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dc18f110 AT |
1 | /* Native-dependent code for PowerPC's running FreeBSD, for GDB. |
2 | ||
1d506c26 | 3 | Copyright (C) 2013-2024 Free Software Foundation, Inc. |
dc18f110 AT |
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 | ||
dc18f110 AT |
20 | #include "gdbcore.h" |
21 | #include "inferior.h" | |
22 | #include "regcache.h" | |
23 | ||
dc18f110 AT |
24 | #include <sys/types.h> |
25 | #include <sys/procfs.h> | |
26 | #include <sys/ptrace.h> | |
27 | #include <sys/signal.h> | |
28 | #include <machine/frame.h> | |
29 | #include <machine/pcb.h> | |
30 | #include <machine/reg.h> | |
31 | ||
32 | #include "fbsd-nat.h" | |
33 | #include "gregset.h" | |
34 | #include "ppc-tdep.h" | |
03b62bbb | 35 | #include "ppc-fbsd-tdep.h" |
dc18f110 AT |
36 | #include "inf-ptrace.h" |
37 | #include "bsd-kvm.h" | |
38 | ||
f6ac5f3d PA |
39 | struct ppc_fbsd_nat_target final : public fbsd_nat_target |
40 | { | |
41 | void fetch_registers (struct regcache *, int) override; | |
42 | void store_registers (struct regcache *, int) override; | |
43 | }; | |
44 | ||
45 | static ppc_fbsd_nat_target the_ppc_fbsd_nat_target; | |
46 | ||
dc18f110 AT |
47 | /* Fill GDB's register array with the general-purpose register values |
48 | in *GREGSETP. */ | |
49 | ||
50 | void | |
51 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) | |
52 | { | |
53 | const struct regset *regset = ppc_fbsd_gregset (sizeof (long)); | |
54 | ||
55 | ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp)); | |
56 | } | |
57 | ||
58 | /* Fill register REGNO (if a gpr) in *GREGSETP with the value in GDB's | |
59 | register array. If REGNO is -1 do it for all registers. */ | |
60 | ||
61 | void | |
62 | fill_gregset (const struct regcache *regcache, | |
63 | gdb_gregset_t *gregsetp, int regno) | |
64 | { | |
65 | const struct regset *regset = ppc_fbsd_gregset (sizeof (long)); | |
66 | ||
67 | if (regno == -1) | |
68 | memset (gregsetp, 0, sizeof (*gregsetp)); | |
69 | ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp)); | |
70 | } | |
71 | ||
72 | /* Fill GDB's register array with the floating-point register values | |
73 | in *FPREGSETP. */ | |
74 | ||
75 | void | |
76 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp) | |
77 | { | |
78 | const struct regset *regset = ppc_fbsd_fpregset (); | |
79 | ||
80 | ppc_supply_fpregset (regset, regcache, -1, | |
81 | fpregsetp, sizeof (*fpregsetp)); | |
82 | } | |
83 | ||
84 | /* Fill register REGNO in *FGREGSETP with the value in GDB's | |
85 | register array. If REGNO is -1 do it for all registers. */ | |
86 | ||
87 | void | |
88 | fill_fpregset (const struct regcache *regcache, | |
89 | gdb_fpregset_t *fpregsetp, int regno) | |
90 | { | |
91 | const struct regset *regset = ppc_fbsd_fpregset (); | |
92 | ||
93 | ppc_collect_fpregset (regset, regcache, regno, | |
94 | fpregsetp, sizeof (*fpregsetp)); | |
95 | } | |
96 | ||
97 | /* Returns true if PT_GETFPREGS fetches this register. */ | |
98 | ||
99 | static int | |
100 | getfpregs_supplies (struct gdbarch *gdbarch, int regno) | |
101 | { | |
08106042 | 102 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
dc18f110 AT |
103 | |
104 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating | |
105 | point registers. Traditionally, GDB's register set has still | |
106 | listed the floating point registers for such machines, so this | |
107 | code is harmless. However, the new E500 port actually omits the | |
108 | floating point registers entirely from the register set --- they | |
109 | don't even have register numbers assigned to them. | |
110 | ||
111 | It's not clear to me how best to update this code, so this assert | |
112 | will alert the first person to encounter the NetBSD/E500 | |
113 | combination to the problem. */ | |
114 | ||
115 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); | |
116 | ||
