1 /* Native-dependent code for OpenBSD/mips64.
2
3 Copyright 2004 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 #include "defs.h"
23 #include "inferior.h"
24 #include "regcache.h"
25 #include "target.h"
26
27 #include <sys/types.h>
28 #include <sys/ptrace.h>
29 #include <machine/reg.h>
30
31 #include "mips-tdep.h"
32 #include "inf-ptrace.h"
33 #include "obsd-nat.h"
34
35 /* Shorthand for some register numbers used below. */
36 #define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM
37 #define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
38 #define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
39
40 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
41
42 static void
mips64obsd_supply_gregset(struct regcache * regcache,const void * gregs)43 mips64obsd_supply_gregset (struct regcache *regcache, const void *gregs)
44 {
45 const char *regs = gregs;
46 int regnum;
47
48 for (regnum = MIPS_ZERO_REGNUM; regnum <= MIPS_PC_REGNUM; regnum++)
49 regcache_raw_supply (regcache, regnum, regs + regnum * 8);
50
51 for (regnum = MIPS_FP0_REGNUM; regnum <= MIPS_FSR_REGNUM; regnum++)
52 regcache_raw_supply (regcache, regnum, regs + (regnum + 2) * 8);
53 }
54
55 /* Collect the general-purpose registers from REGCACHE and store them
56 in GREGS. */
57
58 static void
mips64obsd_collect_gregset(const struct regcache * regcache,void * gregs,int regnum)59 mips64obsd_collect_gregset (const struct regcache *regcache,
60 void *gregs, int regnum)
61 {
62 char *regs = gregs;
63 int i;
64
65 for (i = MIPS_ZERO_REGNUM; i <= MIPS_PC_REGNUM; i++)
66 {
67 if (regnum == -1 || regnum == i)
68 regcache_raw_collect (regcache, i, regs + i * 8);
69 }
70
71 for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
72 {
73 if (regnum == -1 || regnum == i)
74 regcache_raw_collect (regcache, i, regs + (i + 2) * 8);
75 }
76 }
77
78
79 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
80 for all registers. */
81
82 static void
mips64obsd_fetch_inferior_registers(int regnum)83 mips64obsd_fetch_inferior_registers (int regnum)
84 {
85 struct reg regs;
86 int pid;
87
88 /* Cater for systems like OpenBSD, that implement threads as
89 separate processes. */
90 pid = ptid_get_lwp (inferior_ptid);
91 if (pid == 0)
92 pid = ptid_get_pid (inferior_ptid);
93
94 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
95 perror_with_name ("Couldn't get registers");
96
97 mips64obsd_supply_gregset (current_regcache, ®s);
98 }
99
100 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
101 this for all registers. */
102
103 static void
mips64obsd_store_inferior_registers(int regnum)104 mips64obsd_store_inferior_registers (int regnum)
105 {
106 struct reg regs;
107 int pid;
108
109 /* Cater for systems like OpenBSD, that implement threads as
110 separate processes. */
111 pid = ptid_get_lwp (inferior_ptid);
112 if (pid == 0)
113 pid = ptid_get_pid (inferior_ptid);
114
115 if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
116 perror_with_name ("Couldn't get registers");
117
118 mips64obsd_collect_gregset (current_regcache, ®s, regnum);
119
120 if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
121 perror_with_name ("Couldn't write registers");
122 }
123
124
125 /* Provide a prototype to silence -Wmissing-prototypes. */
126 void _initialize_mips64obsd_nat (void);
127
128 void
_initialize_mips64obsd_nat(void)129 _initialize_mips64obsd_nat (void)
130 {
131 struct target_ops *t;
132
133 t = inf_ptrace_target ();
134 t->to_fetch_registers = mips64obsd_fetch_inferior_registers;
135 t->to_store_registers = mips64obsd_store_inferior_registers;
136 t->to_pid_to_str = obsd_pid_to_str;
137 t->to_find_new_threads = obsd_find_new_threads;
138 add_target (t);
139 }
140