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

<<<<<<< 2.6 is dead >>>>>>>
/* 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 (pid, status)
     int pid;
     int *status;
{
  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_unfiltered (gdb_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
199b2450 TL	1	<<<<<<< 2.6 is dead >>>>>>>
	2	/* Native-dependent code for Lynx running on i386's, for GDB.
	3	Copyright 1988, 1989, 1991, 1992, 1993
	4	Free Software Foundation, Inc.
	5
	6	This file is part of GDB.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	21
	22	#include "defs.h"
	23	#include "frame.h"
	24	#include "inferior.h"
	25	#include "target.h"
	26
	27	#include <sys/ptrace.h>
	28	#include "/usr/include/sys/wait.h"
	29
	30	/* these values indicate the offset of the named register in the econtext
	31	structure */
	32
	33	#define EAX 10
	34	#define ECX 9
	35	#define EDX 8
	36	#define EBX 7
	37	#define ESP 16
	38	#define EBP 5
	39	#define ESI 4
	40	#define EDI 3
	41	#define EIP 13
	42	#define EFL 15
	43	#define CS 14
	44	#define SS 17
	45	#define DS 2
	46	#define ES 1
	47
	48	/* Currently these are not being used. So set them to 0 */
	49
	50	#define FS 0
	51	#define GS 0
	52
	53	/* this table must line up with REGISTER_NAMES in m-i386.h */
	54	static unsigned int regmap[] =
	55	{
	56	EAX, ECX, EDX, EBX,
	57	ESP, EBP, ESI, EDI,
	58	EIP, EFL, CS, SS,
	59	DS, ES, FS, GS,
	60	};
	61
	62	/* Return the address in the core dump or inferior of register REGNO.
	63	BLOCKEND is the address of the econtext structure */
	64
65	static unsigned int
66	register_addr (regno, blockend)
67	int regno, blockend;
68	{
69	if (regno < 0 \|\| regno >= NUM_REGS)
70	error ("Invalid register number %d.", regno);
71
72	return (blockend + regmap[regno] * sizeof (long));
73	}
74
75	/* Fetch one register. */
76
77	static void
78	fetch_register (regno, offset, bpid)
79	int regno, bpid;
80	unsigned int offset;
81	{
82	unsigned int regaddr;
83	char buf[MAX_REGISTER_RAW_SIZE];
84	char mess[128]; /* For messages */
85	int i;
86
87	regaddr = register_addr (regno, offset);
88	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
89	{
90	errno = 0;
91	(int ) &buf[i] = ptrace (PTRACE_PEEKTHREAD, bpid,
92	(PTRACE_ARG3_TYPE) regaddr, 0);
93	regaddr += sizeof (int);
94	if (errno != 0)
95	{
96	sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
97	perror_with_name (mess);
98	}
99	}
100	supply_register (regno, buf);
101	}
102
103	/* Store our register values back into the inferior.
