1 /* Native-dependent code for PowerPC's running FreeBSD, for GDB.
2 Copyright 2002, 2004 Free Software Foundation, Inc.
3 Contributed by Wasabi Systems, 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 <sys/types.h>
23 #include <sys/ptrace.h>
24 #include <machine/reg.h>
25 #include <machine/frame.h>
26
27 #include "defs.h"
28 #include "inferior.h"
29 #include "gdb_assert.h"
30 #include "gdbcore.h"
31 #include "regcache.h"
32
33 #include "ppc-tdep.h"
34 #include "ppcfbsd-tdep.h"
35
36 /* Returns true if PT_GETREGS fetches this register. */
37 static int
getregs_supplies(int regno)38 getregs_supplies (int regno)
39 {
40 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
41
42 return ((regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum)
43 || regno == tdep->ppc_lr_regnum
44 || regno == tdep->ppc_cr_regnum
45 || regno == tdep->ppc_xer_regnum
46 || regno == tdep->ppc_ctr_regnum
47 || regno == PC_REGNUM);
48 }
49
50 /* Like above, but for PT_GETFPREGS. */
51 static int
getfpregs_supplies(int regno)52 getfpregs_supplies (int regno)
53 {
54 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
55
56 /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
57 point registers. Traditionally, GDB's register set has still
58 listed the floating point registers for such machines, so this
59 code is harmless. However, the new E500 port actually omits the
60 floating point registers entirely from the register set --- they
61 don't even have register numbers assigned to them.
62
63 It's not clear to me how best to update this code, so this assert
64 will alert the first person to encounter the NetBSD/E500
65 combination to the problem. */
66 gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
67
68 return ((regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)
69 || regno == tdep->ppc_fpscr_regnum);
70 }
71
72 void
fetch_inferior_registers(int regno)73 fetch_inferior_registers (int regno)
74 {
75 if (regno == -1 || getregs_supplies (regno))
76 {
77 struct reg regs;
78
79 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
80 (PTRACE_ARG3_TYPE) ®s, 0) == -1)
81 perror_with_name (_("Couldn't get registers"));
82
83 ppcfbsd_supply_reg ((char *) ®s, regno);
84 if (regno != -1)
85 return;
86 }
87
88 if (regno == -1 || getfpregs_supplies (regno))
89 {
90 struct fpreg fpregs;
91
92 if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
93 (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
94 perror_with_name (_("Couldn't get FP registers"));
95
96 ppcfbsd_supply_fpreg ((char *) &fpregs, regno);
97 if (regno != -1)
98 return;
99 }
100 }
101
102 void
store_inferior_registers(int regno)103 store_inferior_registers (int regno)
104 {
105 if (regno == -1 || getregs_supplies (regno))
106 {
107 struct reg regs;
108
109 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
110 (PTRACE_ARG3_TYPE) ®s, 0) == -1)
111 perror_with_name (_("Couldn't get registers"));
112
113 ppcfbsd_fill_reg ((char *) ®s, regno);
114
115 if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
116 (PTRACE_ARG3_TYPE) ®s, 0) == -1)
117 perror_with_name (_("Couldn't write registers"));
118
119 if (regno != -1)
120 return;
121 }
122
123 if (regno == -1 || getfpregs_supplies (regno))
124 {
125 struct fpreg fpregs;
126
127 if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
128 (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
129 perror_with_name (_("Couldn't get FP registers"));
130
131 ppcfbsd_fill_fpreg ((char *) &fpregs, regno);
132
133 if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
134 (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
135 perror_with_name (_("Couldn't set FP registers"));
136 }
137 }
138
139 void
fill_gregset(char * regs,int regnum)140 fill_gregset (char *regs, int regnum)
141 {
142 ppcfbsd_fill_reg (regs, regnum);
143 }
144
145 void
supply_gregset(char * regs)146 supply_gregset (char *regs)
147 {
148 ppcfbsd_supply_reg (regs, -1);
149 }
150
151 void
fill_fpregset(char * fpregs,int regnum)152 fill_fpregset (char *fpregs, int regnum)
153 {
154 ppcfbsd_fill_fpreg (fpregs, regnum);
155 }
156
157 void
supply_fpregset(char * fpregs)158 supply_fpregset (char *fpregs)
159 {
160 ppcfbsd_supply_fpreg (fpregs, -1);
161 }
162
163 /* Provide a prototype to silence -Wmissing-prototypes. */
164 void _initialize_ppcfbsd_nat (void);
165
166 void
_initialize_ppcfbsd_nat(void)167 _initialize_ppcfbsd_nat (void)
168 {
169 }
170