[deliverable/binutils-gdb.git] / gdb / i386lynx-nat.c

/* Native-dependent code for Lynx running on i386's, for GDB.
   Copyright 1988, 1989, 1991, 1992, 1993
   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 "target.h"

#include <sys/ptrace.h>
#include "/usr/include/sys/wait.h"

/* these values indicate the offset of the named register in the econtext
   structure */

#define	EAX	10
#define	ECX	9
#define	EDX	8
#define	EBX	7
#define	ESP	16
#define	EBP	5
#define	ESI	4
#define	EDI	3
#define	EIP	13
#define	EFL	15
#define	CS	14
#define	SS	17
#define	DS	2
#define	ES	1

/* Currently these are not being used. So set them to 0 */

#define	FS	0
#define	GS	0

/* this table must line up with REGISTER_NAMES in m-i386.h */
static unsigned int regmap[] = 
{
  EAX, ECX, EDX, EBX,
  ESP, EBP, ESI, EDI,
  EIP, EFL, CS, SS,
  DS, ES, FS, GS,
};

/* Return the address in the core dump or inferior of register REGNO.
   BLOCKEND is the address of the econtext structure */

static unsigned int
register_addr (regno, blockend)
     int regno, blockend;
{
  if (regno < 0 || regno >= NUM_REGS)
    error ("Invalid register number %d.", regno);

  return (blockend + regmap[regno] * sizeof (long));
}

/* Fetch one register.  */

static void
fetch_register (regno, offset, bpid)
     int regno, bpid;
     unsigned int offset;
{
  unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  char mess[128];				/* For messages */
  int i;

  regaddr = register_addr (regno, offset);
  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
    {
      errno = 0;
      *(int *) &buf[i] = ptrace (PTRACE_PEEKTHREAD, bpid,
				 (PTRACE_ARG3_TYPE) regaddr, 0);
      regaddr += sizeof (int);
      if (errno != 0)
	{
	  sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
	  perror_with_name (mess);
	}
    }
  supply_register (regno, 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).  */

static void
store_register (regno, offset, bpid)
     int regno, bpid;
     unsigned int offset;
{
  unsigned int regaddr;
  char mess[128];
  extern char registers[];
  int i;

  regaddr = register_addr (regno, offset);
  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
    {
      errno = 0;
      ptrace (PTRACE_POKEUSER, bpid, (PTRACE_ARG3_TYPE) regaddr,
	      *(int *) &registers[REGISTER_BYTE (regno) + i]);
      if (errno != 0)
        {  
	  sprintf (mess, "writing register number %d(%d)", regno, i);
	  perror_with_name (mess);
        }
      regaddr += sizeof(int);
    }
}

/* return an offset for use with register_addr() */

static unsigned int
fetch_offset (pid)
    int pid;
{
  struct st_entry s;
  unsigned int specpage_off, offset = (char *) &s.ecp - (char *) &s;

  errno = 0;
  specpage_off = ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0);
  if (errno != 0)
    perror_with_name ("ptrace");
  errno = 0;
  offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0)
      - specpage_off;
  if (errno != 0)
    perror_with_name ("ptrace");
  return offset;
}

/* Fetch all registers, or just one, from the child process.  */

void
fetch_inferior_registers (regno)
     int regno;
{
  unsigned int offset = fetch_offset (inferior_pid);

  if (regno == -1)
    {
      for (regno = 0; regno < NUM_REGS; regno++)
        fetch_register (regno, offset, inferior_pid);
    }
  else
    fetch_register (regno, offset, inferior_pid);
}

/* Store all registers, or just one, to the child process.  */

void
store_inferior_registers (regno)
     int regno;
{
    unsigned int offset = fetch_offset (inferior_pid);

    if (regno == -1)
      {
        for (regno = 0; regno < NUM_REGS; regno++)
	  store_register (regno, offset, inferior_pid);
      }
    else
      store_register (regno, offset, inferior_pid);
}

/* Wait for child to do something.  Return pid of child, or -1 in case
   of error; store status through argument pointer STATUS.  */

int
child_wait (status)
     int *status;
{
  int pid;
  int save_errno;
  int thread;

  while (1)
    {
      int sig;

      if (attach_flag)
	set_sigint_trap();	/* Causes SIGINT to be passed on to the
				   attached process. */
      pid = wait (status);
      save_errno = errno;

      if (attach_flag)
	clear_sigint_trap();

      if (pid == -1)
	{
	  if (save_errno == EINTR)
	    continue;
	  fprintf (stderr, "Child process unexpectedly missing: %s.\n",
		   safe_strerror (save_errno));
	  *status = 42;		/* Claim it exited with signal 42 */
	  return -1;
	}

      if (pid != PIDGET (inferior_pid))	/* Some other process?!? */
	continue;

