1 /* Intel 386 native support for SYSV systems (pre-SVR4).
2 Copyright (C) 1988, 1989, 1991, 1992 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. */
27 #include <sys/types.h>
30 #include <sys/param.h>
34 #include <sys/ioctl.h>
44 #include "ieee-float.h"
48 extern struct ext_format ext_format_i387
;
50 /* this table must line up with REGISTER_NAMES in tm-i386v.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
65 i386_register_u_addr (blockend
, regnum
)
70 /* this will be needed if fp registers are reinstated */
71 /* for now, you can look at them with 'info float'
72 * sys5 wont let you change them with ptrace anyway
74 if (regnum
>= FP0_REGNUM
&& regnum
<= FP7_REGNUM
)
78 ubase
= blockend
+ 4 * (SS
+ 1) - KSTKSZ
;
79 fpstate
= ubase
+ ((char *)&u
.u_fpstate
- (char *)&u
);
80 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
84 return (blockend
+ 4 * regmap
[regnum
]);
89 /* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called
90 via a command xxx and eventually calls ptrace without ever having
91 traversed the target vector. This would be terribly impolite
92 behaviour for a sun4 hosted remote gdb.
94 A fix might be to move this code into the "info registers" command.
95 rich@cygnus.com 15 Sept 92. */
98 struct user u
; /* just for address computations */
100 /* fpstate defined in <sys/user.h> */
101 struct fpstate
*fpstatep
;
102 char buf
[sizeof (struct fpstate
) + 2 * sizeof (int)];
105 unsigned int rounded_addr
;
106 unsigned int rounded_size
;
110 uaddr
= (char *)&u
.u_fpvalid
- (char *)&u
;
111 if (target_has_execution
)
116 rounded_addr
= uaddr
& -sizeof (int);
117 data
= ptrace (3, inferior_pid
, (PTRACE_ARG3_TYPE
) rounded_addr
, 0);
118 mask
= 0xff << ((uaddr
- rounded_addr
) * 8);
120 fpvalid
= ((data
& mask
) != 0);
125 if (lseek (corechan
, uaddr
, 0) < 0)
126 perror ("seek on core file");
127 if (myread (corechan
, &fpvalid
, 1) < 0)
128 perror ("read on core file");
131 #endif /* no core support yet */
135 printf ("no floating point status saved\n");
139 uaddr
= (char *)&U_FPSTATE(u
) - (char *)&u
;
140 if (target_has_execution
)
144 rounded_addr
= uaddr
& -sizeof (int);
145 rounded_size
= (((uaddr
+ sizeof (struct fpstate
)) - uaddr
) +
146 sizeof (int) - 1) / sizeof (int);
147 skip
= uaddr
- rounded_addr
;
150 for (i
= 0; i
< rounded_size
; i
++)
152 *ip
++ = ptrace (3, inferior_pid
, (PTRACE_ARG3_TYPE
) rounded_addr
, 0);
153 rounded_addr
+= sizeof (int);
159 if (lseek (corechan
, uaddr
, 0) < 0)
160 perror_with_name ("seek on core file");
161 if (myread (corechan
, buf
, sizeof (struct fpstate
)) < 0)
162 perror_with_name ("read from core file");
167 fpstatep
= (struct fpstate
*)(buf
+ skip
);
168 print_387_status (fpstatep
->status
, (struct env387
*)fpstatep
->state
);