1 /* Machine-dependent code for host Sun 386i's for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1991 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 GDB 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 1, or (at your option)
13 GDB 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 GDB; see the file COPYING. If not, write to
20 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
30 #include <sys/param.h>
34 #include <sys/ioctl.h>
37 #include <sys/ptrace.h>
38 #include <machine/reg.h>
45 fetch_inferior_registers ()
47 struct regs inferior_registers
;
48 struct fp_state inferior_fp_registers
;
49 extern char registers
[];
53 ptrace (PTRACE_GETREGS
, inferior_pid
, &inferior_registers
);
54 ptrace (PTRACE_GETFPREGS
, inferior_pid
, &inferior_fp_registers
);
56 bcopy (&inferior_registers
, registers
, sizeof inferior_registers
);
58 bcopy (inferior_fp_registers
.f_st
,®isters
[REGISTER_BYTE (FP0_REGNUM
)],
59 sizeof inferior_fp_registers
.f_st
);
60 bcopy (&inferior_fp_registers
.f_ctrl
,
61 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
62 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
65 /* Store our register values back into the inferior.
66 If REGNO is -1, do this for all registers.
67 Otherwise, REGNO specifies which register (so we can save time). */
69 store_inferior_registers (regno
)
72 struct regs inferior_registers
;
73 struct fp_state inferior_fp_registers
;
74 extern char registers
[];
76 bcopy (registers
, &inferior_registers
, 20 * 4);
78 bcopy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],inferior_fp_registers
.f_st
,
79 sizeof inferior_fp_registers
.f_st
);
80 bcopy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
81 &inferior_fp_registers
.f_ctrl
,
82 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
85 if (regno
== FP_REGNUM
|| regno
== -1)
86 /* Storing the frame pointer requires a gross hack, in which an
87 instruction that moves eax into ebp gets single-stepped. */
89 int stack
= inferior_registers
.r_reg
[SP_REGNUM
];
90 int stuff
= ptrace (PTRACE_PEEKDATA
, inferior_pid
, stack
);
91 int reg
= inferior_registers
.r_reg
[EAX
];
92 inferior_registers
.r_reg
[EAX
] =
93 inferior_registers
.r_reg
[FP_REGNUM
];
94 ptrace (PTRACE_SETREGS
, inferior_pid
, &inferior_registers
);
95 ptrace (PTRACE_POKEDATA
, inferior_pid
, stack
, 0xc589);
96 ptrace (PTRACE_SINGLESTEP
, inferior_pid
, stack
, 0);
98 ptrace (PTRACE_POKEDATA
, inferior_pid
, stack
, stuff
);
99 inferior_registers
.r_reg
[EAX
] = reg
;
102 ptrace (PTRACE_SETREGS
, inferior_pid
, &inferior_registers
);
103 ptrace (PTRACE_SETFPREGS
, inferior_pid
, &inferior_fp_registers
);
106 /* Machine-dependent code which would otherwise be in core.c */
107 /* Work with core files, for GDB. */
111 core_file_command (filename
, from_tty
)
116 extern char registers
[];
118 /* Discard all vestiges of any previous core file
119 and mark data and stack spaces as empty. */
131 stack_start
= STACK_END_ADDR
;
132 stack_end
= STACK_END_ADDR
;
134 /* Now, if a new core file was specified, open it and digest it. */
138 filename
= tilde_expand (filename
);
139 make_cleanup (free
, filename
);
141 if (have_inferior_p ())
142 error ("To look at a core file, you must kill the inferior with \"kill\".");
143 corechan
= open (filename
, O_RDONLY
, 0);
145 perror_with_name (filename
);
150 val
= myread (corechan
, &corestr
, sizeof corestr
);
152 perror_with_name (filename
);
153 if (corestr
.c_magic
!= CORE_MAGIC
)
154 error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
155 filename
, corestr
.c_magic
, (int) CORE_MAGIC
);
156 else if (sizeof (struct core
) != corestr
.c_len
)
157 error ("\"%s\" has an invalid struct core length (%d, expected %d)",
158 filename
, corestr
.c_len
, (int) sizeof (struct core
));
160 data_start
= exec_data_start
;
161 data_end
= data_start
+ corestr
.c_dsize
;
162 stack_start
= stack_end
- corestr
.c_ssize
;
163 data_offset
= sizeof corestr
;
164 stack_offset
= sizeof corestr
+ corestr
.c_dsize
;
166 bcopy (&corestr
.c_regs
, registers
, sizeof corestr
.c_regs
);
168 bcopy (corestr
.c_fpu
.f_fpstatus
.f_st
,
169 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
170 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);
171 bcopy (&corestr
.c_fpu
.f_fpstatus
.f_ctrl
,
172 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
173 sizeof corestr
.c_fpu
.f_fpstatus
-
174 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);
176 /* the struct aouthdr of sun coff is not the struct exec stored
178 bcopy (&corestr
.c_aouthdr
, &core_aouthdr
, sizeof (struct exec
));
179 #ifndef COFF_ENCAPSULATE
180 core_aouthdr
.magic
= corestr
.c_aouthdr
.a_info
;
181 core_aouthdr
.vstamp
= /*SUNVERSION*/ 31252;
183 printf ("Core file is from \"%s\".\n", corestr
.c_cmdname
);
184 if (corestr
.c_signo
> 0)
185 printf ("Program terminated with signal %d, %s.\n",
187 corestr
.c_signo
< NSIG
188 ? sys_siglist
[corestr
.c_signo
]
191 if (filename
[0] == '/')
192 corefile
= savestring (filename
, strlen (filename
));
195 corefile
= concat (current_directory
, "/", filename
);
198 set_current_frame ( create_new_frame (read_register (FP_REGNUM
),
200 select_frame (get_current_frame (), 0);
205 printf ("No core file now.\n");
208 i387_to_double (from
, to
)
213 /* push extended mode on 387 stack, then pop in double mode
215 * first, set exception masks so no error is generated -
216 * number will be rounded to inf or 0, if necessary
218 asm ("pushl %eax"); /* grab a stack slot */
219 asm ("fstcw (%esp)"); /* get 387 control word */
220 asm ("movl (%esp),%eax"); /* save old value */
221 asm ("orl $0x3f,%eax"); /* mask all exceptions */
223 asm ("fldcw (%esp)"); /* load new value into 387 */
225 asm ("movl 8(%ebp),%eax");
226 asm ("fldt (%eax)"); /* push extended number on 387 stack */
228 asm ("movl 12(%ebp),%eax");
229 asm ("fstpl (%eax)"); /* pop double */
232 asm ("popl %eax"); /* flush modified control word */
233 asm ("fnclex"); /* clear exceptions */
234 asm ("fldcw (%esp)"); /* restore original control word */
235 asm ("popl %eax"); /* flush saved copy */
238 double_to_i387 (from
, to
)
242 /* push double mode on 387 stack, then pop in extended mode
243 * no errors are possible because every 64-bit pattern
244 * can be converted to an extended
246 asm ("movl 8(%ebp),%eax");
249 asm ("movl 12(%ebp),%eax");
250 asm ("fstpt (%eax)");