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eee84df1 DJ |
1 | /* GNU/Linux/PowerPC64 specific low level interface, for the remote server for |
2 | GDB. | |
6aba47ca | 3 | Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007 |
eee84df1 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. */ | |
eee84df1 DJ |
22 | |
23 | #include "server.h" | |
24 | #include "linux-low.h" | |
25 | ||
26 | #include <asm/ptrace.h> | |
27 | ||
28 | #define ppc_num_regs 71 | |
29 | ||
30 | /* We use a constant for FPSCR instead of PT_FPSCR, because | |
31 | many shipped PPC64 kernels had the wrong value in ptrace.h. */ | |
32 | static int ppc_regmap[] = | |
33 | {PT_R0 * 8, PT_R1 * 8, PT_R2 * 8, PT_R3 * 8, | |
34 | PT_R4 * 8, PT_R5 * 8, PT_R6 * 8, PT_R7 * 8, | |
35 | PT_R8 * 8, PT_R9 * 8, PT_R10 * 8, PT_R11 * 8, | |
36 | PT_R12 * 8, PT_R13 * 8, PT_R14 * 8, PT_R15 * 8, | |
37 | PT_R16 * 8, PT_R17 * 8, PT_R18 * 8, PT_R19 * 8, | |
38 | PT_R20 * 8, PT_R21 * 8, PT_R22 * 8, PT_R23 * 8, | |
39 | PT_R24 * 8, PT_R25 * 8, PT_R26 * 8, PT_R27 * 8, | |
40 | PT_R28 * 8, PT_R29 * 8, PT_R30 * 8, PT_R31 * 8, | |
41 | PT_FPR0*8, PT_FPR0*8 + 8, PT_FPR0*8+16, PT_FPR0*8+24, | |
42 | PT_FPR0*8+32, PT_FPR0*8+40, PT_FPR0*8+48, PT_FPR0*8+56, | |
43 | PT_FPR0*8+64, PT_FPR0*8+72, PT_FPR0*8+80, PT_FPR0*8+88, | |
44 | PT_FPR0*8+96, PT_FPR0*8+104, PT_FPR0*8+112, PT_FPR0*8+120, | |
45 | PT_FPR0*8+128, PT_FPR0*8+136, PT_FPR0*8+144, PT_FPR0*8+152, | |
46 | PT_FPR0*8+160, PT_FPR0*8+168, PT_FPR0*8+176, PT_FPR0*8+184, | |
47 | PT_FPR0*8+192, PT_FPR0*8+200, PT_FPR0*8+208, PT_FPR0*8+216, | |
48 | PT_FPR0*8+224, PT_FPR0*8+232, PT_FPR0*8+240, PT_FPR0*8+248, | |
49 | PT_NIP * 8, PT_MSR * 8, PT_CCR * 8, PT_LNK * 8, | |
50 | PT_CTR * 8, PT_XER * 8, PT_FPR0*8 + 256 }; | |
51 | ||
52 | static int | |
53 | ppc_cannot_store_register (int regno) | |
54 | { | |
55 | return 0; | |
56 | } | |
57 | ||
58 | static int | |
59 | ppc_cannot_fetch_register (int regno) | |
60 | { | |
61 | return 0; | |
62 | } | |
63 | ||
64 | static CORE_ADDR | |
65 | ppc_get_pc (void) | |
66 | { | |
67 | unsigned long pc; | |
68 | ||
69 | collect_register_by_name ("pc", &pc); | |
70 | return (CORE_ADDR) pc; | |
71 | } | |
72 | ||
73 | static void | |
74 | ppc_set_pc (CORE_ADDR pc) | |
75 | { | |
76 | unsigned long newpc = pc; | |
77 | ||
78 | supply_register_by_name ("pc", &newpc); | |
79 | } | |
80 | ||
81 | /* Correct in either endianness. | |
82 | This instruction is "twge r2, r2", which GDB uses as a software | |
83 | breakpoint. */ | |
84 | static const unsigned int ppc_breakpoint = 0x7d821008; | |
85 | #define ppc_breakpoint_len 4 | |
86 | ||
87 | static int | |
88 | ppc_breakpoint_at (CORE_ADDR where) | |
89 | { | |
90 | unsigned int insn; | |
91 | ||
f450004a | 92 | (*the_target->read_memory) (where, (unsigned char *) &insn, 4); |
eee84df1 DJ |
93 | if (insn == ppc_breakpoint) |
94 | return 1; | |
95 | /* If necessary, recognize more trap instructions here. GDB only uses the | |
96 | one. */ | |
97 | return 0; | |
98 | } | |
99 | ||
e9d25b98 DJ |
100 | /* Provide only a fill function for the general register set. ps_lgetregs |
101 | will use this for NPTL support. */ | |
102 | ||
103 | static void ppc_fill_gregset (void *buf) | |
104 | { | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < 32; i++) | |
108 | collect_register (i, (char *) buf + ppc_regmap[i]); | |
109 | ||
110 | for (i = 64; i < 70; i++) | |
111 | collect_register (i, (char *) buf + ppc_regmap[i]); | |
112 | } | |
113 | ||
114 | struct regset_info target_regsets[] = { | |
115 | { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL }, | |
116 | { 0, 0, -1, -1, NULL, NULL } | |
117 | }; | |
118 | ||
eee84df1 DJ |
119 | struct linux_target_ops the_low_target = { |
120 | ppc_num_regs, | |
121 | ppc_regmap, | |
122 | ppc_cannot_fetch_register, | |
123 | ppc_cannot_store_register, | |
124 | ppc_get_pc, | |
125 | ppc_set_pc, | |
f450004a | 126 | (const unsigned char *) &ppc_breakpoint, |
eee84df1 DJ |
127 | ppc_breakpoint_len, |
128 | NULL, | |
129 | 0, | |
130 | ppc_breakpoint_at, | |
5a1f5858 DJ |
131 | NULL, |
132 | NULL, | |
133 | NULL, | |
134 | NULL, | |
135 | 1 | |
eee84df1 | 136 | }; |