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/tmp/gdb-8.1/gdb/m68k-bsd-nat.c
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1 /* Native-dependent code for Motorola 68000 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 "gdbcore.h"
22 #include "inferior.h"
23 #include "regcache.h"
24
25 #include <sys/types.h>
26 #include <sys/ptrace.h>
27 #include <machine/reg.h>
28
29 #include "m68k-tdep.h"
30 #include "inf-ptrace.h"
31
32 static int
33 m68kbsd_gregset_supplies_p (int regnum)
34 {
35 return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM);
36 }
37
38 static int
39 m68kbsd_fpregset_supplies_p (int regnum)
40 {
41 return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM);
42 }
43
44 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
45
46 static void
47 m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs)
48 {
49 const char *regs = gregs;
50 int regnum;
51
52 for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++)
53 regcache_raw_supply (regcache, regnum, regs + regnum * 4);
54 }
55
56 /* Supply the floating-point registers stored in FPREGS to REGCACHE. */
57
58 static void
59 m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
60 {
61 struct gdbarch *gdbarch = regcache->arch ();
62 const char *regs = fpregs;
63 int regnum;
64
65 for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++)
66 regcache_raw_supply (regcache, regnum,
67 regs + m68kbsd_fpreg_offset (gdbarch, regnum));
68 }
69
70 /* Collect the general-purpose registers from REGCACHE and store them
71 in GREGS. */
72
73 static void
74 m68kbsd_collect_gregset (const struct regcache *regcache,
75 void *gregs, int regnum)
76 {
77 char *regs = gregs;
78 int i;
79
80 for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
81 {
82 if (regnum == -1 || regnum == i)
83 regcache_raw_collect (regcache, i, regs + i * 4);
84 }
85 }
86
87 /* Collect the floating-point registers from REGCACHE and store them
88 in FPREGS. */
89
90 static void
91 m68kbsd_collect_fpregset (struct regcache *regcache,
92 void *fpregs, int regnum)
93 {
94 struct gdbarch *gdbarch = regcache->arch ();
95 char *regs = fpregs;
96 int i;
97
98 for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
99 {
100 if (regnum == -1 || regnum == i)
101 regcache_raw_collect (regcache, i,
102 regs + m68kbsd_fpreg_offset (gdbarch, i));
103 }
104 }
105
106
107 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
108 for all registers (including the floating-point registers). */
109
110 static void
111 m68kbsd_fetch_inferior_registers (struct target_ops *ops,
112 struct regcache *regcache, int regnum)
113 {
114 pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
115
116 if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
117 {
118 struct reg regs;
119
120 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
121 perror_with_name (_("Couldn't get registers"));
122
123 m68kbsd_supply_gregset (regcache, &regs);
124 }
125
126 if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
127 {
128 struct fpreg fpregs;
129
130 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
131 perror_with_name (_("Couldn't get floating point status"));
132
133 m68kbsd_supply_fpregset (regcache, &fpregs);
134 }
135 }
136
137 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
138 this for all registers (including the floating-point registers). */
139
140 static void
141 m68kbsd_store_inferior_registers (struct target_ops *ops,
142 struct regcache *regcache, int regnum)
143 {
144 pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
145
146 if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
147 {
148 struct reg regs;
149
150 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
151 perror_with_name (_("Couldn't get registers"));
152
153 m68kbsd_collect_gregset (regcache, &regs, regnum);
154
155 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
156 perror_with_name (_("Couldn't write registers"));
157 }
158
159 if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
160 {
161 struct fpreg fpregs;
162
163 if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
164 perror_with_name (_("Couldn't get floating point status"));
165
166 m68kbsd_collect_fpregset (regcache, &fpregs, regnum);
167
168 if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
169 perror_with_name (_("Couldn't write floating point status"));
170 }
171 }
172
173
174 /* Support for debugging kernel virtual memory images. */
175
176 #include <machine/pcb.h>
177
178 #include "bsd-kvm.h"
179
180 /* OpenBSD doesn't have these. */
181 #ifndef PCB_REGS_FP
