[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 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"

#define RF(dst, src) \
	memcpy(&registers[REGISTER_BYTE(dst)], &src, sizeof(src))

#define RS(src, dst) \
	memcpy(&dst, &registers[REGISTER_BYTE(src)], sizeof(dst))

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

  ptrace (PT_GETREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  ptrace (PT_GETFPREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) & 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 (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]);
  registers_fetched ();
}

void
store_inferior_registers (regno)
     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 (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, inferior_pid,
	  (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  ptrace (PT_SETFPREGS, inferior_pid,
	  (PTRACE_ARG3_TYPE) & 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. */
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 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 (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]);
  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 ()
{
  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 (pcb)
     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 (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]);
  registers_fetched ();
}
#endif /* FETCH_KCORE_REGISTERS */

void
clear_regs ()
{
  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 (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 (fi)
     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 ? SAVED_PC_AFTER_CALL (fi) : 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 SS	1	/* Functions specific to running gdb native on an ns32k running NetBSD
	2	Copyright 1989, 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
	3
c5aa993b	4	This file is part of GDB.
c906108c	5
c5aa993b JM	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
c906108c	10
c5aa993b JM	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
c906108c	15
c5aa993b JM	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
c906108c SS	20
	21	#include <sys/types.h>
	22	#include <sys/ptrace.h>
	23	#include <machine/reg.h>
	24	#include <machine/frame.h>
	25	#include <machine/pcb.h>
	26
	27	#include "defs.h"
	28	#include "inferior.h"
	29	#include "target.h"
	30	#include "gdbcore.h"
	31
	32	#define RF(dst, src) \
	33	memcpy(&registers[REGISTER_BYTE(dst)], &src, sizeof(src))
	34
	35	#define RS(src, dst) \
	36	memcpy(&dst, &registers[REGISTER_BYTE(src)], sizeof(dst))
	37
	38	void
	39	fetch_inferior_registers (regno)
	40	int regno;
	41	{
	42	struct reg inferior_registers;
	43	struct fpreg inferior_fpregisters;
	44
	45	ptrace (PT_GETREGS, inferior_pid,
c5aa993b	46	(PTRACE_ARG3_TYPE) & inferior_registers, 0);
c906108c	47	ptrace (PT_GETFPREGS, inferior_pid,
c5aa993b JM	48	(PTRACE_ARG3_TYPE) & inferior_fpregisters, 0);
	49
	50	RF (R0_REGNUM + 0, inferior_registers.r_r0);
	51	RF (R0_REGNUM + 1, inferior_registers.r_r1);
	52	RF (R0_REGNUM + 2, inferior_registers.r_r2);
	53	RF (R0_REGNUM + 3, inferior_registers.r_r3);
	54	RF (R0_REGNUM + 4, inferior_registers.r_r4);
	55	RF (R0_REGNUM + 5, inferior_registers.r_r5);
	56	RF (R0_REGNUM + 6, inferior_registers.r_r6);
	57	RF (R0_REGNUM + 7, inferior_registers.r_r7);
	58
	59	RF (SP_REGNUM, inferior_registers.r_sp);
	60	RF (FP_REGNUM, inferior_registers.r_fp);
	61	RF (PC_REGNUM, inferior_registers.r_pc);
	62	RF (PS_REGNUM, inferior_registers.r_psr);
	63
	64	RF (FPS_REGNUM, inferior_fpregisters.r_fsr);
	65	RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
	66	RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
	67	RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
	68	RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
	69	RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
