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* i386-xdep.c, symm-xdep.c: Remove most 387 support. 

* i386-xdep.c:  Output hex with local_hex_string for Modula-2 support.
This commit is contained in:
John Gilmore 1991-09-18 23:15:20 +00:00
parent cab7a41746
commit 5142120ece
2 changed files with 26 additions and 251 deletions
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154
gdb/i386-xdep.c
View File

@ -1,5 +1,5 @@
/* 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.
@ -22,6 +22,7 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "param.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "gdbcore.h"
#ifdef USG
@ -39,6 +40,12 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <sys/stat.h>
#include <sys/reg.h>
#include "ieee-float.h"
extern void print_387_control_word (); /* i387-tdep.h */
extern void print_387_status_word ();
extern struct ext_format ext_format_i387;
/* this table must line up with REGISTER_NAMES in m-i386.h */
/* symbols like 'EAX' come from <sys/reg.h> */
@ -74,68 +81,6 @@ i386_register_u_addr (blockend, regnum)
}
/* 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");
}
struct env387
{
unsigned short control;
@ -153,69 +98,6 @@ struct env387
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;
@ -244,9 +126,11 @@ print_387_status (status, ep)
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;
@ -267,17 +151,18 @@ print_387_status (status, ep)
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
@ -354,4 +239,3 @@ i386_float_info ()
fpstatep = (struct fpstate *)(buf + skip);
print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
}

123
gdb/symm-xdep.c
View File

@ -17,7 +17,8 @@ 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. */
/* many 387-specific items of use taken from i386-dep.c */
/* FIXME, some 387-specific items of use taken from i387-tdep.c -- ought to be
merged back in. */
#include <stdio.h>
#include "defs.h"
@ -34,13 +35,13 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <sys/stat.h>
#include "gdbcore.h"
#include <fcntl.h>
static long i386_get_frame_setup ();
static i386_follow_jump ();
#include <sgtty.h>
#define TERMINAL struct sgttyb
extern void print_387_control_word ();
extern void print_387_status_word ();
extern void i387_to_double (from, to);
store_inferior_registers(regno)
int regno;
{
@ -244,73 +245,10 @@ printf("u.u_tsize= %#x, u.u_dsize= %#x, u.u_ssize= %#x, stack_off= %#x\n",
printf ("No core file now.\n");
}
/* from i386-dep.c */
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 %#04x: ", status);
if (status & 0xff) {
printf ("exceptions:"); /* exception names match <machine/fpu.h> */
if (status & 0x0001) printf (" FLTINV");
if (status & 0x0002) printf (" FLTDEN");
if (status & 0x0004) printf (" FLTDIV");
if (status & 0x0008) printf (" FLTOVF");
if (status & 0x0010) printf (" FLTUND");
if (status & 0x0020) printf (" FLTPRE");
if (status & 0x0040) printf (" FLTSTK");
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);
}
/* FIXME: This should be merged with i387-tdep.c as well. */
static
print_fpu_status(ep)
struct pt_regset ep;
{
int i;
int bothstatus;
@ -487,7 +425,6 @@ struct pt_regset ep;
}
i386_float_info ()
{
char ubuf[UPAGES*NBPG];
struct pt_regset regset;
@ -509,49 +446,3 @@ i386_float_info ()
print_fpu_status(regset);
print_fpa_status(regset);
}
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");
}