182 #define PCB_REGS_FP 10
183 #endif
184 #ifndef PCB_REGS_SP
185 #define PCB_REGS_SP 11
186 #endif
187
188 static int
189 m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
190 {
191 int regnum, tmp;
192 int i = 0;
193
194 /* The following is true for NetBSD 1.6.2:
195
196 The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for
197 all callee-saved registers. From this information we reconstruct
198 the register state as it would look when we just returned from
199 cpu_switch(). */
200
201 /* The stack pointer shouldn't be zero. */
202 if (pcb->pcb_regs[PCB_REGS_SP] == 0)
203 return 0;
204
205 for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++)
206 regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
207 for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++)
208 regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
209
210 tmp = pcb->pcb_ps & 0xffff;
211 regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp);
212
213 read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp);
214 regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp);
215
216 return 1;
217 }
218
219 void
220 _initialize_m68kbsd_nat (void)
221 {
222 struct target_ops *t;
223
224 t = inf_ptrace_target ();
225 t->to_fetch_registers = m68kbsd_fetch_inferior_registers;
226 t->to_store_registers = m68kbsd_store_inferior_registers;
227 add_target (t);
228
229 /* Support debugging kernel virtual memory images. */
230 bsd_kvm_add_target (m68kbsd_supply_pcb);
231 }
gdbarch
Definition: gdbarch.c:127
add_target
void add_target(struct target_ops *t)
Definition: target.c:395
m68kbsd_gregset_supplies_p
static int m68kbsd_gregset_supplies_p(int regnum)
Definition: m68k-bsd-nat.c:33
M68K_PC_REGNUM
Definition: m68k-tdep.h:39
M68K_D2_REGNUM
Definition: m68k-tdep.h:31
m68kbsd_store_inferior_registers
static void m68kbsd_store_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: m68k-bsd-nat.c:141
m68kbsd_supply_pcb
static int m68kbsd_supply_pcb(struct regcache *regcache, struct pcb *pcb)
Definition: m68k-bsd-nat.c:189
M68K_D0_REGNUM
Definition: m68k-tdep.h:29
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
PCB_REGS_SP
#define PCB_REGS_SP
Definition: m68k-bsd-nat.c:185
regcache_get_ptid
ptid_t regcache_get_ptid(const struct regcache *regcache)
Definition: regcache.c:229
_initialize_m68kbsd_nat
void _initialize_m68kbsd_nat(void)
Definition: m68k-bsd-nat.c:220
m68kbsd_collect_gregset
static void m68kbsd_collect_gregset(const struct regcache *regcache, void *gregs, int regnum)
Definition: m68k-bsd-nat.c:74
M68K_SP_REGNUM
Definition: m68k-tdep.h:37
_
#define _(String)
Definition: gdb_locale.h:35
inf_ptrace_target
struct target_ops * inf_ptrace_target(void)
Definition: inf-ptrace.c:676
defs.h
ptrace
PTRACE_TYPE_RET ptrace()
m68kbsd_fetch_inferior_registers
static void m68kbsd_fetch_inferior_registers(struct target_ops *ops, struct regcache *regcache, int regnum)
Definition: m68k-bsd-nat.c:111
m68kbsd_fpreg_offset
int m68kbsd_fpreg_offset(struct gdbarch *gdbarch, int regnum)
Definition: m68k-bsd-tdep.c:42
m68kbsd_fpregset_supplies_p
static int m68kbsd_fpregset_supplies_p(int regnum)
Definition: m68k-bsd-nat.c:39
M68K_A2_REGNUM
Definition: m68k-tdep.h:35
inf-ptrace.h
target_ops
Definition: target.h:412
regcache.h
bsd-kvm.h
inferior.h
regnum
int regnum
Definition: aarch64-tdep.c:77
read_memory
void read_memory(CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len)
Definition: corefile.c:258
m68kbsd_supply_fpregset
static void m68kbsd_supply_fpregset(struct regcache *regcache, const void *fpregs)
Definition: m68k-bsd-nat.c:59
reg
Definition: regdef.h:22
m68kbsd_collect_fpregset
static void m68kbsd_collect_fpregset(struct regcache *regcache, void *fpregs, int regnum)
Definition: m68k-bsd-nat.c:91
M68K_PS_REGNUM
Definition: m68k-tdep.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
gdbcore.h
regcache::arch
gdbarch * arch() const
Definition: regcache.c:221
M68K_D7_REGNUM
Definition: m68k-tdep.h:32
M68K_FPI_REGNUM
Definition: m68k-tdep.h:43
m68k-tdep.h
m68kbsd_supply_gregset
static void m68kbsd_supply_gregset(struct regcache *regcache, const void *gregs)
Definition: m68k-bsd-nat.c:47
regcache_raw_supply
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1004
PCB_REGS_FP
#define PCB_REGS_FP
Definition: m68k-bsd-nat.c:182
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
target_ops::to_store_registers
void(* to_store_registers)(struct target_ops *, struct regcache *, int) TARGET_DEFAULT_NORETURN(noprocess())
Definition: target.h:459
M68K_FP0_REGNUM
Definition: m68k-tdep.h:40