1 /* Native-dependent code for Motorola 68000 BSD's.
3 Copyright (C) 2004-2020 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/>. */
20 /* We define this to get types like register_t. */
27 #include <sys/types.h>
28 #include <sys/ptrace.h>
29 #include <machine/reg.h>
31 #include "m68k-tdep.h"
32 #include "inf-ptrace.h"
35 struct m68k_bsd_nat_target final
: public nbsd_nat_target
37 void fetch_registers (struct regcache
*, int) override
;
38 void store_registers (struct regcache
*, int) override
;
41 static m68k_bsd_nat_target the_m68k_bsd_nat_target
;
44 m68kbsd_gregset_supplies_p (int regnum
)
46 return (regnum
>= M68K_D0_REGNUM
&& regnum
<= M68K_PC_REGNUM
);
50 m68kbsd_fpregset_supplies_p (int regnum
)
52 return (regnum
>= M68K_FP0_REGNUM
&& regnum
<= M68K_FPI_REGNUM
);
55 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
58 m68kbsd_supply_gregset (struct regcache
*regcache
, const void *gregs
)
60 const gdb_byte
*regs
= (const gdb_byte
*) gregs
;
63 for (regnum
= M68K_D0_REGNUM
; regnum
<= M68K_PC_REGNUM
; regnum
++)
64 regcache
->raw_supply (regnum
, regs
+ regnum
* 4);
67 /* Supply the floating-point registers stored in FPREGS to REGCACHE. */
70 m68kbsd_supply_fpregset (struct regcache
*regcache
, const void *fpregs
)
72 struct gdbarch
*gdbarch
= regcache
->arch ();
73 const gdb_byte
*regs
= (const gdb_byte
*) fpregs
;
76 for (regnum
= M68K_FP0_REGNUM
; regnum
<= M68K_FPI_REGNUM
; regnum
++)
77 regcache
->raw_supply (regnum
,
78 regs
+ m68kbsd_fpreg_offset (gdbarch
, regnum
));
81 /* Collect the general-purpose registers from REGCACHE and store them
85 m68kbsd_collect_gregset (const struct regcache
*regcache
,
86 void *gregs
, int regnum
)
88 gdb_byte
*regs
= (gdb_byte
*) gregs
;
91 for (i
= M68K_D0_REGNUM
; i
<= M68K_PC_REGNUM
; i
++)
93 if (regnum
== -1 || regnum
== i
)
94 regcache
->raw_collect (i
, regs
+ i
* 4);
98 /* Collect the floating-point registers from REGCACHE and store them
102 m68kbsd_collect_fpregset (struct regcache
*regcache
,
103 void *fpregs
, int regnum
)
105 struct gdbarch
*gdbarch
= regcache
->arch ();
109 for (i
= M68K_FP0_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
111 if (regnum
== -1 || regnum
== i
)
112 regcache
->raw_collect (i
, regs
+ m68kbsd_fpreg_offset (gdbarch
, i
));
117 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
118 for all registers (including the floating-point registers). */
121 m68k_bsd_nat_target::fetch_registers (struct regcache
*regcache
, int regnum
)
123 pid_t pid
= regcache
->ptid ().pid ();
125 if (regnum
== -1 || m68kbsd_gregset_supplies_p (regnum
))
129 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
130 perror_with_name (_("Couldn't get registers"));
132 m68kbsd_supply_gregset (regcache
, ®s
);
135 if (regnum
== -1 || m68kbsd_fpregset_supplies_p (regnum
))
139 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
140 perror_with_name (_("Couldn't get floating point status"));
142 m68kbsd_supply_fpregset (regcache
, &fpregs
);
146 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
147 this for all registers (including the floating-point registers). */
150 m68k_bsd_nat_target::store_registers (struct regcache
*regcache
, int regnum
)
152 pid_t pid
= regcache
->ptid ().pid ();
154 if (regnum
== -1 || m68kbsd_gregset_supplies_p (regnum
))
158 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
159 perror_with_name (_("Couldn't get registers"));
161 m68kbsd_collect_gregset (regcache
, ®s
, regnum
);
163 if (ptrace (PT_SETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
164 perror_with_name (_("Couldn't write registers"));
167 if (regnum
== -1 || m68kbsd_fpregset_supplies_p (regnum
))
171 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
172 perror_with_name (_("Couldn't get floating point status"));
174 m68kbsd_collect_fpregset (regcache
, &fpregs
, regnum
);
176 if (ptrace (PT_SETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
177 perror_with_name (_("Couldn't write floating point status"));
182 /* Support for debugging kernel virtual memory images. */
184 #include <machine/pcb.h>
188 /* OpenBSD doesn't have these. */
190 #define PCB_REGS_FP 10
193 #define PCB_REGS_SP 11
197 m68kbsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
202 /* The following is true for NetBSD 1.6.2:
204 The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for
205 all callee-saved registers. From this information we reconstruct
206 the register state as it would look when we just returned from
209 /* The stack pointer shouldn't be zero. */
210 if (pcb
->pcb_regs
[PCB_REGS_SP
] == 0)
213 for (regnum
= M68K_D2_REGNUM
; regnum
<= M68K_D7_REGNUM
; regnum
++)
214 regcache
->raw_supply (regnum
, &pcb
->pcb_regs
[i
++]);
215 for (regnum
= M68K_A2_REGNUM
; regnum
<= M68K_SP_REGNUM
; regnum
++)
216 regcache
->raw_supply (regnum
, &pcb
->pcb_regs
[i
++]);
218 tmp
= pcb
->pcb_ps
& 0xffff;
219 regcache
->raw_supply (M68K_PS_REGNUM
, &tmp
);
221 read_memory (pcb
->pcb_regs
[PCB_REGS_FP
] + 4, (gdb_byte
*) &tmp
, sizeof tmp
);
222 regcache
->raw_supply (M68K_PC_REGNUM
, &tmp
);
227 void _initialize_m68kbsd_nat ();
229 _initialize_m68kbsd_nat ()
231 add_inf_child_target (&the_m68k_bsd_nat_target
);
233 /* Support debugging kernel virtual memory images. */
234 bsd_kvm_add_target (m68kbsd_supply_pcb
);