[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., 675 Mass Ave, Cambridge, MA 02139, 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 <sys/stat.h>

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

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

#ifndef NO_SYS_REG_H
#include <sys/reg.h>
#endif

#include "floatformat.h"

#include "target.h"

\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 (blockend, regnum)
     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 (status, ep)
     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 ()
{
  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 (regno)
     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 (regno)
     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 (regno)
     int regno;
{
  char buf[80];
  extern char registers[];
  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 (regno)
     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,
};

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;	/* 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");
    }
}
Commit	Line	Data
ecee7d0c JK	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., 675 Mass Ave, Cambridge, MA 02139, USA. */
	19
	20	#include "defs.h"
	21	#include "frame.h"
	22	#include "inferior.h"
	23	#include "language.h"
	24	#include "gdbcore.h"
	25
	26	#ifdef USG
	27	#include <sys/types.h>
	28	#endif
	29
	30	#include <sys/param.h>
	31	#include <sys/dir.h>
	32	#include <signal.h>
	33	#include <sys/user.h>
	34	#include <sys/ioctl.h>
	35	#include <fcntl.h>
	36
	37	#include <sys/file.h>
	38	#include <sys/stat.h>
	39
	40	#include <stddef.h>
	41	#include <sys/ptrace.h>
	42
	43	/* Does AIX define this in <errno.h>? */
	44	extern int errno;
	45
	46	#ifndef NO_SYS_REG_H
	47	#include <sys/reg.h>
	48	#endif
	49
48792545	50	#include "floatformat.h"
ecee7d0c JK	51
	52	#include "target.h"
	53
ecee7d0c JK	54	\f
	55	/* this table must line up with REGISTER_NAMES in tm-i386v.h */
	56	/* symbols like 'EAX' come from <sys/reg.h> */
	57	static int regmap[] =
	58	{
	59	EAX, ECX, EDX, EBX,
	60	USP, EBP, ESI, EDI,
	61	EIP, EFL, CS, SS,
	62	DS, ES, FS, GS,
	63	};
	64
	65	/* blockend is the value of u.u_ar0, and points to the
	66	* place where GS is stored
	67	*/
	68
	69	int
	70	i386_register_u_addr (blockend, regnum)
	71	int blockend;
	72	int regnum;
	73	{
	74	#if 0
	75	/* this will be needed if fp registers are reinstated */
	76	/* for now, you can look at them with 'info float'
	77	* sys5 wont let you change them with ptrace anyway
	78	*/
	79	if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
	80	{
	81	int ubase, fpstate;
	82	struct user u;
	83	ubase = blockend + 4 * (SS + 1) - KSTKSZ;
	84	fpstate = ubase + ((char )&u.u_fpstate - (char )&u);
	85	return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
	86	}
	87	else
	88	#endif
	89	return (blockend + 4 * regmap[regnum]);
	90
	91	}
	92
	93	/* The code below only work on the aix ps/2 (i386-ibm-aix) -
	94	* mtranle@paris - Sat Apr 11 10:34:12 1992
	95	*/
	96
	97	struct env387
	98	{
	99	unsigned short control;
	100	unsigned short r0;
	101	unsigned short status;
	102	unsigned short r1;
	103	unsigned short tag;
	104	unsigned short r2;
	105	unsigned long eip;
	106	unsigned short code_seg;
	107	unsigned short opcode;
	108	unsigned long operand;
	109	unsigned short operand_seg;
	110	unsigned short r3;
	111	unsigned char regs[8][10];
	112	};
	113
	114	static
	115	print_387_status (status, ep)
	116	unsigned short status;
	117	struct env387 *ep;
118	{
119	int i;
120	int bothstatus;
121	int top;
122	int fpreg;
123	unsigned char *p;
124
125	bothstatus = ((status != 0) && (ep->status != 0));
126	if (status != 0)
127	{
128	if (bothstatus)
199b2450	129	printf_unfiltered ("u: ");
ecee7d0c JK	130	print_387_status_word (status);
	131	}
	132
	133	if (ep->status != 0)
	134	{
	135	if (bothstatus)
199b2450	136	printf_unfiltered ("e: ");
ecee7d0c JK	137	print_387_status_word (ep->status);
	138	}
	139
	140	print_387_control_word (ep->control);
199b2450 TL	141	printf_unfiltered ("last exception: ");
	142	printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
	143	printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
	144	printf_unfiltered ("%s; ", local_hex_string(ep->eip));
	145	printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
	146	printf_unfiltered (":%s\n", local_hex_string(ep->operand));
dfd4c728 JK	147
	148	top = ((ep->status >> 11) & 7);
	149
199b2450	150	printf_unfiltered ("regno tag msb lsb value\n");
ecee7d0c JK	151	for (fpreg = 7; fpreg >= 0; fpreg--)
	152	{
	153	double val;
dfd4c728	154
199b2450	155	printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
dfd4c728	156
ecee7d0c JK	157	switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
ecee7d0c JK	158	{