	70	RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
	71	RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
	72	RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
	73	registers_fetched ();
c906108c SS	74	}
	75
	76	void
	77	store_inferior_registers (regno)
	78	int regno;
	79	{
	80	struct reg inferior_registers;
	81	struct fpreg inferior_fpregisters;
	82
c5aa993b JM	83	RS (R0_REGNUM + 0, inferior_registers.r_r0);
	84	RS (R0_REGNUM + 1, inferior_registers.r_r1);
	85	RS (R0_REGNUM + 2, inferior_registers.r_r2);
	86	RS (R0_REGNUM + 3, inferior_registers.r_r3);
	87	RS (R0_REGNUM + 4, inferior_registers.r_r4);
	88	RS (R0_REGNUM + 5, inferior_registers.r_r5);
	89	RS (R0_REGNUM + 6, inferior_registers.r_r6);
	90	RS (R0_REGNUM + 7, inferior_registers.r_r7);
	91
	92	RS (SP_REGNUM, inferior_registers.r_sp);
	93	RS (FP_REGNUM, inferior_registers.r_fp);
	94	RS (PC_REGNUM, inferior_registers.r_pc);
	95	RS (PS_REGNUM, inferior_registers.r_psr);
	96
	97	RS (FPS_REGNUM, inferior_fpregisters.r_fsr);
	98	RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
	99	RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
	100	RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
	101	RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
	102	RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
	103	RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
	104	RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
	105	RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
c906108c SS	106
c906108c SS	107	ptrace (PT_SETREGS, inferior_pid,
c5aa993b	108	(PTRACE_ARG3_TYPE) & inferior_registers, 0);
c906108c	109	ptrace (PT_SETFPREGS, inferior_pid,
c5aa993b	110	(PTRACE_ARG3_TYPE) & inferior_fpregisters, 0);
c906108c SS	111	}
	112	\f
	113
	114	/* XXX - Add this to machine/regs.h instead? */
c5aa993b JM	115	struct coreregs
c5aa993b JM	116	{
c906108c SS	117	struct reg intreg;
	118	struct fpreg freg;
	119	};
	120
	121	/* Get registers from a core file. */
	122	static void
	123	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
	124	char *core_reg_sect;
	125	unsigned core_reg_size;
	126	int which;
	127	unsigned int reg_addr; /* Unused in this version */
	128	{
	129	struct coreregs *core_reg;
	130
c5aa993b	131	core_reg = (struct coreregs *) core_reg_sect;
c906108c SS	132
	133	/*
	134	* We have all registers
	135	* in the first core section.
	136	* Ignore which.
	137	*/
	138
c5aa993b JM	139	if (core_reg_size < sizeof (*core_reg))
	140	{
	141	fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
	142	return;
	143	}
c906108c SS	144
c906108c SS	145	/* Integer registers */
c5aa993b JM	146	RF (R0_REGNUM + 0, core_reg->intreg.r_r0);
	147	RF (R0_REGNUM + 1, core_reg->intreg.r_r1);
	148	RF (R0_REGNUM + 2, core_reg->intreg.r_r2);
	149	RF (R0_REGNUM + 3, core_reg->intreg.r_r3);
	150	RF (R0_REGNUM + 4, core_reg->intreg.r_r4);
	151	RF (R0_REGNUM + 5, core_reg->intreg.r_r5);
	152	RF (R0_REGNUM + 6, core_reg->intreg.r_r6);
	153	RF (R0_REGNUM + 7, core_reg->intreg.r_r7);
	154
	155	RF (SP_REGNUM, core_reg->intreg.r_sp);
	156	RF (FP_REGNUM, core_reg->intreg.r_fp);
	157	RF (PC_REGNUM, core_reg->intreg.r_pc);
	158	RF (PS_REGNUM, core_reg->intreg.r_psr);
c906108c SS	159
c906108c SS	160	/* Floating point registers */
c5aa993b JM	161	RF (FPS_REGNUM, core_reg->freg.r_fsr);
	162	RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]);
	163	RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]);
	164	RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]);
	165	RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]);
	166	RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
	167	RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
	168	RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
	169	RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
c906108c SS	170	registers_fetched ();
	171	}
	172
	173	/* Register that we are able to handle ns32knbsd core file formats.
