1*b725ae77Skettenis /* GNU/Linux/PowerPC specific low level interface, for the remote server for
2*b725ae77Skettenis GDB.
3*b725ae77Skettenis Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
4*b725ae77Skettenis Free Software Foundation, Inc.
5*b725ae77Skettenis
6*b725ae77Skettenis This file is part of GDB.
7*b725ae77Skettenis
8*b725ae77Skettenis This program is free software; you can redistribute it and/or modify
9*b725ae77Skettenis it under the terms of the GNU General Public License as published by
10*b725ae77Skettenis the Free Software Foundation; either version 2 of the License, or
11*b725ae77Skettenis (at your option) any later version.
12*b725ae77Skettenis
13*b725ae77Skettenis This program is distributed in the hope that it will be useful,
14*b725ae77Skettenis but WITHOUT ANY WARRANTY; without even the implied warranty of
15*b725ae77Skettenis MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16*b725ae77Skettenis GNU General Public License for more details.
17*b725ae77Skettenis
18*b725ae77Skettenis You should have received a copy of the GNU General Public License
19*b725ae77Skettenis along with this program; if not, write to the Free Software
20*b725ae77Skettenis Foundation, Inc., 59 Temple Place - Suite 330,
21*b725ae77Skettenis Boston, MA 02111-1307, USA. */
22*b725ae77Skettenis
23*b725ae77Skettenis #include "server.h"
24*b725ae77Skettenis #include "linux-low.h"
25*b725ae77Skettenis
26*b725ae77Skettenis #include <asm/ptrace.h>
27*b725ae77Skettenis
28*b725ae77Skettenis #define ppc_num_regs 71
29*b725ae77Skettenis
30*b725ae77Skettenis /* Currently, don't check/send MQ. */
31*b725ae77Skettenis static int ppc_regmap[] =
32*b725ae77Skettenis {PT_R0 * 4, PT_R1 * 4, PT_R2 * 4, PT_R3 * 4,
33*b725ae77Skettenis PT_R4 * 4, PT_R5 * 4, PT_R6 * 4, PT_R7 * 4,
34*b725ae77Skettenis PT_R8 * 4, PT_R9 * 4, PT_R10 * 4, PT_R11 * 4,
35*b725ae77Skettenis PT_R12 * 4, PT_R13 * 4, PT_R14 * 4, PT_R15 * 4,
36*b725ae77Skettenis PT_R16 * 4, PT_R17 * 4, PT_R18 * 4, PT_R19 * 4,
37*b725ae77Skettenis PT_R20 * 4, PT_R21 * 4, PT_R22 * 4, PT_R23 * 4,
38*b725ae77Skettenis PT_R24 * 4, PT_R25 * 4, PT_R26 * 4, PT_R27 * 4,
39*b725ae77Skettenis PT_R28 * 4, PT_R29 * 4, PT_R30 * 4, PT_R31 * 4,
40*b725ae77Skettenis PT_FPR0*4, PT_FPR0*4 + 8, PT_FPR0*4+16, PT_FPR0*4+24,
41*b725ae77Skettenis PT_FPR0*4+32, PT_FPR0*4+40, PT_FPR0*4+48, PT_FPR0*4+56,
42*b725ae77Skettenis PT_FPR0*4+64, PT_FPR0*4+72, PT_FPR0*4+80, PT_FPR0*4+88,
43*b725ae77Skettenis PT_FPR0*4+96, PT_FPR0*4+104, PT_FPR0*4+112, PT_FPR0*4+120,
44*b725ae77Skettenis PT_FPR0*4+128, PT_FPR0*4+136, PT_FPR0*4+144, PT_FPR0*4+152,
45*b725ae77Skettenis PT_FPR0*4+160, PT_FPR0*4+168, PT_FPR0*4+176, PT_FPR0*4+184,
46*b725ae77Skettenis PT_FPR0*4+192, PT_FPR0*4+200, PT_FPR0*4+208, PT_FPR0*4+216,
47*b725ae77Skettenis PT_FPR0*4+224, PT_FPR0*4+232, PT_FPR0*4+240, PT_FPR0*4+248,
