252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
/* Intel 386 stuff.
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Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "param.h"
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#include "frame.h"
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#include "inferior.h"
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#include "language.h"
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#include "gdbcore.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/reg.h>
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#include "ieee-float.h"
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#include "target.h"
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extern void print_387_control_word (); /* i387-tdep.h */
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extern void print_387_status_word ();
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extern struct ext_format ext_format_i387;
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/* this table must line up with REGISTER_NAMES in m-i386.h */
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/* symbols like 'EAX' come from <sys/reg.h> */
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static int regmap[] =
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{
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EAX, ECX, EDX, EBX,
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UESP, EBP, ESI, EDI,
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EIP, EFL, CS, SS,
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DS, ES, FS, GS,
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};
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/* blockend is the value of u.u_ar0, and points to the
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* place where GS is stored
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*/
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i386_register_u_addr (blockend, regnum)
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{
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#if 0
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/* this will be needed if fp registers are reinstated */
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/* for now, you can look at them with 'info float'
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* sys5 wont let you change them with ptrace anyway
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*/
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if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
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{
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int ubase, fpstate;
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struct user u;
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ubase = blockend + 4 * (SS + 1) - KSTKSZ;
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fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
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return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
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}
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else
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#endif
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return (blockend + 4 * regmap[regnum]);
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}
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#if 0
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/* mauro@olympus 1991.10.20 -- compiling the following code causes
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undefined symbols at link time, specifically: corechan, have_inferior_p */
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struct env387
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{
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unsigned short control;
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unsigned short r0;
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unsigned short status;
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unsigned short r1;
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unsigned short tag;
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unsigned short r2;
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unsigned long eip;
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unsigned short code_seg;
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unsigned short opcode;
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unsigned long operand;
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unsigned short operand_seg;
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unsigned short r3;
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unsigned char regs[8][10];
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};
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static
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print_387_status (status, ep)
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unsigned short status;
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struct env387 *ep;
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{
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int i;
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int bothstatus;
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int top;
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int fpreg;
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unsigned char *p;
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bothstatus = ((status != 0) && (ep->status != 0));
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if (status != 0)
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{
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if (bothstatus)
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printf ("u: ");
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print_387_status_word (status);
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}
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if (ep->status != 0)
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{
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if (bothstatus)
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printf ("e: ");
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print_387_status_word (ep->status);
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}
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print_387_control_word (ep->control);
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printf ("last exception: ");
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printf ("opcode %s; ", local_hex_string(ep->opcode));
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printf ("pc %s:", local_hex_string(ep->code_seg));
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printf ("%s; ", local_hex_string(ep->eip));
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printf ("operand %s", local_hex_string(ep->operand_seg));
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printf (":%s\n", local_hex_string(ep->operand));
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top = (ep->status >> 11) & 7;
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printf ("regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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double val;
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printf ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
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switch ((ep->tag >> (fpreg * 2)) & 3)
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{
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case 0: printf ("valid "); break;
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case 1: printf ("zero "); break;
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case 2: printf ("trap "); break;
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case 3: printf ("empty "); break;
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}
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for (i = 9; i >= 0; i--)
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printf ("%02x", ep->regs[fpreg][i]);
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ieee_extended_to_double (&ext_format_i387, (char *)ep->regs[fpreg],
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&val);
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printf (" %g\n", val);
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}
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if (ep->r0)
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printf ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
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if (ep->r1)
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printf ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
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if (ep->r2)
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printf ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
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if (ep->r3)
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printf ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
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}
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#ifndef U_FPSTATE
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#define U_FPSTATE(u) u.u_fpstate
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#endif
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i386_float_info ()
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{
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struct user u; /* just for address computations */
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int i;
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/* fpstate defined in <sys/user.h> */
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struct fpstate *fpstatep;
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char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
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unsigned int uaddr;
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char fpvalid = 0;
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unsigned int rounded_addr;
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unsigned int rounded_size;
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extern int corechan;
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int skip;
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uaddr = (char *)&u.u_fpvalid - (char *)&u;
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if (target_has_execution)
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{
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unsigned int data;
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unsigned int mask;
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rounded_addr = uaddr & -sizeof (int);
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data = ptrace (3, inferior_pid, rounded_addr, 0);
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mask = 0xff << ((uaddr - rounded_addr) * 8);
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fpvalid = ((data & mask) != 0);
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}
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#if 0
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else
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{
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if (lseek (corechan, uaddr, 0) < 0)
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perror ("seek on core file");
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if (myread (corechan, &fpvalid, 1) < 0)
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perror ("read on core file");
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}
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#endif /* no core support yet */
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if (fpvalid == 0)
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{
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printf ("no floating point status saved\n");
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return;
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}
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uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
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if (target_has_execution)
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{
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int *ip;
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rounded_addr = uaddr & -sizeof (int);
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rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
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sizeof (int) - 1) / sizeof (int);
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skip = uaddr - rounded_addr;
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ip = (int *)buf;
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for (i = 0; i < rounded_size; i++)
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{
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*ip++ = ptrace (3, inferior_pid, rounded_addr, 0);
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rounded_addr += sizeof (int);
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}
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}
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#if 0
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else
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{
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if (lseek (corechan, uaddr, 0) < 0)
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perror_with_name ("seek on core file");
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if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
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perror_with_name ("read from core file");
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skip = 0;
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}
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#endif /* 0 */
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fpstatep = (struct fpstate *)(buf + skip);
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print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
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}
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#endif /* mauro@olympus 1991.10.20 */
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