	174	FIXME: is this really bfd_target_unknown_flavour? */
	175
	176	static struct core_fns nat_core_fns =
	177	{
2acceee2 JM	178	bfd_target_unknown_flavour, /* core_flavour */
	179	default_check_format, /* check_format */
	180	default_core_sniffer, /* core_sniffer */
	181	fetch_core_registers, /* core_read_registers */
	182	NULL /* next */
c906108c SS	183	};
	184
	185	void
	186	_initialize_ns32knbsd_nat ()
	187	{
	188	add_core_fns (&nat_core_fns);
	189	}
	190	\f
	191
	192	/*
	193	* kernel_u_size() is not helpful on NetBSD because
	194	* the "u" struct is NOT in the core dump file.
	195	*/
	196
	197	#ifdef FETCH_KCORE_REGISTERS
	198	/*
	199	* Get registers from a kernel crash dump or live kernel.
	200	* Called by kcore-nbsd.c:get_kcore_registers().
	201	*/
	202	void
	203	fetch_kcore_registers (pcb)
	204	struct pcb *pcb;
	205	{
	206	struct switchframe sf;
	207	struct reg intreg;
	208	int dummy;
	209
	210	/* Integer registers */
c5aa993b JM	211	if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf))
c5aa993b JM	212	error ("Cannot read integer registers.");
c906108c SS	213
c906108c SS	214	/* We use the psr at kernel entry */
c5aa993b JM	215	if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg))
c5aa993b JM	216	error ("Cannot read processor status register.");
c906108c SS	217
c906108c SS	218	dummy = 0;
c5aa993b JM	219	RF (R0_REGNUM + 0, dummy);
	220	RF (R0_REGNUM + 1, dummy);
	221	RF (R0_REGNUM + 2, dummy);
	222	RF (R0_REGNUM + 3, sf.sf_r3);
	223	RF (R0_REGNUM + 4, sf.sf_r4);
	224	RF (R0_REGNUM + 5, sf.sf_r5);
	225	RF (R0_REGNUM + 6, sf.sf_r6);
	226	RF (R0_REGNUM + 7, sf.sf_r7);
c906108c SS	227
c906108c SS	228	dummy = pcb->pcb_kfp + 8;
c5aa993b JM	229	RF (SP_REGNUM, dummy);
	230	RF (FP_REGNUM, sf.sf_fp);
	231	RF (PC_REGNUM, sf.sf_pc);
	232	RF (PS_REGNUM, intreg.r_psr);
c906108c SS	233
c906108c SS	234	/* Floating point registers */
c5aa993b JM	235	RF (FPS_REGNUM, pcb->pcb_fsr);
	236	RF (FP0_REGNUM + 0, pcb->pcb_freg[0]);
	237	RF (FP0_REGNUM + 2, pcb->pcb_freg[2]);
	238	RF (FP0_REGNUM + 4, pcb->pcb_freg[4]);
	239	RF (FP0_REGNUM + 6, pcb->pcb_freg[6]);
	240	RF (LP0_REGNUM + 1, pcb->pcb_freg[1]);
	241	RF (LP0_REGNUM + 3, pcb->pcb_freg[3]);
	242	RF (LP0_REGNUM + 5, pcb->pcb_freg[5]);
	243	RF (LP0_REGNUM + 7, pcb->pcb_freg[7]);
c906108c SS	244	registers_fetched ();
c906108c SS	245	}
c5aa993b	246	#endif /* FETCH_KCORE_REGISTERS */
c906108c SS	247
c906108c SS	248	void
c5aa993b	249	clear_regs ()
c906108c SS	250	{
	251	double zero = 0.0;
	252	int null = 0;
c5aa993b	253
c906108c	254	/* Integer registers */
c5aa993b JM	255	RF (R0_REGNUM + 0, null);
	256	RF (R0_REGNUM + 1, null);
	257	RF (R0_REGNUM + 2, null);
	258	RF (R0_REGNUM + 3, null);
	259	RF (R0_REGNUM + 4, null);
	260	RF (R0_REGNUM + 5, null);
	261	RF (R0_REGNUM + 6, null);
	262	RF (R0_REGNUM + 7, null);
	263
	264	RF (SP_REGNUM, null);
	265	RF (FP_REGNUM, null);
	266	RF (PC_REGNUM, null);
	267	RF (PS_REGNUM, null);
c906108c SS	268
c906108c SS	269	/* Floating point registers */
c5aa993b JM	270	RF (FPS_REGNUM, zero);
	271	RF (FP0_REGNUM + 0, zero);
	272	RF (FP0_REGNUM + 2, zero);
	273	RF (FP0_REGNUM + 4, zero);
	274	RF (FP0_REGNUM + 6, zero);
	275	RF (LP0_REGNUM + 0, zero);
	276	RF (LP0_REGNUM + 1, zero);
	277	RF (LP0_REGNUM + 2, zero);
	278	RF (LP0_REGNUM + 3, zero);
c906108c SS	279	return;
	280	}
	281
	282	/* Return number of args passed to a frame.
