1 /* Motorola m68k native support for Linux
2 Copyright (C) 1996,1998 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 2 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, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
28 #include <sys/types.h>
31 #include <sys/param.h>
35 #include <sys/ioctl.h>
37 #include <sys/procfs.h>
42 #include "floatformat.h"
47 /* This table must line up with REGISTER_NAMES in tm-m68k.h */
48 static const int regmap[] =
50 PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
51 PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
53 /* PT_FP0, ..., PT_FP7 */
54 21, 24, 27, 30, 33, 36, 39, 42,
55 /* PT_FPCR, PT_FPSR, PT_FPIAR */
59 /* BLOCKEND is the value of u.u_ar0, and points to the place where GS
63 m68k_linux_register_u_addr (blockend, regnum)
67 return (blockend + 4 * regmap[regnum]);
70 /* Given a pointer to a general register set in /proc format (gregset_t *),
71 unpack the register contents and supply them as gdb's idea of the current
75 /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
76 for supply_gregset and supply_fpregset. The definitions
77 in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
78 the definitions in m68klinux-nat.c will be used. This is a
79 bit of a hack. The supply_* routines do not belong in
80 *_tdep.c files. But, there are several lynx ports that currently
81 depend on these definitions. */
86 supply_gregset (gregsetp)
91 for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++)
92 supply_register (regi, (char *) (*gregsetp + regmap[regi]));
93 supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
94 supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
97 /* Given a pointer to a floating point register set in /proc format
98 (fpregset_t *), unpack the register contents and supply them as gdb's
99 idea of the current floating point register values. */
102 supply_fpregset (fpregsetp)
103 fpregset_t *fpregsetp;
107 for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
108 supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
109 supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
110 supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
111 supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
120 return (sizeof (struct user));
123 /* Return non-zero if PC points into the signal trampoline. */
130 char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
133 sp = read_register (SP_REGNUM);
137 if (read_memory_nobpt (pc, buf, sizeof (buf)))
139 insn = extract_unsigned_integer (buf, sizeof (buf));
140 if (insn == 0xdefc /* addaw #,sp */
141 || insn == 0x7077 /* moveq #119,d0 */
142 || insn == 0x4e40 /* trap #0 */
143 || insn == 0x203c /* movel #,d0 */ )
146 if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
148 insn = extract_unsigned_integer (buf, sizeof (buf));
149 if (insn == 0xdefc /* addaw #,sp */
150 || insn == 0x7077 /* moveq #119,d0 */
151 || insn == 0x4e40 /* trap #0 */
152 || insn == 0x203c /* movel #,d0 */ )