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8f2d3ea0 MK |
1 | /* Native-dependent code for Motorola 68000 BSD's. |
2 | ||
e2882c85 | 3 | Copyright (C) 2004-2018 Free Software Foundation, Inc. |
8f2d3ea0 MK |
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 |
8f2d3ea0 MK |
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 | ||
8f2d3ea0 MK |
25 | #include <sys/types.h> |
26 | #include <sys/ptrace.h> | |
27 | #include <machine/reg.h> | |
28 | ||
29 | #include "m68k-tdep.h" | |
bcfca652 | 30 | #include "inf-ptrace.h" |
8f2d3ea0 | 31 | |
f6ac5f3d PA |
32 | struct m68k_bsd_nat_target final : public inf_ptrace_target |
33 | { | |
34 | void fetch_registers (struct regcache *, int) override; | |
35 | void store_registers (struct regcache *, int) override; | |
36 | }; | |
37 | ||
38 | static m68k_bsd_nat_target the_m68k_bsd_nat_target; | |
39 | ||
8f2d3ea0 MK |
40 | static int |
41 | m68kbsd_gregset_supplies_p (int regnum) | |
42 | { | |
43 | return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); | |
44 | } | |
45 | ||
46 | static int | |
47 | m68kbsd_fpregset_supplies_p (int regnum) | |
48 | { | |
49 | return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); | |
50 | } | |
51 | ||
52 | /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ | |
53 | ||
54 | static void | |
55 | m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) | |
56 | { | |
57 | const char *regs = gregs; | |
58 | int regnum; | |
59 | ||
60 | for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) | |
73e1c03f | 61 | regcache->raw_supply (regnum, regs + regnum * 4); |
8f2d3ea0 MK |
62 | } |
63 | ||
64 | /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ | |
65 | ||
66 | static void | |
67 | m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) | |
68 | { | |
ac7936df | 69 | struct gdbarch *gdbarch = regcache->arch (); |
8f2d3ea0 MK |
70 | const char *regs = fpregs; |
71 | int regnum; | |
72 | ||
73 | for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) | |
73e1c03f SM |
74 | regcache->raw_supply (regnum, |
75 | regs + m68kbsd_fpreg_offset (gdbarch, regnum)); | |
8f2d3ea0 MK |
76 | } |
77 | ||
78 | /* Collect the general-purpose registers from REGCACHE and store them | |
79 | in GREGS. */ | |
80 | ||
81 | static void | |
82 | m68kbsd_collect_gregset (const struct regcache *regcache, | |
83 | void *gregs, int regnum) | |
84 | { | |
85 | char *regs = gregs; | |
86 | int i; | |
87 | ||
88 | for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) | |
89 | { | |
90 | if (regnum == -1 || regnum == i) | |
34a79281 | 91 | regcache->raw_collect (i, regs + i * 4); |
8f2d3ea0 MK |
92 | } |
93 | } | |
94 | ||
95 | /* Collect the floating-point registers from REGCACHE and store them | |
96 | in FPREGS. */ | |
97 | ||
98 | static void | |
99 | m68kbsd_collect_fpregset (struct regcache *regcache, | |
100 | void *fpregs, int regnum) | |
101 | { | |
ac7936df | 102 | struct gdbarch *gdbarch = regcache->arch (); |
8f2d3ea0 MK |
103 | char *regs = fpregs; |
104 | int i; | |
105 | ||
106 | for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) | |
107 | { | |
108 | if (regnum == -1 || regnum == i) | |
34a79281 | 109 | regcache->raw_collect (i, regs + m68kbsd_fpreg_offset (gdbarch, i)); |
8f2d3ea0 MK |
110 | } |
111 | } | |
112 | \f | |
113 | ||
114 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this | |
115 | for all registers (including the floating-point registers). */ | |
116 | ||
f6ac5f3d PA |
117 | void |
118 | m68k_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) | |
8f2d3ea0 | 119 | { |
e99b03dc | 120 | pid_t pid = regcache->ptid ().pid (); |
bcc0c096 | 121 | |
8f2d3ea0 MK |
122 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
123 | { | |
124 | struct reg regs; | |
125 | ||
bcc0c096 | 126 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 127 | perror_with_name (_("Couldn't get registers")); |
