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1 | /* Native-dependent code for Motorola 68000 BSD's. | |
2 | ||
3 | Copyright (C) 2004-2023 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 "gdbcore.h" | |
24 | #include "inferior.h" | |
25 | #include "regcache.h" | |
26 | ||
27 | #include <sys/types.h> | |
28 | #include <sys/ptrace.h> | |
29 | #include <machine/reg.h> | |
30 | ||
31 | #include "m68k-tdep.h" | |
32 | #include "inf-ptrace.h" | |
33 | #include "netbsd-nat.h" | |
34 | ||
35 | struct m68k_bsd_nat_target final : public nbsd_nat_target | |
36 | { | |
37 | void fetch_registers (struct regcache *, int) override; | |
38 | void store_registers (struct regcache *, int) override; | |
39 | }; | |
40 | ||
41 | static m68k_bsd_nat_target the_m68k_bsd_nat_target; | |
42 | ||
43 | static int | |
44 | m68kbsd_gregset_supplies_p (int regnum) | |
45 | { | |
46 | return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); | |
47 | } | |
48 | ||
49 | static int | |
50 | m68kbsd_fpregset_supplies_p (int regnum) | |
51 | { | |
52 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); | |
53 | } | |
54 | ||
55 | /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ | |
56 | ||
57 | static void | |
58 | m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) | |
59 | { | |
60 | const gdb_byte *regs = (const gdb_byte *) gregs; | |
61 | int regnum; | |
62 | ||
63 | for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) | |
64 | regcache->raw_supply (regnum, regs + regnum * 4); | |
65 | } | |
66 | ||
67 | /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ | |
68 | ||
69 | static void | |
70 | m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) | |
71 | { | |
72 | struct gdbarch *gdbarch = regcache->arch (); | |
73 | const gdb_byte *regs = (const gdb_byte *) fpregs; | |
74 | int regnum; | |
75 | ||
76 | for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) | |
77 | regcache->raw_supply (regnum, | |
78 | regs + m68kbsd_fpreg_offset (gdbarch, regnum)); | |
79 | } | |
80 | ||
81 | /* Collect the general-purpose registers from REGCACHE and store them | |
82 | in GREGS. */ | |
83 | ||
84 | static void | |
85 | m68kbsd_collect_gregset (const struct regcache *regcache, | |
86 | void *gregs, int regnum) | |
87 | { | |
88 | gdb_byte *regs = (gdb_byte *) gregs; | |
89 | int i; | |
90 | ||
91 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
92 | { | |
93 | if (regnum == -1 || regnum == i) | |
94 | regcache->raw_collect (i, regs + i * 4); | |
95 | } | |
96 | } | |
97 | ||
98 | /* Collect the floating-point registers from REGCACHE and store them | |
99 | in FPREGS. */ | |
100 | ||
101 | static void | |
102 | m68kbsd_collect_fpregset (struct regcache *regcache, | |
103 | void *fpregs, int regnum) | |
104 | { | |
105 | struct gdbarch *gdbarch = regcache->arch (); | |
106 | char *regs = fpregs; | |
107 | int i; | |
108 | ||
109 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
110 | { | |
111 | if (regnum == -1 || regnum == i) | |
112 | regcache->raw_collect (i, regs + m68kbsd_fpreg_offset (gdbarch, i)); | |
113 | } | |
114 | } | |
115 | \f | |
116 | ||
117 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
118 | for all registers (including the floating-point registers). */ | |
119 | ||
120 | void | |
121 | m68k_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) | |
122 | { | |
123 | pid_t pid = regcache->ptid ().pid (); | |
124 | int lwp = regcache->ptid ().lwp (); | |
125 | ||
126 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) | |
127 | { | |
128 | struct reg regs; | |
129 | ||
130 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) | |
131 | perror_with_name (_("Couldn't get registers")); | |
132 | ||
133 | m68kbsd_supply_gregset (regcache, ®s); | |
134 | } | |
135 | ||
136 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
137 | { | |
138 | struct fpreg fpregs; | |
139 | ||
140 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) | |
141 | perror_with_name (_("Couldn't get floating point status")); | |
142 | ||
143 | m68kbsd_supply_fpregset (regcache, &fpregs); | |
144 | } | |
145 | } | |
146 | ||
147 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
148 | this for all registers (including the floating-point registers). */ | |
149 | ||
150 | void | |
151 | m68k_bsd_nat_target::store_registers (struct regcache *regcache, int regnum) | |
152 | { | |
153 | pid_t pid = regcache->ptid ().pid (); | |
154 | int lwp = regcache->ptid ().lwp (); | |
155 | ||
156 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) | |
157 | { | |
158 | struct reg regs; | |
159 | ||
160 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) | |
161 | perror_with_name (_("Couldn't get registers")); | |
162 | ||
163 | m68kbsd_collect_gregset (regcache, ®s, regnum); | |
164 | ||
165 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) | |
166 | perror_with_name (_("Couldn't write registers")); | |
167 | } | |
168 | ||
169 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
170 | { | |
171 | struct fpreg fpregs; | |
172 | ||
173 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) | |
174 | perror_with_name (_("Couldn't get floating point status")); | |
175 | ||
176 | m68kbsd_collect_fpregset (regcache, &fpregs, regnum); | |
177 | ||
178 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) | |
179 | perror_with_name (_("Couldn't write floating point status")); | |
180 | } | |
181 | } | |
182 | \f | |
183 | ||
184 | /* Support for debugging kernel virtual memory images. */ | |
185 | ||
186 | #include <machine/pcb.h> | |
187 | ||
188 | #include "bsd-kvm.h" | |
189 | ||
190 | /* OpenBSD doesn't have these. */ | |
191 | #ifndef PCB_REGS_FP | |
192 | #define PCB_REGS_FP 10 | |
193 | #endif | |
194 | #ifndef PCB_REGS_SP | |
195 | #define PCB_REGS_SP 11 | |
196 | #endif | |
197 | ||
198 | static int | |
199 | m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
200 | { | |
201 | int regnum, tmp; | |
202 | int i = 0; | |
203 | ||
204 | /* The following is true for NetBSD 1.6.2: | |
205 | ||
206 | The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for | |
207 | all callee-saved registers. From this information we reconstruct | |
208 | the register state as it would look when we just returned from | |
209 | cpu_switch(). */ | |
210 | ||
211 | /* The stack pointer shouldn't be zero. */ | |
212 | if (pcb->pcb_regs[PCB_REGS_SP] == 0) | |
213 | return 0; | |
214 | ||
215 | for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) | |
216 | regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); | |
217 | for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) | |
218 | regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); | |
219 | ||
220 | tmp = pcb->pcb_ps & 0xffff; | |
221 | regcache->raw_supply (M68K_PS_REGNUM, &tmp); | |
222 | ||
223 | read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (gdb_byte *) &tmp, sizeof tmp); | |
224 | regcache->raw_supply (M68K_PC_REGNUM, &tmp); | |
225 | ||
226 | return 1; | |
227 | } | |
228 | ||
229 | void _initialize_m68kbsd_nat (); | |
230 | void | |
231 | _initialize_m68kbsd_nat () | |
232 | { | |
233 | add_inf_child_target (&the_m68k_bsd_nat_target); | |
234 | ||
235 | /* Support debugging kernel virtual memory images. */ | |
236 | bsd_kvm_add_target (m68kbsd_supply_pcb); | |
237 | } |