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c906108c SS |
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "gdbcore.h" | |
24 | ||
25 | #include <sys/param.h> | |
26 | #include <sys/dir.h> | |
27 | #include <sys/user.h> | |
28 | #include <signal.h> | |
29 | #include <sys/ioctl.h> | |
30 | #include <fcntl.h> | |
31 | ||
32 | #include <sys/ptrace.h> | |
33 | #include <machine/reg.h> | |
34 | ||
35 | #include <sys/file.h> | |
36 | #include "gdb_stat.h" | |
37 | #include <sys/core.h> | |
38 | ||
39 | static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); | |
40 | ||
41 | void | |
42 | fetch_inferior_registers (regno) | |
43 | int regno; /* Original value discarded */ | |
44 | { | |
45 | struct regs inferior_registers; | |
46 | struct fp_state inferior_fp_registers; | |
c906108c SS |
47 | |
48 | registers_fetched (); | |
49 | ||
50 | ptrace (PTRACE_GETREGS, inferior_pid, | |
51 | (PTRACE_ARG3_TYPE) &inferior_registers); | |
52 | ptrace (PTRACE_GETFPREGS, inferior_pid, | |
53 | (PTRACE_ARG3_TYPE) &inferior_fp_registers); | |
54 | ||
55 | memcpy (registers, &inferior_registers, sizeof inferior_registers); | |
56 | ||
57 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], | |
58 | inferior_fp_registers.f_st, | |
59 | sizeof inferior_fp_registers.f_st); | |
60 | memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], | |
61 | &inferior_fp_registers.f_ctrl, | |
62 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
63 | } | |
64 | ||
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). */ | |
68 | ||
69 | void | |
70 | store_inferior_registers (regno) | |
71 | int regno; | |
72 | { | |
73 | struct regs inferior_registers; | |
74 | struct fp_state inferior_fp_registers; | |
c906108c SS |
75 | |
76 | memcpy (&inferior_registers, registers, 20 * 4); | |
77 | ||
78 | memcpy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)], | |
79 | sizeof inferior_fp_registers.f_st); | |
80 | memcpy (&inferior_fp_registers.f_ctrl, | |
81 | ®isters[REGISTER_BYTE (FPC_REGNUM)], | |
82 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
83 | ||
84 | #ifdef PTRACE_FP_BUG | |
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. */ | |
88 | { | |
89 | int stack = inferior_registers.r_reg[SP_REGNUM]; | |
90 | int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, | |
91 | (PTRACE_ARG3_TYPE) stack); | |
92 | int reg = inferior_registers.r_reg[EAX]; | |
93 | inferior_registers.r_reg[EAX] = | |
94 | inferior_registers.r_reg[FP_REGNUM]; | |
95 | ptrace (PTRACE_SETREGS, inferior_pid, | |
96 | (PTRACE_ARG3_TYPE) &inferior_registers); | |
97 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589); | |
98 | ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0); | |
99 | wait (0); | |
100 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff); | |
101 | inferior_registers.r_reg[EAX] = reg; | |
102 | } | |
103 | #endif | |
104 | ptrace (PTRACE_SETREGS, inferior_pid, | |
105 | (PTRACE_ARG3_TYPE) &inferior_registers); | |
106 | ptrace (PTRACE_SETFPREGS, inferior_pid, | |
107 | (PTRACE_ARG3_TYPE) &inferior_fp_registers); | |
108 | } | |
109 | ||
110 | ||
111 | ||
112 | /* Work with core files, for GDB. */ | |
113 | ||
114 | static void | |
115 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
116 | char *core_reg_sect; | |
117 | unsigned core_reg_size; | |
118 | int which; | |
119 | CORE_ADDR reg_addr; /* Unused in this version */ | |
120 | { | |
121 | int val; | |
c906108c SS |
122 | |
123 | switch (which) { | |
124 | case 0: | |
125 | case 1: | |
126 | memcpy (registers, core_reg_sect, core_reg_size); | |
127 | break; | |
128 | ||
129 | case 2: | |
130 | #ifdef FP0_REGNUM | |
131 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], | |
132 | core_reg_sect, | |
133 | core_reg_size); /* FIXME, probably bogus */ | |
134 | #endif | |
135 | #ifdef FPC_REGNUM | |
136 | memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], | |
137 | &corestr.c_fpu.f_fpstatus.f_ctrl, | |
138 | sizeof corestr.c_fpu.f_fpstatus - | |
139 | sizeof corestr.c_fpu.f_fpstatus.f_st); | |
140 | #endif | |
141 | break; | |
142 | } | |
143 | } | |
144 | ||
145 | \f | |
146 | /* Register that we are able to handle i386mach core file formats. | |
147 | FIXME: is this really bfd_target_unknown_flavour? */ | |
148 | ||
149 | static struct core_fns i386mach_core_fns = | |
150 | { | |
151 | bfd_target_unknown_flavour, | |
152 | fetch_core_registers, | |
153 | NULL | |
154 | }; | |
155 | ||
156 | void | |
157 | _initialize_core_i386mach () | |
158 | { | |
159 | add_core_fns (&i386mach_core_fns); | |
160 | } |