1 /* Native dependent code for Mach 386's for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1995, 1996, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 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>
42 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR
);
45 fetch_inferior_registers (int regno
)
47 struct regs inferior_registers
;
48 struct fp_state inferior_fp_registers
;
52 ptrace (PTRACE_GETREGS
, inferior_pid
,
53 (PTRACE_ARG3_TYPE
) & inferior_registers
);
54 ptrace (PTRACE_GETFPREGS
, inferior_pid
,
55 (PTRACE_ARG3_TYPE
) & inferior_fp_registers
);
57 memcpy (registers
, &inferior_registers
, sizeof inferior_registers
);
59 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],
60 inferior_fp_registers
.f_st
,
61 sizeof inferior_fp_registers
.f_st
);
62 memcpy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
63 &inferior_fp_registers
.f_ctrl
,
64 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
67 /* Store our register values back into the inferior.
68 If REGNO is -1, do this for all registers.
69 Otherwise, REGNO specifies which register (so we can save time). */
72 store_inferior_registers (int 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 /* Provide registers to GDB from a core file.
115 CORE_REG_SECT points to an array of bytes, which were obtained from
116 a core file which BFD thinks might contain register contents.
117 CORE_REG_SIZE is its size.
119 WHICH says which register set corelow suspects this is:
120 0 --- the general-purpose register set
121 2 --- the floating-point register set
123 REG_ADDR isn't used. */
126 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
127 int which
, CORE_ADDR reg_addr
)
135 memcpy (registers
, core_reg_sect
, core_reg_size
);
139 memcpy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],
141 core_reg_size
); /* FIXME, probably bogus */
143 memcpy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
144 &corestr
.c_fpu
.f_fpstatus
.f_ctrl
,
145 sizeof corestr
.c_fpu
.f_fpstatus
-
146 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);
153 /* Register that we are able to handle i386mach core file formats.
154 FIXME: is this really bfd_target_unknown_flavour? */
156 static struct core_fns i386mach_core_fns
=
158 bfd_target_unknown_flavour
, /* core_flavour */
159 default_check_format
, /* check_format */
160 default_core_sniffer
, /* core_sniffer */
161 fetch_core_registers
, /* core_read_registers */
166 _initialize_core_i386mach (void)
168 add_core_fns (&i386mach_core_fns
);