1 /* GNU/Linux/Nios II specific low level interface, for the remote server for
3 Copyright (C) 2008-2014 Free Software Foundation, Inc.
5 Contributed by Mentor Graphics, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "linux-low.h"
24 #include <sys/ptrace.h>
26 #include "gdb_proc_service.h"
27 #include <asm/ptrace.h>
29 #ifndef PTRACE_GET_THREAD_AREA
30 #define PTRACE_GET_THREAD_AREA 25
33 /* The following definition must agree with the number of registers
34 defined in "struct user_regs" in GLIBC
35 (ports/sysdeps/unix/sysv/linux/nios2/sys/user.h), and also with
36 NIOS2_NUM_REGS in GDB proper. */
38 #define nios2_num_regs 49
40 /* Defined in auto-generated file nios2-linux.c. */
42 void init_registers_nios2_linux (void);
43 extern const struct target_desc
*tdesc_nios2_linux
;
45 /* This union is used to convert between int and byte buffer
46 representations of register contents. */
54 /* Return the ptrace ``address'' of register REGNO. */
56 static int nios2_regmap
[] = {
57 -1, 1, 2, 3, 4, 5, 6, 7,
58 8, 9, 10, 11, 12, 13, 14, 15,
59 16, 17, 18, 19, 20, 21, 22, 23,
60 24, 25, 26, 27, 28, 29, 30, 31,
61 32, 33, 34, 35, 36, 37, 38, 39,
62 40, 41, 42, 43, 44, 45, 46, 47,
67 /* Implement the arch_setup linux_target_ops method. */
70 nios2_arch_setup (void)
72 current_process ()->tdesc
= tdesc_nios2_linux
;
75 /* Implement the cannot_fetch_register linux_target_ops method. */
78 nios2_cannot_fetch_register (int regno
)
80 if (nios2_regmap
[regno
] == -1)
86 /* Implement the cannot_store_register linux_target_ops method. */
89 nios2_cannot_store_register (int regno
)
91 if (nios2_regmap
[regno
] == -1)
97 /* Implement the get_pc linux_target_ops method. */
100 nios2_get_pc (struct regcache
*regcache
)
102 union nios2_register pc
;
104 collect_register_by_name (regcache
, "pc", pc
.buf
);
108 /* Implement the set_pc linux_target_ops method. */
111 nios2_set_pc (struct regcache
*regcache
, CORE_ADDR pc
)
113 union nios2_register newpc
;
116 supply_register_by_name (regcache
, "pc", newpc
.buf
);
119 /* Breakpoint support. */
121 static const unsigned int nios2_breakpoint
= 0x003b6ffa;
122 #define nios2_breakpoint_len 4
124 /* Implement the breakpoint_reinsert_addr linux_target_ops method. */
127 nios2_reinsert_addr (void)
129 union nios2_register ra
;
130 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
132 collect_register_by_name (regcache
, "ra", ra
.buf
);
136 /* Implement the breakpoint_at linux_target_ops method. */
139 nios2_breakpoint_at (CORE_ADDR where
)
143 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
144 if (insn
== nios2_breakpoint
)
149 /* Fetch the thread-local storage pointer for libthread_db. */
152 ps_get_thread_area (const struct ps_prochandle
*ph
,
153 lwpid_t lwpid
, int idx
, void **base
)
155 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
158 /* IDX is the bias from the thread pointer to the beginning of the
159 thread descriptor. It has to be subtracted due to implementation
160 quirks in libthread_db. */
161 *base
= (void *) ((char *) *base
- idx
);
166 #ifdef HAVE_PTRACE_GETREGS
168 /* Helper functions to collect/supply a single register REGNO. */
171 nios2_collect_register (struct regcache
*regcache
, int regno
,
172 union nios2_register
*reg
)
174 union nios2_register tmp_reg
;
176 collect_register (regcache
, regno
, &tmp_reg
.reg32
);
177 reg
->reg32
= tmp_reg
.reg32
;
181 nios2_supply_register (struct regcache
*regcache
, int regno
,
182 const union nios2_register
*reg
)
184 supply_register (regcache
, regno
, reg
->buf
);
187 /* We have only a single register set on Nios II. */
190 nios2_fill_gregset (struct regcache
*regcache
, void *buf
)
192 union nios2_register
*regset
= buf
;
195 for (i
= 1; i
< nios2_num_regs
; i
++)
196 nios2_collect_register (regcache
, i
, regset
+ i
);
200 nios2_store_gregset (struct regcache
*regcache
, const void *buf
)
202 const union nios2_register
*regset
= buf
;
205 for (i
= 0; i
< nios2_num_regs
; i
++)
206 nios2_supply_register (regcache
, i
, regset
+ i
);
208 #endif /* HAVE_PTRACE_GETREGS */
210 static struct regset_info nios2_regsets
[] =
212 #ifdef HAVE_PTRACE_GETREGS
213 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, nios2_num_regs
* 4, GENERAL_REGS
,
214 nios2_fill_gregset
, nios2_store_gregset
},
215 #endif /* HAVE_PTRACE_GETREGS */
216 { 0, 0, 0, -1, -1, NULL
, NULL
}
219 static struct regsets_info nios2_regsets_info
=
221 nios2_regsets
, /* regsets */
223 NULL
, /* disabled_regsets */
226 static struct usrregs_info nios2_usrregs_info
=
232 static struct regs_info regs_info
=
234 NULL
, /* regset_bitmap */
239 static const struct regs_info
*
240 nios2_regs_info (void)
245 struct linux_target_ops the_low_target
=
249 nios2_cannot_fetch_register
,
250 nios2_cannot_store_register
,
254 (const unsigned char *) &nios2_breakpoint
,
255 nios2_breakpoint_len
,
262 initialize_low_arch (void)
264 init_registers_nios2_linux ();
266 initialize_regsets_info (&nios2_regsets_info
);