1 /* Native-dependent code for modern VAX BSD's.
2
3 Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5
6 This file is part of GDB.
7
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.
12
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.
17
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/>. */
20
21 #include "defs.h"
22 #include "inferior.h"
23 #include "regcache.h"
24 #include "target.h"
25
26 #include <sys/types.h>
27 #include <sys/ptrace.h>
28 #include <machine/reg.h>
29
30 #include "vax-tdep.h"
31 #include "inf-ptrace.h"
32
33 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
34
35 static void
vaxbsd_supply_gregset(struct regcache * regcache,const void * gregs)36 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
37 {
38 const gdb_byte *regs = gregs;
39 int regnum;
40
41 for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
42 regcache_raw_supply (regcache, regnum, regs + regnum * 4);
43 }
44
45 /* Collect the general-purpose registers from REGCACHE and store them
46 in GREGS. */
47
48 static void
vaxbsd_collect_gregset(const struct regcache * regcache,void * gregs,int regnum)49 vaxbsd_collect_gregset (const struct regcache *regcache,
50 void *gregs, int regnum)
51 {
52 gdb_byte *regs = gregs;
53 int i;
54
55 for (i = 0; i <= VAX_NUM_REGS; i++)
56 {
57 if (regnum == -1 || regnum == i)
58 regcache_raw_collect (regcache, i, regs + i * 4);
59 }
60 }
61
62
63 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
64 for all registers. */
65
66 static void
vaxbsd_fetch_inferior_registers(struct target_ops * ops,struct regcache * regcache,int regnum)67 vaxbsd_fetch_inferior_registers (struct target_ops *ops,
68 struct regcache *regcache, int regnum)
69 {
70 struct reg regs;
71
72 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
73 (PTRACE_TYPE_ARG3) ®s, 0) == -1)
74 perror_with_name (_("Couldn't get registers"));
75
76 vaxbsd_supply_gregset (regcache, ®s);
77 }
78
79 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
80 this for all registers. */
81
82 static void
vaxbsd_store_inferior_registers(struct target_ops * ops,struct regcache * regcache,int regnum)83 vaxbsd_store_inferior_registers (struct target_ops *ops,
84 struct regcache *regcache, int regnum)
85 {
86 struct reg regs;
87
88 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
89 (PTRACE_TYPE_ARG3) ®s, 0) == -1)
90 perror_with_name (_("Couldn't get registers"));
91
92 vaxbsd_collect_gregset (regcache, ®s, regnum);
93
94 if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
95 (PTRACE_TYPE_ARG3) ®s, 0) == -1)
96 perror_with_name (_("Couldn't write registers"));
97 }
98
99
100 /* Support for debugging kernel virtual memory images. */
101
102 #include <sys/types.h>
103 #include <machine/pcb.h>
104
105 #include "bsd-kvm.h"
106
107 static int
vaxbsd_supply_pcb(struct regcache * regcache,struct pcb * pcb)108 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
109 {
110 int regnum;
111
112 /* The following is true for OpenBSD 3.5:
113
114 The pcb contains the register state at the context switch inside
115 cpu_switch(). */
116
117 /* The stack pointer shouldn't be zero. */
118 if (pcb->KSP == 0)
119 return 0;
120
121 for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
122 regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
123 regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
124 regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
125 regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
126 regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
127 regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
128
129 return 1;
130 }
131
132
133 /* Provide a prototype to silence -Wmissing-prototypes. */
134 void _initialize_vaxbsd_nat (void);
135
136 void
_initialize_vaxbsd_nat(void)137 _initialize_vaxbsd_nat (void)
138 {
139 struct target_ops *t;
140
141 t = inf_ptrace_target ();
142 t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
143 t->to_store_registers = vaxbsd_store_inferior_registers;
144 add_target (t);
145
146 /* Support debugging kernel virtual memory images. */
147 bsd_kvm_add_target (vaxbsd_supply_pcb);
148 }
149