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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.
3
4 This file is part of GDB.
5
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.
10
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.
15
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. */
20
21 #include "defs.h"
22 #include "frame.h"
23 #include "inferior.h"
24 #include "gdbcore.h"
25
26 #include <sys/param.h>
27 #include <sys/dir.h>
28 #include <sys/user.h>
29 #include <signal.h>
30 #include <sys/ioctl.h>
31 #include <fcntl.h>
32
33 #include <sys/ptrace.h>
34 #include <machine/reg.h>
35
36 #include <sys/file.h>
37 #include "gdb_stat.h"
38 #include <sys/core.h>
39
40 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
41
42 void
43 fetch_inferior_registers (regno)
44 int regno; /* Original value discarded */
45 {
46 struct regs inferior_registers;
47 struct fp_state inferior_fp_registers;
48
49 registers_fetched ();
50
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);
55
56 memcpy (registers, &inferior_registers, sizeof inferior_registers);
57
58 memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
59 inferior_fp_registers.f_st,
60 sizeof inferior_fp_registers.f_st);
61 memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
62 &inferior_fp_registers.f_ctrl,
63 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
64 }
65
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). */
69
70 void
71 store_inferior_registers (regno)
72 int regno;
73 {
74 struct regs inferior_registers;
75 struct fp_state inferior_fp_registers;
76
77 memcpy (&inferior_registers, registers, 20 * 4);
78
79 memcpy (inferior_fp_registers.f_st, &registers[REGISTER_BYTE (FP0_REGNUM)],
80 sizeof inferior_fp_registers.f_st);
81 memcpy (&inferior_fp_registers.f_ctrl,
82 &registers[REGISTER_BYTE (FPC_REGNUM)],
83 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
84
85 #ifdef PTRACE_FP_BUG
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. */
89 {
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);
100 wait (0);
101 ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff);
102 inferior_registers.r_reg[EAX] = reg;
103 }
104 #endif
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);
109 }
110
111
112
113 /* Work with core files, for GDB. */
114
115 static void
116 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
117 char *core_reg_sect;
118 unsigned core_reg_size;
119 int which;
120 CORE_ADDR reg_addr; /* Unused in this version */
121 {
122 int val;
123
124 switch (which)
125 {
126 case 0:
127 case 1:
128 memcpy (registers, core_reg_sect, core_reg_size);
129 break;
130
131 case 2:
132 #ifdef FP0_REGNUM
133 memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
134 core_reg_sect,
135 core_reg_size); /* FIXME, probably bogus */
136 #endif
137 #ifdef FPC_REGNUM
138 memcpy (&registers[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);
142 #endif
143 break;
144 }
145 }
146 \f
147
148 /* Register that we are able to handle i386mach core file formats.
149 FIXME: is this really bfd_target_unknown_flavour? */
150
151 static struct core_fns i386mach_core_fns =
152 {
153 bfd_target_unknown_flavour,
154 fetch_core_registers,
155 NULL
156 };
157
158 void
159 _initialize_core_i386mach ()
160 {
161 add_core_fns (&i386mach_core_fns);
162 }