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c906108c SS |
1 | /* Extract registers from a "standard" core file, for GDB. |
2 | Copyright (C) 1988-1998 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 | /* Typically used on systems that have a.out format executables. | |
21 | corefile.c is supposed to contain the more machine-independent | |
22 | aspects of reading registers from core files, while this file is | |
23 | more machine specific. */ | |
24 | ||
25 | #include "defs.h" | |
26 | ||
27 | #ifdef HAVE_PTRACE_H | |
28 | # include <ptrace.h> | |
29 | #else | |
30 | # ifdef HAVE_SYS_PTRACE_H | |
31 | # include <sys/ptrace.h> | |
32 | # endif | |
33 | #endif | |
34 | ||
35 | #include <sys/types.h> | |
36 | #include <sys/param.h> | |
37 | #include "gdbcore.h" | |
38 | #include "value.h" /* For supply_register. */ | |
39 | #include "inferior.h" /* For ARCH_NUM_REGS. */ | |
40 | ||
41 | /* These are needed on various systems to expand REGISTER_U_ADDR. */ | |
42 | #ifndef USG | |
43 | #include <sys/dir.h> | |
44 | #include <sys/file.h> | |
45 | #include "gdb_stat.h" | |
46 | #include <sys/user.h> | |
47 | #endif | |
48 | ||
49 | #ifndef CORE_REGISTER_ADDR | |
50 | #define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr) | |
51 | #endif /* CORE_REGISTER_ADDR */ | |
52 | ||
53 | #ifdef NEED_SYS_CORE_H | |
54 | #include <sys/core.h> | |
55 | #endif | |
56 | ||
57 | static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR)); | |
58 | ||
59 | void _initialize_core_aout PARAMS ((void)); | |
60 | ||
61 | /* Extract the register values out of the core file and store | |
62 | them where `read_register' will find them. | |
63 | ||
64 | CORE_REG_SECT points to the register values themselves, read into memory. | |
65 | CORE_REG_SIZE is the size of that area. | |
66 | WHICH says which set of registers we are handling (0 = int, 2 = float | |
67 | on machines where they are discontiguous). | |
68 | REG_ADDR is the offset from u.u_ar0 to the register values relative to | |
69 | core_reg_sect. This is used with old-fashioned core files to | |
70 | locate the registers in a large upage-plus-stack ".reg" section. | |
71 | Original upage address X is at location core_reg_sect+x+reg_addr. | |
72 | */ | |
73 | ||
74 | static void | |
75 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
76 | char *core_reg_sect; | |
77 | unsigned core_reg_size; | |
78 | int which; | |
79 | CORE_ADDR reg_addr; | |
80 | { | |
81 | int regno; | |
82 | CORE_ADDR addr; | |
83 | int bad_reg = -1; | |
84 | CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */ | |
85 | int numregs = ARCH_NUM_REGS; | |
86 | ||
87 | /* If u.u_ar0 was an absolute address in the core file, relativize it now, | |
88 | so we can use it as an offset into core_reg_sect. When we're done, | |
89 | "register 0" will be at core_reg_sect+reg_ptr, and we can use | |
90 | CORE_REGISTER_ADDR to offset to the other registers. If this is a modern | |
91 | core file without a upage, reg_ptr will be zero and this is all a big | |
92 | NOP. */ | |
93 | if (reg_ptr > core_reg_size) | |
94 | reg_ptr -= KERNEL_U_ADDR; | |
95 | ||
96 | for (regno = 0; regno < numregs; regno++) | |
97 | { | |
98 | addr = CORE_REGISTER_ADDR (regno, reg_ptr); | |
99 | if (addr >= core_reg_size | |
100 | && bad_reg < 0) | |
101 | bad_reg = regno; | |
102 | else | |
103 | supply_register (regno, core_reg_sect + addr); | |
104 | } | |
105 | ||
106 | if (bad_reg >= 0) | |
107 | error ("Register %s not found in core file.", REGISTER_NAME (bad_reg)); | |
108 | } | |
109 | ||
110 | ||
111 | #ifdef REGISTER_U_ADDR | |
112 | ||
113 | /* Return the address in the core dump or inferior of register REGNO. | |
114 | BLOCKEND is the address of the end of the user structure. */ | |
115 | ||
116 | CORE_ADDR | |
117 | register_addr (regno, blockend) | |
118 | int regno; | |
119 | CORE_ADDR blockend; | |
120 | { | |
121 | CORE_ADDR addr; | |
122 | ||
123 | if (regno < 0 || regno >= ARCH_NUM_REGS) | |
124 | error ("Invalid register number %d.", regno); | |
125 | ||
126 | REGISTER_U_ADDR (addr, blockend, regno); | |
127 | ||
128 | return addr; | |
129 | } | |
130 | ||
131 | #endif /* REGISTER_U_ADDR */ | |
132 | ||
133 | \f | |
134 | /* Register that we are able to handle aout (trad-core) file formats. */ | |
135 | ||
136 | static struct core_fns aout_core_fns = | |
137 | { | |
138 | bfd_target_unknown_flavour, | |
139 | fetch_core_registers, | |
140 | NULL | |
141 | }; | |
142 | ||
143 | void | |
144 | _initialize_core_aout () | |
145 | { | |
146 | add_core_fns (&aout_core_fns); | |
147 | } |