1 /* Native-dependent code for NetBSD/i386.
3 Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "i386-tdep.h"
27 #include "i386bsd-nat.h"
29 /* Support for debugging kernel virtual memory images. */
31 #include <sys/types.h>
32 #include <machine/frame.h>
33 #include <machine/pcb.h>
39 i386nbsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
41 struct switchframe sf
;
43 /* The following is true for NetBSD 1.6.2:
45 The pcb contains %esp and %ebp at the point of the context switch
46 in cpu_switch(). At that point we have a stack frame as
47 described by `struct switchframe', which for NetBSD 1.6.2 has the
56 we reconstruct the register state as it would look when we just
57 returned from cpu_switch(). */
59 /* The stack pointer shouldn't be zero. */
60 if (pcb
->pcb_esp
== 0)
63 read_memory (pcb
->pcb_esp
, (gdb_byte
*)&sf
, sizeof sf
);
64 pcb
->pcb_esp
+= sizeof (struct switchframe
);
65 regcache_raw_supply (regcache
, I386_EDI_REGNUM
, &sf
.sf_edi
);
66 regcache_raw_supply (regcache
, I386_ESI_REGNUM
, &sf
.sf_esi
);
67 regcache_raw_supply (regcache
, I386_EBP_REGNUM
, &pcb
->pcb_ebp
);
68 regcache_raw_supply (regcache
, I386_ESP_REGNUM
, &pcb
->pcb_esp
);
69 regcache_raw_supply (regcache
, I386_EBX_REGNUM
, &sf
.sf_ebx
);
70 regcache_raw_supply (regcache
, I386_EIP_REGNUM
, &sf
.sf_eip
);
76 /* Provide a prototype to silence -Wmissing-prototypes. */
77 void _initialize_i386nbsd_nat (void);
80 _initialize_i386nbsd_nat (void)
84 /* Add some extra features to the common *BSD/i386 target. */
85 t
= i386bsd_target ();
86 t
->to_pid_to_exec_file
= nbsd_pid_to_exec_file
;
89 /* Support debugging kernel virtual memory images. */
90 bsd_kvm_add_target (i386nbsd_supply_pcb
);
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