1 /* Native-dependent code for NetBSD/i386.
3 Copyright 2004 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "i386-tdep.h"
28 /* Support for debugging kernel virtual memory images. */
30 #include <sys/types.h>
31 #include <machine/frame.h>
32 #include <machine/pcb.h>
37 i386nbsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
39 struct switchframe sf
;
41 /* The following is true for NetBSD 1.6.2:
43 The pcb contains %esp and %ebp at the point of the context switch
44 in cpu_switch(). At that point we have a stack frame as
45 described by `struct switchframe', which for NetBSD 1.6.2 has the
54 we reconstruct the register state as it would look when we just
55 returned from cpu_switch(). */
57 /* The stack pointer shouldn't be zero. */
58 if (pcb
->pcb_esp
== 0)
61 read_memory (pcb
->pcb_esp
, (char *) &sf
, sizeof sf
);
62 pcb
->pcb_esp
+= sizeof (struct switchframe
);
63 regcache_raw_supply (regcache
, I386_EDI_REGNUM
, &sf
.sf_edi
);
64 regcache_raw_supply (regcache
, I386_ESI_REGNUM
, &sf
.sf_esi
);
65 regcache_raw_supply (regcache
, I386_EBP_REGNUM
, &pcb
->pcb_ebp
);
66 regcache_raw_supply (regcache
, I386_ESP_REGNUM
, &pcb
->pcb_esp
);
67 regcache_raw_supply (regcache
, I386_EBX_REGNUM
, &sf
.sf_ebx
);
68 regcache_raw_supply (regcache
, I386_EIP_REGNUM
, &sf
.sf_eip
);
74 /* Provide a prototype to silence -Wmissing-prototypes. */
75 void _initialize_i386nbsd_nat (void);
78 _initialize_i386nbsd_nat (void)
80 /* Support debugging kernel virtual memory images. */
81 bsd_kvm_add_target (i386nbsd_supply_pcb
);
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