8f2d3ea0 | 128 | |
56be3814 | 129 | m68kbsd_supply_gregset (regcache, ®s); |
8f2d3ea0 MK |
130 | } |
131 | ||
132 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
133 | { | |
134 | struct fpreg fpregs; | |
135 | ||
bcc0c096 | 136 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 137 | perror_with_name (_("Couldn't get floating point status")); |
8f2d3ea0 | 138 | |
56be3814 | 139 | m68kbsd_supply_fpregset (regcache, &fpregs); |
8f2d3ea0 MK |
140 | } |
141 | } | |
142 | ||
143 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do | |
144 | this for all registers (including the floating-point registers). */ | |
145 | ||
f6ac5f3d PA |
146 | void |
147 | m68k_bsd_nat_target::store_registers (struct regcache *regcache, int regnum) | |
8f2d3ea0 | 148 | { |
e99b03dc | 149 | pid_t pid = regcache->ptid ().pid (); |
bcc0c096 | 150 | |
8f2d3ea0 MK |
151 | if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
152 | { | |
153 | struct reg regs; | |
154 | ||
bcc0c096 | 155 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 156 | perror_with_name (_("Couldn't get registers")); |
8f2d3ea0 | 157 | |
56be3814 | 158 | m68kbsd_collect_gregset (regcache, ®s, regnum); |
8f2d3ea0 | 159 | |
bcc0c096 | 160 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
e2e0b3e5 | 161 | perror_with_name (_("Couldn't write registers")); |
8f2d3ea0 MK |
162 | } |
163 | ||
164 | if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) | |
165 | { | |
166 | struct fpreg fpregs; | |
167 | ||
bcc0c096 | 168 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 169 | perror_with_name (_("Couldn't get floating point status")); |
8f2d3ea0 | 170 | |
56be3814 | 171 | m68kbsd_collect_fpregset (regcache, &fpregs, regnum); |
8f2d3ea0 | 172 | |
bcc0c096 | 173 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
e2e0b3e5 | 174 | perror_with_name (_("Couldn't write floating point status")); |
8f2d3ea0 MK |
175 | } |
176 | } | |
cb162ff6 MK |
177 | \f |
178 | ||
179 | /* Support for debugging kernel virtual memory images. */ | |
180 | ||
cb162ff6 MK |
181 | #include <machine/pcb.h> |
182 | ||
183 | #include "bsd-kvm.h" | |
184 | ||
185 | /* OpenBSD doesn't have these. */ | |
186 | #ifndef PCB_REGS_FP | |
187 | #define PCB_REGS_FP 10 | |
188 | #endif | |
189 | #ifndef PCB_REGS_SP | |
190 | #define PCB_REGS_SP 11 | |
191 | #endif | |
192 | ||
193 | static int | |
194 | m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
195 | { | |
196 | int regnum, tmp; | |
197 | int i = 0; | |
198 | ||
199 | /* The following is true for NetBSD 1.6.2: | |
200 | ||
201 | The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for | |
202 | all callee-saved registers. From this information we reconstruct | |
203 | the register state as it would look when we just returned from | |
204 | cpu_switch(). */ | |
205 | ||
206 | /* The stack pointer shouldn't be zero. */ | |
207 | if (pcb->pcb_regs[PCB_REGS_SP] == 0) | |
208 | return 0; | |
209 | ||
210 | for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) | |
73e1c03f | 211 | regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); |
cb162ff6 | 212 | for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) |
73e1c03f | 213 | regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); |
cb162ff6 MK |
214 | |
215 | tmp = pcb->pcb_ps & 0xffff; | |
73e1c03f | 216 | regcache->raw_supply (M68K_PS_REGNUM, &tmp); |
cb162ff6 MK |
217 | |
218 | read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp); | |
73e1c03f | 219 | regcache->raw_supply (M68K_PC_REGNUM, &tmp); |
cb162ff6 MK |
220 | |
221 | return 1; | |
222 | } | |
cb162ff6 MK |
223 | |
224 | void | |
225 | _initialize_m68kbsd_nat (void) | |
226 | { | |
d9f719f1 | 227 | add_inf_child_target (&the_m68k_bsd_nat_target); |
abbc6945 | 228 | |
cb162ff6 MK |
229 | /* Support debugging kernel virtual memory images. */ |
230 | bsd_kvm_add_target (m68kbsd_supply_pcb); | |
231 | } |