/*      thread = WIFTID (*status);*/
      thread = *status >> 16;

      /* Initial thread value can only be acquired via wait, so we have to
	 resort to this hack.  */

      if (TIDGET (inferior_pid) == 0)
	{
	  inferior_pid = BUILDPID (inferior_pid, thread);
	  add_thread (inferior_pid);
	}

      pid = BUILDPID (pid, thread);

      return pid;
    }
}

/* Convert a Lynx process ID to a string.  Returns the string in a static
   buffer.  */

char *
i386lynx_pid_to_str (pid)
     int pid;
{
  static char buf[40];

  sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));

  return buf;
}

/* Extract the register values out of the core file and store
   them where `read_register' will find them.

   CORE_REG_SECT points to the register values themselves, read into memory.
   CORE_REG_SIZE is the size of that area.
   WHICH says which set of registers we are handling (0 = int, 2 = float
         on machines where they are discontiguous).
   REG_ADDR is the offset from u.u_ar0 to the register values relative to
            core_reg_sect.  This is used with old-fashioned core files to
	    locate the registers in a large upage-plus-stack ".reg" section.
	    Original upage address X is at location core_reg_sect+x+reg_addr.
 */

void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
     unsigned reg_addr;
{
  struct st_entry s;
  unsigned int regno, addr;

