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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 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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. */ | |
c906108c SS |
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 | ||
a14ed312 | 40 | static void fetch_core_registers (char *, unsigned, int, CORE_ADDR); |
c906108c SS |
41 | |
42 | void | |
5c678a12 | 43 | fetch_inferior_registers (int regno) |
c906108c SS |
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, | |
c5aa993b | 51 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c | 52 | ptrace (PTRACE_GETFPREGS, inferior_pid, |
c5aa993b | 53 | (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
c906108c SS |
54 | |
55 | memcpy (registers, &inferior_registers, sizeof inferior_registers); | |
56 | ||
57 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], | |
c5aa993b JM |
58 | inferior_fp_registers.f_st, |
59 | sizeof inferior_fp_registers.f_st); | |
c906108c | 60 | memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], |
c5aa993b JM |
61 | &inferior_fp_registers.f_ctrl, |
62 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
c906108c SS |
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 | |
fba45db2 | 70 | store_inferior_registers (int regno) |
c906108c SS |
71 | { |
72 | struct regs inferior_registers; | |
73 | struct fp_state inferior_fp_registers; | |
c906108c SS |
74 | |
75 | memcpy (&inferior_registers, registers, 20 * 4); | |
76 | ||
c5aa993b JM |
77 | memcpy (inferior_fp_registers.f_st, ®isters[REGISTER_BYTE (FP0_REGNUM)], |
78 | sizeof inferior_fp_registers.f_st); | |
c906108c | 79 | memcpy (&inferior_fp_registers.f_ctrl, |
c5aa993b JM |
80 | ®isters[REGISTER_BYTE (FPC_REGNUM)], |
81 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
82 | ||
c906108c SS |
83 | #ifdef PTRACE_FP_BUG |
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. */ | |
87 | { | |
88 | int stack = inferior_registers.r_reg[SP_REGNUM]; | |
89 | int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, | |
90 | (PTRACE_ARG3_TYPE) stack); | |
91 | int reg = inferior_registers.r_reg[EAX]; | |
92 | inferior_registers.r_reg[EAX] = | |
93 | inferior_registers.r_reg[FP_REGNUM]; | |
94 | ptrace (PTRACE_SETREGS, inferior_pid, | |
c5aa993b | 95 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c SS |
96 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589); |
97 | ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0); | |
98 | wait (0); | |
99 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff); | |
100 | inferior_registers.r_reg[EAX] = reg; | |
101 | } | |
102 | #endif | |
103 | ptrace (PTRACE_SETREGS, inferior_pid, | |
c5aa993b | 104 | (PTRACE_ARG3_TYPE) & inferior_registers); |
c906108c | 105 | ptrace (PTRACE_SETFPREGS, inferior_pid, |
c5aa993b | 106 | (PTRACE_ARG3_TYPE) & inferior_fp_registers); |
c906108c SS |
107 | } |
108 | ||
109 | ||
110 | ||
5c678a12 KB |
111 | /* Provide registers to GDB from a core file. |
112 | ||
113 | CORE_REG_SECT points to an array of bytes, which were obtained from | |
114 | a core file which BFD thinks might contain register contents. | |
115 | CORE_REG_SIZE is its size. | |
116 | ||
117 | WHICH says which register set corelow suspects this is: | |
118 | 0 --- the general-purpose register set | |
119 | 2 --- the floating-point register set | |
120 | ||
121 | REG_ADDR isn't used. */ | |
c906108c SS |
122 | |
123 | static void | |
5c678a12 KB |
124 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, |
125 | int which, CORE_ADDR reg_addr) | |
c906108c SS |
126 | { |
127 | int val; | |
c906108c | 128 | |
c5aa993b JM |
129 | switch (which) |
130 | { | |
131 | case 0: | |
132 | case 1: | |
133 | memcpy (registers, core_reg_sect, core_reg_size); | |
134 | break; | |
c906108c | 135 | |
c5aa993b | 136 | case 2: |
c5aa993b JM |
137 | memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], |
138 | core_reg_sect, | |
139 | core_reg_size); /* FIXME, probably bogus */ | |
c906108c | 140 | #ifdef FPC_REGNUM |
c5aa993b JM |
141 | memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)], |
142 | &corestr.c_fpu.f_fpstatus.f_ctrl, | |
143 | sizeof corestr.c_fpu.f_fpstatus - | |
144 | sizeof corestr.c_fpu.f_fpstatus.f_st); | |
c906108c | 145 | #endif |
c5aa993b JM |
146 | break; |
147 | } | |
c906108c | 148 | } |
c906108c | 149 | \f |
c5aa993b | 150 | |
c906108c SS |
151 | /* Register that we are able to handle i386mach core file formats. |
152 | FIXME: is this really bfd_target_unknown_flavour? */ | |
153 | ||
154 | static struct core_fns i386mach_core_fns = | |
155 | { | |
2acceee2 JM |
156 | bfd_target_unknown_flavour, /* core_flavour */ |
157 | default_check_format, /* check_format */ | |
158 | default_core_sniffer, /* core_sniffer */ | |
159 | fetch_core_registers, /* core_read_registers */ | |
160 | NULL /* next */ | |
c906108c SS |
161 | }; |
162 | ||
163 | void | |
fba45db2 | 164 | _initialize_core_i386mach (void) |
c906108c SS |
165 | { |
166 | add_core_fns (&i386mach_core_fns); | |
167 | } |