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0a30fbc4 DJ |
1 | /* GNU/Linux/PowerPC specific low level interface, for the remote server for |
2 | GDB. | |
6aba47ca | 3 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007 |
0a30fbc4 DJ |
4 | Free Software Foundation, Inc. |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
6f0f660e EZ |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
0a30fbc4 DJ |
22 | |
23 | #include "server.h" | |
58caa3dc | 24 | #include "linux-low.h" |
0a30fbc4 DJ |
25 | |
26 | #include <asm/ptrace.h> | |
27 | ||
2ec06d2e | 28 | #define ppc_num_regs 71 |
0a30fbc4 DJ |
29 | |
30 | /* Currently, don't check/send MQ. */ | |
2ec06d2e | 31 | static int ppc_regmap[] = |
0a30fbc4 DJ |
32 | {PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4, |
33 | PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4, | |
34 | PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4, | |
35 | PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4, | |
36 | PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4, | |
37 | PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4, | |
38 | PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4, | |
39 | PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4, | |
40 | PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24, | |
41 | PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56, | |
42 | PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88, | |
43 | PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120, | |
44 | PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152, | |
45 | PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184, | |
46 | PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216, | |
47 | PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248, | |
48 | PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4, | |
bc1e36ca | 49 | PT_CTR * 4, PT_XER * 4, PT_FPSCR * 4, }; |
0a30fbc4 | 50 | |
2ec06d2e DJ |
51 | static int |
52 | ppc_cannot_store_register (int regno) | |
0a30fbc4 | 53 | { |
bc1e36ca DJ |
54 | /* Some kernels do not allow us to store fpscr. */ |
55 | if (regno == find_regno ("fpscr")) | |
56 | return 2; | |
57 | ||
0a30fbc4 DJ |
58 | return 0; |
59 | } | |
60 | ||
2ec06d2e DJ |
61 | static int |
62 | ppc_cannot_fetch_register (int regno) | |
0a30fbc4 DJ |
63 | { |
64 | return 0; | |
65 | } | |
66 | ||
0d62e5e8 DJ |
67 | static CORE_ADDR |
68 | ppc_get_pc (void) | |
69 | { | |
70 | unsigned long pc; | |
71 | ||
72 | collect_register_by_name ("pc", &pc); | |
73 | return (CORE_ADDR) pc; | |
74 | } | |
75 | ||
76 | static void | |
77 | ppc_set_pc (CORE_ADDR pc) | |
78 | { | |
79 | unsigned long newpc = pc; | |
80 | ||
81 | supply_register_by_name ("pc", &newpc); | |
82 | } | |
83 | ||
84 | /* Correct in either endianness. Note that this file is | |
85 | for PowerPC only, not PowerPC64. | |
86 | This instruction is "twge r2, r2", which GDB uses as a software | |
87 | breakpoint. */ | |
88 | static const unsigned long ppc_breakpoint = 0x7d821008; | |
89 | #define ppc_breakpoint_len 4 | |
90 | ||
91 | static int | |
92 | ppc_breakpoint_at (CORE_ADDR where) | |
93 | { | |
94 | unsigned long insn; | |
95 | ||
f450004a | 96 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
0d62e5e8 DJ |
97 | if (insn == ppc_breakpoint) |
98 | return 1; | |
99 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
100 | one. */ | |
101 | return 0; | |
102 | } | |
103 | ||
e9d25b98 DJ |
104 | /* Provide only a fill function for the general register set. ps_lgetregs |
105 | will use this for NPTL support. */ | |
106 | ||
107 | static void ppc_fill_gregset (void *buf) | |
108 | { | |
109 | int i; | |
110 | ||
111 | for (i = 0; i < 32; i++) | |
112 | collect_register (i, (char *) buf + ppc_regmap[i]); | |
113 | ||
114 | for (i = 64; i < 70; i++) | |
115 | collect_register (i, (char *) buf + ppc_regmap[i]); | |
116 | } | |
117 | ||
118 | struct regset_info target_regsets[] = { | |
119 | { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL }, | |
120 | { 0, 0, -1, -1, NULL, NULL } | |
121 | }; | |
122 | ||
2ec06d2e DJ |
123 | struct linux_target_ops the_low_target = { |
124 | ppc_num_regs, | |
125 | ppc_regmap, | |
126 | ppc_cannot_fetch_register, | |
127 | ppc_cannot_store_register, | |
0d62e5e8 DJ |
128 | ppc_get_pc, |
129 | ppc_set_pc, | |
f450004a | 130 | (const unsigned char *) &ppc_breakpoint, |
0d62e5e8 DJ |
131 | ppc_breakpoint_len, |
132 | NULL, | |
133 | 0, | |
134 | ppc_breakpoint_at, | |
2ec06d2e | 135 | }; |