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6617b94e JG |
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. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
07427425 | 6 | This program is free software; you can redistribute it and/or modify |
6617b94e | 7 | it under the terms of the GNU General Public License as published by |
07427425 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
6617b94e | 10 | |
07427425 | 11 | This program is distributed in the hope that it will be useful, |
6617b94e JG |
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 | |
07427425 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
6617b94e | 19 | |
6617b94e | 20 | #include "defs.h" |
6617b94e JG |
21 | #include "frame.h" |
22 | #include "inferior.h" | |
6617b94e JG |
23 | #include "gdbcore.h" |
24 | ||
07427425 JG |
25 | #if defined (GDB_TARGET_IS_MACH386) |
26 | ||
6617b94e JG |
27 | #include <sys/param.h> |
28 | #include <sys/dir.h> | |
29 | #include <sys/user.h> | |
30 | #include <signal.h> | |
31 | #include <sys/ioctl.h> | |
32 | #include <fcntl.h> | |
33 | ||
34 | #include <sys/ptrace.h> | |
35 | #include <machine/reg.h> | |
36 | ||
37 | #include <sys/file.h> | |
38 | #include <sys/stat.h> | |
39 | #include <sys/core.h> | |
1ab3bf1b | 40 | |
6617b94e JG |
41 | \f |
42 | void | |
1ab3bf1b JG |
43 | fetch_inferior_registers (regno) |
44 | int regno; /* Original value discarded */ | |
6617b94e JG |
45 | { |
46 | struct regs inferior_registers; | |
47 | struct fp_state inferior_fp_registers; | |
48 | extern char registers[]; | |
49 | ||
50 | registers_fetched (); | |
51 | ||
e676a15f FF |
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); | |
6617b94e JG |
56 | |
57 | bcopy (&inferior_registers, registers, sizeof inferior_registers); | |
58 | ||
59 | bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)], | |
60 | sizeof inferior_fp_registers.f_st); | |
61 | bcopy (&inferior_fp_registers.f_ctrl, | |
62 | ®isters[REGISTER_BYTE (FPC_REGNUM)], | |
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 | ||
1ab3bf1b | 70 | void |
6617b94e JG |
71 | store_inferior_registers (regno) |
72 | int regno; | |
73 | { | |
74 | struct regs inferior_registers; | |
75 | struct fp_state inferior_fp_registers; | |
76 | extern char registers[]; | |
77 | ||
78 | bcopy (registers, &inferior_registers, 20 * 4); | |
79 | ||
80 | bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st, | |
81 | sizeof inferior_fp_registers.f_st); | |
82 | bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)], | |
83 | &inferior_fp_registers.f_ctrl, | |
84 | sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st); | |
85 | ||
86 | #ifdef PTRACE_FP_BUG | |
87 | if (regno == FP_REGNUM || regno == -1) | |
88 | /* Storing the frame pointer requires a gross hack, in which an | |
89 | instruction that moves eax into ebp gets single-stepped. */ | |
90 | { | |
91 | int stack = inferior_registers.r_reg[SP_REGNUM]; | |
e676a15f FF |
92 | int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, |
93 | (PTRACE_ARG3_TYPE) stack); | |
6617b94e JG |
94 | int reg = inferior_registers.r_reg[EAX]; |
95 | inferior_registers.r_reg[EAX] = | |
96 | inferior_registers.r_reg[FP_REGNUM]; | |
e676a15f FF |
97 | ptrace (PTRACE_SETREGS, inferior_pid, |
98 | (PTRACE_ARG3_TYPE) &inferior_registers); | |
99 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589); | |
100 | ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0); | |
6617b94e | 101 | wait (0); |
e676a15f | 102 | ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff); |
6617b94e JG |
103 | inferior_registers.r_reg[EAX] = reg; |
104 | } | |
105 | #endif | |
e676a15f FF |
106 | ptrace (PTRACE_SETREGS, inferior_pid, |
107 | (PTRACE_ARG3_TYPE) &inferior_registers); | |
108 | ptrace (PTRACE_SETFPREGS, inferior_pid, | |
109 | (PTRACE_ARG3_TYPE) &inferior_fp_registers); | |
6617b94e JG |
110 | } |
111 | ||
07427425 JG |
112 | #else /* Not mach386 target. */ |
113 | ||
114 | /* These functions shouldn't be called when we're cross-debugging. */ | |
115 | ||
1ab3bf1b | 116 | /* ARGSUSED */ |
07427425 | 117 | void |
1ab3bf1b JG |
118 | fetch_inferior_registers (regno) |
119 | int regno; | |
07427425 JG |
120 | { |
121 | } | |
122 | ||
123 | /* ARGSUSED */ | |
1ab3bf1b | 124 | void |
07427425 JG |
125 | store_inferior_registers (regno) |
126 | int regno; | |
127 | { | |
128 | } | |
129 | ||
130 | #endif /* Not mach386 target. */ | |
131 | ||
6617b94e JG |
132 | /* Work with core files, for GDB. */ |
133 | ||
6617b94e | 134 | void |
1ab3bf1b | 135 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
6617b94e JG |
136 | char *core_reg_sect; |
137 | unsigned core_reg_size; | |
138 | int which; | |
1ab3bf1b | 139 | unsigned int reg_addr; /* Unused in this version */ |
6617b94e JG |
140 | { |
141 | int val; | |
142 | extern char registers[]; | |
143 | ||
144 | switch (which) { | |
145 | case 0: | |
146 | case 1: | |
147 | bcopy (core_reg_sect, registers, core_reg_size); | |
148 | break; | |
149 | ||
150 | case 2: | |
07427425 | 151 | #ifdef FP0_REGNUM |
6617b94e JG |
152 | bcopy (core_reg_sect, |
153 | ®isters[REGISTER_BYTE (FP0_REGNUM)], | |
154 | core_reg_size); /* FIXME, probably bogus */ | |
07427425 JG |
155 | #endif |
156 | #ifdef FPC_REGNUM | |
6617b94e JG |
157 | bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl, |
158 | ®isters[REGISTER_BYTE (FPC_REGNUM)], | |
159 | sizeof corestr.c_fpu.f_fpstatus - | |
160 | sizeof corestr.c_fpu.f_fpstatus.f_st); | |
161 | #endif | |
162 | break; | |
163 | } | |
164 | } |