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/* Low level DECstation interface to ptrace, for GDB when running native.

   Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1999, 2000, 2001

   Free Software Foundation, Inc.

   Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU

   and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.

   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 "defs.h"

#include "inferior.h"

#include "gdbcore.h"

#include "regcache.h"

#include <sys/ptrace.h>

#include <sys/types.h>

#include <sys/param.h>

#include <sys/user.h>

#undef JB_S0

#undef JB_S1

#undef JB_S2

#undef JB_S3

#undef JB_S4

#undef JB_S5

#undef JB_S6

#undef JB_S7

#undef JB_SP

#undef JB_S8

#undef JB_PC

#undef JB_SR

#undef NJBREGS

#include <setjmp.h>             /* For JB_XXX.  */

/* Size of elements in jmpbuf */

#define JB_ELEMENT_SIZE 4

/* Map gdb internal register number to ptrace ``address''.

   These ``addresses'' are defined in DECstation <sys/ptrace.h> */

#define REGISTER_PTRACE_ADDR(regno) \

   (regno < 32 ?                GPR_BASE + regno \

  : regno == PC_REGNUM ?        PC      \

  : regno == CAUSE_REGNUM ?     CAUSE   \

  : regno == HI_REGNUM ?        MMHI    \

  : regno == LO_REGNUM ?        MMLO    \

  : regno == FCRCS_REGNUM ?     FPC_CSR \

  : regno == FCRIR_REGNUM ?     FPC_EIR \

  : regno >= FP0_REGNUM ?       FPR_BASE + (regno - FP0_REGNUM) \

  : 0)

static char zerobuf[MAX_REGISTER_RAW_SIZE] =

{0};

static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);

/* Get all registers from the inferior */

void

fetch_inferior_registers (int regno)

{

  register unsigned int regaddr;

  char buf[MAX_REGISTER_RAW_SIZE];

  register int i;

  registers_fetched ();

  for (regno = 1; regno < NUM_REGS; regno++)

    {

      regaddr = REGISTER_PTRACE_ADDR (regno);

      for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))

        {

          *(int *) &buf[i] = ptrace (PT_READ_U, PIDGET (inferior_ptid),

                                     (PTRACE_ARG3_TYPE) regaddr, 0);

          regaddr += sizeof (int);

        }

      supply_register (regno, buf);

    }

  supply_register (ZERO_REGNUM, zerobuf);

  /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */

  supply_register (FP_REGNUM, zerobuf);

}

/* Store our register values back into the inferior.

   If REGNO is -1, do this for all registers.

   Otherwise, REGNO specifies which register (so we can save time).  */

void

store_inferior_registers (int regno)

{

  register unsigned int regaddr;

  char buf[80];

  if (regno > 0)

    {

      if (regno == ZERO_REGNUM || regno == PS_REGNUM

          || regno == BADVADDR_REGNUM || regno == CAUSE_REGNUM

          || regno == FCRIR_REGNUM || regno == FP_REGNUM

          || (regno >= FIRST_EMBED_REGNUM && regno <= LAST_EMBED_REGNUM))

        return;

      regaddr = REGISTER_PTRACE_ADDR (regno);

      errno = 0;

      ptrace (PT_WRITE_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) regaddr,

              read_register (regno));

      if (errno != 0)

        {

          sprintf (buf, "writing register number %d", regno);

          perror_with_name (buf);

        }

    }

  else

    {

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

        store_inferior_registers (regno);

    }

}

/* Figure out where the longjmp will land.

   We expect the first arg to be a pointer to the jmp_buf structure from which

   we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.

   This routine returns true on success. */

int

get_longjmp_target (CORE_ADDR *pc)

{

  CORE_ADDR jb_addr;

  char *buf;

  buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);

  jb_addr = read_register (A0_REGNUM);

  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,

                          TARGET_PTR_BIT / TARGET_CHAR_BIT))

    return 0;

  *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);

  return 1;

}

/* Extract the register values out of the core file and store

   them where `read_register' will find them.

   CORE_REG_SECT points to the register values themselves, read into memory.

   CORE_REG_SIZE is the size of that area.

   WHICH says which set of registers we are handling (0 = int, 2 = float

   on machines where they are discontiguous).

   REG_ADDR is the offset from u.u_ar0 to the register values relative to

   core_reg_sect.  This is used with old-fashioned core files to

   locate the registers in a large upage-plus-stack ".reg" section.

   Original upage address X is at location core_reg_sect+x+reg_addr.

 */

static void

fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,

                      CORE_ADDR reg_addr)

{

  register int regno;

  register unsigned int addr;

  int bad_reg = -1;

  register reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */

  /* If u.u_ar0 was an absolute address in the core file, relativize it now,

     so we can use it as an offset into core_reg_sect.  When we're done,

     "register 0" will be at core_reg_sect+reg_ptr, and we can use

     register_addr to offset to the other registers.  If this is a modern

     core file without a upage, reg_ptr will be zero and this is all a big

     NOP.  */

  if (reg_ptr > core_reg_size)

#ifdef KERNEL_U_ADDR

    reg_ptr -= KERNEL_U_ADDR;

#else

    error ("Old mips core file can't be processed on this machine.");

#endif

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

    {

      addr = register_addr (regno, reg_ptr);

      if (addr >= core_reg_size)

        {

          if (bad_reg < 0)

            bad_reg = regno;

        }

      else

        {

          supply_register (regno, core_reg_sect + addr);

        }

    }

  if (bad_reg >= 0)

    {

      error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));

    }

  supply_register (ZERO_REGNUM, zerobuf);

  /* Frame ptr reg must appear to be 0; it is faked by stack handling code. */

  supply_register (FP_REGNUM, zerobuf);

}

/* Return the address in the core dump or inferior of register REGNO.

   BLOCKEND is the address of the end of the user structure.  */

CORE_ADDR

register_addr (int regno, CORE_ADDR blockend)

{

  CORE_ADDR addr;

  if (regno < 0 || regno >= NUM_REGS)

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

  REGISTER_U_ADDR (addr, blockend, regno);

  return addr;

}

/* Register that we are able to handle mips core file formats.

   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns mips_core_fns =

{

  bfd_target_unknown_flavour,           /* core_flavour */

  default_check_format,                 /* check_format */

  default_core_sniffer,                 /* core_sniffer */

  fetch_core_registers,                 /* core_read_registers */

  NULL                                  /* next */

};

void

_initialize_core_mips (void)

{

  add_core_fns (&mips_core_fns);

}