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"
34 struct m68k_bsd_nat_target final
: public inf_ptrace_target
36 void fetch_registers (struct regcache
*, int) override
;
37 void store_registers (struct regcache
*, int) override
;
40 static m68k_bsd_nat_target the_m68k_bsd_nat_target
;
43 m68kbsd_gregset_supplies_p (int regnum
)
45 return (regnum
>= M68K_D0_REGNUM
&& regnum
<= M68K_PC_REGNUM
);
49 m68kbsd_fpregset_supplies_p (int regnum
)
51 return (regnum
>= M68K_FP0_REGNUM
&& regnum
<= M68K_FPI_REGNUM
);
54 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */
57 m68kbsd_supply_gregset (struct regcache
*regcache
, const void *gregs
)
59 const char *regs
= gregs
;
62 for (regnum
= M68K_D0_REGNUM
; regnum
<= M68K_PC_REGNUM
; regnum
++)
63 regcache
->raw_supply (regnum
, regs
+ regnum
* 4);
66 /* Supply the floating-point registers stored in FPREGS to REGCACHE. */
69 m68kbsd_supply_fpregset (struct regcache
*regcache
, const void *fpregs
)
71 struct gdbarch
*gdbarch
= regcache
->arch ();
72 const char *regs
= fpregs
;
75 for (regnum
= M68K_FP0_REGNUM
; regnum
<= M68K_FPI_REGNUM
; regnum
++)
76 regcache
->raw_supply (regnum
,
77 regs
+ m68kbsd_fpreg_offset (gdbarch
, regnum
));
80 /* Collect the general-purpose registers from REGCACHE and store them
84 m68kbsd_collect_gregset (const struct regcache
*regcache
,
85 void *gregs
, int regnum
)
90 for (i
= M68K_D0_REGNUM
; i
<= M68K_PC_REGNUM
; i
++)
92 if (regnum
== -1 || regnum
== i
)
93 regcache
->raw_collect (i
, regs
+ i
* 4);
97 /* Collect the floating-point registers from REGCACHE and store them
101 m68kbsd_collect_fpregset (struct regcache
*regcache
,
102 void *fpregs
, int regnum
)
104 struct gdbarch
*gdbarch
= regcache
->arch ();
108 for (i
= M68K_FP0_REGNUM
; i
<= M68K_FPI_REGNUM
; i
++)
110 if (regnum
== -1 || regnum
== i
)
111 regcache
->raw_collect (i
, regs
+ m68kbsd_fpreg_offset (gdbarch
, i
));
116 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
117 for all registers (including the floating-point registers). */
120 m68k_bsd_nat_target::fetch_registers (struct regcache
*regcache
, int regnum
)
122 pid_t pid
= regcache
->ptid ().pid ();
124 if (regnum
== -1 || m68kbsd_gregset_supplies_p (regnum
))
128 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
129 perror_with_name (_("Couldn't get registers"));
131 m68kbsd_supply_gregset (regcache
, ®s
);
134 if (regnum
== -1 || m68kbsd_fpregset_supplies_p (regnum
))
138 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
139 perror_with_name (_("Couldn't get floating point status"));
141 m68kbsd_supply_fpregset (regcache
, &fpregs
);
145 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
146 this for all registers (including the floating-point registers). */
149 m68k_bsd_nat_target::store_registers (struct regcache
*regcache
, int regnum
)
151 pid_t pid
= regcache
->ptid ().pid ();
153 if (regnum
== -1 || m68kbsd_gregset_supplies_p (regnum
))
157 if (ptrace (PT_GETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
158 perror_with_name (_("Couldn't get registers"));
160 m68kbsd_collect_gregset (regcache
, ®s
, regnum
);
162 if (ptrace (PT_SETREGS
, pid
, (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
163 perror_with_name (_("Couldn't write registers"));
166 if (regnum
== -1 || m68kbsd_fpregset_supplies_p (regnum
))
170 if (ptrace (PT_GETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
171 perror_with_name (_("Couldn't get floating point status"));
173 m68kbsd_collect_fpregset (regcache
, &fpregs
, regnum
);
175 if (ptrace (PT_SETFPREGS
, pid
, (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
176 perror_with_name (_("Couldn't write floating point status"));
181 /* Support for debugging kernel virtual memory images. */
183 #include <machine/pcb.h>
187 /* OpenBSD doesn't have these. */
189 #define PCB_REGS_FP 10
192 #define PCB_REGS_SP 11
196 m68kbsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
201 /* The following is true for NetBSD 1.6.2:
203 The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for
204 all callee-saved registers. From this information we reconstruct
205 the register state as it would look when we just returned from
208 /* The stack pointer shouldn't be zero. */
209 if (pcb
->pcb_regs
[PCB_REGS_SP
] == 0)
212 for (regnum
= M68K_D2_REGNUM
; regnum
<= M68K_D7_REGNUM
; regnum
++)
213 regcache
->raw_supply (regnum
, &pcb
->pcb_regs
[i
++]);
214 for (regnum
= M68K_A2_REGNUM
; regnum
<= M68K_SP_REGNUM
; regnum
++)
215 regcache
->raw_supply (regnum
, &pcb
->pcb_regs
[i
++]);
217 tmp
= pcb
->pcb_ps
& 0xffff;
218 regcache
->raw_supply (M68K_PS_REGNUM
, &tmp
);
220 read_memory (pcb
->pcb_regs
[PCB_REGS_FP
] + 4, (char *) &tmp
, sizeof tmp
);
221 regcache
->raw_supply (M68K_PC_REGNUM
, &tmp
);
226 void _initialize_m68kbsd_nat ();
228 _initialize_m68kbsd_nat ()
230 add_inf_child_target (&the_m68k_bsd_nat_target
);
232 /* Support debugging kernel virtual memory images. */
233 bsd_kvm_add_target (m68kbsd_supply_pcb
);