[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 (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 (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.  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 (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 (void)
{
  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 (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 (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 (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 ? 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
fba45db2	39	fetch_inferior_registers (int regno)
c906108c SS	40	{
	41	struct reg inferior_registers;
	42	struct fpreg inferior_fpregisters;
	43
	44	ptrace (PT_GETREGS, inferior_pid,
c5aa993b	45	(PTRACE_ARG3_TYPE) & inferior_registers, 0);
c906108c	46	ptrace (PT_GETFPREGS, inferior_pid,
c5aa993b JM	47	(PTRACE_ARG3_TYPE) & inferior_fpregisters, 0);
	48
	49	RF (R0_REGNUM + 0, inferior_registers.r_r0);
	50	RF (R0_REGNUM + 1, inferior_registers.r_r1);
	51	RF (R0_REGNUM + 2, inferior_registers.r_r2);
	52	RF (R0_REGNUM + 3, inferior_registers.r_r3);
	53	RF (R0_REGNUM + 4, inferior_registers.r_r4);
	54	RF (R0_REGNUM + 5, inferior_registers.r_r5);
	55	RF (R0_REGNUM + 6, inferior_registers.r_r6);
	56	RF (R0_REGNUM + 7, inferior_registers.r_r7);
	57
	58	RF (SP_REGNUM, inferior_registers.r_sp);
	59	RF (FP_REGNUM, inferior_registers.r_fp);
	60	RF (PC_REGNUM, inferior_registers.r_pc);
	61	RF (PS_REGNUM, inferior_registers.r_psr);
	62
	63	RF (FPS_REGNUM, inferior_fpregisters.r_fsr);
	64	RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
	65	RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
	66	RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
	67	RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
	68	RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
	69	RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
	70	RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
	71	RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
	72	registers_fetched ();
c906108c SS	73	}
	74
	75	void
fba45db2	76	store_inferior_registers (int regno)
c906108c SS	77	{
	78	struct reg inferior_registers;
	79	struct fpreg inferior_fpregisters;
	80
c5aa993b JM	81	RS (R0_REGNUM + 0, inferior_registers.r_r0);
	82	RS (R0_REGNUM + 1, inferior_registers.r_r1);
	83	RS (R0_REGNUM + 2, inferior_registers.r_r2);
	84	RS (R0_REGNUM + 3, inferior_registers.r_r3);
	85	RS (R0_REGNUM + 4, inferior_registers.r_r4);
	86	RS (R0_REGNUM + 5, inferior_registers.r_r5);
	87	RS (R0_REGNUM + 6, inferior_registers.r_r6);
	88	RS (R0_REGNUM + 7, inferior_registers.r_r7);
	89
	90	RS (SP_REGNUM, inferior_registers.r_sp);
	91	RS (FP_REGNUM, inferior_registers.r_fp);
	92	RS (PC_REGNUM, inferior_registers.r_pc);
	93	RS (PS_REGNUM, inferior_registers.r_psr);
	94
	95	RS (FPS_REGNUM, inferior_fpregisters.r_fsr);
	96	RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]);
	97	RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]);
	98	RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]);
	99	RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]);
	100	RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]);
	101	RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]);
	102	RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]);
	103	RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]);
c906108c SS	104
c906108c SS	105	ptrace (PT_SETREGS, inferior_pid,
c5aa993b	106	(PTRACE_ARG3_TYPE) & inferior_registers, 0);
c906108c	107	ptrace (PT_SETFPREGS, inferior_pid,
c5aa993b	108	(PTRACE_ARG3_TYPE) & inferior_fpregisters, 0);
c906108c SS	109	}
	110	\f
	111
	112	/* XXX - Add this to machine/regs.h instead? */
c5aa993b JM	113	struct coreregs
c5aa993b JM	114	{
c906108c SS	115	struct reg intreg;
	116	struct fpreg freg;
	117	};
	118
697ec6c4	119	/* Get registers from a core file. REG_ADDR is unused. */
c906108c	120	static void
697ec6c4 KB	121	fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
697ec6c4 KB	122	unsigned int reg_addr)
c906108c SS	123	{
	124	struct coreregs *core_reg;
	125
c5aa993b	126	core_reg = (struct coreregs *) core_reg_sect;
c906108c SS	127
	128	/*
	129	* We have all registers
	130	* in the first core section.
	131	* Ignore which.
