1 /* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2013 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
22 /* Defined in auto-generated file reg-m68k.c. */
23 void init_registers_m68k (void);
29 #define m68k_num_regs 29
30 #define m68k_num_gregs 18
32 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
33 static int m68k_regmap
[] =
36 PT_D0
* 4, PT_D1
* 4, PT_D2
* 4, PT_D3
* 4,
37 PT_D4
* 4, PT_D5
* 4, PT_D6
* 4, PT_D7
* 4,
38 PT_A0
* 4, PT_A1
* 4, PT_A2
* 4, PT_A3
* 4,
39 PT_A4
* 4, PT_A5
* 4, PT_A6
* 4, PT_USP
* 4,
42 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4,
43 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4,
47 PT_FP0
* 4, PT_FP1
* 4, PT_FP2
* 4, PT_FP3
* 4,
48 PT_FP4
* 4, PT_FP5
* 4, PT_FP6
* 4, PT_FP7
* 4,
49 PT_FPCR
* 4, PT_FPSR
* 4, PT_FPIAR
* 4
51 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4,
52 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4
57 m68k_cannot_store_register (int regno
)
59 return (regno
>= m68k_num_regs
);
63 m68k_cannot_fetch_register (int regno
)
65 return (regno
>= m68k_num_regs
);
68 #ifdef HAVE_PTRACE_GETREGS
69 #include <sys/procfs.h>
70 #include <sys/ptrace.h>
73 m68k_fill_gregset (struct regcache
*regcache
, void *buf
)
77 for (i
= 0; i
< m68k_num_gregs
; i
++)
78 collect_register (regcache
, i
, (char *) buf
+ m68k_regmap
[i
]);
82 m68k_store_gregset (struct regcache
*regcache
, const void *buf
)
86 for (i
= 0; i
< m68k_num_gregs
; i
++)
87 supply_register (regcache
, i
, (const char *) buf
+ m68k_regmap
[i
]);
91 m68k_fill_fpregset (struct regcache
*regcache
, void *buf
)
95 for (i
= m68k_num_gregs
; i
< m68k_num_regs
; i
++)
96 collect_register (regcache
, i
, ((char *) buf
97 + (m68k_regmap
[i
] - m68k_regmap
[m68k_num_gregs
])));
101 m68k_store_fpregset (struct regcache
*regcache
, const void *buf
)
105 for (i
= m68k_num_gregs
; i
< m68k_num_regs
; i
++)
106 supply_register (regcache
, i
, ((const char *) buf
107 + (m68k_regmap
[i
] - m68k_regmap
[m68k_num_gregs
])));
110 #endif /* HAVE_PTRACE_GETREGS */
112 struct regset_info target_regsets
[] = {
113 #ifdef HAVE_PTRACE_GETREGS
114 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
116 m68k_fill_gregset
, m68k_store_gregset
},
117 { PTRACE_GETFPREGS
, PTRACE_SETFPREGS
, 0, sizeof (elf_fpregset_t
),
119 m68k_fill_fpregset
, m68k_store_fpregset
},
120 #endif /* HAVE_PTRACE_GETREGS */
121 { 0, 0, 0, -1, -1, NULL
, NULL
}
124 static const unsigned char m68k_breakpoint
[] = { 0x4E, 0x4F };
125 #define m68k_breakpoint_len 2
128 m68k_get_pc (struct regcache
*regcache
)
132 collect_register_by_name (regcache
, "pc", &pc
);
137 m68k_set_pc (struct regcache
*regcache
, CORE_ADDR value
)
139 unsigned long newpc
= value
;
141 supply_register_by_name (regcache
, "pc", &newpc
);
145 m68k_breakpoint_at (CORE_ADDR pc
)
149 read_inferior_memory (pc
, c
, 2);
150 if (c
[0] == 0x4E && c
[1] == 0x4F)
156 #include <asm/ptrace.h>
158 #ifdef PTRACE_GET_THREAD_AREA
159 /* Fetch the thread-local storage pointer for libthread_db. */
162 ps_get_thread_area (const struct ps_prochandle
*ph
,
163 lwpid_t lwpid
, int idx
, void **base
)
165 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
168 /* IDX is the bias from the thread pointer to the beginning of the
169 thread descriptor. It has to be subtracted due to implementation
170 quirks in libthread_db. */
171 *base
= (void *) ((char *)*base
- idx
);
175 #endif /* PTRACE_GET_THREAD_AREA */
177 struct linux_target_ops the_low_target
= {
182 m68k_cannot_fetch_register
,
183 m68k_cannot_store_register
,
184 NULL
, /* fetch_register */