gdb/i386gnu-nat.c - binutils-gdb - Git at Google

 /* Low level interface to I386 running the GNU Hurd
    Copyright (C) 1992, 1995, 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 "defs.h"
 #include "inferior.h"
 #include "floatformat.h"

 #include <stdio.h>
 #include <errno.h>

 #include <mach.h>
 #include <mach/message.h>
 #include <mach/exception.h>
 #include <mach_error.h>

 #include "gnu-nat.h"

 /* Hmmm... Should this not be here?
  * Now for i386_float_info() target_has_execution
  */
 #include <target.h>

 /* @@@ Should move print_387_status() to i387-tdep.c */
 extern void print_387_control_word ();	/* i387-tdep.h */
 extern void print_387_status_word ();

 /* Find offsets to thread states at compile time.
  * If your compiler does not grok this, calculate offsets
  * offsets yourself and use them (or get a compatible compiler :-)
  */

 #define  REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)

 /* at reg_offset[i] is the offset to the i386_thread_state
  * location where the gdb registers[i] is stored.
  */

 static int reg_offset[] =
 {
   REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
   REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
   REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
   REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
 };

 #define REG_ADDR(state,regnum) ((char *)(state)+reg_offset[regnum])

 /* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
  * Caller knows that the regs handled in one transaction are of same size.
  */
 #define FETCH_REGS(state, regnum, count) \
   memcpy (&registers[REGISTER_BYTE (regnum)], \
 	  REG_ADDR (state, regnum), \
 	  count * REGISTER_RAW_SIZE (regnum))

 /* Store COUNT contiguous registers to thread STATE starting from REGNUM */
 #define STORE_REGS(state, regnum, count) \
   memcpy (REG_ADDR (state, regnum), \
 	  &registers[REGISTER_BYTE (regnum)], \
 	  count * REGISTER_RAW_SIZE (regnum))

 /*
  * Fetch inferiors registers for gdb.
  * REG specifies which (as gdb views it) register, -1 for all.
  */
 void
 gnu_fetch_registers (int reg)
 {
   struct proc *thread;
   thread_state_t state;

   inf_update_procs (current_inferior);	/* Make sure we know about new threads.  */

   thread = inf_tid_to_thread (current_inferior, inferior_pid);
   if (!thread)
     error ("fetch inferior registers: %d: Invalid thread", inferior_pid);

   state = proc_get_state (thread, 0);

   if (!state)
     warning ("Couldn't fetch register %s from %s (invalid thread).",
 	     REGISTER_NAME (reg), proc_string (thread));
   else if (reg >= 0)
     {
       proc_debug (thread, "fetching register: %s", REGISTER_NAME (reg));
       supply_register (reg, REG_ADDR (state, reg));
       thread->fetched_regs |= (1 << reg);
     }
   else
     {
       proc_debug (thread, "fetching all registers");
       for (reg = 0; reg < NUM_REGS; reg++)
 	supply_register (reg, REG_ADDR (state, reg));
       thread->fetched_regs = ~0;
     }
 }

 /* Store our register values back into the inferior.
  * If REG is -1, do this for all registers.
  * Otherwise, REG specifies which register
  *
  * On mach3 all registers are always saved in one call.
  */
 void
 gnu_store_registers (reg)
      int reg;
 {
   struct proc *thread;
   int was_aborted, was_valid;
   thread_state_t state;
   thread_state_data_t old_state;

   inf_update_procs (current_inferior);	/* Make sure we know about new threads.  */

   thread = inf_tid_to_thread (current_inferior, inferior_pid);
   if (!thread)
     error ("store inferior registers: %d: Invalid thread", inferior_pid);

   proc_debug (thread, "storing register %s.", REGISTER_NAME (reg));

   was_aborted = thread->aborted;
   was_valid = thread->state_valid;
   if (!was_aborted && was_valid)
     bcopy (&thread->state, &old_state, sizeof (old_state));

   state = proc_get_state (thread, 1);

