/* Native-dependent Motorola 88xxx support for GDB, the GNU Debugger.
   Copyright 1988, 1990, 1991, 1992 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 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 "frame.h"
#include "inferior.h"

#include <machine/reg.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include "gdbcore.h"
#include <sys/user.h>

#ifndef USER			/* added to support BCS ptrace_user */
#define USER user
#endif
#include <sys/ioctl.h>
#include <sys/ptrace.h>
#include <fcntl.h>
#include <sys/file.h>
#include "gdb_stat.h"

#include "symtab.h"
#include "setjmp.h"
#include "value.h"

#ifdef DELTA88
#include <sys/ptrace.h>

struct	user {
	struct	pcb u_pcb;

	struct	sigacts u_sigacts;	/* p_sigacts points here (use it!) */
	struct	pstats u_stats;		/* p_stats points here (use it!) */

	/*
	 * Remaining fields only for core dump and/or ptrace--
	 * not valid at other times!
	 */
	struct	kinfo_proc u_kproc;	/* proc + eproc */
	struct	md_coredump u_md;	/* machine dependent glop */
};

/* define offsets to the pc instruction offsets in ptrace_user struct */
#define SXIP_OFFSET ((char *)&u.pt_sigframe.sig_sxip - (char *)&u)
#define SNIP_OFFSET ((char *)&u.pt_sigframe.sig_snip - (char *)&u)
#define SFIP_OFFSET ((char *)&u.pt_sigframe.sig_sfip - (char *)&u)
#else
/* define offsets to the pc instruction offsets in ptrace_user struct */
#define SXIP_OFFSET ((char *)&u.u_pcb.user_state.sxip - (char *)&u)
#define SNIP_OFFSET ((char *)&u.u_pcb.user_state.snip - (char *)&u)
#define SFIP_OFFSET ((char *)&u.u_pcb.user_state.sfip - (char *)&u)
#endif

extern int have_symbol_file_p();

extern jmp_buf stack_jmp;

extern int errno;
extern char registers[REGISTER_BYTES];

#define PRT2(p)  printf("%s()\n", p)
#define PRT(p)
#if 0
void
fetch_inferior_registers (regno)
     int regno;		/* Original value discarded */
{
  register unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  register int i;

  struct USER u;
  unsigned int offset;

  PRT ("fetch_inferior_registers");
  offset = (char *) &u.u_pcb.user_state.r[0] - (char *) &u; 
  regaddr = offset; /* byte offset to r0;*/

/*  offset = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) - KERNEL_U_ADDR; */
  for (regno = 0; regno < NUM_REGS; regno++)
    {
      /*regaddr = register_addr (regno, offset);*/
	/* 88k enhancement  */
        
      for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 	{
 	  *(int *) &buf[i] = ptrace (3, inferior_pid,
				     (PTRACE_ARG3_TYPE) regaddr, 0);
 	  regaddr += sizeof (int);
 	}
      supply_register (regno, buf);
    }
    /* now load up registers 36 - 38; special pc registers */
    *(int *) &buf[0] = ptrace (3, inferior_pid,
			       (PTRACE_ARG3_TYPE) SXIP_OFFSET ,0);
    supply_register (SXIP_REGNUM, buf);
    *(int *) &buf[0] = ptrace (3, inferior_pid,
			       (PTRACE_ARG3_TYPE) SNIP_OFFSET,0);
    supply_register (SNIP_REGNUM, buf);
    *(int *) &buf[0] = ptrace (3, inferior_pid,
			       (PTRACE_ARG3_TYPE) SFIP_OFFSET,0);
    supply_register (SFIP_REGNUM, buf);
}

/* 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 (regno)
     int regno;
{
  register unsigned int regaddr;
  char buf[80];

  struct USER u;

  unsigned int offset = (char *) &u.u_pcb.user_state.r[0] - (char *) &u;
  PRT ("store_inferior_registers");

  regaddr = offset;

