[deliverable/binutils-gdb.git] / gdb / ns32knbsd-nat.c

/* Functions specific to running gdb native on an ns32k running NetBSD

   Copyright 1989, 1992, 1993, 1994, 1996, 1998, 1999, 2000, 2001,
   2004 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 <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include <machine/pcb.h>

#include "defs.h"
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "regcache.h"

#define RF(dst, src) \
	memcpy(&deprecated_registers[DEPRECATED_REGISTER_BYTE(dst)], &src, sizeof(src))

#define RS(src, dst) \
	memcpy(&dst, &deprecated_registers[DEPRECATED_REGISTER_BYTE(src)], sizeof(dst))

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

  ptrace (PT_GETREGS, PIDGET (inferior_ptid),
	  (PTRACE_TYPE_ARG3) & inferior_registers, 0);
  ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
	  (PTRACE_TYPE_ARG3) & inferior_fpregisters, 0);

  RF (R0_REGNUM + 0, inferior_registers.r_r0);
  RF (R0_REGNUM + 1, inferior_registers.r_r1);
  RF (R0_REGNUM + 2, inferior_registers.r_r2);
  RF (R0_REGNUM + 3, inferior_registers.r_r3);
  RF (R0_REGNUM + 4, inferior_registers.r_r4);
  RF (R0_REGNUM + 5, inferior_registers.r_r5);
  RF (R0_REGNUM + 6, inferior_registers.r_r6);
  RF (R0_REGNUM + 7, inferior_registers.r_r7);

  RF (SP_REGNUM, inferior_registers.r_sp);
  RF (DEPRECATED_FP_REGNUM, inferior_registers.r_fp);
  RF (PC_REGNUM, inferior_registers.r_pc);
  RF (PS_REGNUM, inferior_registers.r_psr);

  RF (FPS_REGNUM, inferior_fpregisters.r_fsr);
  RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
  RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
  RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
  RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
  RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
  RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
  RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
  RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
  deprecated_registers_fetched ();
}

void
store_inferior_registers (int regno)
{
  struct reg inferior_registers;
  struct fpreg inferior_fpregisters;

  RS (R0_REGNUM + 0, inferior_registers.r_r0);
  RS (R0_REGNUM + 1, inferior_registers.r_r1);
  RS (R0_REGNUM + 2, inferior_registers.r_r2);
  RS (R0_REGNUM + 3, inferior_registers.r_r3);
  RS (R0_REGNUM + 4, inferior_registers.r_r4);
  RS (R0_REGNUM + 5, inferior_registers.r_r5);
  RS (R0_REGNUM + 6, inferior_registers.r_r6);
  RS (R0_REGNUM + 7, inferior_registers.r_r7);

  RS (SP_REGNUM, inferior_registers.r_sp);
  RS (DEPRECATED_FP_REGNUM, inferior_registers.r_fp);
  RS (PC_REGNUM, inferior_registers.r_pc);
  RS (PS_REGNUM, inferior_registers.r_psr);

  RS (FPS_REGNUM, inferior_fpregisters.r_fsr);
  RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
  RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
  RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
  RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
  RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
  RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
  RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
  RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);

  ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	  (PTRACE_TYPE_ARG3) & inferior_registers, 0);
  ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
	  (PTRACE_TYPE_ARG3) & inferior_fpregisters, 0);
}
\f

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

/* Get registers from a core file.  REG_ADDR is unused.  */
static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
		      unsigned int reg_addr)
{
  struct coreregs *core_reg;

  core_reg = (struct coreregs *) core_reg_sect;

  /*
   * We have *all* registers
   * in the first core section.
   * Ignore which.
   */

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

  /* Integer registers */
  RF (R0_REGNUM + 0, core_reg->intreg.r_r0);
  RF (R0_REGNUM + 1, core_reg->intreg.r_r1);
  RF (R0_REGNUM + 2, core_reg->intreg.r_r2);
  RF (R0_REGNUM + 3, core_reg->intreg.r_r3);
  RF (R0_REGNUM + 4, core_reg->intreg.r_r4);
  RF (R0_REGNUM + 5, core_reg->intreg.r_r5);
  RF (R0_REGNUM + 6, core_reg->intreg.r_r6);
  RF (R0_REGNUM + 7, core_reg->intreg.r_r7);

