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1994dc7c EE |
1 | /* Motorola m68k native support for Linux |
2 | Copyright (C) 1996,1998 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "language.h" | |
24 | #include "gdbcore.h" | |
25 | ||
26 | #ifdef USG | |
27 | #include <sys/types.h> | |
28 | #endif | |
29 | ||
30 | #include <sys/param.h> | |
31 | #include <sys/dir.h> | |
32 | #include <signal.h> | |
33 | #include <sys/user.h> | |
34 | #include <sys/ioctl.h> | |
35 | #include <fcntl.h> | |
36 | #include <sys/procfs.h> | |
37 | ||
38 | #include <sys/file.h> | |
39 | #include "gdb_stat.h" | |
40 | ||
41 | #include "floatformat.h" | |
42 | ||
43 | #include "target.h" | |
44 | ||
45 | \f | |
46 | /* This table must line up with REGISTER_NAMES in tm-m68k.h */ | |
47 | static const int regmap[] = | |
48 | { | |
49 | PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, | |
50 | PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, | |
51 | PT_SR, PT_PC, | |
52 | /* PT_FP0, ..., PT_FP7 */ | |
53 | 21, 24, 27, 30, 33, 36, 39, 42, | |
54 | /* PT_FPCR, PT_FPSR, PT_FPIAR */ | |
55 | 45, 46, 47 | |
56 | }; | |
57 | ||
58 | /* BLOCKEND is the value of u.u_ar0, and points to the place where GS | |
59 | is stored. */ | |
60 | ||
61 | int | |
62 | m68k_linux_register_u_addr (blockend, regnum) | |
63 | int blockend; | |
64 | int regnum; | |
65 | { | |
66 | return (blockend + 4 * regmap[regnum]); | |
67 | } | |
68 | ||
69 | /* Given a pointer to a general register set in /proc format (gregset_t *), | |
70 | unpack the register contents and supply them as gdb's idea of the current | |
71 | register values. */ | |
72 | ||
73 | #ifndef USE_PROC_FS | |
74 | ||
75 | void | |
76 | supply_gregset (gregsetp) | |
77 | gregset_t *gregsetp; | |
78 | { | |
79 | int regi; | |
80 | ||
81 | for (regi = D0_REGNUM ; regi <= SP_REGNUM ; regi++) | |
82 | supply_register (regi, (char *) (*gregsetp + regmap[regi])); | |
83 | supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR)); | |
84 | supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC)); | |
85 | } | |
86 | ||
87 | /* Given a pointer to a floating point register set in /proc format | |
88 | (fpregset_t *), unpack the register contents and supply them as gdb's | |
89 | idea of the current floating point register values. */ | |
90 | ||
91 | void | |
92 | supply_fpregset (fpregsetp) | |
93 | fpregset_t *fpregsetp; | |
94 | { | |
95 | int regi; | |
96 | ||
97 | for (regi = FP0_REGNUM ; regi < FPC_REGNUM ; regi++) | |
98 | supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]); | |
99 | supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]); | |
100 | supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]); | |
101 | supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]); | |
102 | } | |
103 | ||
104 | #endif | |
105 | ||
106 | \f | |
107 | int | |
108 | kernel_u_size () | |
109 | { | |
110 | return (sizeof (struct user)); | |
111 | } | |
112 | \f | |
113 | /* Return non-zero if PC points into the signal trampoline. */ | |
114 | ||
115 | int | |
116 | in_sigtramp (pc) | |
117 | CORE_ADDR pc; | |
118 | { | |
119 | CORE_ADDR sp; | |
120 | char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT]; | |
121 | int insn; | |
122 | ||
123 | sp = read_register (SP_REGNUM); | |
124 | if (pc - 2 < sp) | |
125 | return 0; | |
126 | ||
127 | if (read_memory_nobpt (pc, buf, sizeof (buf))) | |
128 | return 0; | |
129 | insn = extract_unsigned_integer (buf, sizeof (buf)); | |
130 | if (insn == 0xdefc /* addaw #,sp */ | |
131 | || insn == 0x7077 /* moveq #119,d0 */ | |
132 | || insn == 0x4e40 /* trap #0 */ | |
133 | || insn == 0x203c /* movel #,d0 */) | |
134 | return 1; | |
135 | ||
136 | if (read_memory_nobpt (pc - 2, buf, sizeof (buf))) | |
137 | return 0; | |
138 | insn = extract_unsigned_integer (buf, sizeof (buf)); | |
139 | if (insn == 0xdefc /* addaw #,sp */ | |
140 | || insn == 0x7077 /* moveq #119,d0 */ | |
141 | || insn == 0x4e40 /* trap #0 */ | |
142 | || insn == 0x203c /* movel #,d0 */) | |
143 | return 1; | |
144 | ||
145 | return 0; | |
146 | } |