gdb/i386b-nat.c - binutils-gdb - Git at Google

 /* Native-dependent code for BSD Unix running on i386's, for GDB.
    Copyright 1988, 1989, 1991, 1992, 1994, 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"

 #ifdef FETCH_INFERIOR_REGISTERS
 #include <sys/types.h>
 #include <sys/ptrace.h>
 #include <machine/reg.h>
 #include <machine/frame.h>
 #include "inferior.h"

 void
 fetch_inferior_registers (regno)
      int regno;
 {
   struct reg inferior_registers;

   ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
   registers_fetched ();
 }

 void
 store_inferior_registers (regno)
      int regno;
 {
   struct reg inferior_registers;

   memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4 * NUM_REGS);
   ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
 }

 struct md_core
 {
   struct reg intreg;
   struct fpreg freg;
 };

 void
 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
      char *core_reg_sect;
      unsigned core_reg_size;
      int which;
      CORE_ADDR ignore;
 {
   struct md_core *core_reg = (struct md_core *) core_reg_sect;

   /* integer registers */
   memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
 	  sizeof (struct reg));
   /* floating point registers */
   /* XXX */
 }

 #else

 #include <machine/reg.h>

 /* this table must line up with REGISTER_NAMES in tm-i386.h */
 /* symbols like 'tEAX' come from <machine/reg.h> */
 static int tregmap[] =
 {
   tEAX, tECX, tEDX, tEBX,
   tESP, tEBP, tESI, tEDI,
   tEIP, tEFLAGS, tCS, tSS
 };

 #ifdef sEAX
 static int sregmap[] =
 {
   sEAX, sECX, sEDX, sEBX,
   sESP, sEBP, sESI, sEDI,
   sEIP, sEFLAGS, sCS, sSS
 };
 #else /* No sEAX */

 /* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
    ones aren't around, use the t* ones for sregmap too.  */

 static int sregmap[] =
 {
   tEAX, tECX, tEDX, tEBX,
   tESP, tEBP, tESI, tEDI,
   tEIP, tEFLAGS, tCS, tSS
 };
 #endif /* No sEAX */

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

 int
 i386_register_u_addr (blockend, regnum)
      int blockend;
      int regnum;
 {
   /* The following condition is a kludge to get at the proper register map
      depending upon the state of pcb_flag.
      The proper condition would be
      if (u.u_pcb.pcb_flag & FM_TRAP)
      but that would require a ptrace call here and wouldn't work
      for corefiles.  */

   if (blockend < 0x1fcc)
     return (blockend + 4 * tregmap[regnum]);
   else
     return (blockend + 4 * sregmap[regnum]);
 }

 #endif /* !FETCH_INFERIOR_REGISTERS */

 #ifdef FLOAT_INFO
 #include "expression.h"
 #include "language.h"		/* for local_hex_string */
 #include "floatformat.h"

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

 #include <a.out.h>

 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/uio.h>
 #define curpcb Xcurpcb		/* XXX avoid leaking declaration from pcb.h */
 #include <sys/user.h>
 #undef curpcb
 #include <sys/file.h>
 #include "gdb_stat.h"
 #include <sys/ptrace.h>

 extern void print_387_control_word ();	/* i387-tdep.h */
 extern void print_387_status_word ();

 #define	fpstate		save87
 #define	U_FPSTATE(u)	u.u_pcb.pcb_savefpu

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

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

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

   print_387_control_word ((unsigned int) 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);
     }
 }

 i386_float_info ()
 {
   struct user u;		/* just for address computations */
   int i;
   /* fpstate defined in <sys/user.h> */
   struct fpstate *fpstatep;
   char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
   unsigned int uaddr;
   char fpvalid;
   unsigned int rounded_addr;
   unsigned int rounded_size;
   /*extern int corechan; */
   int skip;
   extern int inferior_pid;

   uaddr = (char *) &U_FPSTATE (u) - (char *) &u;
   if (inferior_pid)
     {
       int *ip;

       rounded_addr = uaddr & -sizeof (int);
       rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
 		      sizeof (int) - 1) / sizeof (int);
       skip = uaddr - rounded_addr;

       ip = (int *) buf;
       for (i = 0; i < rounded_size; i++)
 	{
 	  *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t) rounded_addr, 0);
 	  rounded_addr += sizeof (int);
 	}
     }
   else
     {
       printf ("float info: can't do a core file (yet)\n");
       return;
 #if 0
       if (lseek (corechan, uaddr, 0) < 0)
 	perror_with_name ("seek on core file");
       if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
 	  perror_with_name ("read from core file");
       skip = 0;
 #endif
     }

   print_387_status (0, (struct env387 *) buf);
 }

 int
 kernel_u_size ()
 {
   return (sizeof (struct user));
 }

 #endif
	/* Native-dependent code for BSD Unix running on i386's, for GDB.
	Copyright 1988, 1989, 1991, 1992, 1994, 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"

