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/tmp/gdb-8.1/gdb/vax-bsd-nat.c
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1 /* Native-dependent code for modern VAX BSD's.
2
3 Copyright (C) 2004-2018 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 "inferior.h"
22 #include "regcache.h"
23 #include "target.h"
24
25 #include <sys/types.h>
26 #include <sys/ptrace.h>
27 #include <machine/reg.h>
28
29 #include "vax-tdep.h"
30 #include "inf-ptrace.h"
31
32 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
33
34 static void
35 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
36 {
37 const gdb_byte *regs = gregs;
38 int regnum;
39
40 for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
41 regcache_raw_supply (regcache, regnum, regs + regnum * 4);
42 }
43
44 /* Collect the general-purpose registers from REGCACHE and store them
45 in GREGS. */
46
47 static void
48 vaxbsd_collect_gregset (const struct regcache *regcache,
49 void *gregs, int regnum)
50 {
51 gdb_byte *regs = gregs;
52 int i;
53
54 for (i = 0; i <= VAX_NUM_REGS; i++)
55 {
56 if (regnum == -1 || regnum == i)
57 regcache_raw_collect (regcache, i, regs + i * 4);
58 }
59 }
60
61
62 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
63 for all registers. */
64
65 static void
66 vaxbsd_fetch_inferior_registers (struct target_ops *ops,
67 struct regcache *regcache, int regnum)
68 {
69 struct reg regs;
70 pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
71
72 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
73 perror_with_name (_("Couldn't get registers"));
74
75 vaxbsd_supply_gregset (regcache, &regs);
76 }
77
78 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
79 this for all registers. */
80
81 static void
82 vaxbsd_store_inferior_registers (struct target_ops *ops,
83 struct regcache *regcache, int regnum)
84 {
85 struct reg regs;
86 pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
87
88 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
89 perror_with_name (_("Couldn't get registers"));
90
91 vaxbsd_collect_gregset (regcache, &regs, regnum);
92
93 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
94 perror_with_name (_("Couldn't write registers"));
95 }
96
97
98 /* Support for debugging kernel virtual memory images. */
99
100 #include <machine/pcb.h>
101
102 #include "bsd-kvm.h"
103
104 static int
105 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
106 {
107 int regnum;
108
109 /* The following is true for OpenBSD 3.5:
110
111 The pcb contains the register state at the context switch inside
112 cpu_switch(). */
113
114 /* The stack pointer shouldn't be zero. */
115 if (pcb->KSP == 0)
116 return 0;
117
118 for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
119 regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
120 regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
121 regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
122 regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
123 regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
124 regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
125
126 return 1;
127 }
128
129 void
130 _initialize_vaxbsd_nat (void)
131 {
132 struct target_ops *t;
133
134 t = inf_ptrace_target ();
135 t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
136 t->to_store_registers = vaxbsd_store_inferior_registers;
137 add_target (t);
138
139 /* Support debugging kernel virtual memory images. */
140 bsd_kvm_add_target (vaxbsd_supply_pcb);
141 }
add_target
void add_target(struct target_ops *t)
Definition: target.c:395
vaxbsd_collect_gregset
static void vaxbsd_collect_gregset(const struct regcache *regcache, void *gregs, int regnum)
Definition: vax-bsd-nat.c:48
ptid_get_pid
int ptid_get_pid(const ptid_t &ptid)
Definition: ptid.c:47
pid
mach_port_t mach_port_t name mach_port_t mach_port_t name kern_return_t int int rusage_t pid_t pid
Definition: gnu-nat.c:1824
regcache_get_ptid
ptid_t regcache_get_ptid(const struct regcache *regcache)
Definition: regcache.c:229
VAX_SP_REGNUM
Definition: vax-tdep.h:31
_
#define _(String)
Definition: gdb_locale.h:35
inf_ptrace_target
struct target_ops * inf_ptrace_target(void)
Definition: inf-ptrace.c:676
defs.h
VAX_R0_REGNUM
Definition: vax-tdep.h:27
ptrace
PTRACE_TYPE_RET ptrace()
VAX_NUM_REGS
#define VAX_NUM_REGS
Definition: vax-tdep.h:37
VAX_FP_REGNUM
Definition: vax-tdep.h:30
VAX_PC_REGNUM
Definition: vax-tdep.h:32
inf-ptrace.h
target_ops
Definition: target.h:412
vax-tdep.h
regcache.h
bsd-kvm.h
inferior.h
VAX_PS_REGNUM
Definition: vax-tdep.h:33
vaxbsd_fetch_inferior_registers
static void vaxbsd_fetch_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: vax-bsd-nat.c:66
regnum
int regnum
Definition: aarch64-tdep.c:77
reg
Definition: regdef.h:22
gdb_byte
bfd_byte gdb_byte
Definition: common-types.h:38
target_ops::to_fetch_registers
void(* to_fetch_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_IGNORE()
Definition: target.h:457
perror_with_name
void void void void void void void void void perror_with_name(const char *string) ATTRIBUTE_NORETURN
Definition: utils.c:692
vaxbsd_supply_gregset
static void vaxbsd_supply_gregset(struct regcache *regcache, const void *gregs)
Definition: vax-bsd-nat.c:35
target.h
_initialize_vaxbsd_nat
void _initialize_vaxbsd_nat(void)
Definition: vax-bsd-nat.c:130
vaxbsd_store_inferior_registers
static void vaxbsd_store_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: vax-bsd-nat.c:82
regcache_raw_supply
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1004
regcache
Definition: regcache.h:232
regcache_raw_collect
void regcache_raw_collect(const struct regcache *regcache, int regnum, void *buf)
Definition: regcache.c:1085
PTRACE_TYPE_ARG3
#define PTRACE_TYPE_ARG3
Definition: config.h:642
bsd_kvm_add_target
void bsd_kvm_add_target(int(*supply_pcb)(struct regcache *, struct pcb *))
Definition: bsd-kvm.c:354
VAX_AP_REGNUM
Definition: vax-tdep.h:29
target_ops::to_store_registers
void(* to_store_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:459
vaxbsd_supply_pcb
static int vaxbsd_supply_pcb(struct regcache *regcache, struct pcb *pcb)
Definition: vax-bsd-nat.c:105