   if (!state)
     warning ("Couldn't store register %s from %s (invalid thread).",
 	     REGISTER_NAME (reg), proc_string (thread));
   else
     {
       if (!was_aborted && was_valid)
 	/* See which registers have changed after aborting the thread.  */
 	{
 	  int check_reg;
 	  for (check_reg = 0; check_reg < NUM_REGS; check_reg++)
 	    if ((thread->fetched_regs & (1 << check_reg))
 		&& bcmp (REG_ADDR (&old_state, check_reg),
 			 REG_ADDR (state, check_reg),
 			 REGISTER_RAW_SIZE (check_reg)))
 	      /* Register CHECK_REG has changed!  Ack!  */
 	      {
 		warning ("Register %s changed after thread was aborted.",
 			 REGISTER_NAME (check_reg));
 		if (reg >= 0 && reg != check_reg)
 		  /* Update gdb's copy of the register.  */
 		  supply_register (check_reg, REG_ADDR (state, check_reg));
 		else
 		  warning ("... also writing this register!  Suspicious...");
 	      }
 	}

       if (reg >= 0)
 	{
 	  proc_debug (thread, "storing register: %s", REGISTER_NAME (reg));
 	  STORE_REGS (state, reg, 1);
 	}
       else
 	{
 	  proc_debug (thread, "storing all registers");
 	  for (reg = 0; reg < NUM_REGS; reg++)
 	    STORE_REGS (state, reg, 1);
 	}
     }
 }

 /* jtv@hut.fi: I copied and modified this 387 code from
  * gdb/i386-xdep.c. Modifications for Mach 3.0.
  *
  * i387 status dumper. See also i387-tdep.c
  */
 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];
 };
 /* This routine is machine independent?
  * Should move it to i387-tdep.c but you need to export struct env387
  */
 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 >> (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]);

       floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
 			     &val);
       printf_unfiltered ("  %g\n", val);
     }
   if (ep->r0)
     printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string (ep->r0));
   if (ep->r1)
     printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string (ep->r1));
   if (ep->r2)
     printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string (ep->r2));
   if (ep->r3)
     printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string (ep->r3));
 }

 /*
  * values that go into fp_kind (from <i386/fpreg.h>)
  */
 #define FP_NO   0		/* no fp chip, no emulator (no fp support)      */
 #define FP_SW   1		/* no fp chip, using software emulator          */
 #define FP_HW   2		/* chip present bit                             */
 #define FP_287  2		/* 80287 chip present                           */
 #define FP_387  3		/* 80387 chip present                           */

 typedef struct fpstate
 {
 #if 1
   unsigned char state[FP_STATE_BYTES];	/* "hardware" state */
 #else
   struct env387 state;		/* Actually this */
 #endif
   int status;			/* Duplicate status */
 }
  *fpstate_t;

 /* Mach 3 specific routines.
  */
 static int
 get_i387_state (fstate)
      struct fpstate *fstate;
 {
   error_t err;
   thread_state_data_t state;
   unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
   struct i386_float_state *fsp;
   struct proc *thread = inf_tid_to_thread (current_inferior, inferior_pid);

   if (!thread)
     error ("get_i387_state: Invalid thread");

   proc_abort (thread, 0);	/* Make sure THREAD's in a reasonable state. */

   err = thread_get_state (thread->port, i386_FLOAT_STATE, state, &fsCnt);
   if (err)
     {
       warning ("Can not get live floating point state: %s",
 	       mach_error_string (err));
       return 0;
     }

   fsp = (struct i386_float_state *) state;
   /* The 387 chip (also 486 counts) or a software emulator? */
   if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
     return 0;

   /* Clear the target then copy thread's float state there.
      Make a copy of the status word, for some reason?
    */
   memset (fstate, 0, sizeof (struct fpstate));

   fstate->status = fsp->exc_status;

   memcpy (fstate->state, (char *) &fsp->hw_state, FP_STATE_BYTES);

   return 1;
 }

 /*
  * This is called by "info float" command
  */
 void
 i386_mach3_float_info ()
 {
   char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
   int valid = 0;
   fpstate_t fps;

   if (target_has_execution)
     valid = get_i387_state (buf);

   if (!valid)
     {
       warning ("no floating point status saved");
       return;
     }

   fps = (fpstate_t) buf;

   print_387_status (fps->status, (struct env387 *) fps->state);
 }
	/* Low level interface to I386 running the GNU Hurd
	Copyright (C) 1992, 1995, 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 "defs.h"
	#include "inferior.h"
	#include "floatformat.h"

