1 /* Extract registers from a "standard" core file, for GDB.
2 Copyright (C) 1988-1991 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* core.c is supposed to be the more machine-independent aspects of this;
21 this file is more machine-specific. */
24 #include <sys/types.h>
25 #include <sys/param.h>
29 /* These are needed on various systems to expand REGISTER_U_ADDR. */
35 #include <sys/ptrace.h>
39 /* Extract the register values out of the core file and store
40 them where `read_register' will find them.
42 CORE_REG_SECT points to the register values themselves, read into memory.
43 CORE_REG_SIZE is the size of that area.
44 WHICH says which set of registers we are handling (0 = int, 2 = float
45 on machines where they are discontiguous).
46 REG_ADDR is the offset from u.u_ar0 to the register values relative to
47 core_reg_sect. This is used with old-fashioned core files to
48 locate the registers in a large upage-plus-stack ".reg" section.
49 Original upage address X is at location core_reg_sect+x+reg_addr.
53 fetch_core_registers (core_reg_sect
, core_reg_size
, which
, reg_addr
)
55 unsigned core_reg_size
;
60 register unsigned int addr
;
62 register reg_ptr
= -reg_addr
; /* Original u.u_ar0 is -reg_addr. */
64 /* If u.u_ar0 was an absolute address in the core file, relativize it now,
65 so we can use it as an offset into core_reg_sect. When we're done,
66 "register 0" will be at core_reg_sect+reg_ptr, and we can use
67 register_addr to offset to the other registers. If this is a modern
68 core file without a upage, reg_ptr will be zero and this is all a big
70 if (reg_ptr
> core_reg_size
)
71 reg_ptr
-= KERNEL_U_ADDR
;
72 if (reg_ptr
> core_reg_size
)
73 fprintf (stderr
, "Can't find registers in core file\n");
75 for (regno
= 0; regno
< NUM_REGS
; regno
++)
77 addr
= register_addr (regno
, reg_ptr
);
78 if (addr
>= core_reg_size
) {
82 supply_register (regno
, core_reg_sect
+ addr
);
87 error ("Register %s not found in core file.", reg_names
[bad_reg
]);
92 #ifdef REGISTER_U_ADDR
94 /* Return the address in the core dump or inferior of register REGNO.
95 BLOCKEND is the address of the end of the user structure. */
98 register_addr (regno
, blockend
)
104 if (regno
< 0 || regno
>= NUM_REGS
)
105 error ("Invalid register number %d.", regno
);
107 REGISTER_U_ADDR (addr
, blockend
, regno
);
112 #endif /* REGISTER_U_ADDR */
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