  RF (SP_REGNUM, core_reg->intreg.r_sp);
  RF (DEPRECATED_FP_REGNUM, core_reg->intreg.r_fp);
  RF (PC_REGNUM, core_reg->intreg.r_pc);
  RF (PS_REGNUM, core_reg->intreg.r_psr);

  /* Floating point registers */
  RF (FPS_REGNUM, core_reg->freg.r_fsr);
  RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]);
  RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]);
  RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]);
  RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]);
  RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
  RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
  RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
  RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
  deprecated_registers_fetched ();
}

/* Register that we are able to handle ns32knbsd core file formats.
   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns nat_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_ns32knbsd_nat (void)
{
  deprecated_add_core_fns (&nat_core_fns);
}
\f

/*
 * kernel_u_size() is not helpful on NetBSD because
 * the "u" struct is NOT in the core dump file.
 */

#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 (struct pcb *pcb)
{
  struct switchframe sf;
  struct reg intreg;
  int dummy;

  /* Integer registers */
  if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf))
    error ("Cannot read integer registers.");

  /* We use the psr at kernel entry */
  if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg))
    error ("Cannot read processor status register.");

  dummy = 0;
  RF (R0_REGNUM + 0, dummy);
  RF (R0_REGNUM + 1, dummy);
  RF (R0_REGNUM + 2, dummy);
  RF (R0_REGNUM + 3, sf.sf_r3);
  RF (R0_REGNUM + 4, sf.sf_r4);
  RF (R0_REGNUM + 5, sf.sf_r5);
  RF (R0_REGNUM + 6, sf.sf_r6);
  RF (R0_REGNUM + 7, sf.sf_r7);

  dummy = pcb->pcb_kfp + 8;
  RF (SP_REGNUM, dummy);
  RF (DEPRECATED_FP_REGNUM, sf.sf_fp);
  RF (PC_REGNUM, sf.sf_pc);
  RF (PS_REGNUM, intreg.r_psr);

  /* Floating point registers */
  RF (FPS_REGNUM, pcb->pcb_fsr);
  RF (FP0_REGNUM + 0, pcb->pcb_freg[0]);
  RF (FP0_REGNUM + 2, pcb->pcb_freg[2]);
  RF (FP0_REGNUM + 4, pcb->pcb_freg[4]);
  RF (FP0_REGNUM + 6, pcb->pcb_freg[6]);
  RF (LP0_REGNUM + 1, pcb->pcb_freg[1]);
  RF (LP0_REGNUM + 3, pcb->pcb_freg[3]);
  RF (LP0_REGNUM + 5, pcb->pcb_freg[5]);
  RF (LP0_REGNUM + 7, pcb->pcb_freg[7]);
  deprecated_registers_fetched ();
}
#endif /* FETCH_KCORE_REGISTERS */

void
clear_regs (void)
{
  double zero = 0.0;
  int null = 0;

  /* Integer registers */
  RF (R0_REGNUM + 0, null);
  RF (R0_REGNUM + 1, null);
  RF (R0_REGNUM + 2, null);
  RF (R0_REGNUM + 3, null);
  RF (R0_REGNUM + 4, null);
  RF (R0_REGNUM + 5, null);
  RF (R0_REGNUM + 6, null);
  RF (R0_REGNUM + 7, null);

  RF (SP_REGNUM, null);
  RF (DEPRECATED_FP_REGNUM, null);
  RF (PC_REGNUM, null);
  RF (PS_REGNUM, null);

  /* Floating point registers */
  RF (FPS_REGNUM, zero);
  RF (FP0_REGNUM + 0, zero);
  RF (FP0_REGNUM + 2, zero);
  RF (FP0_REGNUM + 4, zero);
  RF (FP0_REGNUM + 6, zero);
  RF (LP0_REGNUM + 0, zero);
  RF (LP0_REGNUM + 1, zero);
  RF (LP0_REGNUM + 2, zero);
  RF (LP0_REGNUM + 3, zero);
  return;
}

