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1 | /* Native-dependent code for Motorola 68000 BSD's. |
2 | ||
9b254dd1 | 3 | Copyright (C) 2004, 2007, 2008 Free Software Foundation, Inc. |
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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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
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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 | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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19 | |
20 | #include "defs.h" | |
cb162ff6 | 21 | #include "gdbcore.h" |
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22 | #include "inferior.h" |
23 | #include "regcache.h" | |
24 | ||
25 | #include "gdb_assert.h" | |
26 | #include <sys/types.h> | |
27 | #include <sys/ptrace.h> | |
28 | #include <machine/reg.h> | |
29 | ||
30 | #include "m68k-tdep.h" | |
bcfca652 | 31 | #include "inf-ptrace.h" |
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32 | |
33 | static int | |
34 | m68kbsd_gregset_supplies_p (int regnum) | |
35 | { | |
36 | return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); | |
37 | } | |
38 | ||
39 | static int | |
40 | m68kbsd_fpregset_supplies_p (int regnum) | |
41 | { | |
42 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); | |
43 | } | |
44 | ||
45 | /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ | |
46 | ||
47 | static void | |
48 | m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) | |
49 | { | |
50 | const char *regs = gregs; | |
51 | int regnum; | |
52 | ||
53 | for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) | |
54 | regcache_raw_supply (regcache, regnum, regs + regnum * 4); | |
55 | } | |
56 | ||
57 | /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ | |
58 | ||
59 | static void | |
60 | m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) | |
61 | { | |
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 (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) | |
5df97fde | 83 | regcache_raw_collect (regcache, i, regs + i * 4); |
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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 | char *regs = fpregs; | |
95 | int i; | |
96 | ||
97 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
98 | { | |
99 | if (regnum == -1 || regnum == i) | |
5df97fde | 100 | regcache_raw_collect (regcache, i, regs + m68kbsd_fpreg_offset (i)); |
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101 | } |
102 | } | |
103 | \f | |
104 | ||
105 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
106 | for all registers (including the floating-point registers). */ | |
107 | ||
abbc6945 | 108 | static void |
56be3814 | 109 | m68kbsd_fetch_inferior_registers (struct regcache *regcache, int regnum) |
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110 | { |
111 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) | |
112 | { | |
113 | struct reg regs; | |
114 | ||
115 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 116 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 117 | perror_with_name (_("Couldn't get registers")); |
8f2d3ea0 | 118 | |
56be3814 | 119 | m68kbsd_supply_gregset (regcache, ®s); |
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120 | } |
121 | ||
122 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
123 | { | |
124 | struct fpreg fpregs; | |
125 | ||
126 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 127 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 128 | perror_with_name (_("Couldn't get floating point status")); |
8f2d3ea0 | 129 | |
56be3814 | 130 | m68kbsd_supply_fpregset (regcache, &fpregs); |
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131 | } |
132 | } | |
133 | ||
134 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
135 | this for all registers (including the floating-point registers). */ | |
136 | ||
abbc6945 | 137 | static void |
56be3814 | 138 | m68kbsd_store_inferior_registers (struct regcache *regcache, int regnum) |
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139 | { |
140 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) | |
141 | { | |
142 | struct reg regs; | |
143 | ||
144 | if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 145 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 146 | perror_with_name (_("Couldn't get registers")); |
8f2d3ea0 | 147 | |
56be3814 | 148 | m68kbsd_collect_gregset (regcache, ®s, regnum); |
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149 | |
150 | if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 151 | (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 152 | perror_with_name (_("Couldn't write registers")); |
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153 | } |
154 | ||
155 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
156 | { | |
157 | struct fpreg fpregs; | |
158 | ||
159 | if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 160 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 161 | perror_with_name (_("Couldn't get floating point status")); |
8f2d3ea0 | 162 | |
56be3814 | 163 | m68kbsd_collect_fpregset (regcache, &fpregs, regnum); |
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164 | |
165 | if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), | |
9f8e0089 | 166 | (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 167 | perror_with_name (_("Couldn't write floating point status")); |
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168 | } |
169 | } | |
cb162ff6 MK |
170 | \f |
171 | ||
172 | /* Support for debugging kernel virtual memory images. */ | |
173 | ||
174 | #include <sys/types.h> | |
175 | #include <machine/pcb.h> | |
176 | ||
177 | #include "bsd-kvm.h" | |
178 | ||
179 | /* OpenBSD doesn't have these. */ | |
180 | #ifndef PCB_REGS_FP | |
181 | #define PCB_REGS_FP 10 | |
182 | #endif | |
183 | #ifndef PCB_REGS_SP | |
184 | #define PCB_REGS_SP 11 | |
185 | #endif | |
186 | ||
187 | static int | |
188 | m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
189 | { | |
190 | int regnum, tmp; | |
191 | int i = 0; | |
192 | ||
193 | /* The following is true for NetBSD 1.6.2: | |
194 | ||
195 | The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for | |
196 | all callee-saved registers. From this information we reconstruct | |
197 | the register state as it would look when we just returned from | |
198 | cpu_switch(). */ | |
199 | ||
200 | /* The stack pointer shouldn't be zero. */ | |
201 | if (pcb->pcb_regs[PCB_REGS_SP] == 0) | |
202 | return 0; | |
203 | ||
204 | for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) | |
205 | regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); | |
206 | for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) | |
207 | regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); | |
208 | ||
209 | tmp = pcb->pcb_ps & 0xffff; | |
210 | regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp); | |
211 | ||
212 | read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp); | |
213 | regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp); | |
214 | ||
215 | return 1; | |
216 | } | |
217 | \f | |
218 | ||
219 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
220 | void _initialize_m68kbsd_nat (void); | |
221 | ||
222 | void | |
223 | _initialize_m68kbsd_nat (void) | |
224 | { | |
abbc6945 MK |
225 | struct target_ops *t; |
226 | ||
227 | t = inf_ptrace_target (); | |
bcfca652 MK |
228 | t->to_fetch_registers = m68kbsd_fetch_inferior_registers; |
229 | t->to_store_registers = m68kbsd_store_inferior_registers; | |
abbc6945 MK |
230 | add_target (t); |
231 | ||
cb162ff6 MK |
232 | /* Support debugging kernel virtual memory images. */ |
233 | bsd_kvm_add_target (m68kbsd_supply_pcb); | |
234 | } |