	283	Can return -1, meaning no way to tell. */
	284
	285	int
c5aa993b JM	286	frame_num_args (fi)
c5aa993b JM	287	struct frame_info *fi;
c906108c	288	{
c5aa993b JM	289	CORE_ADDR enter_addr;
	290	CORE_ADDR argp;
	291	int inst;
	292	int args;
	293	int i;
	294
	295	if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000)
	296	{
	297	/* main is always called with three args */
	298	return (3);
	299	}
	300	enter_addr = ns32k_get_enter_addr (fi->pc);
	301	if (enter_addr = 0)
	302	return (-1);
	303	argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL (fi) : FRAME_SAVED_PC (fi);
	304	for (i = 0; i < 16; i++)
	305	{
	306	/*
	307	* After a bsr gcc may emit the following instructions
	308	* to remove the arguments from the stack:
	309	* cmpqd 0,tos - to remove 4 bytes from the stack
	310	* cmpd tos,tos - to remove 8 bytes from the stack
	311	* adjsp[bwd] -n - to remove n bytes from the stack
	312	* Gcc sometimes delays emitting these instructions and
	313	* may even throw a branch between our feet.
	314	*/
	315	inst = read_memory_integer (argp, 4);
	316	args = read_memory_integer (argp + 2, 4);
	317	if ((inst & 0xff) == 0xea)
	318	{ /* br */
	319	args = ((inst >> 8) & 0xffffff) \| (args << 24);
	320	if (args & 0x80)
	321	{
	322	if (args & 0x40)
	323	{
	324	args = ntohl (args);
c906108c	325	}
c5aa993b JM	326	else
	327	{
	328	args = ntohs (args & 0xffff);
	329	if (args & 0x2000)
	330	args \|= 0xc000;
c906108c	331	}
c5aa993b JM	332	}
	333	else
	334	{
	335	args = args & 0xff;
	336	if (args & 0x40)
	337	args \|= 0x80;
	338	}
	339	argp += args;
	340	continue;
	341	}
	342	if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */
	343	return (1);
	344	else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */
	345	return (2);
	346	else if ((inst & 0xfffc) == 0xa57c)
	347	{ /* adjsp[bwd] */
	348	switch (inst & 3)
	349	{
	350	case 0:
	351	args = ((args & 0xff) + 0x80);
	352	break;
	353	case 1:
	354	args = ((ntohs (args) & 0xffff) + 0x8000);
	355	break;
	356	case 3:
	357	args = -ntohl (args);
	358	break;
	359	default:
	360	return (-1);
	361	}
	362	if (args / 4 > 10 \|\| (args & 3) != 0)
	363	continue;
	364	return (args / 4);
c906108c	365	}
c5aa993b JM	366	argp += 1;
	367	}
	368	return (-1);
c906108c	369	}