1 /* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2019 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);
24 extern const struct target_desc
*tdesc_m68k
;
30 #define m68k_num_regs 29
31 #define m68k_num_gregs 18
33 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
34 static int m68k_regmap
[] =
37 PT_D0
* 4, PT_D1
* 4, PT_D2
* 4, PT_D3
* 4,
38 PT_D4
* 4, PT_D5
* 4, PT_D6
* 4, PT_D7
* 4,
39 PT_A0
* 4, PT_A1
* 4, PT_A2
* 4, PT_A3
* 4,
40 PT_A4
* 4, PT_A5
* 4, PT_A6
* 4, PT_USP
* 4,
43 14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4,
44 7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4,
48 PT_FP0
* 4, PT_FP1
* 4, PT_FP2
* 4, PT_FP3
* 4,
49 PT_FP4
* 4, PT_FP5
* 4, PT_FP6
* 4, PT_FP7
* 4,
50 PT_FPCR
* 4, PT_FPSR
* 4, PT_FPIAR
* 4
52 21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4,
53 39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4
58 m68k_cannot_store_register (int regno
)
60 return (regno
>= m68k_num_regs
);
64 m68k_cannot_fetch_register (int regno
)
66 return (regno
>= m68k_num_regs
);
69 #ifdef HAVE_PTRACE_GETREGS
70 #include <sys/procfs.h>
71 #include "nat/gdb_ptrace.h"
74 m68k_fill_gregset (struct regcache
*regcache
, void *buf
)
78 for (i
= 0; i
< m68k_num_gregs
; i
++)
79 collect_register (regcache
, i
, (char *) buf
+ m68k_regmap
[i
]);
83 m68k_store_gregset (struct regcache
*regcache
, const void *buf
)
87 for (i
= 0; i
< m68k_num_gregs
; i
++)
88 supply_register (regcache
, i
, (const char *) buf
+ m68k_regmap
[i
]);
92 m68k_fill_fpregset (struct regcache
*regcache
, void *buf
)
96 for (i
= m68k_num_gregs
; i
< m68k_num_regs
; i
++)
97 collect_register (regcache
, i
, ((char *) buf
98 + (m68k_regmap
[i
] - m68k_regmap
[m68k_num_gregs
])));
102 m68k_store_fpregset (struct regcache
*regcache
, const void *buf
)
106 for (i
= m68k_num_gregs
; i
< m68k_num_regs
; i
++)
107 supply_register (regcache
, i
, ((const char *) buf
108 + (m68k_regmap
[i
] - m68k_regmap
[m68k_num_gregs
])));
111 #endif /* HAVE_PTRACE_GETREGS */
113 static struct regset_info m68k_regsets
[] = {
114 #ifdef HAVE_PTRACE_GETREGS
115 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
117 m68k_fill_gregset
, m68k_store_gregset
},
118 { PTRACE_GETFPREGS
, PTRACE_SETFPREGS
, 0, sizeof (elf_fpregset_t
),
120 m68k_fill_fpregset
, m68k_store_fpregset
},
121 #endif /* HAVE_PTRACE_GETREGS */
125 static const gdb_byte m68k_breakpoint
[] = { 0x4E, 0x4F };
126 #define m68k_breakpoint_len 2
128 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
130 static const gdb_byte
*
131 m68k_sw_breakpoint_from_kind (int kind
, int *size
)
133 *size
= m68k_breakpoint_len
;
134 return m68k_breakpoint
;
138 m68k_breakpoint_at (CORE_ADDR pc
)
142 read_inferior_memory (pc
, c
, 2);
143 if (c
[0] == 0x4E && c
[1] == 0x4F)
149 #include <asm/ptrace.h>
151 #ifdef PTRACE_GET_THREAD_AREA
152 /* Fetch the thread-local storage pointer for libthread_db. */
155 ps_get_thread_area (struct ps_prochandle
*ph
,
156 lwpid_t lwpid
, int idx
, void **base
)
158 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
161 /* IDX is the bias from the thread pointer to the beginning of the
162 thread descriptor. It has to be subtracted due to implementation
163 quirks in libthread_db. */
164 *base
= (void *) ((char *)*base
- idx
);
168 #endif /* PTRACE_GET_THREAD_AREA */
170 static struct regsets_info m68k_regsets_info
=
172 m68k_regsets
, /* regsets */
174 NULL
, /* disabled_regsets */
177 static struct usrregs_info m68k_usrregs_info
=
183 static struct regs_info regs_info
=
185 NULL
, /* regset_bitmap */
190 static const struct regs_info
*
191 m68k_regs_info (void)
197 m68k_arch_setup (void)
199 current_process ()->tdesc
= tdesc_m68k
;
202 /* Support for hardware single step. */
205 m68k_supports_hardware_single_step (void)
210 struct linux_target_ops the_low_target
= {
213 m68k_cannot_fetch_register
,
214 m68k_cannot_store_register
,
215 NULL
, /* fetch_register */
218 NULL
, /* breakpoint_kind_from_pc */
219 m68k_sw_breakpoint_from_kind
,
223 NULL
, /* supports_z_point_type */
224 NULL
, /* insert_point */
225 NULL
, /* remove_point */
226 NULL
, /* stopped_by_watchpoint */
227 NULL
, /* stopped_data_address */
228 NULL
, /* collect_ptrace_register */
229 NULL
, /* supply_ptrace_register */
230 NULL
, /* siginfo_fixup */
231 NULL
, /* new_process */
232 NULL
, /* delete_process */
233 NULL
, /* new_thread */
234 NULL
, /* delete_thread */
236 NULL
, /* prepare_to_resume */
237 NULL
, /* process_qsupported */
238 NULL
, /* supports_tracepoints */
239 NULL
, /* get_thread_area */
240 NULL
, /* install_fast_tracepoint_jump_pad */
242 NULL
, /* get_min_fast_tracepoint_insn_len */
243 NULL
, /* supports_range_stepping */
244 NULL
, /* breakpoint_kind_from_current_state */
245 m68k_supports_hardware_single_step
,
249 initialize_low_arch (void)
251 /* Initialize the Linux target descriptions. */
252 init_registers_m68k ();
254 initialize_regsets_info (&m68k_regsets_info
);