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/tmp/gdb-7.10/gdb/i386nbsd-nat.c
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1 /* Native-dependent code for NetBSD/i386.
2 
3  Copyright (C) 2004-2015 Free Software Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>. */
19 
20 #include "defs.h"
21 #include "gdbcore.h"
22 #include "regcache.h"
23 #include "target.h"
24 
25 #include "i386-tdep.h"
26 #include "i386bsd-nat.h"
27 
28 /* Support for debugging kernel virtual memory images. */
29 
30 #include <sys/types.h>
31 #include <machine/frame.h>
32 #include <machine/pcb.h>
33 
34 #include "nbsd-nat.h"
35 #include "bsd-kvm.h"
36 
37 static int
38 i386nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
39 {
40  struct switchframe sf;
41 
42  /* The following is true for NetBSD 1.6.2:
43 
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
47  following layout:
48 
49  interrupt level
50  %edi
51  %esi
52  %ebx
53  %eip
54 
55  we reconstruct the register state as it would look when we just
56  returned from cpu_switch(). */
57 
58  /* The stack pointer shouldn't be zero. */
59  if (pcb->pcb_esp == 0)
60  return 0;
61 
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);
70 
71  return 1;
72 }
73 
74 
75 /* Provide a prototype to silence -Wmissing-prototypes. */
76 void _initialize_i386nbsd_nat (void);
77 
78 void
80 {
81  struct target_ops *t;
82 
83  /* Add some extra features to the common *BSD/i386 target. */
84  t = i386bsd_target ();
86  add_target (t);
87 
88  /* Support debugging kernel virtual memory images. */
90 }
struct target_ops * i386bsd_target(void)
Definition: i386bsd-nat.c:282
void add_target(struct target_ops *t)
Definition: target.c:395
char * nbsd_pid_to_exec_file(struct target_ops *self, int pid)
Definition: nbsd-nat.c:28
static int i386nbsd_supply_pcb(struct regcache *regcache, struct pcb *pcb)
Definition: i386nbsd-nat.c:38
void _initialize_i386nbsd_nat(void)
Definition: i386nbsd-nat.c:79
void read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition: corefile.c:244
char *(* to_pid_to_exec_file)(struct target_ops *, int pid) TARGET_DEFAULT_RETURN(NULL)
Definition: target.h:644
bfd_byte gdb_byte
Definition: common-types.h:38
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1041
void bsd_kvm_add_target(int(*supply_pcb)(struct regcache *, struct pcb *))
Definition: bsd-kvm.c:351