117 | return ((regno >= tdep->ppc_fp0_regnum | |
118 | && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) | |
119 | || regno == tdep->ppc_fpscr_regnum); | |
120 | } | |
121 | ||
122 | /* Fetch register REGNO from the child process. If REGNO is -1, do it | |
123 | for all registers. */ | |
124 | ||
f6ac5f3d PA |
125 | void |
126 | ppc_fbsd_nat_target::fetch_registers (struct regcache *regcache, int regno) | |
dc18f110 AT |
127 | { |
128 | gdb_gregset_t regs; | |
e38504b3 | 129 | pid_t pid = regcache->ptid ().lwp (); |
dc18f110 | 130 | |
bcc0c096 | 131 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
dc18f110 AT |
132 | perror_with_name (_("Couldn't get registers")); |
133 | ||
134 | supply_gregset (regcache, ®s); | |
135 | ||
ac7936df | 136 | if (regno == -1 || getfpregs_supplies (regcache->arch (), regno)) |
dc18f110 AT |
137 | { |
138 | const struct regset *fpregset = ppc_fbsd_fpregset (); | |
139 | gdb_fpregset_t fpregs; | |
140 | ||
bcc0c096 | 141 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
dc18f110 AT |
142 | perror_with_name (_("Couldn't get FP registers")); |
143 | ||
144 | ppc_supply_fpregset (fpregset, regcache, regno, &fpregs, sizeof fpregs); | |
145 | } | |
146 | } | |
147 | ||
148 | /* Store register REGNO back into the child process. If REGNO is -1, | |
149 | do this for all registers. */ | |
150 | ||
f6ac5f3d PA |
151 | void |
152 | ppc_fbsd_nat_target::store_registers (struct regcache *regcache, int regno) | |
dc18f110 AT |
153 | { |
154 | gdb_gregset_t regs; | |
e38504b3 | 155 | pid_t pid = regcache->ptid ().lwp (); |
dc18f110 | 156 | |
bcc0c096 | 157 | if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
dc18f110 AT |
158 | perror_with_name (_("Couldn't get registers")); |
159 | ||
160 | fill_gregset (regcache, ®s, regno); | |
161 | ||
bcc0c096 | 162 | if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1) |
dc18f110 AT |
163 | perror_with_name (_("Couldn't write registers")); |
164 | ||
ac7936df | 165 | if (regno == -1 || getfpregs_supplies (regcache->arch (), regno)) |
dc18f110 AT |
166 | { |
167 | gdb_fpregset_t fpregs; | |
168 | ||
bcc0c096 | 169 | if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
dc18f110 AT |
170 | perror_with_name (_("Couldn't get FP registers")); |
171 | ||
172 | fill_fpregset (regcache, &fpregs, regno); | |
173 | ||
bcc0c096 | 174 | if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) |
dc18f110 AT |
175 | perror_with_name (_("Couldn't set FP registers")); |
176 | } | |
177 | } | |
178 | ||
179 | /* Architecture specific function that reconstructs the | |
180 | register state from PCB (Process Control Block) and supplies it | |
181 | to REGCACHE. */ | |
182 | ||
183 | static int | |
184 | ppcfbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) | |
185 | { | |
ac7936df | 186 | struct gdbarch *gdbarch = regcache->arch (); |
08106042 | 187 | ppc_gdbarch_tdep *tdep = gdbarch_tdep<ppc_gdbarch_tdep> (gdbarch); |
dc18f110 AT |
188 | int i, regnum; |
189 | ||
190 | /* The stack pointer shouldn't be zero. */ | |
191 | if (pcb->pcb_sp == 0) | |
192 | return 0; | |
193 | ||
73e1c03f SM |
194 | regcache->raw_supply (gdbarch_sp_regnum (gdbarch), &pcb->pcb_sp); |
195 | regcache->raw_supply (tdep->ppc_cr_regnum, &pcb->pcb_cr); | |
196 | regcache->raw_supply (tdep->ppc_lr_regnum, &pcb->pcb_lr); | |
dc18f110 | 197 | for (i = 0, regnum = tdep->ppc_gp0_regnum + 14; i < 20; i++, regnum++) |
73e1c03f | 198 | regcache->raw_supply (regnum, &pcb->pcb_context[i]); |
dc18f110 AT |
199 | |
200 | return 1; | |
201 | } | |
202 | ||
6c265988 | 203 | void _initialize_ppcfbsd_nat (); |
dc18f110 | 204 | void |
6c265988 | 205 | _initialize_ppcfbsd_nat () |
dc18f110 | 206 | { |
d9f719f1 | 207 | add_inf_child_target (&the_ppc_fbsd_nat_target); |
dc18f110 AT |
208 | |
209 | /* Support debugging kernel virtual memory images. */ | |
210 | bsd_kvm_add_target (ppcfbsd_supply_pcb); | |
211 | } |