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alpha-bsd-nat.c
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1/* Native-dependent code for Alpha BSD's.
2
3 Copyright (C) 2000-2023 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/* We define this to get types like register_t. */
21#define _KERNTYPES
22#include "defs.h"
23#include "inferior.h"
24#include "regcache.h"
25
26#include "alpha-tdep.h"
27#include "alpha-bsd-tdep.h"
28#include "inf-ptrace.h"
29#include "netbsd-nat.h"
30
31#include <sys/types.h>
32#include <sys/ptrace.h>
33#include <machine/reg.h>
34
36{
37 void fetch_registers (struct regcache *, int) override;
38 void store_registers (struct regcache *, int) override;
39};
40
42
43/* Determine if PT_GETREGS fetches this register. */
44
45static int
47{
48 return ((regno >= ALPHA_V0_REGNUM && regno <= ALPHA_ZERO_REGNUM)
49 || regno >= ALPHA_PC_REGNUM);
50}
51
52/* Fetch register REGNO from the inferior. If REGNO is -1, do this
53 for all registers (including the floating point registers). */
54
55void
57{
58 int lwp = regcache->ptid ().lwp ();
59
60 if (regno == -1 || getregs_supplies (regno))
61 {
62 struct reg gregs;
63
64 if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
65 (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
66 perror_with_name (_("Couldn't get registers"));
67
68 alphabsd_supply_reg (regcache, (char *) &gregs, regno);
69 if (regno != -1)
70 return;
71 }
72
73 if (regno == -1
74 || regno >= gdbarch_fp0_regnum (regcache->arch ()))
75 {
76 struct fpreg fpregs;
77
78 if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
79 (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
80 perror_with_name (_("Couldn't get floating point status"));
81
82 alphabsd_supply_fpreg (regcache, (char *) &fpregs, regno);
83 }
84}
85
86/* Store register REGNO back into the inferior. If REGNO is -1, do
87 this for all registers (including the floating point registers). */
88
89void
91{
92 int lwp = regcache->ptid ().lwp ();
93
94 if (regno == -1 || getregs_supplies (regno))
95 {
96 struct reg gregs;
97 if (ptrace (PT_GETREGS, regcache->ptid ().pid (),
98 (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
99 perror_with_name (_("Couldn't get registers"));
100
101 alphabsd_fill_reg (regcache, (char *) &gregs, regno);
102
103 if (ptrace (PT_SETREGS, regcache->ptid ().pid (),
104 (PTRACE_TYPE_ARG3) &gregs, lwp) == -1)
105 perror_with_name (_("Couldn't write registers"));
106
107 if (regno != -1)
108 return;
109 }
110
111 if (regno == -1
112 || regno >= gdbarch_fp0_regnum (regcache->arch ()))
113 {
114 struct fpreg fpregs;
115
116 if (ptrace (PT_GETFPREGS, regcache->ptid ().pid (),
117 (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
118 perror_with_name (_("Couldn't get floating point status"));
119
120 alphabsd_fill_fpreg (regcache, (char *) &fpregs, regno);
121
122 if (ptrace (PT_SETFPREGS, regcache->ptid ().pid (),
123 (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1)
124 perror_with_name (_("Couldn't write floating point status"));
125 }
126}
127
128
129/* Support for debugging kernel virtual memory images. */
130
131#include <sys/signal.h>
132#include <machine/pcb.h>
133
134#include "bsd-kvm.h"
135
136static int
137alphabsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
138{
139 int regnum;
140
141 /* The following is true for OpenBSD 3.9:
142
143 The pcb contains the register state at the context switch inside
144 cpu_switch(). */
145
146 /* The stack pointer shouldn't be zero. */
147 if (pcb->pcb_hw.apcb_ksp == 0)
148 return 0;
149
150 regcache->raw_supply (ALPHA_SP_REGNUM, &pcb->pcb_hw.apcb_ksp);
151
153 regcache->raw_supply (regnum, &pcb->pcb_context[regnum - ALPHA_S0_REGNUM]);
154 regcache->raw_supply (ALPHA_RA_REGNUM, &pcb->pcb_context[7]);
155
156 return 1;
157}
158
159
161void
163{
165
166 /* Support debugging kernel virtual memory images. */
168}
int regnum
void _initialize_alphabsd_nat()
static alpha_bsd_nat_target the_alpha_bsd_nat_target
static int getregs_supplies(int regno)
static int alphabsd_supply_pcb(struct regcache *regcache, struct pcb *pcb)
void alphabsd_fill_reg(const struct regcache *regcache, char *regs, int regno)
void alphabsd_supply_fpreg(struct regcache *regcache, const char *fpregs, int regno)
void alphabsd_fill_fpreg(const struct regcache *regcache, char *fpregs, int regno)
void alphabsd_supply_reg(struct regcache *regcache, const char *regs, int regno)
#define ALPHA_S0_REGNUM
Definition alpha-tdep.h:40
#define ALPHA_PC_REGNUM
Definition alpha-tdep.h:52
#define ALPHA_SP_REGNUM
Definition alpha-tdep.h:47
#define ALPHA_A0_REGNUM
Definition alpha-tdep.h:42
#define ALPHA_V0_REGNUM
Definition alpha-tdep.h:38
#define ALPHA_RA_REGNUM
Definition alpha-tdep.h:44
#define ALPHA_ZERO_REGNUM
Definition alpha-tdep.h:48
void bsd_kvm_add_target(int(*supply_pcb)(struct regcache *, struct pcb *))
Definition bsd-kvm.c:380
gdbarch * arch() const
Definition regcache.c:231
void raw_supply(int regnum, const void *buf) override
Definition regcache.c:1062
ptid_t ptid() const
Definition regcache.h:408
#define ptrace(request, pid, addr, data)
Definition gdb_ptrace.h:141
int gdbarch_fp0_regnum(struct gdbarch *gdbarch)
Definition gdbarch.c:2088
void add_inf_child_target(inf_child_target *target)
Definition inf-child.c:418
#define PTRACE_TYPE_ARG3
void store_registers(struct regcache *, int) override
void fetch_registers(struct regcache *, int) override