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9062529b MK |
1 | /* Native-dependent code for NetBSD/i386. |
2 | ||
6aba47ca | 3 | Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc. |
9062529b MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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 | |
197e01b6 EZ |
19 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
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21 | |
22 | #include "defs.h" | |
23 | #include "gdbcore.h" | |
24 | #include "regcache.h" | |
9692934b | 25 | #include "target.h" |
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26 | |
27 | #include "i386-tdep.h" | |
9692934b | 28 | #include "i386bsd-nat.h" |
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29 | |
30 | /* Support for debugging kernel virtual memory images. */ | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include <machine/frame.h> | |
34 | #include <machine/pcb.h> | |
35 | ||
84c5b489 | 36 | #include "nbsd-nat.h" |
9062529b MK |
37 | #include "bsd-kvm.h" |
38 | ||
39 | static int | |
40 | i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
41 | { | |
42 | struct switchframe sf; | |
43 | ||
44 | /* The following is true for NetBSD 1.6.2: | |
45 | ||
46 | The pcb contains %esp and %ebp at the point of the context switch | |
47 | in cpu_switch(). At that point we have a stack frame as | |
48 | described by `struct switchframe', which for NetBSD 1.6.2 has the | |
49 | following layout: | |
50 | ||
51 | interrupt level | |
52 | %edi | |
53 | %esi | |
54 | %ebx | |
55 | %eip | |
56 | ||
57 | we reconstruct the register state as it would look when we just | |
58 | returned from cpu_switch(). */ | |
59 | ||
60 | /* The stack pointer shouldn't be zero. */ | |
61 | if (pcb->pcb_esp == 0) | |
62 | return 0; | |
63 | ||
df80278b | 64 | read_memory (pcb->pcb_esp, (gdb_byte *)&sf, sizeof sf); |
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65 | pcb->pcb_esp += sizeof (struct switchframe); |
66 | regcache_raw_supply (regcache, I386_EDI_REGNUM, &sf.sf_edi); | |
67 | regcache_raw_supply (regcache, I386_ESI_REGNUM, &sf.sf_esi); | |
68 | regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp); | |
69 | regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp); | |
70 | regcache_raw_supply (regcache, I386_EBX_REGNUM, &sf.sf_ebx); | |
71 | regcache_raw_supply (regcache, I386_EIP_REGNUM, &sf.sf_eip); | |
72 | ||
73 | return 1; | |
74 | } | |
75 | \f | |
76 | ||
77 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
78 | void _initialize_i386nbsd_nat (void); | |
79 | ||
80 | void | |
81 | _initialize_i386nbsd_nat (void) | |
82 | { | |
84c5b489 | 83 | struct target_ops *t; |
9692934b | 84 | |
84c5b489 MK |
85 | /* Add some extra features to the common *BSD/i386 target. */ |
86 | t = i386bsd_target (); | |
87 | t->to_pid_to_exec_file = nbsd_pid_to_exec_file; | |
88 | add_target (t); | |
89 | ||
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90 | /* Support debugging kernel virtual memory images. */ |
91 | bsd_kvm_add_target (i386nbsd_supply_pcb); | |
92 | } |