48*b725ae77Skettenis PT_NIP * 4, PT_MSR * 4, PT_CCR * 4, PT_LNK * 4,
49*b725ae77Skettenis PT_CTR * 4, PT_XER * 4, PT_FPSCR * 4, };
50*b725ae77Skettenis
51*b725ae77Skettenis static int
ppc_cannot_store_register(int regno)52*b725ae77Skettenis ppc_cannot_store_register (int regno)
53*b725ae77Skettenis {
54*b725ae77Skettenis /* Some kernels do not allow us to store fpscr. */
55*b725ae77Skettenis if (regno == find_regno ("fpscr"))
56*b725ae77Skettenis return 2;
57*b725ae77Skettenis
58*b725ae77Skettenis return 0;
59*b725ae77Skettenis }
60*b725ae77Skettenis
61*b725ae77Skettenis static int
ppc_cannot_fetch_register(int regno)62*b725ae77Skettenis ppc_cannot_fetch_register (int regno)
63*b725ae77Skettenis {
64*b725ae77Skettenis return 0;
65*b725ae77Skettenis }
66*b725ae77Skettenis
67*b725ae77Skettenis static CORE_ADDR
ppc_get_pc(void)68*b725ae77Skettenis ppc_get_pc (void)
69*b725ae77Skettenis {
70*b725ae77Skettenis unsigned long pc;
71*b725ae77Skettenis
72*b725ae77Skettenis collect_register_by_name ("pc", &pc);
73*b725ae77Skettenis return (CORE_ADDR) pc;
74*b725ae77Skettenis }
75*b725ae77Skettenis
76*b725ae77Skettenis static void
ppc_set_pc(CORE_ADDR pc)77*b725ae77Skettenis ppc_set_pc (CORE_ADDR pc)
78*b725ae77Skettenis {
79*b725ae77Skettenis unsigned long newpc = pc;
80*b725ae77Skettenis
81*b725ae77Skettenis supply_register_by_name ("pc", &newpc);
82*b725ae77Skettenis }
83*b725ae77Skettenis
84*b725ae77Skettenis /* Correct in either endianness. Note that this file is
85*b725ae77Skettenis for PowerPC only, not PowerPC64.
86*b725ae77Skettenis This instruction is "twge r2, r2", which GDB uses as a software
87*b725ae77Skettenis breakpoint. */
88*b725ae77Skettenis static const unsigned long ppc_breakpoint = 0x7d821008;
89*b725ae77Skettenis #define ppc_breakpoint_len 4
90*b725ae77Skettenis
91*b725ae77Skettenis static int
ppc_breakpoint_at(CORE_ADDR where)92*b725ae77Skettenis ppc_breakpoint_at (CORE_ADDR where)
93*b725ae77Skettenis {
94*b725ae77Skettenis unsigned long insn;
95*b725ae77Skettenis
96*b725ae77Skettenis (*the_target->read_memory) (where, (char *) &insn, 4);
97*b725ae77Skettenis if (insn == ppc_breakpoint)
98*b725ae77Skettenis return 1;
99*b725ae77Skettenis /* If necessary, recognize more trap instructions here. GDB only uses the
100*b725ae77Skettenis one. */
101*b725ae77Skettenis return 0;
102*b725ae77Skettenis }
103*b725ae77Skettenis
104*b725ae77Skettenis struct linux_target_ops the_low_target = {
105*b725ae77Skettenis ppc_num_regs,
106*b725ae77Skettenis ppc_regmap,
107*b725ae77Skettenis ppc_cannot_fetch_register,
108*b725ae77Skettenis ppc_cannot_store_register,
109*b725ae77Skettenis ppc_get_pc,
110*b725ae77Skettenis ppc_set_pc,
111*b725ae77Skettenis (const char *) &ppc_breakpoint,
112*b725ae77Skettenis ppc_breakpoint_len,
113*b725ae77Skettenis NULL,
114*b725ae77Skettenis 0,
115*b725ae77Skettenis ppc_breakpoint_at,
116*b725ae77Skettenis };
117