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/* GNU/Linux/PowerPC64 specific low level interface, for the remote server for

   GDB.

   Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 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 "server.h"

#include "linux-low.h"

#include <asm/ptrace.h>

#define ppc_num_regs 71

/* We use a constant for FPSCR instead of PT_FPSCR, because

   many shipped PPC64 kernels had the wrong value in ptrace.h.  */

static int ppc_regmap[] =

 {PT_R0 * 8,     PT_R1 * 8,     PT_R2 * 8,     PT_R3 * 8,

  PT_R4 * 8,     PT_R5 * 8,     PT_R6 * 8,     PT_R7 * 8,

  PT_R8 * 8,     PT_R9 * 8,     PT_R10 * 8,    PT_R11 * 8,

  PT_R12 * 8,    PT_R13 * 8,    PT_R14 * 8,    PT_R15 * 8,

  PT_R16 * 8,    PT_R17 * 8,    PT_R18 * 8,    PT_R19 * 8,

  PT_R20 * 8,    PT_R21 * 8,    PT_R22 * 8,    PT_R23 * 8,

  PT_R24 * 8,    PT_R25 * 8,    PT_R26 * 8,    PT_R27 * 8,

  PT_R28 * 8,    PT_R29 * 8,    PT_R30 * 8,    PT_R31 * 8,

  PT_FPR0*8,     PT_FPR0*8 + 8, PT_FPR0*8+16,  PT_FPR0*8+24,

  PT_FPR0*8+32,  PT_FPR0*8+40,  PT_FPR0*8+48,  PT_FPR0*8+56,

  PT_FPR0*8+64,  PT_FPR0*8+72,  PT_FPR0*8+80,  PT_FPR0*8+88,

  PT_FPR0*8+96,  PT_FPR0*8+104,  PT_FPR0*8+112,  PT_FPR0*8+120,

  PT_FPR0*8+128, PT_FPR0*8+136,  PT_FPR0*8+144,  PT_FPR0*8+152,

  PT_FPR0*8+160,  PT_FPR0*8+168,  PT_FPR0*8+176,  PT_FPR0*8+184,

  PT_FPR0*8+192,  PT_FPR0*8+200,  PT_FPR0*8+208,  PT_FPR0*8+216,

  PT_FPR0*8+224,  PT_FPR0*8+232,  PT_FPR0*8+240,  PT_FPR0*8+248,

  PT_NIP * 8,    PT_MSR * 8,    PT_CCR * 8,    PT_LNK * 8,

  PT_CTR * 8,    PT_XER * 8,    PT_FPR0*8 + 256 };

static int

ppc_cannot_store_register (int regno)

{

  return 0;

}

static int

ppc_cannot_fetch_register (int regno)

{

  return 0;

}

static CORE_ADDR

ppc_get_pc (void)

{

  unsigned long pc;

  collect_register_by_name ("pc", &pc);

  return (CORE_ADDR) pc;

}

static void

ppc_set_pc (CORE_ADDR pc)

{

  unsigned long newpc = pc;

  supply_register_by_name ("pc", &newpc);

}

/* Correct in either endianness.

   This instruction is "twge r2, r2", which GDB uses as a software

   breakpoint.  */

static const unsigned int ppc_breakpoint = 0x7d821008;

#define ppc_breakpoint_len 4

static int

ppc_breakpoint_at (CORE_ADDR where)

{

  unsigned int insn;

  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);

  if (insn == ppc_breakpoint)

    return 1;

  /* If necessary, recognize more trap instructions here.  GDB only uses the

     one.  */

  return 0;

}

/* Provide only a fill function for the general register set.  ps_lgetregs

   will use this for NPTL support.  */

static void ppc_fill_gregset (void *buf)

{

  int i;

  for (i = 0; i < 32; i++)

    collect_register (i, (char *) buf + ppc_regmap[i]);

  for (i = 64; i < 70; i++)

    collect_register (i, (char *) buf + ppc_regmap[i]);

}

#ifdef __ALTIVEC__

#ifndef PTRACE_GETVRREGS

#define PTRACE_GETVRREGS 18

#define PTRACE_SETVRREGS 19

#endif

#define SIZEOF_VRREGS 33*16+4

static void

ppc_fill_vrregset (void *buf)

{

  int i, base;

  char *regset = buf;

  base = find_regno ("vr0");

  for (i = 0; i < 32; i++)

    collect_register (base + i, &regset[i * 16]);

  collect_register_by_name ("vscr", &regset[32 * 16 + 12]);

  collect_register_by_name ("vrsave", &regset[33 * 16]);

}

static void

ppc_store_vrregset (const void *buf)

{

  int i, base;

  const char *regset = buf;

  base = find_regno ("vr0");

  for (i = 0; i < 32; i++)

    supply_register (base + i, &regset[i * 16]);

  supply_register_by_name ("vscr", &regset[32 * 16 + 12]);

  supply_register_by_name ("vrsave", &regset[33 * 16]);

}

#endif /* __ALTIVEC__ */

struct regset_info target_regsets[] = {

  /* List the extra register sets before GENERAL_REGS.  That way we will

     fetch them every time, but still fall back to PTRACE_PEEKUSER for the

     general registers.  Some kernels support these, but not the newer

     PPC_PTRACE_GETREGS.  */

#ifdef __ALTIVEC__

  { PTRACE_GETVRREGS, PTRACE_SETVRREGS, SIZEOF_VRREGS, EXTENDED_REGS,

    ppc_fill_vrregset, ppc_store_vrregset },

#endif

  { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },

  { 0, 0, -1, -1, NULL, NULL }

};

struct linux_target_ops the_low_target = {

  ppc_num_regs,

  ppc_regmap,

  ppc_cannot_fetch_register,

  ppc_cannot_store_register,

  ppc_get_pc,

  ppc_set_pc,

  (const unsigned char *) &ppc_breakpoint,

  ppc_breakpoint_len,

  NULL,

  0,

  ppc_breakpoint_at,

  NULL,

  NULL,

  NULL,

  NULL,

  1

};