[deliverable/binutils-gdb.git] / gdb / i386aix-nat.c

/* Intel 386 native support.
   Copyright (C) 1988, 1989, 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 "language.h"
#include "gdbcore.h"

#ifdef USG
#include <sys/types.h>
#endif

#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>

#include <sys/file.h>
#include "gdb_stat.h"

#include <stddef.h>
#include <sys/ptrace.h>

/* Does AIX define this in <errno.h>?  */
extern int errno;

#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif

#include "floatformat.h"

#include "target.h"

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

/* this table must line up with REGISTER_NAMES in tm-i386v.h */
/* symbols like 'EAX' come from <sys/reg.h> */
static int regmap[] =
{
  EAX, ECX, EDX, EBX,
  USP, EBP, ESI, EDI,
  EIP, EFL, CS, SS,
  DS, ES, FS, GS,
};

/* blockend is the value of u.u_ar0, and points to the
 * place where GS is stored
 */

int
i386_register_u_addr (int blockend, int regnum)
{
#if 0
  /* this will be needed if fp registers are reinstated */
  /* for now, you can look at them with 'info float'
   * sys5 wont let you change them with ptrace anyway
   */
  if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
    {
      int ubase, fpstate;
      struct user u;
      ubase = blockend + 4 * (SS + 1) - KSTKSZ;
      fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u);
      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
    }
  else
#endif
    return (blockend + 4 * regmap[regnum]);

}

/* The code below only work on the aix ps/2 (i386-ibm-aix) -
 * mtranle@paris - Sat Apr 11 10:34:12 1992
 */

struct env387
{
  unsigned short control;
  unsigned short r0;
  unsigned short status;
  unsigned short r1;
  unsigned short tag;
  unsigned short r2;
  unsigned long eip;
  unsigned short code_seg;
  unsigned short opcode;
  unsigned long operand;
  unsigned short operand_seg;
  unsigned short r3;
  unsigned char regs[8][10];
};

static
print_387_status (unsigned short status, struct env387 *ep)
{
  int i;
  int bothstatus;
  int top;
  int fpreg;
  unsigned char *p;

  bothstatus = ((status != 0) && (ep->status != 0));
  if (status != 0)
    {
      if (bothstatus)
	printf_unfiltered ("u: ");
      print_387_status_word (status);
    }

  if (ep->status != 0)
    {
      if (bothstatus)
	printf_unfiltered ("e: ");
      print_387_status_word (ep->status);
    }

  print_387_control_word (ep->control);
  printf_unfiltered ("last exception: ");
  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
  printf_unfiltered ("%s; ", local_hex_string (ep->eip));
  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
  printf_unfiltered (":%s\n", local_hex_string (ep->operand));

  top = ((ep->status >> 11) & 7);

  printf_unfiltered ("regno  tag  msb              lsb  value\n");
  for (fpreg = 7; fpreg >= 0; fpreg--)
    {
      double val;

      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);

      switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
	{
	case 0:
	  printf_unfiltered ("valid ");
	  break;
	case 1:
	  printf_unfiltered ("zero  ");
	  break;
	case 2:
	  printf_unfiltered ("trap  ");
	  break;
	case 3:
	  printf_unfiltered ("empty ");
	  break;
	}
      for (i = 9; i >= 0; i--)
	printf_unfiltered ("%02x", ep->regs[fpreg][i]);

      i387_to_double ((char *) ep->regs[fpreg], (char *) &val);
      printf_unfiltered ("  %#g\n", val);
    }
}

static struct env387 core_env387;

void
i386_float_info (void)
{
  struct env387 fps;
  int fpsaved = 0;
  /* We need to reverse the order of the registers.  Apparently AIX stores
     the highest-numbered ones first.  */
  struct env387 fps_fixed;
  int i;

  if (inferior_pid)
    {
      char buf[10];
      unsigned short status;

      ptrace (PT_READ_FPR, inferior_pid, buf, offsetof (struct env387, status));
      memcpy (&status, buf, sizeof (status));
      fpsaved = status;
    }
  else
    {
      if ((fpsaved = core_env387.status) != 0)
	memcpy (&fps, &core_env387, sizeof (fps));
    }

  if (fpsaved == 0)
    {
      printf_unfiltered ("no floating point status saved\n");
      return;
    }

  if (inferior_pid)
    {
      int offset;
      for (offset = 0; offset < sizeof (fps); offset += 10)
	{
	  char buf[10];
	  ptrace (PT_READ_FPR, inferior_pid, buf, offset);
	  memcpy ((char *) &fps.control + offset, buf,
		  MIN (10, sizeof (fps) - offset));
	}
    }
  fps_fixed = fps;
  for (i = 0; i < 8; ++i)
    memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
  print_387_status (0, &fps_fixed);
}

