1 /* Machine-dependent code for host Mach 386's for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1991 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 #if defined (GDB_TARGET_IS_MACH386)
29 #include <sys/param.h>
33 #include <sys/ioctl.h>
36 #include <sys/ptrace.h>
37 #include <machine/reg.h>
44 fetch_inferior_registers ()
46 struct regs inferior_registers
;
47 struct fp_state inferior_fp_registers
;
48 extern char registers
[];
52 ptrace (PTRACE_GETREGS
, inferior_pid
, &inferior_registers
);
53 ptrace (PTRACE_GETFPREGS
, inferior_pid
, &inferior_fp_registers
);
55 bcopy (&inferior_registers
, registers
, sizeof inferior_registers
);
57 bcopy (inferior_fp_registers
.f_st
,®isters
[REGISTER_BYTE (FP0_REGNUM
)],
58 sizeof inferior_fp_registers
.f_st
);
59 bcopy (&inferior_fp_registers
.f_ctrl
,
60 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
61 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
64 /* Store our register values back into the inferior.
65 If REGNO is -1, do this for all registers.
66 Otherwise, REGNO specifies which register (so we can save time). */
68 store_inferior_registers (regno
)
71 struct regs inferior_registers
;
72 struct fp_state inferior_fp_registers
;
73 extern char registers
[];
75 bcopy (registers
, &inferior_registers
, 20 * 4);
77 bcopy (®isters
[REGISTER_BYTE (FP0_REGNUM
)],inferior_fp_registers
.f_st
,
78 sizeof inferior_fp_registers
.f_st
);
79 bcopy (®isters
[REGISTER_BYTE (FPC_REGNUM
)],
80 &inferior_fp_registers
.f_ctrl
,
81 sizeof inferior_fp_registers
- sizeof inferior_fp_registers
.f_st
);
84 if (regno
== FP_REGNUM
|| regno
== -1)
85 /* Storing the frame pointer requires a gross hack, in which an
86 instruction that moves eax into ebp gets single-stepped. */
88 int stack
= inferior_registers
.r_reg
[SP_REGNUM
];
89 int stuff
= ptrace (PTRACE_PEEKDATA
, inferior_pid
, stack
);
90 int reg
= inferior_registers
.r_reg
[EAX
];
91 inferior_registers
.r_reg
[EAX
] =
92 inferior_registers
.r_reg
[FP_REGNUM
];
93 ptrace (PTRACE_SETREGS
, inferior_pid
, &inferior_registers
);
94 ptrace (PTRACE_POKEDATA
, inferior_pid
, stack
, 0xc589);
95 ptrace (PTRACE_SINGLESTEP
, inferior_pid
, stack
, 0);
97 ptrace (PTRACE_POKEDATA
, inferior_pid
, stack
, stuff
);
98 inferior_registers
.r_reg
[EAX
] = reg
;
101 ptrace (PTRACE_SETREGS
, inferior_pid
, &inferior_registers
);
102 ptrace (PTRACE_SETFPREGS
, inferior_pid
, &inferior_fp_registers
);
105 #else /* Not mach386 target. */
107 /* These functions shouldn't be called when we're cross-debugging. */
110 fetch_inferior_registers ()
115 store_inferior_registers (regno
)
120 #endif /* Not mach386 target. */
122 /* Work with core files, for GDB. */
125 fetch_core_registers (core_reg_sect
, core_reg_size
, which
)
127 unsigned core_reg_size
;
131 extern char registers
[];
136 bcopy (core_reg_sect
, registers
, core_reg_size
);
141 bcopy (core_reg_sect
,
142 ®isters
[REGISTER_BYTE (FP0_REGNUM
)],
143 core_reg_size
); /* FIXME, probably bogus */
146 bcopy (&corestr
.c_fpu
.f_fpstatus
.f_ctrl
,
147 ®isters
[REGISTER_BYTE (FPC_REGNUM
)],
148 sizeof corestr
.c_fpu
.f_fpstatus
-
149 sizeof corestr
.c_fpu
.f_fpstatus
.f_st
);