	132	*/
	133
c5aa993b JM	134	if (core_reg_size < sizeof (*core_reg))
	135	{
	136	fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n");
	137	return;
	138	}
c906108c SS	139
c906108c SS	140	/* Integer registers */
c5aa993b JM	141	RF (R0_REGNUM + 0, core_reg->intreg.r_r0);
	142	RF (R0_REGNUM + 1, core_reg->intreg.r_r1);
	143	RF (R0_REGNUM + 2, core_reg->intreg.r_r2);
	144	RF (R0_REGNUM + 3, core_reg->intreg.r_r3);
	145	RF (R0_REGNUM + 4, core_reg->intreg.r_r4);
	146	RF (R0_REGNUM + 5, core_reg->intreg.r_r5);
	147	RF (R0_REGNUM + 6, core_reg->intreg.r_r6);
	148	RF (R0_REGNUM + 7, core_reg->intreg.r_r7);
	149
	150	RF (SP_REGNUM, core_reg->intreg.r_sp);
	151	RF (FP_REGNUM, core_reg->intreg.r_fp);
	152	RF (PC_REGNUM, core_reg->intreg.r_pc);
	153	RF (PS_REGNUM, core_reg->intreg.r_psr);
c906108c SS	154
c906108c SS	155	/* Floating point registers */
c5aa993b JM	156	RF (FPS_REGNUM, core_reg->freg.r_fsr);
	157	RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]);
	158	RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]);
	159	RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]);
	160	RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]);
	161	RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]);
	162	RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]);
	163	RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]);
	164	RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]);
c906108c SS	165	registers_fetched ();
	166	}
	167
	168	/* Register that we are able to handle ns32knbsd core file formats.
	169	FIXME: is this really bfd_target_unknown_flavour? */
	170
	171	static struct core_fns nat_core_fns =
	172	{
2acceee2 JM	173	bfd_target_unknown_flavour, /* core_flavour */
	174	default_check_format, /* check_format */
	175	default_core_sniffer, /* core_sniffer */
	176	fetch_core_registers, /* core_read_registers */
	177	NULL /* next */
c906108c SS	178	};
	179
	180	void
fba45db2	181	_initialize_ns32knbsd_nat (void)
c906108c SS	182	{
	183	add_core_fns (&nat_core_fns);
	184	}
	185	\f
	186
	187	/*
	188	* kernel_u_size() is not helpful on NetBSD because
	189	* the "u" struct is NOT in the core dump file.
	190	*/
	191
	192	#ifdef FETCH_KCORE_REGISTERS
	193	/*
	194	* Get registers from a kernel crash dump or live kernel.
	195	* Called by kcore-nbsd.c:get_kcore_registers().
	196	*/
	197	void
fba45db2	198	fetch_kcore_registers (struct pcb *pcb)
c906108c SS	199	{
	200	struct switchframe sf;
	201	struct reg intreg;
	202	int dummy;
	203
	204	/* Integer registers */
c5aa993b JM	205	if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf))
c5aa993b JM	206	error ("Cannot read integer registers.");
c906108c SS	207
c906108c SS	208	/* We use the psr at kernel entry */
c5aa993b JM	209	if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg))
c5aa993b JM	210	error ("Cannot read processor status register.");
c906108c SS	211
c906108c SS	212	dummy = 0;
c5aa993b JM	213	RF (R0_REGNUM + 0, dummy);
	214	RF (R0_REGNUM + 1, dummy);
	215	RF (R0_REGNUM + 2, dummy);
	216	RF (R0_REGNUM + 3, sf.sf_r3);
	217	RF (R0_REGNUM + 4, sf.sf_r4);
	218	RF (R0_REGNUM + 5, sf.sf_r5);
	219	RF (R0_REGNUM + 6, sf.sf_r6);
	220	RF (R0_REGNUM + 7, sf.sf_r7);
c906108c SS	221
c906108c SS	222	dummy = pcb->pcb_kfp + 8;
c5aa993b JM	223	RF (SP_REGNUM, dummy);
	224	RF (FP_REGNUM, sf.sf_fp);
	225	RF (PC_REGNUM, sf.sf_pc);
	226	RF (PS_REGNUM, intreg.r_psr);
c906108c SS	227
c906108c SS	228	/* Floating point registers */
c5aa993b JM	229	RF (FPS_REGNUM, pcb->pcb_fsr);
	230	RF (FP0_REGNUM + 0, pcb->pcb_freg[0]);
	231	RF (FP0_REGNUM + 2, pcb->pcb_freg[2]);
