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cdf43629 YQ |
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 |