1 /* GNU/Linux/PowerPC64 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 /* We use a constant for FPSCR instead of PT_FPSCR, because
29 many shipped PPC64 kernels had the wrong value in ptrace.h. */
30 static int ppc_regmap
[] =
31 {PT_R0
* 8, PT_R1
* 8, PT_R2
* 8, PT_R3
* 8,
32 PT_R4
* 8, PT_R5
* 8, PT_R6
* 8, PT_R7
* 8,
33 PT_R8
* 8, PT_R9
* 8, PT_R10
* 8, PT_R11
* 8,
34 PT_R12
* 8, PT_R13
* 8, PT_R14
* 8, PT_R15
* 8,
35 PT_R16
* 8, PT_R17
* 8, PT_R18
* 8, PT_R19
* 8,
36 PT_R20
* 8, PT_R21
* 8, PT_R22
* 8, PT_R23
* 8,
37 PT_R24
* 8, PT_R25
* 8, PT_R26
* 8, PT_R27
* 8,
38 PT_R28
* 8, PT_R29
* 8, PT_R30
* 8, PT_R31
* 8,
39 PT_FPR0
*8, PT_FPR0
*8 + 8, PT_FPR0
*8+16, PT_FPR0
*8+24,
40 PT_FPR0
*8+32, PT_FPR0
*8+40, PT_FPR0
*8+48, PT_FPR0
*8+56,
41 PT_FPR0
*8+64, PT_FPR0
*8+72, PT_FPR0
*8+80, PT_FPR0
*8+88,
42 PT_FPR0
*8+96, PT_FPR0
*8+104, PT_FPR0
*8+112, PT_FPR0
*8+120,
43 PT_FPR0
*8+128, PT_FPR0
*8+136, PT_FPR0
*8+144, PT_FPR0
*8+152,
44 PT_FPR0
*8+160, PT_FPR0
*8+168, PT_FPR0
*8+176, PT_FPR0
*8+184,
45 PT_FPR0
*8+192, PT_FPR0
*8+200, PT_FPR0
*8+208, PT_FPR0
*8+216,
46 PT_FPR0
*8+224, PT_FPR0
*8+232, PT_FPR0
*8+240, PT_FPR0
*8+248,
47 PT_NIP
* 8, PT_MSR
* 8, PT_CCR
* 8, PT_LNK
* 8,
48 PT_CTR
* 8, PT_XER
* 8, PT_FPR0
*8 + 256 };
51 ppc_cannot_store_register (int regno
)
57 ppc_cannot_fetch_register (int regno
)
67 collect_register_by_name ("pc", &pc
);
68 return (CORE_ADDR
) pc
;
72 ppc_set_pc (CORE_ADDR pc
)
74 unsigned long newpc
= pc
;
76 supply_register_by_name ("pc", &newpc
);
79 /* Correct in either endianness.
80 This instruction is "twge r2, r2", which GDB uses as a software
82 static const unsigned int ppc_breakpoint
= 0x7d821008;
83 #define ppc_breakpoint_len 4
86 ppc_breakpoint_at (CORE_ADDR where
)
90 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
91 if (insn
== ppc_breakpoint
)
93 /* If necessary, recognize more trap instructions here. GDB only uses the
98 /* Provide only a fill function for the general register set. ps_lgetregs
99 will use this for NPTL support. */
101 static void ppc_fill_gregset (void *buf
)
105 for (i
= 0; i
< 32; i
++)
106 collect_register (i
, (char *) buf
+ ppc_regmap
[i
]);
108 for (i
= 64; i
< 70; i
++)
109 collect_register (i
, (char *) buf
+ ppc_regmap
[i
]);
114 #ifndef PTRACE_GETVRREGS
115 #define PTRACE_GETVRREGS 18
116 #define PTRACE_SETVRREGS 19
119 #define SIZEOF_VRREGS 33*16+4
122 ppc_fill_vrregset (void *buf
)
127 base
= find_regno ("vr0");
128 for (i
= 0; i
< 32; i
++)
129 collect_register (base
+ i
, ®set
[i
* 16]);
131 collect_register_by_name ("vscr", ®set
[32 * 16 + 12]);
132 collect_register_by_name ("vrsave", ®set
[33 * 16]);
136 ppc_store_vrregset (const void *buf
)
139 const char *regset
= buf
;
141 base
= find_regno ("vr0");
142 for (i
= 0; i
< 32; i
++)
143 supply_register (base
+ i
, ®set
[i
* 16]);
145 supply_register_by_name ("vscr", ®set
[32 * 16 + 12]);
146 supply_register_by_name ("vrsave", ®set
[33 * 16]);
149 #endif /* __ALTIVEC__ */
151 struct regset_info target_regsets
[] = {
152 /* List the extra register sets before GENERAL_REGS. That way we will
153 fetch them every time, but still fall back to PTRACE_PEEKUSER for the
154 general registers. Some kernels support these, but not the newer
155 PPC_PTRACE_GETREGS. */
157 { PTRACE_GETVRREGS
, PTRACE_SETVRREGS
, SIZEOF_VRREGS
, EXTENDED_REGS
,
158 ppc_fill_vrregset
, ppc_store_vrregset
},
160 { 0, 0, 0, GENERAL_REGS
, ppc_fill_gregset
, NULL
},
161 { 0, 0, -1, -1, NULL
, NULL
}
164 struct linux_target_ops the_low_target
= {
167 ppc_cannot_fetch_register
,
168 ppc_cannot_store_register
,
171 (const unsigned char *) &ppc_breakpoint
,