/* Fetch one register.  */
static void
fetch_register (int regno)
{
  char buf[MAX_REGISTER_RAW_SIZE];
  if (regno < FP0_REGNUM)
    *(int *) buf = ptrace (PT_READ_GPR, inferior_pid,
			   PT_REG (regmap[regno]), 0, 0);
  else
    ptrace (PT_READ_FPR, inferior_pid, buf,
	    (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
  supply_register (regno, buf);
}

void
fetch_inferior_registers (int regno)
{
  if (regno < 0)
    for (regno = 0; regno < NUM_REGS; regno++)
      fetch_register (regno);
  else
    fetch_register (regno);
}

/* store one register */
static void
store_register (int regno)
{
  char buf[80];
  errno = 0;
  if (regno < FP0_REGNUM)
    ptrace (PT_WRITE_GPR, inferior_pid, PT_REG (regmap[regno]),
	    *(int *) &registers[REGISTER_BYTE (regno)], 0);
  else
    ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
	    (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));

  if (errno != 0)
    {
      sprintf (buf, "writing register number %d", regno);
      perror_with_name (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 (int regno)
{
  if (regno < 0)
    for (regno = 0; regno < NUM_REGS; regno++)
      store_register (regno);
  else
    store_register (regno);
}

#ifndef CD_AX			/* defined in sys/i386/coredump.h */
#define CD_AX	0
#define CD_BX	1
#define CD_CX	2
#define CD_DX	3
#define CD_SI	4
#define CD_DI	5
#define CD_BP	6
#define CD_SP	7
#define CD_FL	8
#define CD_IP	9
#define CD_CS	10
#define CD_DS	11
#define CD_ES	12
#define CD_FS	13
#define CD_GS	14
#define CD_SS	15
#endif

/*
 * The order here in core_regmap[] has to be the same as in 
 * regmap[] above.
 */
static int core_regmap[] =
{
  CD_AX, CD_CX, CD_DX, CD_BX,
  CD_SP, CD_BP, CD_SI, CD_DI,
  CD_IP, CD_FL, CD_CS, CD_SS,
  CD_DS, CD_ES, CD_FS, CD_GS,
};

static void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
     CORE_ADDR reg_addr;	/* ignored */
{

  if (which == 0)
    {
      /* Integer registers */

#define cd_regs(n) ((int *)core_reg_sect)[n]
#define regs(n) *((int *) &registers[REGISTER_BYTE (n)])

      int i;
      for (i = 0; i < FP0_REGNUM; i++)
	regs (i) = cd_regs (core_regmap[i]);
    }
  else if (which == 2)
    {
      /* Floating point registers */

      if (core_reg_size >= sizeof (core_env387))
	memcpy (&core_env387, core_reg_sect, core_reg_size);
      else
	fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
    }
}
\f

/* Register that we are able to handle i386aix core file formats.
   FIXME: is this really bfd_target_unknown_flavour? */