	#ifdef FETCH_INFERIOR_REGISTERS
	#include <sys/types.h>
	#include <sys/ptrace.h>
	#include <machine/reg.h>
	#include <machine/frame.h>
	#include "inferior.h"

	void
	fetch_inferior_registers (regno)
	int regno;
	{
	struct reg inferior_registers;

	ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
	memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
	registers_fetched ();
	}

	void
	store_inferior_registers (regno)
	int regno;
	{
	struct reg inferior_registers;

	memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4 * NUM_REGS);
	ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
	}

	struct md_core
	{
	struct reg intreg;
	struct fpreg freg;
	};

	void
	fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
	char *core_reg_sect;
	unsigned core_reg_size;
	int which;
	CORE_ADDR ignore;
	{
	struct md_core core_reg = (struct md_core ) core_reg_sect;

	/* integer registers */
	memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
	sizeof (struct reg));
	/* floating point registers */
	/* XXX */
	}

	#else

	#include <machine/reg.h>

	/* this table must line up with REGISTER_NAMES in tm-i386.h */
	/* symbols like 'tEAX' come from <machine/reg.h> */
	static int tregmap[] =
	{
	tEAX, tECX, tEDX, tEBX,
	tESP, tEBP, tESI, tEDI,
	tEIP, tEFLAGS, tCS, tSS
	};

	#ifdef sEAX
	static int sregmap[] =
	{
	sEAX, sECX, sEDX, sEBX,
	sESP, sEBP, sESI, sEDI,
	sEIP, sEFLAGS, sCS, sSS
	};
	#else /* No sEAX */

	/* FreeBSD has decided to collapse the s* and t* symbols. So if the s*
	ones aren't around, use the t* ones for sregmap too. */

	static int sregmap[] =
	{
	tEAX, tECX, tEDX, tEBX,
	tESP, tEBP, tESI, tEDI,
	tEIP, tEFLAGS, tCS, tSS
	};
	#endif /* No sEAX */

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

	int
	i386_register_u_addr (blockend, regnum)
	int blockend;
	int regnum;
	{
	/* The following condition is a kludge to get at the proper register map
	depending upon the state of pcb_flag.
	The proper condition would be
	if (u.u_pcb.pcb_flag & FM_TRAP)
	but that would require a ptrace call here and wouldn't work
	for corefiles. */

	if (blockend < 0x1fcc)
	return (blockend + 4 * tregmap[regnum]);
	else
	return (blockend + 4 * sregmap[regnum]);
	}

	#endif /* !FETCH_INFERIOR_REGISTERS */

	#ifdef FLOAT_INFO
	#include "expression.h"
	#include "language.h" /* for local_hex_string */
	#include "floatformat.h"

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

	#include <a.out.h>

	#include <sys/time.h>
	#include <sys/resource.h>
	#include <sys/uio.h>
	#define curpcb Xcurpcb /* XXX avoid leaking declaration from pcb.h */
	#include <sys/user.h>
	#undef curpcb
	#include <sys/file.h>
	#include "gdb_stat.h"
	#include <sys/ptrace.h>

	extern void print_387_control_word (); /* i387-tdep.h */
	extern void print_387_status_word ();

	#define fpstate save87
	#define U_FPSTATE(u) u.u_pcb.pcb_savefpu

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

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

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

	print_387_control_word ((unsigned int) 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);
	}
	}

	i386_float_info ()
	{
	struct user u; /* just for address computations */
	int i;
	/* fpstate defined in <sys/user.h> */
	struct fpstate *fpstatep;
	char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
	unsigned int uaddr;
	char fpvalid;
	unsigned int rounded_addr;
	unsigned int rounded_size;
	/extern int corechan; /
	int skip;
	extern int inferior_pid;

	uaddr = (char ) &U_FPSTATE (u) - (char ) &u;
	if (inferior_pid)
	{
	int *ip;

	rounded_addr = uaddr & -sizeof (int);
	rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
	sizeof (int) - 1) / sizeof (int);
	skip = uaddr - rounded_addr;

	ip = (int *) buf;
	for (i = 0; i < rounded_size; i++)
	{
	*ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t) rounded_addr, 0);
	rounded_addr += sizeof (int);
	}
	}
	else
	{
	printf ("float info: can't do a core file (yet)\n");
	return;
	#if 0
	if (lseek (corechan, uaddr, 0) < 0)
	perror_with_name ("seek on core file");
	if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
	perror_with_name ("read from core file");
	skip = 0;
	#endif
	}

	print_387_status (0, (struct env387 *) buf);
	}

	int
	kernel_u_size ()
	{
	return (sizeof (struct user));
	}

	#endif