1 /* Native-dependent code for PowerPC's running FreeBSD, for GDB.
3 Copyright (C) 2013-2021 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
25 #include <sys/types.h>
26 #include <sys/procfs.h>
27 #include <sys/ptrace.h>
28 #include <sys/signal.h>
29 #include <machine/frame.h>
30 #include <machine/pcb.h>
31 #include <machine/reg.h>
36 #include "ppc-fbsd-tdep.h"
37 #include "inf-ptrace.h"
40 struct ppc_fbsd_nat_target final
: public fbsd_nat_target
42 void fetch_registers (struct regcache
*, int) override
;
43 void store_registers (struct regcache
*, int) override
;
46 static ppc_fbsd_nat_target the_ppc_fbsd_nat_target
;
48 /* Fill GDB's register array with the general-purpose register values
52 supply_gregset (struct regcache
*regcache
, const gdb_gregset_t
*gregsetp
)
54 const struct regset
*regset
= ppc_fbsd_gregset (sizeof (long));
56 ppc_supply_gregset (regset
, regcache
, -1, gregsetp
, sizeof (*gregsetp
));
59 /* Fill register REGNO (if a gpr) in *GREGSETP with the value in GDB's
60 register array. If REGNO is -1 do it for all registers. */
63 fill_gregset (const struct regcache
*regcache
,
64 gdb_gregset_t
*gregsetp
, int regno
)
66 const struct regset
*regset
= ppc_fbsd_gregset (sizeof (long));
69 memset (gregsetp
, 0, sizeof (*gregsetp
));
70 ppc_collect_gregset (regset
, regcache
, regno
, gregsetp
, sizeof (*gregsetp
));
73 /* Fill GDB's register array with the floating-point register values
77 supply_fpregset (struct regcache
*regcache
, const gdb_fpregset_t
* fpregsetp
)
79 const struct regset
*regset
= ppc_fbsd_fpregset ();
81 ppc_supply_fpregset (regset
, regcache
, -1,
82 fpregsetp
, sizeof (*fpregsetp
));
85 /* Fill register REGNO in *FGREGSETP with the value in GDB's
86 register array. If REGNO is -1 do it for all registers. */
89 fill_fpregset (const struct regcache
*regcache
,
90 gdb_fpregset_t
*fpregsetp
, int regno
)
92 const struct regset
*regset
= ppc_fbsd_fpregset ();
94 ppc_collect_fpregset (regset
, regcache
, regno
,
95 fpregsetp
, sizeof (*fpregsetp
));
98 /* Returns true if PT_GETFPREGS fetches this register. */
101 getfpregs_supplies (struct gdbarch
*gdbarch
, int regno
)
103 ppc_gdbarch_tdep
*tdep
= (ppc_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
105 /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
106 point registers. Traditionally, GDB's register set has still
107 listed the floating point registers for such machines, so this
108 code is harmless. However, the new E500 port actually omits the
109 floating point registers entirely from the register set --- they
110 don't even have register numbers assigned to them.
112 It's not clear to me how best to update this code, so this assert
113 will alert the first person to encounter the NetBSD/E500
114 combination to the problem. */
116 gdb_assert (ppc_floating_point_unit_p (gdbarch
));
118 return ((regno
>= tdep
->ppc_fp0_regnum
119 && regno
< tdep
->ppc_fp0_regnum
+ ppc_num_fprs
)
120 || regno
== tdep
->ppc_fpscr_regnum
);
123 /* Fetch register REGNO from the child process. If REGNO is -1, do it
124 for all registers. */
127 ppc_fbsd_nat_target::fetch_registers (struct regcache
*regcache
, int regno
)
130 pid_t pid
= regcache
->ptid ().lwp ();
132 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
133 perror_with_name (_("Couldn't get registers"));
135 supply_gregset (regcache
, ®s
);
137 if (regno
== -1 || getfpregs_supplies (regcache
->arch (), regno
))
139 const struct regset
*fpregset
= ppc_fbsd_fpregset ();
140 gdb_fpregset_t fpregs
;
142 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
143 perror_with_name (_("Couldn't get FP registers"));
145 ppc_supply_fpregset (fpregset
, regcache
, regno
, &fpregs
, sizeof fpregs
);
149 /* Store register REGNO back into the child process. If REGNO is -1,
150 do this for all registers. */
153 ppc_fbsd_nat_target::store_registers (struct regcache
*regcache
, int regno
)
156 pid_t pid
= regcache
->ptid ().lwp ();
158 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
159 perror_with_name (_("Couldn't get registers"));
161 fill_gregset (regcache
, ®s
, regno
);
163 if (ptrace (PT_SETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
164 perror_with_name (_("Couldn't write registers"));
166 if (regno
== -1 || getfpregs_supplies (regcache
->arch (), regno
))
168 gdb_fpregset_t fpregs
;
170 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
171 perror_with_name (_("Couldn't get FP registers"));
173 fill_fpregset (regcache
, &fpregs
, regno
);
175 if (ptrace (PT_SETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
176 perror_with_name (_("Couldn't set FP registers"));
180 /* Architecture specific function that reconstructs the
181 register state from PCB (Process Control Block) and supplies it
185 ppcfbsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
187 struct gdbarch
*gdbarch
= regcache
->arch ();
188 ppc_gdbarch_tdep
*tdep
= (ppc_gdbarch_tdep
*) gdbarch_tdep (gdbarch
);
191 /* The stack pointer shouldn't be zero. */
192 if (pcb
->pcb_sp
== 0)
195 regcache
->raw_supply (gdbarch_sp_regnum (gdbarch
), &pcb
->pcb_sp
);
196 regcache
->raw_supply (tdep
->ppc_cr_regnum
, &pcb
->pcb_cr
);
197 regcache
->raw_supply (tdep
->ppc_lr_regnum
, &pcb
->pcb_lr
);
198 for (i
= 0, regnum
= tdep
->ppc_gp0_regnum
+ 14; i
< 20; i
++, regnum
++)
199 regcache
->raw_supply (regnum
, &pcb
->pcb_context
[i
]);
204 void _initialize_ppcfbsd_nat ();
206 _initialize_ppcfbsd_nat ()
208 add_inf_child_target (&the_ppc_fbsd_nat_target
);
210 /* Support debugging kernel virtual memory images. */
211 bsd_kvm_add_target (ppcfbsd_supply_pcb
);