	232	RF (FP0_REGNUM + 4, pcb->pcb_freg[4]);
	233	RF (FP0_REGNUM + 6, pcb->pcb_freg[6]);
	234	RF (LP0_REGNUM + 1, pcb->pcb_freg[1]);
	235	RF (LP0_REGNUM + 3, pcb->pcb_freg[3]);
	236	RF (LP0_REGNUM + 5, pcb->pcb_freg[5]);
	237	RF (LP0_REGNUM + 7, pcb->pcb_freg[7]);
c906108c SS	238	registers_fetched ();
c906108c SS	239	}
c5aa993b	240	#endif /* FETCH_KCORE_REGISTERS */
c906108c SS	241
c906108c SS	242	void
fba45db2	243	clear_regs (void)
c906108c SS	244	{
	245	double zero = 0.0;
	246	int null = 0;
c5aa993b	247
c906108c	248	/* Integer registers */
c5aa993b JM	249	RF (R0_REGNUM + 0, null);
	250	RF (R0_REGNUM + 1, null);
	251	RF (R0_REGNUM + 2, null);
	252	RF (R0_REGNUM + 3, null);
	253	RF (R0_REGNUM + 4, null);
	254	RF (R0_REGNUM + 5, null);
	255	RF (R0_REGNUM + 6, null);
	256	RF (R0_REGNUM + 7, null);
	257
	258	RF (SP_REGNUM, null);
	259	RF (FP_REGNUM, null);
	260	RF (PC_REGNUM, null);
	261	RF (PS_REGNUM, null);
c906108c SS	262
c906108c SS	263	/* Floating point registers */
c5aa993b JM	264	RF (FPS_REGNUM, zero);
	265	RF (FP0_REGNUM + 0, zero);
	266	RF (FP0_REGNUM + 2, zero);
	267	RF (FP0_REGNUM + 4, zero);
	268	RF (FP0_REGNUM + 6, zero);
	269	RF (LP0_REGNUM + 0, zero);
	270	RF (LP0_REGNUM + 1, zero);
	271	RF (LP0_REGNUM + 2, zero);
	272	RF (LP0_REGNUM + 3, zero);
c906108c SS	273	return;
	274	}
	275
	276	/* Return number of args passed to a frame.
	277	Can return -1, meaning no way to tell. */
	278
	279	int
fba45db2	280	frame_num_args (struct frame_info *fi)
c906108c	281	{
c5aa993b JM	282	CORE_ADDR enter_addr;
	283	CORE_ADDR argp;
	284	int inst;
	285	int args;
	286	int i;
	287
	288	if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000)
	289	{
	290	/* main is always called with three args */
	291	return (3);
	292	}
	293	enter_addr = ns32k_get_enter_addr (fi->pc);
	294	if (enter_addr = 0)
	295	return (-1);
	296	argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL (fi) : FRAME_SAVED_PC (fi);
	297	for (i = 0; i < 16; i++)
	298	{
	299	/*
	300	* After a bsr gcc may emit the following instructions
	301	* to remove the arguments from the stack:
	302	* cmpqd 0,tos - to remove 4 bytes from the stack
	303	* cmpd tos,tos - to remove 8 bytes from the stack
	304	* adjsp[bwd] -n - to remove n bytes from the stack
	305	* Gcc sometimes delays emitting these instructions and
	306	* may even throw a branch between our feet.
	307	*/
	308	inst = read_memory_integer (argp, 4);
	309	args = read_memory_integer (argp + 2, 4);
	310	if ((inst & 0xff) == 0xea)
	311	{ /* br */
	312	args = ((inst >> 8) & 0xffffff) \| (args << 24);
	313	if (args & 0x80)
	314	{
	315	if (args & 0x40)
	316	{
	317	args = ntohl (args);
c906108c	318	}
c5aa993b JM	319	else
	320	{
	321	args = ntohs (args & 0xffff);
	322	if (args & 0x2000)
	323	args \|= 0xc000;
c906108c	324	}
c5aa993b JM	325	}
	326	else
	327	{
	328	args = args & 0xff;
	329	if (args & 0x40)
	330	args \|= 0x80;
	331	}
	332	argp += args;
	333	continue;
	334	}
	335	if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */
	336	return (1);
	337	else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */
	338	return (2);
	339	else if ((inst & 0xfffc) == 0xa57c)
	340	{ /* adjsp[bwd] */
	341	switch (inst & 3)
	342	{
	343	case 0:
	344	args = ((args & 0xff) + 0x80);
	345	break;
	346	case 1:
	347	args = ((ntohs (args) & 0xffff) + 0x8000);
	348	break;
	349	case 3:
	350	args = -ntohl (args);
	351	break;
	352	default:
	353	return (-1);
	354	}
	355	if (args / 4 > 10 \|\| (args & 3) != 0)
	356	continue;
	357	return (args / 4);
c906108c	358	}
c5aa993b JM	359	argp += 1;
	360	}
	361	return (-1);
c906108c	362	}