	#include <stdio.h>
	#include <errno.h>

	#include <mach.h>
	#include <mach/message.h>
	#include <mach/exception.h>
	#include <mach_error.h>

	#include "gnu-nat.h"

	/* Hmmm... Should this not be here?
	* Now for i386_float_info() target_has_execution
	*/
	#include <target.h>

	/* @@@ Should move print_387_status() to i387-tdep.c */
	extern void print_387_control_word (); /* i387-tdep.h */
	extern void print_387_status_word ();

	/* Find offsets to thread states at compile time.
	* If your compiler does not grok this, calculate offsets
	* offsets yourself and use them (or get a compatible compiler :-)
	*/

	#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)

	/* at reg_offset[i] is the offset to the i386_thread_state
	* location where the gdb registers[i] is stored.
	*/

	static int reg_offset[] =
	{
	REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
	REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
	REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
	REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
	};

	#define REG_ADDR(state,regnum) ((char *)(state)+reg_offset[regnum])

	/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
	* Caller knows that the regs handled in one transaction are of same size.
	*/
	#define FETCH_REGS(state, regnum, count) \
	memcpy (&registers[REGISTER_BYTE (regnum)], \
	REG_ADDR (state, regnum), \
	count * REGISTER_RAW_SIZE (regnum))

	/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
	#define STORE_REGS(state, regnum, count) \
	memcpy (REG_ADDR (state, regnum), \
	&registers[REGISTER_BYTE (regnum)], \
	count * REGISTER_RAW_SIZE (regnum))

	/*
	* Fetch inferiors registers for gdb.
	* REG specifies which (as gdb views it) register, -1 for all.
	*/
	void
	gnu_fetch_registers (int reg)
	{
	struct proc *thread;
	thread_state_t state;

	inf_update_procs (current_inferior); /* Make sure we know about new threads. */

	thread = inf_tid_to_thread (current_inferior, inferior_pid);
	if (!thread)
	error ("fetch inferior registers: %d: Invalid thread", inferior_pid);

	state = proc_get_state (thread, 0);

	if (!state)
	warning ("Couldn't fetch register %s from %s (invalid thread).",
	REGISTER_NAME (reg), proc_string (thread));
	else if (reg >= 0)
	{
	proc_debug (thread, "fetching register: %s", REGISTER_NAME (reg));
	supply_register (reg, REG_ADDR (state, reg));
	thread->fetched_regs \|= (1 << reg);
	}
	else
	{
	proc_debug (thread, "fetching all registers");
	for (reg = 0; reg < NUM_REGS; reg++)
	supply_register (reg, REG_ADDR (state, reg));
	thread->fetched_regs = ~0;
	}
	}

	/* Store our register values back into the inferior.
	* If REG is -1, do this for all registers.
	* Otherwise, REG specifies which register
	*
	* On mach3 all registers are always saved in one call.
	*/
	void
	gnu_store_registers (reg)
	int reg;
	{
	struct proc *thread;
	int was_aborted, was_valid;
	thread_state_t state;
	thread_state_data_t old_state;

	inf_update_procs (current_inferior); /* Make sure we know about new threads. */

	thread = inf_tid_to_thread (current_inferior, inferior_pid);
	if (!thread)
	error ("store inferior registers: %d: Invalid thread", inferior_pid);

	proc_debug (thread, "storing register %s.", REGISTER_NAME (reg));

	was_aborted = thread->aborted;
	was_valid = thread->state_valid;
	if (!was_aborted && was_valid)
	bcopy (&thread->state, &old_state, sizeof (old_state));

	state = proc_get_state (thread, 1);

