1 /* Native dependent code for Mach 386's for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 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., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
26 #include <sys/param.h>
30 #include <sys/ioctl.h>
33 #include <sys/ptrace.h>
34 #include <machine/reg.h>
40 static void fetch_core_registers
PARAMS ((char *, unsigned, int, CORE_ADDR
));
43 fetch_inferior_registers (regno
)
44 int regno
; /* Original value discarded */
46 struct regs inferior_registers
;
47 struct fp_state inferior_fp_registers
;
51 ptrace (PTRACE_GETREGS
, inferior_pid
,
52 (PTRACE_ARG3_TYPE
) & inferior_registers
);
53 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
54 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
56 memcpy (registers
, &inferior_registers
, sizeof inferior_registers
);
58 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],
59 inferior_fp_registers
.f_st
,
60 sizeof inferior_fp_registers
.f_st
);
61 memcpy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
62 &inferior_fp_registers
.f_ctrl
,
63 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
66 /* Store our register values back into the inferior.
67 If REGNO is -1, do this for all registers.
68 Otherwise, REGNO specifies which register (so we can save time). */
71 store_inferior_registers (regno
)
74 struct regs inferior_registers
;
75 struct fp_state inferior_fp_registers
;
77 memcpy (&inferior_registers
, registers
, 20 * 4);
79 memcpy (inferior_fp_registers
.f_st
, ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
80 sizeof inferior_fp_registers
.f_st
);
81 memcpy (&inferior_fp_registers
.f_ctrl
,
82 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
83 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
86 if (regno
== FP_REGNUM
|| regno
== -1)
87 /* Storing the frame pointer requires a gross hack, in which an
88 instruction that moves eax into ebp gets single-stepped. */
90 int stack
= inferior_registers
.r_reg
[SP_REGNUM
];
91 int stuff
= ptrace (PTRACE_PEEKDATA
, inferior_pid
,
92 (PTRACE_ARG3_TYPE
) stack
);
93 int reg
= inferior_registers
.r_reg
[EAX
];
94 inferior_registers
.r_reg
[EAX
] =
95 inferior_registers
.r_reg
[FP_REGNUM
];
96 ptrace (PTRACE_SETREGS
, inferior_pid
,
97 (PTRACE_ARG3_TYPE
) & inferior_registers
);
98 ptrace (PTRACE_POKEDATA
, inferior_pid
, (PTRACE_ARG3_TYPE
) stack
, 0xc589);
99 ptrace (PTRACE_SINGLESTEP
, inferior_pid
, (PTRACE_ARG3_TYPE
) stack
, 0);
101 ptrace (PTRACE_POKEDATA
, inferior_pid
, (PTRACE_ARG3_TYPE
) stack
, stuff
);
102 inferior_registers
.r_reg
[EAX
] = reg
;
105 ptrace (PTRACE_SETREGS
, inferior_pid
,
106 (PTRACE_ARG3_TYPE
) & inferior_registers
);
107 ptrace (PTRACE_SETFPREGS
, inferior_pid
,
108 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
113 /* Work with core files, for GDB. */
116 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
118 unsigned core_reg_size
;
120 CORE_ADDR reg_addr
; /* Unused in this version */
128 memcpy (registers
, core_reg_sect
, core_reg_size
);
133 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],
135 core_reg_size
); /* FIXME, probably bogus */
138 memcpy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
139 &corestr
.c_fpu
.f_fpstatus
.f_ctrl
,
140 sizeof corestr
.c_fpu
.f_fpstatus
-
141 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);
148 /* Register that we are able to handle i386mach core file formats.
149 FIXME: is this really bfd_target_unknown_flavour? */
151 static struct core_fns i386mach_core_fns
=
153 bfd_target_unknown_flavour
,
154 fetch_core_registers
,
159 _initialize_core_i386mach ()
161 add_core_fns (&i386mach_core_fns
);