199b2450 TL	159	case 0: printf_unfiltered ("valid "); break;
	160	case 1: printf_unfiltered ("zero "); break;
	161	case 2: printf_unfiltered ("trap "); break;
	162	case 3: printf_unfiltered ("empty "); break;
ecee7d0c JK	163	}
ecee7d0c JK	164	for (i = 9; i >= 0; i--)
199b2450	165	printf_unfiltered ("%02x", ep->regs[fpreg][i]);
ecee7d0c JK	166
ecee7d0c JK	167	i387_to_double ((char )ep->regs[fpreg], (char )&val);
199b2450	168	printf_unfiltered (" %#g\n", val);
ecee7d0c JK	169	}
	170	}
	171
	172	static struct env387 core_env387;
	173
	174	void
	175	i386_float_info ()
	176	{
	177	struct env387 fps;
	178	int fpsaved = 0;
dfd4c728 JK	179	/* We need to reverse the order of the registers. Apparently AIX stores
	180	the highest-numbered ones first. */
	181	struct env387 fps_fixed;
	182	int i;
ecee7d0c JK	183
	184	if (inferior_pid)
	185	{
	186	char buf[10];
	187	unsigned short status;
	188
	189	ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
	190	memcpy (&status, buf, sizeof (status));
	191	fpsaved = status;
	192	}
	193	else
	194	{
	195	if ((fpsaved = core_env387.status) != 0)
	196	memcpy(&fps, &core_env387, sizeof(fps));
	197	}
	198
	199	if (fpsaved == 0)
	200	{
199b2450	201	printf_unfiltered ("no floating point status saved\n");
ecee7d0c JK	202	return;
	203	}
	204
	205	if (inferior_pid)
	206	{
	207	int offset;
	208	for (offset = 0; offset < sizeof(fps); offset += 10)
	209	{
	210	char buf[10];
	211	ptrace (PT_READ_FPR, inferior_pid, buf, offset);
	212	memcpy ((char *)&fps.control + offset, buf,
	213	MIN(10, sizeof(fps) - offset));
	214	}
	215	}
dfd4c728 JK	216	fps_fixed = fps;
	217	for (i = 0; i < 8; ++i)
	218	memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
	219	print_387_status (0, &fps_fixed);
ecee7d0c JK	220	}
	221
	222	/* Fetch one register. */
	223	static void
	224	fetch_register (regno)
	225	int regno;
	226	{
	227	char buf[MAX_REGISTER_RAW_SIZE];
	228	if (regno < FP0_REGNUM)
	229	(int )buf = ptrace (PT_READ_GPR, inferior_pid,
	230	PT_REG(regmap[regno]), 0, 0);
	231	else
	232	ptrace (PT_READ_FPR, inferior_pid, buf,
	233	(regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
	234	supply_register (regno, buf);
	235	}
	236
	237	void
	238	fetch_inferior_registers (regno)
	239	int regno;
	240	{
	241	if (regno < 0)
	242	for (regno = 0; regno < NUM_REGS; regno++)
	243	fetch_register (regno);
	244	else
	245	fetch_register (regno);
	246	}
	247
	248	/* store one register */
	249	static void
	250	store_register (regno)
	251	int regno;
	252	{
	253	char buf[80];
	254	extern char registers[];
	255	errno = 0;
	256	if (regno < FP0_REGNUM)
	257	ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
	258	(int ) &registers[REGISTER_BYTE (regno)], 0);
	259	else
	260	ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
	261	(regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
	262
	263	if (errno != 0)
	264	{
	265	sprintf (buf, "writing register number %d", regno);
	266	perror_with_name (buf);
	267	}
	268	}
	269
	270	/* Store our register values back into the inferior.
	271	If REGNO is -1, do this for all registers.
	272	Otherwise, REGNO specifies which register (so we can save time). */
	273	void
	274	store_inferior_registers (regno)
	275	int regno;
	276	{
	277	if (regno < 0)
	278	for (regno = 0; regno < NUM_REGS; regno++)
	279	store_register (regno);
	280	else
	281	store_register (regno);
	282	}
	283
284	#ifndef CD_AX /* defined in sys/i386/coredump.h */
285	# define CD_AX 0
286	# define CD_BX 1
287	# define CD_CX 2
288	# define CD_DX 3
289	# define CD_SI 4
290	# define CD_DI 5
291	# define CD_BP 6
292	# define CD_SP 7
293	# define CD_FL 8
294	# define CD_IP 9
295	# define CD_CS 10
296	# define CD_DS 11
297	# define CD_ES 12
298	# define CD_FS 13
299	# define CD_GS 14
300	# define CD_SS 15
301	#endif
302
303	/*
304	* The order here in core_regmap[] has to be the same as in
305	* regmap[] above.
306	*/
307	static int core_regmap[] =
308	{
309	CD_AX, CD_CX, CD_DX, CD_BX,
310	CD_SP, CD_BP, CD_SI, CD_DI,
311	CD_IP, CD_FL, CD_CS, CD_SS,
312	CD_DS, CD_ES, CD_FS, CD_GS,
313	};
314
315	void
316	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
317	char *core_reg_sect;
318	unsigned core_reg_size;
319	int which;
320	unsigned int reg_addr; /* ignored */
321	{
322
323	if (which == 0)
324	{
325	/* Integer registers */
326
327	#define cd_regs(n) ((int *)core_reg_sect)[n]
328	#define regs(n) ((int ) &registers[REGISTER_BYTE (n)])
329
330	int i;
331	for (i = 0; i < FP0_REGNUM; i++)
332	regs(i) = cd_regs(core_regmap[i]);
333	}
334	else if (which == 2)
335	{
336	/* Floating point registers */
337
338	if (core_reg_size >= sizeof (core_env387))
339	memcpy (&core_env387, core_reg_sect, core_reg_size);
340	else
199b2450	341	fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
ecee7d0c JK	342	}
ecee7d0c JK	343	}