static struct core_fns i386aix_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_i386aix (void)
{
  add_core_fns (&i386aix_core_fns);
}
Commit	Line	Data
	1	/* Intel 386 native support.
	2	Copyright (C) 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
	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.
	10
	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.
	15
	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. */
	20
	21	#include "defs.h"
	22	#include "frame.h"
	23	#include "inferior.h"
	24	#include "language.h"
	25	#include "gdbcore.h"
	26
	27	#ifdef USG
	28	#include <sys/types.h>
	29	#endif
	30
	31	#include <sys/param.h>
	32	#include <sys/dir.h>
	33	#include <signal.h>
	34	#include <sys/user.h>
	35	#include <sys/ioctl.h>
	36	#include <fcntl.h>
	37
	38	#include <sys/file.h>
	39	#include "gdb_stat.h"
	40
	41	#include <stddef.h>
	42	#include <sys/ptrace.h>
	43
	44	/* Does AIX define this in <errno.h>? */
	45	extern int errno;
	46
	47	#ifdef HAVE_SYS_REG_H
	48	#include <sys/reg.h>
	49	#endif
	50
	51	#include "floatformat.h"
	52
	53	#include "target.h"
	54
	55	static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
	56	\f
	57
	58	/* this table must line up with REGISTER_NAMES in tm-i386v.h */
	59	/* symbols like 'EAX' come from <sys/reg.h> */
	60	static int regmap[] =
	61	{
	62	EAX, ECX, EDX, EBX,
	63	USP, EBP, ESI, EDI,
	64	EIP, EFL, CS, SS,
	65	DS, ES, FS, GS,
	66	};
	67
	68	/* blockend is the value of u.u_ar0, and points to the
	69	* place where GS is stored
	70	*/
	71
	72	int
	73	i386_register_u_addr (int blockend, int regnum)
	74	{
	75	#if 0
	76	/* this will be needed if fp registers are reinstated */
	77	/* for now, you can look at them with 'info float'
	78	* sys5 wont let you change them with ptrace anyway
	79	*/
	80	if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
	81	{
	82	int ubase, fpstate;
	83	struct user u;
	84	ubase = blockend + 4 * (SS + 1) - KSTKSZ;
	85	fpstate = ubase + ((char ) &u.u_fpstate - (char ) &u);
	86	return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
	87	}
	88	else
	89	#endif
	90	return (blockend + 4 * regmap[regnum]);
	91
	92	}
	93
	94	/* The code below only work on the aix ps/2 (i386-ibm-aix) -
	95	* mtranle@paris - Sat Apr 11 10:34:12 1992
	96	*/
	97
	98	struct env387
	99	{
	100	unsigned short control;
	101	unsigned short r0;
	102	unsigned short status;
	103	unsigned short r1;
	104	unsigned short tag;
	105	unsigned short r2;
	106	unsigned long eip;
	107	unsigned short code_seg;
	108	unsigned short opcode;
	109	unsigned long operand;
	110	unsigned short operand_seg;
	111	unsigned short r3;
	112	unsigned char regs[8][10];
	113	};
	114
	115	static
	116	print_387_status (unsigned short status, struct env387 *ep)
	117	{
	118	int i;
	119	int bothstatus;
	120	int top;
	121	int fpreg;
	122	unsigned char *p;
	123
	124	bothstatus = ((status != 0) && (ep->status != 0));
	125	if (status != 0)
	126	{
	127	if (bothstatus)
	128	printf_unfiltered ("u: ");
	129	print_387_status_word (status);
	130	}
	131
	132	if (ep->status != 0)
	133	{
	134	if (bothstatus)
	135	printf_unfiltered ("e: ");
	136	print_387_status_word (ep->status);
	137	}
	138
	139	print_387_control_word (ep->control);
	140	printf_unfiltered ("last exception: ");
	141	printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
	142	printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
	143	printf_unfiltered ("%s; ", local_hex_string (ep->eip));
	144	printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
	145	printf_unfiltered (":%s\n", local_hex_string (ep->operand));
	146
	147	top = ((ep->status >> 11) & 7);
	148
	149	printf_unfiltered ("regno tag msb lsb value\n");
	150	for (fpreg = 7; fpreg >= 0; fpreg--)
	151	{
	152	double val;
	153
	154	printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
	155
	156	switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
	157	{
	158	case 0:
	159	printf_unfiltered ("valid ");
	160	break;
	161	case 1:
	162	printf_unfiltered ("zero ");
	163	break;
	164	case 2:
	165	printf_unfiltered ("trap ");
	166	break;
	167	case 3:
	168	printf_unfiltered ("empty ");
	169	break;
	170	}
	171	for (i = 9; i >= 0; i--)
	172	printf_unfiltered ("%02x", ep->regs[fpreg][i]);
	173
	174	i387_to_double ((char ) ep->regs[fpreg], (char ) &val);
	175	printf_unfiltered (" %#g\n", val);
	176	}
	177	}
	178
	179	static struct env387 core_env387;
	180
	181	void
	182	i386_float_info (void)
	183	{
	184	struct env387 fps;
	185	int fpsaved = 0;
	186	/* We need to reverse the order of the registers. Apparently AIX stores
