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

{

  int regi;

  const char *from;

  for (regi = 0; regi <= 31; regi++)

    {

      from = (const char *) &((*fpregsetp)[regi]);

      regcache_raw_supply (regcache, 2*regi + HPPA_FP0_REGNUM, from);

      regcache_raw_supply (regcache, 2*regi + HPPA_FP0_REGNUM + 1, from + 4);

    }

}

/*  Given a pointer to a floating point register set in /proc format

   (fpregset_t *), update the register specified by REGNO from gdb's idea

   of the current floating point register set.  If REGNO is -1, update

   them all. */

void

fill_fpregset (const struct regcache *regcache,

               gdb_fpregset_t *fpregsetp, int regno)

{

  int i;

  for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32 * 2; i++)

   {

      /* Gross.  fpregset_t is double, registers[x] has single

         precision reg.  */

      char *to = (char *) &((*fpregsetp)[(i - HPPA_FP0_REGNUM) / 2]);

      if ((i - HPPA_FP0_REGNUM) & 1)

        to += 4;

      regcache_raw_collect (regcache, i, to);

   }

}

void _initialize_hppa_linux_nat (void);

void

_initialize_hppa_linux_nat (void)

{

  struct target_ops *t;

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

  t = linux_target ();

  /* Add our register access methods.  */

  t->to_fetch_registers = hppa_linux_fetch_inferior_registers;

  t->to_store_registers = hppa_linux_store_inferior_registers;

  /* Register the target.  */

  linux_nat_add_target (t);

}