/* Intel 386 stuff.
- Copyright (C) 1988, 1989 Free Software Foundation, Inc.
+ Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+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 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+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 GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-#include <stdio.h>
#include "defs.h"
-#include "param.h"
#include "frame.h"
#include "inferior.h"
+#include "language.h"
#include "gdbcore.h"
#ifdef USG
#include <sys/stat.h>
#include <sys/reg.h>
+#include "ieee-float.h"
+
+#include "target.h"
+
+extern struct ext_format ext_format_i387;
\f
/* this table must line up with REGISTER_NAMES in m-i386.h */
/* symbols like 'EAX' come from <sys/reg.h> */
/* blockend is the value of u.u_ar0, and points to the
* place where GS is stored
*/
+
+int
i386_register_u_addr (blockend, regnum)
+ int blockend;
+ int regnum;
{
#if 0
/* this will be needed if fp registers are reinstated */
}
-/* This is broken for cross debugging. Possible solutions are:
-
-1. Don't worry about whether the thing compiles for cross-debugging.
-Go ahead and call them from i386-tdep.c.
-1a. Same thing but use some macros in xm-i386.h so that gdb will
-compile for cross-debugging but just give an error (or some such behavior)
-when you attempt to convert floats.
-
-2. Write a portable (in the sense of running on any machine; it would
-always be for i387 floating-point formats) extended<->double converter
-(which just deals with the values as arrays of char).
-
-3. Assume the host machine has *some* IEEE chip. However, IEEE does
-not standardize formats for extended floats (387 is 10 bytes, 68881 is
-12 bytes), so this won't work. */
-
-i387_to_double (from, to)
- char *from;
- char *to;
-{
- long *lp;
- /* push extended mode on 387 stack, then pop in double mode
- *
- * first, set exception masks so no error is generated -
- * number will be rounded to inf or 0, if necessary
- */
- asm ("pushl %eax"); /* grab a stack slot */
- asm ("fstcw (%esp)"); /* get 387 control word */
- asm ("movl (%esp),%eax"); /* save old value */
- asm ("orl $0x3f,%eax"); /* mask all exceptions */
- asm ("pushl %eax");
- asm ("fldcw (%esp)"); /* load new value into 387 */
-
- asm ("movl 8(%ebp),%eax");
- asm ("fldt (%eax)"); /* push extended number on 387 stack */
- asm ("fwait");
- asm ("movl 12(%ebp),%eax");
- asm ("fstpl (%eax)"); /* pop double */
- asm ("fwait");
-
- asm ("popl %eax"); /* flush modified control word */
- asm ("fnclex"); /* clear exceptions */
- asm ("fldcw (%esp)"); /* restore original control word */
- asm ("popl %eax"); /* flush saved copy */
-}
-
-double_to_i387 (from, to)
- char *from;
- char *to;
-{
- /* push double mode on 387 stack, then pop in extended mode
- * no errors are possible because every 64-bit pattern
- * can be converted to an extended
- */
- asm ("movl 8(%ebp),%eax");
- asm ("fldl (%eax)");
- asm ("fwait");
- asm ("movl 12(%ebp),%eax");
- asm ("fstpt (%eax)");
- asm ("fwait");
-}
-
+#if 0
+/* mauro@olympus 1991.10.20 -- compiling the following code causes
+ undefined symbols at link time, specifically: corechan, have_inferior_p */
struct env387
{
unsigned short control;
unsigned char regs[8][10];
};
-static
-print_387_control_word (control)
-unsigned short control;
-{
- printf ("control 0x%04x: ", control);
- printf ("compute to ");
- switch ((control >> 8) & 3)
- {
- case 0: printf ("24 bits; "); break;
- case 1: printf ("(bad); "); break;
- case 2: printf ("53 bits; "); break;
- case 3: printf ("64 bits; "); break;
- }
- printf ("round ");