	187	the highest-numbered ones first. */
	188	struct env387 fps_fixed;
	189	int i;
	190
	191	if (inferior_pid)
	192	{
	193	char buf[10];
	194	unsigned short status;
	195
	196	ptrace (PT_READ_FPR, inferior_pid, buf, offsetof (struct env387, status));
	197	memcpy (&status, buf, sizeof (status));
	198	fpsaved = status;
	199	}
	200	else
	201	{
	202	if ((fpsaved = core_env387.status) != 0)
	203	memcpy (&fps, &core_env387, sizeof (fps));
	204	}
	205
	206	if (fpsaved == 0)
	207	{
	208	printf_unfiltered ("no floating point status saved\n");
	209	return;
	210	}
	211
	212	if (inferior_pid)
	213	{
	214	int offset;
	215	for (offset = 0; offset < sizeof (fps); offset += 10)
	216	{
	217	char buf[10];
	218	ptrace (PT_READ_FPR, inferior_pid, buf, offset);
	219	memcpy ((char *) &fps.control + offset, buf,
	220	MIN (10, sizeof (fps) - offset));
	221	}
	222	}
	223	fps_fixed = fps;
	224	for (i = 0; i < 8; ++i)
	225	memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
	226	print_387_status (0, &fps_fixed);
	227	}
	228
	229	/* Fetch one register. */
	230	static void
	231	fetch_register (int regno)
	232	{
	233	char buf[MAX_REGISTER_RAW_SIZE];
	234	if (regno < FP0_REGNUM)
	235	(int ) buf = ptrace (PT_READ_GPR, inferior_pid,
	236	PT_REG (regmap[regno]), 0, 0);
	237	else
	238	ptrace (PT_READ_FPR, inferior_pid, buf,
	239	(regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
	240	supply_register (regno, buf);
	241	}
	242
	243	void
	244	fetch_inferior_registers (int regno)
	245	{
	246	if (regno < 0)
	247	for (regno = 0; regno < NUM_REGS; regno++)
	248	fetch_register (regno);
	249	else
	250	fetch_register (regno);
	251	}
	252
	253	/* store one register */
	254	static void
	255	store_register (int regno)
	256	{
	257	char buf[80];
	258	errno = 0;
	259	if (regno < FP0_REGNUM)
	260	ptrace (PT_WRITE_GPR, inferior_pid, PT_REG (regmap[regno]),
	261	(int ) &registers[REGISTER_BYTE (regno)], 0);
	262	else
	263	ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
	264	(regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
	265
	266	if (errno != 0)
	267	{
	268	sprintf (buf, "writing register number %d", regno);
	269	perror_with_name (buf);
	270	}
	271	}
	272
	273	/* Store our register values back into the inferior.
	274	If REGNO is -1, do this for all registers.
	275	Otherwise, REGNO specifies which register (so we can save time). */
	276	void
	277	store_inferior_registers (int regno)
	278	{
	279	if (regno < 0)
	280	for (regno = 0; regno < NUM_REGS; regno++)
	281	store_register (regno);
	282	else
	283	store_register (regno);
	284	}
	285
	286	#ifndef CD_AX /* defined in sys/i386/coredump.h */
	287	#define CD_AX 0
	288	#define CD_BX 1
	289	#define CD_CX 2
	290	#define CD_DX 3
	291	#define CD_SI 4
	292	#define CD_DI 5
	293	#define CD_BP 6
	294	#define CD_SP 7
	295	#define CD_FL 8
	296	#define CD_IP 9
	297	#define CD_CS 10
	298	#define CD_DS 11
	299	#define CD_ES 12
	300	#define CD_FS 13
	301	#define CD_GS 14
	302	#define CD_SS 15
	303	#endif
	304
	305	/*
	306	* The order here in core_regmap[] has to be the same as in
	307	* regmap[] above.
	308	*/
	309	static int core_regmap[] =
	310	{
	311	CD_AX, CD_CX, CD_DX, CD_BX,
	312	CD_SP, CD_BP, CD_SI, CD_DI,
	313	CD_IP, CD_FL, CD_CS, CD_SS,
	314	CD_DS, CD_ES, CD_FS, CD_GS,
	315	};
	316
	317	static void
	318	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
	319	char *core_reg_sect;
	320	unsigned core_reg_size;
	321	int which;
	322	CORE_ADDR reg_addr; /* ignored */
	323	{
	324
	325	if (which == 0)
	326	{
	327	/* Integer registers */
	328
	329	#define cd_regs(n) ((int *)core_reg_sect)[n]
	330	#define regs(n) ((int ) &registers[REGISTER_BYTE (n)])
	331
	332	int i;
	333	for (i = 0; i < FP0_REGNUM; i++)
	334	regs (i) = cd_regs (core_regmap[i]);
	335	}
	336	else if (which == 2)
	337	{
	338	/* Floating point registers */
	339
	340	if (core_reg_size >= sizeof (core_env387))
	341	memcpy (&core_env387, core_reg_sect, core_reg_size);
	342	else
	343	fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
	344	}
	345	}
	346	\f
	347
	348	/* Register that we are able to handle i386aix core file formats.
	349	FIXME: is this really bfd_target_unknown_flavour? */
	350
	351	static struct core_fns i386aix_core_fns =
	352	{
	353	bfd_target_unknown_flavour, /* core_flavour */
	354	default_check_format, /* check_format */
	355	default_core_sniffer, /* core_sniffer */
	356	fetch_core_registers, /* core_read_registers */
	357	NULL /* next */
	358	};
	359
	360	void
	361	_initialize_core_i386aix (void)
	362	{
	363	add_core_fns (&i386aix_core_fns);
	364	}