  for (regno = 0; regno < NUM_REGS; regno++)
    {
      addr = register_addr (regno, (char *) &s.ec - (char *) &s);
      supply_register (regno, core_reg_sect + addr);
    }
}
Commit	Line	Data
25286543	1	/* Native-dependent code for Lynx running on i386's, for GDB.
da0baf42 SG	2	Copyright 1988, 1989, 1991, 1992, 1993
da0baf42 SG	3	Free Software Foundation, Inc.
25286543 SG	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	20
	21	#include "defs.h"
	22	#include "frame.h"
	23	#include "inferior.h"
25286543 SG	24	#include "target.h"
	25
	26	#include <sys/ptrace.h>
	27	#include "/usr/include/sys/wait.h"
	28
	29	/* these values indicate the offset of the named register in the econtext
	30	structure */
	31
	32	#define EAX 10
	33	#define ECX 9
	34	#define EDX 8
	35	#define EBX 7
	36	#define ESP 16
	37	#define EBP 5
	38	#define ESI 4
	39	#define EDI 3
	40	#define EIP 13
	41	#define EFL 15
	42	#define CS 14
	43	#define SS 17
	44	#define DS 2
	45	#define ES 1
	46
	47	/* Currently these are not being used. So set them to 0 */
	48
	49	#define FS 0
	50	#define GS 0
	51
	52	/* this table must line up with REGISTER_NAMES in m-i386.h */
	53	static unsigned int regmap[] =
	54	{
	55	EAX, ECX, EDX, EBX,
	56	ESP, EBP, ESI, EDI,
	57	EIP, EFL, CS, SS,
	58	DS, ES, FS, GS,
	59	};
	60
	61	/* Return the address in the core dump or inferior of register REGNO.
	62	BLOCKEND is the address of the econtext structure */
	63
	64	static unsigned int
	65	register_addr (regno, blockend)
	66	int regno, blockend;
	67	{
	68	if (regno < 0 \|\| regno >= NUM_REGS)
	69	error ("Invalid register number %d.", regno);
	70
	71	return (blockend + regmap[regno] * sizeof (long));
	72	}
	73
	74	/* Fetch one register. */
	75
	76	static void
	77	fetch_register (regno, offset, bpid)
	78	int regno, bpid;
	79	unsigned int offset;
	80	{
	81	unsigned int regaddr;
	82	char buf[MAX_REGISTER_RAW_SIZE];
	83	char mess[128]; /* For messages */
	84	int i;
	85
	86	regaddr = register_addr (regno, offset);
	87	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
88	{
89	errno = 0;
90	(int ) &buf[i] = ptrace (PTRACE_PEEKTHREAD, bpid,
91	(PTRACE_ARG3_TYPE) regaddr, 0);
92	regaddr += sizeof (int);
93	if (errno != 0)
94	{
95	sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
96	perror_with_name (mess);
97	}
98	}
99	supply_register (regno, buf);
100	}
101
102	/* Store our register values back into the inferior.
103	If REGNO is -1, do this for all registers.
104	Otherwise, REGNO specifies which register (so we can save time). */
105
106	static void
107	store_register (regno, offset, bpid)
108	int regno, bpid;
109	unsigned int offset;
110	{
111	unsigned int regaddr;
112	char mess[128];
113	extern char registers[];
114	int i;
115
116	regaddr = register_addr (regno, offset);
117	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
118	{
119	errno = 0;
120	ptrace (PTRACE_POKEUSER, bpid, (PTRACE_ARG3_TYPE) regaddr,
121	(int ) &registers[REGISTER_BYTE (regno) + i]);
122	if (errno != 0)
123	{
124	sprintf (mess, "writing register number %d(%d)", regno, i);
125	perror_with_name (mess);
126	}
127	regaddr += sizeof(int);
128	}
129	}
130
131	/* return an offset for use with register_addr() */
132
133	static unsigned int
134	fetch_offset (pid)
135	int pid;
136	{
137	struct st_entry s;
138	unsigned int specpage_off, offset = (char ) &s.ecp - (char ) &s;
139
140	errno = 0;
141	specpage_off = ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0);
142	if (errno != 0)
143	perror_with_name ("ptrace");
144	errno = 0;
145	offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0)
146	- specpage_off;
147	if (errno != 0)
148	perror_with_name ("ptrace");
149	return offset;
150	}
151
152	/* Fetch all registers, or just one, from the child process. */
153
154	void
155	fetch_inferior_registers (regno)
156	int regno;
157	{
158	unsigned int offset = fetch_offset (inferior_pid);
159
160	if (regno == -1)
161	{
162	for (regno = 0; regno < NUM_REGS; regno++)
163	fetch_register (regno, offset, inferior_pid);
164	}
165	else
166	fetch_register (regno, offset, inferior_pid);
167	}
168
169	/* Store all registers, or just one, to the child process. */
170
171	void
172	store_inferior_registers (regno)
173	int regno;
174	{
175	unsigned int offset = fetch_offset (inferior_pid);
176
177	if (regno == -1)
178	{
179	for (regno = 0; regno < NUM_REGS; regno++)
180	store_register (regno, offset, inferior_pid);
181	}
182	else
183	store_register (regno, offset, inferior_pid);
184	}
185
25286543 SG	186	/* Wait for child to do something. Return pid of child, or -1 in case
	187	of error; store status through argument pointer STATUS. */
	188
	189	int
	190	child_wait (status)
	191	int *status;
	192	{
	193	int pid;
	194	int save_errno;
	195	int thread;
	196
	197	while (1)
	198	{
	199	int sig;
	200
	201	if (attach_flag)
	202	set_sigint_trap(); /* Causes SIGINT to be passed on to the
	203	attached process. */
	204	pid = wait (status);
	205	save_errno = errno;
	206
	207	if (attach_flag)
	208	clear_sigint_trap();
	209
	210	if (pid == -1)
	211	{
	212	if (save_errno == EINTR)
	213	continue;
	214	fprintf (stderr, "Child process unexpectedly missing: %s.\n",
	215	safe_strerror (save_errno));
	216	status = 42; / Claim it exited with signal 42 */
	217	return -1;
	218	}
	219
	220	if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
	221	continue;
	222
	223	/* thread = WIFTID (status);/
	224	thread = *status >> 16;
	225
	226	/* Initial thread value can only be acquired via wait, so we have to
	227	resort to this hack. */
	228
	229	if (TIDGET (inferior_pid) == 0)
	230	{
	231	inferior_pid = BUILDPID (inferior_pid, thread);
	232	add_thread (inferior_pid);
	233	}
	234
	235	pid = BUILDPID (pid, thread);
	236
	237	return pid;
	238	}
	239	}
	240
25286543 SG	241	/* Convert a Lynx process ID to a string. Returns the string in a static
	242	buffer. */
	243
	244	char *
	245	i386lynx_pid_to_str (pid)
	246	int pid;
	247	{
	248	static char buf[40];
	249
	250	sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
	251
	252	return buf;
	253	}
b1eaba9a SG	254
	255	/* Extract the register values out of the core file and store
	256	them where `read_register' will find them.
	257
	258	CORE_REG_SECT points to the register values themselves, read into memory.
	259	CORE_REG_SIZE is the size of that area.
	260	WHICH says which set of registers we are handling (0 = int, 2 = float
	261	on machines where they are discontiguous).
	262	REG_ADDR is the offset from u.u_ar0 to the register values relative to
	263	core_reg_sect. This is used with old-fashioned core files to
	264	locate the registers in a large upage-plus-stack ".reg" section.
	265	Original upage address X is at location core_reg_sect+x+reg_addr.
	266	*/
	267
	268	void
	269	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
	270	char *core_reg_sect;
	271	unsigned core_reg_size;
	272	int which;
	273	unsigned reg_addr;
	274	{
	275	struct st_entry s;
	276	unsigned int regno, addr;
	277
	278	for (regno = 0; regno < NUM_REGS; regno++)
	279	{
	280	addr = register_addr (regno, (char ) &s.ec - (char ) &s);
	281	supply_register (regno, core_reg_sect + addr);
	282	}
	283	}