1 /* Native-dependent code for NetBSD/i386.
3 Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include "i386-tdep.h"
26 #include "i386bsd-nat.h"
28 /* Support for debugging kernel virtual memory images. */
30 #include <sys/types.h>
31 #include <machine/frame.h>
32 #include <machine/pcb.h>
38 i386nbsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
40 struct switchframe sf
;
42 /* The following is true for NetBSD 1.6.2:
44 The pcb contains %esp and %ebp at the point of the context switch
45 in cpu_switch(). At that point we have a stack frame as
46 described by `struct switchframe', which for NetBSD 1.6.2 has the
55 we reconstruct the register state as it would look when we just
56 returned from cpu_switch(). */
58 /* The stack pointer shouldn't be zero. */
59 if (pcb
->pcb_esp
== 0)
62 read_memory (pcb
->pcb_esp
, (gdb_byte
*)&sf
, sizeof sf
);
63 pcb
->pcb_esp
+= sizeof (struct switchframe
);
64 regcache_raw_supply (regcache
, I386_EDI_REGNUM
, &sf
.sf_edi
);
65 regcache_raw_supply (regcache
, I386_ESI_REGNUM
, &sf
.sf_esi
);
66 regcache_raw_supply (regcache
, I386_EBP_REGNUM
, &pcb
->pcb_ebp
);
67 regcache_raw_supply (regcache
, I386_ESP_REGNUM
, &pcb
->pcb_esp
);
68 regcache_raw_supply (regcache
, I386_EBX_REGNUM
, &sf
.sf_ebx
);
69 regcache_raw_supply (regcache
, I386_EIP_REGNUM
, &sf
.sf_eip
);
75 /* Provide a prototype to silence -Wmissing-prototypes. */
76 void _initialize_i386nbsd_nat (void);
79 _initialize_i386nbsd_nat (void)
83 /* Add some extra features to the common *BSD/i386 target. */
84 t
= i386bsd_target ();
85 t
->to_pid_to_exec_file
= nbsd_pid_to_exec_file
;
88 /* Support debugging kernel virtual memory images. */
89 bsd_kvm_add_target (i386nbsd_supply_pcb
);
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