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[thirdparty/binutils-gdb.git] / gdb / gdbserver / linux-ppc64-low.c
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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
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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
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20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
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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. */
32static 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
52static int
53ppc_cannot_store_register (int regno)
54{
55 return 0;
56}
57
58static int
59ppc_cannot_fetch_register (int regno)
60{
61 return 0;
62}
63
64static CORE_ADDR
65ppc_get_pc (void)
66{
67 unsigned long pc;
68
69 collect_register_by_name ("pc", &pc);
70 return (CORE_ADDR) pc;
71}
72
73static void
74ppc_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. */
84static const unsigned int ppc_breakpoint = 0x7d821008;
85#define ppc_breakpoint_len 4
86
87static int
88ppc_breakpoint_at (CORE_ADDR where)
89{
90 unsigned int insn;
91
f450004a 92 (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
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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
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100/* Provide only a fill function for the general register set. ps_lgetregs
101 will use this for NPTL support. */
102
103static 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
114struct regset_info target_regsets[] = {
115 { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },
116 { 0, 0, -1, -1, NULL, NULL }
117};
118
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119struct 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,
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127 ppc_breakpoint_len,
128 NULL,
129 0,
130 ppc_breakpoint_at,
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131 NULL,
132 NULL,
133 NULL,
134 NULL,
135 1
eee84df1 136};