104	If REGNO is -1, do this for all registers.
105	Otherwise, REGNO specifies which register (so we can save time). */
106
107	static void
108	store_register (regno, offset, bpid)
109	int regno, bpid;
110	unsigned int offset;
111	{
112	unsigned int regaddr;
113	char mess[128];
114	extern char registers[];
115	int i;
116
117	regaddr = register_addr (regno, offset);
118	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
119	{
120	errno = 0;
121	ptrace (PTRACE_POKEUSER, bpid, (PTRACE_ARG3_TYPE) regaddr,
122	(int ) &registers[REGISTER_BYTE (regno) + i]);
123	if (errno != 0)
124	{
125	sprintf (mess, "writing register number %d(%d)", regno, i);
126	perror_with_name (mess);
127	}
128	regaddr += sizeof(int);
129	}
130	}
131
132	/* return an offset for use with register_addr() */
133
134	static unsigned int
135	fetch_offset (pid)
136	int pid;
137	{
138	struct st_entry s;
139	unsigned int specpage_off, offset = (char ) &s.ecp - (char ) &s;
140
141	errno = 0;
142	specpage_off = ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE) 0, 0);
143	if (errno != 0)
144	perror_with_name ("ptrace");
145	errno = 0;
146	offset = ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE) offset, 0)
147	- specpage_off;
148	if (errno != 0)
149	perror_with_name ("ptrace");
150	return offset;
151	}
152
153	/* Fetch all registers, or just one, from the child process. */
154
155	void
156	fetch_inferior_registers (regno)
157	int regno;
158	{
159	unsigned int offset = fetch_offset (inferior_pid);
160
161	if (regno == -1)
162	{
163	for (regno = 0; regno < NUM_REGS; regno++)
164	fetch_register (regno, offset, inferior_pid);
165	}
166	else
167	fetch_register (regno, offset, inferior_pid);
168	}
169
170	/* Store all registers, or just one, to the child process. */
171
172	void
173	store_inferior_registers (regno)
174	int regno;
175	{
176	unsigned int offset = fetch_offset (inferior_pid);
177
178	if (regno == -1)
179	{
180	for (regno = 0; regno < NUM_REGS; regno++)
181	store_register (regno, offset, inferior_pid);
182	}
183	else
184	store_register (regno, offset, inferior_pid);
185	}
186
187	/* Wait for child to do something. Return pid of child, or -1 in case
188	of error; store status through argument pointer STATUS. */
189
190	int
191	child_wait (pid, status)
192	int pid;
193	int *status;
194	{
195	int save_errno;
196	int thread;
197
198	while (1)
199	{
200	int sig;
201
202	if (attach_flag)
203	set_sigint_trap(); /* Causes SIGINT to be passed on to the
204	attached process. */
205	pid = wait (status);
206	save_errno = errno;
207
208	if (attach_flag)
209	clear_sigint_trap();
210
211	if (pid == -1)
212	{
213	if (save_errno == EINTR)
214	continue;
215	fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
216	safe_strerror (save_errno));
217	status = 42; / Claim it exited with signal 42 */
218	return -1;
219	}
220
221	if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
222	continue;
223
224	/* thread = WIFTID (status);/
225	thread = *status >> 16;
226
227	/* Initial thread value can only be acquired via wait, so we have to
228	resort to this hack. */
229
230	if (TIDGET (inferior_pid) == 0)
231	{
232	inferior_pid = BUILDPID (inferior_pid, thread);
233	add_thread (inferior_pid);
234	}
235
236	pid = BUILDPID (pid, thread);
237
238	return pid;
239	}
240	}
241
242	/* Convert a Lynx process ID to a string. Returns the string in a static
243	buffer. */
244
245	char *
246	i386lynx_pid_to_str (pid)
247	int pid;
248	{
249	static char buf[40];
250
251	sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
252
253	return buf;
254	}
255
256	/* Extract the register values out of the core file and store
257	them where `read_register' will find them.
258
259	CORE_REG_SECT points to the register values themselves, read into memory.
260	CORE_REG_SIZE is the size of that area.
261	WHICH says which set of registers we are handling (0 = int, 2 = float
262	on machines where they are discontiguous).
263	REG_ADDR is the offset from u.u_ar0 to the register values relative to
264	core_reg_sect. This is used with old-fashioned core files to
265	locate the registers in a large upage-plus-stack ".reg" section.
266	Original upage address X is at location core_reg_sect+x+reg_addr.
267	*/
268
269	void
270	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
271	char *core_reg_sect;
272	unsigned core_reg_size;
273	int which;
274	unsigned reg_addr;
275	{
276	struct st_entry s;
277	unsigned int regno, addr;
278
279	for (regno = 0; regno < NUM_REGS; regno++)
280	{
281	addr = register_addr (regno, (char ) &s.ec - (char ) &s);
282	supply_register (regno, core_reg_sect + addr);
283	}
284	}