- switch ((control >> 10) & 3)
- {
- case 0: printf ("NEAREST; "); break;
- case 1: printf ("DOWN; "); break;
- case 2: printf ("UP; "); break;
- case 3: printf ("CHOP; "); break;
- }
- if (control & 0x3f)
- {
- printf ("mask:");
- if (control & 0x0001) printf (" INVALID");
- if (control & 0x0002) printf (" DENORM");
- if (control & 0x0004) printf (" DIVZ");
- if (control & 0x0008) printf (" OVERF");
- if (control & 0x0010) printf (" UNDERF");
- if (control & 0x0020) printf (" LOS");
- printf (";");
- }
- printf ("\n");
- if (control & 0xe080) printf ("warning: reserved bits on 0x%x\n",
- control & 0xe080);
-}
-
-static
-print_387_status_word (status)
- unsigned short status;
-{
- printf ("status 0x%04x: ", status);
- if (status & 0xff)
- {
- printf ("exceptions:");
- if (status & 0x0001) printf (" INVALID");
- if (status & 0x0002) printf (" DENORM");
- if (status & 0x0004) printf (" DIVZ");
- if (status & 0x0008) printf (" OVERF");
- if (status & 0x0010) printf (" UNDERF");
- if (status & 0x0020) printf (" LOS");
- if (status & 0x0040) printf (" FPSTACK");
- printf ("; ");
- }
- printf ("flags: %d%d%d%d; ",
- (status & 0x4000) != 0,
- (status & 0x0400) != 0,
- (status & 0x0200) != 0,
- (status & 0x0100) != 0);
-
- printf ("top %d\n", (status >> 11) & 7);
-}
-
static
print_387_status (status, ep)
unsigned short status;
print_387_control_word (ep->control);
printf ("last exception: ");
- printf ("opcode 0x%x; ", ep->opcode);
- printf ("pc 0x%x:0x%x; ", ep->code_seg, ep->eip);
- printf ("operand 0x%x:0x%x\n", ep->operand_seg, ep->operand);
+ printf ("opcode %s; ", local_hex_string(ep->opcode));
+ printf ("pc %s:", local_hex_string(ep->code_seg));
+ printf ("%s; ", local_hex_string(ep->eip));
+ printf ("operand %s", local_hex_string(ep->operand_seg));
+ printf (":%s\n", local_hex_string(ep->operand));
top = (ep->status >> 11) & 7;
for (i = 9; i >= 0; i--)
printf ("%02x", ep->regs[fpreg][i]);
- i387_to_double (ep->regs[fpreg], (char *)&val);
+ ieee_extended_to_double (&ext_format_i387, (char *)ep->regs[fpreg],
+ &val);
printf (" %g\n", val);
}
if (ep->r0)
- printf ("warning: reserved0 is 0x%x\n", ep->r0);
+ printf ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
if (ep->r1)
- printf ("warning: reserved1 is 0x%x\n", ep->r1);
+ printf ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
if (ep->r2)
- printf ("warning: reserved2 is 0x%x\n", ep->r2);
+ printf ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
if (ep->r3)
- printf ("warning: reserved3 is 0x%x\n", ep->r3);
+ printf ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
}
#ifndef U_FPSTATE
struct fpstate *fpstatep;
char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
unsigned int uaddr;
- char fpvalid;
+ char fpvalid = 0;
unsigned int rounded_addr;
unsigned int rounded_size;
extern int corechan;
int skip;
uaddr = (char *)&u.u_fpvalid - (char *)&u;
- if (have_inferior_p())
+ if (target_has_execution)
{
unsigned int data;
unsigned int mask;
fpvalid = ((data & mask) != 0);
}
+#if 0
else
{
if (lseek (corechan, uaddr, 0) < 0)
perror ("read on core file");
}
+#endif /* no core support yet */
if (fpvalid == 0)
{
}
uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
- if (have_inferior_p ())
+ if (target_has_execution)
{
int *ip;
rounded_addr += sizeof (int);
}
}
+#if 0
else
{
if (lseek (corechan, uaddr, 0) < 0)
perror_with_name ("read from core file");
skip = 0;
}
-
+ #endif /* 0 */
+
fpstatep = (struct fpstate *)(buf + skip);
print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
}
-
+#endif /* mauro@olympus 1991.10.20 */
projects / binutils.git / blobdiff