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ppc-linux.c
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1 /*Copyright (C) 2015-2018 Free Software Foundation, Inc.
2
3 This file is part of GDB.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include "common-defs.h"
19 #include "ppc-linux.h"
20 #include <elf.h>
21
22 #ifdef HAVE_GETAUXVAL
23 #include <sys/auxv.h>
24 #endif
25
26 #ifdef __powerpc64__
27
28 /* Get the HWCAP from the process of GDB or GDBserver. If success,
29 save it in *VALP. */
30
31 static void
32 ppc64_host_hwcap (unsigned long *valp)
33 {
34 #ifdef HAVE_GETAUXVAL
35 *valp = getauxval (AT_HWCAP);
36 #else
37 unsigned long data[2];
38 FILE *f = fopen ("/proc/self/auxv", "r");
39
40 if (f == NULL)
41 return;
42
43 while (fread (data, sizeof (data), 1, f) > 0)
44 {
45 if (data[0] == AT_HWCAP)
46 {
47 *valp = data[1];
48 break;
49 }
50 }
51
52 fclose (f);
53 #endif /* HAVE_GETAUXVAL */
54 }
55
56 int
57 ppc64_64bit_inferior_p (long msr)
58 {
59 unsigned long ppc_host_hwcap = 0;
60
61 /* Get host's HWCAP to check whether the machine is Book E. */
62 ppc64_host_hwcap (&ppc_host_hwcap);
63
64 /* We actually have a 64-bit inferior only if the certain bit of the
65 MSR is set. The PowerISA Book III-S MSR is different from the
66 PowerISA Book III-E MSR. The Book III-S MSR is 64 bits wide, and
67 its MSR[SF] is the bit 0 of a 64-bit value. Book III-E MSR is 32
68 bits wide, and its MSR[CM] is the bit 0 of a 32-bit value. */
69 if (ppc_host_hwcap & PPC_FEATURE_BOOKE)
70 return msr & 0x80000000;
71 else
72 return msr < 0;
73 }
74
75 #endif
PPC_FEATURE_BOOKE
#define PPC_FEATURE_BOOKE
Definition: ppc-linux.h:40
common-defs.h
ppc-linux.h