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[thirdparty/binutils-gdb.git] / gdb / core-aout.c
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c906108c
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1/* Extract registers from a "standard" core file, for GDB.
2 Copyright (C) 1988-1998 Free Software Foundation, Inc.
3
c5aa993b 4 This file is part of GDB.
c906108c 5
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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
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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
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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. */
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20
21/* Typically used on systems that have a.out format executables.
22 corefile.c is supposed to contain the more machine-independent
23 aspects of reading registers from core files, while this file is
24 more machine specific. */
25
26#include "defs.h"
27
28#ifdef HAVE_PTRACE_H
c5aa993b 29#include <ptrace.h>
c906108c 30#else
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31#ifdef HAVE_SYS_PTRACE_H
32#include <sys/ptrace.h>
33#endif
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34#endif
35
36#include <sys/types.h>
37#include <sys/param.h>
38#include "gdbcore.h"
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39#include "value.h" /* For supply_register. */
40#include "inferior.h" /* For ARCH_NUM_REGS. */
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41
42/* These are needed on various systems to expand REGISTER_U_ADDR. */
43#ifndef USG
44#include <sys/dir.h>
45#include <sys/file.h>
46#include "gdb_stat.h"
47#include <sys/user.h>
48#endif
49
50#ifndef CORE_REGISTER_ADDR
51#define CORE_REGISTER_ADDR(regno, regptr) register_addr(regno, regptr)
52#endif /* CORE_REGISTER_ADDR */
53
54#ifdef NEED_SYS_CORE_H
55#include <sys/core.h>
56#endif
57
58static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
59
60void _initialize_core_aout PARAMS ((void));
61
62/* Extract the register values out of the core file and store
63 them where `read_register' will find them.
64
65 CORE_REG_SECT points to the register values themselves, read into memory.
66 CORE_REG_SIZE is the size of that area.
67 WHICH says which set of registers we are handling (0 = int, 2 = float
c5aa993b 68 on machines where they are discontiguous).
c906108c 69 REG_ADDR is the offset from u.u_ar0 to the register values relative to
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70 core_reg_sect. This is used with old-fashioned core files to
71 locate the registers in a large upage-plus-stack ".reg" section.
72 Original upage address X is at location core_reg_sect+x+reg_addr.
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73 */
74
75static void
76fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
77 char *core_reg_sect;
78 unsigned core_reg_size;
79 int which;
80 CORE_ADDR reg_addr;
81{
82 int regno;
83 CORE_ADDR addr;
84 int bad_reg = -1;
c5aa993b 85 CORE_ADDR reg_ptr = -reg_addr; /* Original u.u_ar0 is -reg_addr. */
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86 int numregs = ARCH_NUM_REGS;
87
88 /* If u.u_ar0 was an absolute address in the core file, relativize it now,
89 so we can use it as an offset into core_reg_sect. When we're done,
90 "register 0" will be at core_reg_sect+reg_ptr, and we can use
91 CORE_REGISTER_ADDR to offset to the other registers. If this is a modern
92 core file without a upage, reg_ptr will be zero and this is all a big
93 NOP. */
94 if (reg_ptr > core_reg_size)
95 reg_ptr -= KERNEL_U_ADDR;
96
97 for (regno = 0; regno < numregs; regno++)
98 {
99 addr = CORE_REGISTER_ADDR (regno, reg_ptr);
100 if (addr >= core_reg_size
101 && bad_reg < 0)
102 bad_reg = regno;
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103 else
104 supply_register (regno, core_reg_sect + addr);
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105 }
106
107 if (bad_reg >= 0)
108 error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
109}
110
111
112#ifdef REGISTER_U_ADDR
113
114/* Return the address in the core dump or inferior of register REGNO.
115 BLOCKEND is the address of the end of the user structure. */
116
117CORE_ADDR
118register_addr (regno, blockend)
119 int regno;
120 CORE_ADDR blockend;
121{
122 CORE_ADDR addr;
123
124 if (regno < 0 || regno >= ARCH_NUM_REGS)
125 error ("Invalid register number %d.", regno);
126
127 REGISTER_U_ADDR (addr, blockend, regno);
128
129 return addr;
130}
131
132#endif /* REGISTER_U_ADDR */
c906108c 133\f
c5aa993b 134
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135/* Register that we are able to handle aout (trad-core) file formats. */
136
137static struct core_fns aout_core_fns =
138{
139 bfd_target_unknown_flavour,
140 fetch_core_registers,
141 NULL
142};
143
144void
145_initialize_core_aout ()
146{
147 add_core_fns (&aout_core_fns);
148}