  /* Don't try to deal with EXIP_REGNUM or ENIP_REGNUM, because I think either
     svr3 doesn't run on an 88110, or the kernel isolates the different (not
     completely sure this is true, but seems to be.  */
  if (regno >= 0)
    {
      /*      regaddr = register_addr (regno, offset); */
      if (regno < PC_REGNUM)
	{ 
	  regaddr = offset + regno * sizeof (int);
	  errno = 0;
	  ptrace (6, inferior_pid,
		  (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d", regno);
	      perror_with_name (buf);
	    }
	}
      else if (regno == SXIP_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register(regno));
      else if (regno == SNIP_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register(regno));
      else if (regno == SFIP_REGNUM)
	ptrace (6, inferior_pid,
		(PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register(regno));
      else
	printf_unfiltered ("Bad register number for store_inferior routine\n");
    }
  else
    { 
      for (regno = 0; regno < PC_REGNUM; regno++)
	{
	  /*      regaddr = register_addr (regno, offset); */
	  errno = 0;
	  regaddr = offset + regno * sizeof (int);
	  ptrace (6, inferior_pid,
		  (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d", regno);
	      perror_with_name (buf);
	    }
	}
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) SXIP_OFFSET,read_register(SXIP_REGNUM));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) SNIP_OFFSET,read_register(SNIP_REGNUM));
      ptrace (6, inferior_pid,
	      (PTRACE_ARG3_TYPE) SFIP_OFFSET,read_register(SFIP_REGNUM));
    }
}

#else

void
fetch_inferior_registers (regno)
     int regno;
{
  struct reg inferior_registers;
  struct fpreg inferior_fp_registers;

  PRT2 ("fetch_inferior_registers");

  ptrace (PT_GETREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers,
	  sizeof(inferior_registers));

  ptrace (PT_GETFPREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
  memcpy (&registers[REGISTER_BYTE (sizeof(inferior_registers))], &inferior_fp_registers,
	  sizeof(inferior_fp_registers));
  registers_fetched ();
}

void
store_inferior_registers (regno)
     int regno;
{
  struct reg inferior_registers;
  struct fpreg inferior_fp_registers;
  PRT2 ("store_inferior_registers");

  memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)],
	  sizeof(inferior_registers));
  ptrace (PT_SETREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) &inferior_registers, 0);

  memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (sizeof(inferior_registers))],
	  sizeof(inferior_fp_registers));
  ptrace (PT_SETFPREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0);
}

#endif

/* blockend is the address of the end of the user structure */
m88k_register_u_addr (blockend, regnum)
{
  struct USER u;

  int ustart = blockend - sizeof (struct USER);
  PRT2 ("m88k_register_u_addr");
  switch (regnum)
    {
    case 0:
    case 1:
    case 2:
    case 3:
    case 4:
    case 5:
    case 6:
    case 7:
    case 8:
    case 9:
    case 10:
    case 11:
    case 12:
    case 13:
    case 14:
    case 15:
    case 16:
    case 17:
    case 18:
    case 19:
    case 20:
    case 21:
    case 22:
    case 23:
    case 24:
    case 25:
    case 26:
    case 27:
    case 28:
    case 29:
    case 30:
    case 31:
      return (ustart + ((int) &u.u_pcb.user_state.r[0] - (int) &u) + 
        REGISTER_SIZE * regnum);
    case PSR_REGNUM:  return (ustart + ((int) &u.u_pcb.user_state.epsr - (int) &u));
    case FPSR_REGNUM: return (ustart + ((int) &u.u_pcb.user_state.fpsr - (int) &u));
    case FPCR_REGNUM: return (ustart + ((int) &u.u_pcb.user_state.fpcr - (int) &u));
    case SXIP_REGNUM: return (ustart + ((int) &u.u_pcb.user_state.sxip - (int) &u)); 
    case SNIP_REGNUM: return (ustart + ((int) &u.u_pcb.user_state.snip - (int) &u)); 
    case SFIP_REGNUM: return (ustart + ((int) &u.u_pcb.user_state.sfip - (int) &u)); 
    default: 
	if (regnum < NUM_REGS)
	    /* The register is one of those which is not defined...
	       give it zero */
	    return (ustart + ((int) &u.u_pcb.user_state.r[0] - (int) &u));
	else
	    return (blockend + REGISTER_SIZE * regnum);
    }
}

#ifdef USE_PROC_FS

#include <sys/procfs.h>

/*  Given a pointer to a general register set in /proc format (gregset_t *),
    unpack the register contents and supply them as gdb's idea of the current
    register values. */

void
supply_gregset (gregsetp)
     gregset_t *gregsetp;
{
    register int regi;
    register greg_t *regp = (greg_t *) gregsetp;