/* Return number of args passed to a frame.
   Can return -1, meaning no way to tell. */

int
frame_num_args (struct frame_info *fi)
{
  CORE_ADDR enter_addr;
  CORE_ADDR argp;
  int inst;
  int args;
  int i;

  if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000)
    {
      /* main is always called with three args */
      return (3);
    }
  enter_addr = ns32k_get_enter_addr (fi->pc);
  if (enter_addr = 0)
    return (-1);
  argp = (enter_addr == 1
	  ? DEPRECATED_SAVED_PC_AFTER_CALL (fi)
	  : DEPRECATED_FRAME_SAVED_PC (fi));
  for (i = 0; i < 16; i++)
    {
      /*
       * After a bsr gcc may emit the following instructions
       * to remove the arguments from the stack:
       *   cmpqd 0,tos        - to remove 4 bytes from the stack
       *   cmpd tos,tos       - to remove 8 bytes from the stack
       *   adjsp[bwd] -n      - to remove n bytes from the stack
       * Gcc sometimes delays emitting these instructions and
       * may even throw a branch between our feet.
       */
      inst = read_memory_integer (argp, 4);
      args = read_memory_integer (argp + 2, 4);
      if ((inst & 0xff) == 0xea)
	{			/* br */
	  args = ((inst >> 8) & 0xffffff) | (args << 24);
	  if (args & 0x80)
	    {
	      if (args & 0x40)
		{
		  args = ntohl (args);
		}
	      else
		{
		  args = ntohs (args & 0xffff);
		  if (args & 0x2000)
		    args |= 0xc000;
		}
	    }
	  else
	    {
	      args = args & 0xff;
	      if (args & 0x40)
		args |= 0x80;
	    }
	  argp += args;
	  continue;
	}
      if ((inst & 0xffff) == 0xb81f)	/* cmpqd 0,tos */
	return (1);
      else if ((inst & 0xffff) == 0xbdc7)	/* cmpd tos,tos */
	return (2);
      else if ((inst & 0xfffc) == 0xa57c)
	{			/* adjsp[bwd] */
	  switch (inst & 3)
	    {
	    case 0:
	      args = ((args & 0xff) + 0x80);
	      break;
	    case 1:
	      args = ((ntohs (args) & 0xffff) + 0x8000);
	      break;
	    case 3:
	      args = -ntohl (args);
	      break;
	    default:
	      return (-1);
	    }
	  if (args / 4 > 10 || (args & 3) != 0)
	    continue;
	  return (args / 4);
	}
      argp += 1;
    }
  return (-1);
}
Commit	Line	Data
c906108c	1	/* Functions specific to running gdb native on an ns32k running NetBSD
9f8e0089 MK	2
	3	Copyright 1989, 1992, 1993, 1994, 1996, 1998, 1999, 2000, 2001,
	4	2004 Free Software Foundation, Inc.
c906108c	5
c5aa993b	6	This file is part of GDB.
c906108c	7
c5aa993b JM	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
c906108c	12
c5aa993b JM	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
c906108c	17
c5aa993b JM	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 59 Temple Place - Suite 330,
	21	Boston, MA 02111-1307, USA. */
c906108c SS	22
	23	#include <sys/types.h>
	24	#include <sys/ptrace.h>
	25	#include <machine/reg.h>
	26	#include <machine/frame.h>
	27	#include <machine/pcb.h>
	28
	29	#include "defs.h"
	30	#include "inferior.h"
	31	#include "target.h"
	32	#include "gdbcore.h"
4e052eda	33	#include "regcache.h"
c906108c SS	34
c906108c SS	35	#define RF(dst, src) \
62700349	36	memcpy(&deprecated_registers[DEPRECATED_REGISTER_BYTE(dst)], &src, sizeof(src))
c906108c SS	37
c906108c SS	38	#define RS(src, dst) \
62700349	39	memcpy(&dst, &deprecated_registers[DEPRECATED_REGISTER_BYTE(src)], sizeof(dst))
c906108c SS	40
c906108c SS	41	void
fba45db2	42	fetch_inferior_registers (int regno)
c906108c SS	43	{
	44	struct reg inferior_registers;
	45	struct fpreg inferior_fpregisters;
	46
39f77062	47	ptrace (PT_GETREGS, PIDGET (inferior_ptid),
dfeafa2f	48	(PTRACE_TYPE_ARG3) & inferior_registers, 0);
39f77062	49	ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
