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ppc-linux.c
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1 /*Copyright (C) 2015 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
#define PPC_FEATURE_BOOKE
Definition: ppc-linux.h:40