1 /* GNU/Linux/PowerPC specific low level interface, for the remote server for
3 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007
4 Free Software Foundation, Inc.
6 This file is part of GDB.
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 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include "linux-low.h"
24 #include <asm/ptrace.h>
26 #define ppc_num_regs 71
28 /* Currently, don't check/send MQ. */
29 static int ppc_regmap[] =
30 {PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4,
31 PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4,
32 PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4,
33 PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4,
34 PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4,
35 PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4,
36 PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4,
37 PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4,
38 PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24,
39 PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56,
40 PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88,
41 PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120,
42 PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152,
43 PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184,
44 PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216,
45 PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248,
46 PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4,
47 PT_CTR * 4, PT_XER * 4, PT_FPSCR * 4, };
50 ppc_cannot_store_register (int regno)
52 /* Some kernels do not allow us to store fpscr. */
53 if (regno == find_regno ("fpscr"))
60 ppc_cannot_fetch_register (int regno)
70 collect_register_by_name ("pc", &pc);
71 return (CORE_ADDR) pc;
75 ppc_set_pc (CORE_ADDR pc)
77 unsigned long newpc = pc;
79 supply_register_by_name ("pc", &newpc);
82 /* Correct in either endianness. Note that this file is
83 for PowerPC only, not PowerPC64.
84 This instruction is "twge r2, r2", which GDB uses as a software
86 static const unsigned long ppc_breakpoint = 0x7d821008;
87 #define ppc_breakpoint_len 4
90 ppc_breakpoint_at (CORE_ADDR where)
94 (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
95 if (insn == ppc_breakpoint)
97 /* If necessary, recognize more trap instructions here. GDB only uses the
102 /* Provide only a fill function for the general register set. ps_lgetregs
103 will use this for NPTL support. */
105 static void ppc_fill_gregset (void *buf)
109 for (i = 0; i < 32; i++)
110 collect_register (i, (char *) buf + ppc_regmap[i]);
112 for (i = 64; i < 70; i++)
113 collect_register (i, (char *) buf + ppc_regmap[i]);
116 struct regset_info target_regsets[] = {
117 { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },
118 { 0, 0, -1, -1, NULL, NULL }
121 struct linux_target_ops the_low_target = {
124 ppc_cannot_fetch_register,
125 ppc_cannot_store_register,
128 (const unsigned char *) &ppc_breakpoint,