2 Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
29 #include <sys/types.h>
32 #include <sys/param.h>
36 #include <sys/ioctl.h>
43 #include "ieee-float.h"
45 extern void print_387_control_word (); /* i387-tdep.h */
46 extern void print_387_status_word ();
48 extern struct ext_format ext_format_i387
;
50 /* this table must line up with REGISTER_NAMES in m-i386.h */
51 /* symbols like 'EAX' come from <sys/reg.h> */
60 /* blockend is the value of u.u_ar0, and points to the
61 * place where GS is stored
63 i386_register_u_addr (blockend
, regnum
)
66 /* this will be needed if fp registers are reinstated */
67 /* for now, you can look at them with 'info float'
68 * sys5 wont let you change them with ptrace anyway
70 if (regnum
>= FP0_REGNUM
&& regnum
<= FP7_REGNUM
)
74 ubase
= blockend
+ 4 * (SS
+ 1) - KSTKSZ
;
75 fpstate
= ubase
+ ((char *)&u
.u_fpstate
- (char *)&u
);
76 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
80 return (blockend
+ 4 * regmap
[regnum
]);
85 /* mauro@olympus 1991.10.20 -- compiling the following code causes
86 undefined symbols at link time, specifically: corechan, have_inferior_p */
89 unsigned short control
;
91 unsigned short status
;
96 unsigned short code_seg
;
97 unsigned short opcode
;
98 unsigned long operand
;
99 unsigned short operand_seg
;
101 unsigned char regs
[8][10];
105 print_387_status (status
, ep
)
106 unsigned short status
;
115 bothstatus
= ((status
!= 0) && (ep
->status
!= 0));
120 print_387_status_word (status
);
127 print_387_status_word (ep
->status
);
130 print_387_control_word (ep
->control
);
131 printf ("last exception: ");
132 printf ("opcode %s; ", local_hex_string(ep
->opcode
));
133 printf ("pc %s:", local_hex_string(ep
->code_seg
));
134 printf ("%s; ", local_hex_string(ep
->eip
));
135 printf ("operand %s", local_hex_string(ep
->operand_seg
));
136 printf (":%s\n", local_hex_string(ep
->operand
));
138 top
= (ep
->status
>> 11) & 7;
140 printf ("regno tag msb lsb value\n");
141 for (fpreg
= 7; fpreg
>= 0; fpreg
--)
145 printf ("%s %d: ", fpreg
== top
? "=>" : " ", fpreg
);
147 switch ((ep
->tag
>> (fpreg
* 2)) & 3)
149 case 0: printf ("valid "); break;
150 case 1: printf ("zero "); break;
151 case 2: printf ("trap "); break;
152 case 3: printf ("empty "); break;
154 for (i
= 9; i
>= 0; i
--)
155 printf ("%02x", ep
->regs
[fpreg
][i
]);
157 ieee_extended_to_double (&ext_format_i387
, (char *)ep
->regs
[fpreg
],
159 printf (" %g\n", val
);
162 printf ("warning: reserved0 is %s\n", local_hex_string(ep
->r0
));
164 printf ("warning: reserved1 is %s\n", local_hex_string(ep
->r1
));
166 printf ("warning: reserved2 is %s\n", local_hex_string(ep
->r2
));
168 printf ("warning: reserved3 is %s\n", local_hex_string(ep
->r3
));
172 #define U_FPSTATE(u) u.u_fpstate
177 struct user u
; /* just for address computations */
179 /* fpstate defined in <sys/user.h> */
180 struct fpstate
*fpstatep
;
181 char buf
[sizeof (struct fpstate
) + 2 * sizeof (int)];
184 unsigned int rounded_addr
;
185 unsigned int rounded_size
;
189 uaddr
= (char *)&u
.u_fpvalid
- (char *)&u
;
190 if (have_inferior_p())
195 rounded_addr
= uaddr
& -sizeof (int);
196 data
= ptrace (3, inferior_pid
, rounded_addr
, 0);
197 mask
= 0xff << ((uaddr
- rounded_addr
) * 8);
199 fpvalid
= ((data
& mask
) != 0);
203 if (lseek (corechan
, uaddr
, 0) < 0)
204 perror ("seek on core file");
205 if (myread (corechan
, &fpvalid
, 1) < 0)
206 perror ("read on core file");
212 printf ("no floating point status saved\n");
216 uaddr
= (char *)&U_FPSTATE(u
) - (char *)&u
;
217 if (have_inferior_p ())
221 rounded_addr
= uaddr
& -sizeof (int);
222 rounded_size
= (((uaddr
+ sizeof (struct fpstate
)) - uaddr
) +
223 sizeof (int) - 1) / sizeof (int);
224 skip
= uaddr
- rounded_addr
;
227 for (i
= 0; i
< rounded_size
; i
++)
229 *ip
++ = ptrace (3, inferior_pid
, rounded_addr
, 0);
230 rounded_addr
+= sizeof (int);
235 if (lseek (corechan
, uaddr
, 0) < 0)
236 perror_with_name ("seek on core file");
237 if (myread (corechan
, buf
, sizeof (struct fpstate
)) < 0)
238 perror_with_name ("read from core file");
242 fpstatep
= (struct fpstate
*)(buf
+ skip
);
243 print_387_status (fpstatep
->status
, (struct env387
*)fpstatep
->state
);
245 #endif /* mauro@olympus 1991.10.20 */