	if (!state)
	warning ("Couldn't store register %s from %s (invalid thread).",
	REGISTER_NAME (reg), proc_string (thread));
	else
	{
	if (!was_aborted && was_valid)
	/* See which registers have changed after aborting the thread. */
	{
	int check_reg;
	for (check_reg = 0; check_reg < NUM_REGS; check_reg++)
	if ((thread->fetched_regs & (1 << check_reg))
	&& bcmp (REG_ADDR (&old_state, check_reg),
	REG_ADDR (state, check_reg),
	REGISTER_RAW_SIZE (check_reg)))
	/* Register CHECK_REG has changed! Ack! */
	{
	warning ("Register %s changed after thread was aborted.",
	REGISTER_NAME (check_reg));
	if (reg >= 0 && reg != check_reg)
	/* Update gdb's copy of the register. */
	supply_register (check_reg, REG_ADDR (state, check_reg));
	else
	warning ("... also writing this register! Suspicious...");
	}
	}

	if (reg >= 0)
	{
	proc_debug (thread, "storing register: %s", REGISTER_NAME (reg));
	STORE_REGS (state, reg, 1);
	}
	else
	{
	proc_debug (thread, "storing all registers");
	for (reg = 0; reg < NUM_REGS; reg++)
	STORE_REGS (state, reg, 1);
	}
	}
	}

	/* jtv@hut.fi: I copied and modified this 387 code from
	* gdb/i386-xdep.c. Modifications for Mach 3.0.
	*
	* i387 status dumper. See also i387-tdep.c
	*/
	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];
	};
	/* This routine is machine independent?
	* Should move it to i387-tdep.c but you need to export struct env387
	*/
	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 >> (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]);

	floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
	&val);
	printf_unfiltered (" %g\n", val);
	}
	if (ep->r0)
	printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string (ep->r0));
	if (ep->r1)
	printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string (ep->r1));
	if (ep->r2)
	printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string (ep->r2));
	if (ep->r3)
	printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string (ep->r3));
	}

	/*
	* values that go into fp_kind (from <i386/fpreg.h>)
	*/
	#define FP_NO 0 /* no fp chip, no emulator (no fp support) */
	#define FP_SW 1 /* no fp chip, using software emulator */
	#define FP_HW 2 /* chip present bit */
	#define FP_287 2 /* 80287 chip present */
	#define FP_387 3 /* 80387 chip present */

	typedef struct fpstate
	{
	#if 1
	unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
	#else
	struct env387 state; /* Actually this */
	#endif
	int status; /* Duplicate status */
	}
	*fpstate_t;

	/* Mach 3 specific routines.
	*/
	static int
	get_i387_state (fstate)
	struct fpstate *fstate;
	{
	error_t err;
	thread_state_data_t state;
	unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
	struct i386_float_state *fsp;
	struct proc *thread = inf_tid_to_thread (current_inferior, inferior_pid);

	if (!thread)
	error ("get_i387_state: Invalid thread");

	proc_abort (thread, 0); /* Make sure THREAD's in a reasonable state. */

	err = thread_get_state (thread->port, i386_FLOAT_STATE, state, &fsCnt);
	if (err)
	{
	warning ("Can not get live floating point state: %s",
	mach_error_string (err));
	return 0;
	}

	fsp = (struct i386_float_state *) state;
	/* The 387 chip (also 486 counts) or a software emulator? */
	if (!fsp->initialized \|\| (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
	return 0;

	/* Clear the target then copy thread's float state there.
	Make a copy of the status word, for some reason?
	*/
	memset (fstate, 0, sizeof (struct fpstate));

	fstate->status = fsp->exc_status;

	memcpy (fstate->state, (char *) &fsp->hw_state, FP_STATE_BYTES);

	return 1;
	}

	/*
	* This is called by "info float" command
	*/
	void
	i386_mach3_float_info ()
	{
	char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
	int valid = 0;
	fpstate_t fps;

	if (target_has_execution)
	valid = get_i387_state (buf);

	if (!valid)
	{
	warning ("no floating point status saved");
	return;
	}

	fps = (fpstate_t) buf;

	print_387_status (fps->status, (struct env387 *) fps->state);
	}