1 /* Intel 386 native support.
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>
41 #include "ieee-float.h"
45 extern struct ext_format ext_format_i387
;
47 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
48 /* symbols like 'EAX' come from <sys/reg.h> */
57 /* blockend is the value of u.u_ar0, and points to the
58 * place where GS is stored
62 i386_register_u_addr (blockend
, regnum
)
67 /* this will be needed if fp registers are reinstated */
68 /* for now, you can look at them with 'info float'
69 * sys5 wont let you change them with ptrace anyway
71 if (regnum
>= FP0_REGNUM
&& regnum
<= FP7_REGNUM
)
75 ubase
= blockend
+ 4 * (SS
+ 1) - KSTKSZ
;
76 fpstate
= ubase
+ ((char *)&u
.u_fpstate
- (char *)&u
);
77 return (fpstate
+ 0x1c + 10 * (regnum
- FP0_REGNUM
));
81 return (blockend
+ 4 * regmap
[regnum
]);
86 /* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called
87 via a command xxx and eventually calls ptrace without ever having
88 traversed the target vector. This would be terribly impolite
89 behaviour for a sun4 hosted remote gdb.
91 A fix might be to move this code into the "info registers" command.
92 rich@cygnus.com 15 Sept 92. */
95 struct user u
; /* just for address computations */
97 /* fpstate defined in <sys/user.h> */
98 struct fpstate
*fpstatep
;
99 char buf
[sizeof (struct fpstate
) + 2 * sizeof (int)];
102 unsigned int rounded_addr
;
103 unsigned int rounded_size
;
107 uaddr
= (char *)&u
.u_fpvalid
- (char *)&u
;
108 if (target_has_execution
)
113 rounded_addr
= uaddr
& -sizeof (int);
114 data
= ptrace (3, inferior_pid
, (PTRACE_ARG3_TYPE
) rounded_addr
, 0);
115 mask
= 0xff << ((uaddr
- rounded_addr
) * 8);
117 fpvalid
= ((data
& mask
) != 0);
122 if (lseek (corechan
, uaddr
, 0) < 0)
123 perror ("seek on core file");
124 if (myread (corechan
, &fpvalid
, 1) < 0)
125 perror ("read on core file");
128 #endif /* no core support yet */
132 printf ("no floating point status saved\n");
136 uaddr
= (char *)&U_FPSTATE(u
) - (char *)&u
;
137 if (target_has_execution
)
141 rounded_addr
= uaddr
& -sizeof (int);
142 rounded_size
= (((uaddr
+ sizeof (struct fpstate
)) - uaddr
) +
143 sizeof (int) - 1) / sizeof (int);
144 skip
= uaddr
- rounded_addr
;
147 for (i
= 0; i
< rounded_size
; i
++)
149 *ip
++ = ptrace (3, inferior_pid
, (PTRACE_ARG3_TYPE
) rounded_addr
, 0);
150 rounded_addr
+= sizeof (int);
156 if (lseek (corechan
, uaddr
, 0) < 0)
157 perror_with_name ("seek on core file");
158 if (myread (corechan
, buf
, sizeof (struct fpstate
)) < 0)
159 perror_with_name ("read from core file");
164 fpstatep
= (struct fpstate
*)(buf
+ skip
);
165 print_387_status (fpstatep
->status
, (struct env387
*)fpstatep
->state
);