dfeafa2f	50	(PTRACE_TYPE_ARG3) & inferior_fpregisters, 0);
c5aa993b JM	51
	52	RF (R0_REGNUM + 0, inferior_registers.r_r0);
	53	RF (R0_REGNUM + 1, inferior_registers.r_r1);
	54	RF (R0_REGNUM + 2, inferior_registers.r_r2);
	55	RF (R0_REGNUM + 3, inferior_registers.r_r3);
	56	RF (R0_REGNUM + 4, inferior_registers.r_r4);
	57	RF (R0_REGNUM + 5, inferior_registers.r_r5);
	58	RF (R0_REGNUM + 6, inferior_registers.r_r6);
	59	RF (R0_REGNUM + 7, inferior_registers.r_r7);
	60
	61	RF (SP_REGNUM, inferior_registers.r_sp);
0ba6dca9	62	RF (DEPRECATED_FP_REGNUM, inferior_registers.r_fp);
c5aa993b JM	63	RF (PC_REGNUM, inferior_registers.r_pc);
	64	RF (PS_REGNUM, inferior_registers.r_psr);
	65
	66	RF (FPS_REGNUM, inferior_fpregisters.r_fsr);
	67	RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
	68	RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
	69	RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
	70	RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
	71	RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
	72	RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
	73	RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
	74	RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
2b9e5f3f	75	deprecated_registers_fetched ();
c906108c SS	76	}
	77
	78	void
fba45db2	79	store_inferior_registers (int regno)
c906108c SS	80	{
	81	struct reg inferior_registers;
	82	struct fpreg inferior_fpregisters;
	83
c5aa993b JM	84	RS (R0_REGNUM + 0, inferior_registers.r_r0);
	85	RS (R0_REGNUM + 1, inferior_registers.r_r1);
	86	RS (R0_REGNUM + 2, inferior_registers.r_r2);
	87	RS (R0_REGNUM + 3, inferior_registers.r_r3);
	88	RS (R0_REGNUM + 4, inferior_registers.r_r4);
	89	RS (R0_REGNUM + 5, inferior_registers.r_r5);
	90	RS (R0_REGNUM + 6, inferior_registers.r_r6);
	91	RS (R0_REGNUM + 7, inferior_registers.r_r7);
	92
	93	RS (SP_REGNUM, inferior_registers.r_sp);
0ba6dca9	94	RS (DEPRECATED_FP_REGNUM, inferior_registers.r_fp);
c5aa993b JM	95	RS (PC_REGNUM, inferior_registers.r_pc);
	96	RS (PS_REGNUM, inferior_registers.r_psr);
	97
	98	RS (FPS_REGNUM, inferior_fpregisters.r_fsr);
	99	RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
	100	RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
	101	RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
	102	RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
	103	RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
	104	RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
	105	RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
	106	RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
c906108c	107
39f77062	108	ptrace (PT_SETREGS, PIDGET (inferior_ptid),
dfeafa2f	109	(PTRACE_TYPE_ARG3) & inferior_registers, 0);
39f77062	110	ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
dfeafa2f	111	(PTRACE_TYPE_ARG3) & inferior_fpregisters, 0);
c906108c SS	112	}
	113	\f
	114
	115	/* XXX - Add this to machine/regs.h instead? */
c5aa993b JM	116	struct coreregs
c5aa993b JM	117	{
c906108c SS	118	struct reg intreg;
	119	struct fpreg freg;
	120	};
	121
697ec6c4	122	/* Get registers from a core file. REG_ADDR is unused. */
c906108c	123	static void
697ec6c4 KB	124	fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
697ec6c4 KB	125	unsigned int reg_addr)
c906108c SS	126	{
	127	struct coreregs *core_reg;
	128
c5aa993b	129	core_reg = (struct coreregs *) core_reg_sect;
c906108c SS	130
	131	/*
	132	* We have all registers
	133	* in the first core section.
	134	* Ignore which.
	135	*/
	136
c5aa993b JM	137	if (core_reg_size < sizeof (*core_reg))
	138	{
	139	fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