    PRT ("supply_gregset");
    for (regi=0; regi <= SP_REGNUM; regi++)
	supply_register (regi, (char *) (regp + regi));

    supply_register (SXIP_REGNUM, (char *) (regp + R_XIP));
    supply_register (SNIP_REGNUM, (char *) (regp + R_NIP));
    supply_register (SFIP_REGNUM, (char *) (regp + R_FIP));
    supply_register (PSR_REGNUM, (char *) (regp + R_PSR));
    supply_register (FPSR_REGNUM, (char *) (regp + R_FPSR));
    supply_register (FPCR_REGNUM, (char *) (regp + R_FPCR));
}

void
fill_gregset (gregsetp, regno)
     gregset_t *gregsetp;
     int regno;
{
    int regi;
    register greg_t *regp = (greg_t *) gregsetp;
    extern char registers[];
    PRT ("fill_gregset");

    for (regi = 0 ; regi <= R_R31 ; regi++)
	if ((regno == -1) || (regno == regi))
	    *(regp + regi) = *(int *) &registers[REGISTER_BYTE(regi)];

    if ((regno == -1) || (regno == SXIP_REGNUM))
	*(regp + R_XIP) = *(int *) &registers[REGISTER_BYTE(SXIP_REGNUM)];
    if ((regno == -1) || (regno == SNIP_REGNUM))
	*(regp + R_NIP) = *(int *) &registers[REGISTER_BYTE(SNIP_REGNUM)];
    if ((regno == -1) || (regno == SFIP_REGNUM))
	*(regp + R_FIP) = *(int *) &registers[REGISTER_BYTE(SFIP_REGNUM)];
    if ((regno == -1) || (regno == PSR_REGNUM))
	*(regp + R_PSR) = *(int *) &registers[REGISTER_BYTE(PSR_REGNUM)];
    if ((regno == -1) || (regno == FPSR_REGNUM))
	*(regp + R_FPSR) = *(int *) &registers[REGISTER_BYTE(FPSR_REGNUM)];
    if ((regno == -1) || (regno == FPCR_REGNUM))
	*(regp + R_FPCR) = *(int *) &registers[REGISTER_BYTE(FPCR_REGNUM)];
}

#endif /* USE_PROC_FS */

#ifdef	FETCH_KCORE_REGISTERS
/*
 * Get registers from a kernel crash dump or live kernel.
 * Called by kcore-nbsd.c:get_kcore_registers().
 */
void
fetch_kcore_registers (pcb)
     struct pcb *pcb;
{
  int i, *ip, tmp=0;

  PRT ("fetch_kcore_registers");
  /* r0-r31 */
  ip = &pcb->user_state.r[0];
  for (i = 0; i < 32; i++, ip++)
    supply_register(i, (char *)ip);

  /* PSR (sr) */
  tmp = pcb->user_state.epsr & 0xFFFF;
  supply_register(PSR_REGNUM, (char *)&tmp);

  /* PC (use return address) */
  tmp = pcb->user_state.sxip;
  if (target_read_memory(tmp, (char *)&tmp, sizeof(tmp)))
    tmp = 0;
  supply_register(PC_REGNUM, (char *)&tmp);

  /* The kernel does not use the FPU, so ignore it. */
  registers_fetched ();
}
#endif	/* FETCH_KCORE_REGISTERS */

/* XXX - Add this to machine/regs.h instead? */
struct md_core {
  struct reg intreg;
  struct fpreg freg;
};

static void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
     unsigned int reg_addr;	/* Unused in this version */
{
  struct md_core *core_reg;

  PRT2 ("fetch_core_registers");
  core_reg = (struct md_core *)core_reg_sect;

  /* We get everything from the .reg section. */
  if (which != 0)
    return;

  if (core_reg_size < sizeof(*core_reg)) {
    fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
    return;
  }

  /* Integer registers */
  memcpy(&registers[REGISTER_BYTE (0)],
	 &core_reg->intreg, sizeof(struct reg));
  /* Floating point registers */

  memcpy(&registers[REGISTER_BYTE (sizeof(struct reg))],
	 &core_reg->freg, sizeof(struct fpreg));

  registers_fetched ();
}

/* Register that we are able to handle m88knbsd core file formats.
   FIXME: is this really bfd_target_unknown_flavour? 
   Yes, the netbsd core file is really bfd_target_unknown_flavour... */

static struct core_fns nat_core_fns =
{
  bfd_target_unknown_flavour,
  fetch_core_registers,
  NULL
};

void
_initialize_m88knbsd_nat ()
{
  PRT ("_initialize_m88knbsd_nat");
  add_core_fns (&nat_core_fns);
}