1 /* Native support for Sun 386i's for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
3 Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
28 #include <sys/param.h>
32 #include <sys/ioctl.h>
35 #include <sys/ptrace.h>
36 #include <machine/reg.h>
43 /* Machine-dependent code which would otherwise be in corefile.c */
44 /* Work with core files, for GDB. */
48 core_file_command (filename
, from_tty
)
54 /* Discard all vestiges of any previous core file
55 and mark data and stack spaces as empty. */
67 stack_start
= STACK_END_ADDR
;
68 stack_end
= STACK_END_ADDR
;
70 /* Now, if a new core file was specified, open it and digest it. */
74 filename
= tilde_expand (filename
);
75 make_cleanup (free
, filename
);
77 if (have_inferior_p ())
78 error ("To look at a core file, you must kill the program with \"kill\".");
79 corechan
= open (filename
, O_RDONLY
, 0);
81 perror_with_name (filename
);
86 val
= myread (corechan
, &corestr
, sizeof corestr
);
88 perror_with_name (filename
);
89 if (corestr
.c_magic
!= CORE_MAGIC
)
90 error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
91 filename
, corestr
.c_magic
, (int) CORE_MAGIC
);
92 else if (sizeof (struct core
) != corestr
.c_len
)
93 error ("\"%s\" has an invalid struct core length (%d, expected %d)",
94 filename
, corestr
.c_len
, (int) sizeof (struct core
));
96 data_start
= exec_data_start
;
97 data_end
= data_start
+ corestr
.c_dsize
;
98 stack_start
= stack_end
- corestr
.c_ssize
;
99 data_offset
= sizeof corestr
;
100 stack_offset
= sizeof corestr
+ corestr
.c_dsize
;
102 memcpy (registers
, &corestr
.c_regs
, sizeof corestr
.c_regs
);
104 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],
105 corestr
.c_fpu
.f_fpstatus
.f_st
,
106 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);
107 memcpy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
108 &corestr
.c_fpu
.f_fpstatus
.f_ctrl
,
109 sizeof corestr
.c_fpu
.f_fpstatus
-
110 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);
112 /* the struct aouthdr of sun coff is not the struct exec stored
114 memcpy (&core_aouthdr
, &corestr
.c_aouthdr
, sizeof (struct exec
));
115 #ifndef COFF_ENCAPSULATE
116 core_aouthdr
.magic
= corestr
.c_aouthdr
.a_info
;
117 core_aouthdr
.vstamp
= /*SUNVERSION */ 31252;
119 printf_unfiltered ("Core file is from \"%s\".\n", corestr
.c_cmdname
);
120 if (corestr
.c_signo
> 0)
121 printf_unfiltered ("Program terminated with signal %d, %s.\n",
122 corestr
.c_signo
, safe_strsignal (corestr
.c_signo
));
124 if (filename
[0] == '/')
125 corefile
= savestring (filename
, strlen (filename
));
128 corefile
= concat (current_directory
, "/", filename
, NULL
);
131 flush_cached_frames ();
132 select_frame (get_current_frame (), 0);
137 printf_unfiltered ("No core file now.\n");
140 i387_to_double (from
, to
)
145 /* push extended mode on 387 stack, then pop in double mode
147 * first, set exception masks so no error is generated -
148 * number will be rounded to inf or 0, if necessary
150 asm ("pushl %eax"); /* grab a stack slot */
151 asm ("fstcw (%esp)"); /* get 387 control word */
152 asm ("movl (%esp),%eax"); /* save old value */
153 asm ("orl $0x3f,%eax"); /* mask all exceptions */
155 asm ("fldcw (%esp)"); /* load new value into 387 */
157 asm ("movl 8(%ebp),%eax");
158 asm ("fldt (%eax)"); /* push extended number on 387 stack */
160 asm ("movl 12(%ebp),%eax");
161 asm ("fstpl (%eax)"); /* pop double */
164 asm ("popl %eax"); /* flush modified control word */
165 asm ("fnclex"); /* clear exceptions */
166 asm ("fldcw (%esp)"); /* restore original control word */
167 asm ("popl %eax"); /* flush saved copy */
170 double_to_i387 (from
, to
)
174 /* push double mode on 387 stack, then pop in extended mode
175 * no errors are possible because every 64-bit pattern
176 * can be converted to an extended
178 asm ("movl 8(%ebp),%eax");
181 asm ("movl 12(%ebp),%eax");
182 asm ("fstpt (%eax)");
187 fetch_inferior_registers (regno
)
190 struct regs inferior_registers
;
191 struct fp_state inferior_fp_registers
;
193 registers_fetched ();
195 ptrace (PTRACE_GETREGS
, inferior_pid
,
196 (PTRACE_ARG3_TYPE
) & inferior_registers
);
197 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
198 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
200 memcpy (registers
, &inferior_registers
, sizeof inferior_registers
);
202 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)], inferior_fp_registers
.f_st
,
203 sizeof inferior_fp_registers
.f_st
);
204 memcpy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
205 &inferior_fp_registers
.f_ctrl
,
206 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
209 /* Store our register values back into the inferior.
210 If REGNO is -1, do this for all registers.
211 Otherwise, REGNO specifies which register (so we can save time). */
214 store_inferior_registers (regno
)
217 struct regs inferior_registers
;
218 struct fp_state inferior_fp_registers
;
220 memcpy (&inferior_registers
, registers
, 20 * 4);
222 memcpy (inferior_fp_registers
.f_st
,
223 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
224 sizeof inferior_fp_registers
.f_st
);
225 memcpy (&inferior_fp_registers
.f_ctrl
,
226 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
227 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
230 if (regno
== FP_REGNUM
|| regno
== -1)
231 /* Storing the frame pointer requires a gross hack, in which an
232 instruction that moves eax into ebp gets single-stepped. */
234 int stack
= inferior_registers
.r_reg
[SP_REGNUM
];
235 int stuff
= ptrace (PTRACE_PEEKDATA
, inferior_pid
,
236 (PTRACE_ARG3_TYPE
) stack
);
237 int reg
= inferior_registers
.r_reg
[EAX
];
238 inferior_registers
.r_reg
[EAX
] =
239 inferior_registers
.r_reg
[FP_REGNUM
];
240 ptrace (PTRACE_SETREGS
, inferior_pid
,
241 (PTRACE_ARG3_TYPE
) & inferior_registers
);
242 ptrace (PTRACE_POKEDATA
, inferior_pid
, (PTRACE_ARG3_TYPE
) stack
,
244 ptrace (PTRACE_SINGLESTEP
, inferior_pid
, (PTRACE_ARG3_TYPE
) stack
,
247 ptrace (PTRACE_POKEDATA
, inferior_pid
, (PTRACE_ARG3_TYPE
) stack
,
249 inferior_registers
.r_reg
[EAX
] = reg
;
252 ptrace (PTRACE_SETREGS
, inferior_pid
,
253 (PTRACE_ARG3_TYPE
) & inferior_registers
);
254 ptrace (PTRACE_SETFPREGS
, inferior_pid
,
255 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);