	140	return;
	141	}
c906108c SS	142
c906108c SS	143	/* Integer registers */
c5aa993b JM	144	RF (R0_REGNUM + 0, core_reg->intreg.r_r0);
	145	RF (R0_REGNUM + 1, core_reg->intreg.r_r1);
	146	RF (R0_REGNUM + 2, core_reg->intreg.r_r2);
	147	RF (R0_REGNUM + 3, core_reg->intreg.r_r3);
	148	RF (R0_REGNUM + 4, core_reg->intreg.r_r4);
	149	RF (R0_REGNUM + 5, core_reg->intreg.r_r5);
	150	RF (R0_REGNUM + 6, core_reg->intreg.r_r6);
	151	RF (R0_REGNUM + 7, core_reg->intreg.r_r7);
	152
	153	RF (SP_REGNUM, core_reg->intreg.r_sp);
0ba6dca9	154	RF (DEPRECATED_FP_REGNUM, core_reg->intreg.r_fp);
c5aa993b JM	155	RF (PC_REGNUM, core_reg->intreg.r_pc);
c5aa993b JM	156	RF (PS_REGNUM, core_reg->intreg.r_psr);
c906108c SS	157
c906108c SS	158	/* Floating point registers */
c5aa993b JM	159	RF (FPS_REGNUM, core_reg->freg.r_fsr);
	160	RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]);
	161	RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]);
	162	RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]);
	163	RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]);
	164	RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
	165	RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
	166	RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
	167	RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
2b9e5f3f	168	deprecated_registers_fetched ();
c906108c SS	169	}
	170
	171	/* Register that we are able to handle ns32knbsd core file formats.
	172	FIXME: is this really bfd_target_unknown_flavour? */
	173
	174	static struct core_fns nat_core_fns =
	175	{
2acceee2 JM	176	bfd_target_unknown_flavour, /* core_flavour */
	177	default_check_format, /* check_format */
	178	default_core_sniffer, /* core_sniffer */
	179	fetch_core_registers, /* core_read_registers */
	180	NULL /* next */
c906108c SS	181	};
	182
	183	void
fba45db2	184	_initialize_ns32knbsd_nat (void)
c906108c	185	{
00e32a35	186	deprecated_add_core_fns (&nat_core_fns);
c906108c SS	187	}
	188	\f
	189
	190	/*
	191	* kernel_u_size() is not helpful on NetBSD because
	192	* the "u" struct is NOT in the core dump file.
	193	*/
	194
	195	#ifdef FETCH_KCORE_REGISTERS
	196	/*
	197	* Get registers from a kernel crash dump or live kernel.
	198	* Called by kcore-nbsd.c:get_kcore_registers().
	199	*/
	200	void
fba45db2	201	fetch_kcore_registers (struct pcb *pcb)
c906108c SS	202	{
	203	struct switchframe sf;
	204	struct reg intreg;
	205	int dummy;
	206
	207	/* Integer registers */
c5aa993b JM	208	if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf))
c5aa993b JM	209	error ("Cannot read integer registers.");
c906108c SS	210
c906108c SS	211	/* We use the psr at kernel entry */
c5aa993b JM	212	if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg))
c5aa993b JM	213	error ("Cannot read processor status register.");
c906108c SS	214
c906108c SS	215	dummy = 0;
c5aa993b JM	216	RF (R0_REGNUM + 0, dummy);
	217	RF (R0_REGNUM + 1, dummy);
	218	RF (R0_REGNUM + 2, dummy);
	219	RF (R0_REGNUM + 3, sf.sf_r3);
	220	RF (R0_REGNUM + 4, sf.sf_r4);
	221	RF (R0_REGNUM + 5, sf.sf_r5);
	222	RF (R0_REGNUM + 6, sf.sf_r6);
	223	RF (R0_REGNUM + 7, sf.sf_r7);
c906108c SS	224
c906108c SS	225	dummy = pcb->pcb_kfp + 8;
c5aa993b	226	RF (SP_REGNUM, dummy);
0ba6dca9	227	RF (DEPRECATED_FP_REGNUM, sf.sf_fp);
c5aa993b JM	228	RF (PC_REGNUM, sf.sf_pc);
c5aa993b JM	229	RF (PS_REGNUM, intreg.r_psr);
c906108c SS	230
c906108c SS	231	/* Floating point registers */
c5aa993b JM	232	RF (FPS_REGNUM, pcb->pcb_fsr);
	233	RF (FP0_REGNUM + 0, pcb->pcb_freg[0]);
	234	RF (FP0_REGNUM + 2, pcb->pcb_freg[2]);
	235	RF (FP0_REGNUM + 4, pcb->pcb_freg[4]);
