1 /* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-1996, 1998-2005, 2007-2012 Free Software
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/>. */
21 #include "linux-low.h"
23 /* Defined in auto-generated file reg-m68k.c. */
24 void init_registers_m68k (void);
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 <sys/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 struct regset_info target_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 */
122 { 0, 0, 0, -1, -1, NULL, NULL }
125 static const unsigned char m68k_breakpoint[] = { 0x4E, 0x4F };
126 #define m68k_breakpoint_len 2
129 m68k_get_pc (struct regcache *regcache)
133 collect_register_by_name (regcache, "pc", &pc);
138 m68k_set_pc (struct regcache *regcache, CORE_ADDR value)
140 unsigned long newpc = value;
142 supply_register_by_name (regcache, "pc", &newpc);
146 m68k_breakpoint_at (CORE_ADDR pc)
150 read_inferior_memory (pc, c, 2);
151 if (c[0] == 0x4E && c[1] == 0x4F)
157 #include <asm/ptrace.h>
159 #ifdef PTRACE_GET_THREAD_AREA
160 /* Fetch the thread-local storage pointer for libthread_db. */
163 ps_get_thread_area (const struct ps_prochandle *ph,
164 lwpid_t lwpid, int idx, void **base)
166 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
169 /* IDX is the bias from the thread pointer to the beginning of the
170 thread descriptor. It has to be subtracted due to implementation
171 quirks in libthread_db. */
172 *base = (void *) ((char *)*base - idx);
176 #endif /* PTRACE_GET_THREAD_AREA */
178 struct linux_target_ops the_low_target = {
183 m68k_cannot_fetch_register,
184 m68k_cannot_store_register,
185 NULL, /* fetch_register */