1 /* Native-dependent code for GNU/Linux m32r.
3 Copyright (C) 2004-2017 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/>. */
24 #include "linux-nat.h"
26 #include "nat/gdb_ptrace.h"
28 #include <sys/procfs.h>
29 #include "inf-ptrace.h"
31 /* Prototypes for supply_gregset etc. */
34 #include "m32r-tdep.h"
39 /* Since EVB register is not available for native debug, we reduce
40 the number of registers. */
41 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
43 /* Mapping between the general-purpose registers in `struct user'
44 format and GDB's register array layout. */
45 static int regmap
[] = {
46 4, 5, 6, 7, 0, 1, 2, 8,
47 9, 10, 11, 12, 13, 24, 25, 23,
48 19, 19, 26, 23, 22, 20, 16, 15
52 #define BBPSW_REGMAP 21
56 /* Doee (??) apply to the corresponding SET requests as well. */
57 #define GETREGS_SUPPLIES(regno) (0 <= (regno) \
58 && (regno) <= M32R_LINUX_NUM_REGS)
62 /* Transfering the general-purpose registers between GDB, inferiors
65 /* Fill GDB's register array with the general-purpose register values
69 supply_gregset (struct regcache
*regcache
, const elf_gregset_t
* gregsetp
)
71 const elf_greg_t
*regp
= (const elf_greg_t
*) gregsetp
;
73 unsigned long psw
, bbpsw
;
75 psw
= *(regp
+ PSW_REGMAP
);
76 bbpsw
= *(regp
+ BBPSW_REGMAP
);
78 for (i
= 0; i
< M32R_LINUX_NUM_REGS
; i
++)
85 regval
= ((0x00c1 & bbpsw
) << 8) | ((0xc100 & psw
) >> 8);
88 regval
= ((psw
>> 8) & 1);
91 regval
= *(regp
+ regmap
[i
]);
95 if (i
!= M32R_SP_REGNUM
)
96 regcache_raw_supply (regcache
, i
, ®val
);
97 else if (psw
& 0x8000)
98 regcache_raw_supply (regcache
, i
, regp
+ SPU_REGMAP
);
100 regcache_raw_supply (regcache
, i
, regp
+ SPI_REGMAP
);
104 /* Fetch all general-purpose registers from process/thread TID and
105 store their values in GDB's register array. */
108 fetch_regs (struct regcache
*regcache
, int tid
)
112 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
113 perror_with_name (_("Couldn't get registers"));
115 supply_gregset (regcache
, (const elf_gregset_t
*) ®s
);
118 /* Fill register REGNO (if it is a general-purpose register) in
119 *GREGSETPS with the value in GDB's register array. If REGNO is -1,
120 do this for all registers. */
123 fill_gregset (const struct regcache
*regcache
,
124 elf_gregset_t
* gregsetp
, int regno
)
126 elf_greg_t
*regp
= (elf_greg_t
*) gregsetp
;
128 unsigned long psw
, bbpsw
, tmp
;
130 psw
= *(regp
+ PSW_REGMAP
);
131 bbpsw
= *(regp
+ BBPSW_REGMAP
);
133 for (i
= 0; i
< M32R_LINUX_NUM_REGS
; i
++)
135 if (regno
!= -1 && regno
!= i
)
138 if (i
== CBR_REGNUM
|| i
== PSW_REGNUM
)
141 if (i
== SPU_REGNUM
|| i
== SPI_REGNUM
)
144 if (i
!= M32R_SP_REGNUM
)
145 regcache_raw_collect (regcache
, i
, regp
+ regmap
[i
]);
146 else if (psw
& 0x8000)
147 regcache_raw_collect (regcache
, i
, regp
+ SPU_REGMAP
);
149 regcache_raw_collect (regcache
, i
, regp
+ SPI_REGMAP
);
153 /* Store all valid general-purpose registers in GDB's register array
154 into the process/thread specified by TID. */
157 store_regs (const struct regcache
*regcache
, int tid
, int regno
)
161 if (ptrace (PTRACE_GETREGS
, tid
, 0, (int) ®s
) < 0)
162 perror_with_name (_("Couldn't get registers"));
164 fill_gregset (regcache
, ®s
, regno
);
166 if (ptrace (PTRACE_SETREGS
, tid
, 0, (int) ®s
) < 0)
167 perror_with_name (_("Couldn't write registers"));
172 /* Transfering floating-point registers between GDB, inferiors and cores.
173 Since M32R has no floating-point registers, these functions do nothing. */
176 supply_fpregset (struct regcache
*regcache
, const gdb_fpregset_t
*fpregs
)
181 fill_fpregset (const struct regcache
*regcache
,
182 gdb_fpregset_t
*fpregs
, int regno
)
188 /* Transferring arbitrary registers between GDB and inferior. */
190 /* Fetch register REGNO from the child process. If REGNO is -1, do
191 this for all registers (including the floating point and SSE
195 m32r_linux_fetch_inferior_registers (struct target_ops
*ops
,
196 struct regcache
*regcache
, int regno
)
198 pid_t tid
= get_ptrace_pid (regcache_get_ptid (regcache
));
200 /* Use the PTRACE_GETREGS request whenever possible, since it
201 transfers more registers in one system call, and we'll cache the
203 if (regno
== -1 || GETREGS_SUPPLIES (regno
))
205 fetch_regs (regcache
, tid
);
209 internal_error (__FILE__
, __LINE__
,
210 _("Got request for bad register number %d."), regno
);
213 /* Store register REGNO back into the child process. If REGNO is -1,
214 do this for all registers (including the floating point and SSE
217 m32r_linux_store_inferior_registers (struct target_ops
*ops
,
218 struct regcache
*regcache
, int regno
)
220 pid_t tid
= get_ptrace_pid (regcache_get_ptid (regcache
));
222 /* Use the PTRACE_SETREGS request whenever possible, since it
223 transfers more registers in one system call. */
224 if (regno
== -1 || GETREGS_SUPPLIES (regno
))
226 store_regs (regcache
, tid
, regno
);
230 internal_error (__FILE__
, __LINE__
,
231 _("Got request to store bad register number %d."), regno
);
235 _initialize_m32r_linux_nat (void)
237 struct target_ops
*t
;
239 /* Fill in the generic GNU/Linux methods. */
242 /* Add our register access methods. */
243 t
->to_fetch_registers
= m32r_linux_fetch_inferior_registers
;
244 t
->to_store_registers
= m32r_linux_store_inferior_registers
;
246 /* Register the target. */
247 linux_nat_add_target (t
);