	236	RF (FP0_REGNUM + 6, pcb->pcb_freg[6]);
	237	RF (LP0_REGNUM + 1, pcb->pcb_freg[1]);
	238	RF (LP0_REGNUM + 3, pcb->pcb_freg[3]);
	239	RF (LP0_REGNUM + 5, pcb->pcb_freg[5]);
	240	RF (LP0_REGNUM + 7, pcb->pcb_freg[7]);
2b9e5f3f	241	deprecated_registers_fetched ();
c906108c	242	}
c5aa993b	243	#endif /* FETCH_KCORE_REGISTERS */
c906108c SS	244
c906108c SS	245	void
fba45db2	246	clear_regs (void)
c906108c SS	247	{
	248	double zero = 0.0;
	249	int null = 0;
c5aa993b	250
c906108c	251	/* Integer registers */
c5aa993b JM	252	RF (R0_REGNUM + 0, null);
	253	RF (R0_REGNUM + 1, null);
	254	RF (R0_REGNUM + 2, null);
	255	RF (R0_REGNUM + 3, null);
	256	RF (R0_REGNUM + 4, null);
	257	RF (R0_REGNUM + 5, null);
	258	RF (R0_REGNUM + 6, null);
	259	RF (R0_REGNUM + 7, null);
	260
	261	RF (SP_REGNUM, null);
0ba6dca9	262	RF (DEPRECATED_FP_REGNUM, null);
c5aa993b JM	263	RF (PC_REGNUM, null);
c5aa993b JM	264	RF (PS_REGNUM, null);
c906108c SS	265
c906108c SS	266	/* Floating point registers */
c5aa993b JM	267	RF (FPS_REGNUM, zero);
	268	RF (FP0_REGNUM + 0, zero);
	269	RF (FP0_REGNUM + 2, zero);
	270	RF (FP0_REGNUM + 4, zero);
	271	RF (FP0_REGNUM + 6, zero);
	272	RF (LP0_REGNUM + 0, zero);
	273	RF (LP0_REGNUM + 1, zero);
	274	RF (LP0_REGNUM + 2, zero);
	275	RF (LP0_REGNUM + 3, zero);
c906108c SS	276	return;
	277	}
	278
	279	/* Return number of args passed to a frame.
	280	Can return -1, meaning no way to tell. */
	281
	282	int
fba45db2	283	frame_num_args (struct frame_info *fi)
c906108c	284	{
c5aa993b JM	285	CORE_ADDR enter_addr;
	286	CORE_ADDR argp;
	287	int inst;
	288	int args;
	289	int i;
	290
	291	if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000)
	292	{
	293	/* main is always called with three args */
	294	return (3);
	295	}
	296	enter_addr = ns32k_get_enter_addr (fi->pc);
	297	if (enter_addr = 0)
	298	return (-1);
6913c89a AC	299	argp = (enter_addr == 1
	300	? DEPRECATED_SAVED_PC_AFTER_CALL (fi)
	301	: DEPRECATED_FRAME_SAVED_PC (fi));
c5aa993b JM	302	for (i = 0; i < 16; i++)
	303	{
	304	/*
	305	* After a bsr gcc may emit the following instructions
	306	* to remove the arguments from the stack:
	307	* cmpqd 0,tos - to remove 4 bytes from the stack
	308	* cmpd tos,tos - to remove 8 bytes from the stack
	309	* adjsp[bwd] -n - to remove n bytes from the stack
	310	* Gcc sometimes delays emitting these instructions and
	311	* may even throw a branch between our feet.
	312	*/
	313	inst = read_memory_integer (argp, 4);
	314	args = read_memory_integer (argp + 2, 4);
	315	if ((inst & 0xff) == 0xea)
	316	{ /* br */
	317	args = ((inst >> 8) & 0xffffff) \| (args << 24);
	318	if (args & 0x80)
	319	{
	320	if (args & 0x40)
	321	{
	322	args = ntohl (args);
c906108c	323	}
c5aa993b JM	324	else
	325	{
	326	args = ntohs (args & 0xffff);
	327	if (args & 0x2000)
	328	args \|= 0xc000;
c906108c	329	}
c5aa993b JM	330	}
	331	else
	332	{
	333	args = args & 0xff;
	334	if (args & 0x40)
	335	args \|= 0x80;
	336	}
	337	argp += args;
	338	continue;
	339	}
	340	if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */
	341	return (1);
	342	else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */
	343	return (2);
	344	else if ((inst & 0xfffc) == 0xa57c)
	345	{ /* adjsp[bwd] */
	346	switch (inst & 3)
	347	{
	348	case 0:
	349	args = ((args & 0xff) + 0x80);
	350	break;
	351	case 1:
	352	args = ((ntohs (args) & 0xffff) + 0x8000);
	353	break;
	354	case 3:
	355	args = -ntohl (args);
	356	break;
	357	default:
	358	return (-1);
	359	}
	360	if (args / 4 > 10 \|\| (args & 3) != 0)
	361	continue;
	362	return (args / 4);
c906108c	363	}
c5aa993b JM	364	argp += 1;
	365	}
	366	return (-1);
c906108c	367	}